TW202247952A - Power tool and torque display device thereof - Google Patents

Abstract

A power tool and torque display device thereof are disclosed. The power tool includes a housing and a control board, a power unit, a bearing set, a transmission mechanism and a torsion shaft disposed in the housing. The power device is arranged in the housing through the bearing set and transmits torque through the transmission mechanism. The torsion shaft is connected to the rear side of the power unit and rotates with the power unit. Moreover, the power tool can be provided with a torque sensor on the rear side of the power unit for sensing the torque of the power tool.

Description

Power tool machine and its torque display setting

The invention relates to a power tool, especially a power tool machine and its torque display device.

Traditional power tools, such as electric screwdrivers and pneumatic wrenches, etc., its main structure includes a housing, a power device (such as a battery or high-pressure air), a transmission mechanism, and control components, etc., wherein the power device is fixed in the housing and its shaft is connected to the transmission mechanism, and the control elements are electrically connected to the power unit. Accordingly, the operation of the power device is controlled through the control element to drive the transmission mechanism and the tool head mounted on the transmission mechanism, thereby providing sufficient torque to rotate the tool head.

However, most of the existing power tools have variable torque, and the power device often continues to rotate after exceeding the predetermined torque, resulting in damage to the power device and other components and shortening the service life, so it needs to be improved.

Furthermore, the existing power tools are equipped with torque sensors to detect the torque, and when the predetermined torque is reached, a signal is transmitted to the control element, so as to control the power device to stop running. In addition, the torque sensor of a general power tool is installed on the transmission mechanism, and the torque sensor will be in a rotating state for a long time with the operation of the transmission mechanism, resulting in broken wires, poor contact and other problems that affect the electrical connection. cause damage to the power tool. In addition, when the power tool is in operation, the transmission mechanism connected to the tool head will vibrate or deform, which will affect the torque value detected by the torque sensor and reduce the accuracy of the torque sensor.

In view of this, the inventor of the present invention aimed at the above-mentioned prior art, devoted himself to research and combined with the application of theories, and tried his best to solve the above-mentioned problems, which became the goal of the inventor's improvement.

One object of the present invention is to provide a power tool, the power body of which can rotate relative to the casing through the arrangement of the bearing group, so that it will be in a reverse state after exceeding a predetermined torque, and the torque sensor will transmit a signal to The control board is used to immediately stop the operation of the power body, so that the power device will not be damaged or the service life will be reduced.

In order to achieve the above object, the present invention is a power tool. The casing contains the accommodating space and the working end located in front of the accommodating space, and the working end has an opening. The control panel is arranged in the accommodation space. The power device is arranged in the accommodating space, and the power device includes a power body electrically connected to the control board, a drive shaft driven by the power body, and a sheath covering the power body. The bearing set is arranged between the sheath and the casing so that the power body can rotate relative to the casing. The transmission mechanism is arranged in the accommodating space and is located on the front side of the power device. The transmission mechanism includes a gearbox connected to the drive shaft and an actuating part protruding from the gearbox. The tool piece rotates. The torsion shaft is arranged in the accommodating space and is located at the rear side of the power device relative to the transmission mechanism. The torsion shaft is connected to the power device and rotates with the power device.

One object of the present invention is to provide a torque display device for a power tool. The torque sensor is arranged on the rear side of the power body, so that the torque sensing will not be affected by the vibration of external tool parts, so as to provide accurate torque values. .

In order to achieve the above purpose, the present invention is a torque display device for a power tool, including a power tool and a torque sensor. The torque sensor is arranged in the casing and located at the rear side of the power device.

Compared with the conventional ones, the power tool machine of the present invention is provided with a bearing set between the power body and the casing to provide that the power body can rotate relative to the casing and be in a reverse state after exceeding a predetermined torque. At this time, the torque The sensor will send a signal to the control board to immediately stop the operation of the power body, causing damage to the power device or reducing the service life. Moreover, the present invention also provides a torque display device for a power tool. The torque sensor is arranged on the rear side of the power body, so that the torque sensor will not be affected by the vibration or deformation of the external tool parts and affect the torque sensing. Provides accurate torque values. In addition, arranging the torque sensor at the rear end of the housing of the power tool can reduce the space at the front end of the housing and avoid affecting the power output, so that the power can be more directly transmitted to the working end, increasing the practicality of use.

