KR20170121519A - Reducer for active stabilizer - Google Patents

Abstract

The present invention relates to a reducer for an active stabilizer system of a vehicle. The present invention realizes the reducer by using planetary gear sets (50, 60, 70) of three stages in order to have larger output torque and an increased reduction ratio as compared to input torque and enables a ball bearing and a thrust bearing to be installed in a position requiring a support force with respect to rotation and a position where a thrust is generated to reduce a noise and a vibration and increase efficiency of the reducer and increase durability.

Description

[0001] DESCRIPTION [0002] REDUCER FOR ACTIVE STABILIZER FOR AUTOMOTIVE STABILIZER SYSTEM [

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed reducer for an active stabilizer system of a vehicle, and more particularly to a speed reducer for an active stabilizer system of a vehicle having a compact structure capable of realizing high output torque, high reduction ratio, low vibration and low noise.

The stabilizer system of the vehicle is a system for suppressing the roll of the vehicle body when turning the vehicle by utilizing the rigidity of the stabilizer bar.

In recent years, an active stabilizer system has been developed in which the roll-restraining moment against the roll moment received by the vehicle body is exerted on the stabilizer bar in response to the turning state of the vehicle, thereby changing the rigidity of the stabilizer bar and appropriately controlling the roll angle of the vehicle body .

The conventional active stabilizer system has a drawback in that it requires a complicated hydraulic pipeline to be constructed of a hydraulic type, weight of the vehicle is increased due to its heavy weight, As the power is transmitted through the hydraulic path, the responsiveness is low, the efficiency is low, and the unit price is high.

To overcome the above disadvantages, a technique has been developed in which a speed reducer using a planetary gear set is connected to a stabilizer bar.

However, in the gear reducer for a stabilizer system using a conventional planetary gear set, most of the planetary gear sets of the single-stage planetary gear set have a configuration in which the output torque and the high reduction ratio are difficult to implement. It is difficult to effectively control the roll load generated at the time of turning.

In particular, in recent years, development of high performance vehicles that are superior in performance to existing vehicles is gradually increasing in various parts such as driving performance, safety performance, durability performance, and noise vibration, and in such high performance vehicles, It is desirable that the speed reducer capable of realizing the output torque and the high reduction ratio can be implemented in the stabilizer system.

In addition, vibrations and noise are generated due to driving of the rotating body such as gears and shafts. Such vibration and noise are caused by the frictional force between the adjacent components and the supporting structure of the rotating body when the rotating body is driven As the size is determined, if the vibration and noise are large, the efficiency of the reducer is lowered, the durability of the reducer is reduced, and furthermore, the riding feeling is reduced when the vehicle is applied.

Therefore, when designing a speed reducer that realizes a high output torque and a high reduction ratio using the planetary gear set, it is desirable to have a low friction structure, a low vibration and a low noise structure.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as an admission that the prior art is known to those skilled in the art.

Korean Patent Publication No. 10-2009-0046488

The present invention relates to a speed reducer for an active stabilizer system in which a speed reducer composed of a three-stage planetary gear set is applied to a stabilizer bar, which realizes a high output torque and a high reduction ratio to the input torque, In particular, when the rotating body is driven, the frictional force between the adjacent components is minimized, and the rotating body is firmly supported, thereby reducing the vibration and noise, thereby increasing the efficiency of the reducer and improving the durability It has its purpose.

In order to achieve the above object, a speed reducer for an active stabilizer system of a vehicle of the present invention includes a first stage planetary gear set, a second stage planetary gear set, and a third stage planetary gear set directly coupled to each other in a coaxial manner, The two-stage ring gear and the three-stage ring gear are constrained to rotate with each other; The stabilizer bar of one side is connected to the case of the motor and the stabilizer bar of the other side is connected to the three-stage carrier serving as the output shaft; The motor shaft is connected to the first stage sun gear as the input shaft, the first stage carrier is connected to the second stage sun gear, the second stage carrier is connected to the third stage sun gear; Wherein the one-stage ring gear, the two-stage ring gear, and the three-stage ring gear are formed integrally with an inner diameter of a ring gear housing separately made from the reduction gear housing; And a ring gear housing is inserted into the reduction gear housing and is integrally coupled to the reduction gear housing.

