CN213701888U

CN213701888U - Electric hand drill

Info

Publication number: CN213701888U
Application number: CN202022414419.5U
Authority: CN
Inventors: 彭小湖; 黄海彬
Original assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Current assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Priority date: 2020-10-26
Filing date: 2020-10-26
Publication date: 2021-07-16
Anticipated expiration: 2030-10-26

Abstract

The utility model relates to an electric hand drill, which comprises a casing, a motor arranged in the casing, a transmission structure driven by the motor and an output shaft driven by the transmission structure, wherein the motor is positioned at the rear side of the transmission structure and is provided with a motor shaft extending forwards; the output shaft extends through the center of the transmission gear and is offset from the motor shaft, the transmission gear comprises a first part and a second part, the first part is located at the rear end, the second part is located at the front end, the first part is provided with a connecting cavity which is inwards sunken from the rear end face, and the motor shaft is meshed with the connecting cavity. The utility model discloses a with the first part of drive gear one end and motor shaft through internal gearing, the second part and the planetary gear train meshing of the other end, compact structure intensity is high, and can keep the grease in drive gear's connection cavity, and motor gear's lubricated effect is better, effectively prolongs motor gear's life-span.

Description

Electric hand drill

[ technical field ] A method for producing a semiconductor device

The utility model relates to an electric hand drill, in particular to an electric hand drill that occasions such as fitment, building were used.

[ background of the invention ]

The electric hand drill is an electric tool driven by an output shaft driven by a motor, is widely applied to industries such as buildings, decorations, furniture and the like, and is used for drilling holes or penetrating objects on objects. The existing electric hand drill adopts two-stage external gear transmission and is provided with a motor shaft, an intermediate shaft and an output shaft, and the axes of the three shafts are in a triangular layout, so that the electric hand drill cannot achieve bilateral symmetry and is not attractive in appearance.

Aiming at the improvement of the existing electric hand drill, the utility model patent No. 201120104532.1 published in No. 2011, 11, 23 discloses a pistol type electric drill, which comprises a machine body, a head shell, a motor shaft, a gear and an output shaft, wherein the motor shaft is meshed with the gear, and the output shaft is fixedly connected with the gear. The structure only has two axes of the motor shaft and the output shaft, the structure is compact, but because the motor shaft and the gear are in external meshing transmission, grease is easy to throw off due to centrifugal force, the lubricating effect is poor, and the motor gear is easy to wear; and the motor shaft and the gear are in external meshing transmission, so that the occupied volume is large, and the miniaturization of the electric hand drill is not facilitated.

Accordingly, there is a need for an improved hand drill that overcomes the deficiencies of the prior art.

[ Utility model ] content

To the not enough of prior art, the utility model aims to provide a compact structure and durable electric hand drill.

The utility model provides a prior art problem can adopt following technical scheme: an electric hand drill comprises a machine shell, a motor, a transmission structure and an output shaft, wherein the motor is arranged in the machine shell, the transmission structure is driven by the motor, the output shaft is driven by the transmission structure, the motor is positioned at the rear side of the transmission structure and is provided with a motor shaft extending forwards, the transmission structure comprises a transmission gear meshed with the front end of the motor shaft, and the output shaft is driven by the transmission gear; the output shaft extends through the center of the transmission gear and is offset from the motor shaft, the transmission gear comprises a first part and a second part, the first part is located at the rear end, the second part is located at the front end, the first part is provided with a connecting cavity which is recessed inwards from the rear end, and the motor shaft is meshed with the connecting cavity.

The further improvement scheme is as follows: the transmission structure comprises a plurality of planetary gears meshed with the front ends of the transmission gears and a planet carrier driven by the planetary gears, and the output shaft is fixedly connected to the planet carrier.

The further improvement scheme is as follows: the second part protrudes forwards from the front end face of the first part, the second part is meshed with the planetary gears, and the plurality of planetary gears are uniformly distributed around the circumference of the second part.

The further improvement scheme is as follows: the first portion and the second portion are of a unitary construction.

The further improvement scheme is as follows: the first part and the second part are of split structures, and the second part is fixedly connected to the first part.

The further improvement scheme is as follows: the electric hand drill comprises a casing, a transmission structure, an output shaft, a motor shaft, a transmission structure and an electric hand drill, wherein the output shaft and the motor shaft are parallel to each other, the electric hand drill comprises a head casing fixed on the front side of the casing, the transmission structure and the output shaft are installed in the head casing, the motor shaft forwardly protrudes into the head casing, and the output shaft forwardly protrudes out of the.

The further improvement scheme is as follows: the electric hand drill comprises an intermediate cover positioned between the machine shell and the head shell, and screws sequentially penetrate through the head shell and the intermediate cover and are fixed to the machine shell.

The further improvement scheme is as follows: the transmission structure comprises a first bearing arranged on the rear side of the transmission gear and a second bearing arranged on the front side of the planet carrier, the first bearing is arranged in the middle cover, the second bearing is arranged in the head shell, and the first bearing and the second bearing are supported at two ends of the output shaft.

