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Electromechanical actuator for a vehicle brake with increased service life

A technology for actuators and brakes, which is applied in the field of electromechanical actuators and drum brakes, and can solve problems such as motor aging and damage to actuators

Pending Publication Date: 2022-02-22
日立安斯泰莫法国公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Repeated force rises of the nut against the stop during the entire operating life of the brake may damage the components of the actuator and in particular may lead to premature aging of the motor

Method used

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  • Electromechanical actuator for a vehicle brake with increased service life
  • Electromechanical actuator for a vehicle brake with increased service life
  • Electromechanical actuator for a vehicle brake with increased service life

Examples

Experimental program
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Effect test

no. 1 example

[0043] According to a first embodiment of the invention, the electromechanical actuator 6 comprises a spring, for example a helical spring 26 extending over a part of the threaded rod 17 from a first end of the spring attached to the fixed stop 23 to the The second end, the second end extends at a distance from the fixed stop 23, such as figure 2 shown. In this solution, when the nut 16 translates towards the fixed stop 23, bearing against the second end of the spring, the spring is clamped between the fixed stop and the nut and exerts a force against the advancement of the nut.

[0044] With this arrangement, the measured intensity In is substantially constant until the nut 16 contacts the second end of the spring, this level of advancement of the nut being denoted Xe. When the nut continues to move towards the fixed stop 23 , the current In drawn by the motor 12 increases to counteract the resistance of the nut going forward.

[0045] exist figure 2 In the example shown...

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PUM

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Abstract

The invention relates to an electromechanical actuator (6) for a motor vehicle brake, comprising an electric motor (12) absorbing a nominal rated current (In), a screw-and-nut movement converter (14) including a screw (17) with an an axis (AX) extending in a longitudinal direction and a nut (16) supported by the screw (17), and comprising at least one means (26) for varying the resistance to forward motion in the longitudinal direction of an element being transferred between the nut and the screw at a predetermined position, in order to modify the nominal rating (In) of the current flowing through the motor (12) while the element is being transferred to the predetermined position.

Description

technical field [0001] The invention relates to the field of motor vehicle brakes of the electromechanical type, and more precisely to electromechanical actuators for vehicle brakes. The invention also relates to drum brakes, in particular drum brakes with electromechanical actuators for parking brake applications. Background technique [0002] In vehicle brakes of the electromechanical type, it is known to electrically activate the selective movement of the shoes carrying the friction linings. The movement of the shoe between the braking position and the rest position is controlled by an electromechanical actuator in which the friction lining bears against a rotating surface rotatably connected to the wheel of a vehicle equipped with brakes , in the rest position the friction lining extends away from the rotating surface. [0003] The electromechanical actuator includes an electric motor controlled by a computer that regulates the current drawn by the electric motor, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16D65/18F16D66/00B60T13/74F16D121/24F16D125/40
CPCF16D65/18B60T13/741F16D2121/24F16D2066/003F16D2125/40
Inventor 杰勒德·卢克里斯托弗·迪帕阿尔贝托·默里纳罗锡德里克·贵格农马克·阿亚什
Owner 日立安斯泰莫法国公司
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