Wherein the gears constituting the one-stage planetary gear set are constituted by helical gears; And the gears constituting the two-stage planetary gear set and the three-stage planetary gear set are constituted by spur gears.

In a state where the ring gear housing formed with the one-stage ring gear, the two-stage ring gear and the three-stage ring gear is coupled to the reduction gear housing, the one-stage ring gear is provided with a single- Assemblies are combined to form a single stage planetary gear set; The two-stage ring gear and the three-stage ring gear are combined with an assembly of a two-stage sun gear, a two-stage planetary gear and a two-stage carrier formed of spur gears respectively, and an assembly of a three- And a planetary gear set and a three-stage planetary gear set.

A first ball bearing that supports the first-stage carrier in the rotational direction and the thrust in the direction of the input shaft, wherein the first-stage carrier is assembled with the inner ring and the outer ring is assembled to the reducer housing; A second ball bearing which supports the first-stage carrier and the second-stage carrier in the rotational direction and the thrust in the direction of the input shaft, in which the outer ring is assembled to the one-stage carrier and the inner ring is assembled to the two- A third ball bearing supporting the two-stage carrier in the rotational direction and supporting the thrust in the direction of the output shaft, wherein the inner ring is assembled to the two-stage carrier and the outer ring is assembled to the three- And a fourth ball bearing supporting the three-stage carrier in the rotational direction and supporting the thrust in the direction of the output shaft, in which the inner ring is assembled to the three-stage carrier and the outer ring is assembled to the ring gear housing.

And a thrust bearing provided between the one-stage carrier and the two-stage carrier to reduce the frictional force with the two-stage carrier by the thrust of the one-stage carrier.

Wherein the thrust bearing supports the thrust in the direction of the output shaft together with the second ball bearing when the thrust in the direction of the output shaft generated in the first stage planetary gear set is larger than the bearing force of the second ball bearing and reduces the frictional force between the first stage carrier and the second stage carrier .

And a snap ring fixed to the three-stage carrier and supporting one side of the fourth ball bearing to prevent disengagement of the fourth ball bearing.

A wave washer installed to be supported on one side of the outer ring of the fourth ball bearing; And a washer cover that adjusts the axial clearance of the entire speed reducer by adjusting the width of the wave washer by applying a preload to the wave washer while being assembled in the speed reducer housing.

The washer cover is assembled to the reducer housing in a threaded manner and is installed to be movable in the direction of the input shaft and the direction of the output shaft according to the rotation direction.

According to the present invention, a reduction gear is implemented using a three-stage planetary gear set. As a result, it is possible to realize a high output torque and a high reduction ratio as compared with an input torque, thereby realizing a reduction gear having high efficiency and high responsiveness There is an effect that the roll load generated when the vehicle turns can be effectively controlled.

In the present invention, in implementing a speed reducer using a three-stage planetary gear set, the first-stage carrier and the second-stage sun gear are directly connected, and the second-stage carrier and the third- The planetary gear set having a structure directly coaxial with the planetary gear set to have a compact size along the longitudinal direction of the stabilizer bar.

In addition, the first stage carrier and the second stage carrier serve as the output shafts of the first stage planetary gear set and the second stage planetary gear set, respectively, and simultaneously serve as the input shafts of the second stage planetary gear set and the third stage planetary gear set , It is possible to reduce the number of parts, reduce weight and cost, and further reduce the size of the entire reducer.

The reduction gear of the present invention is advantageous in that the overall size of the reducer is compact because the overall outer size of the one-stage planetary gear set, the two-stage planetary gear set, and the three- Since the gear module value is configured to increase from the gear set to the three-stage planetary gear set, the strength and durability of the gear teeth constituting the three-stage planetary gear set are improved, and the effect have.

