CN214602071U

CN214602071U - Output shaft self-locking device of electric drill

Info

Publication number: CN214602071U
Application number: CN202120153153.5U
Authority: CN
Inventors: 王凤军; 黄建平
Original assignee: Jiangsu Dayi M&e Tools Co ltd
Current assignee: Jiangsu Dartek Technology Co Ltd
Priority date: 2021-01-21
Filing date: 2021-01-21
Publication date: 2021-11-05
Anticipated expiration: 2031-01-21

Abstract

The utility model discloses an output shaft self-lock device of electric drill, including rotating output shaft and the drive frame that sets up in the gear box to and the fixed retaining ring that sets up in the gear box, the afterbody of output shaft inserts in the drive frame, and has the rotational degree of freedom that is less than 360 each other, the drive frame is provided with the drive block along the axial, flat position has been seted up on the output shaft, flat position department has placed the self-locking pin, drive block and self-locking pin all are located between output shaft and the retaining ring, flat position is greater than the difference between the inner circle radius of retaining ring and the diameter of self-locking pin to the maximum distance at rotation center, and the minimum distance is less than the difference between the inner circle radius of retaining ring and the diameter of self-locking pin. The self-locking mechanism is simple in structure, convenient to assemble and use, capable of achieving self-locking in both forward rotation and reverse rotation, high in self-locking strength, capable of being used for a long time without failure, low in cost and high in reliability.

Description

Output shaft self-locking device of electric drill

Technical Field

The utility model relates to an electric drill auto-lock technical field, concretely relates to output shaft self-lock device of electric drill.

Background

The rotary power tool can be used as a screwdriver as well as an electric drill. When the rotary power tool is used for various purposes, it is necessary to install a proper chuck for holding a bit or a screwdriver. When the screwdriver is used as a screwdriver, the motor can drive the output shaft to rotate in the forward direction or the reverse direction; however, under special conditions such as the need to adjust the screwing force, the machine cannot replace manual work, for example, workers need to determine the screwing force according to experience and hand feeling. When the general electric tool is not electrified, the output shaft can rotate freely, and manual screwing cannot be realized. And if make the output shaft can not rotate through the motor is electrified, can damage the motor again, reduce electric tool's life.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide an output shaft self-lock device of electric drill, its simple structure, equipment and convenient to use, no matter corotation, reversal homoenergetic can realize the auto-lock, and the intensity of auto-lock is high, can use for a long time and not become invalid, and is with low costs, and the reliability is high.

In order to solve the technical problem, the utility model provides an output shaft self-lock device of electric drill, including rotating output shaft and the drive frame that sets up in the gear box to and the fixed stop collar that sets up in the gear box, the afterbody of output shaft inserts in the drive frame, and has the rotational degree of freedom that is less than 360 each other, the drive frame is provided with the drive block along the axial, flat position has been seted up on the output shaft, flat position has placed from the lockpin, the drive block all is located between output shaft and the stop collar from the lockpin, flat position is greater than the difference of the inner circle radius of stop collar and the diameter of self-locking pin to the maximum distance of rotation center, and the minimum distance is less than the difference of the inner circle radius of stop collar and the diameter of self-locking pin.

Preferably, the output shaft and the driving frame are matched, and the minimum distance between the driving frame and the rotation center is smaller than the maximum distance between the output shaft and the rotation center.

Preferably, the cross section of the output shaft and the cross section of the driving frame at the matching position are both in a triangle with curved sides, and the output shaft is adjacent to the driving frame at the matching position.

Preferably, the number of the driving blocks is three, the driving blocks are uniformly distributed on the periphery of the output shaft, the number of the self-locking pins is three, the self-locking pins are respectively located in gaps between a group of adjacent driving blocks, and the number of the flat positions is three, and the flat positions are respectively located at three corners of a curved triangle.

Preferably, the self-locking pin is cylindrical.

Preferably, the output shaft is sequentially provided with a first bearing, a clamp spring and a second bearing in a penetrating manner, and the output shaft, the first bearing, the clamp spring and the second bearing are pressed in the gear box together.

Preferably, a gasket is arranged between the second bearing and the stop ring.

Preferably, the gear box is fixedly arranged on a shell of the electric tool, and the driving frame is connected with the driving end of the electric tool.

Preferably, the head of the output shaft is provided with a thread to which an external fitting is attached.

