WO2024039021A1 - Motor for laundry dryer with cushion bushing - Google Patents

Motor for laundry dryer with cushion bushing Download PDF

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Publication number
WO2024039021A1
WO2024039021A1 PCT/KR2023/007863 KR2023007863W WO2024039021A1 WO 2024039021 A1 WO2024039021 A1 WO 2024039021A1 KR 2023007863 W KR2023007863 W KR 2023007863W WO 2024039021 A1 WO2024039021 A1 WO 2024039021A1
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WO
WIPO (PCT)
Prior art keywords
bushing
cushion
motor
circumferential surface
cushion member
Prior art date
Application number
PCT/KR2023/007863
Other languages
French (fr)
Inventor
Jeong Cheol Jang
Kyoung Joo Lee
Min Seong Kim
Jun Seok Oh
Original Assignee
New Motech Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by New Motech Co., Ltd. filed Critical New Motech Co., Ltd.
Publication of WO2024039021A1 publication Critical patent/WO2024039021A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/1004—Structural association with clutches, brakes, gears, pulleys or mechanical starters with pulleys
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/02—Domestic laundry dryers having dryer drums rotating about a horizontal axis
    • D06F58/04—Details 
    • D06F58/08—Driving arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
    • H02K5/1732—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at both ends of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations

Definitions

  • the present invention relates to a motor for a laundry dryer with a cushion bushing. More specifically, the present invention relates to a motor for a laundry dryer with a cushion bushing capable of absorbing vibration and impact generated from a driving motor and also preventing a bearing housing from deviating so as to improve the performance of the laundry dryer, by installing a cushion bushing with cushioning in the outer circumference of front end and rear end bearing housings inserted into the front end and rear end of a rotating shaft of the driving motor.
  • clothes dryers for drying clothes dry the clothes by forcibly circulating the hot air generated from a heater into a drum, thereby evaporating moisture contained in the clothes inside the drum.
  • general clothes dryers comprise a safety cover in the upper part of a body which forms the appearance of the clothes dryer, a door installed in one side surface inside the body to put in or take out the clothes, and a drum rotatably installed inside the body to dry objects to be dried such as laundry.
  • the drum is rotatably supported inside the body by a supporter at the front and back.
  • the drum has a cylindrical shape and is connected to a driving motor provided in the lower part of the dryer via a power transmission belt to receive a rotational force.
  • a pulley is provided in one side of the driving motor.
  • the drum is rotatably driven by power transmission of the power transmission belt surrounding the drum through an idler pulley while the power transmission belt is engaged with the pulley.
  • the driving motor rotatably driving the drum is fitted into the supporter connected to the rotating shaft, and a cushion for absorbing vibration and impact delivered from the motor is inserted into the circumference of the rotating shaft which is fitted into the supporter. As the cushion rotates together with the rotating shaft, the cushion may separate from the motor supporter.
  • Korean Patent No. 10-1079885 suggested a motor supporter assembly structure of a dryer.
  • the motor supporter assembly structure of a dryer fits a cushion into the outer circumference of a friction-preventing bushing which is fitted into the through-hole of a rotating shaft so as to prevent a friction force with the cushion by the friction-preventing bushing when the rotating shaft rotates, thereby preventing thermal deformation of the cushion and also absorbing the vibration and impact generated when the rotating shaft rotates through the cushion.
  • the prior art simply assembles the cushion in the outer circumference of the friction-preventing bushing in a press-fit manner. Accordingly, the friction-preventing bushing and the cushion may be separated from each other due to the vibration generated when the motor rotates and thus the cushion may be detached therefrom. When it gets too much, the friction-preventing bushing may fall out from the through-hole of the supporter, thereby greatly reducing reliability of the motor of the dryer.
  • the prior art has the structure where the friction-preventing bushing is fitted into the circumference of the rotating shaft, and the cushion is fitted into the outer circumference of the friction-preventing bushing.
  • the vibration of the supporter may be buffered by the cushion.
  • the performance of the cushion may be greatly reduced. Accordingly, the noise caused by the vibration generated when the rotating shaft rotates cannot be diminished.
  • the present inventors suggest a motor for a laundry dryer with a cushion bushing having a novel structure, in order to solve the above problems.
  • the motor for a laundry dryer with a cushion bushing comprises a rotating shaft 21 of a driving motor 20 which drives a drum 10 of a laundry dryer; a pulley 40 coupled to the front end of the rotating shaft 21, over which a power transmission belt 30 for transmitting a rotational force of the driving motor 20 to the drum 10 is looped; a pulley guide 40A installed in one side of the pulley 40; and front and rear bearing housings 22, 23 surrounding and protecting front and rear bearings 22A, 23A coupled to the front end and rear end of the rotating shaft 21, wherein a cushion bushing 50 is installed in the outer circumferential surface of the end of the front and rear bearing housings 22, 23, the cushion bushing 50 comprising a bushing 51 and a cushion member 52 coupled to the inner circumference of the bushing 51, wherein the inner circumferential surface of the cushion member 52 is installed to contact the outer circumferential surface of the end of the front and rear bearing housings 22, 23.
  • the bushing 51 has screw-shaped concave-convex parts 51B', 51C' in inner circumferential inclined surfaces 51B, 51C which extend to be inclined outwardly in the front and rear of a central part 51A, respectively.