In addition, the first-stage ring gear, the second-stage ring gear, and the third-stage ring gear are integrally formed on the inner diameter of a ring gear housing made separately from the reduction gear housing, and the ring gear housing is inserted into the reduction gear housing, The combined structure facilitates the dimensional control by assembling the parts between the parts, and further enhances the assembly precision such as axial alignment.

In addition, the inner diameters of the first ring gear, the second ring gear and the third ring gear are formed so as to become larger from the first stage to the third stage, through which the planetary gear set of each stage is inserted into the reducer housing, The convenience of the apparatus can be improved.

In addition, since the gears of the one-stage planetary gear set connected to the motor are constituted by helical gears, it is possible to transmit a large power to the three-stage planetary gear set through the increase of the amount of engagement, And the vibration can be minimized.

In addition, since the gears constituting the two-stage planetary gear set and the three-stage planetary gear set are constructed of spur gears, the strength and durability can be increased.

In the planetary gear set, a ball bearing is provided in a portion where support for thrust and rotation is required, and a thrust bearing is provided between adjacent carriers to reduce the size of the reducer while maintaining a sufficient supporting force against thrust. It is possible to reduce the vibration and increase the efficiency of the reducer and improve the durability.

Further, by pressing the bearing located at the outermost position in the direction of the output shaft by using the wave washer and the washer cover, it is possible to adjust the axial clearance of the entire reducer, thereby improving the durability and performance of the reducer have.

1 is a view of an active stabilizer system of a vehicle to which a speed reducer according to the present invention is applied,
Fig. 2 is a schematic view of the configuration of a speed reducer according to the present invention,
Fig. 3 is a view showing a ring gear housing in which a one-stage carrier, a two-stage carrier and a three-stage carrier are integrally formed in accordance with the present invention,
FIG. 4 is a view showing a state where a one-stage planetary gear set, a two-speed planetary gear set, and a three-speed planetary gear set are assembled in the ring gear housing of FIG.
5 is a view of a wave washer according to the present invention.

Hereinafter, a speed reducer for an active stabilizer system of a vehicle according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

1 to 5, the speed reducer 10 for an active stabilizer system of a vehicle according to the present invention is provided to connect a stabilizer bar 1 on one side and a stabilizer bar 2 on the other side so as to control the roll angle of the vehicle body Thereby improving turning stability and running stability.

The one stabilizer bar 1 and the other stabilizer bar 2 are connected to the suspension arms 7 and 8 connected to the left and right wheels 5 and 6 via the stabilizer bar links 3 and 4, respectively .

The speed reducer 10 is composed of a motor 30 which is operated under the control of the controller 20 and a planetary gear set which receives the power of the motor 30 and transmits a decelerated rotational force.

Although the motor 30 is preferably a brushless motor with a stator and a rotor, a conventional motor with brushes or other types of motors may be used.

The stator is a coil for generating a magnetic force under the control of the controller 20. The rotor is a permanent magnet whose rotational speed and rotational direction are variable according to the intensity and direction of the current applied to the coil. The rotor will be described as the motor shaft 32. In Fig.

The controller 20 receives a signal from various sensors provided in the vehicle to estimate the roll state of the vehicle and controls the intensity and direction of the current applied to the motor 30 according to the estimated roll state of the vehicle, The sensors include a vehicle speed sensor 41, a steering angle sensor 42 for detecting the steering angle of the steering wheel, a lateral acceleration sensor 43, an acceleration sensor 44, a yaw rate sensor 45).

The motor 30 is constituted by a motor case 21 for protecting a coil corresponding to a stator and a motor shaft 32 for rotating when a current is applied to the coil. The motor case 31 has a stabilizer bar 1 Stage planetary gear set 50 to be described later and the other stabilizer bar 2 is connected to a three-stage planetary gear set 70 (to be described later) Stage carrier C3 so that the motor shaft 32 becomes an input shaft in the speed reducer 10 according to the present invention and the three-stage carrier C3 becomes an output shaft.

