Novel high-precision torque-adjustable electric wrench

Abstract

The novel high-precision torque-adjustable electric wrench comprises a plastic outer shell and a head shell, the head shell is installed on the front side of the plastic outer shell, and an adjustable-speed motor, a speed reducing mechanism, an impact mechanism and a square shaft which are sequentially in transmission connection from inside to outside are arranged in the plastic outer shell. The adjustable-speed motor is adopted as a power source, the torque can be adjusted by adjusting the rotating speed of the motor, the torque can also be adjusted by adjusting the transmission ratio of the speed reducing mechanism, the torque of the electric wrench can be adjusted, and larger torque output can be provided due to the multi-stage speed reducing structure of the speed reducing mechanism.

Description

Technical Field

[0001] The utility model relates to the technical field of electric wrenches, in particular to a novel high-precision torque-adjustable electric wrench. Background Art

[0002] Electric wrenches are widely used in various industries and fields, especially in automotive manufacturing, machinery manufacturing, aerospace, and other fields. Compared with traditional manual wrenches, electric wrenches are more efficient. They can quickly rotate and tighten bolts or nuts, greatly reducing working time and improving production efficiency. However, existing electric wrenches have a fixed torque range and cannot be flexibly adjusted, resulting in a limited range of applications.

[0003] In view of this, the inventors of this case conducted in-depth research on the above-mentioned issues, which led to the creation of this case. Utility Model Content

[0004] The purpose of the utility model is to address the above shortcomings and provide a new type of high-precision adjustable torque electric wrench which can achieve large torque output and adjustable torque.

[0005] The solution adopted by the utility model to solve the technical problem is: a new type of high-precision adjustable torque electric wrench, including a plastic shell and a head shell, the head shell is installed on the front side of the plastic shell, and the plastic shell is provided with a speed regulating motor, a reduction mechanism, an impact mechanism and a square shaft that are sequentially connected from the inside to the outside. The reduction mechanism includes a transmission shaft, a sliding gear assembly, a driven gear assembly and a clutch assembly, one end of the transmission shaft is connected to the speed regulating motor, and the other end of the transmission shaft is connected to the sliding gear assembly, the sliding gear assembly is slidably installed in the plastic shell, the driven gear assembly is provided beside the sliding gear assembly so as to engage with the sliding gear assembly, and the clutch assembly is connected to the sliding gear assembly to drive the sliding gear assembly to slide, thereby switching the meshing state of the sliding gear assembly and the driven gear assembly.

[0006] Furthermore, in order to provide multiple transmission ratios to adjust the torque output of the electric wrench; the sliding gear assembly includes a gear seat and a gear shaft, the gear shaft is rotatably mounted on the gear seat, one end of the gear shaft is connected to the transmission shaft, a transmission key is provided on the transmission shaft, a transmission shaft hole for inserting the transmission shaft and a keyway for inserting the transmission key are provided in the gear shaft, and a first gear, a second gear and a third gear with different numbers of teeth are provided on the gear shaft along the axial direction of the gear shaft, the gear seat is slidably mounted in a plastic housing, and the clutch assembly is connected to the gear seat to drive the gear seat to slide, thereby switching the first gear, the second gear or the third gear to engage with the driven gear assembly.

[0007] Furthermore, in order to form a multi-stage gear transmission mechanism to provide greater torque output; the driven gear assembly includes a primary gear, a primary gear shaft, an intermediate gear, a secondary gear, a secondary gear shaft and a planetary gear set, the primary gear shaft is rotatably mounted in a plastic housing and is located next to the gear shaft, the primary gear is coaxially fixed on the primary gear shaft so as to engage with the first gear, the second gear or the third gear, the intermediate gear is coaxially fixed on the primary gear shaft, the secondary gear shaft is rotatably mounted in the plastic housing, the secondary gear is coaxially fixed on the secondary gear shaft and the secondary gear is engaged with the intermediate gear, the secondary gear shaft is connected to the planetary gear set, and the planetary gear set is connected to the impact mechanism.

