KR20170121521A - Reducer for active stabilizer - Google Patents

Abstract

The present invention relates to a speed reducer for an active stabilizer system of a vehicle. By implementing a speed reducer using three-stage planetary gear sets (50, 60, 70), it is possible to realize a high output torque and a high reduction ratio, Ball bearings and thrust bearings are installed at positions where the thrust is generated and where the bearings are required for rotation, thereby reducing noise and vibration, increasing the efficiency of the reducer and improving durability, and improving the productivity by improving the assemblability .

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.

Also, in realizing a reduction gear for a stabilizer system, it is also an important task to improve the workability and assemble more smoothly in order to improve productivity when assembling a multi-stage planetary gear set for seeking a high output torque and a high reduction ratio. It is one.

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 provides a reduction gear for an active stabilizer system in which a speed reducer composed of a three-stage planetary gear set is applied to a stabilizer bar. It is possible to realize a high output torque and a high reduction ratio to the input torque, In particular, when the rotating body is driven, the rotating body is strongly supported while minimizing the frictional force between the adjacent components, thereby reducing vibrations and noise, thereby increasing efficiency and durability of the speed reducer. .

Another object of the present invention is to improve productivity by improving assemblability in realizing a speed reducer composed of a three-stage planetary gear set.

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; A motor shaft groove of a polygonal cross section having a minimum of three sides is formed at an end of the motor shaft; Wherein the one-stage sun gear is formed to have the same cross section as the motor shaft groove and is formed at one end of the coupling portion to be engaged with the motor shaft groove and the tool insertion groove is formed at the other end; The two-stage sun gear, the three-stage sun gear and the three-stage carrier are each formed with a two-stage sun gear hollow hole, a three-stage sun gear hollow shaft and a three-stage carrier hollow hole penetrating coaxially; And the tool insertion groove is configured to be exposed to the outside through a two-stage sun gear hollow hole, a three-stage sun gear hollow hole, and a three-stage carrier hollow hole.

And a stopper member installed to cover the three-stage carrier hollow hole for maintaining the inner airtight state in a state where assembling up to the three-stage planetary gear set is completed.

Wherein the one-stage ring gear, the two-stage ring gear and the three-stage ring gear are formed in an inner diameter of a ring gear housing made separately 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 outer peripheral surface of the ring gear housing is divided into a ring gear housing serration portion and a sliding portion along the longitudinal direction of the ring gear housing; A reduction gear housing serration portion is provided on the inner diameter of the reduction gear housing; And the ring gear housing serration portion is engaged with the reduction gear housing serration portion by forcibly press-fitting, so that the ring gear housing is rotatably supported by the housing of the ring gear housing when the ring gear housing is inserted into the reducer housing, And the rotation of the rotor is restrained.

In the state where the single-speed sun gear is assembled to the motor shaft and the ring gear housing is inserted into the reduction gear housing, the single stage planetary gear and the single stage carrier assembly are assembled to the single stage sun gear and the single stage ring gear, Configure; Stage planetary gear set, a two-stage sun gear, a two-stage planetary gear and a two-stage carrier assembly are assembled in a two-stage ring gear so as to be able to transmit power to the one-stage carrier, ; Stage planetary gear set, a three-stage sun gear, a three-speed planetary gear and a three-stage carrier assembly are assembled in a three-stage ring gear so as to be able to transmit power to a two-stage carrier, .

Wherein when the one-stage sun gear is assembled to the motor shaft and the ring gear housing is inserted into the reduction gear housing, the gear teeth of the one-stage planetary gear and the one-stage planetary gear are engaged with the one- And the end of the first stage sun gear is further projected in the direction of the output shaft than the first stage ring gear so as to start before the gear tooth engagement of the ring gear.

Stage planetary gear set, the gear tooth engagement of the two-stage sun gear and the two-stage planetary gear is started before the gear tooth engagement of the two-stage planetary gear and the two- And the end of the single sun gear is further projected in the direction of the output shaft than the two-stage ring gear.

