Abstract: Provided is a vacuum pump mechanism capable of suppressing occurrence of needless drive torque. A suction port arranged at a housing is connected to a brake master back of a brake booster, and an oil regulating unit capable of adjusting a quantity of lubricating oil flowing through a lubricating oil supply passage when the brake master back reaches a predetermined negative pressure. Accordingly, when the brake master back reaches the predetermined negative pressure, the oil regulating unit adjusts the quantity of lubricating oil flowing through the lubricating oil supply passage to a reduced quantity or zero, whereby a load exerted by the lubricating oil to a vane and the like of a vacuum pump can be reduced than before. Therefore, occurrence of a needless drive torque at the vacuum pump can be suppressed.

Abstract: In an intake manifold of an internal combustion chamber comprising a surge tank assembly and intake pipe assembly, a seal member is interposed between the end surface of the intake pipe assembly and the mating surface of the surge tank assembly so as to seal off the intake passage and mounting holes individually. Thus, the seal member, combined with the use of the blind threaded holes for the threaded bolts joining the two parts, ensures the sealing of both the intake passages and mounting holes at the interface between the end surface of the intake pipe and the mating surface of the surge tank assembly in a both reliable and simple manner. Preferably, the seal member comprises an O-ring made of elastomeric material, and at least one of the mating surface and end surface is provided with a groove for receiving the seal member.

Abstract: In an intake manifold of an internal combustion chamber comprising a surge tank assembly and intake pipe assembly, a seal member is interposed between the end surface of the intake pipe assembly and the mating surface of the surge tank assembly so as to seal off the intake passage and mounting holes individually. Thus, the seal member, combined with the use of the blind threaded holes for the threaded bolts joining the two parts, ensures the sealing of both the intake passages and mounting holes at the interface between the end surface of the intake pipe and the mating surface of the surge tank assembly in a both reliable and simple manner. Preferably, the seal member comprises an O-ring made of elastomeric material, and at least one of the mating surface and end surface is provided with a groove for receiving the seal member.

Abstract: A pedal rod (12) connected to an accelerator pedal (10) has one end which is a free end. A friction generating device (20) is disposed at the free end of the pedal rod (12). The friction generating device (20) has a cylindrical housing (26) as a fixed friction member, a movable friction member (28) disposed movably in the interior of the housing (26) and kept in contact with the housing, and a friction member return spring (30) for urging the movable friction member (28) in a predetermined direction. When the accelerator pedal (10) is depressed, the free end of the pedal rod (12) pushes both movable friction member (28) and friction member return spring (30), so that there occur friction between the movable friction member (28) and the housing (fixed friction member) and friction induced by the friction member return spling (30). Upon release of the accelerator pedal (10), the movable friction member (28) is returned to its original position by the friction member return spring (30).