A screwdriver

Abstract

The present invention discloses a screwdriver, comprising a housing, a power device, a gear set and an output shaft arranged in the housing, wherein the power device drives the output shaft to rotate through the gear set; the screwdriver is characterized in that a self-locking component is arranged between the gear set and the output shaft, and an adjusting component is arranged between the self-locking component and the housing; the self-locking component comprises a self-locking disk, a self-locking core, a self-locking needle roller and a self-locking ring; the adjusting component comprises a torque sleeve, a sliding ring, a torque pressure block, a torque spring and a movable gear ring. The screwdriver has the advantages of combining electric and manual operation, adjustable torque during manual operation, simple structure and long service life.

Description

Technical Field

[0001] The invention relates to the technical field of tools, in particular to a screwdriver. Background Art

[0002] A screwdriver is a tool used to turn a screw to force it into place. Electric screwdrivers are also widely used. However, small electric screwdrivers generally have problems such as insufficient power and low torque, which make it impossible to completely tighten the screws into place and require manual tightening. Manual screwdrivers are also too inefficient.

[0003] Therefore, how to improve the existing screwdriver to overcome the above-mentioned shortcomings is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] One object of the present invention is to provide a screwdriver which combines electric and manual operation, has adjustable torque during manual operation, and has a simple structure and a long service life.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: a screwdriver, comprising a housing, and a power device, a gear set and an output shaft arranged in the housing, wherein the power device drives the output shaft to rotate through the gear set; characterized in that a self-locking component is arranged between the gear set and the output shaft, and an adjusting component is arranged between the self-locking component and the housing;

[0006] The self-locking assembly comprises a self-locking disk, a self-locking core, a self-locking needle roller and a self-locking ring, the self-locking disk rotates synchronously with the gear set, a plurality of first limiting posts extend from the circumference of the front end of the self-locking disk, the self-locking core drives the output shaft to rotate synchronously, a support disk is arranged at the rear end of the self-locking core, a plurality of second limiting posts extend from the circumference of the support disk, a locking protrusion is arranged between adjacent second limiting posts, the first limiting post extends axially into the circumference of the support disk and is arranged alternately with the second limiting posts, the self-locking needle roller is movably arranged on the circumference of the support disk and is located between the first limiting post and the second limiting post, and the self-locking ring is rotatably arranged in the housing and is located outside the self-locking disk and the self-locking core;

[0007] The adjustment component includes a torque sleeve, a sliding ring, a torque pressure block, a torque spring and a movable gear ring. The torque sleeve is rotatably arranged outside the housing. The sliding ring, the torque pressure block and the movable gear ring are all axially slidably arranged on the housing. The torque spring is arranged between the torque pressure block and the movable gear ring and forces the movable gear ring to press the self-locking ring to form a torsion resistance force, and the torsion resistance force limits the rotation of the self-locking ring. The torque sleeve is threadedly connected to the sliding ring, and the sliding ring can push the torque pressure block to move axially. The rotation of the torque sleeve is used to adjust the magnitude of the torsion resistance force.

[0008] When the screwdriver is in electric operation, the self-locking disk is active and the self-locking core is driven, and the first limiting column presses the self-locking needle roller in the circumferential direction to contact the second limiting column, so that the self-locking disk drives the self-locking core to rotate without driving the self-locking ring to rotate;

[0009] When the screwdriver is manually operated, the self-locking core is active and the self-locking disk is driven. The locking protrusion preferentially contacts the self-locking needle roller and forces the self-locking needle roller to move radially and press against the self-locking ring. At the same time, the second limiting column presses the self-locking needle roller in the circumferential direction to contact the first limiting column, thereby realizing the synchronous action of the self-locking core, the self-locking disk and the self-locking ring; the anti-torsion force between the self-locking ring and the movable gear ring limits the rotation of the self-locking ring, thereby realizing the fixation of the self-locking core, the self-locking disk and the output shaft, so that the screwdriver has adjustable manual torque.

[0010] Preferably, the second limiting column has a T-shaped cross section, and when the first limiting column presses the self-locking needle roller to contact the second limiting column, the self-locking needle roller is partially embedded in the second limiting column and remains fixed. The above structure makes it more stable when the self-locking disk drives the self-locking core to rotate, and prevents the self-locking needle roller from slipping out and contacting the self-locking ring to affect the normal electric use of the screwdriver.

