KR20100108734A - Motor for an electric bicycle - Google Patents

Abstract

PURPOSE: A motor for an electric-powered bicycle is provided to reduce cogging torque and a torque ripple by burying a magnetic piece to the insertion hole of a rotor. CONSTITUTION: A magnetic piece is buried in the outer peripheral part of a rotor(110). A rotary shaft is fixed to the central part of the rotor. A stator(120) stores the rotor. A coil is wound in the stator. The stator is fixed to the inner peripheral part of a carrier. A deceleration gear assembly includes a main gear, a sub gear, and a ring gear. A housing stores the carrier. A pair of shafts(161,162) clinch the carrier on an electric-powered bicycle.

Description

Motor for an electric bicycle

The present invention relates to an electric bicycle motor, and more particularly, to an electric bicycle motor that can increase the torque and reduce noise at the same time compared to the existing motor.

In general, a bicycle, which is a kind of transportation means that a user exerts driving force by applying a rotational force to a rear wheel through a chain by rotating a pedal without a separate external power source. Such a bicycle solves current traffic problems and environmental pollution. Increasingly, the number of users is increasing in that it is an environmentally friendly means of transportation.

However, such a non-motorized bicycle is simply driven by the power exerted from the user's body, and thus has a disadvantage of causing fatigue due to continuous consumption of the user when traveling for a long time or driving on a sloped hill.

That is, the conventional bicycle simply drives depending on the user's physical strength, there is a problem that may not be smooth driving according to the user's physical fitness conditions, and because the continuous power is not provided, it is not suitable for long distance driving.

In order to solve this problem, electric bicycles with electric motors have been developed to travel using electricity that is not harmful to the environment.

However, such a conventional electric bicycle had a problem that the size or volume of the electric motor had to be very large in order to generate sufficient torque to drive the bicycle on which the user rides, and also because the motor uses various levels of reduction gears. There was a problem that a very loud noise from the.

The present invention has been made to solve the above-mentioned problems of the prior art, an object of the present invention to provide a motor for an electric bicycle that can provide a low noise and at the same time provide a high torque for driving a user riding a bicycle. It is.

In order to achieve the above object of the present invention, the present invention is provided with one or more magnet pieces in the outer peripheral portion and the rotating shaft is fixed to the central portion, a cylindrical stator for accommodating the rotor and the coil winding, and the stator on the inner peripheral portion A fixed gear assembly comprising a carrier fixedly installed, a main gear integrally installed on the rotating shaft, and one or more longitudinal gears rotatably coupled to the carrier and a ring gear engaged with the longitudinal gears to rotate the gears; A motor for an electric bicycle can be provided comprising a housing which is coupled to the gear and rotates, and a pair of shafts rotatable about the housing and fixedly coupling the carrier to the electric bicycle.

Here, the main gear, the longitudinal gear and the ring gear of the reduction gear assembly are characterized in that they have a tooth formed in a helical shape so that the noise is reduced.

In addition, the main gear is rotated when the rotor is rotated, the three gears meshed with the main gears are rotatably coupled to the carrier in parallel with each other, and the ring gear is engaged with the three gears in the same direction as the main gears. It is characterized by being rotated to.

In addition, the housing includes a cylindrical body housing for receiving the carrier, an upper housing fixedly coupled to the ring gear to rotate with the ring gear and fixed to the body housing to cover one side of the body housing, and the other side of the body housing. The lower housing is fixedly coupled to the body housing so as to cover.

The pair of shafts may include a first shaft fixed to the carrier through the upper housing and a second shaft fixed to the carrier through the lower housing.

In addition, the carrier, the stator is fixed to the inner circumference is fixed to the upper portion of the carrier to be fixed to the body carrier and the first gear is fixed to the upper shaft to be rotatably supported by the first shaft The carrier and the second shaft is fixed and characterized in that consisting of a lower carrier fixed to the body carrier to cover the lower portion of the body carrier.

In addition, the stator is composed of a plurality of divided cores, each core is characterized in that the coil is wound and then assembled to form a cylindrical stator.

In addition, the rotor is formed by stacking annular disks, the center portion of the laminated rotor is characterized in that the installation hole is installed fixed to the rotation shaft, the outer peripheral portion is characterized in that the insertion hole is inserted one or more magnet pieces are formed.

