KR20110130007A

KR20110130007A - Power transmission structure for actuator of mdps

Info

Publication number: KR20110130007A
Application number: KR1020100049404A
Authority: KR
Inventors: 이주민
Original assignee: 현대모비스 주식회사
Priority date: 2010-05-27
Filing date: 2010-05-27
Publication date: 2011-12-05
Also published as: KR101612965B1

Abstract

PURPOSE: A power transmission structure for MDPS actuator is provided to secure proper power transmission speed by preventing the excessive compression of a rubber coupling. CONSTITUTION: A power transmission structure for MDPS actuator comprises first coupler protrusions(1), second coupler protrusions, and rubber couplings. The first coupler protrusions are located at the side of a motor. The second coupler protrusions are located at the side of a worm shaft. The first and second coupler protrusions are toward each other. The rubber couplings are inserted between the first and second coupler protrusions. Restriction protrusions(7) are installed in the first coupler protrusions and restrict the rotation of the second coupler protrusions.

Description

Power Transmission Structure for Actuator of MDPS

The present invention relates to a motor driven power steering (MDPS) actuator, and more particularly, to a power transmission structure between a motor and a worm shaft in an actuator.

1 illustrates a structure of a conventional electric power steering, which is coupled to a worm wheel 500 and the worm wheel 500 to provide a driving force by the motor 501 to the worm wheel 500. A worm shaft 502 is provided.

Between the motor 501 and the worm shaft 502 are provided with coupler protrusions protruding from each other so as to be inserted into each other, it is possible to transmit the rotational force to each other, the motor 501 side coupler protrusions 504 and the worm A rubber coupling 508 is provided between the coupler protrusions 506 at the shaft 502 side, and the coupler protrusions 504 at the motor 501 side and the coupler protrusions 506 at the worm shaft 502 side are provided. It is designed to soften power transmission and cushion shocks.

For example, as shown in FIG. 2, four coupler protrusions on the motor 501 side are provided on the rotation shaft of the motor 501, and a rubber coupling 508 is fitted as illustrated in FIG. 3. The worm shaft 502 side coupler protrusion 506 is fitted between the two coupling protrusions 510 of the rubber coupling 508 located between the two adjacent motor 501 side coupler protrusions.

However, when transmitting the rotational force of the motor 501 to the worm shaft 502, if the compression amount of the rubber coupling 508 is too large, the transmission speed of the power is slowed down, the response of the MDPS is lowered, excessive compression There is a problem in that the durability of the rubber coupling 508 is also reduced by the amount.

The present invention has been made to solve the problems as described above, while ensuring a smooth and smooth power transmission state between the motor and the worm shaft, while preventing excessive compression of the rubber coupling to ensure an appropriate level of power transmission speed of the MDPS An object of the present invention is to provide a power transmission structure of an MD actuator that can improve response and improve durability of a rubber coupling.

The power transmission structure of the present invention MD actuator for achieving the above object is

In the power transmission structure of an MD actuator having a motor side coupler protrusion and a worm shaft side coupler protrusion protruding to be alternately inserted toward each other, wherein a rubber coupling is inserted between the motor side coupler protrusion and the worm shaft side coupler protrusion,

One of the motor-side coupler projection and the worm shaft-side coupler projection is characterized in that it is provided with a limiting projection for limiting the relative amount of rotation with the adjacent coupler projection.

1 is a view showing the structure of a conventional MDPS actuator,
Figure 2 is a view showing a motor side coupler projection according to the prior art,
3 is a view illustrating a coupling relationship between a motor side coupler protrusion, a rubber coupling, and a worm shaft side coupler protrusion according to the prior art;
4 is a view showing an embodiment of a motor-side coupler projection as showing an embodiment of the present invention,
5 is a view illustrating a coupling relationship between the motor side coupler protrusion, the rubber coupling, and the worm shaft side coupler protrusion of FIG. 4.

