High-torsion transmission screw and driving tool thereof

Abstract

The invention discloses a high-torsion transmission screw and a driving tool thereof. The high-torsion transmission screw comprises a screw head and a screw rod, the screw head comprises a driving protruding block. The driving bump comprises four driving wall parts which are annularly arranged at equal angles and are mutually spaced, and four guide wall parts which respectively extend straightly and are connected with the driving wall parts. The ratio of the longest distance between any two non-adjacent driving wall parts to the longest distance between any two adjacent driving wall parts is larger than 1.16. Each driving wall part is provided with a cambered surface section and two straight surface sections, wherein the two straight surface sections extend inwards from the two opposite ends of the cambered surface section respectively and are connected with the two guide wall parts. The central angle of the cambered surface section is smaller than 180 degrees. Through the design of the ratio, the situation that the driving tool or the wrench slips when locking the screw can be greatly reduced.

Description

Technical Field

[0001] The invention relates to a screw and a tool for driving the screw, and in particular to a high torque transmission screw and a driving tool thereof. Background Art

[0002] A common hexagonal flange head screw has a hexagonal protrusion on a disc-shaped abutment seat, and the protrusion can be mounted and driven by a driving tool or a wrench with a hexagonal hole. However, the hexagonal profile of the protrusion has many sharp edges, which are easily worn out during the force locking process, causing the end edge and end face of the protrusion to gradually become arc-shaped, and the force-bearing area is continuously reduced, which eventually leads to a decrease in the transmitted torque, and in severe cases, it can also cause the driving tool or wrench to slip when driving the hexagonal flange head screw. Summary of the invention

[0003] The object of the present invention is to provide a screw which can reduce wear and tear and is not easy to slip off.

[0004] The high torque transmission screw of the present invention comprises: a screw head, and a screw rod connected to the screw head and forming at least one thread, the screw head comprises a driving protrusion, the driving protrusion comprises four driving wall portions which are arranged in an annular shape at equal angles and spaced from each other, and four guide wall portions which extend straightly and connect the driving wall portions, the ratio of the longest distance between any two non-adjacent driving wall portions to the longest distance between any two adjacent driving wall portions is greater than 1.16, each driving wall portion comprises an arc surface segment, and two straight surface segments which extend inward from opposite ends of the arc surface segment and connect two of the guide wall portions, and the central angle of the arc surface segment is less than 180 degrees.

[0005] Preferably, in the aforementioned high torque transmission screw, the radius of curvature of the arc surface segment of each driving wall portion is greater than the length of each straight surface segment.

[0006] Preferably, in the aforementioned high torque transmission screw, the driving protrusion of the screw head is recessed downward from the top surface to form a pinhole.

[0007] Preferably, in the aforementioned high torque transmission screw, the pinhole is one of a hexagonal hole, a plum blossom hole, a cross hole, a Pozidriv hole, a square hole, or a square cross hole.

[0008] Preferably, in the aforementioned high torque transmission screw, the screw head further comprises a support seat on the top surface for the driving protrusion to be convexly provided and the bottom surface of which is connected to the screw rod.

[0009] Another object of the present invention is to provide a driving tool capable of driving the aforementioned screw.

[0010] The driving tool of the present invention is used to drive the high torque transmission screw as described above, and the driving tool includes a body, the body includes four driving wall portions which are arranged in an annular shape at equal angles and spaced from each other, and four guide wall portions which extend straightly and connect the corresponding driving wall portions, the driving wall portions and the guide wall portions of the body cooperate to define a driving groove, the ratio of the longest distance between any two non-adjacent driving wall portions of the body to the longest distance between any two adjacent driving wall portions is greater than 1.16, each driving wall portion of the body has an arc surface segment, and two straight surface segments which extend inward from opposite ends of the corresponding arc surface segment and connect the corresponding two guide wall portions, and the central angle of the arc surface segment of the body is less than 180 degrees.

[0011] Preferably, in the aforementioned driving tool, the radius of curvature of the arc surface segment of each driving wall portion of the body is greater than the length of each straight surface segment.

