Electromechanical brake for vehicle

Patent metadata

Field	Value
Publication number	US-10060488-B2
Application number	US-201615365317-A
Country	US
Kind code	B2
Filing date	Nov 30, 2016
Priority date	May 4, 2016
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

An electromechanical brake includes a piston installed in a caliper housing so as to be movable forward and backward in an axial direction, and moves forward in the axial direction at the time of performing a braking operation so as to press a friction pad provided to clamp a disc; an actuator which provides rotational force for moving the piston; a spindle which is thread-coupled to the piston, and rotates by rotational force transmitted from the actuator to move the piston forward and backward in the axial direction; and a guide member which is provided to be integrally fixed to the caliper housing and coupled to the piston so as to restrict rotation of the piston and guide forward and backward axial movement of the piston, in which the guide member has a support portion which is coupled to the spindle and supports the spindle in the axial direction.

First claim

What is claimed is:

1. An electromechanical brake comprising:
a piston installed in a caliper housing so as to be movable forward and backward in an axial direction, and moves forward in the axial direction at the time of performing a braking operation so as to press a friction pad provided to clamp a disc;
an actuator which provides rotational force for moving the piston;
a spindle which is thread-coupled to the piston, and rotates by rotational force transmitted from the actuator so as to move the piston forward and backward in the axial direction; and
a guide member which is provided to be integrally fixed to the caliper housing and coupled to the piston so as to restrict rotation of the piston and guide forward and backward axial movement of the piston,
wherein the guide member is located outside the spindle,
wherein the guide member has a shape that accommodates and surrounds the piston, and
wherein a coupling portion, which is supported in the axial direction by a support portion of the guide member, is formed on the spindle, and the coupling portion has a shape extending and protruding in a radial direction from the spindle.

2. The electromechanical brake of claim 1 , wherein transverse cross sections of joint surfaces of the guide member and the piston are shaped so that the guide member restricts the rotation of the piston.

3. The electromechanical brake of claim 1 , wherein a protrusion is formed on the guide member, and a groove into which the protrusion is inserted is formed in the piston so as to be elongated in a longitudinal direction of the piston, such that the guide member restricts the rotation of the piston and the forward and backward axial movement of the piston is guided in a state in which the protrusion is inserted into the groove.

4. The electromechanical brake of claim 1 , wherein a protrusion is formed on the piston, and a groove into which the protrusion is inserted is formed in the guide member so as to be elongated in a longitudinal direction of the guide member, such that the guide member restricts the rotation of the piston and the forward and backward axial movement of the piston is guided in a state in which the protrusion is inserted into the groove.

5. The electromechanical brake of claim 1 , wherein the piston and the spindle are installed in a hollow cylinder formed in the caliper housing, and the guide member is coupled and fixed to the caliper housing in an assembled manner so as not to rotate in the cylinder.

6. The electromechanical brake of claim 5 , wherein a protrusion or a groove is formed on an outer surface of the guide member, and a groove or a protrusion, which is coupled to the protrusion or the groove and has the opposite shape, is formed in an inner surface of the cylinder of the caliper housing so that the guide member does not rotate in the cylinder of the caliper housing.

7. The electromechanical brake of claim 5 , wherein a through hole is formed in the caliper housing, and a housing through portion, which is penetratively coupled to the through hole, is formed on the guide member so that the guide member does not rotate in the cylinder of the caliper housing, such that the rotation of the guide member is prevented in a state in which the housing through portion is penetratively coupled to the through hole.

8. The electromechanical brake of claim 7 , wherein a plurality of housing through portions is formed on the guide member, a catching portion is formed at an end portion of each of the housing through portions positioned outside the caliper housing, and a ring member is installed between the catching portions of the housing through portions and an outer surface of the caliper housing so as to prevent the guide member from being separated from the caliper housing.

9. The electromechanical brake of claim 1 , wherein the piston and the spindle are installed in a hollow cylinder formed in the caliper housing, and the guide member is integrally formed on an inner surface of the cylinder.

10. The electromechanical brake of claim 9 , wherein a housing cover for sealing is fixedly installed at an opening portion of the caliper housing which is made to form the guide member integrally with the inner surface of the cylinder of the caliper housing.

11. The electromechanical brake of claim 1 , wherein the support portion of the guide member includes:
an accommodating portion, which has a shape that accommodates the coupling portion of the spindle, is formed on the guide member, and supports, at the front side of the coupling portion, the coupling portion of the spindle accommodated in the accommodating portion; and
a bearing which is installed, inside the accommodating portion of the guide member, between the coupling portion of the spindle and an inner surface of the caliper housing in the rear of the coupling portion, and supports the coupling portion of the spindle so that the coupling portion is rotatable inside the caliper housing at the rear side of the coupling portion.

12. The electromechanical brake of claim 1 , wherein the guide member has a support portion which is coupled to the spindle and supports the spindle in the axial direction.

13. The electromechanical brake of claim 12 , wherein a coupling portion, which is supported in the axial direction by the support portion of the guide member, is formed on the spindle, and the coupling portion has a shape extending and protruding in a radial direction from the spindle.

14. The electromechanical brake of claim 13 , wherein the support portion of the guide member includes:
an accommodating portion, which has a shape that accommodates the coupling portion of the spindle, is formed on the guide member, and supports, at the front side of the coupling portion, the coupling portion of the spindle accommodated in the accommodating portion; and
a bearing which is installed, inside the accommodating portion of the guide member, between the coupling portion of the spindle and an inner surface of the caliper housing in the rear of the coupling portion, and supports the coupling portion of the spindle so that the coupling portion is rotatable inside the caliper housing at the rear side of the coupling portion.

15. The electromechanical brake of claim 1 , wherein the piston includes:
a piston member which is a part for pressing the friction pad; and
a nut member which is integrally coupled to the piston member so as to be movable forward and backward in the axial direction and thread-coupled to the spindle, and converts rotational force of the spindle into translational force for the forward and backward axial movement.

16. The electromechanical brake of claim 15 , wherein the piston member has a hollow portion formed in the axial direction, the nut member is inserted and coupled into the hollow portion of the piston member, and a surface of a tip portion of the nut member, which is inserted into the hollow portion of the piston member, and an inner surface of the hollow portion of the piston member, which abuts on the surface of the tip portion of the nut member, are formed as curved surfaces, such that the nut member and the piston member are in contact with each other through the curved surfaces.

17. The electromechanical brake of claim 15 , wherein the piston member has a hollow portion formed in the axial direction, the nut member is inserted and coupled into the hollow portion of the piston member, and a spring, which provides elastic restoring force in a direction in which a tip portion of the nut member comes into contact with an inner surface of the hollow portion of the p

Assignees

• Hyundai Motor Co Ltd
• Hyundai Mobis Co Ltd

Inventors

• Lee Joung Hee
• Hyun Dong Yoon
• Jeong Jong Yun
• Kim Jong Sung
• Kwon Yong Sik

Classifications

• F16D2125/06

  Pistons · CPC title

• F16D65/18

  adapted for drawing members together {, e.g. for disc brakes} · CPC title

• F16D55/226 Primary

  in which the common actuating member is moved axially {, e.g. floating caliper disc brakes} · CPC title

• F16D2125/40

  Screw-and-nut · CPC title

• F16D2121/24

  using motors · CPC title