DE212021000369U1 - Hand-held electric screwdriver system - Google Patents

Abstract

Hand-held electric screwdriver system comprising a screwdriver body, a servo driver, a power module and a microcontroller MCU, the power module including a switching power and a drive power, the switching power being supplied to the microcontroller MCU, the drive power being supplied to the servo driver, the Microcontroller MCU controls the servo driver, wherein the servo driver drives the screwdriver body, and wherein a servo motor is arranged in the screwdriver body.

Description

field of invention

The invention relates to the field of automated intelligent machining technology, particularly to a hand-held electric screwdriver for screw tightening and a system using this electric screwdriver.

State of the art

In the field of automatic machining technology, the mechanical tightening technique of bolts on the mechanized assembly line is a high-precision, high-efficiency, and high-stability tooling process. In general, a motor-driven screwdriver is installed on a robot arm to quickly and automatically tighten the screws that need to be tightened. This type of screwdriver installed on a movable robot arm is carried and positioned at a predetermined tightening work position by the robot arm. It is commonly referred to in the industry as an onboard screwdriver. At present, there is also a type of electric screwdriver. The screwdriver that is held and moved by the user is referred to as a hand-held electric screwdriver. This screwdriver has flexibility and high accuracy and efficiency. After manually positioning and aligning with the screw to be tightened, the screwdriver head is electrically driven to rotate, quickly tightening the screw. It is widely used in products with more variable and complex jobs and products with higher precision and technical requirements.

Most common handheld electric screwdrivers on the market are powered by brushed motors. The brush motor has a complex structure, poor reliability, high failure rate, intensive maintenance work, and short life. In addition, the commutation spark can easily generate electromagnetic interference. In addition, when the ordinary hand-held electric screwdriver tightens the screw, the torque deviation is relatively large and the tightening consistency is not good because the power output from the motor is transmitted through a reduction gear. As a result, abnormal conditions such as overtightening, damage, or undertightening occur. Finally, as the screw is tightened by the screwdriver, the screwdriver head is subjected to an opposing upward thrust. This impact force puts a large axial load on the reducer/motor. In use, the life of the reducer/motor will be greatly reduced. The most important thing is that the current hand-held screwdriver is just a simple motor-driven rotary tool and is not equipped with MCU/PLC. Functions such as torque detection, comparison, error correction and query cannot be performed. Data cannot be backed up or stored for retrieval.

object of the invention

Based on the above problems, the invention provides a hand-held electric screwdriver system which has a simple structure, good reliability, low failure rate, long service life and greatly reduced axial load on the reducer/motor. The system includes a servo driver, an electric screwdriver and a microcontroller, increasing efficiency, reliability and practical performance. The service life of the screwdriver is extended. At the same time, the system is equipped with an intelligent management system, and the system is connected to the cloud through network communication to store, backup and transmit the data. Therefore, the potential and possibilities of the intelligence of the overall system and digital control are significantly increased.

The hand-held electric screwdriver system includes a screwdriver body, a servo driver, a power module and a microcontroller MCU, the power module includes a switching power and a drive power, the switching power is supplied to the microcontroller MCU, the drive power is supplied to the servo driver, the microcontroller MCU controls the servo driver, the servo driver drives the screwdriver body, and a servo motor is arranged in the screwdriver body.

The microcontroller MCU has communication interfaces, the communication interfaces containing rs232, rs485, RJ45, IO input and IO output.

The handheld screwdriver system still includes external devices connected via the buses, the external devices contain a man-machine interface and a code reader, the external devices are connected to the microcontroller MCU via RS232 and RS485 bus, where the man-machine interface includes an LCD display, a touch screen, includes physical buttons and LED displays, with the exchange of information with the microcontroller MCU and the data display being realized by buses and communication interfaces.

After connecting the code reader and the screwdriver system, the workpiece number is read by the code reader. The specific information is linked to the workpiece number and saved.

The system still includes single-chip PLC and PC background, where the single-chip PLC is connected to the microcontroller MCU via the bus, where the screw feeding system is controlled by the single-chip PLC, where the data from the single -Chip-PLC to be uploaded to the PC wallpaper, and the PC wallpaper is connected to the cloud via Ethernet.

The PC background can be connected to the bulk system, cloud, etc. through the firewall.

The switching power contains three kinds of power DC12V, DC5V, DC3.3V, where 3.3V is used to power the microcontroller MCU, the man-machine interface and hand-held code reader through the RS232, RS485 bus with the Screwdriver system are connected to set and read the operating parameters, and after connecting the code reader and the screwdriver system, the workpiece number is read from the code reader and the specific information is linked with the workpiece number and stored.