When the three-stage planetary gear set is constructed with the two-stage planetary gear set configured, the gear tooth engagement of the three-stage sun gear and the three-stage planetary gear is started before the gear tooth engagement of the three- And the end of the single sun gear is further projected in the direction of the output shaft than the three-stage ring gear.

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.

In addition, the present invention improves the assemblability in realizing the speed reducer constituted by the three-stage planetary gear set, thereby improving the productivity.

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,
3 is a sectional view for explaining a structure of a speed reducer according to the present invention,
4 is a view for explaining a coupling structure of a motor shaft and a single-stage sun gear according to the present invention,
5 to 13 are views for explaining the assembling process of the one-stage planetary gear set, the two-planetary planetary gear set, and the three-planetary planetary gear set according to the present invention,
14 is a view of a wave washer used in 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 one-stage ring gear R1, the two-stage ring gear R2 and the three-stage ring gear R3 are integrally formed on the inner diameter of the ring gear housing 90 separately made from the reducer housing 80, The ring gear housing 90 is inserted into the reducer housing 80 to be integrally coupled to the reducer housing 80. In this case, it is easy to manage the dimensions according to the assembly between the parts, and furthermore, There is an advantage to increase.

5, a first stage sun gear S1 is assembled to a motor shaft 32, a ring gear housing 90 is inserted into a reduction gear housing 80 as shown in FIG. 6, The assembly 51 of the first stage planetary gear P1 and the first stage carrier C1 is inserted and engaged with the first stage sun gear S1 and the first stage ring gear R1 as shown in Fig. Thereby constituting the same first-stage planetary gear set 50.

The two-stage sun gear S2, the two-stage planetary gear P2, and the assembly 61 of the two-stage carrier C2 are inserted into the two-stage sun gear S2, Stage planetary gear set 60 as shown in Fig. 11 as the second planetary gear set S2 is coupled so as to be able to transmit power to the first-stage carrier C1 and the second-stage planetary gear P2 is to be engaged with the second- .

Finally, the assembly 71 of the three-stage sun gear S3, the three-stage planetary gear P3 and the three-stage carrier C3 is inserted in the state of configuring the two-stage planetary gear set 60 as shown in Fig. 11, Stage planetary gear set 70 (Fig. 13) as shown in Fig. 13 as the sun gear S3 is coupled so as to be able to transmit power to the two-stage carrier C2 and the three-stage planetary gear P3 is engaged with the three- ).

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 ring gear housing 90, in which the single-speed sun gear S1 is mounted on the motor shaft 32 and the single-stage ring gear R1, the double-stage ring gear R2 and the three-stage ring gear R3 are formed, Stage planetary gears P1 and one-stage planetary gears P1 and P2 through the one end of the reducer housing 80 and the one end of the ring gear housing 90 (right end in the illustrated state) while being inserted into the housing 80, Stage sun gear S2 and the second-stage sun gear S2 as the first-stage planetary gear set 50 is engaged with the first-stage sun gear S1 and the first-stage ring gear R1, Stage planetary gear set P2 and the two-stage carrier C2 are combined and combined with the one-stage carrier C1 and the two-stage ring gear R1 to form a two-stage planetary gear set 60 And finally the assembly 71 of the three-stage sun gear S3 and the three-stage planetary gear P3 and the three-stage carrier C3 is inserted and combined with the two-stage carrier C2 and the three-stage ring gear R3 Thereby forming a three-stage planetary gear set 70.

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. 3 in the direction of the single-shaft sun gear connected to the motor shaft) Or in the direction of the output shaft (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, a first ball bearing (first bearing) C1 supporting a rotational direction of the first-stage carrier C1 and a thrust force toward the input shaft direction M1 is formed by assembling the inner ring to the first- 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. [

On the other hand, in order to assemble the motor shaft 32 and the one-stage sun gear S1, a motor shaft groove 32a having a polygonal cross section with at least three sides is formed at the end of the motor shaft 32, S1 are formed in the same section as the motor shaft groove 32a and are formed at one end with an engaging portion 52 to be engaged with and engaged with the motor shaft groove 32a and at the other end with a tool insertion groove 53 into which the tool 99 can be inserted, .

