CN113465805B - Torque performance evaluation method of adjustable wrench - Google Patents

Torque performance evaluation method of adjustable wrench Download PDF

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Publication number
CN113465805B
CN113465805B CN202110879080.2A CN202110879080A CN113465805B CN 113465805 B CN113465805 B CN 113465805B CN 202110879080 A CN202110879080 A CN 202110879080A CN 113465805 B CN113465805 B CN 113465805B
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clamping surface
movable
spanner
rotation center
opening
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CN113465805A (en
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邵永成
王伟刚
于金汕
李世刚
庞年群
张志新
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Weihaishiweili Top Grade Tool Co
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Weihaishiweili Top Grade Tool Co
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/0028—Force sensors associated with force applying means
    • G01L5/0042—Force sensors associated with force applying means applying a torque
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B13/00—Spanners; Wrenches
    • B25B13/10—Spanners; Wrenches with adjustable jaws
    • B25B13/12—Spanners; Wrenches with adjustable jaws the jaws being slidable
    • B25B13/14—Spanners; Wrenches with adjustable jaws the jaws being slidable by rack and pinion, worm or gear

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)

Abstract

The invention discloses a torque performance evaluation method of an adjustable wrench, and belongs to the technical field of hardware tools. The torque performance evaluation method of the adjustable wrench comprises the steps of (1) setting a rotation center and a stress point of a movable wrench opening; (2) setting a reference surface; and (3) analyzing stress conditions of the movable spanner opening and the like. According to the torque performance evaluation method of the adjustable wrench, provided by the invention, the stress analysis method of the adjustable wrench is determined by reasonably setting the rotation center, the stress point, the stress direction and the like of the adjustable wrench opening, and meanwhile, the relation between the stress condition of the flat rib part and the inclination angle of the clamping surface S2 is determined, so that effective guidance is provided for research and development and improvement of the adjustable wrench.

Description

Torque performance evaluation method of adjustable wrench
Technical Field
The invention relates to a torque performance evaluation method of an adjustable wrench, and belongs to the technical field of hardware tools.
Background
The adjustable spanner is a common hardware tool, a fixed spanner opening and a movable spanner opening for clamping workpieces are arranged on the adjustable spanner, and the movable spanner opening can move towards or away from the fixed spanner opening along a sliding groove so as to adjust the distance between the fixed spanner opening and the movable spanner opening, so that the adjustable spanner can clamp the workpieces with different sizes to perform screwing or unscrewing operations. In general, the movable spanner opening is composed of a clamping part, a flat rib part and a columnar part, wherein the clamping part is provided with a clamping surface which can be matched with the fixed spanner opening, the bottom of the columnar part is provided with a tooth-shaped structure, the tooth-shaped structure is meshed with a worm wheel, and the worm wheel rotates to drive the movable spanner opening to move. When the workpiece is screwed, the clamping part and the columnar part of the movable spanner opening bear corresponding moments respectively, and the flat rib part is connected between the clamping part and the columnar part, so that the flat rib part bears great force, and the thickness of the flat rib part is thin, so that the flat rib part is easy to damage. When a torque test is carried out on a commercial adjustable spanner, the flat rib part of the adjustable spanner opening is damaged basically when a standard torque value is reached, and the service life of the adjustable spanner is seriously influenced. In order to improve the strength of the flat rib portion, manufacturers try to improve the manufacturing materials and mechanical structure of the adjustable wrench, but no obvious effect is obtained. Moreover, the stress condition of the adjustable spanner is complex, and the manufacturer can only obtain the mechanical property of the adjustable spanner after actually detecting by a test instrument at present.
The foregoing is not necessarily a prior art, and falls within the technical scope of the inventors.
Disclosure of Invention
The invention provides a torque performance evaluation method of an adjustable wrench for solving the problems existing in the prior art, and provides effective guidance for research and development improvement of the adjustable wrench.
