Ratchet wrench and machining method thereof

Abstract

The invention discloses a ratchet wrench, belongs to a manual tool for applying torsion, and aims to solve the problem that the maximum output torsion of an existing ratchet tool is small. A transition part of a connecting handle is arranged on a main body of a ratchet working end, a containing groove is communicated with a containing space and deviates from the containing space to the transition part, and the containing groove is provided with a supporting wall; the pawl enables the second teeth to be meshed with the first teeth through the elastic force of the elastic element, the back face of the pawl abuts against the supporting wall, and the ratio of the thickness of the supporting wall to the diameter of the inscribed circle of the driving piece is limited to be 0.2-1. According to the ratchet wrench, the supporting wall is arranged at the transition part of the main body connecting handle instead of the peripheral wall, so that the thickness of the supporting wall is ensured, the peripheral wall is prevented from forming a weak part, and the maximum torsion of the ratchet wrench is increased. Moreover, the thickness of the supporting wall is changed along with the change of the diameter of the inscribed circle of the driving part, so that the requirements of ratchet wrenches of different specifications on the maximum torsion are met.

Description

Technical Field

[0001] The present invention belongs to a manual tool for applying torque, and particularly relates to a ratchet wrench capable of increasing the maximum torque. Background Art

[0002] In the existing ratchet tools, a driving member and a pawl that are engaged with each other are arranged on the main body. The pawl is mostly assembled on the main body by a shaft. When the main body drives the driving member to rotate synchronously through the pawl to apply torque to a workpiece, the supporting force of the main body on the pawl is transmitted by the shaft. The diameter of the shaft is limited, resulting in a limited maximum output torque of the ratchet tool. Moreover, in order to ensure the movement of the pawl, rotation is maintained between the shaft and the pawl or between the shaft and the main body, which leads to a large clearance when the pawl acts, and there is an idle stroke when the ratchet tool switches the rotation direction. For assembly, the end of the shaft usually protrudes from the surface of the main body and is easily collided and loosened.

[0003] In another existing ratchet tool, the pawl is placed in a receiving groove. When the main body drives the driving member to rotate synchronously through the pawl to apply torque to a workpiece, the supporting force of the main body on the pawl is provided by the supporting wall of the receiving groove. The receiving groove deviates from the circular hole-shaped accommodating space towards the peripheral wall, resulting in a relatively thin supporting wall. When the ratchet tool is working, especially when bearing a large torque, the peripheral wall is easily deformed, the inner diameter of the accommodating space presents major and minor axes, and it is easy to break at the weak supporting wall, and the maximum torque of the ratchet tool is small.

[0004] The existing processing method is single-station processing. It is necessary to first process the accommodating space at one station, and then process the crescent-shaped receiving groove (such as milling) at another station. It is necessary to adjust the tooling to fix the angle and determine the machining feed direction and the included angle α. This processing method has many steps, poor accuracy, and low efficiency. Summary of the Invention

[0005] The technical problem to be solved and the technical task proposed by the present invention are to overcome the defect of the small maximum output torque of the existing ratchet tools, and provide a ratchet wrench that increases the maximum torque by configuring a head structure.

[0006] To achieve the object of the invention, a solution of the ratchet wrench of the present invention is that it includes a handle, and at least one end of the handle is configured with a ratchet working end, and is characterized in that: the ratchet working end includes:

[0007] A main body, the main body is configured with a circular hole-shaped accommodating space and a receiving groove, and the circular hole-shaped accommodating space is defined by a peripheral wall,

[0008] A driving member, which is rotatably arranged in the accommodating space, and the outer peripheral surface of the driving member is provided with a first tooth,

[0009] A pawl, which is located in the receiving groove and has a second tooth,

[0010] An elastic element, which applies an elastic force to the pawl; and

[0011] The main body has a transition part with a connecting handle. The accommodating groove is located in the transition part and communicates with the accommodating space. The accommodating groove has a supporting wall. The pawl tends to be between the second tooth and the supporting wall by the elastic force of the elastic element. The ratio of the thickness of the supporting wall to the diameter of the inscribed circle of the driving part is 0.2 - 1. When the main body drives the driving part to rotate synchronously through the pawl, the supporting wall provides the supporting force of the main body on the pawl.

