KR20170075553A

KR20170075553A - Actuator of transmission

Info

Publication number: KR20170075553A
Application number: KR1020150185360A
Authority: KR
Inventors: 이만복; 강승익
Original assignee: 현대다이모스(주)
Priority date: 2015-12-23
Filing date: 2015-12-23
Publication date: 2017-07-03
Also published as: KR101765400B1

Abstract

A control shaft (30) driven by a motor (10) is provided with control fingers (41a, 42a, 51a, 51b) in the same number as a shift lug and is inserted into an intermediate groove portion of a shift lug And the control fingers 41a, 42a, 51a and 51b are fixed to the control shaft 30 by the phase transition of the MR fluid 70. [ The selection and shifting of all the gear positions can be performed by one actuator, so that the number of actuators can be greatly reduced, so that the transmission can be compactly constructed.

Description

Actuator of transmission < RTI ID = 0.0 >

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator of a transmission, and more particularly, to an actuator that provides power to select and shift operations of a control finger.

With the development of electronic control technology, in the case of a dual clutch transmission (DCT) or an automatic manual transmission (AMT) based on a manual transmission, the mechanism operation required for shifting is performed by an electronically controlled actuator.

Such a prior art example is shown in Fig. The illustrated example is an example of a transmission operating mechanism having a total of four actuators such as a pair of select solenoids 2a and 2b and a pair of shift motors 3a and 3b.

A shift finger member 6 having odd-numbered shift fingers 6a and a shift finger member 7 having odd-numbered shift fingers 7a are mounted on the control shaft 1 which is vertically movable and rotatable.

The select solenoids 2a and 2b move the control shaft 1 upward and downward through the pivotal arm 4a and the lift block 4b so as to move the shift fingers 6a and 7a up and down And the shift motors 3a and 3b rotate the control shaft 1 via the shift nut 5 so as to pivot the shift fingers 6a and 7a So that the shifting is performed.

2 shows an example of a combination of an odd-numbered-way shift lug consisting of a 1-3-step shift lug 8a and a 5-7-step shift lug 8b, a 2-4-step shift lug 9a and a 6- An even means shift lug is shown. One of the odd-numbered shift lugs and one of the odd-numbered shift lugs is located in one of the odd-numbered shift lugs, and the even-numbered shift fingers 7a are located in one of the odd-numbered shift lugs.

The shift fingers 6a and 7a move up and down during the operation of the select solenoids 2a and 2b to select a shift lug including a shift target among the various shift lugs, As the shift fingers 6a and 7a are rotated, the shift lug is pushed toward the end of the shift range, so that the shift fork equipped with the shift lug is shifted in the shift direction on the shift rail to shift the gear.

However, in the conventional technology as described above, four actuators are required for shifting, such as two select solenoids, two shift motors, and the like.

In addition, since the shift motor uses an expensive BLDC motor, the manufacturing cost is increased.

In addition, the select solenoid has a problem that the degree of impact noise generated when the plunger stops at the final point is excessive because the plunger moves at a very high speed during operation. This is even more serious if the vehicle to which the transmission is applied is a hybrid or electric vehicle.

Also, since the shifting finger is shifted between the shift lugs, if the shifting finger does not move accurately, the selection is inaccurate and the shifting is performed incorrectly, .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an automatic transmission having a simple structure and a compact structure by being able to perform selection and shifting of even- And an object of the present invention is to provide an actuator of a transmission that can prevent a collision noise generated during operation of a select solenoid and prevent a malfunction so that an accurate shift can be always performed.

According to an aspect of the present invention, there is provided a control system for a control shaft, comprising: a motor; a reduction gear cell connected to the motor; a control shaft connected to the reduction gear cell; And a shift finger fixed in the direction of the finger.

The shift fingers are provided in the same number as the shift lugs, and all the shift fingers are inserted into the shift lug intermediate groove portions of the corresponding speed change stages.

A flange protruding from the outer periphery of the control shaft, and a shift wheel surrounding the flange. The shift wheel can not move in the control housing surrounding the periphery of the control shaft along the axial direction of the control shaft, The MR fluid is filled in the inside of the shift wheel, and the shift finger is integrally formed on the outer circumferential surface of the shift wheel.