Preferably, the circumference of the stop ring is provided with a convex block, a groove is formed in the gear box, and the convex block is clamped in the groove.

Compared with the prior art, the beneficial effects of the utility model are that:

the optimized design of the utility model, when the driving frame rotates actively, the degree of freedom between the driving frame and the output shaft is reduced gradually until the output shaft and the driving frame rotate synchronously, at the moment, the driving block pushes the self-locking pin to rotate around the output shaft, so that gaps are reserved among the flat position, the self-locking pin and the stop ring all the time, and the driving frame can normally drive the output shaft to rotate; when the output shaft rotates actively, the relative positions of the flat position and the self-locking pin are changed, the gaps among the flat position, the self-locking pin and the stop ring are gradually reduced until the flat position, the self-locking pin and the stop ring are tightly matched, the rotation trend of the output shaft can enable the flat position, the self-locking pin and the stop ring to be matched more tightly, the output shaft is prevented from rotating continuously, and self-locking of the output shaft is achieved. The self-locking mechanism is simple in structure, convenient to assemble and use, capable of achieving self-locking in both forward rotation and reverse rotation, high in self-locking strength, capable of being used for a long time without failure, low in cost and high in reliability.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of the explosion structure of the present invention;

FIG. 2 is a schematic cross-sectional view of the self-locking pin according to the present invention;

FIG. 3 is a schematic structural view of an output shaft;

fig. 4 is a schematic structural diagram of the driving frame.

The device comprises a gear box 1, an output shaft 2, a flat position 21, a bearing I3, a clamp spring 4, a bearing II 5, a gasket 6, a stop ring 7, a self-locking pin 8, a driving frame 9 and a driving block 91.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by a person skilled in the art without any inventive work based on the embodiments of the present invention belong to the protection scope of the present invention.

Examples

Referring to fig. 1-4, the utility model discloses an output shaft self-lock device of electric drill, including rotating output shaft 2 and the drive frame 9 that sets up in gear box 1 to and the fixed retaining ring 7 that sets up in gear box 1. The tail of the output shaft 2 is inserted into the drive frame 9 with a rotational degree of freedom of less than 360 ° relative to each other. The drive rack 9 is provided with a drive block 91 in the axial direction. The output shaft 2 is provided with a flat position 21. The flat position 21 is provided with a self-locking pin 8. The driving block 91 and the self-locking pin 8 are both located between the output shaft 2 and the stop ring 7. The maximum distance from the flat position 21 to the rotation center is larger than the difference between the radius of the inner ring of the stop ring 7 and the diameter of the self-locking pin 8, and the minimum distance is smaller than the difference between the radius of the inner ring of the stop ring 7 and the diameter of the self-locking pin 8. According to the optimized design, when the driving frame 9 rotates actively, the degree of freedom between the driving frame 9 and the output shaft 2 is gradually reduced until the output shaft 2 and the driving frame 9 rotate synchronously, at the moment, the driving block 91 pushes the self-locking pin 8 to rotate around the output shaft 2, so that gaps are reserved among the flat position 21, the self-locking pin 8 and the stop ring 7 all the time, and the driving frame 9 can normally drive the output shaft 2 to rotate; when the output shaft 2 rotates actively, the relative positions of the flat position 21 and the self-locking pin 8 are changed, the gaps among the flat position 21, the self-locking pin 8 and the stop ring 7 are gradually reduced until the flat position, the self-locking pin 8 and the stop ring 7 are tightly matched, the rotation trend of the output shaft 2 can enable the flat position, the self-locking pin 8 and the stop ring 7 to be matched more tightly, the output shaft 2 is further prevented from continuing to rotate, and the self-locking of the output shaft 2 is realized. The self-locking mechanism is simple in structure, convenient to assemble and use, capable of achieving self-locking in both forward rotation and reverse rotation, high in self-locking strength, capable of being used for a long time without failure, low in cost and high in reliability.

Specifically, the output shaft 2 is sequentially provided with a first bearing 3, a clamp spring 4 and a second bearing 5. The output shaft 2, the first bearing 3, the clamp spring 4 and the second bearing 5 are pressed in the gear box 1 together. The head of the output shaft 2 is provided with threads for mounting external fittings. The gear case 1 is fixedly provided on a housing of the electric power tool. The drive rack 9 is connected to the drive end of the power tool. And a gasket 6 is arranged between the second bearing 5 and the stop ring 7. The circumference of the stop ring 7 is provided with a projection. A groove is formed in the gear box 1. The projection is clamped in the groove.

