KR20130066377A

KR20130066377A - Roller screw of electro-mechanical brake in vehicle

Info

Publication number: KR20130066377A
Application number: KR1020110133169A
Authority: KR
Inventors: 김종성
Original assignee: 현대모비스 주식회사
Priority date: 2011-12-12
Filing date: 2011-12-12
Publication date: 2013-06-20

Abstract

PURPOSE: A roller screw for the electric brake of a vehicle is provided to shorten assembly time for arranging the predetermined position arrangement of a roller by forming a jig hole and a roller central axis to correspond to each other one to one. CONSTITUTION: A roller screw for the electric brake of a vehicle comprises a nut member, a roller member(120), a spindle member(130), a jig(200), and a predetermined position installation unit(300). The nut member rotates through an external force and is equipped with a screw tread along the inner side with a circular locus. A plurality of roller members are inserted into the nut member. The roller member is equipped with the roller screw thread of a different pitch on the circumference of a central axis(124). The spindle member is inserted into the nut member and is equipped with a spindle screw thread(132) to be circumscribed with the roller member. The spindle member axially moves along with the rotation direction of the nut member. The jig is arranged with installation holes for corresponding to each central axis along a regular locus. The predetermined position installation unit is inserted into a predetermined position which corresponds to each central axis of the roller member.

Description

Roller screw for electric brake of vehicle {ROLLER SCREW OF ELECTRO-MECHANICAL BRAKE IN VEHICLE}

The present invention relates to a roller screw for an electric brake of a vehicle, and more particularly, to prevent assembly defects by preventing an incorrect assembly of a roller screw, and to prevent an increase in manufacturing cost through preventing assembly failure. It relates to a roller screw for an electric brake.

As the functions of the vehicle are diversified, the use of the spindle of the screw nut structure as an automotive component is increasing. The spindle of the screw nut structure is a representative mechanism for converting rotational motion into linear motion. For example, in the EPB (Electronic Parking Break), it is used to convert the rotational force of the motor into a linear pressing force.

In addition to systems that require self-locking, such as EPBs, electro-mechanical brakes (EMBs), smart boosters, dual or double clutch transmission (DCT), motor driving power steering (MDPS), and electric power steering (EPS) In order to maximize efficiency, spindle means are required. Ball screws or roller screws are used.

High-precision roller screw is difficult to be used as a vehicle part due to high unit price. It is used for small high-end machines such as machine tools. Usually, ball screw has been used as a vehicle part, but it is vulnerable to high loads, and the ball screw has a burden on unit cost. Increasingly, there is a growing interest in roller screws that can be manufactured at low cost due to low precision specifications.

The roller screw has a screw in the center and a plurality of rollers around the screw, and the nut on the outermost side makes the roller rotate and rotate when the screw rotates like a planetary gear. Delivered to the nut. When the rotational force of the nut is constrained, the nut moves linearly.

Background art of the present invention is disclosed in Republic of Korea Patent Publication No. 10-2010-0030012 (published March 18, 2010, the name of the invention: an electric brake device having a parking braking function using a gear).

The conventional EMB roller screw uses several rollers. Since the screw is screw-shaped and the plurality of rollers are arranged along the circumferential surface of the screw, they should not have the same shape and the pitch of the screw divided by the number of rollers. As the groove shape of the rollers should be offset (off-set), the order of the rollers to be assembled is an important matter, but it often causes assembly failure, and the increase of the assembly process to prevent this causes a cost increase. There is a problem.

Therefore, there is a need to improve this.

An object of the present invention is to provide a roller screw for an electric brake of a vehicle that is intended to prevent the assembly failure by preventing the assembly of the roller screw to improve the problems as described above.

In addition, the present invention can reduce the assembly time for the exact position of the roller by forming the hole of the separate jig provided to prevent the misassembly of the roller screw and the central axis of the roller in one-to-one correspondence to reduce the assembly time It is an object of the present invention to provide a roller screw for an electric brake of a vehicle to reduce the cost.

