Driving device for wheels

A driving device for a wheelbarrow includes a motor assembly which has a shaft and a driving gear is connected to the shaft. The driving gear is engaged with planet gears of a gear set to drive a collar which is connected to a rim with a tire connected to the rim. Therefore, the wheel rotates when the motor assembly is activated. A brake mechanism an adjustment nut which is threadedly connected to a motor frame of the motor assembly such that when the user pulls a brake lever, the adjustment nut is moved to shift a brake lining to brake the wheel.

FIELD OF THE INVENTION

The present invention relates to a driving device for a wheelbarrow and the driving device is connected with the wheel and includes a brake mechanism.

BACKGROUND OF THE INVENTION

A conventional wheelbarrow for yard work or even for transporting bricks, sands or stones generally includes a bed with two handles on a rear end thereof and a support is connected to an underside of the rear end of the bed. A brace is connected to the underside of the bed and a wheel is connected to the brace. The user holds the handles and pushes the wheelbarrow so that the load in the bed can be moved form one place to another by the wheel. The support can be put on the ground to support the wheelbarrow to stop the wheelbarrow. However, the conventional wheelbarrow requires the user to move it by the user's own force and when the wheelbarrow is moved along an upward path, the user has to push hard to move the wheelbarrow. On the contrary, when the wheelbarrow is moved along a downward path, the user has to control the wheelbarrow not to move too fast or the wheelbarrow cannot be stopped.

The present invention intends to provide a driving device for driving the wheel of the wheelbarrow so that the user needs not push the wheelbarrow hard and can save a lot of energy to focus on other safety issues.

SUMMARY OF THE INVENTION

The present invention relates to a driving device for a wheelbarrow wherein the driving device includes a motor assembly having a shaft and a rotor is mounted onto the shaft. The rotor has a coil connected thereto. The motor assembly further includes a frame embracing the rotor and magnets, electric brushes, commutators, a motor frame with a threaded section, and a cover. A gear set has a collar which has a toothed inner periphery and a board is located within the collar and a plurality of planet gears are rotatably connected to the board and engaged with the toothed inner periphery. A driving gear is connected to the shaft and engaged with the planet gears. A wheel assembly has a tire connected to a rim and the collar is connected to the rim. A brake mechanism has a connection plate which is connected to a side of the motor frame. An adjustment nut has a threaded inner periphery which is threadedly connected to the threaded section on the motor frame. A brake lining is located between the adjustment nut and the connection plate. A fastener is mounted to an outer periphery of the adjustment nut. A link is connected to the motor frame and connected with an end of a spring. The other end of the spring is connected with the fastener which is connected to a brake lever.

The primary object of the present invention is to provide a driving device for driving a wheel of a wheelbarrow.

Another object of the present invention is to provide a driving device for driving a wheel of a wheelbarrow wherein the wheel can be stopped by operating a brake mechanism.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring toFIGS. 1 to 3, the driving device of the present invention for driving a wheel of a wheelbarrow comprises a motor assembly10which includes a shaft11with a rotor12mounted onto the shaft11, the rotor12having a coil13connected thereto, a frame14embracing the rotor12, magnets15, electric brushes16, commutators17, a motor frame18having a threaded section181, and a cover19.

A gear set20has a collar24which has a toothed inner periphery241and a board21is located within the collar24. A first bearing25is connected between the collar24and the board21. A plurality of planet gears22are rotatably connected to the board21by pins211and engaged with the toothed inner periphery241. A driving gear23is connected to the shaft11and located at a center of the planet gears22and engaged with the planet gears22. A wheel assembly30has a tire31connected to a rim32and the collar24is connected to the rim32.

A brake mechanism40has a connection plate24awhich is connected to a side of the motor frame18and a second bearing41is connected between the connection plate24aand the motor frame18. An adjustment nut42has a threaded inner periphery421which is threadedly connected to the threaded section181on the motor frame18. A brake lining43is located between the adjustment nut42and the connection plate24a. A fastener44is mounted to an outer periphery of the adjustment nut42. A link45is connected to the motor frame18and connected with an end of a spring47. The other end of the spring47is connected with the fastener44which is connected to a brake lever46. The threaded section181on the motor frame18and threaded inner periphery421of the adjustment nut42have wide pitches so that they can move relative to each other with a small angular movement.

There is a receptacle50to be connected with a power cable (not shown) so as to drive the wheel assembly30clockwise or counter clockwise. When the shaft11of the motor assembly10is activated, the planet gears22is driven by the driving gear23and the collar24is rotated and generates a large torque which drives the wheel assembly30to move.

When the user wants to stop the wheelbarrow, the power is shot off and the user pulls the brake lever46, the fastener44and the adjustment nut42are moved by the threaded inner periphery421of the adjustment nut42so that the brake lining43is moved to contact the connection plate24ato stop the wheel assembly30. when releasing the spring47, the adjustment nut42moves back and the brake lining43is also removed from the connection plate24a. The wide pitches of the threaded section181on the motor frame18and threaded inner periphery421of the adjustment nut42allow the user to pull the brake lever a small angle to brake the wheel assembly30.

The wheelbarrow can be easily operated by using the motor assembly10and the gear set20provides a large torque to easily drive the wheel assembly30to move the wheelbarrow on a rugged road. The brake mechanism40allows the user to stop the wheelbarrow at desired position.