The motor shaft groove 32a and the one-stage sun gear S1 are formed in a rectangular cross-sectional shape. However, the present invention is not limited thereto, The engaging portion 52 of the first-stage sun gear S1 may be coupled through serration.

Stage sun gear hollow hole 62, a three-stage sun gear hollow hole 72 and a three-stage carrier hollow hole 62 coaxially penetrated through the two-stage sun gear S2, the three-stage sun gear S3 and the three- The tool insertion groove 53 is exposed to the outside through the two-stage sun gear hollow hole 62, the three-stage sun gear hollow hole 72 and the three-stage carrier hollow hole 73, And the tool 99 is inserted into the reduction gear through the three-stage carrier hollow hole 73, the three-stage sun gear hollow hole 72 and the two-stage sun gear hollow hole 62, And inserted into the tool insertion groove 53 of the sun gear S1.

That is, the one-stage sun gear S1 is assembled to the motor shaft 32, the ring gear housing 90 is inserted into the reduction gear housing 80, and then the planetary gear set 50, The planetary gear set 60 and the three-stage planetary gear set 70 are assembled as shown in Fig. 13, the gear teeth of the first stage sun gear S1 and the first stage planetary gear P1 are imperfectly interlocked State.

When the one-stage sun gear S1 and the one-stage planetary gear P1 are maintained in the incomplete meshing state as described above, the worker moves the three-stage carrier hollow hole 73, the three-stage sun gear hollow hole 72, The tool 99 is inserted into the interior of the speed reducer through the hollow hole 62 to insert the end of the tool 99 into the tool insertion groove 53 of the first stage sun gear S1, Stage sun gear S1 is rotated by the operation of the first-stage sun gear S1 and the first-stage sun gear S1 and the first-stage planet gear P1 in the final engagement state (gear timing).

After completing the gear timing work using the tool 99, the lubricant (grease or oil) is filled in the internal space of the reducer for smooth operation of the reducer components, so that the present invention can prevent leakage of the lubricant Finally, the stopper member 100 is installed as shown in FIG.

The stopper member 100 is installed so as to close the three-stage carrier hollow hole 73 in order to maintain the airtightness of the speed reducer. The material of the stopper member 100 may be any one of rubber, silicon, Other materials with sealing performance may be possible.

The outer peripheral surface of the ring gear housing 90 is divided into a ring gear housing serration portion 90a and a sliding portion 90b along the longitudinal direction of the ring gear housing 90. The ring gear housing serration portion 90a Are formed at intermediate positions and the sliding portion 90b is positioned at both sides of the serration portion 90a.

When the ring gear housing 90 is inserted into the reduction gear housing 80 as shown in FIG. 6, the sliding portion 90b is engaged with the reduction gear housing 80, The ring gear housing serration portion 90a is engaged with the reducer housing serration portion 81 forcibly press-fitting so that the ring gear housing serration portion 80a is in contact with the inside diameter of the housing 80, Thereby restricting the rotation of the housing 90.

When the concentricity of the reducer housing 80 and the ring gear housing 90 is adjusted by the sliding portion 90b when the ring gear housing 90 is inserted into the reducer housing 80, The concentricity of the rotating parts of the respective planetary gear sets 50, 60, and 70 to be inserted is naturally adjusted. When the concentricity of the rotating parts constituting the speed reducer is changed, eccentric rotation of the rotating parts occurs. The part reduces the performance of the reducer and further reduces the durability of the reducer. To prevent this, the overall concentricity of the reducer part can be adjusted by using the sliding part 90b of the ring gear housing 90.

