CN102039573A - Handheld fixed-torque electric wrench - Google Patents

The invention relates to a wrench, in particular to a handheld fixed-torque electric wrench which comprises a handle, wherein the front end of the handle is fixedly connected with a shell; the internal rear part of the shell is provided with a motor; the output shaft of the motor is fixedly connected with a first-stage central wheel of a planetary reducer; a final-stage central wheel of the planetary reducer is connected with the rear end of a torque output shaft through a final-stage planetary wheel; the front end of the torque output shaft penetrates through a bearing seat in a lining at the front end of the shell to extend out of the shell; the front end of the torque output shaft is provided with a square shaft; a torque sensor is arranged outside the torque output shaft in the shell; the front end of the torque sensor is connected with the lining; the rear end of the torque sensor is connected with a final-stage inner gear ring of the planetary reducer through an inner gear; the handle is provided with a start button and a positive and negative rotation switch; and the start button, the positive and negative rotation switch, the motor and the torque sensor are respectively connected with a controller through cables. The wrench of the invention has simple structure, is convenient to use, and lightens the working labor intensity and improves the working efficiency on the premise of ensuring tightening accuracy.

Technical field:

The present invention relates to a kind of spanner, especially a kind of hand-held electric constant torque wrench.

Background technology:

Current more and more higher in mechanical industry double thread assembling quality requirement, especially it is very many to be connected with the position of deciding torque demand at railway and automobile industry double thread, and at present for the bigger position of torque demand owing to tighten more great single shaft or the multiaxis combined type of all adopting of axle by hanging, auxiliary bodies such as dolly finish assembling work, mainly adopt pneumtic impact wrench or the manual quiet spanner of turning round to carry out tightening operation to little moment of torsion position, though the pneumtic impact wrench operating type is flexible, efficient is also higher, but exist noise big, shortcomings such as the moment of torsion control accuracy is low, and manual quietly turn round the spanner operating type though to tighten precision higher relatively, exist efficient low, shortcomings such as labor strength is big.

Summary of the invention:

The invention provides a kind of hand-held electric constant torque wrench, it is simple in structure, and is easy to use, tightens under the prerequisite of precision in assurance, has alleviated the labour intensity of work, has improved operating efficiency, has solved problems of the prior art.

The present invention solves the problems of the technologies described above the technical scheme that is adopted to be: it comprises handle, at the front end of the handle housing that is connected, the rear portion is provided with a motor in the housing, the output shaft of motor and the primary centre of planetary reduction gear wheel are connected, the final stage centre wheel of planetary reduction gear links to each other with the torque output shaft rear end through the final stage planetary gear, the bearing block that the torque output shaft front end passes in the housing front end lining stretches out outside the housing, and the torque output shaft front end is a square shaft; The torque output shaft outside in housing is provided with a torque sensor, and the torque sensor front end links to each other with lining, and the rear end is connected with the planetary reducer final stage ring gear by internal tooth; Be provided with a start button and a forward-reverse switch on handle, start button, forward-reverse switch, motor and torque sensor link to each other with controller through cable respectively.

Be provided with a bent angle working head in torque output shaft the place ahead, the bent angle housing that described bent angle working head comprises, the bent angle housing is connected by bearing pin and gland and lining, horizontal ends and vertical end inside at the bent angle housing are provided with a drive bevel gear and a driven wheel of differential by a bearing block respectively, drive bevel gear and driven wheel of differential are connected with a joggle, the drive bevel gear outer end is sleeved on the torque output shaft front end, and the outer square shaft rear end of pulling of driven wheel of differential lower end and bent angle housing is connected.

In the bent angle housing driven wheel of differential above be provided with a bumping post, be provided with a spring between bumping post and the driven wheel of differential.

Described forward-reverse switch comprises that one is located at the toggle switch of handle inside, and the position of corresponding toggle switch is provided with a switch ring on handle, and the pendulum handle of toggle switch snaps in the switch ring inboard groove.

The present invention is simple in structure, volume is little, the operator uses comfortable convenience, adopting motor to drive torque output shaft through planetary reduction gear rotates, and, adjust the motor output torque by controller again by torque sensor feedback torque signal, reach the purpose of accurate control torque output, thereby alleviated working strength of workers, improved operating efficiency; In torque output shaft the place ahead one bent angle working head is set, can carries out the dismounting operation to the bolt under the particular surroundings easily, can make the spanner scope of application of the present invention wider, be applicable to different workplaces.

Description of drawings:

Fig. 1 is a structural representation of the present invention.

Another implements the structural representation of formula to Fig. 2 for the present invention.

Among the figure, 1, handle; 2, housing; 3, motor; 4, planetary reduction gear; 5, primary centre wheel; 6, final stage centre wheel; 7, final stage planetary gear; 8, torque output shaft; 9, lining; 10, torque sensor; 11, final stage ring gear; 12, start button; 13, cable; 14, controller; 15, toggle switch; 16, switch ring; 17, bent angle housing; 18, gland; 19, drive bevel gear; 20, driven wheel of differential; 21, square plate axle; 22, bumping post; 23, spring.

The specific embodiment:

For clearly demonstrating the technical characterstic of this programme, below by the specific embodiment, and in conjunction with its accompanying drawing, the present invention will be described in detail.

The present invention does not describe part in detail, is those skilled in the art of the present technique's known technology.