CN204525301U - A kind of electronic stubborn tool - Google Patents

Abstract

The utility model discloses an electric screwdriver, comprising: a sleeve mouth, a sleeve shaft, an outer ring gear of a harmonic gear, a transmission shaft, a driving motor and a casing; the driving motor is arranged in the casing, and the casing is provided with a There is a control switch for controlling the driving motor; the outer ring gear of the harmonic gear is connected to the driving motor through the transmission shaft; the sleeve shaft is connected to the outer ring gear of the harmonic gear through a bearing; A spring is sleeved on the quill shaft, a sleeve mouth is sleeved on the quill shaft, and the spring connects the quill shaft and the sleeve mouth. Through the above method, the utility model can quickly unscrew the rusted nut without manually aligning the nut, has high efficiency, small size, and large torque, and is suitable for vehicle-mounted backup.

Description

an electric screwdriver

technical field

The utility model relates to the field of mechanical engineering, in particular to an electric screwdriver.

Background technique

There will always be some big or small problems in the long-term use of mechanical products. However, some nuts will be rusted due to long-term use and difficult to unscrew during the maintenance process. In the past, the method of lengthening the action arm had the disadvantages of difficulty in applying force, insufficient force, and high risk. If the method of screwing the nut with a jackhammer was used, there were problems of large mass and inconvenient movement. And because it is difficult to keep the hexagonal direction of each nut consistent, usually the nuts must be manually aligned before the screwdriver is used, which wastes a lot of time.

Utility model content

The technical problem mainly solved by the utility model is to provide an electric screwdriver, which can quickly unscrew rusted nuts without manually aligning the nuts, has high efficiency, small size, and large torque, and is suitable for vehicle backup.

In order to solve the above-mentioned technical problems, a technical solution adopted by the utility model is to provide an electric screwdriver, including: sleeve mouth, sleeve shaft, harmonic gear outer ring gear, transmission shaft, drive motor and casing; The driving motor is arranged in the casing, and a control switch for controlling the driving motor is arranged on the casing; the outer ring gear of the harmonic gear is connected to the driving motor through the transmission shaft; the sleeve shaft is connected to the driving motor through the bearing. The harmonic gear is connected to the outer ring gear; the sleeve shaft is covered with a spring, the sleeve mouth is sleeved on the sleeve shaft, and the spring connects the sleeve shaft and the sleeve mouth.

Preferably, a card slot is provided on the inner side of the sleeve opening, and a block corresponding to the card slot is provided on the sleeve shaft, and the block is stuck in the card slot to limit the rotation of the sleeve shaft to drive the sleeve. The cylinder mouth rotates synchronously.

Preferably, the sleeve shaft and the bearing form a wave generator, and the tooth marks of the outer ring of the bearing mesh with the internal tooth marks of the outer ring gear of the harmonic gear to form a harmonic gear transmission mechanism.

Preferably, the control switch of the driving motor is divided into two stages, and the two-stage control switches respectively control the low-speed rotation and high-speed rotation of the driving motor.

Preferably, the housing is provided with a main handle and an auxiliary handle.

The beneficial effects of the utility model are: the utility model can quickly unscrew the rusted nut without manually aligning the nut, has high efficiency, small size, and large torque, and is suitable for vehicle-mounted backup.

Description of drawings

Figure 1 is a schematic perspective view of a preferred embodiment of an electric screwdriver of the present invention;

Fig. 2 is an A-A cross-sectional schematic diagram of an electric screwdriver of the present invention;

Fig. 3 is a B-B cross-sectional schematic diagram of an electric screwdriver of the present utility model;

The marks of each part in the accompanying drawings are as follows: 1. Sleeve mouth; 2. Spring; 3. Sleeve shaft; 4. Bearing; 5. Harmonic gear outer ring gear; 6. Transmission shaft; 7. Drive motor; 8. Shell; 9. Control switch; 10. Main handle; 11. Auxiliary handle.

Detailed ways

The preferred embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings, so that the advantages and characteristics of the utility model can be more easily understood by those skilled in the art, so that the protection scope of the utility model can be defined more clearly .

