Friction pad for disk brake with wear sensor

• US 5,520,265 A
• Filed: 11/29/1994
• Issued: 05/28/1996
• Est. Priority Date: 11/29/1993
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Tokico Limited (Hitachi, Ltd.)
• Inventors: Kobayashi, Kinzo, Suzuki, Shinji, Tokunaga, Takahiro
• Primary Examiner(s): Graham, Matthew C.
• Assistant Examiner(s): Poon, Peter M.
• Application Number:
  US08/350,157
• Time in Patent Office: 546 Days
• Field of Search: 188/1.11 R, 188/1.11 W, 188/73.1, 188/73.31, 188/250 G, 188/250 B, 188/258, 29/509, 29/522.1, 29/524.1
• US Class Current: 188/1.11W
• CPC Class Codes: F16D 66/02 Apparatus for indicating wear
• CPC Class Codes: Y10T 29/49943 Riveting

Abstract

A friction pad for a disk brake is designed so that a wear sensor can be firmly secured to the friction pad. A circular cylindrical projection is formed on a backing plate of the friction pad by extrusion so that a wear sensor adapted to sound an alarm by coming in contact with a disk is fitted onto the projection and secured to the backing plate by caulking the projection. The projection is so deformed that the diameter d₁ and height h₁ of a resulting radially enlarged portion satisfy the relationship of (d₁ -3.4)×h₁ ≧2.5, thereby preventing rotation of the wear sensor and rising of the enlarged portion.

Claims

1. A friction pad for a disk brake, said friction pad comprising:

a backing plate and a lining material joined thereto;

said backing plate having formed thereon by extrusion a circular cylindrical projection;

a wear sensor fitted onto said projection and adapted to generate an alarm upon contacting a disk of the disk brake;

said wear sensor being secured to said backing plate by a radially enlarged portion of said projection resulting from plastic deformation thereof; and

said radially enlarged portion having a diameter (d₁) and a height (h₁) satisfying the relationship (d₁ -3.4)×

h₁ ≧

2.5 mm.

2. A friction pad as claimed in claim 1, wherein said wear sensor has a mounting portion clamped between said radially enlarged portion and said backing plate, and said mounting portion has a toughened surface on a side thereof facing said radially enlarged portion.

3. A friction pad as claimed in claim 2, wherein said radially enlarged portion has a projecting portion extending from said radially enlarged portion toward said backing plate.

4. A friction pad as claimed in claim 3, wherein said projecting portion bites into said mounting portion of said wear sensor.

5. A friction pad as claimed in claim 1, wherein said radially enlarged portion has a projecting portion extending from said radially enlarged portion toward said backing plate.

6. A friction pad as claimed in claim 5, wherein said projecting portion bites into said wear sensor.