Electric booster for vehicle

Patent metadata

Field	Value
Publication number	US-11511723-B2
Application number	US-202016934287-A
Country	US
Kind code	B2
Filing date	Jul 21, 2020
Priority date	Aug 5, 2019
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

An electric booster for a vehicle including: a disc holder accommodating a reaction disc, a screw nut rotated in conjunction with an operation of a motor, a screw bolt linearly moved in conjunction with a rotation of the screw nut, a boosting block disposed between the reaction disc and the screw bolt, and contacting a radially outer portion of the reaction disc when the screw bolt moves, a pedal rod contacting a radially central portion of the reaction disc through the screw bolt and the boosting block, a disc holder pressing hole connected to the screw bolt, and disposed to face the disc holder, and a first breakage prevention gap part formed between the disc holder and the disc holder pressing hole.

First claim

What is claimed is:

1. An electric booster for a vehicle comprising:
a reaction disc;
a disc holder accommodating the reaction disc;
a screw nut rotatable in conjunction with an operation of a motor;
a screw bolt configured to be linearly moved toward the reaction disc in conjunction with a rotation of the screw nut;
a boosting block disposed between the reaction disc and the screw bolt, and in contact with a radially outer portion of the reaction disc in response to movement of the screw bolt;
a pedal rod extending through the screw bolt and the boosting block and contacting a radially central portion of the reaction disc;
a disc holder pressing part connected to the screw bolt, and facing the disc holder; and
a first breakage prevention gap part formed between the disc holder and the disc holder pressing hole at a first set width, and configured to limit an amount of elastic deformation in the reaction disc by the boosting block to the first set width or less,
wherein the boosting block comprises:
a bolt inner diameter coupling part fitted into an inner diameter portion of the screw bolt; and
a disc outer pressing part connected to the bolt inner diameter coupling part, disposed to face the radially outer portion of the reaction disc outside the screw bolt, and configured to press the radially outer portion of the reaction disc at the first set width when the disc holder pressing hole is in contact with the disc holder.

2. The electric booster for the vehicle of claim 1 , wherein the disc holder comprises:
a disc accommodating part having a more expanded diameter than that of the reaction disc, the disc accommodating part being formed to extend in a moving direction of the screw bolt and accommodate the reaction disc;
a piston pressing part consecutively formed at one side of the disc accommodating part, and in contact with a piston; and
a connection opening part formed to be opened to the other side of the disc accommodating part, and forming a passage through which the boosting block and the pedal rod are inserted into the disc accommodating part.

3. The electric booster for the vehicle of claim 2 , wherein the disc holder further comprises a pressing stabilizing part formed to protrude radially from an end of the disc accommodating part, and facing the disc holder pressing part together with the end of the disc accommodating part.

4. The electric booster for the vehicle of claim 3 , wherein the disc holder further comprises an elastic member assembling part formed to be stepped at a bounder portion between the disc accommodating part and the pressing stabilizing part, and into which an elastic member for returning the reaction disc to an initial location is fitted and locked.

5. The electric booster for the vehicle of claim 1 , wherein the boosting block further comprises a boosting transfer locking part formed to be stepped at a boundary portion between the bolt inner diameter coupling part and the disc outer pressing part, and locked to an end of the screw bolt.

6. The electric booster for the vehicle of claim 1 , wherein the disc holder pressing part comprises:
a bolt outer diameter coupling part coupled to an outer diameter portion of the screw bolt; and
a holder pressing part formed to extend radially from the bolt outer diameter coupling part, the holder pressing part having a more expanded diameter than that of the reaction disc, disposed to face the disc holder, and being in contact with the disc holder when the amount of elastic deformation in the radially outer portion of the reaction disc reaches the first set width.

7. An electric booster for a vehicle comprising:
a reaction disc;
a disc holder accommodating the reaction disc;
a screw nut rotatable in conjunction with an operation of a motor;
a screw bolt configured to be linearly moved toward the reaction disc in conjunction with a rotation of the screw nut;
a boosting block disposed between the reaction disc and the screw bolt, and in contact with a radially outer portion of the reaction disc in response to movement of the screw bolt;
a pedal rod extending through the screw bolt and the boosting block and contacting a radially central portion of the reaction disc;
a disc holder pressing part connected to the screw bolt, and facing the disc holder;
a first breakage prevention gap part formed between the disc holder and the disc holder pressing hole at a first set width, and configured to limit an amount of elastic deformation in the reaction disc by the boosting block to the first set width or less;
a jump-in gap part formed between the reaction disc and the pedal rod at a second set width; and
a second breakage prevention gap part formed between the boosting block and the pedal rod at a third set width, and configured to limit the amount of elastic deformation in the reaction disc by the pedal rod to a value equal to or less than a fourth set width corresponding to a difference between the second set width and the third set width.

8. The electric booster for the vehicle of claim 7 , wherein the boosting block comprises:
a bolt inner diameter coupling part coupled to be slidable to an inner diameter portion of the screw bolt, and facing the pedal rod;
a disc outer pressing part connected to the bolt inner diameter coupling part, and disposed to face the radially outer portion of the reaction disc outside the screw bolt; and
a rod guide hole part formed through the bolt inner diameter coupling part and the disc outer pressing part, and configured to guide a movement of the pedal rod.

9. The electric booster for the vehicle of claim 8 , wherein the pedal rod comprises:
a boosting block pressing part having a more expanded diameter than that of the rod guide hole part, the boosting block pressing part being disposed inside the screw bolt and disposed to face the bolt inner diameter coupling part at a separation interval corresponding to the third set width; and
a disc central pressing part connected to the boosting block pressing part, extending toward the reaction disc through the rod guide hole part, and spaced apart from the reaction disc at a separation interval corresponding to the second set width.

10. An electric booster for a vehicle comprising:
a reaction disc;
a disc holder accommodating the reaction disc;
a screw nut rotatable in conjunction with an operation of a motor;
a screw bolt configured to be linearly moved toward the reaction disc in conjunction with a rotation of the screw nut;
a boosting block disposed between the reaction disc and the screw bolt, and configured to be in contact with a radially outer portion of the reaction disc when the screw bolt moves;
a pedal rod extending through the screw bolt and the boosting block and contacting a radially central portion of the reaction disc;
a disc holder pressing part connected to the screw bolt and facing the disc holder;
a jump-in gap part formed between the reaction disc and the pedal rod at a second set width; and
a second breakage prevention gap part formed between the boosting block and the pedal rod at a third set width, and configured to limit the amount of elastic deformation in the reaction disc by the pedal rod to a value equal to or less than a fourth set width corresponding to a difference between the second set width and the third set width.

11. The electric booster for the vehicle of claim 10 , wherein the boosting block comprises:
a bolt inner diameter coupling part coupled to be slidable to an inner diameter portion of the screw bolt, and facing the pedal rod;
a disc outer pressing part connected to the bolt inner diameter coupling part, and facing the radially outer portion of the reaction dis

Assignees

• Hyundai Mobis Co Ltd

Inventors

• Yun Seung Hyun

Classifications

• F16H25/20

  Screw mechanisms (with automatic reversal F16H25/12) · CPC title

• B60T13/745 Primary

  acting on a hydraulic system, e.g. a master cylinder · CPC title

• B60T7/042

  by electrical means, e.g. using travel or force sensors · CPC title

• B60T13/746 Primary

  and mechanical transmission of the braking action · CPC title

• F16D65/62

  self-acting in both directions for adjusting excessive and insufficient play · CPC title