The invention realizes the aim by adopting the following technical scheme:
the invention provides a torque performance evaluation method of an adjustable wrench, which comprises the following steps:
(1) Setting a rotation center and a stress point of the movable spanner opening:
setting a point on a contact surface between a clamping part of the movable spanner opening and the top of the side wall of the chute as a rotation center O of the movable spanner opening during working;
when the movable spanner works, one point on the contact surface between the top of the inner end of the columnar part of the movable spanner and the side wall of the chute is set as a stress point K1, the acting force direction of the inner end of the columnar part of the movable spanner passes through the stress point K1, and the acting force arm of the inner end of the columnar part of the movable spanner passes through the rotation center O and is vertical to the acting force direction of the inner end of the columnar part of the movable spanner;
setting a point on the contact surface of the clamping surface S2 of the movable spanner opening and the workpiece as a stress point K2 of the clamping surface S2 during working, wherein the distance between the stress point K2 and the rotation center O is L0;
(2) Setting a reference surface:
setting a clamping surface S2' perpendicular to the X direction as a reference surface, wherein the acting force F2' on the clamping surface S2' is L2', and the included angle between L2' and L0 is beta;
(3) Analyzing the stress condition of the movable spanner opening:
(3.1) setting the sliding direction of the movable spanner opening away from the fixed spanner opening as a positive X direction, setting the inclination angle of the actual clamping surface S2 relative to the clamping surface S2' to the positive X direction as theta, setting the acting force on the clamping surface S2 as F2, setting the moment arm of the acting force F2 on the rotation center O as L2, and setting the included angle between L2 and L0 as beta+theta, wherein L2=L0 is cos (beta+theta);
the acting force on the clamping surface S2 'is F2', the force arm of the acting force F2 'to the rotation center O is L2', the included angle between L2 'and L0 is β, and L2' =l0×cos (β);
(3.2) a moment m2=f2×l2 of the rotation center O by the force F2, so m2=f2×l2= |f2|l0×cos (β+θ);
the moment of force F2 'on rotation center O, M2' =f2 '×l2', therefore M2 '=f2' =l2 '= |f2' |l0×cos (β);
(3.3) when the inclination angle of the actual clamping surface S2 of the movable jaw relative to the clamping surface S2' is different, the rotation center O of the movable jaw is unchanged, the distance between a stress point K2 on the clamping surface S2 and the axis of the workpiece is the same, and the critical force required by the rotation of the workpiece is the same, so that when the actual clamping surface S2 is at different inclination angles, the acting force F2 on the clamping surface S2 is different in direction but the same in size, and therefore |F2|= |F2|;
and β+θ is an acute angle, cos (β+θ) < cos (β), so m2= |f2|l0×cos (β+θ) < m2' = |f2' |l0×cos (β), i.e., M2 < M2';
(3.4) when the clamping surface S2' is on the reference surface, the acting force at the inner end of the columnar part of the movable spanner opening is F1', the force arm of the acting force F1' around the rotation center O is L1', and the moment at the inner end of the columnar part of the movable spanner opening around the rotation center O is M1' =f1 ' ×l1';
when the inclination angle of the clamping surface S2 relative to the clamping surface S2' in the positive X direction is θ, the acting force at the inner end of the columnar portion of the movable jaw is F1, the moment arm of the acting force F1 around the rotation center O is L1, and the moment at the inner end of the columnar portion of the movable jaw around the rotation center O is m1=f1×l1;
m1 and M2 are a pair of equilibrium moments, M1 'and M2' are a pair of equilibrium moments, i.e., m1=m2, m1 '=m2'; and because M2 is less than M2', M1 is less than M1';
that is, when the clamping surface S2 is inclined in the positive X direction with respect to the clamping surface S2', the moment M1 of the rotation center O by the force of the inner end of the columnar portion of the movable jaw is reduced, the moment M2 of the rotation center O by the force of the clamping surface S2 is also reduced, and the tension force received by the flat rib of the movable jaw is reduced, so that the torque that the movable jaw can receive is increased.
Preferably, θ is taken from 2 ° to 45 °.
More preferably, θ is taken from 10 ° to 20 °.