  • the cushion member 52 may have outer circumferential inclined surfaces 52B, 52C which extend to be inclined outwardly in the front and rear of a central part 52A with a hollow portion, respectively, and the inner surface of each of a plurality of protrusions 52D' disposed in the inner circumferential surface of a central fitting hole 52D at predetermined intervals may be installed to contact the outer circumferential surface of the end of the front and end bearing housings 22, 23.
  • adhesive accommodating grooves 51D, 52E may be formed in the inner circumferential surface of the central part 51A of the bushing 51 and the inner circumferential surface of the central part 52A of the cushion member 52, respectively, and the inner surface of the central part 51A of the bushing 51 and the inner surface of the central part 52A of the cushion member 52 may adhere to each other with an adhesive D applied on the adhesive accommodating grooves 51D, 52E in the inner circumferential surface of the central part 51A of the bushing 51 and the inner circumferential surface of the central part 52A of the cushion member 52, respectively.
  • the screw-shaped concave-convex parts 51B', 51C' in the inner circumferential inclined surfaces 51B, 51C of the bushing 51 are coupled to the outer circumferential inclined surfaces 52B, 52C of the cushion member 52 with the adhesive D.
  • screw-shaped concave-convex parts 52B', 52C' corresponding to the screw-shaped concave-convex parts 51B', 51C' in the inner circumferential inclined surfaces 51B, 51C of the bushing 51 may be formed in the outer circumferential inclined surfaces 52B, 52C of the cushion member 52.
  • the present invention installs the cushion bushing in the outer circumferential surface of the end of the front and rear bearing housings to directly absorb the vibration generated when the rotating shaft of the driving motor rotates through the cushion member that contacts the outer circumferential surface of the end of the bearing housing, thereby minimizing the vibration delivered to the bushing of the cushion bushing to improve the stable operation of the drum of the laundry dryer and diminishing the noise delivered to the body of the laundry dryer to improve the performance thereof.
  • the present invention forms the screw-shaped concave-convex parts in the inner circumferential inclined surfaces of the bushing such that the adhesive applied on the screw-shaped concave-convex parts is not exposed outwardly, thereby adhering to the outer circumferential inclined surface of the cushion member while reducing adhesive consumption, and reducing manufacturing costs of the cushion bushing by preventing the waste of the adhesive.
  • the present invention forms the screw-shaped concave-convex parts in the inner circumferential inclined surfaces of the bushing such that the adhesion area is broadened, thereby improving the fixation force with the cushion member and accordingly improving durability.
  • the present invention maintains the stable coupling of the cushion member with the bushing in a firm state, enabling to continuously maintain the performance of absorbing the vibration of the driving motor by avoiding detachment of the cushion member from the bushing despite the vibration generated when the driving motor operates, thereby improving the function of the cushion bushing.
  • Fig. 1 is a perspective view illustrating a laundry dryer in which a motor for a laundry dryer with a cushion bushing according to the present invention is installed;
  • Fig. 2 is a side view illustrating a laundry dryer in which a motor for a laundry dryer with a cushion bushing according to the present invention is installed;
  • Fig. 3 is a perspective view illustrating a motor for a laundry dryer with a cushion bushing according to the present invention
  • Fig. 4 is a perspective view excerpting a cushion bushing of a motor for a laundry dryer with a cushion bushing according to the present invention
  • Fig. 5 is an exploded perspective view illustrating a cushion bushing of a motor for a laundry dryer with a cushion bushing according to the present invention
  • Fig. 6 is an enlarged exploded perspective view illustrating a cushion bushing of a motor for a laundry dryer with a cushion bushing according to the present invention
  • Fig. 7 is a cross-sectional view of a combination of a motor for a laundry dryer with a cushion bushing according to the present invention
  • Fig. 8 is a cross-sectional view excerpting a bushing of a motor for a laundry dryer with a cushion bushing according to the present invention
  • Fig. 9 is a cross-sectional view excerpting a cushion member of a motor for a laundry dryer with a cushion bushing according to the present invention.
  • Fig. 10 is a cross-sectional view according to another embodiment of a bushing and a cushion member of a motor for a laundry dryer with a cushion bushing according to the present invention.
  • Fig. 11 is a view illustrating a combination state of a supporter with a cushion bushing of a motor for a laundry dryer with a cushion bushing according to the present invention.
  • Fig. 11(a) is a combination perspective view
  • Fig. 11(b) is a partial cross-sectional view excerpting the combination.
  • Fig. 1 is a perspective view illustrating a laundry dryer in which a motor for a laundry dryer with a cushion bushing according to the present invention is installed
  • Fig. 2 is a side view illustrating a laundry dryer in which a motor for a laundry dryer with a cushion bushing according to the present invention is installed
  • Fig. 3 is a perspective view illustrating a motor for a laundry dryer with a cushion bushing according to the present invention.
  • a safety cover 110 is provided in the upper part of a dryer main body 100 forming the appearance of the laundry dryer.
  • a door is installed in one side surface of the dryer main body 100 so as to put clothes in therethrough.
  • a drum 10 of the laundry dryer is rotatably installed inside the dryer main body 100 to contain and dry wet clothes.
  • the drum 10 is rotatably supported inside the dryer main body 100.
