Z-shaped attachment component for electric screwdriver

Abstract

The utility model belongs to the technical field of electric screwdriver attachment parts, and relates to a Z-shaped attachment part for an electric screwdriver, which comprises a screwdriver head, an extension shell and a screwdriver head clamping mechanism, a gear transmission mechanism is arranged in the extension shell, the gear transmission mechanism comprises three gears meshed in sequence, the extension shell is divided into a left part and a right part, the left part is of a triangular prism structure, three side faces are vertical faces, one side face is parallel to the front-back direction, the other two side faces are located on the left side of the side face, and the bit clamping mechanism is connected with the left part; according to the gear transmission mechanism, the design of the small gear, the large gear and the small gear is adopted, and due to the fact that the number of the adopted gears is smaller than that of gears of a traditional attached part, the problem that the CPK value of torsion of an electric screwdriver is too low, namely the dispersity of the precision value of locking torsion is too large due to the fact that the number of the gears is large can be effectively solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric screwdriver attachment components and relates to a Z-shaped attachment component used for an electric screwdriver. Background Art

[0002] The attachment parts of power screwdrivers (electric screwdrivers), especially the Z-type attachment parts, are often used in narrow recessed spaces that are difficult to reach with ordinary upright power screwdrivers, such as the recessed areas of the workpiece to be locked; since the screw holes to be locked in these areas are difficult to approach directly, we use the unique extension design of the attachment parts to complete the screw locking operation; this extension part, because its shape resembles the letter Z, is called the Z-type attachment part.

[0003] Most Z-type attachments use a multi-gear design. These gears are arranged in an elongated housing, and the rotational power is smoothly transmitted from the input end to the output end through the close meshing of teeth. However, the multi-gear design still faces challenges in improving the torque CPK value of handheld power screwdrivers. The CPK value is the process capability index of the locking torque, which directly reflects the stability and consistency of the torque accuracy. The CPK value of the 5-gear design in the existing technology generally hovers around 1.5, or even lower, and shows great instability, making it difficult to meet the needs of high-precision locking operations.

[0004] In addition, the shapes and sizes of the on-site locking spaces vary, and the current Z-shaped attachment components are difficult to adapt to different locking spaces.

[0005] Therefore, it is of great significance to study a Z-shaped attachment component for an electric screwdriver to solve the problems existing in the prior art. Utility Model Content

[0006] The utility model aims to solve the problems existing in the prior art and provide a Z-shaped attachment component for an electric screwdriver.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0008] A Z-shaped attachment component for an electric screwdriver comprises an extension housing, a screwdriver bit and a screwdriver bit clamping mechanism. A gear transmission mechanism is arranged inside the extension housing. The gear transmission mechanism comprises three gears meshing in sequence. The number of gears used is smaller, which effectively reduces torque error and improves the problem of too low torque CPK value of the electric screwdriver. The extension housing is divided into a left part and a right part.

[0009] The left part is a triangular prism structure, and the three sides are vertical planes, one of which is parallel to the front-back direction, and the other two sides are located on the left side of the side, so that it can be better suitable for the concave locking space on the workpiece;

[0010] The bit holding mechanism is connected to the left part.

[0011] As the preferred technical solution:

[0012] A Z-shaped attachment component for an electric screwdriver as described above, wherein the extension housing comprises an upper cover, a middle cover and a lower cover which are fixedly connected in sequence from top to bottom;

[0013] The gear transmission mechanism is located inside the upper cover and the middle cover.

[0014] As described above, a Z-shaped attachment component for an electric screwdriver, the upper cover, the middle cover and the lower cover are all made of alloy tool steel Cr12MoV, the alloy tool steel Cr12MoV has a yield strength ≥1750MPa, a tensile strength ≥2000MPa, an elongation ≥4%, a Rockwell hardness of 58-62, and has good wear resistance and strength.

[0015] A Z-type attachment component for an electric screwdriver as described above, wherein the three gears are a small gear a, a large gear and a small gear b;

[0016] The small gear a meshes with the large gear, and the large gear meshes with the small gear b;

[0017] Pinion a is the driving wheel.

