KR101870440B1 - Planetary Gear Train for Transmission of e-bike motor - Google Patents

Abstract

A satellite gear module of a motor-driven transmission for an electric bicycle according to the present invention is characterized in that a stator shaft insertion boss provided with a stator shaft insertion groove provided in a shape corresponding to the stator shaft is inserted into the stator shaft, A first carrier having first gear mounting portions; A second carrier having a second gear mounting portion at a position corresponding to the first gear mounting portion of the first carrier and having a boss insertion hole through which the stator shaft insertion boss is inserted through the center; A plurality of planetary gears interposed between the first and second gear installation portions of the first and second carriers; And a fixing pin rotatably fixing the plurality of satellite gears to the first and second gear mounting portions, respectively.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a planetary gear train for transmission of an e-bike motor,

The present invention relates to a satellite gear module installed in a transmission of a motor for an electric bicycle.

Generally, a bicycle is a vehicle configured to rotate a wheel by a pedaling force. In recent years, an electric bicycle (E-Bike) driven by a motor has been introduced to replace or supplement a workforce. There have been various attempts to arrange the motors, but in recent years, there has been proposed a method of incorporating a motor and a transmission in a hub constituting the front or rear axle.

The hub forms the motor and transmission in one piece.

The hub comprises a hub housing and a fixed shaft. The motor is disposed inside the hub housing, and the fixed shaft is fixed to a front wheel or a rear wheel side of a frame of an electric bicycle or an electric scooter. Thus, the hub housing rotates relative to the fixed shaft to rotate the wheel of the bicycle coupled to the hub housing.

The motor is housed within the hub housing and rotates the rotating shaft by electromagnetic interactions. The motor housing of the motor is fixed to the hub housing. A rotary shaft rotatably disposed at the center of the motor housing transmits rotational force to a sun gear integrally formed at an end of the shaft, To provide power to the transmission. Wherein the transmission is provided with a planetary gear that is engaged with the sun gear, and a ring gear is disposed at a rim of the transmission to engage with the satellite gear to decelerate the rotational force of the rotation shaft, do.

Generally, the four satellite gears are provided as a pair and are rotatably installed on a carrier to form a planetary gear train. The satellite gear module is rotatably mounted on a carrier formed by a body by four bearings each having four bearings, a washer and a fixing pin interposed between the upper and lower portions of the bearing, A stopper is provided on one side of the carrier. Therefore, in order to form a satellite gear module, a total of 22 parts including a carrier, a stopper, four satellite gears, a bearing, a pin and eight washers are required.

However, during the assembling process, there are frequent problems such as loss of the washer during the process of engaging the bearing and the pin with the washer interposed therebetween, and frequent assembling of the washer in a state where the worker accidentally missed the washer. The fixing pin may be disengaged when a deformation due to an external force is generated.

Further, in the case of a carrier formed in one body, there is a problem in that the manufacturing method is complicated, so that the manufacturing cost is high and the manufacturing can not be performed through a relatively inexpensive sintering or die casting process.

The present invention provides a satellite gear module of an electric bicycle motor transmission having an improved structure to reduce the number of parts of the satellite gear module and to reduce the manufacturing cost by diversifying the manufacturing method. There is a purpose.

A satellite gear module of a motor-driven transmission for an electric bicycle according to the present invention is characterized in that a stator shaft insertion boss provided with a stator shaft insertion groove provided in a shape corresponding to the stator shaft is inserted into the stator shaft, A first carrier having first gear mounting portions; A second carrier having a second gear mounting portion at a position corresponding to the first gear mounting portion of the first carrier and having a boss insertion hole through which the stator shaft insertion boss is inserted through the center; A plurality of planetary gears interposed between the first and second gear installation portions of the first and second carriers; And a fixing pin rotatably fixing the plurality of satellite gears to the first and second gear mounting portions, respectively.

According to a preferred embodiment of the present invention, it is preferable that the bearing further comprises a bearing disposed at the center of the plurality of satellite gears, the outer ring being fixed to the center of the satellite gear, and the inner ring being coupled with the fixing pin.

