CN209774498U

CN209774498U - Hand-held electric tool

Info

Publication number: CN209774498U
Application number: CN201920454871.9U
Authority: CN
Inventors: 赵小哲
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2019-04-04
Filing date: 2019-04-04
Publication date: 2019-12-13
Anticipated expiration: 2029-04-04

Abstract

The utility model discloses a hand-held type electric tool, it belongs to electric tool technical field, hand-held type electric tool include the motor and with the drive mechanism that the motor is connected, the motor has the output shaft around the rotation of primary shaft line, drive mechanism includes master gear and ring gear, the master gear with output shaft connection, the ring gear with master gear meshing, the ring gear is rotatory around the secondary shaft line, the secondary shaft line with the parallel and interval setting of primary shaft line. The power is transmitted to the bevel gear mechanism by the inner gear ring, a complex planet gear mechanism is omitted, the distance between the first axis and the second axis can be reduced, the purpose of saving space is achieved, and the overall size of the handheld electric tool is reduced.

Description

Hand-held electric tool

Technical Field

the utility model relates to an electric tool technical field especially relates to a hand-held type electric tool.

Background

The hand-held electric tool comprises an electric drill, an electric hammer, an electric wrench and the like, and is very widely applied. Generally, a hand-held electric tool is composed of a housing, a motor, a working head, a control switch and a handle. The motor is used for driving the working head to move, and a speed reducer is arranged between the motor and the working head.

The speed reducer mostly adopts two-stage speed reduction or three-stage speed reduction to improve the working efficiency of the motor. Generally include planetary wheel mechanism in the reduction gear, planetary wheel mechanism structure is complicated, and sun gear, planet wheel etc. occupy great space for hand-held type electric tool's volume is great, can't adapt to the installation operation of the less position department in space, and the use is limited.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a hand-held type electric tool to solve the hand-held type electric tool volume that exists among the prior art great, the little technical problem of adaptable scope.

As the conception, the utility model adopts the technical proposal that:

A hand held power tool including a motor and a transmission connected to the motor, the motor having an output shaft that rotates about a first axis, the transmission comprising:

the main gear is connected with the output shaft;

The inner gear ring is meshed with the main gear, rotates around a second axis, and is parallel to the first axis and arranged at intervals.

Wherein the hand-held power tool further comprises an impact assembly connected with the transmission mechanism.

wherein, drive mechanism still includes:

The bevel gear mechanism is connected with the inner gear ring;

And the input end of the parallel gear mechanism is connected with the bevel gear mechanism, and the output end of the parallel gear mechanism is connected with the impact assembly.

The motor is characterized by further comprising a fixedly arranged supporting seat, the output shaft is rotatably connected with the supporting seat, and the main gear is located on one side, far away from the motor, of the supporting seat.

wherein, a through hole is arranged on the supporting seat, and a first bearing assembly is arranged between the output shaft and the through hole.

The fan is connected with the output shaft and is positioned between the supporting seat and the motor.

The inner gear ring comprises an engaging part and a supporting part connected with the engaging part, the engaging part is engaged with the main gear, and the supporting part is connected with the bevel gear mechanism.

the motor, the transmission mechanism and the impact assembly are all located in the shell, and a heat dissipation channel is arranged in the shell.

The casing includes first casing and the second casing that can dismantle the setting, drive mechanism with strike the subassembly and all be located in the first casing, the motor with heat dissipation channel set up in the second casing.

The bevel gear mechanism comprises a bevel gear shaft and a bevel gear meshed with the bevel gear shaft, the bevel gear shaft is connected with the inner gear ring in a key mode, and the axis of the bevel gear shaft is overlapped with the second axis.

the utility model has the advantages that:

The utility model provides a hand-held type electric tool, through setting up the master gear on the output shaft of motor, and set up in the ring gear of master gear meshing, and then transmit power to bevel gear mechanism with the help of the ring gear, complicated planet wheel mechanism has been left out, make the interval between first axis and the second axis can reduce, and then reach the purpose in space-saving, reduce hand-held type electric tool's whole volume, the production cost is reduced, can adapt to less spatial position's installation operation, adaptable scope is wide.

drawings

Fig. 1 is a schematic structural diagram of a handheld electric tool provided in an embodiment of the present invention;

Fig. 2 is an exploded schematic view of a partial structure of a hand-held electric tool according to an embodiment of the present invention;

FIG. 3 is an exploded view of a portion of the structure of FIG. 2;

fig. 4 is a sectional view of a partial structure of a hand-held power tool according to an embodiment of the present invention;

Fig. 5 is a schematic diagram of a portion of the structure in fig. 4.