The planetary gear set constituting the speed reducer 10 according to the present invention is composed of a single-stage planetary gear set 50, a two-stage planetary gear set 60 and a three-stage planetary gear set 70. [

Stage planetary gear set 50 is constituted by a one-stage sun gear S1 capable of transmitting power through engagement of gear teeth, a one-stage planetary gear P1, a one-stage carrier C1 and a one-stage ring gear R1 Stage planetary gear set 60 is constituted by a two-stage sun gear S2 and a two-stage planetary gear P2 and a two-stage carrier C2 and a two-stage ring gear R2, 70 is constituted by a three-stage sun gear S3, a three-stage planetary gear P3, a three-stage carrier C3 and a three-stage ring gear R3.

The one-stage sun gear S1 is directly connected to the motor shaft 32. The one-stage carrier C1 and the two-stage sun gear S2 are directly connected, the two-stage carrier C2 and the three- , The three-stage carrier C3 is connected to the stabilizer bar 2 on the other side, and the one-stage ring gear R1, the two-stage ring gear R2 and the three-stage ring gear R3 are non- So that the overall speed reducer 10 has a structure directly coaxial to the three-stage planetary gear set 70 from the one-stage planetary gear set 50 to the compact size along the longitudinal direction of the stabilizer bar There are advantages to be able to.

As described in the present invention, when the speed reducer is constructed using the three-stage planetary gear set, it is possible to realize a large output torque with respect to the input torque, thereby realizing a speed reducer having high efficiency and responsiveness.

Stage carrier C 1 and the two-stage carrier C 2 in the speed reducer according to the present invention act as the output shaft of the one-stage planetary gear set 50 and the two-stage planetary gear set 60, Set 60 and the three-stage planetary gear set 70, which can reduce the number of parts, reduce weight and cost, and further reduce the size of the entire reducer. .

Stage carrier C 1 serves as the output shaft of the one-stage planetary gear set 50 and serves as the input shaft of the two-stage planetary gear set 60 at the same time, and the two-stage carrier C 2, Stage planetary gear set 70 and the input shaft of the three-stage planetary gear set 70. [0051] As shown in FIG.

To this end, the first stage carrier C1 and the second stage sun gear S2 may be integrally formed, or they may be manufactured as a separate product and then coupled to each other to transmit power.

Also, the two-stage carrier C2 and the three-stage sun gear S3 may be integrally formed, or may be a structure in which they are separately manufactured and then coupled to each other to transmit power.

If the first-stage carrier C1, the second-stage sun gear S2, the second-stage carrier C2, and the third-stage sun gear S3 are fabricated separately, serration coupling may be performed between them, It is preferable to perform welding.

The single stage planetary gear set 50, the two-stage planetary gear set 60 and the three-stage planetary gear set 70 according to the present invention are constructed such that the overall outer size D1 is the same size And the gear module value is configured to increase from the one-stage planetary gear set 50 to the three-stage planetary gear set 70.

That is, when the power is transmitted from the one-stage planetary gear set 50 to the three-stage planetary gear set 70, the output torque increases as the deceleration progresses. As the output torque increases, Stage planetary gear set 70. In order to be able to withstand an increasing load, the gear module value must be increased toward the three-stage planetary gear set 70, and as the gear module value becomes larger, It is general that the overall outer size of the antenna should be large.

However, since the entire outer size D1 of the reducer is formed to have the same size in order to maintain the size of the reducer at a compact size, the gear module value becomes larger toward the three-stage planetary gear set 70, And the reduction ratio is reduced as the planetary gear set 70 is moved toward the planetary gear set 70.

It is not preferable that the output torque, the gear module value, the reduction ratio, and the like as described above are design parameters that can be changed as needed when designing the reduction gear, and are specified to any one value.