  • the drum 10 has a cylindrical shape, and is connected to a driving motor 20 provided in the lower part of the laundry dryer via a power transmission belt 30 to receive a rotational force by the rotation of the driving motor 20 and rotate.
  • a pulley guide 40A is installed in one side of a pulley 40 which is screw-coupled to a rotating shaft 21 of the driving motor 20.
  • the drum 10 is rotated by the operation of the power transmission belt 30 surrounding the drum 10 through an idler pulley 40B optionally installed while the power transmission belt 30 is engaged with the pulley 40.
  • F indicates a support frame of the driving motor 20.
  • Fig. 4 is a perspective view excerpting a cushion bushing of a motor for a laundry dryer with a cushion bushing according to the present invention
  • Fig. 5 is an exploded perspective view illustrating a cushion bushing of a motor for a laundry dryer with a cushion bushing according to the present invention
  • Fig. 6 is an enlarged exploded perspective view illustrating a cushion bushing of a motor for a laundry dryer with a cushion bushing according to the present invention
  • Fig. 7 is a cross-sectional view of a combination of a motor for a laundry dryer with a cushion bushing according to the present invention
  • Fig. 4 is a perspective view excerpting a cushion bushing of a motor for a laundry dryer with a cushion bushing according to the present invention
  • Fig. 5 is an exploded perspective view illustrating a cushion bushing of a motor for a laundry dryer with a cushion bushing according to the present invention
  • Fig. 6 is an enlarged exploded perspective view illustrating a cushion bushing of
  • Fig. 8 is a cross-sectional view excerpting a bushing of a motor for a laundry dryer with a cushion bushing according to the present invention
  • Fig. 9 is a cross-sectional view excerpting a cushion member of a motor for a laundry dryer with a cushion bushing according to the present invention.
  • front and rear bearing housings 22, 23 are installed in the outer circumference of front and rear bearings 22A, 23A which are coupled to the front end and rear end of the rotating shaft 21, to safely protect the front and rear bearings 22A, 23A.
  • a cushion bushing 50 is installed in the outer circumferential surface of the end of the front and rear bearing housings 22, 23.
  • the cushion bushing 50 comprising a bushing 51 and a rubber cushion member 52 coupled to the inner circumference of the bushing 51 may be installed such that the inner circumferential surface of the cushion member 52 contacts the outer circumferential surface of the end of the front and rear bearing housings 22, 23.
  • the inner circumferential surface of the cushion member 52 of the cushion bushing 50 can maintain the state of contacting the outer circumferential surface of the end of the front and rear bearing housings 22, 23. Accordingly, the vibration generated when the rotating shaft 21 of the driving motor 20 rotates can be directly absorbed by the cushion member 52 contacting the outer circumferential surface of the end of the bearing housings 22, 23, thereby minimizing the vibration delivered to the bushing 51 of the cushion bushing 50 to improve the stable operation of the drum 10 of the laundry dryer, and diminishing the noise delivered to the dryer main body 100.
  • the bushing 51 has screw-shaped concave-convex parts 51B' and 51C' in inner circumferential inclined surfaces 51B, 51C which extend to be inclined outwardly in the front and rear of a central part 51A with a hollow portion, respectively.
  • the bushing 51 and the cushion member 52 are coupled to each other with an adhesive D by applying the liquid adhesive D between the outer circumferential inclined surfaces 52B, 52C of the cushion member 52, which will be mentioned later, and the screw-shaped concave-convex parts 51B', 51C'.
  • the adhesive D is first applied to the screw-shaped concave-convex parts 51B', 51C'.
  • the adhesive D applied on a plurality of recesses (referring to thread groove) in each of the screw-shaped concave-convex parts 51B', 51C' formed in the inner circumferential inclined surfaces 51B, 51C of the bushing 51 is not exposed outwardly of the bushing 51 due to the recesses of the screw-shaped concave-convex parts 51B', 51C', thereby adhering to the outer circumferential inclined surfaces 52B, 52C of the cushion member 52 while reducing the consumption of the adhesive D, and accordingly reducing manufacturing costs of the cushion bushing 50 by preventing the waste of the adhesive D.
  • the present invention forms the screw-shaped concave-convex parts 51B', 51C' in the inner circumferential inclined surfaces 51B, 51C of the bushing 51 such that the adhesion area is broadened, thereby improving the fixation force with the cushion member 52 and accordingly improving durability.
  • the inner circumferential inclined surfaces 51B, 51C of the bushing 51 may perform a stopper function, by contacting and coupling the outer circumferential inclined surfaces 52B, 52C of the cushion member 52, which will be mentioned later, to the inner circumferential inclined surfaces 51B, 51C which extend to be inclined outwardly in the front and rear of the central part 51A of the bushing 51, respectively, thereby preventing the cushion member 52 from deviating to the front and rear of the bushing 51 due to the vibration generated from the driving motor 20. Accordingly, the circumference of the front and rear ends of the cushion member 52 keeps adhering to the inside of the bushing 51 without protruding outwardly of the front and rear of the bushing 51, and thus the bushing 50 can obtain a clean appearance.
  • the cushion member 52 has outer circumferential inclined surfaces 52B, 52C which extend to be inclined outwardly in the front and rear of a central part 52A with a hollow portion, respectively, and the inner surface of each of a plurality of protrusions 52D' disposed in the inner circumferential surface of a central fitting hole 52D at predetermined intervals may be provided to contact the outer circumferential surface of the end of the front and rear bearing housings 22, 23.