In order to have a rotational degree of freedom between the output shaft 2 and the drive carrier 9 of less than 360 °, the output shaft 2 and the drive carrier 9 may be brought into engagement with a minimum distance of the drive carrier 9 from the centre of rotation being smaller than a maximum distance of the output shaft 2 from the centre of rotation. When the drive carrier 9 is in contact with the rotation center at the minimum distance from the rotation center and the output shaft 2 is in contact with the rotation center at the maximum distance from the rotation center in the circumferential direction, the degree of freedom between the drive carrier 9 and the output shaft 2 is lost. In order to improve the sensitivity of the self-locking, the distance between the minimum distance of the drive rack 9 from the centre of rotation and the maximum distance of the output shaft 2 from the centre of rotation can be reduced.

The cross sections of the output shaft 2 and the driving frame 9 at the matching position are both in a triangle with curved sides, and the output shaft 2 is adjacent to the driving frame 9 at the matching position. It enables the output shaft 2 and the drive frame 9 to have a rotational degree of freedom of less than 120 °, and the specific angle can be set by the size of the gap between the output shaft 2 and the drive frame 9 and the size of the curved triangle. And the triangular fit can make the fit between the output shaft 2 and the driving frame 9 more stable.

In order to improve the stability of self-locking, the driving blocks 91 are three and uniformly distributed on the circumference of the output shaft 2. The self-locking pins 8 are three and are respectively positioned in the gaps between a group of adjacent driving blocks 91. The flat positions 21 are three and are respectively positioned at three corners of the curved triangle. Preferably, the self-locking pin 8 is cylindrical.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides an output shaft self-lock device of electric drill which characterized in that, is including rotating output shaft and the drive frame that sets up in the gear box to and the retaining ring of fixed setting in the gear box, the afterbody of output shaft inserts in the drive frame, and has the rotational degree of freedom that is less than 360 between each other, the drive frame is provided with the drive block along the axial, flat position has been seted up on the output shaft, flat position has placed the self-locking round pin, drive block and self-locking round pin all are located between output shaft and the retaining ring, flat position is greater than the difference of the inner circle radius of retaining ring and the diameter of self-locking round pin to the maximum distance at the center of rotation, and the minimum distance is less than the difference of the inner circle radius of retaining ring and the diameter of self-locking round pin.

2. The self-locking device for the output shaft of the electric drill as claimed in claim 1, wherein the output shaft and the driving rack are engaged, and the minimum distance between the driving rack and the rotation center is smaller than the maximum distance between the output shaft and the rotation center.

3. The self-locking device for the output shaft of the electric drill as claimed in claim 1, wherein the cross section of the engagement part of the output shaft and the driving frame is a triangle with curved sides, and the engagement part of the output shaft is adjacent to the driving frame.

4. The self-locking device for the output shaft of the electric drill is characterized in that the number of the driving blocks is three, the driving blocks are evenly distributed on the periphery of the output shaft, the number of the self-locking pins is three, the self-locking pins are respectively positioned in gaps between a group of adjacent driving blocks, and the number of the flat positions is three, and the flat positions are respectively positioned at three corners of a triangle with a curved side.

5. The self-locking device for the output shaft of the electric drill as claimed in claim 4, wherein the self-locking pin is cylindrical.

6. The self-locking device for the output shaft of the electric drill as claimed in claim 1, wherein a first bearing, a clamp spring and a second bearing are sequentially arranged on the output shaft in a penetrating manner, and the output shaft, the first bearing, the clamp spring and the second bearing are together pressed in the gear box.

7. The self-locking device for the output shaft of the electric drill as claimed in claim 6, wherein a gasket is arranged between the second bearing and the stop ring.

8. The self-locking device for the output shaft of the electric drill as claimed in claim 1, wherein the gear box is fixedly arranged on a housing of the electric tool, and the driving frame is connected with the driving end of the electric tool.

9. The self-locking device for the output shaft of the electric drill as set forth in claim 1, wherein the head of the output shaft is provided with a thread for mounting an external accessory.

10. The self-locking device for the output shaft of the electric drill as claimed in claim 1, wherein the circumference of the stop ring is provided with a projection, the gear box is provided with a groove, and the projection is clamped in the groove.