TWI786004B - Torque adjustment structure of torque wrench - Google Patents

Abstract

A torque adjustment structure of a torque wrench, the torque wrench includes a pipe body, one end of the pipe body is connected with a working unit, the other end of the pipe body is provided with a torque adjustment structure; the inside of the pipe body is provided with a tripping unit and A preload spring; the torsion adjustment structure adjusts the preload that the preload spring exerts on the tripping unit to press the working unit, so as to adjust the torque of the torque wrench; the torsion adjustment structure includes: set in the pipe body A push cylinder used to push the pre-compressed spring, a rotary follower is sleeved outside the push cylinder; a rotary active part is sleeved outside the rotary follower; the rotary active part is manually rotated , the rotating active part drives the rotating driven part to rotate, causing the push cylinder to move linearly, thereby pushing or relaxing the preload spring, thereby adjusting the torque value of the torque wrench.

Description

Torque adjustment structure of torque wrench

The present invention relates to hand tools, more specifically, to a torque adjustment structure of a torque wrench.

The torque wrench has the function of setting the torque. When the applied force of the wrench to turn the bolt or nut exceeds the set torque value, a jumping structure in the wrench will produce a jumping action, which will then generate vibration and sound, and the user knows that the applied force of the wrench has reached the set value value.

In order to make the torsion adjustment more accurate, this creation proposes a torsion adjustment structure.

The first technical feature of the present invention: a torque adjustment structure of a torque wrench, the torque wrench includes a pipe body, one end of the pipe body is connected with a working unit, and the other end of the pipe body is provided with a torque adjustment structure; A trip unit and a preload spring are arranged inside; the torque adjustment structure adjusts the preload that the preload spring exerts on the trip unit to press the working unit, so as to adjust the torque of the torque wrench; the torque adjustment structure includes : a push cylinder arranged in the pipe body to push the preload spring, a rotary follower is sleeved outside the push cylinder; a rotary active part is sleeved outside the rotary follower; Manually rotate the rotating active part, the rotating active part drives the rotating driven part to rotate, and the push cylinder linearly moves, thereby pushing or relaxing the preload spring, thereby increasing or decreasing the torque value of the torque wrench.

By virtue of the above-mentioned first technical feature, manually rotating the rotating active part, the rotating active part The rotary follower is driven to rotate, and the push cylinder linearly moves along the thread line. The forward linear movement of the push cylinder pushes the preload spring and increases the torque value of the wrench. Conversely, the backward linear movement of the push cylinder can relax the preload spring and reduce the torque value of the wrench.

The second technical feature of the present invention further includes a correction push shaft, including a socket part and a push contact part, both of which are connected with the center of the shaft; the socket part is arranged in the cylindrical shaft, and is attached to the inner stop surface ; the push contact portion is extended in the tubular shaft; the end of the preloaded spring is sleeved in the sleeve portion; a fine-tuning piece is set in the tubular shaft, and the fine-tuning piece is threadedly connected with the tubular shaft, The fine-adjustment part pushes the push-contact part; the end of the fine-adjustment part different from the push-contact part is provided with a tool hole.

With the above-mentioned second technical feature, a screwdriver is combined with the tool hole of the trimmer. Rotating the screwdriver drives the fine adjustment part to rotate, and the fine adjustment part moves linearly along the screw thread. The forward linear movement of the fine-tuning part pushes the correction push shaft to make it slightly move forward to push the preload spring, and the fine-tuning increases the torque value of the wrench. Conversely, the linear movement of the fine-tuning member can relax the preload spring, and the fine-tuning reduces the torque value of the wrench. The torque value is measured by the torque meter, and the torque correction is reset to zero.

10: tube body

11: Inner shaft sleeve

12: Windows

13: Scale

20: Work unit

21: Tool head

22: Shaft

23: Pivot element

24: escape unit

25: Top piece

26: first groove

27: Second groove

28: Jump Block

30: Preloaded spring

40: Torque adjustment structure

41: push cylinder

42: Cylindrical shaft

43: Chute

46: Inner stop surface

50: Calibration push shaft

51: Socket

52: push contact part

53: Correction component

54: push contact

55: Ball

56: Trimmer

57: Tool hole

60:Rotary follower

61: ring head

62: connecting shaft

63: step

64: Buckle groove

65: C-type buckle

66: positioning ring

67: bead groove

70: Rotate the active part

71: Polygon shaft hole

72: axial groove

47: Outer stop surface

44: Orientation piece

45: tubular shaft

73: Spring Ball Set

75: end cap

80: screwdriver

[FIG. 1] A three-dimensional appearance view of a torque wrench of the present invention at a first viewing angle.

[FIG. 2] It is a perspective view of a second perspective perspective view of the torque wrench of the present invention.