  • the main body of the cushion member 52 made of rubber is elastically fitted into the outer circumferential surface of the end of the front and rear bearing housings 22, 23, the inner surface of each of the protrusions 52D' is elastically and strongly pressed and coupled to the outer circumferential surface of the end of the front and rear bearing housings 22, 23.
  • the cushion member 52 made of rubber absorbs the same.
  • the vibration force delivered to each of the inner surfaces of the outer circumferential inclined surfaces 52B, 52C of the cushion member 52 is dispersed to the inner circumferential inclined surfaces 51B, 51C of the bushing 51, respectively, and the vibration is absorbed by the outer circumferential inclined surfaces 52B, 52C of the cushion member 52, thereby diminishing the noise from the improvement in efficiency of absorbing the vibration.
  • Fig. 10 is a cross-sectional view according to another embodiment of a bushing and a cushion member of a motor for a laundry dryer with a cushion bushing according to the present invention.
  • screw-shaped concave-convex parts 52B', 52C' corresponding to the screw-shaped concave-convex parts 51B', 51C' in the inner circumferential inclined surfaces 51B, 51C of the bushing 51 may be formed in the outer circumferential inclined surfaces 52B, 52C of the cushion member 52.
  • adhesive accommodating grooves 51D, 52E or adhesive accommodating grooves are formed in the inner circumferential surface of the central part 51A of the bushing 51 and the inner circumferential surface of the central part 52A of the cushion member 52, respectively, at predetermined intervals.
  • the inner surface of the central part 51A of the bushing 51 and the inner surface of the central part 52A of the cushion member 52 adhere to each other with the adhesive D applied on the adhesive accommodating grooves 51D, 52E in the inner circumferential surface of the central part 51A of the bushing 51 and the inner circumferential surface of the central part 52A of the cushion member 52, respectively, thereby improving the binding force.
  • Fig. 11 is a view illustrating a combination state of a supporter with a cushion bushing of a motor for a laundry dryer with a cushion bushing according to the present invention.
  • Fig. 11(a) is a combination perspective view
  • Fig. 11(b) is a partial cross-sectional view excerpting the combination.
  • a fitting protrusion 51E and a locking piece 51F which are coupled to a supporter 60 are protrudingly formed in the outer circumference of the bushing 51.
  • the front end of the supporter 60 is fitted to the fitting protrusion 51E, and the locking piece 51F is locked in the rear end locking groove 61 of the supporter 60, so that the cushion member 50 can be coupled to the supporter 60.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

The motor for a laundry dryer with a cushion bushing according to the present invention comprises a rotating shaft (21) of a driving motor (20) which drives a drum (10) of a laundry dryer; a pulley (40) coupled to the front end of the rotating shaft (21), over which a power transmission belt (30) for transmitting a rotational force of the driving motor (20) to the drum (10) is looped; a pulley guide (40A) installed in one side of the pulley (40); and front and rear bearing housings (22, 23) surrounding and protecting front and rear bearings (22A, 23A) coupled to the front end and rear end of the rotating shaft (21), wherein a cushion bushing (50) is installed in the outer circumferential surface of the end of the front and rear bearing housings (22, 23), the cushion bushing (50) comprising a bushing (51) and a cushion member (52) coupled to the inner circumference of the bushing (51), wherein the inner circumferential surface of the cushion member (52) is installed to contact the outer circumferential surface of the end of the front and rear bearing housings (22, 23).

Description

MOTOR FOR LAUNDRY DRYER WITH CUSHION BUSHING
The present invention relates to a motor for a laundry dryer with a cushion bushing. More specifically, the present invention relates to a motor for a laundry dryer with a cushion bushing capable of absorbing vibration and impact generated from a driving motor and also preventing a bearing housing from deviating so as to improve the performance of the laundry dryer, by installing a cushion bushing with cushioning in the outer circumference of front end and rear end bearing housings inserted into the front end and rear end of a rotating shaft of the driving motor.
In general, clothes dryers for drying clothes dry the clothes by forcibly circulating the hot air generated from a heater into a drum, thereby evaporating moisture contained in the clothes inside the drum.
As disclosed in Korean Patent No. 10-1887455, general clothes dryers comprise a safety cover in the upper part of a body which forms the appearance of the clothes dryer, a door installed in one side surface inside the body to put in or take out the clothes, and a drum rotatably installed inside the body to dry objects to be dried such as laundry. The drum is rotatably supported inside the body by a supporter at the front and back.
The drum has a cylindrical shape and is connected to a driving motor provided in the lower part of the dryer via a power transmission belt to receive a rotational force. A pulley is provided in one side of the driving motor. The drum is rotatably driven by power transmission of the power transmission belt surrounding the drum through an idler pulley while the power transmission belt is engaged with the pulley.
The driving motor rotatably driving the drum is fitted into the supporter connected to the rotating shaft, and a cushion for absorbing vibration and impact delivered from the motor is inserted into the circumference of the rotating shaft which is fitted into the supporter. As the cushion rotates together with the rotating shaft, the cushion may separate from the motor supporter.