In addition, the present invention is to provide a directionality to the roller is inserted into the hole of the jig to smoothly engage the gears of the roller member and the spindle member in the assembled state, and assembling failure of the roller member and the nut member is smoothly made It is an object of the present invention to provide a roller screw for an electric brake of a vehicle to be prevented.

A roller screw for an electric brake of a vehicle according to the present invention includes: a nut member which is rotated by an external force and has an inner thread along an inner surface of a circular trajectory, and a plurality of nuts are inserted into the nut member and gear-coupled with the inner thread. A roller member having roller threads of different pitches on the circumferential surface of a central axis of the spindle member; a spindle member inserted into the nut member and externally provided to the roller member, the spindle member being moved axially in accordance with the rotational direction of the nut member; It includes a jig in which the installation holes corresponding to each of the central axis is arranged along a predetermined trajectory, and a fixed position installation portion for inserting each of the central axis of the roller member in the corresponding installation hole.

The in-situ mounting portion may include a cutting surface portion that is cut along the axial direction by a different volume on the circumferential surface of each of the roller members, and an inner surface of each of the installation holes of the jig to be interviewed with the corresponding cutting surface portion. It includes an interview support formed in different sizes.

The interview support portion is formed on the inner surface of each installation hole so as to interview the corresponding cut surface portion in a different direction.

The roller member may be rotatably supported by the cover member after being aligned in position by the jig.

The roller screw for the electric brake of the vehicle according to the present invention can prevent the assembly of the roller screw to prevent misassembly.

In addition, the present invention can reduce the assembly time for the exact position of the roller by forming the hole of the separate jig provided to prevent the misassembly of the roller screw and the central axis of the roller in one-to-one correspondence to reduce the assembly time Can reduce the cost.

In addition, the present invention is to provide a directionality to the roller is inserted into the hole of the jig to smoothly engage the gears of the roller member and the spindle member in the assembled state, and assembling failure of the roller member and the nut member is smoothly made You can prevent it.

1 is a perspective view of a roller screw for an electric brake of a vehicle according to an embodiment of the present invention.
Figure 2 is a perspective view of the nut member of the roller brake for electric brake of the vehicle according to an embodiment of the present invention.
3 is an exploded perspective view of a roller screw for an electric brake of a vehicle according to an embodiment of the present invention.
4 is a view illustrating a state in which a jig is used for positioning a roller member of a roller screw for an electric brake of a vehicle according to an embodiment of the present invention.
5 is a view illustrating a state in which the roller member position of the motorized brake roller screw of the vehicle according to an embodiment of the present invention is replaced with a cover member.
6 is a cross-sectional view of a roller screw for an electric brake of a vehicle according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of a roller screw for an electric brake of a vehicle according to the present invention. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a perspective view of a motorized brake roller screw of a vehicle according to an embodiment of the present invention, Figure 2 is a perspective view of the nut member of the motorized brake roller screw of a vehicle according to an embodiment of the present invention. 3 is an exploded perspective view of a roller screw for an electric brake of a vehicle according to an embodiment of the present invention.

4 is a view illustrating a state in which a jig is used to position a roller member of a roller screw for an electric brake of a vehicle according to an embodiment of the present invention, and FIG. 5 is an electric vehicle of a vehicle according to an embodiment of the present invention. Figure showing the state of replacing the cover member after setting the roller member position of the roller roller for the brake.

6 is a cross-sectional view of a roller screw for an electric brake of a vehicle according to an embodiment of the present invention.

1 to 3, the motorized brake roller screw 100 of the vehicle according to an embodiment of the present invention is connected to the output shaft 12 of the electric brake, the nut member 110 and the roller member 120. And a spindle member 130.

The nut member 110 is connected to an external force, in particular, the output shaft 12 of the electric brake is provided to be forced to rotate. Since the nut member 110 includes a roller member 120 and a spindle member 130 geared to each other inside, the inner surface is formed along a circular trajectory. Of course, the nut member 110 is preferably formed in a hollow cylindrical shape.