[0012] The beneficial effect of the present invention is that the ratio of the longest distance between any two non-adjacent driving wall portions of the screw to the longest distance between any two adjacent driving wall portions is greater than 1.16, which is greater than the maximum ratio of the diagonal angle to the opposite side of a regular hexagon, 1.1547, thereby greatly reducing the slippage of the driving tool or wrench when locking the screw. The design of the arc surface segment can greatly reduce the wear during locking to maintain good transmission torque. The straight surface segment can effectively increase the contact area between the screw and the driving tool, improve the meshing degree and stability of the two during the locking process, and eliminate the loss of transmission torque caused by the decrease in meshing degree due to process tolerance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a perspective view illustrating an embodiment of a high torque transmission screw of the present invention;

[0014] Figure 2 is a top view illustrating the screw head of the embodiment;

[0015] Figure 3 is a top view illustrating the driving protrusion of the screw head;

[0016] Figure 4 and Figure 5 All are three-dimensional diagrams, illustrating different aspects of the embodiments;

[0017] Figures 6 to 11 All are top views, illustrating different types of pinholes provided in the embodiments;

[0018] Fig.12 is a schematic diagram illustrating the correspondence between the pinhole and a general screwdriver head;

[0019] Fig.13 is a perspective view illustrating the high torque transmission screw and the driving tool;

[0020] Fig.14 is a top view illustrating a drive slot of the drive tool; and

[0021] Fig.15 It is a three-dimensional diagram; it illustrates the use of a common wrench to tighten the high torque transmission screw. DETAILED DESCRIPTION

[0022] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0023] See also Figure 1 , Figure 2 ,and Figure 3 , an embodiment of the high torque transmission screw 1 of the present invention comprises a screw head 11 and a screw rod 12 extending downward from the screw head 11. The screw head 11 comprises a disc-shaped abutment seat 111 and a driving protrusion 112 protruding from the top surface of the abutment seat 111. The driving protrusion 112 comprises four driving wall portions 113 arranged in an annular shape at equal angles and spaced from each other, and four guide wall portions 114 extending straightly and connecting the driving wall portions 113. The ratio of the longest distance B between any two non-adjacent driving wall portions 113 to the longest distance A between any two adjacent driving wall portions 113 is greater than 1.16 (i.e., B / A>1.16). Each driving wall portion 113 has an arc segment 115 and two straight segments 116 extending inwardly from opposite ends of the arc segment 115 and connecting two of the guide wall portions 114. The radius of curvature C of the arc segment 115 is greater than the length D of each straight segment 116. The central angle of the arc segment 115 is less than 180 degrees, so the arc length of the arc segment 115 is less than the arc length of a semicircle with the same radius. The screw 12 is connected to the bottom surface of the abutment seat 111, and forms a spirally extending thread 121, and a tail 122 formed at the end of the thread 121. In addition to being in the shape of a disc, the abutment seat 111 can also be in other shapes according to needs, and even the screw head 11 does not need to have the abutment seat 111, so that the driving protrusion 112 is directly connected to the top of the screw 12.

[0024] See also Figure 1 , Figure 4 ,and Figure 5 The tail portion 122 at the end of the screw rod 12 can be Figure 1 The following is a drill tail design. You can also choose the following according to the actual locking requirements: Figure 4 The pointed tail design shown, or Figure 5 The horizontal tail design shown is designed to meet different locking requirements. Figures 6 to 11 , and cooperate with Fig.12The driving protrusion 112 can be recessed downward from the top surface to form a pinhole 117. The pinhole 117 can be as required. Figures 6 to 11 The pinhole 117 is one of a hexagonal hole, a plum blossom hole, a cross hole, a Pozidriv hole, a square hole, or a square cross hole. The pinhole 117 can be inserted into various screwdriver bits, such as Fig.12 As shown, the present embodiment can be driven by various common screwdriver bits E, thereby improving its versatility.

[0025] See also Fig.13 and Fig.14 , an embodiment of the driving tool 2 of the present invention comprises a body 21. The body 21 comprises four driving wall portions 211 arranged in an equiangular ring and spaced from each other, and four guide wall portions 212 extending straightly and connecting the driving wall portions 211. The driving wall portions 211 and the guide wall portions 212 cooperate to define a driving groove 213. The ratio of the longest distance between any two non-adjacent driving wall portions 211 to the longest distance between any two adjacent driving wall portions 211 is greater than 1.16. Each driving wall portion 211 has an arc segment 214, and two straight segments 215 extending inward from opposite ends of the arc segment 214 and connecting two of the guide wall portions 212. The radius of curvature of the arc segment 214 is greater than the length of each straight segment 215. The central angle of the arc segment 214 is less than 180 degrees, so the arc length of the arc segment 214 is less than the arc length of a semicircle with the same radius.