Please refer to Fig. 1 to Fig. 3, the utility model embodiment comprises:

An electric screwdriver, comprising: a sleeve port 1, a sleeve shaft 3, a harmonic gear outer ring gear 5, a transmission shaft 6, a drive motor 7 and a housing 8; the drive motor 7 is arranged in the housing 8, The casing 8 is provided with a control switch 9 for controlling the drive motor 7, and the control switch 9 can facilitate the manipulation of the drive motor 7; the harmonic gear outer ring gear 5 is connected with the drive motor 7 through the transmission shaft 6 The quill 3 is connected with the harmonic gear outer ring gear 5 through the bearing 4; the quill 3 is covered with a spring 2, the sleeve mouth 1 is set on the quill 3, and the spring 2 The sleeve port 1 and the quill shaft 3 are connected, and the spring 2 can make the sleeve port 1 align with the nut and quickly catch the nut. The inner side of the sleeve mouth 1 is provided with a card slot, and the sleeve shaft 3 is provided with a block corresponding to the card slot, and the block is stuck in the card slot to limit the rotation of the sleeve shaft 3 to drive the sleeve Port 1 rotates synchronously. The sleeve shaft 3 and the bearing 4 form a wave generator, and the tooth marks of the outer ring of the bearing 4 mesh with the internal tooth marks of the outer ring gear 5 of the harmonic gear to form a harmonic gear transmission mechanism. The transmission mechanism can convert a small torque into a large torque, so that the motor only needs to input a small torque to realize the unscrewing of the nut. The control switch of the drive motor 7 is divided into two stages. The two-stage control switch controls the low-speed rotation and high-speed rotation of the drive motor 7 respectively. The low-speed rotation can control the fast alignment of the nut, and the high-speed rotation can realize the fast unscrewing of the nut. The shell 8 is provided with a main handle 10 and an auxiliary handle 11. The main handle 10 is convenient for holding an electric screwdriver. The sleeve mouth 1 is quickly aligned with the nut and then unscrewed. The auxiliary handle 11 can better Unscrew after aligning the nut.

When in use, press the primary switch of the control switch 9 to drive the motor 7 to rotate at a low speed, so that the sleeve mouth 1 is in a rotating state; hold the main handle 10 and put the sleeve mouth 1 against the nut that needs to be unscrewed, and the sleeve mouth 1 Because it is in a rotating state and under the action of the spring 2, quickly align the nut; then press the secondary switch of the control switch 9 to drive the motor 7 to rotate at a high speed; under the action of the harmonic gear transmission mechanism, when a rotation cycle is completed , the torque applied by the sleeve port 1 on the nut is i (transmission ratio) times the torque applied by the drive motor 7, and the transmission ratio range of the harmonic gear is very large (single-stage 50-300, double-stage 3000-60000) , the setting of the transmission ratio depends on the division of the number of teeth, so the small torque output by the drive motor 7 can unscrew the rusted nut, so high-speed rotation is relative to low-speed rotation.

The utility model can quickly unscrew the rusted nut without manually aligning the nut, has high efficiency, small size and large torque, and is suitable for vehicle-mounted backup.

The above is only an embodiment of the utility model, and does not limit the patent scope of the utility model. Any equivalent structure or equivalent process conversion made by using the utility model specification and accompanying drawings, or directly or indirectly used in other Related technical fields are all included in the patent protection scope of the present utility model in the same way.

Claims (5)

1. An electric screwdriver, characterized in that it comprises: a sleeve mouth, a sleeve shaft, an outer ring gear of a harmonic gear, a transmission shaft, a driving motor and a casing; the driving motor is arranged in the casing, and A control switch for controlling the drive motor is provided; the harmonic gear outer ring gear is connected to the drive motor through the transmission shaft; the sleeve shaft is connected to the harmonic gear outer ring gear through a bearing; the A spring is sleeved on the sleeve shaft, a sleeve mouth is sleeved on the sleeve shaft, and the spring connects the sleeve shaft and the sleeve mouth. 2. An electric screwdriver according to claim 1, characterized in that: a slot is provided on the inner side of the sleeve mouth, and a block corresponding to the slot is provided on the sleeve shaft, and the block is locked The rotation of the sleeve shaft is defined in the card slot to drive the sleeve mouth to rotate synchronously. 3. An electric screwdriver according to claim 2, characterized in that: the sleeve shaft and the bearing form a wave generator, and the tooth marks of the outer ring of the bearing and the inner ring gear of the harmonic gear The tooth marks mesh with each other to form a harmonic gear transmission mechanism. 4. An electric screwdriver according to claim 3, characterized in that: the control switch of the driving motor is divided into two stages, and the two-stage control switches respectively control the low-speed rotation and high-speed rotation of the driving motor. 5. An electric screwdriver according to claim 1, wherein a main handle and an auxiliary handle are provided on the housing.