The nut member 110 has an inner thread 112 along the inner surface. The inner thread 112 has a constant pitch. The nut member 110 is applicable to various materials and does not limit the length in the axial direction.

In addition, a plurality of roller members 120 are provided inside the nut member 110. That is, the roller member 120 is axially inserted into the nut member 110 such that a plurality of roller members 120 are arranged along the circumferential trajectory inside the nut member 110. For convenience, the roller member 120 is shown to be provided with six. Of course, the number and length of the roller member 120 is not limited.

Then, the roller member 120 is provided with a roller screw thread 122 on the circumferential surface to be geared with the inner thread thread 112 of the nut member 110, respectively. At this time, each of the roller members 120 is made of different pitches (P1, P2, P3, P4, P5, P6). This is to guide the linear forward and backward transfer of the spindle member 130, the roller member 120 is rotated by receiving a rotational force from the nut member (110).

The spindle member 130 is axially inserted into the nut member 110. In particular, the spindle member 130 is preferably located in the center of the plurality of roller members 120 disposed along the circumferential trajectory. This is to allow the spindle member 130 to be geared at the same time as the entire roller member 120 so as to receive a stable rotational force. Accordingly, the spindle member 130 includes a spindle screw thread 132 to be circumscribed to the roller member 120.

Therefore, when the nut member 110 is rotated in one direction, the roller member 120 is rotated in one direction by receiving a rotational force, and thus, the spindle member 130 is rotated by the nut member 110 by the rotation of the roller member 120. Advance along the axial direction of).

On the contrary, when the nut member 110 is rotated in the other direction, the roller member 120 is rotated in the other direction by receiving a rotational force, and thus, the spindle member 130 is rotated by the nut member by the rotation of the roller member 120. Reverse along the axial direction of (110).

In particular, the roller member 120 made of different pitches (P1 ~ P6) should be disposed at a predetermined position along the circumferential direction of the spindle member (130). This is to ensure that each roller member 120 is smoothly geared to the spindle member 130 is transferred along the axial direction.

In one example, the roller member 120 is disposed in the clockwise direction in the order of the pitch of different P1, P2, P3, P4, P5, P6.

Accordingly, each of the roller members 120 should be disposed in place.

In addition, the roller member 120 is provided to be fixed to the position is inserted into the shaft inside the nut member (110). This is to receive the rotational force from the rotating nut member 110 to transfer the force to the spindle member 130 for linear movement.

For example, the nut member 110 includes a cover member 140 on both sides, and the cover member 140 supports the support hole 142 to rotatably support the central axis 124 of each of the roller members 120. Go through. That is, the central shaft 124 of each of the roller members 120 is rotated while being inserted into the support hole 142 of the cover member 140. At this time, the cover member 140 is fixedly installed on both sides of the nut member (110).

In addition, the cover member 140 passes through the insertion hole 144 to axially insert the spindle member 130. Thus, the spindle member 130 can be linearly reciprocated along the axial direction of the nut member 110 through the insertion hole 144.

In particular, as shown in Figs. 4 and 5, the jig 200 is used so that each of the roller members 120 having the roller threads 122 of different pitches is disposed in position in a directional set state.

First, each of the roller members 120 is disposed along the circumferential direction of the spindle member 130 with directivity such that the roller members 120 are correctly geared to the nut member 110 and the spindle member 130.

That is, the jig 200 arranges the installation holes 210 corresponding to the central axis 124 of each of the roller members 120 along a predetermined trajectory. For convenience, the jig 200 is illustrated as being formed in a disc shape, and may be modified in various shapes. In addition, as the roller member 120 is disposed along the circumferential direction of the spindle member 130, the installation hole 210 is disposed to be uniformly spaced along the circle trajectory in the jig 200.

Thus, the central shaft 124 of each of the roller members 120 is inserted into the installation hole 210 of the corresponding jig 200.