[0012] This ratchet wrench arranges the supporting wall at the transition part of the connecting handle of the main body instead of the peripheral wall, and limits the ratio of the thickness of the supporting wall to the diameter of the inscribed circle of the driving part to 0.2 - 1, ensuring that the supporting wall has sufficient thickness, avoiding the formation of weak parts on the peripheral wall, and increasing the maximum torque of the ratchet wrench. Moreover, as the diameter of the inscribed circle of the driving part changes, the thickness of the supporting wall also changes to meet the requirements of different specifications of ratchet wrenches for the maximum torque.

[0013] A method for determining the thickness of the supporting wall is as follows: the number of engagements between the second teeth and the first teeth is an integer from 3 to 12, and the thickness of the supporting wall is the average value of the thicknesses of the supporting walls corresponding to each second tooth.

[0014] In one embodiment, the thickness of the supporting wall is not less than the thickness of the peripheral wall to ensure the strength of the supporting wall and enable it to withstand a sufficiently large torque.

[0015] Specifically, the radial line of the accommodating groove deviates to one side of the center line of the handle. The radial line of the accommodating groove is the straight line where the center of curvature of the side wall of the accommodating groove and the center of curvature of the peripheral wall are located. The center line of the handle is the geometric center line of the handle. The radial line of the accommodating groove forms an angle with the center line of the handle. Based on this, the thickness of the supporting wall can be increased without increasing the contour size of the main body, thereby increasing the maximum torque of the ratchet wrench. Through experiments, when the angle between the radial line of the accommodating groove and the center line of the handle is 5 - 20°, the supporting wall can be located at a suitable position and maintain a suitable thickness to increase the maximum torque of the ratchet wrench.

[0016] Through experiments, the ratio of the angle to the diameter of the inscribed circle of the driving part is 0.5° / mm - 2.5° / mm, which can not only arrange the supporting wall at a suitable position on the main body, maintain a suitable thickness to increase the maximum torque of the ratchet wrench, but also take into account the strength of other parts on the main body.

[0017] Preferably, the accommodating groove is crescent-shaped. The center of curvature of the side wall of the accommodating groove is located on one side of the center line of the handle. The first end of the accommodating groove is adjacent to the center line of the handle, and the second end of the accommodating groove is far from the center line of the handle. The first end of the accommodating groove accommodates the pawl, and the side wall at the first end of the accommodating groove serves as the supporting wall, and the side wall at the second end of the accommodating groove serves as the supporting wall for supporting the elastic element. Based on this, a position is vacated for the supporting wall to shift towards the transition part and ensure the thickness of the supporting wall. In particular, the thickness of the supporting wall is less than the thickness of the peripheral wall to reasonably configure the stress condition of the transition part in the determined transition part contour and improve the torque it can withstand.

[0018] A support member is disposed at the second end of the receiving groove, and the elastic element applies an elastic force to the pawl by the support of the support member. The support member and the support wall are used to support the elastic element and do not need to bear the torsional force of the workpiece to be rotated. Accordingly, by offsetting the receiving groove relative to the central axis of the handle, the wall thickness of the support wall is reduced, the wall thickness of the support wall is increased, and the maximum torsional force of the ratchet wrench is increased.

[0019] Preferably, the pawl is a wedge-shaped block, and the wedge-shaped block matches the shape profile of the first end of the receiving groove. Accordingly, it is ensured that the pawl transmits the torsional force from the support wall to the driving member and can withstand a large support force, avoiding irreversible deformation caused by excessive force.

[0020] In one embodiment, the support member is a wedge-shaped block, and the wedge-shaped block matches the shape profile of the second end of the receiving groove. Accordingly, the support member can be held in a relatively stable position to ensure that the elastic element applies an elastic force to the pawl. Moreover, the support member can move and adjust its attitude and position within the second end of the receiving groove.