The screwdriver body has a housing, a servo motor, a planetary reduction gear, a transmission part, connecting elements and a front cap, characterized in that the planetary reduction gear is added between the servo motor and the transmission part, the planetary reduction gear entrains the connecting elements through the transmission part, the housing and the toe cap are mounted on the outside, bringing a different specification blade to the connectors; and that the servo motor is coupled to the planetary reduction gear through a pinion, the transmission part being a transmission pin and the connecting member being a blade sleeve, the shaft of the planetary reduction gear being inserted into the blade sleeve through the transmission pin, the rear end of the blade sleeve being assembled with the transmission pin and the front end is for fixing the blade, and a bearing is provided around the blade sleeve.

The transmission part and the connecting element are a flat transmission pin and a hexagonal blade sleeve or the transmission part and the connecting element are a long transmission pin and a notched end blade sleeve.

When the transmission part and the connecting element are a flat transmission pin and a hexagonal blade sleeve, the shaft of the planetary reduction gear is inserted through the flat transmission pin into the hexagonal blade sleeve, with the rear end of the hexagonal blade sleeve being assembled with the flat transmission pin, and the front end to the Fixation of the blade is used.

When the transmission part and the connecting member are a long transmission pin and a notched-end blade sleeve, the shaft of the planetary reduction gear is inserted through the long transmission pin into the notched-end blade sleeve, with the pin of the long transmission pin inserted into the rear end of the blade sleeve, where a notched end drive block is provided in the notched end blade sleeve and the end of the blade is inserted into the blade sleeve to cooperate with the drive block in the blade sleeve.

A motor mount is provided between the servomotor and the planetary reduction gear, and the pinion is interposed between the motor mount and the planetary reduction gear.

The shaft of the planetary reduction gear is directly inserted into the flat transmission pin, with a reduction gear mounting ring placed on the outside of the junction of the planetary reduction gear and the flat transmission pin, with the reduction gear mounting ring fixed by screws to the planetary reduction gear, and with its end face on the housing, with the flat transmission pin inserted directly into the flat hole at the rear end of the hexagonal blade sleeve, with the deep groove ball bearing and spacer ring placed around the hexagonal blade sleeve, with the end face of the deep groove ball bearing abutting the spacer ring, and with the other end face of the spacer ring against the reducer mounting ring.

The reducer mounting ring is fitted on the side facing the spacer ring with a Recess provided in which a part of the spacer ring is received.

The deep groove ball bearing and the hexagonal blade sleeve are axially positioned and clamped by a snap ring.

The outer wall of the hexagonal blade sleeve is provided with a snap ring groove, with one part of the snap ring engaging in the snap ring groove and the other part resting against the front end of the deep groove ball bearing.

The outside of the hexagonal blade sleeve is covered by the front cap, with a disassembly sleeve provided between the hexagonal blade sleeve and the front cap, the front end of the disassembly sleeve being snapped by the locking ring in the compression spring, with between the inner wall of the disassembly sleeve and the hexagonal blade sleeve a Groove is formed, and wherein the compression spring engages in the groove.

A thread protection sleeve is provided on the outside of the toe cap. An industrial connector and hook are provided at the rear end of the housing, which is convenient for hand-held construction and connecting the hand-held screwdriver with the circuit.

A start switch and a forward and reverse push button are arranged on the housing. The start switch is electrically connected to the start switch circuit board. The forward and reverse push button is electrically connected to the forward and reverse push button circuit board.

The hand-held electric screwdriver system of the invention is equipped with a microcontroller. The microcontroller controls the servo driver. The servo driver drives the servo motor in the screwdriver body to perform tightening. Connected to the network through various data interfaces, the microcontroller stores, backups and transmits the settings and parameters of the attraction process, which can realize the intelligent and digital control operations such as remote management and data analysis. It increases the applicability of the overall system and the possibility of digital development. The screwdriver body is driven by a 40W servo motor, avoiding the problems of low reliability, high failure rate and short life of the brushed motor. Also, a reducer is added between the servo motor and the transmission part. The reduction gear can reduce the speed and multiply the torque. In order to avoid axial force on the reducer and servomotor from the backward impact force during tightening, a flat transmission pin and hexagonal blade sleeve are used. A deep groove ball bearing is arranged on the hexagonal blade sleeve, which means that the shaft only transmits torque. The axial impact force is transmitted to the deep groove ball bearing to prevent the damage caused by the axial impact force on the reducer/servomotor and prolong its service life.

character list

• 1 a block diagram of the hand-held electric screwdriver system of the invention,
• 2 a topological diagram of the hand-held electric screwdriver system of the invention,
• 3 an exploded view of embodiment 1 of the hand-held electric screwdriver system of the invention,
• 4 a partial sectional view of embodiment 1 of the hand-held electric screwdriver system of the invention,
• 5 an enlarged partial view of embodiment 1 of the hand-held electric screwdriver system of the invention,
• 6 12 is a partial view of embodiment 2 of the hand-held electric screwdriver system of the invention.