Here, the magnet pieces have a parallelogram shape, and the insertion hole is formed in a parallelogram shape corresponding to the magnet pieces.

According to the electric bicycle motor of the present invention, it is possible to provide an electric bicycle motor with reduced noise by providing helical shape of teeth of each gear while providing high torque by using reduction gears and ring gears on the first floor. have.

In addition, by dividing the stator of the motor into various pieces of cores, winding the coils on each core, and then combining the cores, the spot ratio of the coil wound on the stator is increased to increase the torque and reduce the size of the motor. You can.

In addition, by forming an inclined parallelogram insertion hole in the rotor and embedding the parallelogram magnet piece in the hole, cogging torque and torque ripple can be reduced to increase the efficiency of the motor.

Hereinafter, an electric bicycle motor according to a preferred embodiment of the present invention with reference to the accompanying drawings will be described in detail.

1 and 2, the electric bicycle motor 100 according to the present embodiment is a rotor 110, a stator 120, a carrier 130, a reduction gear assembly 140, a housing 150 And a pair of shafts 161, 162.

Rotor 110 is a portion that is rotated by an external power source, has a hollow cylindrical shape as a whole, the insertion hole 111 is formed so that at least one magnet piece 112 is provided in the outer peripheral portion and the rotating shaft 113 is fixed to the center portion Is installed. An embodiment of such a rotor 110 is illustrated in FIGS. 3 and 4, and the rotor 110 and the magnet piece 112 will be described with reference to FIGS. 3 and 4.

As shown in FIG. 3, the rotor 110 of the present invention is formed by stacking a plurality of annular disks, and having an installation hole 114 in which a rotating shaft 113 is fixed to a central portion of the stacked rotor 110. Is formed. In addition, an insertion hole 111 into which one or more magnet pieces 112 are inserted is formed in the outer circumferential portion of the rotor 110.

As shown in FIG. 4, the magnet piece 112 of the present invention is inclined to increase driving efficiency of the motor 100, that is, to reduce cogging torque and torque ripple. That is, it is preferable that it is formed in a parallelogram. Correspondingly, the insertion hole 111 formed in the rotor 110 is preferably formed in a parallelogram as shown in FIG. 3.

The stator 120 is wound around a coil (not shown) to form an electric field by an external power source, and is formed in a hollow cylindrical shape to accommodate the rotor 110. Meanwhile, in the exemplary embodiment of the present invention, the stator 120 includes a plurality of cores 121 so as to increase the spot ratio of the coil to further increase torque in the limited space and simultaneously reduce the size of the motor 100. It is preferable to form by dividing.

5 and 6, the stator 120 according to the preferred embodiment of the present invention is formed by dividing the twelve cores 121, and after the coil is wound around each core 121 Each core 121 is assembled to form a cylindrical stator 120. That is, since the coil is wound on the split core 121 and the core 121 is assembled, the spot ratio of the coil wound on the stator 120 may be increased, thereby achieving an effect of increasing torque in a limited space. At the same time, the size of the motor 100 can be reduced.

The carrier 130 is to be fixed to the stator 120, the carrier 130 of the present embodiment is composed of a cylindrical body carrier 131, the upper carrier 132 and the lower carrier 133.

The body carrier 131 accommodates the stator 120 therein, but the stator 120 is fixedly coupled to the inner diameter portion. In addition, three vertical gears 142 are axially coupled to the upper portion of the body carrier 131, and a periodic gear 141 coupled to the rotation shaft 113 of the rotor 110 between the vertical gears 142. Through holes are formed through which the rotation shaft 113 passes. That is, the main gear 141 installed on the rotation shaft 113 of the rotor 110 may be engaged with the three vertical gears 142 through the through hole of the body carrier 131.

The upper carrier 132 rotatably supports three gears 142, but is fixedly installed to the body carrier 131. That is, the upper carrier 132 is preferably installed on the body carrier 131 to cover the upper portion of the vertical gears (142). In addition, the upper carrier 132 is fixedly installed a first shaft 161 for fixing the motor 100 to a vehicle, such as a bicycle.