The detailed description and technical content of the present invention are described below with the drawings, but the attached drawings are only for reference and description, and are not used to limit the present invention.

Please refer to FIG. 1 , which is a schematic cross-sectional view of a power tool and its torque display device of the present invention. The power tool machine 1 of the present invention comprises a housing 10 and a control board 20 , a power device 30 , a bearing set 40 , a transmission mechanism 50 and a torsion shaft 60 arranged in the housing 10 . The power device 30 is disposed in the housing 10 through the bearing set 40 , and transmits torque to a tool (not shown) through the transmission mechanism 50 . The torsion shaft 60 is connected to the rear side of the power device 30 and rotates with the power device 30 to constitute the power tool 1 . A more detailed description of the structure of the power tool 1 is as follows.

The casing 10 includes an accommodating space 100 and a working end 101 located in front of the accommodating space 100 , and the working end 101 has an opening 102 communicating with the outside. The control board 20 is electrically connected to the power device 30 to control the operation of the power tool 1 .

The power device 30 is disposed in the accommodating space 100 . The power device 30 includes a power body 31 electrically connected to the control board 20 , a drive shaft 32 driven by the power body 31 , a sheath 33 covering the power body 31 and a drive shaft 32 combined. Drive gear 321. The driving gear 321 is connected to the transmission mechanism 50 .

In this embodiment, the power body 31 is an electric motor, which uses a battery as a power source, and uses the electric motor to drive the drive shaft 32 to rotate. However, in practice, the power body 31 can also be set as an air motor, which uses compressed air as a power source to drive the drive shaft 32 to rotate with high-pressure gas.

Moreover, the bearing set 40 is disposed between the sheath 33 and the housing 10 so that the power body 31 (together with the sheath 33 ) can rotate relative to the housing 10 .

Furthermore, the transmission mechanism 50 is disposed in the accommodating space 100 and located at the front side of the power device 30 . The transmission mechanism 50 includes an actuating portion 52 . The actuating part 52 drives a tool part (not shown) to rotate as the gearbox 51 rotates and protrudes out of the opening 102 of the casing. In addition, the torsion shaft 60 is disposed in the accommodating space 100 and is located at the rear side of the power device 30 relative to the transmission mechanism 50 . Moreover, the torsion shaft 60 is connected to the power device 30 and rotates with the power device 30 .

In this embodiment, the power body 31 is an electric motor; furthermore, the transmission mechanism 50 includes a gearbox 51 connected to the drive shaft 32, and the actuating part 52 is connected to the gearbox 51 for rotational output.

Furthermore, the housing 10 includes a body portion 11 and a handle portion 12 connected to the body portion 11 . The power device 30 and the transmission mechanism 50 are disposed on the main body 11 . The handle portion 12 is provided with a button 121 exposed from the casing. In addition, in this embodiment, the power tool 1 further includes a battery 80 . The battery 80 is disposed on the handle portion 12 and electrically connected to the control board 20 to provide the power required for the operation of the power tool 1 .

It should be noted that, in practical implementation, the torsion shaft 60 can also be disposed on the rear side of the power device 30 , for example, at the rear end of the power body 31 and adjacent to the side of the battery 80 or the button 121 .

Moreover, the present invention further provides a torque display device for a power tool, which includes the aforementioned power tool 1 and a torque sensor 2 . The torque sensor 2 can be configured as a strain gauge, which is disposed in the accommodating space 100 and located at the rear side of the power device 30 . In this embodiment, the torque sensor 2 is disposed on the torsion shaft 60 for sensing the torsion of the power tool 1 . In actual implementation, the torque sensor 2 can also be arranged at the sleeve 342 or the rear bearing 70 described later.

It should be noted that the power tool 1 of the present invention further includes a display 3 . The display 3 is exposed from the housing 10 and electrically connected to the control board 20 for displaying the torque value of the power tool 1 .