In the figure:

1. A housing; 11. a heat dissipation channel; 12. a first housing; 13. a second housing; 14. a cover body; 15. a grip portion;

2. A motor; 21. an output shaft;

3. A transmission mechanism; 31. a main gear; 32. an inner gear ring; 321. an engaging portion; 322. a support portion; 33. a bevel gear shaft; 34. a bevel gear; 35. a first drive shaft; 36. a first gear; 37. a second gear;

4. An impact assembly; 41. a support shaft; 42. a spring; 43. an energy storage block; 44. an impact block;

5. a supporting seat;

6. a fan.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

in the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

the technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

referring to fig. 1 and 2, an embodiment of the present invention provides a handheld electric tool, which may be an angular impact wrench, for tightening a screw, and of course, the handheld electric tool may also be an impact screwdriver, an impact drill, an electric screwdriver, an electric drill, an electric hammer, etc., without limitation.

Hand-held type electric tool includes casing 1, motor 2, drive mechanism 3 and strikes subassembly 4, and motor 2 has the output shaft 21 around first axis rotation, and output shaft 21 is connected with drive mechanism 3, and drive mechanism 3 is connected with striking subassembly 4, and motor 2, drive mechanism 3 and striking subassembly 4 all are located casing 1.

A heat dissipation channel 11 is provided in the casing 1 for discharging heat inside the casing 1.

The machine shell 1 comprises a first shell 12 and a second shell 13 which are detachably connected, the transmission mechanism 3 and the impact assembly 4 are both positioned in the first shell 12, and the motor 2 and the heat dissipation channel 11 are both positioned in the second shell 13. The first housing 12 and the second housing 13 are detachably connected to facilitate installation and maintenance.

A cover 14 is detachably disposed on the first housing 12, and the cover 14 is used to enclose the transmission mechanism 3 in the first housing 12. The second shell 13 is provided with a holding part 15, and the holding part 15 is provided with grains, so that the friction force is increased conveniently.

Referring to fig. 3 to 5, the transmission mechanism 3 includes a main gear 31, an inner gear ring 32, a bevel gear mechanism, and a parallel gear mechanism, which are connected in this order. The main gear 31 and the inner gear ring 32 serve as a first-stage speed reducing mechanism, the bevel gear mechanism serves as a second-stage speed reducing mechanism and has a reversing function, the parallel gear mechanism serves as a third-stage speed reducing mechanism, and the multi-stage speed reducing mechanism ensures that the impact assembly 4 runs stably so as to improve the working efficiency of the motor 2.

The main gear 31 is connected with the output shaft 21 of the motor 2, the inner gear ring 32 is meshed with the main gear 31, and the inner gear ring 32 rotates around a second axis which is parallel to and spaced from the first axis. The main gear 31 is arranged on the output shaft 21 of the motor 2, the inner gear ring 32 meshed with the main gear 31 is arranged, and power is transmitted to the bevel gear mechanism through the inner gear ring 32, so that a complex planetary gear mechanism is omitted, the distance between the first axis and the second axis can be reduced, the purpose of saving space is achieved, the overall size of the handheld electric tool is reduced, the production cost is reduced, the handheld electric tool can adapt to installation operation of smaller spatial positions, and the handheld electric tool is wide in adaptable range.

In order to ensure that the output shaft 21 rotates stably, a supporting seat 5 is provided, the supporting seat 5 is fixedly connected with the machine shell 1, the output shaft 21 is rotatably connected with the supporting seat 5, and the main gear 31 is positioned on one side of the supporting seat 5 far away from the motor 2. Because the output shaft 21 has a certain extension length, the support seat 5 provides support for the output shaft 21, and prevents the output shaft 21 from being deformed by force to affect normal operation.

the support base 5 is provided with a through hole, and a first bearing assembly is arranged between the output shaft 21 and the through hole. The main gear 31 and the output shaft 21 may be in a key connection or an interference fit. In order to ensure the strength of the main gear 31, the main gear 31 has a long axial length, the main gear 31 includes a gear tooth portion and an extension shaft, and the extension shaft extends into the through hole after the main gear 31 is mounted on the output shaft 21, thereby fully utilizing the space.

In order to improve the heat dissipation efficiency, a fan 6 is arranged on the output shaft 21, and the fan 6 is in key connection with the output shaft 21 and is positioned between the supporting seat 5 and the motor 2. When the output shaft 21 rotates, the fan 6 is driven to rotate, and heat dissipation airflow is formed. The fan 6 is located at one end of the heat dissipation channel 11, and the other end of the heat dissipation channel 11 is communicated with the outside.

