JP2024039000A - Torque detector for power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a torque detector for a power tool.

SOLUTION: A torque detector for a power tool (1) of the present invention includes a housing (10), a power device (20), a bearing set (30), a torque lever (40), and a torque sensor (50). The housing (10) includes a main body (11) and a handle (12) connected perpendicular to one side of the main body (11). The power device (20) is installed inside the main body (11), and includes a power main body (21) and a protective cover (22) fitted to the power main body (21). The bearing set (30) is installed between the protective cover (22) and the housing (10) to allow the power main body (21) to rotate with respect to the housing (10). The torque lever (40) is installed inside the handle (12) and in contact with the protective cover (22), and the torque lever (40) and the power main body (21) are installed to form a perpendicular angle. The torque sensor (50) is installed on the torque lever (40) to improve convenience during assembly and provide an accurate torque value.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to power tools, and specifically refers to a torque sensing device for power tools.

Currently, a power tool equipped with a torque sensor can be used to detect torque, and when a predetermined torque is reached, a signal is transmitted to control the operation of the power device to be stopped.

In addition, since the torque sensor of general power tools is usually installed on the transmission mechanism, the torque sensor is kept in a rotating state for a long time as the transmission mechanism operates, resulting in breakage of electric wires, poor contact, etc. This can cause problems and affect electrical connections, resulting in damage to the power tool. In addition, when a power tool operates, conditions such as vibration or deformation occur in the transmission mechanism that connects the tool head, which further affects the torque value detected by the installed torque sensor, reducing the accuracy of the torque sensor. do.

In view of this, the present inventor has conducted deep research into the above-mentioned conventional technology, and has also applied academic theory to make efforts to solve the above-mentioned problems, thereby achieving the inventor's goal of improvement. reached.

One object of the present invention is that since the torque lever is installed inside the handle and perpendicular to the power main body, torque detection is not affected by vibrations of the power main body. The first object is to provide a torque display device for a power tool that provides accurate torque values.

One object of the present invention is that a torque lever and a torque sensor are installed in the handle of the housing, and the torque sensor is prevented from rotating with the power unit, thereby preventing problems such as breakage of electric wires and poor contact. It is an object of the present invention to provide a torque display device for a power tool, which improves convenience during assembly because the problem is avoided.

To achieve the above object, a torque display device for a power tool according to the present invention includes a housing, a power device, a bearing set, a torque lever, and a torque sensor. The housing includes a main body and a handle vertically connected to one side of the main body, the power device is installed within the main body, and includes a power main body and a protective cover mating to the power main body, and the bearing set is connected to the protective cover. By being installed between the power body and the housing, the power body can rotate with respect to the housing, and the torque lever is installed in the handle and comes into contact with the protective cover, and the torque lever is perpendicular to the power body. The torque sensor is installed on the torque lever.

Compared to the known technology, the power tool of the present invention has a torque lever and a torque sensor installed in the handle of the housing, which prevents the torque sensor from rotating with the power device, which prevents breakage of electric wires and poor contact. Since problems such as these are avoided, convenience during assembly is improved. Furthermore, in the present invention, the torque sensor is installed on the torque lever on one side perpendicular to the power main body, and the torque sensor is installed on the torque lever on one side perpendicular to the power main body, Since the sensor is prevented from being subjected to vibrations or deformation of external tool members that affect the torque detection, an accurate torque value is provided and the practicality of use is improved.

1 is a schematic three-dimensional external view of a power tool according to the present invention. 1 is a schematic three-dimensional external view of a torque detection device according to the present invention. 1 is a schematic exploded three-dimensional diagram of a torque sensing device according to the present invention. FIG. 2 is a combined cross-sectional view of the power tool in both directions of the present invention. FIG. 2 is a combined cross-sectional view of the power tool in both directions of the present invention. FIG. 3 is an application schematic diagram of the power tool in the present invention.

The detailed description and technical content of the present invention will be explained below based on the drawings, but the attached drawings are provided for reference and explanation only and are not intended to limit the present invention.

1 to 3 are a three-dimensional external schematic diagram of a power tool, a three-dimensional external schematic diagram of a torque sensing device, and a three-dimensional exploded schematic diagram of a torque sensing device according to the present invention, respectively. The present invention is a torque detection device for a power tool. The power tool 1 includes a housing 10, a power device 20, a bearing set 30, a torque lever 40, and a torque sensor 50. The power plant 20 is mounted within the housing 10. The bearing set 30 is installed between the power plant 20 and the housing 10. The torque lever 40 is connected to the torque sensor 50 and is installed perpendicular to the power plant 20 . Further, the power tool 1 can measure a torque value via the torque sensor 50 and control the operation of the power plant 20 accordingly. Below, the structure of the power tool 1 and its torque sensing device will be described in more detail.

The housing 10 includes a body 11 and a handle 12 vertically connected to one side of the body 11. In this embodiment, the housing 10 is installed in a T-shape.

The power plant 20 is installed within the main body 10. The power plant 20 includes a power main body 21 and a protective cover 22 that fits into the power main body 21. A drive shaft 211 is installed in the power main body 21 .