At this time, it is preferable that the operator can easily find and insert the central shaft 124 of each of the roller members 120 into the corresponding installation hole 210 of the jig 200.

Accordingly, in order to easily insert each of the central axis 124 of the roller member 120 into the corresponding installation hole 210 is provided with a fixed position installation portion 300.

In one example, the exact position installation portion 300 includes a cut surface portion 310 and the contact support 320.

In addition, the contact support 320 is formed on the inner surface of the installation hole 210 of the jig 200 to be in contact with the cut surface 310 when the corresponding central axis 124 is inserted into the installation hole 210.

Accordingly, the operator can assemble each of the roller members 120 in position along the circumferential direction of the spindle member 130.

In this case, the jig 200 may form a center hole 220 to axially insert the spindle member 130.

In addition, each of the roller members 120 is disposed at a fixed position along the circumferential direction of the spindle member 130.

That is, the cut surface portion 310 is formed by cutting in different directions on the circumferential surface of the central axis 124 of each of the roller members 120 arranged along a predetermined trajectory. That is, the cut surface portion 310 is formed on the circumferential surface of the central axis 124 of each of the roller members 120, and is formed to face different directions in each of the central axes 124 disposed along the circular trajectory.

Accordingly, each of the roller members 120 should be disposed in place.

Thus, the central axis 124 of the roller member 120 is preferably made to have the surface area of the end portion to each other so as to determine the arrangement order along the circumferential direction of the spindle member 130.

In particular, the end surface area of the neighboring central axis 124 is to be as much as possible so that the operator can easily determine the position of each of the roller member 120.

By way of example, the end surface areas of the central axis 124 are referred to as A1, A2, A3, A4, A5, A6 which are different from each other, and the end surface area of the central axis 124 is increased from A1 to A6.

Here, A1, A2, A3, A4, A5, and A6 refer to the end surface area cut by the cut surface portion 310 among the end surface areas of the central axes 124.

In addition, the end surface area of the central axis 124 of the roller member 120 having the pitch of P2 is A6, and the end surface area of the central axis 124 of the roller member 120 having the pitch of P6 is A5, The central surface 124 end surface area of the roller member 120 having a pitch is referred to as A4.

The end surface area of the central axis 124 of the roller member 120 having the pitch of P1 is A3, and the end surface area of the central axis 124 of the roller member 120 having the pitch of P3 is called A2. The central surface 124 end surface area of the roller member 120 having a pitch is referred to as A1.

Of course, the roller member 120 may be arranged along the circumferential direction of the spindle member 130 in order to have the end surface area of the central axis 124 gradually increasing.

In particular, the roller member 120 may be provided with different outer diameters. In this case, the nut member 110 preferably applies a gear that is deformed according to the position where the gear member is coupled to each of the roller members 120.

On the other hand, the roller member 120 is rotatably supported by the cover member 140 after being aligned in position by the jig 200.

In particular, the cover member 140 is fixedly installed inside the nut member 110 by various methods. This is to stably support the rotating roller member 120.

Looking at the assembly order of the electric brake roller screw 100 of the vehicle according to an embodiment of the present invention configured as described above are as follows.

First, the operator fixedly inserts the jig 200 inside one side of both inner sides of the nut member 110.

Then, one side of each roller member 120 is inserted into the corresponding installation hole 210 so that the cut surface portion 310 of each side of the central axis 124 is interviewed with the corresponding contact support 320. At this time, the cut surface portion 310 of each central axis 124 to have a direction to face in a different direction. In particular, all of the cut surfaces 310 of each of the central axes 124 face different directions, or some of them all face different directions. This allows the roller member 120 having the roller threads 122 of different pitches to be smoothly geared without shifting the spindle thread 132 of the spindle member 130 and the inner thread 112 of the nut member 110. For sake.

Thereafter, the worker fixedly inserts the cover member 140 inside the other side of the nut member 110.