[0018] As described above, in a Z-type attachment component for an electric screwdriver, the diameters of the pinion a and the pinion b are both 3.45 mm, and the diameter of the large gear is 19.8 mm.

[0019] A Z-shaped attachment component for an electric screwdriver as described above, wherein the gear transmission mechanism further comprises a shaft I, a shaft II and a shaft III;

[0020] The shaft rods I, II and III are vertically arranged between the upper cover and the middle cover;

[0021] The small gear a is fixedly sleeved on the shaft rod I, the large gear is fixedly sleeved on the shaft rod II, and the small gear b is fixedly sleeved on the shaft rod III;

[0022] The middle part of the shaft rod I, the upper end of the shaft rod II, and the upper end of the shaft rod III are all rotatably connected to the upper cover, and the lower end of the shaft rod I, the lower end of the shaft rod II, and the lower end of the shaft rod III are all rotatably connected to the middle cover;

[0023] The upper end of the shaft rod I is located above the upper cover and is used to connect with the screwdriver head locking mechanism of the electric screwdriver;

[0024] The lower end of the shaft rod III is also fixedly connected to the screwdriver bit.

[0025] A Z-type attachment component for an electric screwdriver as described above, wherein the gear transmission mechanism further comprises an upper bearing group and a lower bearing group;

[0026] The upper bearing group is located in the upper cover, including bearing a, bearing b and bearing c;

[0027] The lower bearing group is located in the middle cover, including bearing d, bearing e and bearing f;

[0028] The middle part of the shaft rod I is rotatably connected to the upper cover through a bearing a, and the lower end of the shaft rod I is rotatably connected to the middle cover through a bearing d;

[0029] The upper end of the shaft II is rotatably connected to the upper cover via a bearing b, and the lower end of the shaft II is rotatably connected to the middle cover via a bearing e;

[0030] The upper end of the shaft III is rotatably connected to the upper cover via a bearing c, and the lower end of the shaft III is rotatably connected to the middle cover via a bearing f;

[0031] The upper bearing group and the lower bearing group are used to support each shaft rod, which rotates smoothly and reduces friction loss.

[0032] A Z-type attachment component for an electric screwdriver as described above, wherein the bit clamping mechanism comprises a clamping bearing assembly;

[0033] The clamped bearing set includes 4 bearings g;

[0034] The 4 bearings g are located under the middle cover;

[0035] The four bearings g are put on the bit in sequence from top to bottom to keep the bit stable.

[0036] A Z-type attachment component for an electric screwdriver as described above, further comprising a positioning rod;

[0037] The positioning rod is vertically arranged inside the extension shell, and the upper end thereof passes through the extension shell.

[0038] Beneficial effects:

[0039] (1) The utility model is a Z-shaped attachment component for an electric screwdriver. The gear transmission mechanism adopts a small-large-small three-gear design. Since the gears used are fewer than those of traditional attachment components, the problem of too low torque CPK value of the electric screwdriver caused by a large number of gears, that is, too large dispersion of the locking torque accuracy value, can be effectively reduced;

[0040] (2) The utility model provides a Z-shaped attachment component for an electric screwdriver, the left end of which is "V"-shaped, which can be better adapted to the concave locking space on the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the connection between the Z-shaped attachment component and the electric screwdriver of the utility model;

[0042] Figure 2It is a top view of a Z-shaped attachment component for an electric screwdriver of the utility model;

[0043] Figure 3 and Figure 4 It is a cross-sectional view of a Z-shaped attachment component for an electric screwdriver according to the utility model;

[0044] Figure 5 This is a gear arrangement diagram of a Z-shaped attachment component for an electric screwdriver of the utility model;

[0045] Figure 6 This is a physical diagram of the Z-shaped attachment component of the utility model (only part of the structure is shown in the figure);

[0046] Figure 7 This is a diagram showing the cooperation between the left end of the Z-shaped attachment component of the present invention and the workpiece;

[0047] Among them, 10-workpiece, 11-Z-type attachment component, 111-extension housing, 112-gear transmission mechanism, 1111-upper cover, 1112-middle cover, 1113-lower cover, 1121-bearing a, 1122-bearing b, 1123-bearing c, 1124-small gear a, 1125-large gear, 1126-small gear b, 1127-bearing d, 1128-bearing e, 1129-bearing f, 1130-shaft rod I, 1131-batch head, 1132-clamping bearing group, 12-right part, 13-left part, 14-positioning rod. DETAILED DESCRIPTION

