Smart braking devices, systems, and methods

Patent metadata

Field	Value
Publication number	US-9939035-B2
Application number	US-201615167883-A
Country	US
Kind code	B2
Filing date	May 27, 2016
Priority date	May 28, 2015
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

Various braking devices, systems, and methods are disclosed. In some embodiments, the braking device includes a support element, a block of friction material supported by the support element, at least one piezoceramic sensor supported by the support element and interposed between the block of friction material (and the support element, and a protective element located at the piezoceramic sensor and embedding the latter. The protective element can have one or more layers of resin-based material applied to protect the piezoceramic sensor and direct a predetermined part of the external compression force onto an area of the support element surrounding the piezoceramic sensor. In some embodiments, a signal transduction device is provided and includes at least one piezoceramic sensor supported on a support element and has an integral protective coating having properties of mechanical and temperature resistance.

First claim

The following is claimed:

1. A braking device for vehicles, comprising:
a support element;
a block of friction material supported by the support element; and
at least one piezoceramic sensor supported by the support element and interposed between the block of friction material and the support element,
wherein the support element supports at least one protective element that encloses the at least one piezoceramic sensor, and
wherein the at least one protective element exhibits mechanical properties adapted to maintain the at least one piezoceramic sensor below its maximum load condition when an external compression force exceeding 400 kg/cm 2 is applied to integrate the block of friction material on the support element.

2. The braking device for vehicles of claim 1 , wherein the protective element is made of an electrically insulating material.

3. The braking device for vehicles of claim 2 , wherein the protective element is configured to direct the external compression force onto an area of the support element surrounding the at least one piezoceramic sensor.

4. The braking device for vehicles of claim 1 , wherein the protective element has a thermal shield that thermally insulates the at least one piezoceramic sensor.

5. The braking device for vehicles of claim 4 , wherein the thermal shield is provided by at least one of a thermally insulating layer of the protective element or a thermally insulating element accommodated inside the protective element.

6. The braking device for vehicles of claim 1 , wherein the support element supports an electrically insulated electrical circuit that has electrical contacts to which electrodes of the at least one piezoceramic sensor are connected and receive an electrical signal emitted by the at least one piezoceramic sensor.

7. The braking device for vehicles according to claim 6 , wherein the electrically insulated electrical circuit is screen printed on the support element and has contacts connected to the electrodes by a high temperature welding paste.

8. The braking device for vehicles of claim 1 , wherein the block of friction material, the piezoceramic sensor and the protective element exhibit a linear elastic behaviour with elastic constants in a direction of the external compression force (F) applied to the block of friction material,
wherein the protective element experiences a resultant force (F′) that is different from the external compression force (F) applied to the block of friction material,
wherein the resultant force (F′) is transmitted to the piezoceramic sensor such that the at least one piezoceramic sensor experiences a final force (F p ), and
wherein the elastic constant of the block of friction material, the piezoceramic sensor and the protective element are selected such that a ratio of the final force and the external compression force (F p /F) is not less than 0.1.

9. The braking device for vehicles of claim 1 , wherein the protective element exhibits mechanical properties such that the force transmitted to the piezoceramic sensor is limited when the external compression force is applied on the block of friction material.

10. The braking device for vehicles of claim 1 , wherein the at least one piezoceramic sensor lies in a raised arrangement on the support element, and
wherein the protective element comprises:
a shell having an internal contact surface that is engaged with the external surface of the piezoceramic sensor, and
a base on the support element.

11. The braking device for vehicles of claim 1 , wherein the protective element is dome-shaped.

12. The braking device for vehicles of claim 1 , wherein the protective element is made up of a material comprising a resin or a ceramic material.

13. The braking device for vehicles of claim 1 , further comprising at least one thermally insulating layer covering the support element, whereon the at least one piezoceramic sensor is arranged.

14. The braking device for vehicles of claim 1 , further comprising a damping layer interposed between the block of friction material and the support element.

15. A vehicle comprising at least one braking device of claim 1 .

Assignees

• Itt Italia Srl

Inventors

• Donzelli Daniele
• Solari Mattia
• Terranova Marco
• Serra Stefano
• Martinotto Luca

Classifications

• G01L1/16

  using properties of piezoelectric devices · CPC title

• F16D66/021 Primary

  using electrical detection or indication means · CPC title

• F16D2066/006

  without direct measurement of the quantity monitored, e.g. wear or temperature calculated form force and duration of braking · CPC title

• F16D65/092

  for axially-engaging brakes, e.g. disc brakes · CPC title

• F16D2066/005

  Force, torque, stress or strain · CPC title