Wherein the first and second gear mounting portions include first and second pin holes each having a diameter corresponding to a diameter of the fixing pin; And first and second support rings protruding from the surface facing the satellite gear and having the first and second pin holes disposed at the center, respectively.

It is preferable that the satellite gear has a bearing inner hole having a diameter corresponding to the outer ring of the bearing at the center.

It is preferable that the inner ring of the bearing has a bearing pin hole having a size corresponding to the diameter of the first and second pin holes to which the fixed pin and the fixed pin are coupled.

It is preferable that the first and second support rings support the inner ring of the bearing.

The first and second carriers are provided in a cross shape in which the four directions are symmetrical. The stator shaft insertion boss and the boss insertion hole are provided at the center, respectively. It is preferable that a total of four satellite gears are rotatably installed.

According to the present invention as described above, it is possible to manufacture a carrier by various manufacturing methods, to reduce the manufacturing cost of parts, and to reduce the number of components required for assembly, thereby reducing the assemblability and component cost.

1 is a side sectional view showing a general structure of an electric bicycle motor according to the present invention,
Fig. 2 is a perspective view showing the planetary gear train of Fig. 1,
3 is an exploded perspective view showing a planetary gear module of an electric bicycle motor vehicle transmission according to a preferred embodiment of the present invention,
4 is a sectional view taken along the line AA in Fig.

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

1 is a sectional view showing a motor of an electric bicycle according to the present invention.

As shown, the motor of the electric bicycle according to the present invention includes a hub housing 11, a motor 20, and a transmission 30.

The hub housing 11 is provided in a substantially cylindrical shape and disposed on the wheel central axis of the front wheel or the rear wheel of the bicycle. A bike wheel member (not shown) may be disposed on the outer circumferential surface of the hub housing 11 or may be coupled to a hub housing mount groove formed on the inner wheel side of the bicycle wheel. Meanwhile, a fixing shaft 22 is installed at the center of the hub housing 11. The fixed shaft 22 is fixed to the front or rear wheel side of the frame of the electric bicycle or the electric scooter. Thus, the hub housing 11 rotates relative to the fixed shaft 22 to rotate the wheel of the bicycle coupled to the hub housing 11. [

The motor 20 is installed in the hub housing 11 so as to be concentric with the stationary shaft 22. The motor 20 includes a rotor 21a and a stator 21b. A rotary shaft 21c is installed at the center of the rotor 21a. The rotation shaft 21c is installed so as to be concentric with the fixed shaft 22, and a sun gear 30 is installed at an end thereof.

The rotation of the sun gear 30 due to the interaction between the rotor 21a and the stator 21b installed in the motor housing 21 is received from the rotary shaft 21c and rotated.

The first satellite gear 40 meshes with the sun gear 30 and rotates in conjunction with the rotation of the sun gear 30. At least three of the first satellite gears 40 are provided, and a first ring gear 50 is engaged with the outer periphery of the first satellite gears 40. The first ring gear (50) rotates in conjunction with the rotation of the first satellite gears (40). The second ring gear 60 is disposed on the outer peripheral side of the first ring gear 50 and the hub cover 12 constituting the outer surface of one end of the hub housing 11, And rotate together.

A connecting member is interposed between the first ring gear 50 and the second ring gear 60 to directly transmit or interrupt the rotational force according to the rotational direction. For example, when the rotational shaft is rotated in one direction, The rotation of the gear 50 is directly transmitted to the second ring gear 60 by the connecting member to rotate the housing by rotating the hub cover 12 fastened to the second ring gear 60.

On the other hand, when the rotary shaft is rotated in the other direction, the direct transmission of the rotational force of the first ring gear (50) to the second ring gear (60) is interrupted, And the second ring gear 60 is rotated in one direction.

The satellite gear module 100 includes first and second carriers 110 and 120, second satellite gears 130, and a fixed pin 140.

The first carrier 110 is formed in a substantially plate-like plate shape, and is preferably provided in a cross shape having four symmetrical directions as shown in Figs. 2 and 3. A first gear mounting portion 115 for mounting the second satellite gear 130 is provided at each of the protruding ends for mounting four second satellite gears 130.

