Power tool and torque display device thereof

Abstract

The present invention relates to a power tool and its torque display device. The power tool includes a housing, a control panel disposed within the housing, a power unit, a bearing assembly, a transmission mechanism, and a torque shaft. The power unit is disposed within the housing via the bearing assembly and transmits torque through the transmission mechanism. The torque shaft is connected to the rear side of the power unit and rotates with the power unit. Furthermore, the power tool may include a torque sensor disposed at the rear side of the power unit to sense the torque of the power tool.

Description

Technical Field

[0001] The present invention relates to a power tool, and in particular to a power tool and a torque display device thereof. Background Art

[0002] Traditional power tools, such as electric screwdrivers and pneumatic wrenches, primarily consist of a housing, a power unit (e.g., a battery or high-pressure air), a transmission mechanism, and a control unit. The power unit is secured within the housing, its rotating shaft connected to the transmission mechanism. The control unit is electrically connected to the power unit. The control unit controls the power unit's operation, driving the transmission mechanism and the tool head mounted on it, thereby providing sufficient torque to rotate the tool head.

[0003] However, most 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. Therefore, improvement is needed.

[0004] Furthermore, existing power tools are equipped with torque sensors to detect torque and transmit a signal to a control unit to stop the power unit when a predetermined torque is reached. Furthermore, the torque sensor of a typical power tool is mounted on the transmission mechanism. As the transmission mechanism operates, the torque sensor rotates for extended periods, potentially leading to wire breakage and poor contact, affecting the electrical connection and damaging the power tool. Furthermore, when the power tool is in operation, the transmission mechanism connected to the tool head may vibrate or deform, affecting the torque value detected by the torque sensor and reducing its accuracy. Summary of the Invention

[0005] An object of the present invention is to provide a power tool having a power body that is capable of rotating relative to a housing through the arrangement of a bearing assembly, so that when a predetermined torque is exceeded, the power body enters a reverse state, and a torque sensor transmits a signal to a control panel to immediately stop the operation of the power body, thereby preventing damage to the power device or reducing the service life.

[0006] In order to achieve the above-mentioned purpose, the present invention is a power tool. The housing contains a storage space and a working end located in front of the storage space, and the working end has an opening. The control panel is arranged in the storage space. The power unit is arranged in the storage space, and the power unit includes a power body electrically connected to the control panel, a drive shaft driven by the power body, and a sleeve fitted with the power body. The bearing group is arranged between the sleeve and the housing so that the power body can rotate relative to the housing. The transmission mechanism is arranged in the storage space and is located on the front side of the power unit. The transmission mechanism includes a gearbox connected to the drive shaft and an actuating part protruding from the gearbox. The actuating part rotates with the gearbox and extends out of the opening of the housing to drive the tool to rotate. The torsion shaft is arranged in the storage space and is located on the rear side of the power unit relative to the transmission mechanism. The torsion shaft is connected to the power unit and rotates with the power unit.

[0007] Optionally, the power device further includes a linkage cover located between the sleeve and the torsion shaft, and two sides of the linkage cover are respectively connected to the sleeve and the torsion shaft.

[0008] Optionally, the protective cover has a front side and a rear side opposite to each other, the front side is formed with a plurality of first pawls, the rear side is formed with a plurality of second pawls, and the linkage cover is formed with a plurality of third pawls on the side facing the protective cover for docking with the second pawls.

[0009] Optionally, the linkage cover includes a cover and a sleeve connected to the cover, the cover is sleeved on a rear side of the power body and is formed with each of the third pawls, and the sleeve is sleeved on a front end of the torsion shaft.

[0010] Optionally, a rear support is further included, which is fixed in the shell and receives a rear end of the torsion shaft.

[0011] Optionally, two convex rings are formed on the outer edge surface of the torsion shaft and are spaced apart from each other, and each convex ring abuts against the sleeve and the rear bearing seat respectively.

[0012] Optionally, the transmission mechanism further includes a connecting ring, the connecting ring is formed with a plurality of protrusions arranged at intervals, and each of the protrusions engages each of the first pawls.