[Fig. 3] It is a three-dimensional exploded view of the first viewing angle of the working unit, the tripping unit and the preload spring of the torque wrench of the present invention.

[Fig. 4] An exploded perspective view of the torque adjustment structure of the torque wrench of the present invention at the first viewing angle.

(Fig. 5) The second perspective stereoscopic view of the operating unit, tripping unit and preload spring of the torque wrench of the present invention exploded view.

[Fig. 6] An exploded perspective view of the torque adjustment structure of the torque wrench of the present invention in a second viewing angle.

[FIG. 7] It is a sectional view of VII-VII of FIG. 1. [FIG.

[FIG. 8] An enlarged cross-sectional view of the torque adjusting structure of the present invention.

[FIG. 9] Schematic diagram of the sectional action of the torque zero correction of the present invention.

[FIG. 10] Schematic diagram of the sectional action of the torque adjustment of the present invention.

In order to illustrate the central idea of the present invention expressed in the column of the above-mentioned summary of the invention, it is expressed in specific embodiments. Various objects in the embodiments are drawn according to proportions, sizes, deformations or displacements suitable for illustration, rather than drawn according to the proportions of actual components, which are described first. And in the following description, the same and symmetrically arranged elements are denoted by the same reference numerals.

As shown in FIGS. 1 to 4 , the torque wrench of the present invention includes a tubular body 10 , a working unit 20 , a tripping unit 24 , and a torque adjustment structure 40 .

As shown in FIG. 3 to FIG. 8 , the working unit 20 includes a tool head 21 , and the tool head 21 can be in various types, not limited to those shown in the illustrations. The tool head 21 is inserted into one end of the pipe body 10 with a shaft portion 22 , and a pivot element 23 is pivotally connected to the shaft portion 22 and the pipe body 10 , and the outer diameter of the shaft portion 22 is smaller than the inner diameter of the pipe body 10 . Therefore, the shaft portion 22 can slightly deflect around the pivot element 23 in the tube body 10 .

The tripping unit 24 is disposed inside the tube body 10 . It includes a top piece 25, a first groove 26 at the front end of the top piece 25, a second groove 27 at the rear end of the shaft portion 22, a first groove 26 and a second groove 27 A trip block 28 and a preload spring 30 in it. The top piece 25 is sheathed in an inner shaft sleeve 11 (as shown in FIG. 7 ) inside the pipe body 10 , and the inner diameter of the inner shaft sleeve 11 is the same as that of the top piece. The outer diameter of 25 coincides. The preload spring 30 is disposed inside the tube body 10 , and the front end of the preload spring 30 presses against the end of the top member 25 . A rear end of the preload spring 30 is connected to the torsion adjustment structure 40 . The torsion adjustment structure 40 can adjust the elastic force of the preload spring 30 to act on the top piece 25 with a preload, and the top piece 25 and the shaft portion 22 can press the escape block 28 with the preload. The jumping unit 24 is a known technology, which is not a technical feature of the present invention, so it will not be described in detail. The tripping unit 24 of the present invention is not limited to what is shown in the illustration, and other forms of tripping unit 24 can also be applied to the present invention.

The torque adjustment structure 40 includes: a push cylinder 41 , a correction push shaft 50 , a correction assembly 53 , a rotary follower 60 , a positioning ring 66 , a rotary drive 70 , and an end cap 75 .

Regarding the push cylinder 41 , the calibration push shaft 50 and the calibration assembly 53 . The push cylinder 41 includes a cylindrical shaft 42 and a tubular shaft 45, both of which communicate with the center of the shaft. Both the inner diameter and the outer diameter of the cylindrical shaft 42 are larger than the inner diameter and the outer diameter of the tubular shaft 45 , so an inner stop surface 46 and an outer stop surface 47 are formed at the junction. The calibration push shaft 50 includes a sleeve portion 51 and a push contact portion 52, both of which are connected with the center of the shaft. The sleeve portion 51 is disposed in the cylindrical shaft 42 and is attached to the inner stop surface 46 . The pushing portion 52 extends from the tubular shaft 45 . The cylindrical shaft 42 is disposed in the tubular body 10 , the cylindrical shaft 42 receives the pre-compression spring 30 , and the end of the pre-compression spring 30 is sleeved and attached to the sleeve portion 51 . The outer wall of the cylindrical shaft 42 is provided with a chute 43, the chute 43 is parallel to the axis of the cylindrical shaft 42, the chute 43 is for a directional member 44 to be slidably located therein, and the directional member 44 is fixed on the The pipe wall of the pipe body 10 . The calibration assembly 53 includes a push-contact piece 54 , a ball 55 , and a fine-tuning piece 56 . The correction assembly 53 is arranged in the tubular shaft 45, the push contact part 54 presses the push contact part 52, the ball 55 is located between the fine adjustment part 56 and the push contact part 54, the fine adjustment part 56 and the tubular shaft 45 is threaded connection. The trimmer 56 has a tool hole 57 .

