Large-torque wrench

Abstract

The utility model provides a large torque wrench which comprises a sleeve, a connecting thread sleeve and an output device, the output device is connected with the sleeve through the connecting thread sleeve, a transmission device used for transmitting the output device is arranged in the sleeve, and the transmission device comprises an input shaft, an output disc, a gear ring and a plurality of pinions. The multiple pinions are annularly and concentrically pivoted to the output disc, the gear ring is fixed in the sleeve, the multiple pinions are meshed with the gear ring, the input shaft comprises an input wrench, a transmission shaft and a spline gear shaft which are sequentially connected, the transmission shaft is pivoted to the interior of the sleeve through a bearing, the spline gear shaft is inserted in the middle of the multiple pinions, and the input wrench is connected with the transmission shaft. And a plurality of gears engaged with the plurality of pinions. The input rotating speed of the spline gear shaft is greatly reduced to the rotating speed of the output disc through the planetary gear set composed of the pinions, the torque of the output disc is increased while the rotating speed is reduced, the risk that the output device is thrown out instantly is reduced, and the risk that the hands of an operator are driven to rotate instantly is avoided.

Description

Technical Field

[0001] This utility model relates to the field of maintenance tool technology, specifically a high torque wrench. Background Technology

[0002] The advent of electric wrenches has greatly improved workers' efficiency. However, with the mass production of small equipment, the number of bolts used on this equipment is also increasing. Small equipment typically has limited space for bolt installation. If a standard open-end wrench is used, it is inserted from the side opening. However, during tightening or loosening operations, after rotating the threaded part by a small angle, the wrench needs to be removed from the threaded part and then placed back on at a different angle to continue rotating. This process usually needs to be repeated multiple times until the threaded part is fully tightened or loosened, making operation inconvenient.

[0003] Therefore, right-angle electric wrenches have emerged on the market. By changing the direction of force at a right angle, they can tighten screws in confined spaces. However, current electric drives are often one-to-one, resulting in high transmission speed but low torque, and are prone to sudden rapid rotation, causing the operator's hand to be instantly pulled along, posing a significant safety hazard. Secondly, the right-angle conversion head is usually threaded to the transmission unit. Prolonged vibration combined with sudden rapid rotation can easily cause the right-angle conversion head to detach and fly off, posing a risk of accidental injury to the operator.

[0004] Based on the aforementioned issues, this case arises. Utility Model Content

[0005] In view of the shortcomings of the prior art, this utility model provides a high torque wrench, which solves the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-torque wrench includes a socket, a connecting screw sleeve, and an output device. The output device is connected to the socket via the connecting screw sleeve. A transmission device for driving the output device is provided inside the socket. The transmission device includes an input shaft, an output disc, a gear ring, and multiple pinions. The multiple pinions are concentrically pivotally connected to the output disc. The gear ring is fixed inside the socket, and all the pinions mesh with the gear ring. The input shaft includes an input wrench head, a transmission shaft, and a splined gear shaft connected in sequence. The transmission shaft is pivotally connected to the socket via a bearing. The splined gear shaft is inserted in the middle of the multiple pinions and meshes with them. The output disc has a splined hole for connecting the output device.

[0007] Preferably, the top of the sleeve is provided with a sleeve connecting thread, and the upper and lower sections inside the connecting thread sleeve are upper internal thread and lower internal thread with opposite thread directions, and the sleeve connecting thread is threadedly connected to the lower internal thread.

[0008] Preferably, the output device is a right-angle output device, which includes a base, a swing arm, an output wrench, and an output wheel. The bottom of the base is provided with a base connection screw that connects to the upper internal screw. The top of the swing arm is rotatably connected to the base. The output wrench is pivotally connected to the base via the output wheel. A ratchet ring is provided inside the swing arm. A semi-circular plate is rotatably provided on the edge of the output wheel. The side of the semi-circular plate is provided with a ratchet portion with teeth in the opposite direction to the ratchet ring and engages with the ratchet ring. An output shaft is axially pivotally connected inside the base. An eccentric shaft is eccentrically provided at the top of the output shaft. The bottom of the swing arm is provided with a movable cavity into which the eccentric shaft can extend. A spline shaft that can be inserted into a spline hole is provided at the bottom of the output shaft.