[0021] In one embodiment, the support member is a rod fixed to the second end of the receiving groove.

[0022] In one embodiment, there are n pawls, where n is 2 or 3, and the n pawls are stacked axially along the accommodating space. When the second tooth of any one pawl meshes with the first tooth, the second tooth of another pawl meshes with the first tooth at a reverse angle of β / n, where β is the central angle corresponding to one first tooth. Accordingly, when the workpiece is rotated, the handle only needs to be rotated reversely by a reverse angle of β / n to make the second tooth mesh with the first tooth. When rotating the workpiece in a narrow space, due to space limitations, it is difficult for the handle to rotate by a central angle corresponding to one first tooth. This structure can reduce the reverse rotation angle of the handle to make the second tooth mesh with the first tooth to achieve repeated rotation.

[0023] In one embodiment, the transition portion is integrally connected to the handle.

[0024] In one embodiment, the transition portion is connected to the handle via a shaft. Accordingly, the attitude of the working end of the ratchet relative to the handle can be adjusted, which is beneficial to adjusting the attitude of the workpiece to be rotated.

[0025] Preferably, the ratio of the thickness of the peripheral wall to the height of the peripheral wall is 0.5 - 0.85. It can ensure the combination of the driving portion and the workpiece or the adapter, and also ensure the strength of the main body and each force-transmitting member disposed on the main body.

[0026] To prevent the pawl from losing its working position, the receiving groove is hidden inside the main body.

[0027] In one embodiment, the profile thickness of the transition portion on the side corresponding to the support wall is greater than the profile thickness on the other side, thereby increasing the strength of the support wall.

[0028] In one embodiment, the height of the peripheral wall gradually increases from the portion away from the transition part to the portion adjacent to the transition part. In this way, the strength of the support wall is increased.

[0029] To achieve the object of the invention, another solution of the ratchet wrench of the present invention is that it includes a handle, and at least one end of the handle is configured with a ratchet working end, and it is characterized in that: the ratchet working end includes:

[0030] A main body, the main body is configured with a circular hole-shaped accommodating space and an accommodating groove, the circular hole-shaped accommodating space is defined by a peripheral wall, the accommodating groove communicates with the accommodating space and deviates from the accommodating space,

[0031] A driving member, which is rotatably arranged in the accommodating space, and the outer peripheral surface of the driving member is provided with first teeth,

[0032] A pawl, which is located in the accommodating groove and has second teeth,

[0033] An elastic element, which applies an elastic force to the pawl; and

[0034] The radial line of the accommodating groove deviates to one side of the center line of the handle. The radial line of the accommodating groove is the straight line where the center of curvature of the side wall of the accommodating groove and the center of curvature of the peripheral wall are located. The center line of the handle is the geometric center line of the handle. The radial line of the accommodating groove and the center line of the handle maintain an included angle. This solution increases the thickness of the support wall by offsetting the accommodating groove, and does not increase the specifications and contours of the main body.

[0035] For the convenience of processing, the accommodating groove is crescent-shaped. Accordingly, it can be easily completed by milling.

[0036] The center of curvature of the side wall of the accommodating groove is located on one side of the center line of the handle. The first end of the accommodating groove is adjacent to the center line of the handle, the second end of the accommodating groove is far from the center line of the handle. The first end of the accommodating groove accommodates the pawl, and the side wall of the first end of the accommodating groove serves as a support wall, and the side wall of the second end of the accommodating groove serves as a support wall for supporting the elastic element. Accordingly, a position is vacated for the support wall to deviate towards the transition part and the thickness of the support wall is ensured.

[0037] The thickness of the support wall is less than the thickness of the peripheral wall. To ensure the strength of the support wall and be able to withstand a sufficiently large torque.

[0038] Through tests, when the included angle is 5-20°, the support wall can be located at a suitable position and maintain a suitable thickness to increase the maximum torque of the ratchet wrench.