[0026] See also Figure 2 , Fig.13 ,and Fig.15 The driving groove 213 of the driving tool 2 can be sleeved on the driving protrusion 112 with corresponding shapes. Fig.15 As shown, a wrench F is used to clamp the driving protrusion 112. By designing the ratio greater than 1.16, which is greater than the ratio of the diagonal angle to the opposite side of a regular hexagon, which is 1.1547, the driving tool 2 or the wrench F can be greatly reduced from slipping when locking the high torque transmission screw 1. According to experiments, when locking a conventional hexagonal flange head screw with an outer diameter of M10, a general wrench will slip when a force of about 54 to 55 Nm is applied, while the high torque transmission screw 1 of the present invention with an outer diameter of M10 will not slip even when the force applied reaches the maximum breaking torque value of 88 Nm, which shows its anti-slip effect.

[0027] See also Figure 2 , Fig.13 ,and Fig.14In addition, the arc-shaped profile of the arc surface segment 115 of the driving wall portion 113 of the driving protrusion 112 of the screw head 11 and the arc surface segment 214 of the driving wall portion 211 of the body 21 can avoid wear between the high torque transmission screw 1 and the driving tool 2 during locking, thereby maintaining good transmission torque. The straight surface segment 116 of the driving wall portion 113 of the driving protrusion 112 of the screw head 11 and the straight surface segment 215 of the driving wall portion 211 of the body 21 can increase the contact area between the high torque transmission screw 1 and the driving tool 2, thereby increasing the meshing degree and stability of the two during the locking process, thereby eliminating the loss of transmission torque caused by the decrease in meshing degree due to process tolerance. At the same time, the design of the straight surface segment 116 of the high torque transmission screw 1 can also make it easier to demold the driving protrusion 112 during molding, reduce the risk of mold damage and molding difficulty, and thus extend the service life of the mold.

[0028] In summary, the present invention is not easy to slip and can avoid wear. In narrow spaces or close to the ground where it is difficult to use an electric tool gun for locking, a wrench can be used instead for locking. The locking difficulty is low and good transmission torque and locking stability can be maintained. At the same time, the tail 122 at the end of the screw rod 12 can adopt different designs according to needs to correspond to different workpieces that need to be locked, and the driving protrusion 112 can also be provided with pinholes 117 with different hole shapes for the screwdriver head E to be inserted and driven, thereby improving the overall versatility, so the purpose of the present invention can be achieved.

[0029] The above description is only a preferred embodiment of the present invention, but it is not intended to limit the scope of the present invention. Any person familiar with this technology can make further improvements and changes on this basis without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims of this application.

Claims

1. A high torque transmission screw, characterized in that: The high torque transmission screw includes a screw head and a screw rod connected to the screw head and forming at least one thread, the screw head includes a driving protrusion, the driving protrusion includes four driving wall portions arranged in an equiangular ring and spaced from each other, and four guide wall portions each extending straight and connecting the driving wall portions, the ratio of the longest distance between any two non-adjacent driving wall portions to the longest distance between any two adjacent driving wall portions is greater than 1.16, each driving wall portion has an arc surface segment, and two straight surface segments extending inward from opposite ends of the arc surface segment and connecting two of the guide wall portions, and the central angle of the arc surface segment is less than 180 degrees.

2. The high torque transmission screw according to claim 1, characterized in that: The radius of curvature of the arc surface segment of each driving wall portion is greater than the length of each straight surface segment.

3. The high torque transmission screw according to claim 1, characterized in that: The driving protrusion of the screw head is recessed downward from the top surface to form a pinhole.

4. The high torque transmission screw according to claim 3, characterized in that: The pinhole is one of a hexagonal hole, a plum blossom hole, a cross hole, a pound hole, a square hole, or a square cross hole.

5. The high torque transmission screw according to claim 1, characterized in that: The screw head also includes a top surface for the driving protrusion to be convexly arranged and a bottom surface connected to a support seat of the screw rod.

6. A driving tool; used to drive the high torque transmission screw according to claim 1, characterized in that: The driving tool includes a main body, which includes four driving wall portions arranged in an equiangular ring and spaced from each other, and four guide wall portions each extending straight and connected to the corresponding driving wall portions. The driving wall portions and the guide wall portions of the main body cooperate to define a driving groove. The ratio of the longest distance between any two non-adjacent driving wall portions of the main body to the longest distance between any two adjacent driving wall portions is greater than 1.

16. Each driving wall portion of the main body has an arc surface segment, and two straight surface segments extending inward from opposite ends of the corresponding arc surface segment and connecting the corresponding two guide wall portions. The central angle of the arc surface segment of the main body is less than 180 degrees.

7. The driving tool according to claim 6, characterized in that: The curvature radius of the arc surface segment of each driving wall portion of the body is greater than the length of each straight surface segment.

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