Further, the adjustable spanner comprises a spanner body, wherein the head of the spanner body is provided with:
the inner end of the fixed spanner opening is integrally connected with the head of the spanner body, and the clamping surface S1 is arranged on the side part of the fixed spanner opening;
the inner end of the movable spanner opening is in linear sliding connection with the head of the spanner body, the clamping surface S2 is arranged on the side part of the movable spanner opening, and the clamping surface S2 and the clamping surface S1 are oppositely arranged;
the adjusting assembly is used for driving the movable spanner opening to slide towards and away from the fixed spanner opening so as to change the distance between the clamping surface S1 and the clamping surface S2.
Further, the clamping surface S1 is arranged parallel to the clamping surface S2.
The beneficial effects of the invention include, but are not limited to:
according to the torque performance evaluation method of the adjustable wrench, provided by the invention, the stress analysis method of the adjustable wrench is determined by reasonably setting the rotation center, the stress point, the stress direction and the like of the adjustable wrench opening, and meanwhile, the relation between the stress condition of the flat rib part and the inclination angle of the clamping surface S2 is determined, so that effective guidance is provided for research and development and improvement of the adjustable wrench.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
FIG. 1 is a schematic view of a wrench when the clamping surface S2' is perpendicular to the X direction;
fig. 2 is a schematic structural view of the adjustable wrench when the inclination angle of the clamping surface S2 to the positive X direction is θ with respect to the clamping surface S2';
FIG. 3 is an enlarged view of a portion of the structure of FIG. 2;
FIG. 4 is an enlarged view of the movable jaw;
FIG. 5 is an enlarged view of the wrench body and fixed jaw;
100, a wrench body; 110. a fixed spanner opening; 120. a movable spanner opening; 121. a clamping part; 122. flat rib parts; 123. a columnar portion; 124. a tooth-like structure; 210. a chute; 220. a through hole; 230. a worm wheel; 240. a worm wheel shaft; 250. and the shaft hole.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present invention will be described in detail below with reference to the following detailed description and the accompanying drawings.
It should be noted that in the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than as described herein. Therefore, the scope of the invention is not limited by the specific embodiments disclosed below.
The invention provides a torque performance evaluation method of an adjustable wrench, which comprises the following steps:
(1) Setting a rotation center and a stress point of the movable spanner opening:
as shown in fig. 1-3, a point on the contact surface of the clamping part of the movable spanner opening and the top of the side wall of the chute is set as the rotation center O of the movable spanner opening during working;
when the movable spanner works, one point on the contact surface between the top of the inner end of the columnar part of the movable spanner and the side wall of the chute is set as a stress point K1, the acting force direction of the inner end of the columnar part of the movable spanner passes through the stress point K1, and the acting force arm of the inner end of the columnar part of the movable spanner passes through the rotation center O and is vertical to the acting force direction of the inner end of the columnar part of the movable spanner;
setting a point on the contact surface of the clamping surface S2 of the movable spanner opening and the workpiece as a stress point K2 of the clamping surface S2 during working, wherein the distance between the stress point K2 and the rotation center O is L0;
(2) Setting a reference surface:
setting a clamping surface S2' perpendicular to the X direction as a reference surface, wherein the acting force F2' on the clamping surface S2' is L2', and the included angle between L2' and L0 is beta;
(3) Analyzing the stress condition of the movable spanner opening:
(3.1) setting the sliding direction of the movable spanner opening away from the fixed spanner opening as a positive X direction, setting the inclination angle of the actual clamping surface S2 relative to the clamping surface S2' to the positive X direction as theta, setting the acting force on the clamping surface S2 as F2, setting the moment arm of the acting force F2 on the rotation center O as L2, and setting the included angle between L2 and L0 as beta+theta, wherein L2=L0 is cos (beta+theta);
the acting force on the clamping surface S2 'is F2', the force arm of the acting force F2 'to the rotation center O is L2', the included angle between L2 'and L0 is β, and L2' =l0×cos (β);
(3.2) a moment m2=f2×l2 of the rotation center O by the force F2, so m2=f2×l2= |f2|l0×cos (β+θ);
the moment of force F2 'on rotation center O, M2' =f2 '×l2', therefore M2 '=f2' =l2 '= |f2' |l0×cos (β);