The further improvement scheme is as follows: the transmission structure includes a third bearing between the first bearing and the second bearing, the third bearing being supported between the output shaft and the transmission gear.

The further improvement scheme is as follows: the transmission structure comprises an inner gear ring sleeved on the outer side of the planetary gear, the inner gear ring is fixed in the head shell, and the planetary gear is internally meshed with the inner gear ring.

Compared with the prior art, the utility model discloses following beneficial effect has: the first part at one end of the transmission gear is meshed with the motor shaft through the internal teeth, the second part at the other end of the transmission gear is meshed with the planetary gear train, the structure is compact, the strength is high, grease can be kept in the connecting cavity of the transmission gear, the lubricating effect of the motor gear is better, and the service life of the motor gear is effectively prolonged; the transmission gear and the output shaft are in transmission through a planetary gear train, and a plurality of planetary gears can be arranged to share the torsion, so that the electric hand drill is suitable for a high-power electric hand drill.

[ description of the drawings ]

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings:

fig. 1 is a schematic view of the whole electric hand drill of the utility model;

figure 2 is a cross-sectional view of the electric hand drill of figure 1;

figure 3 is an enlarged view of circle a of the power hand drill of figure 2;

figure 4 is an exploded view of the motor and drive structure of the electric hand drill of figure 1.

The meaning of the reference symbols in the figures:

100. the electric hand drill 1, the machine shell 2, the motor 21, the motor shaft 3, the transmission structure 31, the transmission gear 311, the first part 312, the connecting cavity 313, the second part 32, the planetary gear 33, the planet carrier 34, the inner gear ring 35, the first bearing 36, the second bearing 37, the third bearing 4, the output shaft 5, the head shell 6, the holding part 7, the rear handle 8, the auxiliary handle 9, the middle cover 10 and the drill chuck

[ detailed description ] embodiments

The present invention will be described in further detail with reference to the accompanying drawings and embodiments.

Referring to fig. 1 and 2, an embodiment of the present invention relates to an electric hand drill 100, where the electric hand drill 100 includes a casing 1, a motor 2 installed in the casing 1, a transmission structure 3 driven by the motor 2, an output shaft 4 driven by the transmission structure 3, a head casing 5 fixed on the front side of the casing 1, and a middle cover 9 located between the casing 1 and the head casing 5, the transmission structure 3 and the output shaft 4 are installed in the head casing 5, the motor 2 is located on the rear side of the transmission structure 3 and has a motor shaft 21 extending forward, the motor shaft 21 protrudes forward into the head casing 5, the output shaft 4 protrudes forward out of the head casing 5, and the end of the output shaft 4 is connected with a drill chuck 10; be equipped with the screw seat of installation screw on casing 1, be equipped with the screw hole corresponding with the screw seat on first shell 5 and the middle lid 9, the screw passes first shell 5 and the screw hole of middle lid 9 in proper order to finally screw up in fixed to casing 1's the screw seat.

In the present embodiment, the electric hand drill 100 further includes a grip portion 6 connected to a lower side of the housing 1, a rear handle 7 connected to a rear side of the housing 1, and an auxiliary handle 8 provided on an upper side of the housing 1, wherein the grip portion 6 is non-detachably connected to the housing 1, and the rear handle 7 and the auxiliary handle 8 are detachably connected to the housing 1. Therefore, an operator can flexibly select to use the single handle for operation, or install the rear handle 7 or the auxiliary handle 8 for auxiliary operation, and the operation diversity is increased.

Referring to fig. 3 and 4, the transmission structure 3 includes a transmission gear 31 engaged with the front end of the motor shaft 21, and a planetary gear train engaged with the front end of the transmission gear 31, the planetary gear train includes a plurality of planetary gears 32 engaged with the front end of the transmission gear 31, a planet carrier 33 driven by the planetary gears 32, and an inner gear ring 34 sleeved outside the planetary gears 32, the inner gear ring 34 is fixed in the head housing 5, the planetary gears 32 are engaged with the inner gear ring 34 and rotate in the inner gear ring 34, the output shaft 4 is fixedly connected to the planet carrier 33, and the output shaft 4 is driven by the transmission gear 31. The transmission gear 31 and the output shaft 4 are in planetary gear train transmission, and a plurality of planetary gears 32 can be arranged to share torsion, so that the electric hand drill 100 is suitable for a high-power electric hand drill.

In this embodiment, the output shaft 4 and the motor shaft 21 are parallel to each other, the output shaft 4 extends through the center of the transmission gear 31 and is offset from the motor shaft 21, the transmission gear 31 includes a first portion 311 at the rear end and a second portion 313 engaged with the planetary gear 32, the second portion 313 is located at the front end of the transmission gear 31, the first portion 311 has a connection chamber 312 recessed inward from the rear end, the motor shaft 21 protrudes into the connection chamber 312 and is engaged with the first portion 311; the second portion 313 projects forward from the front end surface of the first portion 311, and the plurality of planetary gears 32 are evenly distributed around the circumference of the second portion 313. The first part 311 at one end of the transmission gear 31 is meshed with the motor shaft 21 through internal teeth, the second part 313 at the other end is meshed with the planetary gear train, the structure is compact, the strength is high, grease can be kept in the connecting cavity 312 of the transmission gear 31, the lubricating effect of the motor gear is better, and the service life of the motor gear is effectively prolonged.

