| 摘要 |
PROBLEM TO BE SOLVED: To provide a drum brake device which can reduce effectively occurrence of a breaking squeak. SOLUTION: A drum brake device 10 has a rim 18, to which a bonding agent 60 for adhering a brake lining 24 is applied at certain intervals. If a first brake shoe 16 vibrates in resonance to a braking squeak, a friction is generated between the rim 18 and lining 24 in the portions free of application of the bonding agent, and by this friction the vibratory energy is converted into thermal energy to cause reduction of the vibration. Because the bonding agent application area is made different about the boundary lying approximately in the center of the rim 18 which corresponds to the node of the secondary vibration as the chief vibration in resonance, the rate of vibratory-thermal conversion of the energy differs between one end and the other about approximate the center of the rim 18 as boundary. Therefore, the secondary vibration becomes irregular, and the braking squeak can be reduced effectively.
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