69results about How to "Easy to change speed" patented technology

A device for stretching webs of material transversely to a travel direction thereof, includes at least one rotary stretcher extending transversely to the travel direction of the web of material. The stretcher is composed of at least two round tubes which are aligned axially with each other and are supported by ball-and-socket joints on links. The links are mounted adjustably on a base frame.

The present invention relates to a roller board, and more particularly, to a pedal-driven roller board that converts a reciprocating motion of pedals formed on the board into a rotational motion to drive a gear, so that a user can drive the board without kicking the ground. Furthermore, the pedal-driven roller board includes a derailleur, so that a user can conveniently control the speed of the pedal-driven roller board. Moreover, a user can develop and strengthen his / her muscles by pedaling the pedal-driven roller board. To this end, a pedal-driven roller board according to the present invention includes: a handle disposed at the front side of a board to steer a front wheel; a rear wheel at the rear side of the board; and two pedals formed on the top surface of the board to drive the rear wheel. Further, the pedal-driven roller board includes: a link having an end hinged to the bottom surface of a pedal; a driving gear formed on an end of a crankshaft connected through a shaft to the other end of the link to convert a reciprocating motion of the pedal into a rotational motion; a clutch gear engaged with the driving gear to rotate, and selectively connected to one of either a first speed gear or a second speed gear to rotate same; a first connecting gear and a second connecting gear, which rotatably engage with the first speed gear and the second speed gear, respectively, and are installed on an end of a connecting shaft; a transmission gear installed on both ends of the connecting shaft and rotated by torque transmitted through the connecting shaft from the first and second connecting gears; and a rotation gear engaging with the transmission gear to rotate, and connected to the rear wheel through a rotation shaft to transmit the torque from the transmission gear to the rear wheel.

A device for stretching webs of material transversely to a travel direction thereof, includes at least one rotary stretcher extending transversely to the travel direction of the web of material. The stretcher is composed of at least two round tubes which are aligned axially with each other and are supported by ball-and-socket joints on links. The links are mounted adjustably on a base frame.

The invention discloses a long-conical and rolling-conical type stepless variable drive mechanism which comprises a first long-conical roller, a second long-conical roller and an intermediate rolling-conical wheel; a first conical surface and a second conical surface are arranged on the intermediate rolling-conical wheel; the first conical surface is in contact drive with the first long-conical roller; the second conical surface is in contact drive with the second long-conical roller; the contact positions of the intermediate rolling-conical wheel on two long-conical rollers can be adjusted, therefore, the working radiuses of the two long-conical rollers can be continuously changed, and as a result, the stepless variable drive can be achieved. According to the long-conical and rolling-conical type stepless variable drive mechanism, the geometrical slippage is zero under the optimal drive, so that the geometrical slippage of the conical wheel type long-conical and rolling-conical type stepless variable drive mechanism can be effectively reduced, and the drive efficiency and power can be increased. The long-conical and rolling-conical type stepless variable drive mechanism is applicable to various fields such as the vehicle field, the ship field and the mechanical drive field.

The invention discloses a transmission structure comprising an input module, a speed change module and an output module; the input module comprises an input shaft, and the output module comprises an output shaft; the speed change module comprises a sliding guide sleeve, a gear shifting mechanism, a gear set and a transmission part, and the gear set comprises an outer gear and an inner gear which are meshed with each other; the sliding guide sleeve is sleeved with the input shaft, and provided with an ring groove and a key, and the gear shifting mechanism is clamped at the ring groove; the inner gear is provided with a first transmission hole, and the output module is provided with a second transmission hole; the transmission part is connected with the first transmission hole and the secondtransmission hole, and the outer gear is provided with a first inner hole comprising a first inner groove; and the output module is provided with a second inner hole comprising a second inner groove,and the key is in key connection with the outer gear through the first inner groove or in key connection with the output shaft through the second inner groove. The transmission structure disclosed bythe invention is compact and simple, low in cost, smooth in gear shifting, and convenient and reliable in speed change, and meanwhile the problems of gear collision, even gear breakage, are avoided.

When a cam shaft phase is changed during engine operation is stopped, a power supply increase control to an electric motor is carried out, according to which a power-supply duty ratio to the electric motor is increased to a predetermined power increase value which is necessary for moving a VVT apparatus during the stop of the engine operation. Then, the power-supply duty ratio is feedback controlled so that an actual changing speed of the cam shaft phase becomes equal to a target changing speed. As a result, the cam shaft phase can be surely changed and operating sound can be reduced by preventing the changing speed of the cam shaft phase from becoming too fast.