49results about How to "Suppress abnormal noise" patented technology

The invention provides a control device of automatic gearbox, which can be used in an oil pressure control of lock-up clutch during speed change, thereby preventing oil pressure reduction caused by speed change prepration pressure, and appropriately adjusting oil pressure in required area for the lock-up clutch, and not only inhibiting slipping of the lock-up clutch, but also preventing generation of abnormal noise. When the oil pressure instruction of the lock-up clutch is sent, whether the speed change instruction for a speed change mechanism is sent is judged; if the speed change instruction is sent, summing of adjusting oil pressures (PA) for the control oil pressure (P) for the lock-up mechanism is carried out. Moreover, a timer (TM) is set used from summing the adjusting oil pressures (PA) to the end. The timer (TM) is set as that the adjusting oil pressures (PA) are summed after the speed change signals are connected and the ending is before the speed change mechanism begins to change speed.

Noise occurring when an upper rail is slid on a lower rail with retainers in contact with either or both of the rails is suppressed. A vehicle seat slide device (10) has the lower rail (11), the upper rail (12), the retainers (13) disposed between both rails (11, 12), and rolling elements (steel balls) rollably supported by the retainers (13) and rolling while being in contact with both rails (11, 12). Each retainer (13) has a retainer body (13d) and projections (13a, 13b, 13c) projecting from the retainer body (13d). The projections (13a, 13b, 13c) are formed of a resin material integrally with the retainer body (13d). Because of the projections (13a, 13b, 13c) formed on the retainer (13), when the retainers (13) make contact with both rails (11, 12), the projections (13a, 13b, 13c) invariably make contact with both rails (11, 12).

A bearing device for a wheel, in which circumferential play is suppressed, which facilitates connection between a hub ring and an outer coupling member, in which a reduction in NVH characteristics due to play at a joint between the hub ring and the constant velocity universal joint and by play between a bearing outer member and a knuckle is prevented, and which performs highly accurate transmission of rotational torque. The bearing device has a groove-ridge fitting structure (M) by which the hub ring (1) and a shaft section (12) of the outer coupling member of the constant velocity universal joint (3) are integrated together, and the shaft section (12) is fitted in a hole (22) of the hub ring (1). In the groove-ridge fitting structure (M), ridges (35) on the outer diameter surface of the shaft section (12) and grooves (36) in the inner diameter surface (37) of the hub ring (1) are fitted to each other in a fitting contact portion (38), and the ridges (35) and the grooves (36) are in intimate contact with each other in the entire fitting contact portion (38).

Provided is a bearing device for a wheel that can realize prevention of a backlash in a circumferential direction and is excellent in workability of connection of a hub wheel and an outer joint member of a constant velocity universal joint. Further, provided is a bearing device for a wheel that can prevent deterioration in NVH characteristics, which is caused by the backlash occurring in a joint section between the hub wheel and the constant velocity universal joint or between an outer member and a knuckle, and can perform rotation torque transmission with high accuracy. The bearing device includes a recess-projection fitting structure (M) in which the hub wheel (1) and a shaft section (12), which is fitted in a hole (22) of the hub wheel (1) of the outer joint member of the constant velocity universal joint (3) are unitized together. In the recess-projection fitting structure (M), entire fitting regions among projections (35) on the outer surface of the shaft section (12) of the outer joint member and recesses (36), which fit on the projections, are brought into intimate contact with each other.

The present invention enables an exhaust gas to quickly pass through a spatial resonance region in an exhaust gas passage space ranging from a turbine housing to a catalyst, by increasing the flow velocity (VN passing flow velocity) of the exhaust gas passing through a nozzle vane when the exhaust gas reaches the spatial resonance region at the time of acceleration in an internal combustion engine provided with a variable nozzle vane turbocharger. When the exhaust gas reaches the spatial resonance region at the time of deceleration, the VN passing flow velocity is decreased to enable the exhaust gas to quickly pass through the spatial resonance region. By this control, it is possible to reduce the time during which the frequency of pressure pulsation generated at the rear end of the nozzle vane is amplified in the spatial resonance region. It is also possible to suppress the generation of abnormal noise caused by the pressure pulsation.

In the present invention, fixed to a base end part of an adjustment lever (34a) is a sub-arm (49) that rotates with the adjustment lever (34a). A reception-side member (52) is fixed to the outer surface of one support plate part (23a) of a support bracket (22a), and a buffer member (54) made of an elastic material is fixed to the reception-side member (52). In a case where the adjustment lever (34a) is rotated in a specific direction, prior to the step parts of both driving side and driven side cam surfaces (32, 33) making contact with each other, the tip end part of the sub-arm (49) makes contact with the buffer member (54). Due to this configuration, in a case where the adjustment lever (34a) is caused to rotate in a specific direction (the direction in which the axial direction dimensions of a cam device (31a) are reduced) so as to adjust the position of a steering wheel, the generation of unpleasant noise that accompanies the coming into contact of the step parts present on both the driving side and driven side cam surfaces (32, 33) can be prevented.