In order to solve the above problem, Korean Patent No. 10-1079885 suggested a motor supporter assembly structure of a dryer. According to the prior art, the motor supporter assembly structure of a dryer fits a cushion into the outer circumference of a friction-preventing bushing which is fitted into the through-hole of a rotating shaft so as to prevent a friction force with the cushion by the friction-preventing bushing when the rotating shaft rotates, thereby preventing thermal deformation of the cushion and also absorbing the vibration and impact generated when the rotating shaft rotates through the cushion.
Also, the prior art simply assembles the cushion in the outer circumference of the friction-preventing bushing in a press-fit manner. Accordingly, the friction-preventing bushing and the cushion may be separated from each other due to the vibration generated when the motor rotates and thus the cushion may be detached therefrom. When it gets too much, the friction-preventing bushing may fall out from the through-hole of the supporter, thereby greatly reducing reliability of the motor of the dryer.
In particular, the prior art has the structure where the friction-preventing bushing is fitted into the circumference of the rotating shaft, and the cushion is fitted into the outer circumference of the friction-preventing bushing. Thus, the vibration of the supporter may be buffered by the cushion. However, as the vibration generated when the rotating shaft rotates is indirectly delivered to the cushion through the friction-preventing bushing having no cushioning function, the performance of the cushion may be greatly reduced. Accordingly, the noise caused by the vibration generated when the rotating shaft rotates cannot be diminished.
Accordingly, the present inventors suggest a motor for a laundry dryer with a cushion bushing having a novel structure, in order to solve the above problems.
It is an object of the present invention to provide a motor for a laundry dryer with a cushion bushing which firmly couples a cushion member made of rubber to the inner circumference of a bushing installed in the outer circumference of a bearing housing inserted into a rotating shaft of a driving motor without detaching therefrom, and has improved cushioning.
It is another object of the present invention to provide a motor for a laundry dryer with a cushion bushing, allowing an adhesive not to flow down to the outside in an assembly process of bonding the inner circumference of the bushing to the cushion member with the adhesive.
The objects above and other objects inferred therein can be easily achieved by the present invention explained below.
The motor for a laundry dryer with a cushion bushing according to the present invention comprises a rotating shaft 21 of a driving motor 20 which drives a drum 10 of a laundry dryer; a pulley 40 coupled to the front end of the rotating shaft 21, over which a power transmission belt 30 for transmitting a rotational force of the driving motor 20 to the drum 10 is looped; a pulley guide 40A installed in one side of the pulley 40; and front and rear bearing housings 22, 23 surrounding and protecting front and rear bearings 22A, 23A coupled to the front end and rear end of the rotating shaft 21, wherein a cushion bushing 50 is installed in the outer circumferential surface of the end of the front and rear bearing housings 22, 23, the cushion bushing 50 comprising a bushing 51 and a cushion member 52 coupled to the inner circumference of the bushing 51, wherein the inner circumferential surface of the cushion member 52 is installed to contact the outer circumferential surface of the end of the front and rear bearing housings 22, 23.
In the present invention, preferably, the bushing 51 has screw-shaped concave-convex parts 51B', 51C' in inner circumferential inclined surfaces 51B, 51C which extend to be inclined outwardly in the front and rear of a central part 51A, respectively.
In the present invention, the cushion member 52 may have outer circumferential inclined surfaces 52B, 52C which extend to be inclined outwardly in the front and rear of a central part 52A with a hollow portion, respectively, and the inner surface of each of a plurality of protrusions 52D' disposed in the inner circumferential surface of a central fitting hole 52D at predetermined intervals may be installed to contact the outer circumferential surface of the end of the front and end bearing housings 22, 23.
In the present invention, adhesive accommodating grooves 51D, 52E may be formed in the inner circumferential surface of the central part 51A of the bushing 51 and the inner circumferential surface of the central part 52A of the cushion member 52, respectively, and the inner surface of the central part 51A of the bushing 51 and the inner surface of the central part 52A of the cushion member 52 may adhere to each other with an adhesive D applied on the adhesive accommodating grooves 51D, 52E in the inner circumferential surface of the central part 51A of the bushing 51 and the inner circumferential surface of the central part 52A of the cushion member 52, respectively.
In the present invention, preferably, the screw-shaped concave-convex parts 51B', 51C' in the inner circumferential inclined surfaces 51B, 51C of the bushing 51 are coupled to the outer circumferential inclined surfaces 52B, 52C of the cushion member 52 with the adhesive D.
In the present invention, screw-shaped concave-convex parts 52B', 52C' corresponding to the screw-shaped concave-convex parts 51B', 51C' in the inner circumferential inclined surfaces 51B, 51C of the bushing 51 may be formed in the outer circumferential inclined surfaces 52B, 52C of the cushion member 52.
The present invention installs the cushion bushing in the outer circumferential surface of the end of the front and rear bearing housings to directly absorb the vibration generated when the rotating shaft of the driving motor rotates through the cushion member that contacts the outer circumferential surface of the end of the bearing housing, thereby minimizing the vibration delivered to the bushing of the cushion bushing to improve the stable operation of the drum of the laundry dryer and diminishing the noise delivered to the body of the laundry dryer to improve the performance thereof.
