Abstract: Provided is a discharge detector for detecting discharge occurred in a circuit with an electrically connected load based on a noise in a high frequency band superimposed on an alternating current power source supplied to the circuit.

Abstract: A negative-pressure-type booster includes: a booster shell attached to a support member of a vehicle; a front shell and a rear shell which constitute the booster shell; and, at the four corners of a flat part of the rear shell, linking bolts having affixed thereto protruding parts that each protrude rearward from the flat part, the protruding parts being passed through continuous connecting holes in the support member, the negative-pressure-type booster characterized in that the linking bolts are composed of upper linking bolts arranged to the upper side of the center axis of the booster shell and lower linking bolts arranged to the lower side of the center axis of the booster shell, the protruding part of either of the upper linking bolts extending farther rearward than the protruding part of the other upper linking bolt and the respective protruding parts of the lower linking bolts.

Abstract: A negative-pressure-type booster includes: a booster shell attached to a support member of a vehicle; a front shell and a rear shell which constitute the booster shell; and, at the four corners of a flat part of the rear shell, linking bolts having affixed thereto protruding parts that each protrude rearward from the flat part, the protruding parts being passed through continuous connecting holes in the support member, the negative-pressure-type booster characterized in that the linking bolts are composed of upper linking bolts arranged to the upper side of the center axis of the booster shell and lower linking bolts arranged to the lower side of the center axis of the booster shell, the protruding part of either of the upper linking bolts extending farther rearward than the protruding part of the other upper linking bolt and the respective protruding parts of the lower linking bolts.

Abstract: In a vacuum brake booster, a valve mechanism having a negative pressure valve which communicates and cuts off between a negative pressure chamber and a variable pressure chamber according to a retractable movement of the plunger with respect to a valve body, and an atmosphere valve which communicates and cuts off between the variable pressure chamber and the atmosphere is assembled in a shaft hole of a valve body. In addition, the plunger and the key member are assembled in the shaft hole. In addition, in the vacuum brake booster, when the valve body is in the forward moving position and the plunger is moved rearward from the forward moving position, a protrusion tilting and holding the key member with respect to the valve body is provided.

Abstract: To provide a negative pressure type booster device which has a high responsiveness even when a brake pedal is stepped on strongly and which is simplified and compact in construction. To this end, a passage 45 communicating directly with the atmosphere is provided between the internal surface of a sliding cylindrical portion 8b of a valve piston 8 and the external surface of a silencer 27, and the atmospheric air is enabled to be admitted from the passage 45 to a variable pressure chamber 6 directly without passing through the silencer 27 when an input member is advanced beyond a predetermined distance relative to the valve piston.

Abstract: An electric parking brake device comprises an electric motor, a conversion mechanism for converting a rotational drive force given by the electric motor into a linear drive force and a pair of cables (i.e., inner cables) connected to a pair of parking brakes, wherein the parking brakes are brought into a braking state when the cables are drawn in a drawing direction by the operation of the electric motor in a positive-going direction, but are brought into a release state when the cables are returned in a return direction by the operation of the electric motor in a reverse direction. Between the electric motor and the conversion mechanism, a clutch mechanism is provided for transmitting the rotation of the electric motor to the conversion mechanism, but for blocking the rotation transmission from the conversion mechanism toward the electric motor.

Abstract: A vacuum booster which moderates a retraction speed of a valve seat member to restrain a contact noise between a key member retracting in a unitary manner with the valve seat member and a flange surface of a plunger. The vacuum booster includes a noise restriction device.

Abstract: A negative pressure type booster includes a power piston, a slide valve, and a holding mechanism, among others, and assists a driver during emergency braking. The holding mechanism is adapted to hold the slide valve at a predetermined frontward position, and includes a latch member that is mounted to the power piston in such a manner as to be linearly movable in a radial direction, and a garter spring for biasing the latch member radially inward. The latch member has a hook that can be engaged with and disengaged from a hook provided on the slide valve. When a plunger moves frontward relative to the power piston by a quantity greater than a predetermined value, a push slope provided on the plunger pushes a passive slope provided on the latch member radially outward, whereby the hook of the latch member is disengaged from the hook of the slide valve.

Abstract: A vacuum booster which moderates a retraction speed of a valve seat member to restrain a contact noise between a key member retracting in a unitary manner with the valve seat member and a flange surface of a plunger. The vacuum booster includes a noise restriction device.

Abstract: A vacuum booster which moderates a retraction speed of a valve seat member to restrain a contact noise between a key member retracting in a unitary manner with the valve seat member and a flange surface of a plunger. The vacuum booster includes a noise restriction device.

Abstract: A negative pressure type brake hydraulic pressure generating device is proposed in which the stroke on the operating side can be set independently of the stroke on the output side. A slide resistance imparting means is provided between the fixed shell and a piston having a built-in control valve introducing atmospheric air to cancel the slide resistance which is the cause of increased stroke hysteresis of the piston, i.e. the slide resistance applied to the piston at airtight seal portions between the power plate and the piston.

Abstract: A negative pressure type booster includes a power piston, a slide valve, and a holding mechanism, among others, and assists a driver during emergency braking. The holding mechanism is adapted to hold the slide valve at a predetermined frontward position, and includes a latch member that is mounted to the power piston in such a manner as to be linearly movable in a radial direction, and a garter spring for biasing the latch member radially inward. The latch member has a hook that can be engaged with and disengaged from a hook provided on the slide valve. When a plunger moves frontward relative to the power piston by a quantity greater than a predetermined value, a push slope provided on the plunger pushes a passive slope provided on the latch member radially outward, whereby the hook of the latch member is disengaged from the hook of the slide valve.

Abstract: An object of this invention is to smoothen the operation and stabilize the output of a negative pressure type booster device for a hydraulic brake device of the stroke-independent type, in which the brake operating force is amplified using negative pressure of an engine and the master cylinder is actuated using the amplified force. Airtight sealing between a power piston and a valve piston which is axially movable relative to the power piston, and between a plunger coupled to an input shaft and the valve piston are carried out by rolling seals to prevent inaccurate movement of the valve piston, which tends to occur when such airtight sealing is carried out using slide seals.

Abstract: It is aimed to improve brake feeling of a negative pressure type brake hydraulic pressure generating device in which the stroke on the operating side can be set independently of the stroke on the output side. A spring for setting the stroke on the operating side is formed of coil springs arranged in series to impart the spring nonlinear characteristics, thereby biasing a piston, which can be moved axially relative to a power plate and includes a control valve for introducing atmospheric air, in the return direction.

Abstract: A negative pressure type brake hydraulic pressure generating device is proposed in which the stroke on the operating side can be set independently of the stroke on the output side. A slide resistance imparting means is provided between the fixed shell and a piston having a built-in control valve introducing atmospheric air to cancel the slide resistance which is the cause of increased stroke hysteresis of the piston, i.e. the slide resistance applied to the piston at airtight seal portions between the power plate and the piston.

Abstract: A vacuum booster which moderates a retraction speed of a valve seat member to restrain a contact noise between a key member retracting in a unitary manner with the valve seat member and a flange surface of a plunger. The vacuum booster includes a noise restriction device.