The first stage ring gear R1, the second stage ring gear R2 and the third stage ring gear R3 in the speed reducer according to the present invention are mounted on the ring gear housing 90 manufactured separately from the reduction gear housing 80, And the ring gear housing 90 may be inserted into the reduction gear housing 80 to be integrally coupled to the reduction gear housing 80. In this case, So that the assembly accuracy such as axial alignment can be improved.

Stage sun gear S1 and the assembly 51 of the first stage planetary gear P1 and the first stage carrier C1 are coupled to the one-stage ring gear R1 formed integrally with the inner diameter of the ring gear housing 90 Stage planetary gear set 50. The two-stage sun gear S2 and the two-stage planetary gear P2 and the assembly 61 of the two-stage carrier C2 are coupled to the two-stage ring gear R2, Stage planetary gear set 60. The three-stage sun gear S3 and the three-stage planetary gear P3 and the assembly 71 of the three-stage carrier C3 are coupled to the three-stage ring gear R3, Thereby forming the planetary gear set 70.

The reduction gear according to the present invention is characterized in that the inner diameters d1, d2 and d3 of the one-stage ring gear R1, the two-stage ring gear R2 and the three-stage ring gear R3 gradually increase from the first stage to the third stage The formed structure is characterized.

That is, the first-stage ring gear R1, the second-stage ring gear R2 and the third-stage ring gear R3 are integrally formed on the inner diameter of the ring gear housing 90, and the ring gear housing 90 is formed integrally with the reduction gear housing Stage planetary gear S1 and the one-stage planetary gear set 80 via the one end of the reduction gear housing 80 and the one end of the ring gear housing 90 (the right end in the illustrated state) Stage planetary gear set 50 as a result of being coupled with the one-stage ring gear R1 after the assembly 51 of the first stage carrier P1 and the first stage carrier C1 is inserted, Stage planetary gear set 60 as the planetary gear P2 and the assembly 61 of the two-stage carrier C2 are inserted and engaged with the two-stage ring gear R1. Finally, the three- Stage planetary gear set 70 is formed by inserting the three-stage planetary gear P3 and the assembly 71 of the three-stage carrier C3 into the three-stage ring gear R3.

Therefore, in order to smoothly insert the assemblies 51, 61, and 71 constituting each planetary gear set sequentially through one end of the reducer housing 80 and one end of the ring gear housing 90, The inner diameter d1 of the one-stage ring gear R1 corresponding to the innermost position is the smallest and the inner diameter d2 of the two-stage ring gear R2 corresponding to the next intermediate position is the inner diameter d2 of the one- It is preferable that the inner diameter d3 of the three-stage ring gear R3, which is larger than the inner diameter d1 and corresponds to the outermost position, is the largest.

In addition, the gears (one-stage sun gear, one-stage planetary gear, one-stage carrier, one-stage ring gear) constituting the one-stage planetary gear set 50 in the speed reducer according to the present invention, And helical gears for reduction.

Stage planetary gear set 50 because the power of the motor 30 must be transmitted through the first-stage planetary gear set 50 to the second-stage planetary gear set 60 and the third- The gears constituting the first-stage planetary gear set 50 are constituted by helical gears. In this case, the gears constituting the first-stage planetary gear set 50 are composed of helical gears.

The first stage planetary gear set 50 receives the power of the motor 30 for the first time. When the power is received from the motor 30 and driven, noise and vibration are generated due to the input torque. In order to reduce such noise and vibration as much as possible, it is preferable that the first stage planetary gear set 50 is constituted by a helical gear which is advantageous to noise and vibration more than a spur gear.

In the speed reducer according to the present invention, the gears (two-stage sun gear, two-stage planetary gear, two-stage carrier, two-stage ring gear) and the three-stage planetary gear set 70 constituting the two- The gears (three-stage sun gear, three-stage planetary gear, three-stage carrier, three-stage ring gear) constituting the gears are preferably spur gears for increasing strength and durability.