A stator shaft insertion boss 112 having a stator shaft insertion groove 111 having a shape corresponding to the diameter of the stator shaft 101 is formed at the center of the first carrier 110 so that the stator shaft 101 can be coupled thereto. Is protruded. A plurality of non-slip ribs 160 are formed on the inner circumferential surface of the stator shaft insertion groove 111 in a direction parallel to the insertion direction so as to support the stator shaft 101 in a fixed position.

The first gear installation part 115 is formed at an end of the first carrier 110 and is rotatably arranged with the second satellite gear 130. The second gear support part 115 rotates the second satellite gear 130 A first pin hole 113 into which a fixing pin 140 for fixing / supporting is inserted and inserted and a first support ring 114 having a center at the first pin hole 113 and protruding at a predetermined height . The first support ring 114 plays the same role as a conventional washer member and preferably supports the inner ring 152 of the bearing 150 coupled to the second satellite gear 130 .

The second carrier 120 is formed in a substantially plate-like plate shape. Preferably, the second carrier 120 is provided with a cross shape that is symmetrical in four directions as shown in FIGS. The first and second gears 130 and 130 are installed on the first carrier 110 and the second carrier 110, respectively, (Not shown).

A boss insertion hole 122 into which the stator shaft insertion boss 112 to which the stator shaft 101 is coupled is fitted at the center of the second carrier 120.

The second gear installation part 125 is formed at the end of the second carrier 120 and is rotatably disposed at the second satellite gear 130. The second gear support part 125 rotates the second satellite gear 130 And a second support ring 124 having a center at the second pin hole 123 and protruding at a predetermined height from the center of the second pin hole 123, . The second support ring 124 plays the same role as a conventional washer member and preferably supports the inner ring 152 of the bearing 150 coupled to the second satellite gear 130 .

The second satellite gear 130 is rotatably installed on the first and second gear mounting portions 115 and 125 provided on the first and second carriers 110 and 120, respectively. The second planet gear 130 is engaged with the second planet ring gear 60 to control the rotation of the second planet ring gear 60.

A gear tooth 131 is formed on an outer circumferential surface of the second satellite gear 130 and a bearing inner circumferential surface of the second satellite gear 130 is coupled with a bearing inner circumferential surface 152 of the bearing 150, . The diameter of the bearing bore 152 is formed to be equal to the diameter of the outer ring 151 of the bearing 151.

The bearing 150 is for minimizing the frictional force generated when the second planetary gear 130 rotates and includes an outer ring 151 and an inner ring 152. The outer ring 151 and the inner ring 152, So that relative rotation between the outer ring 151 and the inner ring 152 can be smoothly performed. A bearing pin hole 153 having a diameter corresponding to the diameter of the fixing pin 140 is provided at the center of the inner ring 152. In the present invention, the bearing 150 is a ball bearing. However, the present invention is not limited thereto, and other types of bearings such as air bearings and magnetic bearings may be used as needed.

The fixing pin 140 includes first and second pin holes 113 formed in the first and second gear mounting portions 115 and 125 provided in the first and second carriers 110 and 120, And is inserted and coupled from the inside to the outside of the casing 123. As shown in FIG. 4, first and second pin holes 113 and 123 having a smaller diameter than the first and second pin holes 113 and 123 are formed at the ends of the first and second pin holes 113 and 123, respectively. Two through holes 116 and 126 are formed so that the fixing pin 140 can not pass through the first and second pin holes 113 and 123. [ Therefore, even if a separate stopper is not provided, the fixing pin 140 interposed between the first and second carriers 110 and 120 is not likely to be released in the axial direction.

The fixing pin 140 is inserted through a bearing pin hole 153 formed at the center of the inner ring 152 of the bearing 150 to rotatably support and fix the second satellite gear 130, The first and second carriers 110 and 120 are fixed while both ends are coupled with the first and second pin holes 113 and 123. In order to insert both ends of the fixing pin 140 into the first and second carriers 110 and 120 as described above, it is necessary to carry out a press-fit process to perform forced press-fitting.