The reason why the sliding portions 90b for aligning the concentricity in the ring gear housing 90 are located on both sides of the ring gear housing serration portion 90a is that the ring gear housing 90 So that the overall concentricity of the reducer is uniformly maintained across the left and right ends of the reducer.

Stage planetary gears P1 and one-stage planetary gears P1 and P2 in a state where the one-stage sun gear S1 is assembled to the motor shaft 32 and the ring gear housing 80 is inserted into the reducer housing 80, Stage planetary gear set 50 as shown in Fig. 9 by inserting the assembly 51 of the one-stage planetary gear C1 and the one-stage planetary gear C1, It is preferable to configure the gear tooth engagement to start before the gear tooth engagement of the first stage planetary gear P1 and the first stage ring gear R1. This is because it is preferable that the assembly of the first stage planetary gear P1 and the first stage carrier C1 It is preferable that the end of the one-stage sun gear S1 further protrudes in the output shaft direction M1 from the one-stage ring gear R1. In FIG. 8, the end of the first stage sun gear S1 is further protruded by the length of L1.)

Since the ring gear housing 90 having the one-stage ring gear R1 is integrally coupled with the reducer housing 80 and can not be rotated, when the one-stage planetary gear set 50 is constructed, Stage sun gear S1 and the first stage ring gear R1 are started or started at the same time as the gear teeth engagement of the first stage sun gear S1 and the first stage planetary gear P1, When the gear teeth of the first stage planetary gear P1 are not engaged with each other or incomplete engagement is made, the assembly 51 of the first stage planetary gear P1 and the first stage carrier C1 can not be rotated, A problem that the coupling state can not be induced occurs. That is, the first stage planetary gear P1 and the first stage ring gear R1 are engaged with gear teeth, so that the assembly 51 can not be rotated.

However, when the first stage sun gear S1 and the first stage planetary gear P1 are completely engaged with each other due to the gear tooth engagement of the first stage sun gear S1 and the first stage planetary gear P1 being started first, The gear teeth of the first planetary gear P1 and the first ring gear R1 naturally come into complete engagement with each other and the gear teeth of the first planetary gear P1 and the first ring gear R1 are not engaged with each other Stage planetary gear set P1 and the first-stage carrier C1 can be rotated even if the first-stage planetary gear set 50 or the first-stage planetary gear set 50 is incompletely engaged, the first-stage planetary gear set 50 can be assembled in a normal state.

Stage planetary gear set 60 is constructed by inserting the assembly 61 of the two-stage planetary gear P2 and the two-stage carrier C2 in the state of configuring the one-stage planetary gear set 50 as shown in Fig. , The gear tooth engagement of the two-stage sun gear S2 and the two-stage planetary gear P2 is performed before the gear engagement of the two-stage planetary gear P2 and the two-stage ring gear R2 as shown in Fig. Stage planetary gear P2 and the two-stage carrier C2 are assembled more easily. To this end, the present invention is applied to a two-stage sun gear S2, (In Fig. 10, the end of the two-stage sun gear S2 further protrudes by the length of L2), and the end of the second sun gear S2 protrudes further in the output shaft direction M1 than the two- The reason is the same as described above, and a detailed description will be omitted.

13, the three-stage planetary gear set P3 and the three-stage carrier C3 assembly 71 are inserted into the three-stage planetary gear set 60 as shown in Fig. The gear tooth engagement of the three-stage sun gear S3 and the three-stage planetary gear P3 is transmitted to the gears of the three-stage planetary gear P3 and the three-stage ring gear R3, Stage planetary gear P3 and the three-stage carrier C3 are assembled more easily. To this end, the present invention is characterized in that the three-stage planetary gear P3 and the three- It is preferable that an end of the sun gear S3 is further protruded in the output shaft direction M1 than the three-stage ring gear R3 (in FIG. 12, the configuration in which the end of the third stage sun gear S3 is further projected by the length of L3 The reason for this is the same as described above, and a detailed description thereof will be omitted.