[0048] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

[0049] A Z-type attachment component for an electric screwdriver, such as Figures 1 to 6 As shown, the Z-type attachment component 11 includes an extension housing 11, a screwdriver bit 1131, a screwdriver bit clamping mechanism, a gear transmission mechanism 112 and a positioning rod 14;

[0050] like Figure 4 As shown, the extension shell 11 includes an upper cover 1111, a middle cover 1112 and a lower cover 1113 which are fixedly connected in sequence from top to bottom; the upper cover 1111, the middle cover 1112 and the lower cover 1113 are all made of alloy tool steel Cr12MoV;

[0051] like Figure 2As shown, the extended housing 11 is divided into a right part 12 and a left part 13, and the dotted line in the figure represents the dividing line between the right part 12 and the left part 13. The left part 13 is a triangular prism structure, and the three side surfaces are all vertical surfaces, one of the side surfaces is parallel to the front-back direction, and the other two side surfaces are located on the left side of the side surface;

[0052] like Figures 3 to 5 As shown, the gear transmission mechanism 112 includes a shaft I 1130, a shaft II, a shaft III, an upper bearing group, a lower bearing group, a small gear a 1124, a large gear 1125 and a small gear b 1126;

[0053] The diameters of the pinion a 1124 and the pinion b 1126 are both 3.45 mm, and the diameter of the large gear 1125 is 19.8 mm;

[0054] like Figure 4 As shown, the upper bearing group is located in the upper cover 1111, including bearing a 1121, bearing b 1122 and bearing c 1123;

[0055] The lower bearing assembly is located in the middle cover 1112 and includes a bearing d 1127, a bearing e 1128 and a bearing f 1129;

[0056] The shaft I 1130, shaft II and shaft III are arranged vertically;

[0057] The upper end of the shaft rod I 1130 is located above the upper cover 1111 and is used to connect with the screwdriver head locking mechanism of the electric screwdriver. The middle part of the shaft rod I 1130 is rotatably connected with the upper cover through the bearing a 1121, and the lower end of the shaft rod I 1130 is rotatably connected with the middle cover through the bearing d 1127.

[0058] The upper end of the shaft II is rotatably connected to the upper cover via a bearing b 1122, and the lower end of the shaft II is rotatably connected to the middle cover via a bearing e 1128;

[0059] The upper end of the shaft III is rotatably connected to the upper cover via the bearing c 1123, and the lower end of the shaft III is rotatably connected to the middle cover via the bearing f 1129; the lower end of the shaft III is also fixedly connected to the screwdriver bit 1131;

[0060] like Figure 5 As shown, the pinion a 1124 is fixedly sleeved on the shaft I 1130, the large gear 1125 is fixedly sleeved on the shaft II, and the pinion b 1126 is fixedly sleeved on the shaft III; the pinion a 1124 is meshed with the large gear 1125, and the large gear 1125 is meshed with the pinion b 1126;

[0061] The bit holding mechanism is connected to the left part 13;

[0062] like Figure 4 and Figure 5 As shown, the bit clamping mechanism includes a clamping bearing group 1132, and the clamping bearing group 1132 includes 4 bearings g;

[0063] The four bearings g are located below the middle cover 1112 and are sequentially mounted on the screwdriver bit 1131 from top to bottom;

[0064] There are three positioning rods 14 in total, which are vertically arranged inside the extension housing 11 , and the upper ends thereof pass through the extension housing 11 .

[0065] Specific use process: Figure 1 , Figure 7 As shown, after the Z-type attachment component 11 is connected to the bit locking mechanism of the electric screwdriver, the Z-type attachment component 11 is placed in the corresponding workpiece groove, the electric screwdriver is started, and the motor of the electric screwdriver outputs torque, which is input through the small gear a1124 and transmitted to the small gear b1126 through the large gear 1125. The small gear b1126 drives the shaft III to rotate, the shaft III drives the bit 1131 to rotate, and the bit 1131 drives the screw to be locked to rotate to complete the locking.