[0008] Furthermore, in order to drive the gear seat to slide so as to switch the first gear, the second gear or the third gear to engage with the driven gear assembly; the clutch assembly includes a clutch motor and a clutch screw group, the clutch motor is installed in a plastic housing, the clutch screw group includes a screw and a screw nut seat, the screw is rotatably installed in the plastic housing, one end of the screw is transmission-connected to the clutch motor, the screw nut seat is transmission-installed on the screw, and the screw nut seat is fixedly connected to the gear seat to drive the gear seat to move back and forth so as to switch the first gear, the second gear or the third gear to engage with the driven gear assembly.

[0009] Furthermore, in order to convert the electric wrench into a torque wrench for tightening bolts and nuts, the novel high-precision adjustable torque electric wrench further includes a ratchet mechanism and a hexagonal socket, the ratchet mechanism includes a ratchet box, a swing assembly and a ratchet assembly, the ratchet box is provided with a handle for holding, the swing assembly and the ratchet assembly are both arranged in the ratchet box, the swing assembly is transmission-connected to the square shaft, the ratchet assembly is transmission-connected to the swing assembly so that the swing assembly drives the ratchet assembly to rotate forward and reverse, and the hexagonal socket is installed on the ratchet assembly so that the ratchet assembly drives the ratchet assembly to tighten the bolts and nuts;

[0010] The swing assembly includes a drive shaft, a rotating rod, a swing rod, a swing shaft, a fan gear and a swing gear, the drive shaft is rotatably mounted in the ratchet box, one end of the drive shaft is connected to the square shaft for transmission, the other end of the drive shaft is fixedly connected to one end of the rotating rod to drive the rotating rod to rotate, the other end of the rotating rod is provided with a slider, the swing shaft is rotatably mounted in the ratchet box, one end of the swing rod is fixedly mounted on the swing shaft, the swing rod is provided with a slide groove, and the slider is slidably mounted on the slide groove so that the swing rod is driven to swing by the rotation of the rotating rod, the fan gear is coaxially fixedly mounted on the swing shaft so as to swing with the swing rod, the swing gear is rotatably mounted in the ratchet box, and the swing gear is meshed with the fan gear so as to drive the swing gear to be forward and reversed by the back and forth swing of the fan gear, and the swing gear is coaxially fixedly connected to the ratchet assembly to drive the ratchet assembly to be forward and reverse.

[0011] Furthermore, in order to drive the hexagonal socket to rotate unidirectionally, torque is applied slowly to ensure precise control of the torque; the ratchet assembly includes a ratchet shaft, a ratchet, a pawl, a spring and a connecting shaft for installing the hexagonal socket, the ratchet shaft is rotatably installed in the ratchet box, the ratchet and the swing gear are coaxially fixedly installed on the ratchet shaft, and a turntable is also rotatably installed on the ratchet shaft through a bearing, one end of the pawl is rotatably installed on the turntable, and the other end of the pawl is arranged next to the ratchet, one end of the spring is installed on one side of the pawl, and the other end of the spring is installed on the turntable and located on the other side of the pawl, the connecting shaft is rotatably installed on the ratchet box, one end of the connecting shaft is coaxially fixedly connected to the turntable, and the other end of the connecting shaft is connected to the hexagonal socket via a dynamic torque sensor.