(3.3) when the inclination angle of the actual clamping surface S2 of the movable jaw relative to the clamping surface S2' is different, the rotation center O of the movable jaw is unchanged, the distance between a stress point K2 on the clamping surface S2 and the axis of the workpiece is the same, and the critical force required by the rotation of the workpiece is the same, so that when the actual clamping surface S2 is at different inclination angles, the acting force F2 on the clamping surface S2 is different in direction but the same in size, and therefore |F2|= |F2|;
and β+θ is an acute angle, cos (β+θ) < cos (β), so m2= |f2|l0×cos (β+θ) < m2' = |f2' |l0×cos (β), i.e., M2 < M2';
(3.4) when the clamping surface S2' is on the reference surface, the acting force at the inner end of the columnar part of the movable spanner opening is F1', the force arm of the acting force F1' around the rotation center O is L1', and the moment at the inner end of the columnar part of the movable spanner opening around the rotation center O is M1' =f1 ' ×l1';
when the inclination angle of the clamping surface S2 relative to the clamping surface S2' in the positive X direction is θ, the acting force at the inner end of the columnar portion of the movable jaw is F1, the moment arm of the acting force F1 around the rotation center O is L1, and the moment at the inner end of the columnar portion of the movable jaw around the rotation center O is m1=f1×l1;
m1 and M2 are a pair of equilibrium moments, M1 'and M2' are a pair of equilibrium moments, i.e., m1=m2, m1 '=m2'; and because M2 is less than M2', M1 is less than M1';
that is, when the clamping surface S2 is inclined in the positive X direction with respect to the clamping surface S2', the moment M1 of the rotation center O by the force of the inner end of the columnar portion of the movable spanner decreases, the moment M2 of the rotation center O by the force of the clamping surface S2 decreases, and the tension force received by the flat rib of the movable spanner decreases, so that the torque that the movable spanner can receive increases, that is, the torque received by the movable spanner is higher as shown in fig. 2 and 3.
Preferably, θ is taken from 2 ° to 45 °.
More preferably, θ is taken from 10 ° to 20 °.
Further, the adjustable wrench of the present invention includes a wrench body 100, and a fixed wrench opening 110 and a movable wrench opening 120 are disposed on the head of the wrench body 100. Specifically, the inner end of the fixed jaw 110 is integrally connected with the head of the wrench body 100, and the side of the fixed jaw 110 is provided with the clamping surface S1; the inner end of the movable jaw 120 is slidably connected with the head of the wrench body 100 along a straight line, the side portion of the movable jaw 120 is provided with the clamping surface S2, and the clamping surface S2 and the clamping surface S1 are oppositely arranged to form a clamping opening.
The movable spanner opening 120 can slide towards and away from the fixed spanner opening 110 along the X direction to change the distance between the clamping surface S1 and the clamping surface S2, so as to adjust the size of the clamping opening of the movable spanner, and an adjusting assembly for driving the movable spanner opening 120 to move is further arranged on the movable spanner.
The adjustable wrench is mainly applied to a hexagonal workpiece, and the clamping surface S1 on the fixed jaw 110 and the clamping surface S2 on the movable jaw 120 are preferably arranged in parallel for a sufficiently large contact area with the workpiece surface.
As shown in fig. 4 and 5, the movable jaw 120 according to the present invention is composed of a clamping portion 121, a flat rib portion 122, and a columnar portion 123, and the diameter of the columnar portion 123 is greater than the thickness of the flat rib portion 122.
Specifically, the adjusting assembly includes a toothed structure 124 provided on the cylindrical portion 123, a chute 210 provided on the head of the wrench body 100, a through hole 220, a worm wheel 230, a worm wheel shaft 240, and a shaft hole 250. Wherein, the sliding groove 210 is formed at the head of the wrench body 100, the sliding groove 210 extends along the X direction, the flat rib portion 122 and the column portion 123 of the movable wrench opening 120 are respectively slidably disposed at the upper portion and the lower portion of the sliding groove 210, and the width of the upper portion of the sliding groove 210 is smaller than the width of the lower portion of the sliding groove 210. The through hole 220 communicates with the bottom surface of the chute 210, and the shaft hole 250 extends in the X direction and penetrates the through hole 220. The worm wheel 230 is disposed in the through hole 220, a center hole of the worm wheel 230 is disposed in the X direction, and both ends of the worm wheel shaft 240 pass through the center hole of the worm wheel 230 and extend into the shaft hole 250. When the size of the clamping opening needs to be adjusted, the worm wheel 230 is rotated to drive the movable spanner opening 120 meshed with the worm wheel to move along the X direction.