Description of the preferred embodiments

The present invention will be described in detail below in connection with the accompanying drawings and embodiments. Examples of these embodiments are shown in the drawings, wherein the same or similar reference numbers represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the figures are only intended to explain the present invention and should not be construed as limiting the present invention.

In the description of the present invention, it is understood that the terms represented by the terms "middle", "top", "bottom", "front", "back", "left", "right", "vertical", "horizontal" , "ceiling", "floor", "inside", "outside", etc., the orientations or positional relationships indicated are based on the orientations or positional relationships shown in the drawings and are for convenience in describing the present invention only, rather than indicating or implying that a device or element must have, be constructed and operate in a particular orientation. Therefore, this should not be construed as limiting the invention.

Embodiment 1: 1 and 2 Figure 12 shows a block diagram and topological diagram of the hand held electric screwdriver system of the invention. The system includes a screwdriver body, a servo driver, a power module and a microcontroller MCU. The power module includes a switching power and a drive power. The switching current is supplied to the microcontroller MCU. The drive current is supplied to the Servo Driver. The microcontroller MCU controls the servo driver. The servo driver drives the screwdriver body. A servo motor is arranged in the screwdriver body.

The microcontroller MCU has communication interfaces. The communication interfaces include rs232, rs485, rj45, IO input and IO output.

The hand-held screwdriver system still includes external devices that are connected via buses. The external devices contain a human-machine interface and a code reader. The external devices are connected to the microcontroller MCU via the RS232 and RS485 bus. The human-machine interface includes an LCD display, a touch screen, physical buttons and LED indicators.

The information exchange with the microcontroller MCU and the data display are realized by buses and communication interfaces.

After connecting with the code reader, the workpiece number read by the code reader is bound with specific information and saved.

The system still includes single-chip PLC and PC background. The single chip PLC is connected to the microcontroller MCU via the bus. The screw feeding system is controlled by the single chip PLC. The data is uploaded from the single chip PLC to the PC background. The PC background is connected to the cloud via Ethernet.

The PC background can be connected to the bulk system, cloud, etc. through the firewall.

The switching current contains three kinds of current DC12V, DC5V, DC3.3V Among them, 3.3V is used to power the microcontroller MCU. The man-machine interface is e.g. hand-held code reader, etc. It is connected to the screwdriver system through the RS232, RS485 bus to set and read the operating parameters. After connecting the code reader and the screwdriver system, the workpiece number is read by the code reader. The specific information is linked to the workpiece number and saved.

3 FIG. 13 shows an exploded view of the physical structure of the screwdriver body, which includes a housing 10, a servo motor 20, a planetary reduction gear 30, a transmission part, connecting elements and a front cap 60. FIG. The feature is that the planetary reduction gear 30 is added between the servo motor 20 and the transmission part. The planetary reduction gear 30 entrains the connecting elements through the transmission part. The transmission part is a flat transmission pin. The connecting elements contain a hexagonal blade sleeve 50, a grooved ball bearing 80 and a spacer ring 90.

The housing 10 and the front cap 60 are mounted on the outside. The housing 10 encloses important components such as the servo motor 20 and the planetary reduction gear 30. The front cap 60 is mainly put on the front of the hexagonal blade sleeve 50 and has a hole in the front for inserting the blade 70.

A different specification blade is brought to the fasteners to turn screws of different specifications and sizes. The servomotor 20 is coupled to the planetary reduction gear 30 through a pinion 31 . The transmission part is a flat transmission pin 40. The connecting elements include the hexagonal blade sleeve 50, etc. The shaft of the planetary reduction gear 30 is inserted into the hexagonal blade sleeve 50 through the flat transmission pin 40. The rear end of the hex blade sleeve 50 is assembled with the flat transfer pin. The front end is used to fix the blade. A bearing is provided around the hexagonal blade sleeve 50 . The shaft of the planetary reduction gear 30 is fastened in the flat transmission pin 40 by a set screw, whereby a screw connection between the shaft and the flat transmission pin 40 is realized.