Please also refer to FIG. 2 to FIG. 4 , which are respectively a three-dimensional appearance schematic diagram of the transmission part of the present invention and a three-dimensional exploded schematic diagram of two side directions. As shown in the figure, in one embodiment of the present invention, the power device 30 further includes a linkage cover 34 located between the sheath 33 and the torsion shaft 60, that is, the two sides of the linkage cover 34 are respectively connected The sheath 33 and the torsion shaft 61 .

As shown in Figure 3 and Figure 4. In more detail, the sheath 33 has a front side 331 and a rear side 332 opposite to each other. The front side 331 is formed with a plurality of first detents 3311 , and the rear side 332 is formed with a plurality of second detents 3321 . The linkage cover 34 is formed with a plurality of third pawls 340 on the side facing the sheath 33 butted against the second pawls 3311 . In addition, the linkage cover 34 includes a cover 341 and a sleeve 342 connected to the cover 341 . The cover 341 fits a rear side of the power body 31 and is formed with the third pawls 340 . The sleeve 342 fits on the front end of the torsion shaft 60 . In this embodiment, the sleeve 342 is formed with a hexagonal hole 3420 (see FIG. 4 ), and the front end of the torsion shaft 60 is formed with a hexagonal column 61, and the torsion shaft 60 is combined through the hexagonal column 61 through the hexagonal hole 3420. In this sleeve 342 .

In this embodiment, the power tool 1 further includes a rear seat 70 . The rear bearing seat 70 is fixed in the casing 10 (see FIG. 1 ) and receives a rear end of the torsion shaft 60 . Specifically, two protruding rings 62 arranged at intervals are formed on the outer surface of the torsion shaft 60 . The two protruding rings 62 abut against the sleeve 342 and the rear seat 70 respectively. Accordingly, the torsion shaft 60 is supported between the linkage cover 34 and the rear bearing 70 .

Furthermore, in an embodiment of the present invention, the transmission mechanism 50 further includes a connecting ring 53 . The connecting ring 53 is formed with a plurality of protrusions 531 arranged at intervals, and the protrusions 531 engage the first pawls 331 .

It should be noted that the bearing assembly 40 disposed between the sheath 33 and the casing 10 includes a front bearing 41 and a rear bearing 42 arranged at intervals. A first ring rib 333 is formed on the outer peripheral surface of the sheath 33 . The front bearing 42 and the rear bearing 42 respectively abut against two sides of the first annular rib 333 and form an annular groove 330 (see also FIG. 2 ). In addition, a second annular rib 13 is formed on the inner wall of the casing 10 (see also FIG. 1 ). The sheath 33 is positioned in the housing 10 through the second rib 13 abutting against the first rib 333 .

Accordingly, the user presses the button 121 to activate the control panel 20 to start operation. The control panel 20 enables the power body 31 to start running. Moreover, the power body 31 drives the transmission mechanism 50 to rotate through the drive shaft 32. After the power body 31 reaches a predetermined torque, the actuating part 52 of the transmission mechanism 50 can drive the external tool to rotate. Subsequently, after the predetermined torque is exceeded, the power body 31 rotates relative to the casing 10 through the arrangement of the bearing set 40 . At this time, the interlocking cover 34 and the torsion shaft 60 will rotate together with the power body 31 . In addition, the torque sensor 2 disposed on the rear side of the power body 31 can sense the received torque, and the torque signal will be transmitted through the control board 20 and displayed on the display 3 .

It should be noted that the power body 31 of the present invention will be in a reverse state after exceeding a predetermined torque, and transmit the torque to the torque shaft 60. At this time, the torque sensor 2 will transmit a signal to the control board to Immediately stop the operation of the power body 31 . Furthermore, since the torque sensor 2 of the present invention is arranged on the rear side of the power body 31, it will not be affected by the vibration of the external tool parts to affect the torque sensing, and provide accurate torque values. In addition, disposing the torque sensor 2 at the rear end of the housing 10 of the power tool 1 can further reduce the space at the front end of the housing 10 , avoid affecting the power output, and allow the power to be more directly transmitted to the working end 101 .

The above descriptions are only preferred embodiments of the present invention, and are not used to define the patent scope of the present invention. Other equivalent changes using the patent spirit of the present invention should all belong to the patent scope of the present invention.