The applicant of the present invention has carried out actual tests on the stress conditions of the adjustable wrench when the clamping surface S2' is perpendicular to the X direction and when the inclination angle of the clamping surface S2 to the positive X direction is θ, the test results are as follows:
dimensions of each monkey wrench sample tested: the total length is 255.5-256.0mm, the head thickness is 16.2-16.6mm, and the head width is: 86.3-86.5mm, handle thickness of 12.8-13.0mm, handle width of 31.9-32.0mm;
the test uses the instrument: torsion tester FM0901;
the execution standard: ASME B107.100-2020 (Category 8 Adjustable Wrench);
ASME standard torque is more than or equal to 508N.m;
TABLE 1 relationship between maximum torque and θ for an monkey wrench
Sample of Theta range Bearing maximum torque
1 10° 1.7 times ASME standard torque
2 15° 2.0 times ASME standard torque
3 20° 2.4 times ASME standard torque
From the table above, it can be seen that the maximum torque value borne by the adjustable wrench increases with increasing θ in the selected test range, and it is verified that the torque performance evaluation method provided by the invention is reasonable and reliable.
In the description of the present invention, it should be understood that the terms "top," "bottom," "inner," "outer," "axial," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "connected," "fixed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The above embodiments are not to be taken as limiting the scope of the invention, and any alternatives or modifications to the embodiments of the invention will be apparent to those skilled in the art and fall within the scope of the invention.
The present invention is not described in detail in the present application, and is well known to those skilled in the art.

Claims (4)

1. A torque performance evaluation method of an adjustable wrench is characterized by comprising the following steps:
(1) Setting a rotation center and a stress point of the movable spanner opening:
the adjustable spanner includes the spanner body, the head of spanner body is provided with:
the inner end of the fixed spanner opening is integrally connected with the head of the spanner body, and the side part of the fixed spanner opening is provided with a clamping surface S1;
the inner end of the movable spanner opening is in linear sliding connection with the head of the spanner body, a clamping surface S2 is arranged on the side part of the movable spanner opening, and the clamping surface S2 and the clamping surface S1 are arranged oppositely;
the adjusting component is used for driving the movable spanner opening to slide towards and away from the fixed spanner opening so as to change the distance between the clamping surface S1 and the clamping surface S2;
the movable spanner opening consists of a clamping part, a flat rib part and a columnar part, wherein the diameter of the columnar part is larger than the thickness of the flat rib part;
the adjusting component comprises a tooth-shaped structure arranged on the columnar part, a chute, a through hole, a worm wheel shaft and a shaft hole, wherein the chute, the worm wheel shaft and the shaft hole are arranged at the head part of the wrench body, the chute is arranged at the head part of the wrench body, the chute extends along the X direction, the flat rib part and the columnar part of the movable wrench opening are respectively arranged at the upper part and the lower part of the chute in a sliding way, the through hole is communicated with the bottom surface of the chute, the shaft hole extends along the X direction and penetrates through the through hole, the worm wheel is arranged in the through hole, the central hole of the worm wheel is arranged along the X direction, the two ends of the worm wheel shaft penetrate through the central hole of the worm wheel and extend into the shaft hole, and the movable wrench opening meshed with the worm wheel is driven to move along the X direction by rotating the worm wheel;
setting a point on a contact surface between a clamping part of the movable spanner opening and the top of the side wall of the chute as a rotation center O of the movable spanner opening during working;
when the movable spanner works, one point on the contact surface between the top of the inner end of the columnar part of the movable spanner and the side wall of the chute is set as a stress point K1, the acting force direction of the inner end of the columnar part of the movable spanner passes through the stress point K1, and the acting force arm of the inner end of the columnar part of the movable spanner passes through the rotation center O and is vertical to the acting force direction of the inner end of the columnar part of the movable spanner;