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.

In addition, the present invention has an advantage that productivity can be improved because assemblability can be improved in realizing a speed reducer composed of three-stage planetary gear sets (50, 60, 70).

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 33 - Motor shaft groove
50 - 1st stage planetary gear set 53 - Tool insert groove
60 - 2-speed planetary gear set 70 - 3-speed planetary gear set
80 - Reducer housing 90 - Ring gear housing
90a - Ring gear housing serration part 90b - Sliding part
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
99 - tool 100 - plug member
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 (8)

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;
A motor shaft groove of a polygonal cross section having a minimum of three sides is formed at an end of the motor shaft;
Wherein the one-stage sun gear is formed to have the same cross section as the motor shaft groove and is formed at one end of the coupling portion to be engaged with the motor shaft groove and the tool insertion groove is formed at the other end;
The two-stage sun gear, the three-stage sun gear and the three-stage carrier are each formed with a two-stage sun gear hollow hole, a three-stage sun gear hollow shaft and a three-stage carrier hollow hole penetrating coaxially;
Wherein the tool insertion groove is configured to be exposed to the outside through a two-step sun gear hollow hole, a three-step sun gear hollow hole, and a three-step carrier hollow hole. The method according to claim 1,
Further comprising a stopper provided to close the three-stage carrier hollow hole to maintain the inner airtight state in a state where assembling up to the three-stage planetary gear set is completed. The method according to claim 1,
Wherein the one-stage ring gear, the two-stage ring gear and the three-stage ring gear are formed in an inner diameter of a ring gear housing made separately from the reduction gear housing;
Wherein the ring gear housing is inserted into the reduction gear housing and is integrally coupled to the reduction gear housing. The method of claim 3,
The outer peripheral surface of the ring gear housing is divided into a ring gear housing serration portion and a sliding portion along the longitudinal direction of the ring gear housing;
A reduction gear housing serration portion is provided on the inner diameter of the reduction gear housing;
And the ring gear housing serration portion is engaged with the reduction gear housing serration portion by forcibly press-fitting, so that the ring gear housing is rotatably supported by the housing of the ring gear housing when the ring gear housing is inserted into the reducer housing, Of the vehicle body (2). The method of claim 3,
In the state where the single-speed sun gear is assembled to the motor shaft and the ring gear housing is inserted into the reduction gear housing, the single stage planetary gear and the single stage carrier assembly are assembled to the single stage sun gear and the single stage ring gear, Configure;
Stage planetary gear set, a two-stage sun gear, a two-stage planetary gear and a two-stage carrier assembly are assembled in a two-stage ring gear so as to be able to transmit power to the one-stage carrier, ;
Stage planetary gear set, a three-stage sun gear, a three-speed planetary gear and a three-stage carrier assembly are assembled in a three-stage ring gear so as to be able to transmit power to a two-stage carrier, Wherein the first and second axes of the first and second axles are connected to each other. The method of claim 5,
Wherein when the one-stage sun gear is assembled to the motor shaft and the ring gear housing is inserted into the reduction gear housing, the gear teeth of the one-stage planetary gear and the one-stage planetary gear are engaged with the one- Wherein the end of the first stage sun gear is further projected in the direction of the output shaft than the first stage ring gear so as to start before the gear tooth engagement of the ring gear. The method of claim 5,
Stage planetary gear set, the gear tooth engagement of the two-stage sun gear and the two-stage planetary gear is started before the gear tooth engagement of the two-stage planetary gear and the two- And the end of the step gear is further projected in the direction of the output shaft than the second stage ring gear. The method of claim 5,
When the three-stage planetary gear set is constructed with the two-stage planetary gear set configured, the gear tooth engagement of the three-stage sun gear and the three-stage planetary gear is started before the gear tooth engagement of the three- And the end of the single sun gear is further projected in the direction of the output shaft than the three-stage ring gear.

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