1: Power tool machine

2: Torque sensor

3: Display

10: Shell

100:Accommodating space

101: Working end

102: opening

11: Main body

12: Handle

121: button

13: Second ring rib

20: Control panel

30: power unit

31: Power body

32: drive shaft

321: Driving gear

33: Sheath

330: ring ditch

331: front side

3311: first pawl

332: Rear side

3321: Second pawl

333: The first ring rib

34: Interlocking cover

340: The third pawl

341: cover

342: Sleeve

3420: Hexagonal hole

40: Bearing set

41:Front bearing

42: rear bearing

50: transmission mechanism

51: gearbox

52: Action department

53: Connecting ring

531: Bump

60: torsion shaft

61: Hexagonal column

62: convex ring

70: Rear seat

80: battery

Fig. 1 is a schematic cross-sectional view of a power tool and its torque display device of the present invention.

Fig. 2 is a three-dimensional appearance schematic diagram of the transmission part of the present invention.

Fig. 3 and Fig. 4 are three-dimensional exploded schematic diagrams of two sides of the transmission part of the present invention.

1: Power tool machine

2: Torque sensor

3: Display

10: Shell

100:Accommodating space

101: Working end

102: opening

11: Main body

12: Handle

121: button

13: Second ring rib

20: Control panel

30: power unit

31: Power body

32: drive shaft

321: Driving gear

33: sheath

333: The first ring rib

34: Interlocking cover

342: Sleeve

40: Bearing set

50: transmission mechanism

51: gearbox

52: Action department

53: Connecting ring

60: torsion shaft

62: convex ring

70: Rear seat

80: battery

Claims (10)

A power tool machine, comprising: A casing, including an accommodating space and a working end located in front of the accommodating space, the working end has an opening; a control panel, arranged in the accommodating space; A power device, arranged in the accommodating space, the power device includes a power body electrically connected to the control board, a drive shaft driven by the power body, and a sheath covering the power body; A bearing set is arranged between the sheath and the casing so that the power body can rotate relative to the casing; A transmission mechanism is arranged in the accommodating space and is located on the front side of the power device, the transmission mechanism includes an actuating part, and the actuating part drives a tool to rotate as the drive shaft rotates and protrudes out of the opening of the housing ;as well as A torsion shaft is arranged in the accommodating space and is located at the rear side of the power device relative to the transmission mechanism. The torsion shaft is connected to the power device and rotates with the power device. The power tool according to claim 1, wherein the power device further includes a linkage cover located between the sheath and the torsion shaft, and the two sides of the linkage cover are respectively connected to the sheath and the torsion shaft. The power tool machine as described in claim 2, wherein the sheath has an opposite front side and a rear side, the front side is formed with a plurality of first pawls, and the rear side is formed with a plurality of second pawls, the linkage cover is A plurality of third ratchets butted against the second ratchets are formed on the side facing the sheath. The power tool as claimed in claim 3, wherein the interlocking cover includes a cover and a sleeve connected to the cover, and the cover covers a rear side of the power body and is formed with the third pawls , the sleeve fits a front end of the torsion shaft. The power tool machine as claimed in claim 3, further comprising a rear bearing, which is fixed in the casing and receives a rear end of the torsion shaft. The power tool according to claim 5, wherein the outer surface of the torsion shaft is formed with two protruding rings arranged at intervals, and the two protruding rings abut against the sleeve and the rear bearing respectively. The power tool according to claim 3, wherein the transmission mechanism further includes a connecting ring, and the connecting ring is formed with a plurality of protrusions arranged at intervals, and the protrusions are used to engage the first pawls. The power tool machine as described in claim 1, wherein the bearing set includes a front bearing and a rear bearing arranged at intervals, a first ring rib is formed on the outer peripheral surface of the sheath, and the front bearing and the rear bearing are respectively A ring groove is formed on two sides of the first ring rib; a second ring rib is formed on the inner wall of the casing, and the sheath is positioned on the first ring rib through the second ring rib abutting against the first ring rib. inside the shell. A torque display device for a power tool, comprising a power tool according to any one of claims 1 to 8 and a torque sensor, the torque sensor is arranged in the housing and located at the power device rear side. The torque display device of a power tool according to claim 9, wherein the torque sensor is arranged on the torque shaft.

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