A motor mount 21 is provided between the servo motor 20 and the planetary reduction gear 30 . The motor mount is attached to the servo motor with screws. Between the engine mount tion 21 and the planetary reduction gear, the pinion 31 is arranged.

The shaft of the planetary reduction gear 30 is directly inserted into the flat transmission pin 40. A reduction gear mounting ring 32 is arranged on the outside of the junction of the planetary reduction gear 30 and the flat transmission pin 40 . The reduction gear mounting ring 32 is fixed to the planetary reduction gear 30 by screws and abuts the case 10 with its end face. The flat transfer pin 40 is inserted directly into the flat hole at the back end of the hexagonal blade sleeve 50. The deep groove ball bearing 51 and the spacer ring 52 are placed around the hexagonal blade sleeve 50. The end face of the deep groove ball bearing 51 rests against the spacer ring 52 . The other end surface of the spacer ring 52 abuts the reduction gear mounting ring 32 .

The shaft of the planetary reduction gear 30 is directly inserted into the flat transmission pin 40. The flat transfer pin 40 is inserted into the flat hole at the rear end of the hex blade sleeve 50. Only the torque is transmitted from the hexagonal blade sleeve to the flat transmission pin 40 without absorbing the axial force. The axial impact force is absorbed by the deep groove ball bearing 51 on the hexagonal blade sleeve 50. The deep groove ball bearing 51 is in contact with the spacer ring 52 . The spacer ring 52 abuts the reducer mounting ring 32 to absorb the axial impact force. The power is transmitted to the case in stages, avoiding the problem that the impact force is transmitted to the internal power parts.

The reduction gear mounting ring 32 is provided with a recess on the side facing the spacer ring 52 in which a portion of the spacer ring is received to provide axial support. The end surface of the spacer ring facing the reduction gear may abut against the recess of the reduction gear mounting ring. The reduction gear mounting ring 32 partially encloses the spacer ring 52 and then is enveloped front to back by the toe cap. All internal components are covered.

The grooved ball bearing 51 and the hexagonal blade sleeve 50 are axially positioned and clamped by a snap ring 53 . In practice, the hexagonal blade sleeve 50 forms a step surface 55 for the deep groove ball bearing 51. The deep groove ball bearing is fitted to the hexagonal blade sleeve with the rear end surface of the deep groove ball bearing abutting the step surface and the front end surface being clamped by the snap ring 53.

The outer wall of the hexagonal blade sleeve 50 is provided with a snap ring groove 54 . A portion of the snap ring engages snap ring groove 54 . The other part rests against the front end of the deep groove ball bearing. When the hexagonal blade sleeve 50 is subjected to the backward impact force together with the blade, the spring ring 53 is pressed against the deep groove ball bearing 51 directly.

The outside of the hexagonal blade sleeve 50 is covered by the front cap 60. A demounting sleeve 80 is provided between the hexagonal blade sleeve 50 and the front cap 60 . The front end of the disassembling sleeve 80 is snapped into the compression spring 81 by the locking ring 82 and the earless locking ring 83 . A groove is formed between the inner wall of the disassembly sleeve 80 and the hexagonal blade sleeve 50 . The compression spring 81 engages in the groove.

A thread protection sleeve 90 is provided on the outside of the toe cap 60 .

An industrial connector 11 and a hook 12 are provided at the rear end of the housing, which is convenient for hand-held construction and connection of the hand-held screwdriver to the circuit.

A start switch 13 and a forward and reverse push button 14 are arranged on the housing. The start switch 13 is electrically connected to the start switch circuit board 15 . The forward and reverse push button 14 is electrically connected to the forward and reverse push button circuit board 16 .

Various types of blades 70 are provided for the body of the hand-held electric screwdriver and are used to drive screws of different types and sizes. The end of the blade 70 must be inserted into the hexagonal blade sleeve. The blade 70 has an arcuate recess. The blade sleeve is fitted with a steel ball. Because the steel ball engages in the arc-shaped groove, the blade is attached to the device. The blade sleeve has a regular hexagon socket hole and corresponds to the shape of the blade. Torque is transmitted through the regular hexagonal surface.

Embodiment 2: As in 4 As shown, the difference of this embodiment from embodiment 1 is that the transmission member is a long transmission pin 40' and the connector is a notched end blade sleeve 50'.