A solenoid coil is disposed adjacent to the shift wheel, and a solenoid coil is mounted on the control unit housing.

A sealing ring is provided on the outer peripheral surface of the flange and one end of the shift wheel.

A plurality of rectangular parallelepiped-shaped dogs protrude from the MR fluid-contacting surface of the flange.

Wherein the reduction gear cell comprises a sun gear mounted on one end of a shaft of the motor, a plurality of planetary gears meshed between the sun gear and a ring gear provided in the motor housing, and a carrier connecting the planetary gears, And the control shaft are integrally formed.

The housing of the motor and the cover of the reduction gear cell are interlocked with each other, and the cover of the reduction gear cell is inserted and mounted in the actuator mounting portion formed in the transmission case.

And the other end of the control shaft is inserted and mounted in a concentric guide provided in the transmission case.

As described above, according to the present invention, selection and shifting of the even-numbered stage and the even-numbered shift lugs are all made possible by one actuator. Therefore, since only one actuator can be mounted on the transmission, the structure of the transmission is simplified and the size is reduced.

In addition, since an expensive BLDC motor which has been conventionally used as a shift motor is not used, the manufacturing cost is greatly reduced.

Further, since the conventional select solenoid is not used, the plunger impact noise is not generated during the select operation, so that the shift noise that causes discomfort does not occur.

Also, since the actuators of the present invention have the same shift fingers as those of the shift lugs and are matched with the shift lugs one by one, respectively, a separate selecting operation is unnecessary unlike the conventional shift finger. However, the shift fingers of the respective speed change stages to which the respective solenoid coils are to be instantaneously changed by phase transition of the MR fluid are directly connected to the control shaft.

In this way, accurate shift lug selection is always performed, so that malfunction due to the selection error does not occur, so that accurate shifting is always performed.

1 is a perspective view of a speed change device having a plurality of actuators as a prior art.
2 is a view showing an example of a shift lug arrangement and a shift finger according to the prior art.
3 is a cross-sectional view of a transmission actuator according to the present invention.
4 is an enlarged view of the shift control portion of Fig.
Fig. 5 is a view corresponding to Fig. 2 showing shift lug arrangement and operation example of a shift finger according to the present invention; Fig.
6 is a plan view of a flange formed on a control shaft;

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. The thicknesses of the lines and the sizes of the components shown in the accompanying drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, and these may vary depending on the intention of the user, the operator, or the precedent. Therefore, definitions of these terms should be made based on the contents throughout this specification.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a cross-sectional view of the transmission actuator according to the present invention. FIG. 4 is an enlarged view of the shift means 40 of the Hall means shown in FIG. 3. As shown in FIG. 3, the actuator of the transmission according to the present invention includes a motor 10, A reduction gear cell 20 connected to the motor 10, a control shaft 30 connected to the reduction gear cell 20, and a control shaft 30 mounted on the control shaft 30 at the same number as the shift lug, And shift fingers 41a, 42a, 51a and 52a fixed to the control shaft 30 in the rotating direction.

The motor 10 is provided with a stator 12 in the housing 11 and a rotor 13 inside the stator 12 and a shaft 14 in the center of the rotor 13 Structure motor. The shaft 14 is supported by bearings B1, B2.

The reduction gear cell 20 includes a sun gear 21 mounted on an end of a shaft 14 of the motor 10 as a planetary gear set for reducing the number of revolutions of the motor 10 and increasing transmission torque, A plurality of planetary gears 22 meshed with the planetary gears 22 and the planetary gears 22 and a carrier 23 connecting the planetary gears 22 and a cover 24 surrounding them and fastened to the housing 11 of the motor 10 .

The cover 24 is inserted into the through hole formed in the actuator mounting portion 110 of the transmission case.

The carrier 23 is integrally formed at one end of the control shaft 30. The other end of the control shaft 30 is inserted into the concentric guide portion 120 formed in the transmission case. Both ends of the control shaft 30 are supported by bearings B3 and B4, respectively.