[0039] Through tests, the ratio of the included angle to the diameter of the inscribed circle of the driving member is 0.5° / mm - 2.5° / mm, which can not only arrange the support wall at a suitable position on the main body, maintain a suitable thickness to increase the maximum torque of the ratchet wrench, but also take into account the strength of other parts on the main body.

[0040] To achieve the object of the invention, the processing method of the ratchet wrench of the present invention includes precision machining a circular hole-shaped accommodation space and an accommodation groove on the main body of the working end of the ratchet. The characteristics are as follows: The circular hole-shaped accommodation space and the accommodation groove are precisely machined by numerically controlled turning and milling in one station, and the movement angle of the main shaft is controlled by a program to achieve accurate machining of the included angle. The present invention is provided with a transition part of a connecting handle on the main body of the working end of the ratchet. The accommodation groove communicates with the accommodation space and deflects from the accommodation space towards the transition part. The accommodation groove has a supporting wall. The pawl makes the second tooth engage with the first tooth by the elastic force of the elastic element and the back surface relies on the supporting wall. The ratio of the thickness of the supporting wall to the diameter of the inscribed circle of the driving part is limited to 0.2 - 1. This ratchet wrench sets the supporting wall at the transition part of the main body connecting handle instead of the peripheral wall, ensuring the thickness of the supporting wall, avoiding the formation of weak parts on the peripheral wall, and increasing the maximum torque of the ratchet wrench. Moreover, as the diameter of the inscribed circle of the driving part changes, the thickness of the supporting wall also changes to meet the requirements of different specifications of ratchet wrenches for the maximum torque.

[0041] The present invention also increases the thickness of the supporting wall without increasing the specifications and contours of the main body by deflecting the radial line of the accommodation groove to one side of the center line of the handle. The radial line of the accommodation groove is a perpendicular line passing through the geometric center of the accommodation groove and perpendicular to the axis of the circular hole-shaped accommodation space, and the center line of the handle is the geometric center line of the handle. The radial line of the accommodation groove and the center line of the handle maintain an included angle. Accordingly, the thickness of the supporting wall is increased, and the maximum torque of the ratchet wrench is increased.

[0042] The present invention precisely machines the circular hole-shaped accommodation space and the accommodation groove in the same station by numerically controlled turning and milling in one station, and the stop angle of the main shaft is controlled by a program to achieve accurate machining of the included angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a front projection schematic diagram of a perspective of the ratchet wrench according to Embodiment 1 of the present invention;

[0044] Figure 2 is Figure 1 right view;

[0045] Figure 3 is Figure 1 A - A sectional view;

[0046] Figure 4 is Figure 2 B - B sectional view;

[0047] Figure 5 is Figure 4 schematic diagram of the handle and the main body in;

[0048] Figure 6 is the structural decomposition schematic diagram of the working end of the ratchet according to Embodiment 1;

[0049] Figure 7Partial cross-sectional view of a ratchet wrench according to Embodiment 2 of the present invention from a perspective;

[0050] Figure 8 is Figure 7 Cross-sectional view taken along line C-C;

[0051] Figure 9 is Figure 7 Cross-sectional view taken along line D-D;

[0052] Figure 10 Orthographic projection schematic diagram of a ratchet wrench according to Embodiment 3 of the present invention from a perspective;

[0053] Figure 11 is Figure 10 Cross-sectional view taken along line E-E;

[0054] Figure 12 is Figure 11 Enlarged cross-sectional view taken along line F-F;

[0055] Figure 13 is Figure 11 Enlarged cross-sectional view taken along line G-G;

[0056] Figure 14 Schematic diagram of the structural decomposition of the ratchet working end of Embodiment 3;

[0057] Figure 15 Schematic diagram of the structure of the ratchet working end of Embodiment 4;

[0058] Figure 16 Schematic diagram of the structure of the ratchet working end of Embodiment 5;

[0059] Figure 17 Schematic diagram showing the relationship between the torque and the eccentric angle of an eccentric ratchet with the diameter D of the inscribed circle C of the driving member being 10 mm in a one-way ANOVA;