[0009] Preferably, the output device is a linear output device, which includes a straight cylinder, a linear wrench, and a second splined shaft. The linear wrench is pivotally connected to the straight cylinder via a bearing, and the linear wrench is coaxially connected to the second splined shaft and can be inserted into the splined hole. The bottom of the straight cylinder is provided with a straight cylinder connecting screw that can be connected to the upper internal thread.

[0010] Preferably, at least two bearings are provided, and the two bearings are distributed on the upper and lower sides of the drive shaft.

[0011] Preferably, the number of pinions is at least three.

[0012] Preferably, the top of the eccentric shaft is provided with a spherical head.

[0013] This utility model provides a high-torque wrench. It has the following beneficial effects:

[0014] This high-torque wrench, when the electric screwdriver is input through the input head, transmits the torque to the spline gear shaft, causing multiple small gears to rotate simultaneously along the ring gear. These small gears then drive the output disc to rotate. The input speed of the spline gear shaft is greatly reduced to the output disc speed through the planetary gear set composed of multiple small gears. This reduction in speed increases the torque of the output disc, lowering the risk of the output device being thrown off instantly and eliminating the risk of the operator's hand being instantly pulled and rotated.

[0015] This high-torque wrench features an upper and lower internal thread with opposite helical directions. Assuming the connecting sleeve is vertical, and the base connecting thread at the bottom of the base, the straight connecting thread at the bottom of the straight cylinder, and the upper internal thread are all tightened counterclockwise, the socket connecting thread at the top of the sleeve and the lower internal thread are also tightened counterclockwise. This design ensures that when the electric screwdriver rotates counterclockwise, the sleeve and connecting sleeve will only tighten and not loosen. At the same time, since the output wrench also rotates counterclockwise, the connecting sleeve and the connecting thread on the base will also only tighten and not loosen. This makes it less likely for the adapter to fly off the sleeve, reducing the risk. Attached Figure Description

[0016] Figure 1 This is an overall external isometric view of the present invention;

[0017] Figure 2 This is an isometric drawing of the sleeve of this utility model;

[0018] Figure 3 This is a half-sectional schematic diagram of the sleeve of this utility model;

[0019] Figure 4 This is an external isometric view of the right-angle output device of this utility model;

[0020] Figure 5 This is a cross-sectional view of the right-angle output device of this utility model.

[0021] Figure 6 This is an external isometric view of the linear output device of this utility model.

[0022] In the diagram: 1. Sleeve, 2. Connecting screw sleeve, 3. Base, 4. Swing arm, 5. Output wrench, 6. Output wheel, 7. Ratchet ring, 8. Semicircular plate, 9. Pad, 10. Output shaft, 11. Eccentric shaft, 12. Movable cavity, 13. Ball head, 14. Drive shaft, 15. Input wrench, 16. Bearing, 17. Splined gear shaft, 18. Output disc, 19. Gear ring, 20. Pinion, 21. Splined hole, 22. Sleeve connecting screw, 23. Base connecting screw, 24. Lower internal screw, 25. Upper internal screw, 26. Splined shaft, 27. Straight cylinder, 28. Linear wrench, 29. Splined shaft II, 30. Straight cylinder connecting screw. Detailed Implementation

[0023] This utility model embodiment provides a high torque wrench, such as Figure 1-6 As shown, it includes a sleeve 1, a connecting screw sleeve 2, and an output device. The output device is connected to the sleeve 1 through the connecting screw sleeve 2.

[0024] like Figure 3As shown, a transmission device for the output device is installed inside the sleeve 1. The transmission device includes an input shaft, an output disk 18, a gear ring 19, and multiple pinions 20. The multiple pinions 20 are concentrically pivotally connected to the output disk 18. The gear ring 19 is fixed inside the sleeve 1. All of the multiple pinions 20 mesh with the gear ring 19. There are at least three pinions 20, which are distributed at equal angles around the center of the output disk 18. The input shaft includes an input wrench 15, a drive shaft 14, and a splined gear shaft 17 connected in sequence. An electric screwdriver is inserted into the input wrench 15. The slot of the input wrench 15 can be a square socket or a hex socket. The drive shaft 14 is pivotally connected to the sleeve 1 via bearings 16. To improve the stability of the drive shaft 14, at least two bearings 16 are provided, distributed on the upper and lower sides of the drive shaft 14. The splined gear shaft 17 is inserted in the middle of a plurality of pinions 20 and meshes with the plurality of pinions 20. The output disk 18 has a splined hole 21 for connecting the output device.

