Patent ID: 6361127
Filing Date: 2002-03-26
Classification: B60T

Abstract:
An automatic brake unit comprising a brake booster, a brake pedal for driving and operating an input shaft of the brake booster when depressed, the brake pedal and input shaft being coupled together to allow relative movement between each other in a predetermined range between a most advanced position and a most retracted position, a detection switch for detecting the operation of the brake booster without the depression of the brake pedal provided on one of the input shaft and the brake pedal, an operating member for operating the detection switch provided on the other of the input shaft and the brake pedal, a first spring for biasing the input shaft forward relative to the brake pedal and a brake return spring provided in the brake booster for biasing the input shaft rearward, the biasing force of the first spring being less than the biasing force of the brake return spring, wherein the brake pedal is provided at the most advanced position when depressed and when the input shaft advances forwardly relative to the brake pedal in response to operation of the automatic brake operating mechanism, the detection switch is operated by the operating member and detects the operation of the brake booster.