[0012] Compared with the existing technology, the utility model has the following advantages: the utility model adopts a speed-regulating motor as a power source, and can adjust the torque by adjusting the speed of the motor, and can also adjust the torque by adjusting the transmission ratio of the reduction mechanism, thereby realizing the adjustable torque of the electric wrench. Moreover, the multi-stage reduction structure of the reduction mechanism can provide a greater torque output. In addition to installing screws and ordinary nuts, the present application can also install bolts and nuts with high torque requirements. When in use, by installing the ratchet mechanism on the square shaft, the nut is driven by the ratchet mechanism to rotate unidirectionally and lock, and the real-time measurement of the dynamic torque sensor is combined to ensure high-precision installation. It is very convenient and reliable to use and can meet a variety of installation needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0014] Figure 1 It is a structural diagram of the utility model;

[0015] Figure 2 Schematic diagram of the reduction mechanism Figure 1 ;

[0016] Figure 3 Schematic diagram of the reduction mechanism Figure 2 ;

[0017] Figure 4 Schematic diagram of the structure of the ratchet mechanism;

[0018] Figure 5 It is a three-dimensional structural diagram of the ratchet mechanism;

[0019] Figure 6 Schematic diagram of the swing assembly structure Figure 1 ;

[0020] Figure 7 Schematic diagram of the swing assembly structure Figure 2 ;

[0021] Figure 8 Schematic diagram of the ratchet assembly Figure 1 ;

[0022] Figure 9 Schematic diagram of the ratchet assembly Figure 2 .

[0023] In the figure: plastic housing 1; head housing 2; speed regulating motor 3; reduction mechanism 4; transmission shaft 41; sliding gear assembly 42; gear shaft 421; gear seat 422; first gear 423; second gear 424; third gear 425; driven gear assembly 43; first gear 431; intermediate gear 432; first gear shaft 433; second gear 434; second gear shaft 435; planetary gear set 436; clutch assembly 44; clutch motor 441; screw rod 442; screw rod Nut seat 443; impact mechanism 5; square shaft 6; ratchet mechanism 7; ratchet box 71; handle 711; swing assembly 72; drive shaft 721; rotating rod 722; slider 7221; swing rod 723; slide groove 7231; swing shaft 724; sector gear 725; swing gear 726; ratchet assembly 73; ratchet shaft 731; ratchet 732; pawl 733; spring 734; connecting shaft 735; turntable 736; hexagon socket 8; dynamic torque sensor 9. DETAILED DESCRIPTION

[0024] The following is a detailed description of the present invention in conjunction with the accompanying drawings and specific embodiments:

[0025] Example: Figure 1-9 As shown, this embodiment provides a new type of high-precision adjustable torque electric wrench, including a plastic shell 1 and a head shell 2, the head shell 2 is installed on the front side of the plastic shell 1, and the plastic shell 1 is provided with a speed regulating motor 3, a reduction mechanism 4, an impact mechanism 5 and a square shaft 6 that are sequentially connected from the inside to the outside. The reduction mechanism 4 includes a transmission shaft 41, a sliding gear assembly 42, a driven gear assembly 43 and a clutch assembly 44. One end of the transmission shaft 41 is connected to the speed regulating motor 3, and the other end of the transmission shaft 41 is connected to the sliding gear assembly 42. The sliding gear assembly 42 is slidably installed in the plastic shell, and the driven gear assembly 43 is provided beside the sliding gear assembly 42 so as to engage with the sliding gear assembly 42. The clutch assembly 44 is connected to the sliding gear assembly 42 to drive the sliding gear assembly 42 to slide, thereby switching the meshing state of the sliding gear assembly 42 and the driven gear assembly 43.

[0026] In this embodiment, in order to provide a variety of transmission ratios to adjust the torque output of the electric wrench; the sliding gear assembly 42 includes a gear seat 422 and a gear shaft 421, the gear shaft 421 is rotatably mounted on the gear seat 422, one end of the gear shaft 421 is connected to the transmission shaft 41, the transmission shaft 41 is provided with a transmission key, the gear shaft 421 is provided with a transmission shaft 41 hole for inserting the transmission shaft 41 and a keyway for inserting the transmission key, the gear shaft 421 is provided with a first gear 423, a second gear 424 and a third gear 425 with different numbers of teeth along the axial direction of the gear shaft 421, the gear seat 422 is slidably mounted in a plastic housing, the clutch assembly 44 is connected to the gear seat 422 to drive the gear seat 422 to slide, thereby switching the first gear 423, the second gear 424 or the third gear 425 to engage with the driven gear assembly 43.