Also, the present invention forms the screw-shaped concave-convex parts in the inner circumferential inclined surfaces of the bushing such that the adhesive applied on the screw-shaped concave-convex parts is not exposed outwardly, thereby adhering to the outer circumferential inclined surface of the cushion member while reducing adhesive consumption, and reducing manufacturing costs of the cushion bushing by preventing the waste of the adhesive.
Also, the present invention forms the screw-shaped concave-convex parts in the inner circumferential inclined surfaces of the bushing such that the adhesion area is broadened, thereby improving the fixation force with the cushion member and accordingly improving durability.
Also, the present invention maintains the stable coupling of the cushion member with the bushing in a firm state, enabling to continuously maintain the performance of absorbing the vibration of the driving motor by avoiding detachment of the cushion member from the bushing despite the vibration generated when the driving motor operates, thereby improving the function of the cushion bushing.
Fig. 1 is a perspective view illustrating a laundry dryer in which a motor for a laundry dryer with a cushion bushing according to the present invention is installed;
Fig. 2 is a side view illustrating a laundry dryer in which a motor for a laundry dryer with a cushion bushing according to the present invention is installed;
Fig. 3 is a perspective view illustrating a motor for a laundry dryer with a cushion bushing according to the present invention;
Fig. 4 is a perspective view excerpting a cushion bushing of a motor for a laundry dryer with a cushion bushing according to the present invention;
Fig. 5 is an exploded perspective view illustrating a cushion bushing of a motor for a laundry dryer with a cushion bushing according to the present invention;
Fig. 6 is an enlarged exploded perspective view illustrating a cushion bushing of a motor for a laundry dryer with a cushion bushing according to the present invention;
Fig. 7 is a cross-sectional view of a combination of a motor for a laundry dryer with a cushion bushing according to the present invention;
Fig. 8 is a cross-sectional view excerpting a bushing of a motor for a laundry dryer with a cushion bushing according to the present invention;
Fig. 9 is a cross-sectional view excerpting a cushion member of a motor for a laundry dryer with a cushion bushing according to the present invention;
Fig. 10 is a cross-sectional view according to another embodiment of a bushing and a cushion member of a motor for a laundry dryer with a cushion bushing according to the present invention; and
Fig. 11 is a view illustrating a combination state of a supporter with a cushion bushing of a motor for a laundry dryer with a cushion bushing according to the present invention. Fig. 11(a) is a combination perspective view, and Fig. 11(b) is a partial cross-sectional view excerpting the combination.
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a perspective view illustrating a laundry dryer in which a motor for a laundry dryer with a cushion bushing according to the present invention is installed, Fig. 2 is a side view illustrating a laundry dryer in which a motor for a laundry dryer with a cushion bushing according to the present invention is installed, and Fig. 3 is a perspective view illustrating a motor for a laundry dryer with a cushion bushing according to the present invention.
Referring to Figs. 1 to 3 together, a safety cover 110 is provided in the upper part of a dryer main body 100 forming the appearance of the laundry dryer. A door is installed in one side surface of the dryer main body 100 so as to put clothes in therethrough. A drum 10 of the laundry dryer is rotatably installed inside the dryer main body 100 to contain and dry wet clothes.
The drum 10 is rotatably supported inside the dryer main body 100. The drum 10 has a cylindrical shape, and is connected to a driving motor 20 provided in the lower part of the laundry dryer via a power transmission belt 30 to receive a rotational force by the rotation of the driving motor 20 and rotate. A pulley guide 40A is installed in one side of a pulley 40 which is screw-coupled to a rotating shaft 21 of the driving motor 20. The drum 10 is rotated by the operation of the power transmission belt 30 surrounding the drum 10 through an idler pulley 40B optionally installed while the power transmission belt 30 is engaged with the pulley 40. In the drawings, F indicates a support frame of the driving motor 20.
Fig. 4 is a perspective view excerpting a cushion bushing of a motor for a laundry dryer with a cushion bushing according to the present invention, Fig. 5 is an exploded perspective view illustrating a cushion bushing of a motor for a laundry dryer with a cushion bushing according to the present invention, Fig. 6 is an enlarged exploded perspective view illustrating a cushion bushing of a motor for a laundry dryer with a cushion bushing according to the present invention, Fig. 7 is a cross-sectional view of a combination of a motor for a laundry dryer with a cushion bushing according to the present invention, Fig. 8 is a cross-sectional view excerpting a bushing of a motor for a laundry dryer with a cushion bushing according to the present invention, and Fig. 9 is a cross-sectional view excerpting a cushion member of a motor for a laundry dryer with a cushion bushing according to the present invention.
As illustrated in Figs. 4 to 9, front and rear bearing housings 22, 23 are installed in the outer circumference of front and rear bearings 22A, 23A which are coupled to the front end and rear end of the rotating shaft 21, to safely protect the front and rear bearings 22A, 23A. A cushion bushing 50 is installed in the outer circumferential surface of the end of the front and rear bearing housings 22, 23. The cushion bushing 50 comprising a bushing 51 and a rubber cushion member 52 coupled to the inner circumference of the bushing 51 may be installed such that the inner circumferential surface of the cushion member 52 contacts the outer circumferential surface of the end of the front and rear bearing housings 22, 23.