In this embodiment, the power main body 21 is an electric motor that uses a battery as a power supply source and drives the drive shaft 211 to rotate. However, in actual implementation, the power main body 21 may be installed as an air motor that uses compressed air as a power supply source and drives the drive shaft 211 to rotate.

The bearing set 30 is installed between the protective cover 22 and the housing 10, so that the power main body 21 (together with the protective cover 22) can rotate relative to the housing 10.

Furthermore, an outer annular rib 220 is formed on the outer surface of the protective cover 22 . In addition, the protective cover 22 has a protective cover front side 221 and a protective cover rear side 222 that face each other. A plurality of front ratchet pawls 2211 are installed at the edge of the front side 221 of the protective cover. A plurality of rear ratchet pawls 2221 are installed at the edge of the rear side 222 of the protective cover.

In one embodiment of the invention, the power plant 20 further includes a pair of motor fixing pieces 23 . The pair of motor fixing pieces 23 includes a front fixing piece 231 and a rear fixing piece 232 installed on opposite sides of the protective cover 22 . A plurality of front convex pieces 2311 are installed at intervals around the periphery of the front fixing piece 231. A plurality of rear convex pieces 2321 are installed at intervals around the periphery of the rear fixing piece 232.

In addition, the power plant 20 further includes a plurality of locking members 24. A plurality of first lock holes 2310 are installed in the front fixing piece 231, and a plurality of second lock holes 210 are correspondingly installed in the power main body 21. The front fixing piece 231 is fixed on the power main body 21 by passing through the first lock hole 2310 and the second lock hole 210 through the lock material 24. .

Specifically, the front fixing piece 231 engages with the front ratchet pawl 2211 of the protective cover 22 via the front convex pieces 2311, and is positioned at one end of the front side 221 of the protective cover. Ru. Further, the rear fixing piece 232 engages with the rear ratchet pawl 2221 of the protective cover 22 via the rear convex pieces 2321, and is positioned at one end of the rear side 222 of the protective cover.

Further, the bearing set 30 includes a front bearing 31 and a rear bearing 32 installed on both sides of the outer annular rib 220. Further, the torque lever 40 is installed within the handle 12, abuts the protective cover 22, and is installed such that the torque lever 40 and the power main body 21 are perpendicular to each other.

In addition, the torque sensor 50 can be installed as a strain gauge installed on the torque lever 40. The main principle of the torque sensor 50 (strain gauge) is that when the torque lever 40 is bent (deformed), a change in electrical resistance occurs. This change in electrical resistance generates a signal and, after calculation, a corresponding torque value.

More specifically, the torque lever 40 includes a base column 41 and a platform 42 connected to the base column 41. The torque sensor 50 is installed on the side of the platform 42. In this embodiment, the platform 42 has an abutment surface 421 . The platform 42 abuts the outer annular rib 220 of the protective cover 22 via an abutment surface 421 . Additionally, an outer annular plane 2201 is installed corresponding to the outer annular rib 220 . In other words, the contact surface 421 of the torque lever 40 is stuck onto the outer annular plane 2201 of the protective cover 22 .

What should be explained here is that in this embodiment, the torque lever 40 is firmly connected to the protective cover 22 via the outer annular rib 220. By installing the outer annular rib 220, the structural strength of the protective cover 22 can be increased to prevent the protective cover 22 from being deformed under rotational pressure, and the torque sensor 50 on the torque lever 40 can be prevented from deforming. It is ensured that the sensor can receive a reliable amount of deformation and generate a signal.

Further reference is made to FIGS. 4 and 5, which are combined cross-sectional side views of the power tool of the present invention. As illustrated, the power plant 20 of the present invention is installed within the main body 11 . The bearing set 30 is installed between the protective cover 22 and the housing 10. The pair of motor fixing pieces 23 are installed on opposite sides of the power main body 21 . In addition, the torque lever 40 is installed within the handle 12 and abuts the protective cover 22, and the torque sensor 50 is fixed on the platform 42 of the torque lever 40.

What should be explained here is that the interior of the handle 12 includes a positioning space 121 and an electrical space 122 that communicate with each other. Further, the base column 41 of the torque lever 40 is locked within the positioning space 121. The platform 42 of the torque lever 40 is installed through the electrical space 122, and a mounting gap 122' is reserved.

Continuing to refer to FIG. 6, it is a schematic diagram of the power tool application of the present invention. The power tool 1 of the present invention further includes a transmission 60. The transmission 60 is connected to the drive shaft 211 of the power main body 21 and provides the necessary rotational output. Furthermore, the power tool 1 further includes a battery 70 and a control board 80. The battery 70 and the control board 80 are installed within the attachment gap 122', and the control board 80 electrically connects the power main body 21 and the torque sensor 50.

In the above, when the power main body 21 is actuated (operated) and receives a blocking force from the outside, a reversing force is generated in the power main body 21. The power main body 21 transmits the reversing force to the protective cover 22 and rotates the protective cover 22. Further, when the protective cover 22 is rotated, the torque lever 40 is driven, and the torque lever 40 is deformed. Thereby, the torque sensor 50 on the torque lever 40 receives the amount of deformation and generates a signal.