The control shaft 30 is provided with an odd-numbered shift control unit 40 and an even-numbered shift control unit 50, respectively.

The odd-numbered-unit shift control section 40 and the even-numbered shift control section 50 are provided with the same number of shift fingers 41a, 42a (51a, 52a) Only the portion 40 will be described.

The shift control unit 40 includes disc-shaped flanges 33 and 34 protruding from the outer circumferential surface of the control shaft 30, shift wheels 41 and 42 surrounding the flanges 33 and 34, 42 and a plurality of shift fingers 41a, 42a protruding from one side of the outer circumferential surface of the shift wheels 41, 42 and a plurality of shift fingers 41a, 42a disposed adjacent to the shift wheels 41, Solenoid coils (43, 44).

The shift wheels 41 and 42 and the solenoid coils 43 and 44 are mounted on the cover 24 of the reduction gear cell 20 and are disposed inside the control housing 60 surrounding the periphery of the control shaft 30 Respectively. The double solenoid coils 43 and 44 are fixed to the control housing 60, and the shift wheels 41 and 42 are installed in a freely rotatable state although they can not move up and down.

The shift fingers 41a and 42a formed integrally with the shift wheels 41 and 42 are inserted into intermediate groove portions of the 5-7 stage shift lug 82 and the 1-3 stage shift lug 81, respectively Similarly, the shift fingers 51a and 52a of the even-numbered control section 50 are inserted into the intermediate groove sections of the 6-R stage shift lug 92 and the 2-4 stage shift lug 91, respectively.

The solenoid coils 43 and 44 are controlled by the transmission control unit TCU.

MR fluids 70 are filled in the interior of the shift wheels 41 and 42 with the flanges 33 and 34 of the control shaft 30. Seals 75 are provided on the outer circumferential surfaces of the flanges 33 and 34 and one end of the shift wheels 41 and 42 to prevent the MR fluid 70 from leaking to the outside of the shift wheels 41 and 42 .

The MR fluid (Magneto-rheological Fluid) 70 is made of a nano-sized iron powder and has a specific chemical coating such that its specific gravity is controlled to be similar to that of oil. In general, the MR fluid has a general oil property, Are arranged in a regular fashion to form a chain so that the oil is trapped between the chains and becomes hard as solid by the forces acting between the particles arranged. In other words, it usually shows the same behavior as the liquid, and when the magnetic field is applied, the viscosity gradually increases and finally the fluid shows the same characteristics as the solid.

Meanwhile, the actuator according to the present invention may further include an encoder 80 at the other end of the motor 10. The transmission control unit can accurately control the current supply of the motor 10 by detecting the rotation angle of the motor shaft 14 through the encoder 80. [

The function and effect of the present invention will now be described.

When the actuator according to the present invention is installed at a predetermined position of the transmission case, the shift fingers 41a, 42a, 51a, and 52a are inserted into the intermediate groove portions of the corresponding shift lugs 81, 82, 83, .

In this state, the shift control unit generates a magnetic field by supplying current to the solenoid coils (one of 43, 44, 53, and 54) corresponding to the gear positions to be shifted.

When a magnetic field is generated in the solenoid coil, the MR fluid 70 filled in the adjacent shift wheel 41, 42, 51, 52 is solidified.

Accordingly, the shift wheel and one of the flanges 33, 34, 31, 32 incorporated therein are integrated to fix the shift wheel to the control shaft 30. [ That is, the shift wheel is rotated integrally with the control shaft 30.

The transmission control unit is connected to the motor 10 in a state in which a single shift wheel to be shifted as described above, that is, one of the shift fingers 41a, 42a, 51a and 52a can be rotated integrally with the control shaft 30 And the shaft 14 is rotated to rotate the control shaft 60 in the same direction. At this time, the operation of the planetary gear set of the reduction gear cell 20 causes the rotation number and the torque of the motor 10 to rotate the control shaft 60 to a degree suitable for the shift operation.

When the control shaft 60 is rotated, the shift fingers are rotated integrally with the shift fingers, and the shift fingers push the shift lugs along the direction of rotation thereof. At this time, the shift forks are pushed in the same direction on the shift rails, .