[0027] In this embodiment, in order to form a multi-stage gear transmission mechanism to provide greater torque output; the driven gear assembly 43 includes a primary gear 431, a primary gear shaft 433, an intermediate gear 432, a secondary gear 434, a secondary gear shaft 435 and a planetary gear set 436, the primary gear shaft 433 is rotatably mounted in a plastic housing and is located next to the gear shaft 421, the primary gear 431 is coaxially fixed on the primary gear shaft 433 so as to engage with the first gear 423, the second gear 424 or the third gear 425, the intermediate gear 432 is coaxially fixed on the primary gear shaft 433, the secondary gear shaft 435 is rotatably mounted in the plastic housing, the secondary gear 434 is coaxially fixed on the secondary gear shaft 435 and the secondary gear 434 is engaged with the intermediate gear 432, the secondary gear shaft 435 is connected to the planetary gear set 436, and the planetary gear set 436 is connected to the impact mechanism 5.

[0028] In this embodiment, in order to drive the gear seat 422 to slide, so as to switch the first gear 423, the second gear 424 or the third gear 425 to engage with the driven gear assembly 43; the clutch assembly 44 includes a clutch motor 441 and a clutch screw group, and the clutch motor 441 is installed in a plastic housing, and the clutch screw group includes a screw rod 442 and a screw rod nut seat 443, and the screw rod 442 is rotatably installed in the plastic housing, one end of the screw rod 442 is transmission-connected to the clutch motor 441, and the screw rod nut seat 443 is transmission-installed on the screw rod 442, and the screw rod nut seat 443 is fixedly connected to the gear seat 422 to drive the gear seat 422 to move back and forth, thereby switching the first gear 423, the second gear 424 or the third gear 425 to engage with the driven gear assembly 43.

[0029] In this embodiment, in order to convert the electric wrench into a torque wrench for tightening bolts and nuts, the new high-precision adjustable torque electric wrench also includes a ratchet mechanism 7 and a hexagonal socket 8. The ratchet mechanism 7 includes a ratchet box 71, a swing assembly 72 and a ratchet assembly 73. The ratchet box 71 is provided with a handle 711 for holding. The swing assembly 72 and the ratchet assembly 73 are both arranged in the ratchet box 71. The swing assembly 72 is transmission-connected to the square shaft 6. The ratchet assembly 73 is transmission-connected to the swing assembly 72 so that the swing assembly 72 drives the ratchet assembly 73 to rotate forward and reverse. The hexagonal socket 8 is installed on the ratchet assembly 73 so that the ratchet assembly 73 drives the bolts and nuts to be tightened.

[0030] The swing assembly 72 includes a drive shaft 721, a rotating rod 722, a swing rod 723, a swing shaft 724, a fan gear 725 and a swing gear 726. The drive shaft 721 is rotatably mounted in the ratchet box 71. One end of the drive shaft 721 is transmission-connected to the square shaft 6. The other end of the drive shaft 721 is fixedly connected to one end of the rotating rod 722 to drive the rotating rod 722 to rotate. The other end of the rotating rod 722 is provided with a slider 7221. The swing shaft 724 is rotatably mounted in the ratchet box 71. One end of the swing rod 723 is fixedly mounted on the swing shaft 724. A sliding groove 7231 is provided on the swing rod 723, and the slider 7221 is slidably installed on the sliding groove 7231 so that the swing rod 723 can be driven to swing by the rotating rod 722. The fan gear 725 is coaxially fixedly installed on the swing shaft 724 so as to swing with the swing rod 723. The swing gear 726 is rotatably installed in the ratchet box 71, and the swing gear 726 is engaged with the fan gear 725 so that the back and forth swing of the fan gear 725 drives the swing gear 726 to rotate forward and reverse. The swing gear 726 is coaxially fixedly connected to the ratchet assembly 73 to drive the ratchet assembly 73 to rotate forward and reverse.