[0025] When the electric screwdriver is input through the input wrench 15, the input speed is transmitted to the spline gear shaft 17, which drives multiple pinions 20 to rotate while simultaneously rotating along the ring gear 19. The multiple pinions 20 drive the output disk 18 to rotate. The input speed of the spline gear shaft 17 is greatly reduced to the output disk 18 through the planetary gear set composed of the multiple pinions 20. While reducing the speed, the torque of the output disk 18 is increased, which reduces the risk of the output device being thrown out instantly and also eliminates the risk of the operator's hand being instantly pulled and rotated.

[0026] like Figure 1 and 5 As shown, the top of the sleeve 1 is provided with a sleeve connecting screw 22, and the upper and lower sections inside the connecting screw sleeve 2 are upper internal screw 25 and lower internal screw 24 with opposite thread directions. The sleeve connecting screw 22 is threadedly connected to the lower internal screw 24.

[0027] The output device can be a right-angle output device or a linear output device.

[0028] In the first embodiment, the output device is a right-angle output device, which includes a base 3, a swing arm 4, an output wrench 5, and an output wheel 6. The bottom of the base 3 is provided with a base connection screw 23 that connects with the upper internal screw 25.

[0029] like Figure 5As shown, the top of the swing arm 4 is rotatably connected to the base 3. The swing arm 4 is similar to a crank and is used for reciprocating left and right swinging. The output wrench 5 is pivotally connected to the base 3 via the output wheel 6. A ratchet ring 7 is provided inside the swing arm 4. A semi-circular plate 8 is rotatably provided on the edge of the output wheel 6. The side of the semi-circular plate 8 is provided with a ratchet part 9 with the tooth direction opposite to that of the ratchet ring 7, and it meshes with the ratchet ring 7. A semi-circular boss is provided on the lower part of the output wheel 6. There is a certain gap between the boss and the semi-circular plate 8. Under normal conditions, the ratchet part 9 meshes with the ratchet ring 7. When the ratchet ring 7 drives the ratchet part 9 to rotate in the meshing direction, one end of the back of the semi-circular plate 8 will press against the boss. The output wheel 6 will rotate synchronously through the semi-circular plate 8. When the ratchet ring 7 drives the ratchet part 9 to rotate in the disengagement direction, one end of the back of the semi-circular plate 8 presses against the boss, and the ratchet part 9 disengages from the ratchet ring 7. At this time, the output wheel 6 does not move.

[0030] An output shaft 10 is axially pivotally connected inside the base 3. An eccentric shaft 11 is eccentrically set at the top of the output shaft 10. The bottom of the swing arm 4 is provided with a movable cavity 12 into which the eccentric shaft 11 can extend. When the eccentric shaft 11 rotates, it drives the swing arm 4 to swing back and forth through the movable cavity 12. Through the unidirectional engagement of the ratchet part 9 and the ratchet ring 7, the output wrench 5 rotates in one direction to achieve transmission.

[0031] To reduce friction between the eccentric shaft 11 and the movable cavity 12, a spherical head 13 is provided at the top of the eccentric shaft 11.

[0032] The bottom end of the output shaft 10 is provided with a splined shaft 26 that can be inserted into the splined hole 21. The output disk 18 is driven to the output shaft 10 through the cooperation of the splined hole 21 and the splined shaft 26.

[0033] In the second embodiment, the output device is a linear output device, which includes a straight cylinder 27, a linear wrench 28, and a splined shaft 29. The linear wrench 28 is pivotally connected to the straight cylinder 27 via a bearing. The linear wrench 28 is coaxially connected to the splined shaft 29 and can be inserted into the splined hole 21. The bottom of the straight cylinder 27 is provided with a straight cylinder connecting screw 30 that can be connected to the upper internal screw 25.

[0034] Choose either a right-angle output device or a linear output device based on the actual usage scenario for greater applicability.