The lower carrier 133 is installed to be fixed to the body carrier 131 so as to cover the lower portion of the body carrier 131. That is, the lower carrier 133 is installed below the body carrier 131 so as to block the body carrier 131 in which the rotor 110 and the stator 120 are accommodated, and the lower carrier 133 of the rotor 110 A bearing (not shown) for rotatably supporting the rotating shaft 113 may be installed. In addition, the lower carrier 133 is fixed to the second shaft 162 for fixing the motor 100 to a vehicle such as a bicycle fixedly installed.

The reduction gear assembly 140 is to increase the torque of the motor 100 by reducing the rotation speed of the rotation shaft 113 transmitted through the main gear 141 when the rotor 110 rotates. The gear assembly 140 is a ring which is rotated by being engaged with the main gear 141 integrally installed on the rotation shaft 113, three gear gears 142 and three gear gears 142 meshed with the main gear 141. Gear 143. The reduction gear assembly 140 of this embodiment will be described in more detail with reference to FIG. 7.

The main gear 141 is integrally provided at one end of the rotation shaft 113 which rotates together with the rotor 110. That is, the main gear 141 may be manufactured by forming a tooth at the end of the rotation shaft 113 when the rotation shaft 113 is manufactured, but alternatively, a separate sun gear may be fixedly installed at the end of the rotation shaft 113. . The main gear 141 of the present embodiment can improve the problems of high noise, low strength and low efficiency that can occur in a motor using a conventional spur gear by using a helical gear having a helical tooth.

The seed gear 142 is disposed to be engaged with the main gear 141 and is rotatably coupled to the upper portion of the body carrier 131. Three gears 142 of the present embodiment are all provided, but the number of the gears 142 may be freely changed in order to adjust the reduction ratio of the motor 100. In addition, the vertical gear 142 of the present embodiment can improve the problems of high noise, low strength and low efficiency that may occur in a motor using a conventional spur gear by using a helical gear having a helical tooth.

The ring gear 143 is arranged to receive the three seed gears 142 to engage all of the seed gears 142. That is, the ring gear 143 of the present embodiment has a helical tooth formed in its inner diameter so as to be engaged with the vertical gears 142. In addition, the ring gear 143 is coupled to the housing 150, the coupling portion 144 is formed on the outer peripheral portion of the ring gear 143, the coupling portion 144 is a predetermined coupling with the housing 150 A coupling hole 145 into which a coupling pin is inserted to be fixedly coupled by a pin or the like is formed.

As shown in FIG. 7, when the main gear 141 is rotated counterclockwise by the rotation of the rotor 110, three longitudinal gears 142 meshed with the main gear 141 rotate in a clockwise direction. do. The ring gear 143 is rotated counterclockwise by the rotation of the gear 142 as described above. At this time, the torque of the motor 100 is transmitted through the main gear 141, the gear 142 and the ring gear 143. Is increased. The increased torque of the motor 100 is transmitted to the housing 150 fixedly coupled to the ring gear 143 to rotate the housing 150.

The housing 150 is for accommodating the carrier 130 in which the reduction gear assembly 140 is installed, and is fixedly coupled to the ring gear 143 so as to be rotated by the rotational force transmitted through the ring gear 143.

As shown in FIG. 1, the housing 150 of this embodiment includes a cylindrical body housing 151 for receiving the carrier 130, an upper housing 152 and a body housing 151 fixedly coupled to the ring gear 143. It consists of a lower housing 153 covering the other side.

The body housing 151 has a hollow cylindrical shape as a whole and is protected by the rotational force transmitted through the ring gear 143 while protecting the carrier 130 and the reduction gear assembly 140 accommodated therein. Transmit torque to the vehicle.

The upper housing 152 is fixedly coupled to the ring gear 143 and at the same time fixedly coupled to the upper portion of the body housing 151. That is, since the upper housing 152 is fixedly coupled to the ring gear 143, the upper housing 152 is rotated by the rotational force transmitted through the ring gear 143, and the body housing fixedly coupled to the upper housing 152. 151 rotates. In addition, the upper housing 152 has a first shaft hole 154 through which the first shaft 161 penetrates so that the first shaft 161 is coupled to the upper carrier 132.

The lower housing 153 is fixedly coupled to the body housing 151 to cover the other side of the body housing 151, that is, the portion facing the lower carrier 133. In addition, the lower housing 153 has a second shaft hole 155 through which the second shaft 162 penetrates so that the second shaft 162 is coupled to the lower carrier 133.