A notched end drive block is provided in the notched end blade sleeve 50'. The end of the blade is inserted into the blade sleeve to engage the drive block in the blade sleeve. The transmission part is the long transmission pin 40'. The pin sleeve 41' at the end of the long transmission pin 40' is coupled to the shaft. The pin 42' of the long transmission pin 40' drives the notched end blade sleeve 50'. Mounting hardware is provided on the notched end blade sleeve 50'. Mounting hardware includes deep groove ball bearing and spacer ring.

The notched end blade sleeve 50' has a front end and a rear end. The notched end drive block in the forward end includes a notched end pin 51' and a cylindrical pin 52'. The rear end is a specially shaped sleeve. The notched end blade sleeve 50' has a pin hole 53'. Cylindrical pin 52' passes through pin hole 53' and secures pin 51' with notched end 50' in blade sleeve 50' with notched end. The shape of the rear end inner hole corresponds to the shape of the pin 42' of the long transmission pin 40'. The pin of the long transfer pin is inserted into the inner hole at the back end of the blade sleeve.

The notched end pin 51' has a notch in the circumferential direction. The end of the blade forms a notch which mates with the notched end pin 51'. The two work together for the transmission.

The hand-held electric screwdriver system of the invention is equipped with a microcontroller. The microcontroller controls the servo driver. The servo driver drives the servo motor in the screwdriver body to perform tightening. Connected to the network through various data interfaces, the microcontroller stores, backups and transmits the settings and parameters of the attraction process, which can realize the intelligent and digital control operations such as remote management and data analysis. It increases the applicability of the overall system and the possibility of digital development. The screwdriver body is driven by a 40W servo motor, avoiding the problems of low reliability, high failure rate and short life of the brushed motor. Also, a reducer is added between the servo motor and the transmission part. The reduction gear can reduce the speed and multiply the torque. In order to avoid axial force on the reducer and servomotor from the backward impact force during tightening, a flat transmission pin and hexagonal blade sleeve are used. A deep groove ball bearing is arranged on the hexagonal blade sleeve, which means that the shaft only transmits torque. The axial impact force is transmitted to the deep groove ball bearing to prevent the damage caused by the axial impact force on the reducer/servomotor and prolong its service life.

The above description represents only preferred embodiments of the present invention and should not limit the present invention thereto. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can use the technical content disclosed above to make some equivalent changes and modifications without departing from the scope of the technical solution of the present invention. As long as it does not deviate from the content of the technical solution of the present invention, the technology of the present invention relates to any equivalent changes and modifications of the embodiments of the invention, all of which fall within the scope of the technical solution of the present invention.

Reference List

10

Housing,

11

industrial connectors,

12

Hook,

13

start switch,

14

forward and reverse push button,

15

start switch circuit board,

16

Forward and reverse push button circuit board,

20

servo motor,

21

engine mount,

30

planetary reduction gear,

31

Pinion,

32

reducer mounting ring,

40

flat transfer pin,

50

hexagonal blade sleeve,

51

deep groove ball bearing,

52

spacer ring,

53

snap ring,

54

snap ring groove,

55

step surface,

60

toe cap,

70

Blade,

80

dismantling sleeve,

81

compression spring,

82

locking ring,

83

earless lock ring,

90

thread protection sleeve

40'

long transfer pin,

41'

pen sleeve,

42'

Pen,

50'

blade sleeve with notched end,

51'

pen with notched end,

52'

cylindrical pen,

53'

pin hole

Claims (10)