Referring to fig. 3, in the present embodiment, the first portion 311 and the second portion 313 of the transmission gear 31 are a split structure, and the second portion 313 is fixedly connected to the first portion 311. Optionally, the second portion 313 is a spline, one end of the spline is fixed to the inner side of the first portion 311, and the other end of the spline is connected to the inner side of the planetary gear 32; in addition, the second portion 313 may also be fixedly coupled to the first portion 311 by press-fitting.

In another embodiment, the first portion 311 and the second portion 313 may be an integral structure to reduce the number of parts and improve the assembling efficiency.

Referring to fig. 3 and 4, the transmission structure 3 further includes a first bearing 35 disposed at the rear side of the transmission gear 31, a second bearing 36 disposed at the front side of the planet carrier 33, and a third bearing 37 disposed between the first bearing 35 and the second bearing 36, the first bearing 35 is mounted in the middle cover 9, the second bearing 36 is mounted in the head housing 5, and the first bearing 35 and the second bearing 36 are supported at two ends of the output shaft 4; and a third bearing 37 is supported between the output shaft 4 and the transmission gear 31.

The utility model discloses a with the first part 311 and the motor shaft 21 of drive gear 31 one end by internal gearing, the second part 313 and the planetary gear train meshing of the other end, compact structure intensity is high, and can keep the grease in drive gear 31's connection cavity 312, and motor gear lubrication effect is better, effectively prolongs motor gear's life-span. The transmission gear 31 and the output shaft 4 are in planetary gear train transmission, and a plurality of planetary gears 32 can be arranged to share torsion, so that the electric hand drill 100 is suitable for a high-power electric hand drill.

The present invention is not limited to the above-described embodiments. It will be readily appreciated by those skilled in the art that many other alternatives to the electric hand drill may be devised without departing from the spirit and scope of the invention. The protection scope of the present invention is subject to the content of the claims.

Claims

1. An electric hand drill comprises a machine shell, a motor, a transmission structure and an output shaft, wherein the motor is arranged in the machine shell, the transmission structure is driven by the motor, the output shaft is driven by the transmission structure, the motor is positioned at the rear side of the transmission structure and is provided with a motor shaft extending forwards, the transmission structure comprises a transmission gear meshed with the front end of the motor shaft, and the output shaft is driven by the transmission gear; the method is characterized in that: the output shaft extends through the center of the transmission gear and is offset from the motor shaft, the transmission gear comprises a first part and a second part, the first part is located at the rear end, the second part is located at the front end, the first part is provided with a connecting cavity which is recessed inwards from the rear end, and the motor shaft is meshed with the connecting cavity.

2. An electric hand drill according to claim 1 wherein: the transmission structure comprises a plurality of planetary gears meshed with the front ends of the transmission gears and a planet carrier driven by the planetary gears, and the output shaft is fixedly connected to the planet carrier.

3. An electric hand drill according to claim 2 wherein: the second part protrudes forwards from the front end face of the first part, the second part is meshed with the planetary gears, and the plurality of planetary gears are uniformly distributed around the circumference of the second part.

4. An electric hand drill according to claim 3 wherein: the first portion and the second portion are of a unitary construction.

5. An electric hand drill according to claim 3 wherein: the first part and the second part are of split structures, and the second part is fixedly connected to the first part.

6. An electric hand drill according to claim 2 wherein: the electric hand drill comprises a casing, a transmission structure, an output shaft, a motor shaft, a transmission structure and an electric hand drill, wherein the output shaft and the motor shaft are parallel to each other, the electric hand drill comprises a head casing fixed on the front side of the casing, the transmission structure and the output shaft are installed in the head casing, the motor shaft forwardly protrudes into the head casing, and the output shaft forwardly protrudes out of the.

7. An electric hand drill according to claim 6 wherein: the electric hand drill comprises an intermediate cover positioned between the machine shell and the head shell, and screws sequentially penetrate through the head shell and the intermediate cover and are fixed to the machine shell.

8. An electric hand drill according to claim 7 wherein: the transmission structure comprises a first bearing arranged on the rear side of the transmission gear and a second bearing arranged on the front side of the planet carrier, the first bearing is arranged in the middle cover, the second bearing is arranged in the head shell, and the first bearing and the second bearing are supported at two ends of the output shaft.

9. An electric hand drill according to claim 8 wherein: the transmission structure includes a third bearing between the first bearing and the second bearing, the third bearing being supported between the output shaft and the transmission gear.

10. An electric hand drill according to claim 6 wherein: the transmission structure comprises an inner gear ring sleeved on the outer side of the planetary gear, the inner gear ring is fixed in the head shell, and the planetary gear is internally meshed with the inner gear ring.