[0060] Figure 18 Schematic diagram showing the relationship between the torque and the eccentric angle of an eccentric ratchet with the diameter D of the inscribed circle C of the driving member being 16 mm in a one-way ANOVA;

[0061] Figure 19 Box plot of the mean life in a 100% ASME life comparison test;

[0062] Figure 20 Line graph of the mean life in a 100% ASME life comparison test;

[0063] Explanation of the reference numerals in the figure:

[0064] 100 handle, 101 shaft, center line of the n handle;

[0065] 200 ratchet working end:

[0066] 210 main body, 211 circular hole-shaped accommodation space, 212 accommodation groove, 213 first end of the accommodation groove, 214 second end of the accommodation groove, 215 peripheral wall, 216 transition part, 217 support wall, 218 supporting wall, W thickness of the peripheral wall, H height of the peripheral wall, W1 thickness of the support wall, W2 thickness of the supporting wall, r radial line of the accommodation groove, x axis of the circular hole-shaped accommodation space, α included angle between the radial line of the accommodation groove and the central line of the handle, X1 curvature center of the peripheral wall, X2 curvature center of the side wall of the accommodation groove, T thickened part

[0067] 220 driving part, 221 first tooth, 222 first working part, 223 retaining ring, β central angle corresponding to the first tooth, C inscribed circle

[0068] 230 pawl, 231 second tooth, 232 back surface

[0069] 240 elastic element

[0070] 250 support part;

[0071] 301 second working part, 302 opening Detailed implementation mode

[0072] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0073] The terms "including" and "having" in the description and claims of the present invention and any variations thereof are intended to cover non-exclusive inclusion. For example, a method or product including a series of technical features does not necessarily limit to those technical features clearly listed, but may also include other technical features that can be included in the method or product and are not clearly listed.

[0074] In the description of the present invention, it should be understood that the technical features defined by terms with sequential concepts such as "first" and "second" are only for clearly describing the defined technical features, so that the defined technical features can be clearly distinguished from other technical features, rather than being named in actual implementation, and therefore cannot be construed as a limitation to the present invention.

[0075] The present invention will be introduced in detail below in conjunction with specific embodiments and the accompanying drawings.

[0076] Embodiment 1

[0077] AsFigures 1-6 As shown, the ratchet wrench includes a handle 100 , the upper end of the handle 100 is integrally configured with a ratchet working end 200 , and the lower end of the handle 100 is integrally configured with a second working portion 301 .

[0078] The ratchet working end 200 includes a main body 210 , a driving member 220 , a pawl 230 , a supporting member 250 and an elastic element 240 .

[0079] The main body 210 is connected to the handle 100 via the transition part 216, and they are manufactured as a whole. Generally, the width of the handle is smaller than the outline of the head. The transition part is used to make the handle and the head transition smoothly to disperse the force of this part, avoid force concentration, and increase the bonding strength between the main body and the handle. The main body 210 is provided with a circular hole-shaped accommodation space 211 and an accommodation groove 212. The circular hole-shaped accommodation space 211 is defined by a peripheral wall 215. The peripheral wall 215 has a substantially uniform thickness. Figures 4-5 In the figure, the outer contour of the peripheral wall 215 at the transition part is represented by a dotted arc line. In the actual product, the outer contour is integrated with the transition part and does not reflect the outer contour of the dotted arc line. The receiving groove 212 is hidden in the main body 210. The receiving groove 212 is connected to the receiving space 211 and deviates from the receiving space to the transition part 216. The receiving groove 212 is crescent-shaped. The center of curvature X2 of the side wall of the receiving groove 212 is located on the side of the center line n of the handle, and the radial line r of the receiving groove is deviated to the side of the center line n of the handle. The radial line r of the receiving groove is a straight line where the center of curvature X2 of the side wall of the receiving groove 212 and the center of curvature X1 of the peripheral wall are located. The center line n of the handle is the geometric center line of the handle. Thus, the first end 213 of the receiving groove is adjacent to the center line n of the handle, and the second end 214 of the receiving groove is away from the center line n of the handle. The side wall of the first end of the receiving groove serves as a supporting wall 217, and the side wall of the second end of the receiving groove serves as a supporting wall 218 for supporting the elastic element. The thickness W1 of the supporting wall is not less than the thickness W of the peripheral wall, and the thickness W1 of the supporting wall is greater than the thickness W2 of the supporting wall 218. Figures 4-5 In the embodiment, the first end 213 of the receiving groove is located on the right side of the receiving groove radial line r, and the second end 214 of the receiving groove is located on the left side of the receiving groove radial line r. In other embodiments, the thickness of the supporting wall is not less than the thickness of the peripheral wall to ensure that the supporting wall provides sufficient supporting force to the pawl without being damaged.