The rotary follower 60 includes an annular head 61 and a connecting shaft 62 . The ring head 61 and the connecting shaft 62 are connected with the same axis. The rotary follower 60 is sleeved on the outside of the tubular shaft 45, and both threaded connection. The ring head 61 is attached to the outer stop surface 47 . Due to the difference in outer diameter between the ring head 61 and the connecting shaft 62 , a step 63 is formed at the junction. The connecting shaft 62 has a polygonal outer wall. The end of the connecting shaft 62 has a buckle groove 64 .

The positioning ring 66 is threaded on the outside of the rotary follower 60 , and the external thread is connected to the internal thread at the end of the pipe body 10 . The positioning ring 66 is attached to the step 63 of the annular head 61 so as to axially position the rotary follower 60 . Two bead grooves 67 are arranged at an interval of 180 degrees on the end ring surface of the positioning ring 66 .

The rotation driving part 70 is connected to the polygonal outer wall of the connecting shaft 62 of the rotation driven part 60 with a polygonal shaft hole 71, forming the rotation direction of the rotation driving part 70 and the rotation driven part 60. limit relationship. The connecting shaft 62 passes through the end of the polygonal shaft hole 71, and is fastened to the buckle groove 64 with a C-shaped buckle 65, constituting the axial limit of the rotation active part 70 and the rotation follower 60. bit relationship. The rotating active part 70 is provided with two axial grooves 72 , each of which is filled with a spring ball set 73 , and the balls of the spring ball set 73 are inserted into the bead groove 67 .

The end cap 75 is combined with the end of the rotating active member 70 in a detachable and assembleable structure (including but not limited to elastic fastening), so as to close the rotating active member 70 .

As shown in FIG. 9 , it is a schematic diagram of performing torque zero calibration with the calibration push shaft 50 and the calibration assembly 53 . Firstly, the tool head 21 of the working unit 20 is socketed on a torque meter (not shown). Then, the end cover 75 is removed, and a screwdriver 80 is inserted into and combined with the tool hole 57 of the trimmer 56 . Rotating the screwdriver 80 drives the fine adjustment member 56 to rotate, and the fine adjustment member 56 moves linearly along the screw thread. The forward linear movement of the trimmer 56 pushes the ball 55 and the push contact 54 to move synchronously, and the push contact 54 pushes the correction push shaft 50 to slightly push the preload spring 30 forward, and the fine adjustment increases. The torque value of the wrench. Conversely, the linear movement of the trimmer 56 can relax the preload spring 30, and the elastic restoring force of the preload spring 30 pushes the correction push shaft 50, the push contact 54 and the roller. Bead 55 moves. Through the torque value measured by the torque meter, the torque correction is reset to zero, and the subsequent torque adjustment can be accurate.

Fig. 10 is a schematic cross-sectional view of the torque adjustment of the present invention. Manually rotate the rotating and adjusting driving part 70 , the rotating and adjusting driving part 70 drives the rotating and adjusting driven part 60 to rotate, and the push cylinder 41 linearly moves along the thread line. The forward linear movement of the push cylinder 41 pushes the preload spring 30 to increase the torque value of the wrench. Conversely, the backward linear movement of the push cylinder 41 can relax the preload spring 30 and reduce the torque value of the wrench. An index (not shown) can be set on the outer wall of the cylindrical shaft 42 on the outer wall of the pusher 41, and the index can be exposed in a preset window 12 (as shown in Figure 1) of the tube body 10, and the window 12 on the adjacent side The outer wall of the pipe body 10 can be preset with a scale 13, through the displacement of the push cylinder 41, the indicator and the scale 13 are used for the operator to know the torque value.

In addition, by manually rotating the rotating active part 70 by 180 degrees, the spring ball assembly 73 will switch from one bead groove 67 to the other bead groove 67, making a switching sound of "da, da" and allowing the operator to There is a sense of frustration and stagnation. Based on this, the operator must intentionally apply a relatively large rotational force to manipulate the rotary driving member 70 . The advantage of this is that when the user holds the wrench to turn the bolt or the nut, the power of holding the wrench and operating will not mistakenly touch and turn the rotating active member 70 to change the torque setting. Preferably, the rotating active part 70 rotates 180 degrees, so that the push cylinder 41 can be displaced by a scale 13, so that the operator can visually observe the scale 13 and at the same time cooperate with the frustrating feel of the spinning and the switching sound of "da, da". And more clearly know the degree of torque adjustment.