Stage planetary gear set 50 is constituted by a helical gear, the input shaft direction (the direction of the arrow M1 in Fig. 4 in the direction of the single-shaft sun gear connected to the motor shaft) Or in the direction of the output shaft (the direction of arrow M2 in Fig. 4 in the direction of the three-stage carrier connected to the other side stabilizer).

The thrust is generated as the smallest force in the first-stage planetary gear set 50 connected first to the motor 30 and increases as it goes to the two-stage planetary gear set 60, The present invention can reduce the overall size of the speed reducer while realizing a high output torque with respect to the input torque and at the same time reducing the thrust generated by the gears, Stage planetary gear set 60 and the three-stage planetary gear set 70, each of which is constituted by a helical gear, and the relatively large thrust is generated, .

In addition, the thrust as described above acts as a factor to increase the frictional force between the components of the adjacent rotating body. If the frictional force increases, the noise and vibration become large, and further, the life of the reducer is shortened. It is possible to sufficiently reduce the thrust to be increased from the planetary gear set 50 to the three-stage planetary gear set 70 to the overall size of the reducer and secure the support of the rotating body, thereby improving the efficiency and durability of the reducer This is characterized by the use of a bearing that can be used.

That is, according to the present invention, since the inner ring is assembled to the one-stage carrier (C1) and the outer ring is assembled to the reducer housing (80) 1 ball bearing 91; Stage carrier C 1 and the two-stage carrier C 2 are assembled with the outer ring assembled with the outer ring and the inner ring is assembled to the two-stage carrier C 2, A second ball bearing 92 for supporting the second ball bearing 92; A third ball bearing (not shown) supporting the rotational direction of the two-stage carrier C2 and the thrust in the output shaft direction M2 by assembling the inner ring to the two-stage carrier C2 and the outer ring assembled to the three- 93); And a fourth ball bearing (not shown) for supporting the rotational direction of the three-stage carrier (C3) and the thrust in the output shaft direction (M2) with the inner ring assembled to the three-stage carrier (C3) and the outer ring assembled to the ring gear housing (94).

The present invention also provides a thrust bearing 95 provided between the first stage carrier C1 and the second stage carrier C2 for reducing the frictional force between the first stage carrier C1 and the second stage carrier C2 by the thrust of the first stage carrier C1 When the thrust of the output shaft direction M2 generated in the first stage planetary gear set 50 is larger than the supporting force of the second ball bearing 92, the thrust bearing 95 is rotated together with the second ball bearing 92, The frictional force between the first-stage carrier C1 and the second-stage carrier C2 is reduced by supporting the thrust of the direction M2, thereby reducing noise and vibration, thereby increasing the efficiency and durability of the reducer finally .

The speed reducer according to the present invention further includes a retaining ring 96 fixed to the three-stage carrier C3 and supporting the one side surface (one side surface in the output axis direction) of the fourth ball bearing 94 to prevent the fourth ball bearing 94 from coming off ); A wave washer 97 installed to be supported on one side (one side in the output axis direction) of the outer ring of the fourth ball bearing 94; And a washer cover 98 for adjusting the axial clearance of the entire speed reducer by adjusting the width of the wave washer 97 through a preload by applying a preload to the wave washer 97 while being assembled to the speed reducer housing 80 .

The snap ring 96 has a structure in which an inner diameter portion is inserted and fixed to the outer circumferential surface of the three-stage carrier C3 and an outer diameter portion is provided to support one side of the inner ring of the fourth ball bearing 94. The wave washer 97 As shown in Fig. 5, the cross-sectional thickness t of the workpiece is the same, and is formed in a wave shape along the circumferential direction so that the axial height H has a dimension larger than the cross-sectional thickness t.

The washer cover 98 is assembled in a threaded manner in the reducer housing 80 so as to be movable in the input shaft direction M1 and the output shaft direction M2 in accordance with the rotation direction. It is preferable that a thread is formed on the inner diameter portion and a thread portion is formed on the outer circumferential surface of the washer cover 98 to be screwed with the thread of the reducer housing 80. [

As described above, the speed reducer according to the present invention can realize high output torque and high reduction ratio compared with the input torque by using the three-stage planetary gear set (50, 60, 70) It is possible to realize a high speed reduction gear, thereby effectively controlling the roll load generated when the vehicle is turning.

