BACKGROUND OF THE INVENTION

Field of Invention

The invention relates to a rivet nut machine, and more particularly to a motor with bidirectional output capable of respectively driving different structures of the electric rivet nut machine.

Related Art

FIG. 1shows a conventional electric rivet nut machine10, which has a rivet nut drive unit11and a motor12; the rivet nut drive unit11processes two actions, one of the actions is to rotate a head, so that the head can be screwed with a rivet nut (not shown in the figure), and the other action is to move the rivet nut drive unit11, after the head is fixedly screwed with the rivet nut, the rivet nut is pulled toward the electric rivet nut machine10to deform the rivet nut, thereby riveting action can be completed. In order to achieve the two actions, the rivet nut drive unit11is provided with a moving gear111and a coupling gear112; the coupling gear112can drive the rivet nut drive unit11to rotate, so that the rivet nut drive unit11can screw the rivet nut inward or outward; and the moving gear111can drive the rivet nut drive unit11to move toward the electric rivet nut machine10after the rivet nut drive unit11is screwed into the rivet nut, so that the rivet nut forms an action of riveting and fixing. In order for the motor12to simultaneously drive the moving gear111and the coupling gear112on the rivet nut drive unit11to rotate, the motor12is additionally engaged with a gear shaft13; the gear shaft13provided with a first gear131and a second gear132is transversely disposed between the motor12and the rivet nut drive unit11. The first gear131will engage with the moving gear111; the second gear132will engage with the coupling gear112, since the moving gear111and the coupling gear112are located at two ends of the motor12respectively, a length of the gear shaft13needs to be greater than a length of the motor12to be able to respectively engage with the moving gear111and the coupling gear112; when the motor12rotates, it will drive the gear shaft13to rotate, in addition, the first gear131and the second gear132of the gear shaft13respectively drive the moving gear111and the coupling gear112on the rivet nut drive unit11, and the coupling gear112and the moving gear111on the rivet nut drive unit11are driven to respectively perform actions of screwing with the rivet nut and pulling the rivet nut to compress in order to complete the action of fixedly riveting of the rivet nut; in another conventional electric rivet nut gun, in order to generate different rotation speeds to control the moving gear111and the coupling gear112, two different motors are used for engaging, and rotation speeds of the moving gear111and the coupling gear112can be adjusted through rotation speeds of the two different motors.

Please refer toFIG. 2, in order to correspond to different materials and specifications of the rivet nut, a control panel14is provided on an outer side of the electric rivet nut machine10. Users can input different values of 01-99 on the control panel14according to the type of use. Different materials and specifications are given corresponding values to change a torsion of the motor12.

However, in the aforementioned prior art, the gear shaft13needs to be disposed horizontally between the motor12and the rivet nut drive unit11, which will increase the distance between the motor12and the rivet nut drive unit11. In addition, the gear shaft13is directly engaged with the motor12and the rivet nut drive unit11, and the space between the gear shaft13and the rivet nut drive unit11is limited, resulting in no other gear sets can be disposed between the motor12and the rivet nut drive unit11for proportioning rotation speeds, and therefore the gear ratio used by the moving gear111and the coupling gear112of the rivet nut drive unit11will be restricted. Although different speed ratios can be proportioned by using two different motor outputs, using two motors not only increases the costs and weight, two motors also consume relatively more electricity during operation, resulting in shortened operating time. In addition, although the control panel14can adjust the values to change the torsion output of the motor12, the values need to be checked with a table of values and input correspondingly. If the user forgets the values corresponding to the material and specification of the rivet nut, the user needs to check with the table repeatedly, which causes inconvenience in use.

SUMMARY OF THE INVENTION

An object of the invention is to provide an electric rivet nut machine having a motor with bidirectional output capable of respectively driving a rivet nut drive unit.

Another object of the invention is to provide an electric rivet nut machine with a single motor having two output shafts with different output rotation speeds.

Yet another object of the invention is to provide an electric rivet nut machine that is easy to input parameters.

In order to achieve the above objects, the invention provides an electric rivet nut machine comprising:

a housing with an accommodating space inside;

a motor disposed in the accommodating space and having a first output shaft and a second output shaft; the first output shaft is connected with a first gear set, and the second output shaft is connected with a second gear set; and

a rivet nut drive unit disposed in the accommodating space and having a rivet nut shaft, a coupling gear and a moving gear; the moving gear is engaged with the first gear set; and the coupling gear is engaged with the second gear set.

Preferably, the motor further has a body, the first output shaft and the second output shaft are disposed on two sides of the body respectively, and the first gear set and the second gear set are also respectively disposed on the two sides of the body.

Preferably, the first gear set comprises a first shaft gear and a first speed transforming gear shaft; the first shaft gear is disposed on the first output shaft, the first speed transforming gear shaft is pivotally disposed on the housing and has a first main gear and a first auxiliary gear, the first main gear is engaged with the first shaft gear; and the first auxiliary gear is engaged with the moving gear.

Preferably, the second gear set comprises a second shaft gear and a second speed transforming gear shaft; the second shaft gear is disposed on the second output shaft, the second speed transforming gear shaft is pivotally disposed on the housing and has a second main gear and a second auxiliary gear, the second main gear is engaged with the second shaft gear; and the second auxiliary gear is engaged with the coupling gear.

In the electric rivet nut machine provided by the invention, the motor can be respectively engaged with the coupling gear and the moving gear of the rivet nut drive unit from two end sides, so that the first gear set and the second gear set between the motor and the rivet nut drive unit can be adaptively matched with gear sets with different gear ratios, and the rivet nut drive unit is capable of producing a better gear ratio design according to the requirements of different gears.