The ring gear 32 includes an engaging portion 321 and a supporting portion 322 connected to the engaging portion 321, the engaging portion 321 being engaged with the main gear 31, the supporting portion 322 being connected to the bevel gear mechanism.

the bevel gear mechanism comprises a bevel gear shaft 33 and a bevel gear 34 meshed with the bevel gear shaft 33, the bevel gear shaft 33 is in key connection with the inner gear ring 32, and the axis of the bevel gear shaft 33 is overlapped with the second axis. The support portion 322 of the ring gear 32 is provided with a mounting hole along the second axis, and a part of the bevel gear shaft 33 is located in the mounting hole. The main gear 31 transmits power to the ring gear 32, the ring gear 32 transmits power to the bevel gear shaft 33, the bevel gear shaft 33 transmits power to the bevel gear 34, and commutation is achieved.

the input end of the parallel gear mechanism is connected with the bevel gear mechanism, and the output end of the parallel gear mechanism is connected with the impact assembly 4. The parallel gear mechanism comprises a first transmission shaft 35 and a first gear 36 and a second gear 37 which are meshed with each other, the first gear 36 and the bevel gear 34 being connected with the first transmission shaft 35. Bevel gear 34 transmits power to a first transmission shaft 35, first transmission shaft 35 transmits power to a first gear 36, and first gear 36 transmits power to a second gear 37.

The impact assembly 4 comprises a support shaft 41 and an impact part, the second gear 37 and the impact part are both connected with the support shaft 41, and a spring 42 is sleeved on the support shaft 41 between the second gear 37 and the impact part. The second gear 37 transmits power to the support shaft 41, thereby operating the striking part.

The impact portion comprises an energy storage block 43 and an impact block 44, the energy storage block 43 is sleeved on the support shaft 41 and is in sliding connection with the support shaft 41, specifically, the support shaft 41 is a cam shaft, and when the support shaft 41 rotates, the energy storage block 43 can be driven to rotate and move along the axial direction of the support shaft 41. The impact block 44 is disposed at one end of the support shaft 41 and connected to the energy storage block 43, and the spring 42 is located between the second gear 37 and the energy storage block 43.

During energy storage, the support shaft 41 rotates to drive the energy storage block 43 to move along the axial direction of the support shaft 41 while rotating, and the energy storage block 43 compresses the spring 42 to store energy. During impact, the support shaft 41 stops rotating, the spring 42 is released, the energy storage block 43 is pushed to move reversely along the axial direction of the support shaft 41 while rotating, and the impact block 44 is driven to feed while rotating.

The above embodiments have been described only the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and is not departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A hand held power tool comprising an electric motor (2) and a transmission mechanism (3) connected to the electric motor (2), the electric motor (2) having an output shaft (21) rotating about a first axis, characterized in that the transmission mechanism (3) comprises:

A main gear (31) connected to the output shaft (21);

and the inner gear ring (32) is meshed with the main gear (31), the inner gear ring (32) rotates around a second axis, and the second axis is parallel to the first axis and is arranged at intervals.

2. The hand-held power tool according to claim 1, characterized in that it further comprises an impact assembly (4) connected to the transmission mechanism (3).

3. The hand-held power tool according to claim 2, characterized in that the transmission mechanism (3) further comprises:

The bevel gear mechanism is connected with the inner gear ring (32);

and the input end of the parallel gear mechanism is connected with the bevel gear mechanism, and the output end of the parallel gear mechanism is connected with the impact assembly (4).

4. The hand-held power tool according to claim 1, further comprising a fixedly arranged support (5), wherein the output shaft (21) is rotatably connected to the support (5), and wherein the main gear (31) is located on a side of the support (5) remote from the motor (2).

5. the hand-held power tool according to claim 4, wherein the support base (5) has a through hole formed therein, and a first bearing assembly is provided between the output shaft (21) and the through hole.

6. Hand-held power tool according to claim 4, characterised in that it further comprises a fan (6), said fan (6) being connected to said output shaft (21) and being located between said support (5) and said motor (2).

7. Hand-held power tool according to claim 3, characterized in that the inner gear ring (32) comprises an engagement portion (321) and a support portion (322) connected with the engagement portion (321), the engagement portion (321) engaging with the main gear (31), the support portion (322) being connected with the bevel gear mechanism.

8. The hand-held power tool according to claim 2, further comprising a housing (1), wherein the motor (2), the transmission mechanism (3) and the impact assembly (4) are all located in the housing (1), and a heat dissipation channel (11) is provided in the housing (1).

9. The hand-held power tool according to claim 8, characterized in that the housing (1) comprises a first housing (12) and a second housing (13) which are detachably arranged, the transmission mechanism (3) and the impact assembly (4) are both located in the first housing (12), and the motor (2) and the heat dissipation channel (11) are arranged in the second housing (13).

10. The hand-held power tool according to claim 3, wherein the bevel gear mechanism comprises a bevel gear shaft (33) and a bevel gear (34) engaged with the bevel gear shaft (33), the bevel gear shaft (33) is connected with the internal gear ring (32) in a key manner, and the axis of the bevel gear shaft (33) is coincident with the second axis.