[0031] In this embodiment, in order to drive the hexagon socket 8 to rotate in one direction, the torque is applied slowly to ensure the precise control of the torque; the ratchet assembly 73 includes a ratchet shaft 731, a ratchet 732, a pawl 733, a spring 734 and a connecting shaft 735 for mounting the hexagon socket 8, the ratchet shaft 731 is rotatably mounted in the ratchet box 71, the ratchet 732 and the swing gear 726 are coaxially fixedly mounted on the ratchet shaft 731, and the ratchet shaft 731 is also rotatably mounted with a turntable 7 through a bearing. 36, one end of the pawl 733 is rotatably mounted on the turntable 736, and the other end of the pawl 733 is located next to the ratchet 732, one end of the spring 734 is mounted on one side of the pawl 733, and the other end of the spring 734 is mounted on the turntable 736 and is located on the other side of the pawl 733, the connecting shaft 735 is rotatably mounted on the ratchet box 71, one end of the connecting shaft 735 is coaxially fixedly connected to the turntable 736, and the other end of the connecting shaft 735 is connected to the hexagonal socket 8 via the dynamic torque sensor 9.

[0032] Specific implementation process: When in use, according to the installation requirements of the nut, adjust the speed of the speed regulating motor 3, and start the clutch motor 441 to select the transmission ratio of the reduction mechanism 4. After adjustment, install the tool head on the square shaft 6 and drive the speed regulating motor 3. The torque of the speed regulating motor 3 is transmitted to the tool head through the reduction mechanism 4, the impact mechanism 5 and the square shaft 6 to control the rotation of the nut or screw to complete the installation. If a nut with high torque requirements needs to be installed, install the ratchet mechanism 7 on the square shaft 6. The power output by the square shaft 6 will drive the rotating rod 722. After the pawl 733 is engaged with the ratchet 732, the pawl 733 and the rotary disk 736 fixedly connected with the pawl 733 rotate, thereby driving the hexagonal socket 8 to rotate and locking the nut. The swing gear 726 swings back and forth once the nut rotates one unit, and the torque is slowly applied, thereby achieving precise control of the torque.

[0033] The above description is merely an embodiment of the present invention and does not limit the scope of patent protection of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the scope of patent protection of the present invention.

Claims

1. A new type of high-precision adjustable torque electric wrench, characterized by: It includes a plastic shell and a head shell, the head shell is installed on the front side of the plastic shell, and the plastic shell is provided with a speed regulating motor, a reduction mechanism, an impact mechanism and a square shaft that are sequentially connected from the inside to the outside. The reduction mechanism includes a transmission shaft, a sliding gear assembly, a driven gear assembly and a clutch assembly. One end of the transmission shaft is connected to the speed regulating motor, and the other end of the transmission shaft is connected to the sliding gear assembly. The sliding gear assembly is slidably installed in the plastic shell, and the driven gear assembly is provided beside the sliding gear assembly so as to engage with the sliding gear assembly. The clutch assembly is connected to the sliding gear assembly to drive the sliding gear assembly to slide, thereby switching the meshing state of the sliding gear assembly and the driven gear assembly.

2. The new high-precision adjustable torque electric wrench according to claim 1 is characterized in that: The sliding gear assembly includes a gear seat and a gear shaft, the gear shaft is rotatably mounted on the gear seat, one end of the gear shaft is connected to the transmission shaft, a transmission key is provided on the transmission shaft, a transmission shaft hole for inserting the transmission shaft and a keyway for inserting the transmission key are provided in the gear shaft, a first gear, a second gear and a third gear with different numbers of teeth are provided on the gear shaft along the axial direction of the gear shaft, the gear seat is slidably mounted in a plastic housing, and the clutch assembly is connected to the gear seat to drive the gear seat to slide, thereby switching the first gear, the second gear or the third gear to engage with the driven gear assembly.