The pair of shafts 161 and 162 are for fixing the motor 100 to a vehicle such as an electric bicycle to be fixed. The pair of shafts 161 and 162 includes a pair of first and second shafts 161 and 162.

The first shaft 161 is fixedly coupled to the upper carrier 132 through the first shaft hole 154 of the upper housing 152, the second shaft 162 is the second shaft hole of the lower housing 153. It is fixedly coupled to the lower carrier 133 through 155. That is, the carrier 130 is fixed to the bicycle by the first and second shafts 161 and 162.

As mentioned above, although the motor for the electric bicycle of this invention was demonstrated with reference to the preferable embodiment of this invention, it is clear for those skilled in the art that correction, a change, and various modified embodiments are possible without departing from the idea of this invention.

1 is a schematic exploded perspective view of a motor for an electric bicycle according to a preferred embodiment of the present invention;

2 is a schematic cross-sectional view of the motor of FIG. 1;

3 is a schematic perspective view of a rotor provided in the motor of FIG. 1;

4 is a schematic perspective view of the magnet pieces inserted into the rotor of FIG. 3;

5 is a schematic perspective view of a stator provided in the motor of FIG. 1;

6 is a schematic perspective view of the core of FIG. 5; And

7 is a schematic perspective view of a reduction gear assembly provided in the motor of FIG. 1.

<Description of the symbols for the main parts of the drawings>

100: motor 110: rotor

111: insertion hole 112: magnet piece

113: rotating shaft 114: mounting hole

120: stator 121: core

130: carrier 131: body carrier

132: upper carrier 133: lower carrier

140: reduction gear assembly 141: main gear

142: gear 143: ring gear

144: coupling portion 145: coupling hole

150 housing 151 body housing

152: upper housing 153: lower housing

154: first shaft hole 155: second shaft hole

161: first shaft 162: second shaft

Claims (9)

In the motor for an electric bicycle, A rotor having one or more magnet pieces provided at an outer circumference thereof and having a rotating shaft fixed to the central portion thereof; A cylindrical stator accommodating the rotor and having a coil wound thereon; A carrier provided with the stator fixed to an inner circumference thereof; A reduction gear assembly including a main gear installed integrally with the rotation shaft, at least one gear gear meshed with the main gear and rotatably coupled to the carrier, and a ring gear engaged with the at least one gear gear to rotate; A housing accommodating the carrier and rotating in engagement with the ring gear; And And a pair of shafts rotatable with respect to the housing and fixedly coupling the carrier to the electric bicycle. The method according to claim 1, The main gear, the longitudinal gear and the ring gear of the reduction gear assembly have a tooth formed in a helical shape so that noise is reduced. The method according to claim 1 or 2, The main gear is rotated when the rotor is rotated, three gears engaged with the main gear are rotatably coupled to the carrier in parallel with each other, and the ring gear is engaged by receiving the three gears therein. An electric bicycle motor, characterized in that rotated in the same direction as the main gear. The method according to claim 3, The housing, A cylindrical body housing for receiving the carrier; An upper housing fixedly coupled to the ring gear and rotatably coupled with the ring gear and fixedly coupled to the body housing to cover one side of the body housing; And And a lower housing fixedly coupled to the body housing to cover the other side of the body housing. The method according to claim 4, The pair of shafts are first shaft fixedly installed in the carrier through the upper housing; And a second shaft penetrating the lower housing to be fixed to the carrier. The method according to claim 5, The carrier, A body carrier having the stator fixed to an inner circumference thereof and axially coupled to rotate the vertical gears thereon; An upper carrier fixed to an upper portion of the carrier to fix the first shaft and rotatably support the vertical gears; And And a lower carrier fixed to the body carrier such that the second shaft is fixed and covers the lower portion of the body carrier. The method according to claim 3, The stator is composed of a plurality of divided cores, the cores are each assembled after the coil is wound, the electric bicycle motor, characterized in that to form a cylindrical stator. The method according to claim 3, The rotor is formed by stacking annular disks, the center portion of the laminated rotor is formed with the installation hole is fixed to the rotating shaft, the outer peripheral portion is characterized in that the insertion hole is inserted one or more magnet pieces are formed Motor for electric bicycles. The method according to claim 8, The magnet pieces have a parallelogram shape, and the insertion hole is formed in a parallelogram shape corresponding to the magnet pieces.

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