That is, the satellite gear module 100 according to the present invention includes the first and second carriers 110 and 120, the second satellite gear 130 and the fixing pin 140 on which the bearing 150 is mounted, Are arranged at respective assembling positions. The bearing 150 is press-fitted into the center of the second satellite gear 130 and coupled with the bearing pin hole 153 formed at the center of the inner ring 152 of the bearing 150 The second planet gears 130 in which the fixing pins 140 are inserted into the four bearing pin holes 153 are inserted into the first and second gear mounting portions 115 and 115 of the first and second carriers 110 and 120, And then both ends of the fixing pin 140 are press-fitted into the first and second carriers 110 and 120 from the inside toward the outside, respectively.

According to such a configuration, the carrier, which has conventionally been formed of one body, can be produced by various methods such as die casting and sintering, and since complicated post-processing is not required after production, .

In the related art, two washer members are required per one second satellite gear 130, but according to the present invention, the role of such a washer member is not limited to that of the first and second carriers 110 and 120, Since the first and second support rings 114 and 124 formed integrally with the second gear coupling portions 115 and 125 support the inner ring 152 of the bearing 150, The washer member used can be omitted.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the true scope of the present invention should be determined by the following claims.

11; Hub housing 20; motor
21; Motor housing 22; Fixed shaft
30; A sun gear 40; The first satellite gear
50; A first ring gear 60; The second ring gear
100; A satellite gear module 101; Stator shaft
110; A first carrier 112; Stator shaft insertion boss
113; A first pinhole 114; The first support ring
115; A first gear installing portion 116; The first through hole
120; A second carrier 122; Boss insertion hole
123; A second pin hole 124; Second support ring
125; A second gear installing portion 126; Second through hole
130; A second satellite gear 140; Fixing pin
150; A bearing 151; paddle
152; Inner ring

Claims (13)