At this time, the torque sensor 50 transmits a signal to the control board 80 to immediately stop the operation of the power main body 21. Furthermore, when the power tool 1 is operated, the power body 21 is probably subjected to vibrations of external tool members under power transmission, which affects the torque value. Further, the torque sensor 50 of the present invention is installed on the torque lever 40 on one side perpendicular to the power main body 21. Since the torque lever 40 is not a power transmission element, it is not affected by vibrations of the power body 21, and the torque sensor 50 can perform torque detection and provide an accurate torque value.

The above description is only a preferred embodiment of the present invention, and does not define the scope of the claims of the present invention, and any other equivalent changes that apply the patented concept of the present invention are within the scope of the claims of the present invention. shall belong to.

1 Power tool 10 Housing 11 Main body 12 Handle 121 Positioning space 122 Electrical space 122' Mounting gap 20 Power device 21 Power main body 210 Second lock hole 211 Drive shaft 22 Protective cover 220 Outer annular rib 2201 Outer annular plane 221 Protective cover front side 2211 Front Ratchet pawl 222 Rear side of protective cover 2221 Rear ratchet pawl 23 Motor fixing piece 231 Front fixing piece 2310 First lock hole 2311 Front convex piece 232 Rear fixing piece 2321 Rear convex piece 24 Lock material 30 Bearing set 31 Front bearing 32 Rear bearing 40 Torque Lever 41 Base column 42 Platform 421 Contact surface 50 Torque sensor 60 Transmission 70 Battery 80 Control board

Claims (10)

a housing (10) comprising a body (11) and a handle (12) connected vertically to one side of the body (11);
a power device (20) installed in the main body (11) and including a power main body (21) and a protective cover (22) fitted to the power main body (21);
a bearing set (30) that is installed between the protective cover (22) and the housing (10) so that the power main body (21) can rotate relative to the housing (10);
a torque lever (40) installed within the handle (12), abutting the protective cover (22), and perpendicular to the power main body (21);
A torque sensing device for a power tool, including a torque sensor (50) installed on the torque lever (40). An outer annular rib (220) is formed on the outer surface of the protective cover (22), and the bearing set (30) includes a front bearing (31) and a rear bearing (31) installed on both sides of the outer annular rib (220). 32) The torque sensing device for a power tool according to claim 1. The protective cover (22) has a protective cover front side (221) and a protective cover rear side (222) facing each other, and a plurality of front ratchet claws (2211) are installed at the edge of the protective cover front side (221). The torque sensing device for a power tool according to claim 1, wherein a plurality of rear ratchet pawls (2221) are installed at an edge of the rear side (222) of the protective cover. The power device (20) further includes a pair of motor fixing pieces (23), and the pair of motor fixing pieces (23) are connected to the front fixing pieces (231) installed on opposite sides of the protective cover (22). ) and a rear fixing piece (232), a plurality of front convex pieces (2311) are installed at intervals around the periphery of the front fixing piece (231), and a plurality of front convex pieces (2311) are installed at intervals around the periphery of the rear fixing piece (232). The torque detection device for a power tool according to claim 3, wherein a plurality of rear convex pieces (2321) are installed. The front fixing piece (231) is positioned at one end of the front side (221) of the protective cover by mutually engaging with the front ratchet pawl (2211) via the front convex piece (2311), and is positioned at one end of the front side (221) of the protective cover. The rear fixing piece (232) is positioned at one end of the rear side (222) of the protective cover by mutually engaging with the rear ratchet pawl (2221) via the rear convex piece (2321). The torque detection device for a power tool according to claim 4. The power device (20) further includes a plurality of locking members (24), a plurality of first locking holes (2310) are installed in the front fixing piece (231), and a plurality of first locking holes (2310) are installed in the power main body (21). Two lock holes (210) are installed, and the front fixing piece (231) penetrates into the first lock hole (2310) and the second lock hole (210) through the lock material (24). The torque sensing device for a power tool according to claim 4, wherein the torque sensing device for a power tool is fixed on the power main body (21) by being installed therein. The torque lever (40) includes a base column (41) and a platform (42) connected to the base column (41), and the torque sensor (50) is installed on the side of the platform (42). The torque detection device for a power tool according to claim 2. An abutting surface (421) is installed on the platform (42), and the platform (42) abuts the outer annular rib (220) of the protective cover (22) via the abutting surface (421). The torque detection device for a power tool according to claim 7. The handle (12) includes a positioning space (121) and an electrical space (122) communicating with each other, the base column (41) is locked in the positioning space (121), and the platform (42) is 8. The torque sensing device for a power tool according to claim 7, wherein the electrical space (122) is penetrated and a mounting gap (122') is reserved. It further includes a battery (70) and a control board (80), the battery (70) and the control board (80) being installed within the mounting gap (122'), and the control board (80) comprising: The torque detection device for a power tool according to claim 9, wherein the power main body (21) and the torque sensor (50) are electrically connected.

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