5, the present invention is provided with a number of shift fingers 41a, 42a, 51a, and 52a that are the same as the number of shift lugs 81, 82, 91, and 92 so that the shift fingers 41a, 42a, 51a, 82, 91, 92, respectively, so that a separate select operation is not required before shifting during shifting. That is, the shift selector according to the operation of the shift lever of the driver ends only when the transmission control unit senses the operation of the shift lever, and there is no other select operation in the shift operating portion of the actual transmission.

Therefore, a malfunction due to a selection error is fundamentally prevented, accurate shifting is always performed, and an accurate shift is always performed.

As shown in FIG. 6, the flange 33 (only one of the flanges 33 is illustrated, but the same applies to all flanges) is provided with a plurality of The dog 33a can be protruded.

The dogs 33a are preferably formed in the shape of a rectangular parallelepiped.

When the MR fluid 70 is solidified by the dogs 33a, the binding force between the flange 33 and the shift wheel 41 is further doubled. Therefore, the shift wheel 41 is more firmly restrained to the control shaft 30, so that the rotation of the control shaft 30 can be accurately transmitted to the shift finger.

As described above, since shifting of all gear positions can be performed by one actuator, only one actuator can be mounted on the transmission, so that the structure of the transmission is simplified and the size is reduced.

In addition, since a large number of expensive BLDC motors are not used, the manufacturing cost is greatly reduced.

Also, since the conventional select solenoid for on / off operation is not used, the plunger impact noise is not generated during the select operation, so that the shift noise that causes discomfort does not occur. This advantage is even more prominent in hybrid and electric vehicles.

Also, since the actuator of the present invention has the same shift finger as the number of shift lugs and is matched with the shift lug on a one-to-one basis, a separate selecting operation is unnecessary. Therefore, accurate selection is always performed. As a result, malfunction due to a selection error does not occur as in the conventional art, thereby improving shift accuracy.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is understandable. Accordingly, the true scope of the present invention should be determined by the following claims.

10: motor 20: reduction gear cell
30: Control shaft 31, 32, 33, 34: Flange
40: Hall means shift control unit 50: Even-numbered shift control unit
41, 42, 51, 52: Shift wheel 41a, 42a, 51a, 52a:
43, 44, 53, 54: solenoid coil 60: control housing
70: MR fluid 75: Sealing
81,82,91,92: Shift lugs

Claims

A motor,
A reduction gear cell connected to the motor,
A control shaft connected to the reduction gear cell,
A shift finger installed on the control shaft and fixed in the rotation direction to the control shaft by the phase transition of the MR fluid;
And an actuator of the transmission.

The method according to claim 1,
Wherein the shift fingers are provided in the same number as the shift lugs and all the shift fingers are inserted into the shift lug intermediate groove portions of the corresponding speed change stages.

The method according to claim 1,
A flange protruding from the outer periphery of the control shaft, and a shift wheel surrounding the flange. The shift wheel can not move in the control housing surrounding the periphery of the control shaft along the axial direction of the control shaft, Wherein the MR fluid is filled in the inside of the shift wheel and the shift finger is integrally formed on the outer circumferential surface of the shift wheel.

The method of claim 3,
Wherein a solenoid coil is provided adjacent to the shift wheel, and a solenoid coil is mounted on the control housing.

The method of claim 3,
And a seal is provided on an outer peripheral surface of the flange and one end of the shift wheel.

The method of claim 3,
Wherein a plurality of rectangular parallelepiped block-shaped dogs are protruded and formed on the MR fluid contact surface of the flange.

The method according to claim 1,
Wherein the reduction gear cell comprises a sun gear mounted on one end of a shaft of the motor, a plurality of planetary gears meshed between the sun gear and a ring gear provided in the motor housing, and a carrier connecting the planetary gears, And the control shaft are formed integrally with each other.

The method according to claim 1,
Wherein the housing of the motor and the cover of the reduction gear cell are interlocked with each other, and the cover of the reduction gear cell is inserted and mounted in an actuator mounting portion formed in the transmission case.

The method of claim 8,
And the other end of the control shaft is inserted into a concentric guide portion provided in the transmission case.