Hand-held electric screwdriver system comprising a screwdriver body, a servo driver, a power module and a microcontroller MCU, the power module including a switching power and a drive power, the switching power being supplied to the microcontroller MCU, the drive power being supplied to the servo driver, the Microcontroller MCU controls the servo driver, wherein the servo driver drives the screwdriver body, and wherein a servo motor is arranged in the screwdriver body. Hand-held electric screwdriver system claim 1 , characterized in that the microcontroller MCU has communication interfaces, the communication interfaces including rs232, rs485, rj45, IO input and IO output; that the hand-held screwdriver system still includes external devices that are connected via the buses, the external devices containing a man-machine interface and a code reader, the external devices being connected to the microcontroller MCU via RS232 and RS485 bus , wherein the man-machine interface includes an LCD display, a touch screen, physical buttons and LED displays, the information exchange with the microcontroller MCU and the data display being realized through buses and communication interfaces; and that the system still includes single-chip PLC and PC background, the single-chip PLC is connected to the microcontroller MCU via the bus, the screw feeding system is controlled by the single-chip PLC, the data from the single-chip PLC can be uploaded to the PC background, and the PC background is connected to the cloud via Ethernet. Hand-held electric screwdriver system claim 2 , characterized in that the switching current contains three kinds of current DC12V, DC5V, DC3.3V, where 3.3V is used to power the microcontroller MCU, the man-machine interface and hand-held code reader through the RS232, RS485 bus connected to the screwdriver system to set and read the operating parameters, and after connecting the code reader and the screwdriver system, the workpiece number is read from the code reader, and the specific information is bound with the workpiece number and saved. Hand-held electric screwdriver system claim 1 , characterized in that the screwdriver body has a housing (10), a servo motor (20), a planetary reduction gear (30), a transmission part, connecting elements and a front cap (60), characterized in that the planetary reduction gear (30) between the servo motor ( 20) and added to the transmission part, with the planetary reduction gear (30) carrying the links through the transmission part, with the housing (10) and the toe cap (60) mounted on the outside, with a different specification blade being brought to the links ; and that the servomotor (20) is coupled to the planetary reduction gear (30) through a pinion (31), the transmission part being a transmission pin and the connecting element being a blade sleeve, the shaft of the planetary reduction gear (30) being inserted into the blade sleeve (50 ) is used, with the rear end of the blade sleeve being assembled with the transmission pin and the front end serving to fix the blade, and a bearing being provided around the blade sleeve. Hand-held electric screwdriver system claim 4 characterized in that the transmission part and the connecting element are a flat transmission pin (40) and a hexagonal blade sleeve (50) or the transmission part and the connecting element are a long transmission pin (40') and a notched end blade sleeve (50'). Hand-held electric screwdriver system claim 5 , characterized in that when the transmission part and the connecting element are a flat transmission pin (40) and a hexagonal blade sleeve (50), the Shaft of the planetary reduction gear (30) is inserted into the hexagonal blade sleeve (50) through the flat transmission pin (40), the rear end of the hexagonal blade sleeve (50) is assembled with the flat transmission pin, and the front end is for fixing the blade . Hand-held electric screwdriver system claim 5 , characterized in that when the transmission part and the connecting element are a long transmission pin (40') and a notched-end blade sleeve (50'), the shaft of the planetary reduction gear (30) is inserted through the long transmission pin (40) into the blade sleeve (50 ') with a notched end, with the pin of the long transmission pin being inserted into the rear end of the blade sleeve, with a notched end drive block being provided in the blade sleeve (50') with a notched end, and with the end of the blade inserted in the Blade sleeve is used to cooperate with the drive block in the blade sleeve. Hand-held electric screwdriver system claim 4 , characterized in that a motor mount (21) is provided between the servomotor (20) and the planetary reduction gear (30), the pinion (31) being arranged between the motor mount (21) and the planetary reduction gear, the shaft of the planetary reduction gear (30 ) is directly inserted into the flat transmission pin (40), with a reducer mounting ring (32) arranged on the outside of the junction of the planetary reduction gear (30) and the flat transmission pin (40), the reducer mounting ring (32) being screwed fixed to the planetary reduction gear (30) and having its end face abutted against the housing (10), the flat transmission pin (40) is directly inserted into the flat hole at the rear end of the hexagonal blade sleeve (50), the deep groove ball bearing (51) and the spacer ring (52) are placed around the hex blade sleeve (50) with the end face of the deep groove ball bearing (51) at the dista and the other end face of the spacer ring (52) abuts the reducer mounting ring (32). Hand-held electric screwdriver system claim 8 , characterized in that the reduction gear mounting ring (32) is provided on the side facing the spacer ring (52) with a recess in which a part of the spacer ring is received. Hand-held electric screwdriver system claim 9 , characterized in that the deep groove ball bearing (51) and the hexagonal blade sleeve (50) are axially positioned and clamped by a snap ring (53), the outer wall of the hexagonal blade sleeve (50) being provided with a snap ring groove (54), with a part of the snap ring engages in the snap ring groove (54) and the other part rests against the front end of the deep groove ball bearing, the outside of the hexagonal blade sleeve (50) being covered by the front cap (60), with the hexagonal blade sleeve (50) and the front cap ( 60) a disassembly sleeve (80) is provided, the front end of the disassembly sleeve (80) being snapped in by the locking ring (82) in the compression spring (81), wherein between the inner wall of the disassembly sleeve (80) and the hexagonal blade sleeve (50) a groove is formed, with the compression spring (81) engaging in the groove, and a thread protection sleeve (90) being provided on the outside of the front cap (60).

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