At this time, the cover member 140 is rotatably inserted into the support hole 142, the other side of each of the central axis (124).

The operator inserts the spindle member 130 into the nut member 110 through the insertion hole 144 of the cover member 140 or the center hole 220 of the jig 200. Here, the spindle screw thread 312 is in a gear-coupled state with the roller screw thread 122, the spindle member 130 is axially inserted into the nut member 110 while being rotated in one direction.

After the spindle member 130 is completely inserted into the nut member 110, the operator removes the jig 200 and then inserts another cover member 140 into one side of the nut member 110. That is, the jig 200 is replaced with another cover member 140. Thus, both sides of the roller member 120 is rotatably supported by the cover member 140.

As a result, the operator can simply assemble the roller member 120 in place inside the nut member 110 through the jig 200.

Although not shown, the jig 200 may be detachably coupled to the inside of the nut member 110 like the cover member 140.

Looking at the operation of the electric brake roller screw 100 of the vehicle according to an embodiment of the present invention configured as described above are as follows.

As in FIG. 6, the roller screw 100 is connected to the output shaft 12 of the electric brake.

The operating element of the electric brake to which the output shaft 12 is connected consists of a roller screw 100 which pushes a piston (not shown) to the spindle member 130 so that the brake pad 14 is pressed against the brake disc 16.

A driven bevel gear 18 is connected to the outer circumference of the roller screw 100, and a drive bevel gear 20 engaged with the driven bevel gear 18 is provided at the output shaft 12, thereby providing a rotational force of the output shaft 12. It is a configuration that can be transferred to the roller screw 100 through the driving bevel gear 20 and the driven bevel gear (18).

In particular, the rotational force provided from the driving motor 24 is provided to the output shaft 12 through the planetary gear set 26 under the control of the motor controller 22, and together with the output shaft 12, the desired torque is desired at a desired time point. To be output, it is to be delivered to the roller screw (100).

The roller screw 100 includes a nut member 110, a roller member 120, and a spindle member 130, and the spindle member 130 linearly moves by a rotational force transmitted to the nut member 110 to move the piston. When the piston is pushed, the force pushed by the piston acts as a compressive force between the brake pad 14 and the brake disc 16 to obtain a braking force by the frictional force generated here.

At this time, the roller member 120 may be assembled in place inside the nut member 110 through the jig 200 having the installation holes 210 of different shapes.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill 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 appended claims. I will understand. Therefore, the true technical protection scope of the present invention will be defined by the claims below.

100: roller screw 110: nut member
112: inner thread 120: roller member
122: roller thread 124: central axis
130: spindle member 132: spindle thread
140: cover member 142: support hole
144: insertion hole 200: jig
210: installation hole 220: center hole
300: in situ mounting portion 310: cutting surface portion
320: interview support

Claims

A nut member rotated by an external force and having an inner thread along an inner surface of the circular trajectory;
A plurality of roller members inserted into the nut member and having roller threads of different pitches on the circumferential surfaces of the central shaft to be gear-coupled with the inner thread;
A spindle member inserted into the nut member and provided with a spindle thread so as to be external to the roller member, the spindle member being moved in an axial direction according to the rotation direction of the nut member;
Jig in which installation holes corresponding to each of the central axes are arranged along a predetermined trajectory; And
And a fixed position mounting portion for inserting each of the central shafts of the roller members into the corresponding mounting holes.

The method of claim 1, wherein the in-position mounting portion,
Cutting surface portions are formed by cutting along the axial direction by a different volume on the peripheral surface of the central axis of each of the roller members; And
And an interview support portion formed in different sizes on inner surfaces of each of the installation holes of the jig to be interviewed with the corresponding cut surface portions.

The method of claim 2,
The interview support portion is a motor-driven brake roller screw, characterized in that formed on the inner surface of each of the installation hole to interview the corresponding cut surface portion in a different direction.

3. The method according to claim 1 or 2,
And the roller member is rotatably supported by the cover member after the roller member is aligned in position by the jig.