[0011] As an improvement, the front end of the self-locking ring is provided with a first trapezoidal tooth, and the rear end of the movable gear ring is provided with a second trapezoidal tooth. The movable gear ring meshes with the first trapezoidal tooth and the second trapezoidal tooth to form the anti-torsion force and limit the rotation of the self-locking ring. When the self-locking ring exceeds the maximum torque, the movable gear ring can be lifted up, and the first trapezoidal tooth and the second trapezoidal tooth are disengaged. The anti-torsion force between the self-locking ring and the movable gear ring is increased to meet a sufficiently large manual torque.

[0012] As an improvement, the shell is provided with a gear plate protruding outward, and a plurality of gear slots are opened on the inner side of the torque sleeve. The gear plate can move in and out of the gear slots by deformation, so that the torque sleeve has a gear sense.

[0013] Furthermore, the outer side of the torque sleeve is marked with gear numbers in sequence at the gear slot. The setting of the gear plate, gear slot and gear numbers makes the torque adjustment more quantitative and reduces the difficulty of using the screwdriver.

[0014] Preferably, first sliding ears extend from both sides of the torque pressure block, the first sliding ears pass through the housing and are connected to the sliding ring, and the first sliding ears limit the rotation of the torque pressure block; second sliding ears extend from both sides of the movable gear ring, the second sliding ears are connected to the housing along the axial sliding, and the second sliding ears limit the rotation of the movable gear ring. The above structure is simple and reliable, and is easy to install and maintain.

[0015] As a conventional setting, the screwdriver also includes a switch button, a protection plate and a lithium battery, and the power device is a motor; pressing the switch button can activate the switch on the protection plate, discharge the lithium battery, and then drive the motor to rotate.

[0016] Preferably, the number of the first limiting pillars and the second limiting pillars are three and evenly distributed along the circumferential direction, and the number of the self-locking needle rollers is six. The above arrangement can meet the requirements of structural stability and reliable transmission.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] 1. This solution can automatically realize both electric and manual operation modes through the setting of self-locking components and adjustment components without manual switching. Under normal use, the screws are first tightened to a certain extent by electric means. When the torque of the electric means is not large enough, it cannot be fully tightened; at this time, manual tightening can be adopted. When tightening manually, it is generally adjusted to the corresponding torque gear according to different screws, and then tightened manually.

[0019] 2. In this solution, the self-locking disk, self-locking core, and self-locking needle roller can automatically identify whether the mode is electric or manual according to the master-slave state of the self-locking disk and the self-locking core, thereby automatically realizing whether the output shaft is locked. Moreover, the assembly structure of the self-locking disk, self-locking core, and self-locking needle roller has made a breakthrough, which has the advantages of simple assembly, convenient maintenance, and long service life.

[0020] 3. The adjustment component of this solution can realize the adjustment of the maximum torque in manual mode through a simple structure to be used in different usage environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of a three-dimensional structure according to a preferred embodiment of the present invention;

[0022] Figure 2 is a half-sectional view according to a preferred embodiment of the present invention;

[0023] Figure 3 is a partially enlarged view of a half-section view of a preferred embodiment of the present invention;

[0024] Figure 4 According to a preferred embodiment of the present invention Figure 3 The cross-sectional view along the AA direction;

[0025] Figure 5 is a schematic diagram of the three-dimensional structure of key components according to a preferred embodiment of the present invention;

[0026] Figure 6 According to a preferred embodiment of the present invention Figure 5 A half-section view of

[0027] Figure 7 According to a preferred embodiment of the present invention Figure 6 The cross-sectional view along the BB direction;

[0028] Figure 8 It is a schematic diagram of the explosion state of the self-locking disk, the self-locking core and the self-locking needle roller according to a preferred embodiment of the present invention;

[0029] Fig. 9 It is a schematic diagram of the explosion state of a self-locking ring, a torque pressure block, a torque spring and a movable gear ring according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0031] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.

[0032] like Figures 1 to 9 As shown, it is a preferred embodiment of the present invention, including a housing 1, and a switch button 2, a protection plate 3, a lithium battery 4, a power device 5, a gear set 6 and an output shaft 7 arranged on the housing 1. The power device is a motor. Pressing the switch button 2 can start the switch on the protection plate 3, so that the lithium battery 4 is discharged, and then the motor is driven to rotate. The power device 5 drives the output shaft 7 to rotate through the gear set 6. The key point is that a self-locking component 8 is arranged between the gear set 6 and the output shaft 7, and an adjustment component 9 is arranged between the self-locking component 8 and the housing 1; specifically:

[0033] The self-locking assembly 8 includes a self-locking disk 81, a self-locking core 82, a self-locking needle roller 83 and a self-locking ring 84. The self-locking disk 84 rotates synchronously with the gear set 6. A plurality of first limiting columns 811 extend from the peripheral side of the front end of the self-locking disk 81. The self-locking core 82 drives the output shaft 7 to rotate synchronously. A support disk 821 is provided at the rear end of the self-locking core 82. A plurality of second limiting columns 822 extend from the peripheral side of the support disk 821. A locking protrusion 823 is provided between adjacent second limiting columns 822. The first limiting column 811 extends axially into the peripheral side of the support disk 821 and is arranged alternately with the second limiting columns 822. The self-locking needle roller 83 is movably arranged on the peripheral side of the support disk 821 and is located between the first limiting column 811 and the second limiting column 822. The self-locking ring 84 is rotatably arranged in the housing 1 and is located outside the self-locking disk 81 and the self-locking core 82. There are three first limiting posts 811 and two second limiting posts 822 , each of which is evenly distributed along the circumferential direction, and there are six self-locking needle rollers 83 .

[0034] The adjustment component 9 includes a torque sleeve 91, a sliding ring 92, a torque pressure block 93, a torque spring 94 and a movable gear ring 95. The torque sleeve 91 is rotatably arranged outside the housing 1, and the sliding ring 92, the torque pressure block 93 and the movable gear ring 95 are all axially slidably arranged on the housing 1. The torque spring 94 is arranged between the torque pressure block 93 and the movable gear ring 95, and forces the movable gear ring 95 to press the self-locking ring 84 to form a torsion resistance, and the torsion resistance limits the rotation of the self-locking ring 84; the torque sleeve 91 is threadedly connected to the sliding ring 92, and the sliding ring 92 can push the torque pressure block 93 to move axially. The rotation of the torque sleeve 91 is used to adjust the size of the torsion resistance.

[0035] Here’s how it works:

[0036] When the screwdriver is in electric operation, the self-locking disk 81 is active and the self-locking core 82 is driven, and the first limiting column 811 presses the self-locking needle roller 83 in the circumferential direction to contact the second limiting column 822, so that the self-locking disk 81 drives the self-locking core 82 to rotate without driving the self-locking ring 84 to rotate.

[0037] When the screwdriver is manually operated, the self-locking core 82 is active and the self-locking disk 81 is driven. The locking protrusion 823 preferentially contacts the self-locking needle roller 83 and forces the self-locking needle roller 83 to move radially and press against the self-locking ring 84. At the same time, the second limiting column 822 presses the self-locking needle roller 83 in the circumferential direction to contact the first limiting column 811, thereby realizing the synchronous action of the self-locking core 82, the self-locking disk 81 and the self-locking ring 83; the anti-torsion force between the self-locking ring 83 and the movable gear ring 95 limits the rotation of the self-locking ring 83, thereby realizing the fixation of the self-locking core 82, the self-locking disk 81 together with the output shaft 7, so that the screwdriver has an adjustable manual torque.

[0038] In this embodiment, the cross section of the second limiting column 822 is T-shaped. When the first limiting column 811 presses the self-locking needle roller 83 to contact the second limiting column 822, the self-locking needle roller 83 is partially embedded in the second limiting column 822 and remains fixed.

[0039] The front end of the self-locking ring 84 is provided with a first trapezoidal tooth 841, and the rear end of the movable gear ring 95 is provided with a second trapezoidal tooth 951. The movable gear ring 95 forms a torsion resistance and limits the rotation of the self-locking ring 84 through the meshing of the first trapezoidal tooth 841 and the second trapezoidal tooth 951. When the self-locking ring 84 exceeds the maximum torque, the movable gear ring 95 can be lifted up, and the first trapezoidal tooth 841 and the second trapezoidal tooth 951 are disengaged.

[0040] The housing 1 is provided with a gear plate 10 protruding outward, and a plurality of gear slots 911 are provided inside the torque sleeve 91. The gear plate 10 can enter and exit the gear slots 911 by deformation, so that the torque sleeve 91 has a gear sense. The gear slots 911 on the outside of the torque sleeve 91 are marked with gear numbers 912 in sequence.