Claims

1. A Z-shaped attachment component for an electric screwdriver, comprising an extension housing (11), a screwdriver bit (1131) and a screwdriver bit clamping mechanism, wherein a gear transmission mechanism (112) is arranged inside the extension housing (11), characterized in that: The gear transmission mechanism (112) includes three gears meshing in sequence, and the extension housing (11) is divided into a left part (13) and a right part (12); The left part (13) is a triangular prism structure, and the three side surfaces are all vertical surfaces, one of the side surfaces is parallel to the front-back direction, and the other two side surfaces are located on the left side of the side surface; The bit clamping mechanism is connected to the left part (13).

2. A Z-shaped attachment component for an electric screwdriver according to claim 1, characterized in that: The extension shell (11) comprises an upper cover (1111), a middle cover (1112) and a lower cover (1113) which are fixedly connected in sequence from top to bottom; The gear transmission mechanism (112) is located inside the upper cover (1111) and the middle cover (1112).

3. A Z-shaped attachment component for an electric screwdriver according to claim 2, characterized in that: The three gears are small gear a (1124), large gear (1125) and small gear b (1126); The small gear a (1124) meshes with the large gear (1125), and the large gear (1125) meshes with the small gear b (1126); Pinion a (1124) is the driving wheel.

4. A Z-shaped attachment component for an electric screwdriver according to claim 3, characterized in that: The diameters of the small gear a (1124) and the small gear b (1126) are both 3.45 mm, and the diameter of the large gear (1125) is 19.8 mm.

5. A Z-shaped attachment component for an electric screwdriver according to claim 3, characterized in that: The gear transmission mechanism (112) further includes a shaft I (1130), a shaft II, and a shaft III; The shaft I (1130), the shaft II and the shaft III are vertically arranged between the upper cover (1111) and the middle cover (1112); The small gear a (1124) is fixedly sleeved on the shaft rod I (1130), the large gear (1125) is fixedly sleeved on the shaft rod II, and the small gear b (1126) is fixedly sleeved on the shaft rod III; The middle part of the shaft rod I (1130), the upper end of the shaft rod II, and the upper end of the shaft rod III are all rotatably connected to the upper cover (1111), and the lower end of the shaft rod I (1130), the lower end of the shaft rod II, and the lower end of the shaft rod III are all rotatably connected to the middle cover (1112); The upper end of the shaft rod I (1130) is located above the upper cover (1111) and is used to connect with the screwdriver bit locking mechanism of the electric screwdriver; The lower end of the shaft III is also fixedly connected to the screwdriver bit (1131).

6. A Z-shaped attachment component for an electric screwdriver according to claim 5, characterized in that: The gear transmission mechanism (112) further includes an upper bearing group and a lower bearing group; The upper bearing assembly is located in the upper cover (1111), and includes a bearing a (1121), a bearing b (1122) and a bearing c (1123); The lower bearing assembly is located in the middle cover (1112), and includes a bearing d (1127), a bearing e (1128) and a bearing f (1129); The middle part of the shaft rod I (1130) is rotatably connected to the upper cover via a bearing a (1121), and the lower end of the shaft rod I (1130) is rotatably connected to the middle cover via a bearing d (1127); The upper end of the shaft II is rotatably connected to the upper cover via a bearing b (1122), and the lower end of the shaft II is rotatably connected to the middle cover via a bearing e (1128); The upper end of the shaft rod III is rotatably connected to the upper cover via a bearing c (1123), and the lower end of the shaft rod III is rotatably connected to the middle cover via a bearing f (1129).

7. A Z-shaped attachment component for an electric screwdriver according to claim 2, characterized in that: The screwdriver bit clamping mechanism comprises a clamping bearing group (1132); the clamping bearing group (1132) comprises four bearings g; the four bearings g are located below the middle cover (1112); and the four bearings g are sequentially sleeved on the screwdriver bit (1131) from top to bottom.

8. A Z-shaped attachment component for an electric screwdriver according to claim 1, characterized in that: Also includes a positioning rod (14); The positioning rod (14) is vertically arranged inside the extension shell (11), and the upper end thereof passes through the extension shell (11).

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