[0013] Optionally, the bearing group includes a front bearing and a rear bearing arranged at intervals, and a first annular rib is formed on the outer peripheral surface of the sleeve, and the front bearing and the rear bearing are respectively abutted against two sides of the first annular rib and form an annular groove; a second annular rib is formed on the inner wall surface of the shell, and the sleeve is positioned in the shell by abutting the first annular rib with the second annular rib.

[0014] Another object of the present invention is to provide a torque display device for a power tool, wherein the torque sensor is disposed on the rear side of the power body so as not to be affected by vibrations from external tool parts and thereby provide an accurate torque value.

[0015] To achieve the above objectives, the present invention is a torque display device for a power tool, including a power tool and a torque sensor. The torque sensor is disposed in a housing and located at the rear side of a power device.

[0016] Optionally, the torque sensor is arranged on the torsion shaft.

[0017] Compared to the prior art, the power tool of the present invention is provided with a bearing assembly between the power body and the housing, so that the power body can rotate relative to the housing and enter a reverse state after exceeding a predetermined torque. At this time, the torque sensor will transmit a signal to the control panel to immediately stop the operation of the power body, thereby causing damage to the power device or reducing its service life. Furthermore, the present invention also provides a torque display arrangement for the power tool, wherein the torque sensor is arranged on the rear side of the power body, so that the torque sensor is not affected by the vibration or deformation of the external tool parts and thus does not affect the torque sensing, and provides an accurate torque value. In addition, arranging the torque sensor at the rear end of the housing of the power tool can further reduce the space at the front end of the housing and avoid affecting the power output, so that the power can be transmitted more directly to the working end, increasing the practicality of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of a combined cross-sectional view of a power tool and a torque display device thereof according to the present invention.

[0019] Figure 2 It is a schematic three-dimensional appearance diagram of the transmission part of the present invention.

[0020] Figure 3 and Figure 4 It is a three-dimensional exploded schematic diagram of the transmission part of the present invention from two sides.

[0021] In the picture:

[0022] 1: Power tool; 2: Torque sensor; 3: Display; 10: Housing; 100: Accommodation space; 101: Working end; 102: Opening; 11: Main body; 12: Handle; 121: Button; 13: Second annular rib; 20: Control panel; 30: Power unit; 31: Power unit; 32: Drive shaft; 321: Driving gear; 33: Sheath; 330: Annular groove; 331: Front side; 3311: First pawl; 332: Rear side; 3321: Second pawl; 333: First annular rib; 34: Interlocking cover; 340: Third pawl; 341: Cover; 342: Sleeve; 3420: Hexagonal hole; 40: Bearing assembly; 41: Front bearing; 42: Rear bearing; 50: Transmission mechanism; 51: Gearbox; 52: Actuating part; 53: Connecting ring; 531: Protrusion; 60: Torque shaft; 61: Hexagonal column; 62: Protruding ring; 70: Rear support; 80: Battery. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0024] Please refer to Figure 1 , which is a schematic diagram of a combined sectional view of the power tool machine and its torque display arrangement of the present invention. The power tool machine 1 of the present invention includes a housing 10 and a control panel 20, a power device 30, a bearing group 40, a transmission mechanism 50 and a torsion shaft 60 arranged in the housing 10. The power device 30 is arranged in the housing 10 through the bearing group 40, and transmits the torque to a tool part (not shown) through the transmission of 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, thereby constituting the power tool machine 1. The structure of the power tool machine 1 is described in more detail below.

[0025] The housing 10 includes a receiving space 100 and a working end 101 located in front of the receiving space 100. 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.

[0026] 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 fitted over the power body 31, and a driving gear 321 coupled to the drive shaft 32. The driving gear 321 is connected to the transmission mechanism 50.

[0027] In this embodiment, the power body 31 is an electric motor that uses batteries as its power source to rotate the drive shaft 32. In actual implementation, the power body 31 can also be configured as a pneumatic motor that uses compressed air as its power source to rotate the drive shaft 32 using high-pressure gas.

[0028] Furthermore, the bearing assembly 40 is disposed between the sleeve 33 and the housing 10 so that the power body 31 (together with the sleeve 33 ) can rotate relative to the housing 10 .

