Brake booster coupling device

Patent metadata

Field	Value
Publication number	US-9573572-B2
Application number	US-201113048923-A
Country	US
Kind code	B2
Filing date	Mar 16, 2011
Priority date	Apr 9, 2010
Publication date	Feb 21, 2017
Grant date	Feb 21, 2017

Abstract

A brake booster coupling device includes: a braking piston, an input piston displaceable by an operation of a brake input element from its starting position by a driver braking distance, a force transmission between the input piston displaced by a driver braking distance below a predefined threshold value and the braking piston is suppressed, and a booster piston displaceable with the aid of the brake booster drive such that the braking piston, which contacts the booster piston, is displaceable with the aid of the brake booster drive from a non-braking position into a braking position; a contact element displaceable by a displacement of the braking piston from the non-braking position into the braking position such that a first contact surface of the contact element contacts a second contact surface of the input piston in such a way that a driver brake force is transmittable to the braking piston.

First claim

What is claimed is:

1. A brake booster coupling device, comprising:
a braking piston, which is at least partially displaceable in a brake master cylinder;
an input piston, which is situatable on a brake input element so that the input piston is displaceable in the event of an operation of the brake input element from its starting position by a driver braking distance in a direction toward at least one of the braking piston and the brake master cylinder, wherein a force transmission between the input piston, which is displaced by a driver braking distance below a predefined threshold value, and the braking piston is prevented;
a booster piston, which is situatable on a brake booster drive so that the booster piston is displaceable with the aid of the brake booster drive, at least in the case of a driver braking distance of the input piston below the predefined threshold value, so that the braking piston, which contacts the booster piston, is displaceable with the aid of the brake booster drive from a non-braking position into at least one braking position; and
a contact element, which is situated on the braking piston, and which is at least one of displaced and deformed in the event of a displacement of the braking piston from the non-braking position into the at least one braking position so that a first contact surface of the contact element is transferred in relation to the braking piston in a direction toward a second contact surface of the input piston, the second contact surface of the input piston, which is displaced by a driver braking distance greater than the threshold value, contacts the first contact surface of the contact element so that a driver brake force is transmitted from the input piston, which is displaced by the driver braking distance greater than the threshold value, via the contact element to the braking piston, which is present in a position range including the non-braking position and the at least one braking position.

2. The brake booster coupling device of claim 1 , wherein a spacing between the first contact surface and the second contact surface is a function of the driver braking distance.

3. The brake booster coupling device of claim 1 , wherein the spacing between the first contact surface and the second contact surface is independent of a relative distance of the input piston in relation to the booster piston.

4. The brake booster coupling device of claim 1 , wherein the brake booster coupling device includes said brake booster drive, which, at least in the case of a driver braking distance of the input piston below the predefined threshold value, is operable in a non-recuperation mode having a degree of recuperation equal to zero and in at least one recuperation mode having a degree of recuperation not equal to zero.

5. The brake booster coupling device of claim 4 , wherein the spacing between the first contact surface and the second contact surface is independent of a current degree of recuperation.

6. The brake booster coupling device of claim 1 , wherein the brake booster coupling device includes a pedal force partial simulator, which exerts a small constant simulator force in the case of a driver braking distance of the input piston between the starting position of the input piston and a limiting driver braking distance, and exerts a continuously increasing simulator force on the input piston in the case of a driver braking distance of the input piston between the limiting driver braking distance and the threshold value.

7. The brake booster coupling device of claim 6 , wherein the pedal force partial simulator exerts a continuously decreasing simulator force, which goes to zero, on the input piston in the case of a driver braking distance of the input piston from the threshold value.

8. The brake booster coupling device of claim 6 , wherein the pedal force partial simulator includes at least one roller, which is connected via a simulator spring to a housing, and which is guided along a path on the input piston during a displacement of the input piston from the starting position by the driver braking distance.

9. The brake booster coupling device of claim 8 , wherein a slope is definable as a quotient of a change of the path perpendicularly to an axis of the driver braking distance by a change of the path parallel to the axis of the driver braking distance, and the roller contacting a first section of the path having a small slope in the case of a driver braking distance of the input piston between the starting position of the input piston and the limiting driver braking distance, contacting a second section of the path having an increasing slope in the case of a driver braking distance of the input piston between the limiting driver braking distance and the threshold value, and/or contacting a third section of the path having a decreasing slope, which goes to zero, in the case of a driver braking distance of the input piston from the threshold value.

10. The brake booster coupling device of claim 1 , wherein the contact element includes a tappet which is displaceable in relation to the braking piston.

11. A regenerative brake system, comprising:
a brake booster coupling device, including:
a braking piston, which is at least partially displaceable in a brake master cylinder;
an input piston, which is situatable on a brake input element so that the input piston is displaceable in the event of an operation of the brake input element from its starting position by a driver braking distance in a direction toward at least one of the braking piston and the brake master cylinder, wherein a force transmission between the input piston, which is displaced by a driver braking distance below a predefined threshold value, and the braking piston is prevented;
a booster piston, which is situatable on a brake booster drive so that the booster piston is displaceable with the aid of the brake booster drive, at least in the case of a driver braking distance of the input piston below the predefined threshold value, so that the braking piston, which contacts the booster piston, is displaceable with the aid of the brake booster drive from a non-braking position into at least one braking position; and
a contact element, which is situated on the braking piston, and which is at least one of displaced and deformed in the event of a displacement of the braking piston from the non-braking position into the at least one braking position so that a first contact surface of the contact element is transferred in relation to the braking piston in a direction toward a second contact surface of the input piston, the second contact surface of the input piston, which is displaced by a driver braking distance greater than the threshold value, contacts the first contact surface of the contact element so that a driver brake force is transmitted from the input piston, which is displaced by the driver braking distance greater than the threshold value, via the contact element to the braking piston, which is present in a position range including the non-braking position and the at least one braking position; and

a generator.

12. The regenerative brake system of claim 11 , wherein the regenerative brake system includes a brake input element, and the input piston is displaceable with the aid of a small constant driver brake force on the brake input element from its starting position by a driver braking distance up to a limiting driver braking distance below the threshold value.

13. The regenerative brake system of claim 12 , wherein an increasing simulator force counteracts a further displacement of the input piston with the aid of the driver brake force on the brake input e

Assignees

• Overzier Frank
• Mayer Jochen
• Nagel Willi
• Goetzelmann Bernd
• Bosch Gmbh Robert

Inventors

• Overzier Frank
• Mayer Jochen
• Nagel Willi
• Goetzelmann Bernd

Classifications

• B60T13/575

  using resilient discs or pads · CPC title

• B60T11/18

  Connection thereof to initiating means · CPC title

• B60T1/10

  by utilising wheel movement for accumulating energy, e.g. driving air compressors · CPC title

• B60T7/042 Primary

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