reference will now be made in detail to the preferred embodiments of the present invention , examples of which are illustrated in the accompanying drawings . hereinafter , preferred embodiments of a motor supporting apparatus of a clothing drier according to the present invention will be explained . fig5 is a sectional view showing a motor supporting apparatus of a clothing drier according to the present invention . the clothing drier according to the present invention , as shown in fig1 , comprises : a drum 102 rotatably mounted in the case 100 for drying clothing ; a circulation duct 104 connected between a front side and a rear side of the drum 102 for supplying heated air to the drum 102 and circulating air which has finished a drying operation in the drum 102 ; a condenser 106 having a cooling fan 118 for removing moisture contained in air exhausted from the drum 102 ; a circulation fan 108 for forcibly circulating air through the circulation duct 104 ; and a motor 120 for driving the cooling fan 118 and the circulation fan 108 and for rotating the drum 102 . the motor 120 is provided with a rotation shaft 130 for driving the cooling fan 118 and the circulation fan 108 at both sides thereof , and a first motor hub 2 and a second motor hub 4 for respectively supporting the rotation shaft 130 are formed at both side surfaces of the motor 120 . the first motor hub 2 and the second motor hub 4 are provided with a motor supporting apparatus , thereby fixing the motor 120 to the case 100 . the motor supporting apparatus is composed of a supporting rib 6 for inserting the first motor hub 2 and supporting , and a supporting member 8 for supporting the second motor hub 4 . the supporting rib 6 is provided with a hub mounting portion 10 of a cylindrical shape for inserting the first motor hub 2 , and is integrally formed at an inner side of the case 100 . the supporting rib 6 is provided with a penetration hole 16 for passing the rotation shaft 130 . a vibration - proof member 18 for minimizing a transmission of vibration generated from the motor 120 to the case 100 is installed between an outer circumferential surface of the first motor hub 2 and an inner circumferential surface of the hub mounting portion 10 . as shown in fig6 and 7 , the supporting member 8 comprises : a body 20 uprightly arranged at a bottom surface of the case 100 ; a hub supporting portion 22 formed at an upper side of the body 20 for inserting the second motor hub 4 and supporting ; and a sliding coupling portion 24 formed at a lower side of the body 20 and sliding - coupled to the case 100 . a bolt coupling portion 26 for bolt - coupling the supporting member 8 to the case 100 after the sliding coupling portion 24 is sliding - inserted into the case 100 is formed at a front side of the body 20 . the bolt coupling portion 26 is integrally formed at a front side of the body 100 as a flat plate shape and has a plurality of bolt coupling holes 28 . accordingly , the bolt coupling portion 26 bolt - couples the supporting member 8 toward a lateral direction of the case 100 after assembling the supporting member 8 to the case 100 . the hub supporting portion 22 is formed as a cylindrical shape to insert the second motor hub 4 , and is provided with a penetration hole 30 for passing the rotation shaft 130 at one side thereof . a vibration - proof member 32 for preventing vibration generated from the motor 120 from being transmitted to the case 100 is installed between an outer circumferential surface of the second motor hub 4 and an inner circumferential surface of the hub supporting portion 22 . also , an engaging portion 36 to which the vibration - proof member 32 is inserted and rotated together is formed at an inner circumferential surface of the hub supporting portion 22 . the sliding coupling portion 24 is formed as a circular arc shape having the same radius r from a center p of the penetration hole 30 in order to be sliding coupled to the case 100 when the body 20 is rotated in a state that the hub supporting portion 22 is inserted into the first motor hub 4 . the sliding coupling portion 24 is provided with an engaging groove 38 of a circular arc shape sliding inserted into the case 100 at both sides thereof , and preferably has a sectional surface of an ‘ i ’ shape . as shown in fig8 , a motor mounting portion 42 for mounting the motor is formed at a bottom surface of the case 100 . the motor mounting portion 42 is provided with the supporting rib 6 having the hub mounting portion 10 at one side thereof and is provided with an insertion groove 40 for inserting the sliding coupling portion 24 at another side thereof . a guide rib 44 having a circular arc shape and the same curvature radius as the sliding coupling portion 24 is formed at both sides of the insertion groove 40 in order to fit the engaging groove 38 of the sliding coupling portion 24 . assembly processes and operation of the motor supporting apparatus of a clothing drier according to the present invention will be explained as follows . fig9 and 10 are perspective views showing a structure that a motor is coupled to the case by the motor supporting apparatus according to the present invention . first , the motor 120 is mounted at the motor mounting portion 42 of the case 100 , and then the first motor hub 2 is inserted into the hub mounting portion 10 of the supporting rib 6 . next , the rotation shaft 130 of the motor 120 is passed through the penetration hole 16 formed at the supporting rib 6 . at this time , said process is performed in a state that the vibration - proof member 18 has been fitted to the outer circumferential surface of the first motor hub 2 . under said state , the rotation shaft 130 is passed through the penetration hole 30 of the supporting member 8 thus to move the supporting member 8 to a lateral direction and insert the hub mounting portion 22 of the supporting member 8 into the second motor hub 4 . said process is also performed in a state that the vibration - proof member 32 has been fitted to the outer circumferential surface of the second motor hub 4 . then , the supporting member 8 is rotated on the basis of the hub mounting portion 22 thus to fit the sliding coupling portion 24 of the supporting member 8 into the insertion groove 40 formed at the bottom surface of the case 100 . according to this , the engaging groove 38 formed at the sliding coupling portion 24 is fitted into the guide rib 44 formed at the insertion groove 40 . next , a bolt is coupled to the bolt coupling portion 26 formed at the supporting member 8 thus to fix the supporting member 8 to the case 100 , thereby completing a motor mounting . a motor disassembling process is performed by disassembling the motor with a reverse order of the motor assembling process . in the motor supporting apparatus of a clothing drier according to the present invention , the first motor hub of the motor is inserted into the supporting rib formed at the case , then the supporting member is inserted into the second motor hub positioned at an opposite side to the motor towards a lateral direction , and then the supporting member is rotated , thereby fixing the supporting member to the case by a sliding method . accordingly , the assembling process is simple . also , since the drum does not have to be disassembled at the time of assembling or disassembling the motor , a service performance and a mass production characteristic are enhanced . as the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof , it should also be understood that the above - described embodiments are not limited by any of the details of the foregoing description , unless otherwise specified , but rather should be construed broadly within its spirit and scope as defined in the appended claims , and therefore all changes and modifications that fall within the metes and bounds of the claims , or equivalence of such metes and bounds are therefore intended to be embraced by the appended claims .