The inner circumferential surface of the cushion member 52 of the cushion bushing 50 can maintain the state of contacting the outer circumferential surface of the end of the front and rear bearing housings 22, 23. Accordingly, the vibration generated when the rotating shaft 21 of the driving motor 20 rotates can be directly absorbed by the cushion member 52 contacting the outer circumferential surface of the end of the bearing housings 22, 23, thereby minimizing the vibration delivered to the bushing 51 of the cushion bushing 50 to improve the stable operation of the drum 10 of the laundry dryer, and diminishing the noise delivered to the dryer main body 100.
The bushing 51 has screw-shaped concave-convex parts 51B' and 51C' in inner circumferential inclined surfaces 51B, 51C which extend to be inclined outwardly in the front and rear of a central part 51A with a hollow portion, respectively. The bushing 51 and the cushion member 52 are coupled to each other with an adhesive D by applying the liquid adhesive D between the outer circumferential inclined surfaces 52B, 52C of the cushion member 52, which will be mentioned later, and the screw-shaped concave-convex parts 51B', 51C'.
When performing the process of bonding and coupling the outer circumferential inclined surfaces 52B, 52C of the cushion member 52 to the screw-shaped concave-convex parts 51B', 51C' with the adhesive D, the adhesive D is first applied to the screw-shaped concave-convex parts 51B', 51C'. In this case, the adhesive D applied on a plurality of recesses (referring to thread groove) in each of the screw-shaped concave-convex parts 51B', 51C' formed in the inner circumferential inclined surfaces 51B, 51C of the bushing 51 is not exposed outwardly of the bushing 51 due to the recesses of the screw-shaped concave-convex parts 51B', 51C', thereby adhering to the outer circumferential inclined surfaces 52B, 52C of the cushion member 52 while reducing the consumption of the adhesive D, and accordingly reducing manufacturing costs of the cushion bushing 50 by preventing the waste of the adhesive D.
Also, the present invention forms the screw-shaped concave-convex parts 51B', 51C' in the inner circumferential inclined surfaces 51B, 51C of the bushing 51 such that the adhesion area is broadened, thereby improving the fixation force with the cushion member 52 and accordingly improving durability.
Also, the inner circumferential inclined surfaces 51B, 51C of the bushing 51 may perform a stopper function, by contacting and coupling the outer circumferential inclined surfaces 52B, 52C of the cushion member 52, which will be mentioned later, to the inner circumferential inclined surfaces 51B, 51C which extend to be inclined outwardly in the front and rear of the central part 51A of the bushing 51, respectively, thereby preventing the cushion member 52 from deviating to the front and rear of the bushing 51 due to the vibration generated from the driving motor 20. Accordingly, the circumference of the front and rear ends of the cushion member 52 keeps adhering to the inside of the bushing 51 without protruding outwardly of the front and rear of the bushing 51, and thus the bushing 50 can obtain a clean appearance.
The cushion member 52 has outer circumferential inclined surfaces 52B, 52C which extend to be inclined outwardly in the front and rear of a central part 52A with a hollow portion, respectively, and the inner surface of each of a plurality of protrusions 52D' disposed in the inner circumferential surface of a central fitting hole 52D at predetermined intervals may be provided to contact the outer circumferential surface of the end of the front and rear bearing housings 22, 23. When the main body of the cushion member 52 made of rubber is elastically fitted into the outer circumferential surface of the end of the front and rear bearing housings 22, 23, the inner surface of each of the protrusions 52D' is elastically and strongly pressed and coupled to the outer circumferential surface of the end of the front and rear bearing housings 22, 23.
Accordingly, when the vibration generated when the driving motor 20 operates is delivered to the cushion member 52 through the bearing housings 22, 23, the cushion member 52 made of rubber absorbs the same. The vibration force delivered to each of the inner surfaces of the outer circumferential inclined surfaces 52B, 52C of the cushion member 52 is dispersed to the inner circumferential inclined surfaces 51B, 51C of the bushing 51, respectively, and the vibration is absorbed by the outer circumferential inclined surfaces 52B, 52C of the cushion member 52, thereby diminishing the noise from the improvement in efficiency of absorbing the vibration.
Fig. 10 is a cross-sectional view according to another embodiment of a bushing and a cushion member of a motor for a laundry dryer with a cushion bushing according to the present invention.
According to Fig. 10, screw-shaped concave-convex parts 52B', 52C' corresponding to the screw-shaped concave-convex parts 51B', 51C' in the inner circumferential inclined surfaces 51B, 51C of the bushing 51may be formed in the outer circumferential inclined surfaces 52B, 52C of the cushion member 52.
As yet another embodiment, adhesive accommodating grooves 51D, 52E or adhesive accommodating grooves are formed in the inner circumferential surface of the central part 51A of the bushing 51 and the inner circumferential surface of the central part 52A of the cushion member 52, respectively, at predetermined intervals. The inner surface of the central part 51A of the bushing 51 and the inner surface of the central part 52A of the cushion member 52 adhere to each other with the adhesive D applied on the adhesive accommodating grooves 51D, 52E in the inner circumferential surface of the central part 51A of the bushing 51 and the inner circumferential surface of the central part 52A of the cushion member 52, respectively, thereby improving the binding force.
Fig. 11 is a view illustrating a combination state of a supporter with a cushion bushing of a motor for a laundry dryer with a cushion bushing according to the present invention. Fig. 11(a) is a combination perspective view, and Fig. 11(b) is a partial cross-sectional view excerpting the combination.