3. The new high-precision adjustable torque electric wrench according to claim 2 is characterized in that: The driven gear assembly includes a primary gear, a primary gear shaft, an intermediate gear, a secondary gear, a secondary gear shaft and a planetary gear set. The primary gear shaft is rotatably mounted in a plastic housing and is located next to the gear shaft. The primary gear is coaxially fixed on the primary gear shaft so as to mesh with the first gear, the second gear or the third gear. The intermediate gear is coaxially fixed on the primary gear shaft. The secondary gear shaft is rotatably mounted in the plastic housing. The secondary gear is coaxially fixed on the secondary gear shaft and the secondary gear meshes with the intermediate gear. The secondary gear shaft is connected to the planetary gear set, and the planetary gear set is connected to the impact mechanism.

4. The new high-precision adjustable torque electric wrench according to claim 2 is characterized in that: The clutch assembly includes a clutch motor and a clutch screw group. The clutch motor is installed in a plastic housing. The clutch screw group includes a screw and a screw nut seat. The screw is rotatably installed in the plastic housing. One end of the screw is transmission-connected to the clutch motor. The screw nut seat is transmission-mounted on the screw, and the screw nut seat is fixedly connected to the gear seat to drive the gear seat to reciprocate, thereby switching the first gear, the second gear or the third gear to engage with the driven gear assembly.

5. The new high-precision adjustable torque electric wrench according to claim 1 is characterized in that: The novel high-precision adjustable torque electric wrench also includes a ratchet mechanism and an inner hexagon socket. The ratchet mechanism includes a ratchet box, a swing assembly and a ratchet assembly. The ratchet box is provided with a handle for holding. The swing assembly and the ratchet assembly are both arranged in the ratchet box. The swing assembly is transmission-connected to the square shaft. The ratchet assembly is transmission-connected to the swing assembly so that the swing assembly drives the ratchet assembly to rotate forward and reverse. The inner hexagon socket is mounted on the ratchet assembly so that the ratchet assembly drives the ratchet assembly to tighten the bolts and nuts. The swing assembly includes a drive shaft, a rotating rod, a swing rod, a swing shaft, a fan gear and a swing gear, the drive shaft is rotatably mounted in the ratchet box, one end of the drive shaft is connected to the square shaft for transmission, the other end of the drive shaft is fixedly connected to one end of the rotating rod to drive the rotating rod to rotate, the other end of the rotating rod is provided with a slider, the swing shaft is rotatably mounted in the ratchet box, one end of the swing rod is fixedly mounted on the swing shaft, the swing rod is provided with a slide groove, and the slider is slidably mounted on the slide groove so that the swing rod is driven to swing by the rotation of the rotating rod, the fan gear is coaxially fixedly mounted on the swing shaft so as to swing with the swing rod, the swing gear is rotatably mounted in the ratchet box, and the swing gear is meshed with the fan gear so as to drive the swing gear to be forward and reversed by the back and forth swing of the fan gear, and the swing gear is coaxially fixedly connected to the ratchet assembly to drive the ratchet assembly to be forward and reverse.

6. The new high-precision adjustable torque electric wrench according to claim 5 is characterized in that: The ratchet assembly includes a ratchet shaft, a ratchet, a pawl, a spring and a connecting shaft for installing a hexagonal socket. The ratchet shaft is rotatably installed in the ratchet box, the ratchet and the swing gear are coaxially fixedly installed on the ratchet shaft, and a turntable is rotatably installed on the ratchet shaft through a bearing. One end of the pawl is rotatably installed on the turntable, and the other end of the pawl is arranged next to the ratchet. One end of the spring is installed on one side of the pawl, and the other end of the spring is installed on the turntable and is located on the other side of the pawl. The connecting shaft is rotatably installed on the ratchet box, one end of the connecting shaft is coaxially fixedly connected to the turntable, and the other end of the connecting shaft is connected to the hexagonal socket via a dynamic torque sensor.

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