In the present invention, in implementing the speed reducer using the three-stage planetary gear set (50, 60, 70), the first stage carrier C1 and the second stage sun gear S2 are directly connected, The three-speed sun gear S3 is directly connected so that the overall speed reducer has a structure directly coaxially connected from the one-stage planetary gear set 50 to the three-speed planetary gear set 70, so that the compact reducer is compactly formed along the longitudinal direction of the stabilizer bar. There is an advantage that it can be configured in one size.

Stage carrier C 1 and the two-stage carrier C 2 serve as output shafts of the one-stage planetary gear set 50 and the two-stage planetary gear set 60, respectively, And the input shaft of the three-stage planetary gear set 70. Thus, it is possible to reduce the number of components, reduce weight and cost, and further reduce the size of the entire reducer .

In addition, since the overall outer size D1 of the one-stage planetary gear set 50, the two-stage planetary gear set 60, and the three-stage planetary gear set 70 are formed to have the same size, The planetary gear set 70 is constructed so that the gear module value becomes larger as it goes from the first planetary gear set 50 to the third planetary gear set 70. Therefore, The strength and durability of the reducer can be improved and the performance of the reducer can be improved.

The speed reducer of the present invention is characterized in that the one-stage ring gear R1, the two-stage ring gear R2 and the three-stage ring gear R3 are mounted on the inner diameter of the ring gear housing 90, which is produced separately from the reducer housing 80 And the ring gear housing 90 is inserted into the reducer housing 80 to be integrally coupled to the reducer housing 80. The structure of the ring gear housing 90 facilitates the dimensional management due to the assembly between the parts, It is possible to increase the assembling precision.

The reduction gear according to the present invention is characterized in that the inner diameters d1, d2 and d3 of the one-stage ring gear R1, the two-stage ring gear R2 and the three-stage ring gear R3 gradually increase from the first stage to the third stage 60, and 70 are inserted into the reduction gear housing 80 through the formed structure, thereby improving the ease of assembly when the planetary gear sets 50, 60, and 70 are assembled.

In addition, according to the present invention, since the gears of the one-stage planetary gear set 50 connected to the motor 30 are constituted by helical gears, a large force can be transmitted to the three- So that a high output torque can be realized, and noise and vibration can be minimized.

In addition, since the gears constituting the two-stage planetary gear set 60 and the three-stage planetary gear set 70 are constituted by spur gears, there is an advantage that strength and durability can be increased.

Further, the present invention is characterized in that the ball bearings 91, 92, 93 and 94 are provided on the portions of the planetary gear set where support for thrust and rotation is required, and between the adjacent carriers C1 and C2, And a thrust bearing (95) capable of reducing the size of the speed reducer is provided, thereby reducing the noise and vibration, increasing the efficiency of the reducer, and improving the durability.

In addition, according to the present invention, the axial clearance of the entire reducer can be adjusted by pressing the outermost bearing in the direction of the output shaft by using the wave washer 97 and the washer cover 98, thereby improving the durability of the reducer and There is an advantage that performance can be improved.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be apparent to those of ordinary skill in the art.