[0029] Furthermore, the transmission mechanism 50 is disposed within the accommodating space 100 and located in front of the power unit 30. The transmission mechanism 50 includes an actuator 52. As the drive shaft 32 rotates and extends out of the opening 102 of the housing, the actuator 52 drives a tool (not shown) for rotation. Furthermore, the torsion shaft 60 is disposed within the accommodating space 100 and located behind the power unit 30, relative to the transmission mechanism 50. Furthermore, the torsion shaft 60 is connected to the power unit 30 and rotates with it.

[0030] 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 portion 52 is connected to the gearbox 51 for rotational output.

[0031] The housing 10 includes a main body 11 and a handle 12 connected to the main body 11. The power unit 30 and the transmission mechanism 50 are disposed on the main body 11. The handle 12 is provided with a button 121 that is exposed from the housing. Furthermore, in this embodiment, the power tool 1 further includes a battery 80. The battery 80 is disposed on the handle 12 and electrically connected to the control board 20 to provide the power required for operation of the power tool 1.

[0032] It should be noted that, in actual implementation, the torsion shaft 60 may 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 a side of the battery 80 or the button 121 .

[0033] The present invention further provides a torque display device for a power tool, comprising the aforementioned power tool 1 and a torque sensor 2. The torque sensor 2 can be configured as a strain gauge, disposed within the accommodating space 100 and located behind the power unit 30. In this embodiment, the torque sensor 2 is mounted on the torque shaft 60 to sense the torque of the power tool 1. In actual implementation, the torque sensor 2 can also be mounted on the sleeve 342 or the rear bearing 70, described below.

[0034] It is worth noting that the power tool 1 of the present invention further includes a display 3 . The display 3 is exposed outside the housing 10 and is electrically connected to the control board 20 , for displaying the torque value of the power tool 1 .

[0035] Please refer to Figures 2 to 4 , respectively, are a schematic perspective view of the transmission portion of the present invention and an exploded perspective view from two sides. As shown in the figures, in one embodiment of the present invention, the power unit 30 further includes a linkage cover 34 positioned between the sheath 33 and the torsion shaft 60. Specifically, the linkage cover 34 is connected to the sheath 33 and the torsion shaft 60 on both sides.

[0036] like Figure 3 and Figure 4 As shown. In more detail, the sleeve 33 has a front side 331 and a rear side 332 relative to each other. The front side 331 is formed with a plurality of first pawls 3311, and the rear side 332 is formed with a plurality of second pawls 3321. The linkage cover 34 is formed with a plurality of third pawls 340 that dock with the second pawls 3321 on the side facing the sleeve 33. In addition, the linkage cover 34 includes a cover 341 and a sleeve 342 connected to the cover 341. The cover 341 is fitted on a rear side of the power body 31 and is formed with the third pawls 340. The sleeve 342 is fitted on the front end of the torsion shaft 60. In this embodiment, the sleeve 342 is formed with a hexagonal hole 3420 (see Figure 4 ), a hexagonal column 61 is formed at the front end of the torsion shaft 60, and the torsion shaft 60 is inserted into the hexagonal hole 3420 through the hexagonal column 61 and combined in the sleeve 342.

[0037] In this embodiment, the power tool 1 further includes a rear support 70. The rear support 70 is fixed in the housing 10 (see Figure 1 ) and receives a rear end of the torsion shaft 60. Specifically, the outer edge of the torsion shaft 60 is formed with two spaced-apart raised rings 62. These raised rings 62 abut against the sleeve 342 and the rear support 70, respectively. Consequently, the torsion shaft 60 is supported between the linkage cover 34 and the rear support 70.

[0038] Furthermore, in one 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 spaced apart from each other, and each of the protrusions 531 engages each of the first pawls 3311 .

[0039] It should be noted that the bearing assembly 40 disposed between the sleeve 33 and the housing 10 includes a front bearing 41 and a rear bearing 42 spaced apart. A first annular rib 333 is formed on the outer peripheral surface of the sleeve 33. The front bearing 41 and the rear bearing 42 are respectively abutted against two sides of the first annular rib 333 and form an annular groove 330 (see also Figure 2 In addition, the inner wall surface of the housing 10 is formed with a second annular rib 13 (see also Figure 1 The sheath 33 is positioned in the housing 10 by the second annular rib 13 abutting against the first annular rib 333 .