4 and 5, the embodiment of the present invention includes a motor side coupler protrusion 1 and a worm shaft side coupler protrusion 3 protruding to be alternately inserted toward each other, and the motor side coupler protrusion and the worm shaft. In the power transmission structure of an MD actuator in which a rubber coupling 5 is inserted between the side coupler protrusions, either one of the motor side coupler protrusion 1 and the worm shaft side coupler protrusion 3 is adjacent to the other coupler protrusion. It is a structure provided with a limiting projection (7) for limiting the relative rotation amount of.

The limiting projection 7 is a structure protruding in both directions along the circumferential direction around the rotation axis of the motor and the worm shaft from one coupler projection toward the other adjacent coupler projection.

That is, in this embodiment, the one coupler protrusion is a motor side coupler protrusion 1, and the limiting protrusion 7 is formed integrally connected to both sides from the motor side coupler protrusion 1, and the motor side It has a structure formed to protrude in the circumferential direction along the outermost circumferential surface of the coupler protrusion (1), the other coupler projection is to be the worm shaft side coupler projection (3).

Of course, on the contrary, the one coupler protrusion is a worm shaft side coupler protrusion, and the limiting protrusion is integrally connected to both sides from the worm shaft side coupler protrusion, and the other coupler protrusion is configured as a motor side coupler protrusion. Embodiments are also possible.

In the present invention configured as described above, the rubber coupling 5 between the motor side coupler protrusion 1 and the worm shaft side coupler protrusion 3 is compressed only to a predetermined level, and the above limiting protrusion ( 7) will not be compressed.

That is, within the interval range of A shown in FIG. 5, the rubber coupling 5 is compressed and the power from the motor is buffered and transmitted to the worm shaft smoothly and stably, and, if the rubber coupling 5 When the force of the compression amount is greater than the interval of the A is transmitted, at this time, the limiting projection (7) is in direct contact with the worm shaft coupler projection (3) to transfer power, the excessive rubber coupling (5) Compression is prevented and smooth and rapid power transfer can be achieved.

Accordingly, as described above, the rubber coupling 5 is contracted only within a certain range, while maintaining the characteristic of buffering and transmitting the power from the motor smoothly and stably as before, while the rubber coupling 5 is excessive. When the force enough to be contracted is transmitted, the restricting protrusion 7 directly transmits power to the worm shaft side coupler protrusion 3, thereby securing a power transmission speed of a predetermined level or more, thereby improving the responsiveness of the MDPS. , It is possible to prevent the durability degradation due to excessive shrinkage of the rubber coupling (5).

One; Motor side coupler projection
3; Worm shaft side coupler protrusion
5; Rubber Coupling
7; Restriction

Claims

In the power transmission structure of an MD actuator having a motor side coupler protrusion and a worm shaft side coupler protrusion protruding to be alternately inserted toward each other, wherein a rubber coupling is inserted between the motor side coupler protrusion and the worm shaft side coupler protrusion,
Any one of the motor side coupler projection and the worm shaft side coupler projection is provided with a limiting projection for limiting the relative amount of rotation with the adjacent coupler projection.
Power transmission structure of the MD actuator.

The method according to claim 1,
The limiting projections protrude in both directions along the circumferential direction around the rotation axis of the motor and the worm shaft from one coupler projection toward the other adjacent coupler projection.
Power transmission structure of the MD actuator.

The method according to claim 2,
The limiting protrusion is formed to protrude in the circumferential direction along the outermost circumferential surface of the one coupler protrusion
Power transmission structure of the MD actuator.

The method according to claim 2,
The one coupler protrusion is a motor side coupler protrusion,
The limiting protrusion is integrally connected to both sides from the motor side coupler protrusion;
The other coupler projection is a worm shaft side coupler projection.
Power transmission structure of the MD actuator.

The method according to claim 2,
The one coupler protrusion is a warm shaft side coupler protrusion,
The restricting protrusion is integrally connected to both sides from the worm shaft side coupler protrusion;
The other coupler protrusion is a motor side coupler protrusion.
Power transmission structure of the MD actuator.