32results about How to "Reduce gear noise" patented technology

A power transmission device is provided with: a first gear having a plurality of teeth that share an identical tooth profile; an intermediate gear that is engaged with the first gear; and a second gear that is engaged with the intermediate gear, and has a plurality of teeth that share an identical tooth profile, wherein the first gear and the second gear have an identical number of teeth, an identical reference diameter, and an identical reference pitch; and the tooth profile of the first gear is different from that of the second gear.

A multi-speed automatic transmission includes an input and output, first, second and three planetary gear units, each gear unit including a sun gear, a ring gear, planet pinions meshing with the sun gear and the ring gear, and a carrier rotatably supporting the planet pinions. A first brake alternately holds against rotation and releases the sun gear of the second gear unit and the sun gear of the third gear unit. A second brake alternately holds and releases the carrier of the second gear unit. A first clutch alternately connects and disconnects the carrier of the first gear unit and the ring gear of the third gear unit. A second clutch alternately disconnects and connects the carrier of the first gear unit to the sun gears of the second gear unit and third gear unit. A third clutch alternately releases and connects the input and ring gear of the first gear unit to the carrier of the second gear unit.

The electric cart has a main body, wheels at the bottom of the main body and a gear motor to electrically drive the wheels. The gear motor includes a motor having a motor shaft, an output shaft connected to at least one of the wheels, and a gear reduction unit connecting the motor shaft to the output shaft. The gear reduction unit has a helical gear train.

An electromagnetic switch unit comprises a solenoid device that pushes out a pinion gear to a ring gear side of an engine, and an electromagnetic switch that opens and closes a main point of contact of a motor circuit. The solenoid device and the electromagnetic switch are arranged in series in an axial direction, while a magnetic plate that forms a part of magnetic circuit between a first coil used for the solenoid device and a second coil used for the electromagnetic switch is shared by the solenoid device and the electromagnetic switch.

In a disk carrying device including a first idle gear rotatably supported by a lower chassis and a second idle gear for contacting and separating from the first idle gear to perform a rotation operation, the second idle gear and a roller gear meshing therewith are rotatably supported by a feed plate to cause the second idle gear to contact and separate, from below, from the first idle gear rotatably supported by the lower chassis. Because of this configuration, in disk insertion, a downward force F1 acts on the second idle gear and a pushing pressure of the feed roller to a disk D decreases. In disk ejection, an upward force F2 acts on the second idle gear and the pushing pressure of the feed roller to the disk D increases.

A method for improving fuel-efficiency during a temporary stop may include dividing, by an engine control apparatus, a neutral control condition into a neutral control entry and a neutral control release during a D-stage temporary stop, determining, a neutral control entry D-stage target RPM at a time of the neutral control entry, and a neutral control release D-stage target RPM at a time of the neutral control release, and RPM shifting the neutral control entry D-stage target RPM to a speed gradient conforming to a transmission clutch release time of a transmission control apparatus at a time of a neutral control after the neutral control entry and RPM shifting the neutral control release D-stage target RPM to a speed gradient conforming to a clutch coupling time of a transmission by the transmission control apparatus at a time of a neutral control after the neutral control release.

A method for adjusting the meshing position of a hypoid gear having a first gear, and a second gear meshing with the first gear and transmitting the rotary motion thereof in the direction different from the extending direction of the axis of rotation of the first gear. The method for adjusting the meshing position comprises; a) a step for displacing the second gear a plurality of times along the axial direction of rotation while meshing with the first gear, b) a step for measuring the transmission error at each displacement position and plotting the relation of the displacement distance of the second gear and the measured transmission error, c) a step for evaluating the virtual transmission error between the measured transmission errors from the measured transmission error, d) a step for subtracting the measured transmission error and the virtual transmission error from a maximum allowable transmission error to determine the difference, e) a step for determining the area of a part surrounded by the difference and the maximum allowable transmission error by integrating the difference with the displacement distance of the second gear, and f) a step for dividing the part at a predetermined area ratio and setting a point where the division line intersects the displacement distance of the second gear at the meshing position of the second gear.

This invention provides a case-hardening steel excellent in cold forgeability and low carburization distortion property that exhibits low deformation resistance and high limit compressibility when cold, namely, a case-hardening steel excellent in cold forgeability and low carburization distortion property comprising, in mass %, C: 0.07% to 0.3%, Si: 0.01% to 0.15%, Mn: 0.1% to 0.7%, P: 0.03% or less, S: 0.002% to 0.10%, Al: 0.01% to 0.08%, Cr: 0.7% to 1.5%, Ti: 0.01% to 0.15%, B: 0.0005% to 0.005%, N: 0.008% or less, and the balance of Fe and unavoidable impurities, and having a metallographic structure comprising 65% or greater of ferrite and 15% or less of bainite.

It is provided a meshed gear for a vehicle disposed in a power transmission path between an engine and drive wheels and made up of a pair of gears meshed with each other, at least one gear making up the meshed gear having a ring shape, and the one gear having an outer circumferential portion disposed with an additional vibration system.

A vehicle drive apparatus includes a motor generator, a speed reduction mechanism connected to a rotor shaft of the motor generator, an output shaft connected to the speed reduction mechanism, an intermediate wall separating the motor generator from the speed reduction mechanism, and a bearing that is fixed to the intermediate wall and supports the rotor shaft. The motor generator, intermediate wall, speed reduction mechanism, and output shaft are disposed in this order, and a ring gear of the speed reduction mechanism is fixed. The ring gear is fixed to the intermediate wall via a ring gear flange that is positioned relative and fixed to the intermediate wall by a centering mechanism and a locking mechanism. The centering mechanism is formed by fitting a boss of the ring gear flange and the intermediate wall. The locking mechanism is disposed on an outer peripheral side relative to the centering mechanism.

A medical or dental handpiece has a grip 3. The grip 3 includes first to third rotation shafts 101, 201, and 301. The first and second shafts are connected through a first gear mechanism 1000 and the second and third shafts are connected through a second gear mechanism 2000 so that a rotation is transmitted from the first shaft through the first gear mechanism to the second shaft and then from the second shaft through the second gear mechanism to the third shaft. The first or second gear mechanism has an internal gear secured on shaft and an external gear secured on the other shaft, the internal and the external gears being engaged with each other. The external gear is substantially enclosed within a cylindrical plane 1001, 2001 extending along a peripheral edge of the internal gear.

A control device for a power transmission device including an automatic transmission and a sub transmission is provided. The control device includes an electronic control unit. The electronic control unit is configured to perform a rotation speed decrease control in which at least one frictional engagement device is controlled to be an engaged state or a semi-engaged state at a time when switching of gear stage of the sub transmission is started or a time when the switching is started. The electronic control unit is configured to end the rotation speed decrease control during switching of the gear stage. The electronic control unit is configured to switch the sub transmission from the power transmission cutoff state to a state in which one of the high-speed engagement element and the low-speed engagement element is engaged, during disengagement of the at least one frictional engagement device.