[0040] Accordingly, the user presses the button 121 to trigger the control panel 20 to start operation. The control panel 20 causes the power body 31 to start running. In addition, 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 portion 52 of the transmission mechanism 50 can drive the external tool part to rotate. Subsequently, after exceeding the predetermined torque, the power body 31 rotates relative to the housing 10 through the setting of the bearing group 40. At this time, the linkage cover 34 and the torsion shaft 60 will rotate together with the power body 31. In addition, the torque sensor 2 arranged on the rear side of the power body 31 can sense the torque received, and this torque signal will be transmitted through the control panel 20 and displayed on the display 3.

[0041] It should be noted that the power body 31 of the present invention enters a reverse state after exceeding a predetermined torque, transmitting the torque to the torque shaft 60. At this point, the torque sensor 2 transmits a signal to the control board to immediately stop the operation of the power body 31. Furthermore, because the torque sensor 2 of the present invention is located at the rear side of the power body 31, it is not affected by vibrations from external tool components and thus provides accurate torque readings. Furthermore, placing the torque sensor 2 at the rear end of the housing 10 of the power tool 1 further reduces space at the front end of the housing 10, thereby avoiding any impact on power output and allowing for more direct power transmission to the working end 101.

[0042] The above embodiments are merely preferred embodiments for the purpose of fully illustrating the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are within the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

Claims

1. A power tool, characterized in that: include: A housing comprising a receiving space and a working end located in front of the receiving space, wherein the working end has an opening; a control panel, disposed in the accommodating space; a power device disposed in the accommodating space, the power device comprising a power body electrically connected to the control board, a drive shaft driven by the power body, and a sheath sleeved around the power body; a bearing assembly disposed between the sleeve and the housing to enable the power body to rotate relative to the housing; a transmission mechanism disposed in the accommodating space and located in front of the power device, the transmission mechanism comprising an actuating portion that drives a tool to rotate as the drive shaft rotates and extends out of the opening of the housing; a torsion shaft disposed in the accommodating space and located at the rear side of the power device relative to the transmission mechanism, the torsion shaft being connected to the power device and rotating with the power device; as well as A linkage cover is located between the sleeve and the torsion shaft, and two sides of the linkage cover are respectively connected to the sleeve and the torsion shaft.

2. The power tool according to claim 1, wherein: The protective cover has a front side and a rear side opposite to each other, the front side is formed with a plurality of first pawls, the rear side is formed with a plurality of second pawls, and the linkage cover is formed with a plurality of third pawls on a side facing the protective cover to engage with the second pawls.

3. The power tool according to claim 2, wherein: The linkage cover includes a cover and a sleeve connected to the cover. The cover is sleeved on a rear side of the power body and is formed with each of the third pawls. The sleeve is sleeved on a front end of the torsion shaft.

4. The power tool according to claim 3, wherein: It also includes a rear support seat, which is fixed in the shell and receives a rear end of the torsion shaft.

5. The power tool according to claim 4, wherein: The outer edge surface of the torsion shaft is formed with two convex rings which are spaced apart from each other, and each convex ring abuts against the sleeve and the rear bearing seat respectively.

6. The power tool according to claim 2, wherein: The transmission mechanism further comprises a connecting ring, wherein the connecting ring is formed with a plurality of protrusions arranged at intervals, and each of the protrusions is used to engage each of the first pawls.

7. The power tool according to claim 1, wherein: The bearing group includes a front bearing and a rear bearing arranged at intervals. A first annular rib is formed on the outer peripheral surface of the sleeve. The front bearing and the rear bearing are respectively abutted against two sides of the first annular rib and form an annular groove; a second annular rib is formed on the inner wall surface of the shell. The sleeve is positioned in the shell by the second annular rib abutting against the first annular rib.

8. A torque display device for a power tool, characterized in that: The invention comprises a power tool according to any one of claims 1 to 7 and a torque sensor, wherein the torque sensor is arranged in the housing and located at the rear side of the power device.

9. The torque display device for a power tool according to claim 8, wherein: The torque sensor is arranged on the torque shaft.

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