[0041] As a limiting structure, first sliding ears 931 extend from both sides of the torque pressure block 93, the first sliding ears 931 pass through the shell 1 and are connected to the sliding ring 92, and the first sliding ears 931 limit the rotation of the torque pressure block 93; second sliding ears 952 extend from both sides of the movable gear ring 95, the second sliding ears 952 are axially slidably connected to the shell 1, and the second sliding ears 952 limit the rotation of the movable gear ring 95.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A screwdriver, comprising a housing, and a power device, a gear set and an output shaft disposed within the housing, wherein the power device drives the output shaft to rotate through the gear set; Characterized in that: A self-locking assembly is disposed between the gear set and the output shaft, and an adjusting assembly is disposed between the self-locking assembly and the housing; The self-locking assembly includes a self-locking disc, a self-locking core, self-locking needle rollers and a self-locking ring. The self-locking disc rotates synchronously with the gear set. A plurality of first limiting posts extend from the circumferential side of the front end of the self-locking disc. The self-locking core drives the output shaft to rotate synchronously. A support disc is disposed at the rear end of the self-locking core. A plurality of second limiting posts extend from the circumferential side of the support disc. Locking protrusions are disposed between adjacent second limiting posts. The first limiting posts axially extend into the circumferential side of the support disc and are arranged staggered with the second limiting posts. The self-locking needle rollers are movably disposed on the circumferential side of the support disc and are located between the first limiting posts and the second limiting posts. The self-locking ring is rotatably disposed within the housing and is located outside the self-locking disc and the self-locking core; The adjusting assembly includes a torque sleeve, a sliding ring, a torque pressing block, a torque spring and a moving gear ring. The torque sleeve is rotatably disposed outside the housing. The sliding ring, the torque pressing block and the moving gear ring are all axially slidably disposed on the housing. The torque spring is disposed between the torque pressing block and the moving gear ring and forces the moving gear ring to press against the self-locking ring to form a torque resistance, and the torque resistance restricts the rotation of the self-locking ring; The torque sleeve is threadedly connected to the sliding ring, and the sliding ring can push the torque pressing block to move axially. Rotating the torque sleeve is used to adjust the magnitude of the torque resistance; When the screwdriver runs electrically, the self-locking disc is the driving part, the self-locking core is the driven part, and the first limiting post presses the self-locking needle roller against the second limiting post in the circumferential direction, so that the self-locking disc drives the self-locking core to rotate without driving the self-locking ring to rotate; When the screwdriver is manually operated, the self-locking core is the driving part, the self-locking disc is the driven part, the locking protrusion preferentially abuts against the self-locking needle roller, and forces the self-locking needle roller to move radially and press against the self-locking ring. At the same time, the second limiting post presses the self-locking needle roller against the first limiting post in the circumferential direction, so as to realize the synchronous movement of the self-locking core, the self-locking disc and the self-locking ring; The torque resistance between the self-locking ring and the moving gear ring restricts the rotation of the self-locking ring, thereby realizing the fixation of the self-locking core, the self-locking disc together with the output shaft, so that the screwdriver has an adjustable manual torque.

2. A screwdriver according to claim 1, Characterized in that: The cross section of the second limiting post is T-shaped. When the first limiting post presses the self-locking needle roller against the second limiting post, part of the self-locking needle roller is embedded in the second limiting post and remains fixed.

3. A screwdriver according to claim 1, Characterized in that: The front end of the self-locking ring is provided with a first trapezoidal tooth, and the rear end of the movable gear ring is provided with a second trapezoidal tooth. The movable gear ring forms the anti-torque force and limits the rotation of the self-locking ring through the meshing of the first trapezoidal tooth and the second trapezoidal tooth. When the self-locking ring exceeds the maximum torque, the movable gear ring can be lifted up, and the first trapezoidal tooth and the second trapezoidal tooth are disengaged.

4. A screwdriver according to claim 1, Features: The shell is provided with a gear plate protruding outward, and a plurality of gear slots are opened inside the torque sleeve. The gear plate can move in and out of the gear slots by deformation, so that the torque sleeve has a gear sense.

5. A screwdriver according to claim 4, Features: The outer side of the torque sleeve is sequentially marked with gear numbers at the gear slot.

6. A screwdriver according to claim 1, Features: First sliding ears extend from both sides of the torque pressure block, the first sliding ears pass through the shell and are connected to the sliding ring, and the first sliding ears limit the rotation of the torque pressure block; second sliding ears extend from both sides of the movable gear ring, the second sliding ears are axially slidably connected to the shell, and the second sliding ears limit the rotation of the movable gear ring.

7. A screwdriver according to claim 1, Features: The screwdriver also includes a switch button, a protection plate and a lithium battery, and the power device is a motor; pressing the switch button can start the switch on the protection plate, discharge the lithium battery, and then drive the motor to rotate.

8. A screwdriver according to any one of claims 1 to 7, Features: There are three of each of the first limiting posts and the second limiting posts, which are evenly distributed along the circumferential direction, and there are six of the self-locking needle rollers.

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