1 - One side of the stabilizer 2 - The other side of the stabilizer
10 - Reduction gear 20 - Controller
30 - Motor 31 - Motor case
32 - Motor shaft 50 - 1st stage planetary gear set
60 - 2-speed planetary gear set 70 - 3-speed planetary gear set
80 - Reducer housing 90 - Ring gear housing
91 - first ball bearing 92 - second ball bearing
93 - Third ball bearing 94 - Fourth ball bearing
95 - Thrust bearings 96 - Snap ring
97 - Wave Washer 98 - Washer Cover
S1 - 1 step planetary gear P1 - 1 planetary gear
C1 - 1 stage carrier R1 - 1 stage ring gear
S2 - 2-speed sun gear P2 - 2 stage planetary gear
C2 - Two-stage carrier R2 - Two-stage ring gear
S3 - 3-speed sun gear P3 - 3-speed planetary gear
C3 - Three-stage carrier R3 - Three-stage ring gear

Claims (9)

The first-stage ring gear, the second-stage ring gear and the third-stage ring gear are constrained to rotate with each other, while the first-stage planetary gear set, the second-stage planetary gear set and the third-
The stabilizer bar of one side is connected to the case of the motor and the stabilizer bar of the other side is connected to the three-stage carrier serving as the output shaft;
The motor shaft is connected to the first stage sun gear as the input shaft, the first stage carrier is connected to the second stage sun gear, the second stage carrier is connected to the third stage sun gear;
Wherein the one-stage ring gear, the two-stage ring gear, and the three-stage ring gear are formed integrally with an inner diameter of a ring gear housing separately made from the reduction gear housing;
And a ring gear housing is inserted into the reduction gear housing and is integrally coupled to the reduction gear housing. The method according to claim 1,
Wherein the gears constituting the one-stage planetary gear set are constituted by helical gears;
Wherein the gears constituting the two-stage planetary gear set and the three-stage planetary gear set are spur gears. The method of claim 2,
In a state where the ring gear housing formed with the one-stage ring gear, the two-stage ring gear and the three-stage ring gear is coupled to the reduction gear housing, the one-stage ring gear is provided with a single- Assemblies are combined to form a single stage planetary gear set;
The two-stage ring gear and the three-stage ring gear are combined with an assembly of a two-stage sun gear, a two-stage planetary gear and a two-stage carrier formed of spur gears respectively, and an assembly of a three- Wherein the planetary gear set and the planetary gear set form a planetary gear set and a three-stage planetary gear set. The method of claim 3,
A first ball bearing that supports the first-stage carrier in the rotational direction and the thrust in the direction of the input shaft, wherein the first-stage carrier is assembled with the inner ring and the outer ring is assembled to the reducer housing;
A second ball bearing which supports the first-stage carrier and the second-stage carrier in the rotational direction and the thrust in the direction of the input shaft, in which the outer ring is assembled to the one-stage carrier and the inner ring is assembled to the two-
A third ball bearing supporting the two-stage carrier in the rotational direction and supporting the thrust in the direction of the output shaft, wherein the inner ring is assembled to the two-stage carrier and the outer ring is assembled to the three- And
And a fourth ball bearing which supports a rotational direction of the three-stage carrier and a thrust force in the direction of the output shaft, in which the inner ring is assembled to the three-stage carrier and the outer ring is assembled to the ring gear housing. Reduction gear. The method of claim 3,
And a thrust bearing provided between the one-stage carrier and the two-stage carrier for reducing the frictional force with the two-stage carrier due to the thrust of the one-stage carrier. The method of claim 5,
Wherein the thrust bearing supports the thrust in the direction of the output shaft together with the second ball bearing when the thrust in the direction of the output shaft generated in the first stage planetary gear set is larger than the bearing force of the second ball bearing and reduces the frictional force between the first stage carrier and the second stage carrier Wherein the first and second axles are spaced apart from each other. The method of claim 4,
Further comprising a snap ring fixed to the three-stage carrier and supporting one side of the fourth ball bearing to prevent disengagement of the fourth ball bearing. The method of claim 4,
A wave washer installed to be supported on one side of the outer ring of the fourth ball bearing; And
And a washer cover for adjusting the axial clearance of the entire reduction gear by adjusting a width of the wave washer through a preload by applying a preload to the wave washer while being assembled in the reducer housing. reducer. The method of claim 8,
Wherein the washer cover is assembled in a threaded manner in the housing of the reducer so as to be movable in the direction of the input shaft and the direction of the output shaft according to the rotating direction.

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