[0080] The driving member 220 is annular, and is rotatably disposed in the accommodation space 211 through the retaining ring 223 like an axis, and the outer peripheral surface of the driving member 220 is provided with a first tooth 221, and the middle of the driving member is a sleeve-shaped first working portion 222. In other embodiments, the driving member can be a solid shaft, and the first working portion is a connecting hole or a connecting head for connecting an adapter, and the workpiece is screwed through the adapter.

[0081] In this embodiment, the pawl 230 is a wedge-shaped block. The pawl 230 is located at the first end 213 of the receiving groove and matches the shape profile of the first end 213 of the receiving groove. The pawl has a second tooth 231 and a back surface 232 facing away from the second tooth. The back surface 232 rests on the support wall 217, and the second tooth 231 of the pawl meshes with the first tooth 221 of the driving member 220.

[0082] The support member 250 is a wedge-shaped block and is located at the second end 214 of the receiving groove. Moreover, the wedge-shaped block serving as the support member matches the shape profile of the second end of the receiving groove.

[0083] The elastic element 240 is a helical compression spring. Both ends of the elastic element are respectively supported on the support member 250 and the pawl 230. By the support of the support member, an elastic force is applied to the pawl, causing the second tooth 231 of the pawl to mesh with the first tooth 221 of the driving member and causing the back surface 232 of the pawl to rest on the support wall 217. When the main body drives the driving member to rotate synchronously through the pawl ( Figure 4 rotating in the clockwise direction as shown), the support wall provides the support force F of the main body on the pawl.

[0084] In this embodiment, the ratio of the thickness W1 of the support wall to the diameter D of the inscribed circle C of the driving member is 0.2 - 1, as shown in Table 1.

[0085] Moreover, the thickness W1 of the support wall is determined by the following method: The number of engagements between the second tooth 231 and the first tooth 221 is an integer between 3 and 12, and the thickness W1 of the support wall is the average value of the thicknesses of the support walls corresponding to each second tooth. In this method, the thickness of the support wall corresponding to each engaged second tooth is generally the thickness of the support wall determined along the force application direction of each engaged second tooth. As a simplification, the value of W1 can be determined according to the minimum value of the thicknesses of the support walls corresponding to all engaged second teeth.

[0086] Moreover, the ratio of the included angle α to the diameter D of the inscribed circle C of the driving member is 0.5° / mm - 2.5° / mm, as shown in Table 1.

[0087] Table 1: Ratios of the thickness W1 of the support wall to the diameter D of the inscribed circle C of the driving member and the ratio of the included angle α to the diameter D of the inscribed circle C of the driving member for some specification ratchet wrenches

[0088]