As illustrated in Fig. 11, in the present invention, a fitting protrusion 51E and a locking piece 51F which are coupled to a supporter 60 are protrudingly formed in the outer circumference of the bushing 51. The front end of the supporter 60 is fitted to the fitting protrusion 51E, and the locking piece 51F is locked in the rear end locking groove 61 of the supporter 60, so that the cushion member 50 can be coupled to the supporter 60.
The detailed description of the present invention described as above simply explains examples for understanding the present invention, but does not intend to limit the scope of the present invention. The scope of the present invention is defined by the accompanying claims. Additionally, it should be construed that simple modifications or changes of the present invention fall within the scope of the present invention.

Claims (6)

  1. A motor for a laundry dryer with a cushion bushing, comprising:
    a rotating shaft 21 of a driving motor 20 which drives a drum 10 of a laundry dryer;
    a pulley 40 coupled to the front end of the rotating shaft 21, over which a power transmission belt 30 for transmitting a rotational force of the driving motor 20 to the drum 10 is looped;
    a pulley guide 40A installed in one side of the pulley 40; and
    front and rear bearing housings 22, 23 surrounding and protecting front and rear bearings 22A, 23A coupled to the front end and rear end of the rotating shaft 21,
    wherein a cushion bushing 50 is installed in the outer circumferential surface of the end of the front and rear bearing housings 22, 23, the cushion bushing 50 comprising a bushing 51 and a cushion member 52 coupled to the inner circumference of the bushing 51, wherein the inner circumferential surface of the cushion member 52 is installed to contact the outer circumferential surface of the end of the front and rear bearing housings 22, 23.
  2. The motor of claim 1, wherein the bushing 51 has screw-shaped concave-convex parts 51B', 51C' in inner circumferential inclined surfaces 51B, 51C which extend to be inclined outwardly in the front and rear of a central part 51A, respectively.
  3. The motor of claim 1, wherein the cushion member 52 has outer circumferential inclined surfaces 52B, 52C which extend to be inclined outwardly in the front and rear of a central part 52A with a hollow portion, respectively, and the inner surface of each of a plurality of protrusions 52D' disposed in the inner circumferential surface of a central fitting hole 52D at predetermined intervals is installed to contact the outer circumferential surface of the end of the front and end bearing housings 22, 23.
  4. The motor of claim 2 or 3, wherein adhesive accommodating grooves 51D, 52E are formed in the inner circumferential surface of the central part 51A of the bushing 51 and the inner circumferential surface of the central part 52A of the cushion member 52, respectively, and the inner surface of the central part 51A of the bushing 51 and the inner surface of the central part 52A of the cushion member 52 adhere to each other with an adhesive D applied on the adhesive accommodating grooves 51D, 52E in the inner circumferential surface of the central part 51A of the bushing 51 and the inner circumferential surface of the central part 52A of the cushion member 52, respectively.
  5. The motor of claim 1, wherein the screw-shaped concave-convex parts 51B', 51C' in the inner circumferential inclined surfaces 51B, 51C of the bushing 51 are coupled to the outer circumferential inclined surfaces 52B, 52C of the cushion member 52 with the adhesive D.
  6. The motor of claim 1, wherein screw-shaped concave-convex parts 52B', 52C' corresponding to the screw-shaped concave-convex parts 51B', 51C' in the inner circumferential inclined surfaces 51B, 51C of the bushing 51 are formed in the outer circumferential inclined surfaces 52B, 52C of the cushion member 52.
PCT/KR2023/007863 2022-08-19 2023-06-08 Motor for laundry dryer with cushion bushing WO2024039021A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2022-0104170 2022-08-19
KR1020220104170A KR20240025943A (en) 2022-08-19 2022-08-19 Motor for laundry dryer with cushion bushing

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WO2024039021A1 true WO2024039021A1 (en) 2024-02-22

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090031995A (en) * 2007-09-26 2009-03-31 니혼 덴산 가부시키가이샤 Motor and disk driving apparatus
KR101920042B1 (en) * 2017-12-01 2018-11-20 계양전기 주식회사 Actuator apparatus with insert bush
KR20200054018A (en) * 2018-11-09 2020-05-19 삼성전자주식회사 Bearing assembly and clothes dryer having the same
KR102164515B1 (en) * 2019-06-26 2020-10-12 뉴모텍(주) Pulley Assembly for Transferring Driving Force of Clothes Dryer
KR20220001701A (en) * 2020-06-30 2022-01-06 뉴모텍(주) BLDC Motor for Laundry Dryer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090031995A (en) * 2007-09-26 2009-03-31 니혼 덴산 가부시키가이샤 Motor and disk driving apparatus
KR101920042B1 (en) * 2017-12-01 2018-11-20 계양전기 주식회사 Actuator apparatus with insert bush
KR20200054018A (en) * 2018-11-09 2020-05-19 삼성전자주식회사 Bearing assembly and clothes dryer having the same
KR102164515B1 (en) * 2019-06-26 2020-10-12 뉴모텍(주) Pulley Assembly for Transferring Driving Force of Clothes Dryer
KR20220001701A (en) * 2020-06-30 2022-01-06 뉴모텍(주) BLDC Motor for Laundry Dryer

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