A first carrier including a stator shaft insertion boss to which a stator shaft is coupled and at least three or more first pin holes spaced apart from the stator shaft insertion boss;
A second carrier coupled to the first carrier and including at least three or more second pin holes disposed at positions corresponding to the at least three first pin holes;
At least three or more satellite gears disposed between the first carrier and the second carrier;
At least three fixing pins having one end coupled to the first pinhole and the other end coupled to the second pinhole; And
And at least three or more bearings disposed between the satellite gear and the fixed pin,
Wherein the first carrier includes a first surface facing the second carrier, and a first surface of the first carrier protruding from the first surface of the first carrier toward the second carrier, The support ring is disposed, the first pin hole is disposed on the inner peripheral surface of the first support ring,
The second carrier includes a second surface opposite to the first carrier and the second surface of the second carrier is provided with a second surface extending from the second surface of the second carrier toward the first carrier, The support ring is disposed, the second pin hole is arranged on the inner circumferential surface of the second support ring,
The diameter of the inner peripheral surface of the first and second support rings corresponds to the diameter of the one end and the other end of the fixed pin,
Wherein the first and second carriers are respectively formed with first and second through holes connected to the first and second pin holes and having diameters smaller than the diameters of the first and second pin holes,
Wherein the stator shaft insertion boss is disposed at the center of the carrier, the pin holes and the satellite gears are spaced apart from each other at equal intervals on a circumference of the stator shaft insertion boss,
And a plurality of anti-slip ribs extending in the axial direction of the stator shaft are disposed on an inner circumferential surface of the stator shaft insertion boss. The method according to claim 1,
Wherein an outer ring of the bearing is fixed to the satellite gear, and an inner ring of the bearing is coupled to the fixed pin. delete The method according to claim 1,
And the diameter of the inner peripheral surface of the second support ring is the same as the diameter of the other end of the fixing pin. The method according to claim 1,
The bearing includes a third surface facing the first surface of the first carrier and a fourth surface facing the second surface of the second carrier,
The satellite gear includes a fifth surface facing the first surface of the first carrier and a sixth surface facing the second surface of the second carrier,
Wherein the distance between said fifth and sixth surfaces of said satellite gear is at least in part greater than the distance between said third surface and said fourth surface of said bearing. The method according to claim 1,
And the first support ring and the second support ring support the inner ring of the bearing. The method according to claim 1,
Wherein the pinhole and the satellite gear are disposed so as to have an interval of 120 degrees or 90 degrees circumferentially about the stator shaft insertion boss, respectively. The method according to claim 1,
The first support ring includes a seventh surface facing the bearing,
And the seventh face of the first support ring is in contact with the bearing. The method according to claim 1,
And the second support ring includes an eighth surface facing the bearing,
And the eighth surface of the second support ring is in contact with the bearing. The method according to claim 1,
Wherein a length of the second support ring protruding from the second surface of the second carrier is equal to a distance between the second surface of the second carrier and the bearing. delete A hub housing, a motor disposed in the hub housing, and a satellite gear module interlocked with the motor,
The satellite gear module
A first carrier including a stator shaft insertion boss to which a stator shaft is coupled and at least three or more first pin holes spaced apart from the stator shaft insertion boss;
A second carrier coupled to the first carrier and including at least three or more second pin holes disposed at positions corresponding to the at least three first pin holes;
At least three or more satellite gears disposed between the first carrier and the second carrier;
At least three fixing pins having one end coupled to the first pinhole and the other end coupled to the second pinhole; And
And at least three or more bearings disposed between the satellite gear and the fixed pin,
Wherein the first carrier includes a first surface facing the second carrier, and a first surface of the first carrier protruding from the first surface of the first carrier toward the second carrier, The support ring is disposed, the first pin hole is disposed on the inner peripheral surface of the first support ring,
The second carrier includes a second surface opposite to the first carrier and the second surface of the second carrier is provided with a second surface extending from the second surface of the second carrier toward the first carrier, The support ring is disposed, the second pin hole is arranged on the inner circumferential surface of the second support ring,
The diameter of the inner peripheral surface of the first and second support rings corresponds to the diameter of the one end and the other end of the fixed pin,
Wherein the first and second carriers are respectively formed with first and second through holes connected to the first and second pin holes and having diameters smaller than the diameters of the first and second pin holes,
Wherein the stator shaft insertion boss is disposed at the center of the carrier, the pin holes and the satellite gears are spaced apart from each other at equal intervals on a circumference of the stator shaft insertion boss,
And a plurality of anti-slip ribs extending in the axial direction of the stator shaft are disposed on an inner circumferential surface of the stator shaft insertion boss. A bicycle comprising: a bicycle wheel; a hub housing coupled to an inner ring of the bicycle wheel; a motor disposed in the hub housing; and a satellite gear module interlocked with the motor,
The satellite gear module
A first carrier including a stator shaft insertion boss to which a stator shaft is coupled and at least three or more first pin holes spaced apart from the stator shaft insertion boss;
A second carrier coupled to the first carrier and including at least three or more second pin holes disposed at positions corresponding to the at least three first pin holes;
At least three or more satellite gears disposed between the first carrier and the second carrier;
At least three fixing pins having one end coupled to the first pinhole and the other end coupled to the second pinhole; And
And at least three or more bearings disposed between the satellite gear and the fixed pin,
Wherein the first carrier includes a first surface facing the second carrier, and a first surface of the first carrier protruding from the first surface of the first carrier toward the second carrier, The support ring is disposed, the first pin hole is disposed on the inner peripheral surface of the first support ring,
The second carrier includes a second surface opposite to the first carrier and the second surface of the second carrier is provided with a second surface extending from the second surface of the second carrier toward the first carrier, The support ring is disposed, the second pin hole is arranged on the inner circumferential surface of the second support ring,
The diameter of the inner peripheral surface of the first and second support rings corresponds to the diameter of the one end and the other end of the fixed pin,
Wherein the first and second carriers are respectively formed with first and second through holes connected to the first and second pin holes and having diameters smaller than the diameters of the first and second pin holes,
Wherein the stator shaft insertion boss is disposed at the center of the carrier, the pin holes and the satellite gears are spaced apart from each other at equal intervals on a circumference of the stator shaft insertion boss,
And a plurality of anti-slip ribs extending in the axial direction of the stator shaft are disposed on an inner circumferential surface of the stator shaft insertion boss.

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