The invention provides a check valve which comprises a valve seat component, a valve main body of a limiting part, a circular plate part, a plurality of guide parts protruding from the periphery of the circular plate part and a valve body capable of moving between the valve seat component and the limiting part and losing the valve due to dead weight, wherein fluid passages are formed in the periphery of the circular plate part by gaps between the adjacent guide parts; on the moving range part of the valve main body corresponding to the valve body, convex parts protruding from the inner side of the valve main body are arranged; the condition that the valve body rotates due to the rotation component of the fluid cannot happen in the check valve.

The present invention provides a centrifugal clutch capable of preveting vibration of a cluth housing and effectively preventing ccurrence of abnormal sound. This centrifugal clutch is composed of the clutch housing 12 composed of a circular cylindrical part 12a whose inner face becomes a slide-contact face and a bottom plate part 12b covering one end part of the circular cylindrical part, a rotary shaft which has the same axis as the circular cylindrical part of the clutch housing and to which rotation force is transmitted by the clutch housing, a centrifugal shoe for connecting with the clutch housing 12 or disconnecting from it by rotating around the rotary shaft and coming into contact with or leaving the slide-contact face, and a vibration control cover 17 put on an outer side of the circular cylindrical part. The clutch housing 12 and the vibration control cover 17 have contact parts 30, 40 coming into contact mutually, a non-contact part 50 not in contact, and positioning marks 14, 22 for positioning the clutch housing 12 and the vibration control cover 17 at predetermined relative positions for preventing occurrence of abnormal sound.

Noise produced during phase-difference changes is minimized without decreasing the responsiveness of a vibration-wave motor. A lens-side MCU (15) for a lens barrel (10) controls a drive apparatus (14) that applies a drive voltage to the vibration-wave motor (12) by outputting an A-phase drive signal and a B-phase drive signal thereto. The lens-side MCU (15) uses, for example, a drive-voltage setting unit (152) and a duty-cycle change unit (153) to change the drive voltage. Also, the lens-side MCU (15) is provided with a phase-difference change unit (154) that changes the phase difference between the A-phase drive signal and the B-phase drive signal. When driving the vibration-wave motor (12), the lens-side MCU (15) changes the drive voltage to V reg , and when the phase-difference change unit (154) is changing the aforementioned phase difference, the drive voltage is changed to V 1 , V 1 being greater than zero and less than V reg .

A deflector apparatus for a vehicle (12) includes a fixed frame (21), a movable frame (22) positioned at an upper side of the fixed frame and being rotatable between a raised position and a retracted position, a mesh member (23) connected to the fixed frame and the movable frame and brought to a raised state and a retracted state, and a spring member. The spring member includes a sliding portion (44) fitted to a guide groove (51) formed at the movable frame and slidably making contact with the guide groove to transmit a biasing force of the spring member in a state where the movable frame is rotating. The spring member further includes an engagement portion (46) engaging with the movable frame when the movable frame is in the raised position. The movable frame is configured to be maintained at the raised position by the engagement with the engagement portion of the spring member.

A power transmission belt is formed so that the back face side of a belt body is covered with a reinforced fabric woven with warps and wefts. In the reinforced fabric, the direction of warps and the direction of wefts make equal angles with the belt widthwise direction, and each of two directions of consecutive yarn intersections of the warps and wefts formed to stand out from the belt surface makes a certain angle with the belt widthwise direction.

Provided is an insulator which is capable of reducing unusual noises. A first mounting hole (3) for engagement with a vehicle body side is formed in a first section (2), and a second mounting hole (5) for engagement with an exhaust gas pipe side is formed in a second section (4) disposed to be spaced apart from the first section (2). The first section (2) and the second section (4) are coupled to each other by a pair of coupling sections (6). The first section (2) and the second section (4) are adapted such that at least the inner circumferential surfaces of the first mounting hole (3) and the second mounting hole (5) are configured from a rubber-like elastic body having a self-lubricating property. As a result, the self-lubricating property of the inner circumferential surfaces of the first mounting hole (3) and the second mounting hole (5) reduces unusual noises that would be otherwise produced when the first mounting hole (3) or the second mounting hole (5) and a pin are rubbing against each other.