setting a point on the contact surface of the clamping surface S2 of the movable spanner opening and the workpiece as a stress point K2 of the clamping surface S2 during working, wherein the distance between the stress point K2 and the rotation center O is L0;
(2) Setting a reference surface:
setting a clamping surface S2' perpendicular to the X direction as a reference surface, wherein the acting force F2' on the clamping surface S2' is L2', and the included angle between L2' and L0 is beta;
(3) Analyzing the stress condition of the movable spanner opening:
(3.1) setting the sliding direction of the movable jaw away from the fixed jaw as a positive X direction, setting the inclination angle of the actual clamping surface S2 relative to the clamping surface S2' to the positive X direction as theta, setting the acting force on the clamping surface S2 as F2, setting the moment arm of the acting force F2 to the rotation center O as L2, and setting the included angle between L2 and L0 as beta+theta, wherein L2=L0
Figure DEST_PATH_IMAGE001
；
The acting force on the clamping surface S2 'is F2', the force arm of the acting force F2 'to the rotation center O is L2', the included angle between L2 'and L0 is β, and L2' =l0 ×
Figure 110880DEST_PATH_IMAGE002
；
(3.2) moment m2=f2×l2 of the force F2 to the rotation center O, so m2=f2×l2= |f2|l0× therefore
Figure 637677DEST_PATH_IMAGE001
；
The moment of force F2 'on rotation center O, M2' =f2 '×l2', therefore, M2 '=f2' =l2 '= |f2' |l0
Figure 883719DEST_PATH_IMAGE002
；
(3.3) when the inclination angle of the actual clamping surface S2 of the movable jaw relative to the clamping surface S2' is different, the rotation center O of the movable jaw is unchanged, the distance between a stress point K2 on the clamping surface S2 and the axis of the workpiece is the same, and the critical force required by the rotation of the workpiece is the same, so that when the actual clamping surface S2 is at different inclination angles, the acting force F2 on the clamping surface S2 is different in direction but the same in size, and therefore |F2|= |F2|;
beta+θ is acute angle
Figure 345924DEST_PATH_IMAGE001
＜/>
Figure 428150DEST_PATH_IMAGE002
Thus m2= |f2|l0|for +|>
Figure 634003DEST_PATH_IMAGE001
＜M2′=|F2′|* L0*
Figure 501596DEST_PATH_IMAGE002
I.e., M2 < M2';
(3.4) when the clamping surface S2' is on the reference surface, the acting force at the inner end of the columnar part of the movable spanner opening is F1', the force arm of the acting force F1' around the rotation center O is L1', and the moment at the inner end of the columnar part of the movable spanner opening around the rotation center O is M1' =f1 ' ×l1';
when the inclination angle of the clamping surface S2 relative to the clamping surface S2' in the positive X direction is θ, the acting force at the inner end of the columnar portion of the movable jaw is F1, the moment arm of the acting force F1 around the rotation center O is L1, and the moment at the inner end of the columnar portion of the movable jaw around the rotation center O is m1=f1×l1;
m1 and M2 are a pair of equilibrium moments, M1 'and M2' are a pair of equilibrium moments, i.e., m1=m2, m1 '=m2'; and because M2 is less than M2', M1 is less than M1';
that is, when the clamping surface S2 is inclined in the positive X direction with respect to the clamping surface S2', the moment M1 of the rotation center O by the force of the inner end of the columnar portion of the movable spanner decreases, the moment M2 of the rotation center O by the force of the clamping surface S2 decreases, and the tension force received by the flat rib portion of the movable spanner decreases, so that the torque that the movable spanner can receive increases.
2. The method for evaluating torque performance of an adjustable wrench according to claim 1, wherein θ is taken from 2 ° to 45 °.
3. The method for evaluating torque performance of an adjustable wrench according to claim 1, wherein θ is taken from 10 ° to 20 °.
4. The method for evaluating torque performance of an adjustable wrench according to claim 1, wherein the clamping surface S1 is provided in parallel with the clamping surface S2.
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Citations (2)

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