Reaction mechanism for booster
First Claim
1. In a booster including a valve body slidably disposed within a shell, a power piston mounted in the valve body, a constant pressure chamber and a variable pressure chamber defined across the power piston, a valve mechanism disposed in the valve body, an input shaft for driving a valve plunger, which forms at least a part of the valve mechanism, back and forth to switch a flow path in the valve mechanism, and an output shaft driven forward as the valve body is driven forward;
- a reaction mechanism for booster comprising a pseudoreaction imparting means which prevents a reaction applied to the output shaft from being transmitted to the valve plunger when the booster is operative and which imparts a pseudo-reaction which depends on a travel of the input shaft, andin which the pseudo-reaction imparting means comprises an elastic member which is disposed in the constant pressure chamber for urging the valve plunger rearward.
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Accused Products
Abstract
In accordance with the invention, a booster is not provided with a mechanism which transmits a braking reaction, and accordingly, a reaction cannot be transmitted to a brake pedal. On the other hand, a pseudo-reaction imparting means is provided to impart a pseudo-reaction which depends on an amount of depression of the brake pedal. The pseudo-reaction imparting means imparts a pseudo-reaction having a reduced rate of increase to the brake pedal when a travel of the brake pedal is small, and imparts a pseudo-reaction having an increased rate of increase to the brake pedal when a travel of the break pedal is higher. This arrangement avoids the drawback of the prior art that an abnormally high braking reaction is transmitted to a driver as a result of an operational lag of a conventional booster during a quick braking operation. The invention prevents such braking reaction from being transmitted to a driver, but enables a reaction of a required magnitude to be transmitted to the driver by means of pseudo-reaction imparting means. In this manner, a required high braking effort can be obtained with a reduced force of depression during a quick braking operation. The pseudo-reaction imparting means which exhibit such characteristic is capable of realizing an operation feeling, as experienced in a normal operation in the prior art, independently from a quick and a slow braking operation.
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Citations
3 Claims
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1. In a booster including a valve body slidably disposed within a shell, a power piston mounted in the valve body, a constant pressure chamber and a variable pressure chamber defined across the power piston, a valve mechanism disposed in the valve body, an input shaft for driving a valve plunger, which forms at least a part of the valve mechanism, back and forth to switch a flow path in the valve mechanism, and an output shaft driven forward as the valve body is driven forward;
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a reaction mechanism for booster comprising a pseudoreaction imparting means which prevents a reaction applied to the output shaft from being transmitted to the valve plunger when the booster is operative and which imparts a pseudo-reaction which depends on a travel of the input shaft, and in which the pseudo-reaction imparting means comprises an elastic member which is disposed in the constant pressure chamber for urging the valve plunger rearward. - View Dependent Claims (2, 3)
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Specification