No matter whether it is zero calibration or torque adjustment, the preload applied by the preload spring 30 to the tripping unit 24 and the working unit 20 is changed. When the force applied by the wrench to turn the bolt or nut exceeds the set torque value, the shaft part 22 of the working unit 20 is deflected in the pipe body 10, the first groove 26 and the second groove 27 Offset misalignment occurs, the axis of the tool head 21 deviates from the pipe body The axis line of 10 hits the inner wall of the pipe body 10 to make vibration and sound, and the operator can know that the applied force of the wrench has reached the preset torque value.

10: tube body

11: Inner shaft sleeve

12: Windows

20: Work unit

21: Tool head

22: Shaft

23: Pivot element

25: Top piece

28: Jump Block

30: Preloaded spring

41: push cylinder

42: Cylindrical shaft

43: Chute

44: Orientation piece

45: tubular shaft

46: Inner stop surface

47: Outer stop surface

51: Socket

52: push contact part

54: push contact

55: Ball

56: Trimmer

60:Rotary follower

61: ring head

62: connecting shaft

65: C-type buckle

66: positioning ring

70: Rotate the active part

73: Spring Ball Set

75: end cap

Claims (7)

A torque adjustment structure of a torque wrench, the torque wrench includes a pipe body, one end of the pipe body is connected with a working unit, the other end of the pipe body is provided with a torque adjustment structure; the inside of the pipe body is provided with a tripping unit and A preload spring; the torsion adjustment structure adjusts the preload that the preload spring exerts on the tripping unit to press the working unit, so as to adjust the torque of the torque wrench; it is characterized in that: the torsion adjustment structure includes: a push Cylinder, the push cylinder includes a cylindrical shaft and a tubular shaft, both of which communicate with the center of the shaft; the cylindrical shaft and the tubular shaft form an inner stop surface and an outer stop surface at the junction due to differences in inner and outer diameters; The push cylinder is arranged in the pipe body, and the push cylinder and the pipe body are in a rotation-limiting relationship; the end of the pre-loaded spring extends into the cylindrical shaft and resists the inner stop surface; a rotation The follower is sleeved on the outside of the tubular shaft, and the rotary follower is threadedly connected with the tubular shaft; a positioning ring is sleeved on the outside of the rotary follower and is located inside the end of the pipe body; The locating ring is threadedly connected to the inside of the end of the pipe body; a rotating active part is sheathed and axially limited on the outside of the rotating follower, and the rotating direction of the rotating active part and the rotating follower is position-limiting relationship; and an end cover, which is combined at the end of the rotating active part to close the rotating active part. The torque adjustment structure of the torque wrench as described in claim 1, it further includes a correction push shaft, the correction push shaft includes a socket part and a push contact part, both of which are connected with the shaft center; the socket part is arranged on the In the cylindrical shaft, it is attached to the inner stop surface; the push contact part is extended in the tubular shaft; the preset The end of the pressure spring is sleeved on the socket part; a fine adjustment part is arranged in the tubular shaft, and the fine adjustment part is threadedly connected with the tubular shaft, and the fine adjustment part pushes and touches the push contact part; the fine adjustment part is different One end of the push contact part is provided with a tool hole. The torque adjustment structure of the torque wrench as described in Claim 1, wherein, the outer wall of the cylindrical shaft is provided with a chute, the chute is parallel to the axis of the cylindrical shaft, and the chute provides a slidable Located therein, the directional piece is fixed on the pipe wall of the pipe body; the chute and the directional piece form a rotation-limiting relationship between the cylindrical shaft and the pipe body. The torque adjustment structure of the torque wrench as claimed in item 1, wherein the rotary follower includes an annular head and a connecting shaft; the annular head and the connecting shaft are connected with the center of the shaft; the annular head stops Attached to the outer stop surface; the annular head and the connecting shaft form a step at the junction due to the difference in outer diameter. The positioning ring is sleeved on the outside of the connecting shaft and is attached to the step. The torque adjustment structure of the torque wrench as described in claim 4, wherein, the end ring surface of the positioning ring is provided with two bead grooves at intervals of 180 degrees; the rotating active part is provided with two axial grooves, each of which is filled with a spring ball Bead group, the ball person of this spring ball bead group sinks in this bead groove. The torque adjustment structure of a torque wrench according to claim 4, wherein the connecting shaft has a polygonal outer wall, and the rotating active part is connected to the connecting shaft with a polygonal shaft hole, so as to form the rotating active part and the The rotary follower is in a rotation limit relationship. The torque adjustment structure of the torque wrench according to claim 6, wherein the end of the connecting shaft has a buckle groove; the connecting shaft passes through the end of the polygonal shaft hole, and a C-shaped buckle is fastened to the buckle The groove constitutes the axial limit relationship between the rotating active part and the rotating driven part.

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