[0035] By setting the spiral directions of the upper internal thread 25 and the lower internal thread 24 to opposite directions, assuming the connecting sleeve 2 is in a vertical state, the tightening direction of the base connecting thread 23 at the bottom of the base 3, the straight connecting thread 30 at the bottom of the straight cylinder 27, and the upper internal thread 25 is counterclockwise (here, the base connecting thread 23 is located above the connecting sleeve 2). Then, the tightening direction of the sleeve connecting thread 22 at the top of the sleeve 1 and the lower internal thread 24 is also counterclockwise (here, the sleeve 1 is located below the connecting sleeve 2; if the vertical positions of the connecting sleeve 2 and the sleeve 1 are reversed, the tightening direction is clockwise). This design ensures that when the electric screwdriver rotates counterclockwise, the sleeve 1 and the connecting sleeve 2 will only tighten and will not loosen. At the same time, since the output wrench 5 also rotates counterclockwise, the connecting sleeve 2 and the connecting thread 23 on the base 3 will also only tighten and will not loosen. This makes it less likely for the adapter to fly off the sleeve 1, reducing the risk.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-torque wrench, characterized in that: The device includes a sleeve (1), a connecting screw sleeve (2), and an output device. The output device is connected to the sleeve (1) through the connecting screw sleeve (2). The sleeve (1) is provided with a transmission device for driving the output device. The transmission device includes an input shaft, an output disk (18), a gear ring (19), and multiple pinions (20). The multiple pinions (20) are circumferentially and concentrically pivoted on the output disk (18). The gear ring (19) is fixed inside the sleeve (1). The multiple pinions (20) mesh with the gear ring (19). The input shaft includes an input wrench (15), a transmission shaft (14), and a spline gear shaft (17) connected in sequence. The transmission shaft (14) is pivotally connected to the sleeve (1) through a bearing (16). The spline gear shaft (17) is inserted in the middle of the multiple pinions (20) and meshes with the multiple pinions (20). The output disk (18) is provided with a spline hole (21) for connecting the output device.

2. A high-torque wrench according to claim 1, characterized in that: The top of the sleeve (1) is provided with a sleeve connecting screw (22). The upper and lower sections inside the connecting screw sleeve (2) are an upper internal screw (25) and a lower internal screw (24) with opposite thread directions. The sleeve connecting screw (22) is threadedly connected to the lower internal screw (24).

3. A high-torque wrench according to claim 2, characterized in that: The output device is a right-angle output device, which includes a base (3), a swing arm (4), an output wrench (5), and an output wheel (6). The bottom of the base (3) is provided with a base connection screw (23) that connects to the upper internal screw (25). The top of the swing arm (4) is rotatably connected to the base (3). The output wrench (5) is pivotally connected to the base (3) through the output wheel (6). A ratchet ring (7) is provided inside the swing arm (4). The output wheel (6) has a rotating ring located at the edge. The base (3) is provided with a semi-circular plate (8), and the side of the semi-circular plate (8) is provided with a ratchet part (9) with the tooth direction opposite to that of the ratchet ring (7), and it meshes with the ratchet ring (7). The base (3) is axially pivotally connected to an output shaft (10), and the top of the output shaft (10) is eccentrically provided with an eccentric shaft (11). The bottom of the swing arm (4) is provided with an active cavity (12) into which the eccentric shaft (11) can be inserted. The bottom end of the output shaft (10) is provided with a spline shaft (26) that can be inserted into a spline hole (21).

4. A high-torque wrench according to claim 2, characterized in that: The output device is a linear output device, which includes a straight cylinder (27), a linear wrench (28), and a second splined shaft (29). The linear wrench (28) is pivotally connected to the straight cylinder (27) through a bearing. The linear wrench (28) is coaxially connected to the second splined shaft (29) and can be inserted into the splined hole (21). The bottom of the straight cylinder (27) is provided with a straight cylinder connecting screw (30) that can be connected to the upper internal screw (25).

5. A high-torque wrench according to claim 1, characterized in that: At least two bearings (16) are provided, with the two bearings (16) distributed on the upper and lower sides of the transmission shaft (14).

6. A high-torque wrench according to claim 1, characterized in that: The number of the pinions (20) is at least three.

7. A high-torque wrench according to claim 3, characterized in that: The top of the eccentric shaft (11) is provided with a spherical head (13).

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