[0089] When using the ratchet wrench, the first working portion 222 is sleeved on the workpiece, starting from Figure 4Rotate the handle 100 in the clockwise direction. The supporting wall 217 applies a supporting force F to the back surface 232 of the pawl 230, pressing the pawl 230 between the supporting wall 217 and the driving member 220. Through the engagement of the second tooth 231 of the pawl 230 with the first tooth 221 of the driving member, the driving member 220 is driven to rotate synchronously to twist the workpiece. During this period, the support member 250 rotates with the handle 100 and the driving member 220. Also, the supporting wall 217 receives the reaction force of the supporting force F. However, since the thickness W1 of the supporting wall is greater than the thickness 1 of the peripheral wall, the supporting wall can provide a sufficiently large supporting force F without being damaged (deformed or cracked). After testing, the included angle α between the radial line of the accommodating groove and the center line of the handle is 5 - 20°, and the ratio of the thickness of the peripheral wall to the height of the peripheral wall is 0.5 - 0.85, which can ensure the combination of the driving part and the workpiece or the adapter, and also ensure the strength of the main body and each force-transmitting component arranged on the main body. Conversely, the first working part 222 is sleeved on the workpiece, from Figure 4 Rotate the handle 100 in the counterclockwise direction. The supporting wall 217 has a tendency to move away from the back surface 232 of the pawl, and does not apply the supporting force F to the pawl 230. As the handle rotates, the support member 250 rotates accordingly. The pawl 230 moves between the supporting wall 217 and the driving member 220 under the elastic push of the elastic element 240, and the second tooth 231 of the pawl slides over the first tooth 221 of the driving member one by one. The handle rotates idly, and the driving member and the workpiece remain stationary.

[0090] Therefore, rotate the handle in the clockwise direction to twist the workpiece, and rotate the handle in the counterclockwise direction to reset the handle. By alternately rotating the handle in the clockwise and counterclockwise directions in this way, the workpiece can be repeatedly twisted. As Figure 4 shown by turning the ratchet wrench over, it is equivalent to Figure 4 shown by radially moving the ratchet wrench along the plane perpendicular to the paper surface, the handle can be rotated in the counterclockwise direction to twist the workpiece, and the handle can be rotated in the clockwise direction to reset the handle.

[0091] In this embodiment, the processing of the circular hole-shaped accommodating space 211 and the crescent-shaped accommodating groove 212 on the main body is the key point of the processing of this ratchet wrench. After the main body is processed, the driving member, the pawl and other components can be assembled to the main body.

[0092] The integrated handle and main body of this embodiment are processed according to the following steps: blanking - forging - polishing (or vibrating) - punching (or broaching) to form the accommodating space - finish machining the accommodating space - stamping the rod body - heat treatment - polishing (or vibrating) - surface treatment (electroplating, blackening, electrophoresis or painting, etc.) - assembly. Among them, when finish machining the accommodating space, the circular hole-shaped accommodating space 211 and the accommodating groove 212 are finish machined by numerically controlled turning and milling in one station. The movement angle of the main shaft is controlled by the program to accurately machine the included angle α. In contrast, this processing method has fewer steps, higher precision and higher efficiency.

[0093] Table 2 lists the torque test results when the diameter D of the inscribed circle C of the driving member is 10 mm, 13 mm, and 16 mm, and the crescent-shaped placement groove is eccentric by 0°, 5°, 10°, and 15°.

[0094] Table 2

[0095]

[0096]

[0097] As Figure 17 shown, when the included angle α (eccentricity) between the radial line r of the crescent-shaped placement groove and the center line n of the handle is different, the ratchet torque difference is obvious, and as the eccentricity increases, the torque increases significantly. Figure 17 Shown is to calculate the interval with the combined standard deviation and take 95% of the mean as the confidence interval. Figure 17 In it, the unit of the eccentric angle is °, and the unit of the torque is N·m.

[0098] During the test of the 16 mm product, the handle was bent yieldingly and damaged, and the product performance was restricted by the strength of the handle, so it was impossible to judge the influence of the eccentricity on the torque. For details, see Figure 18 . Figure 18 Shown is to calculate the interval with the combined standard deviation and take 95% of the mean as the confidence interval. Figure 18 In it, the unit of the eccentric angle is °, and the unit of the torque is N·m. From Figures 19-20 shown, through the 100% ASME life test, the life when the included angle α (eccentricity) between the radial line r of the crescent-shaped placement groove and the center line n of the handle is 15° is significantly better than the life when the eccentricity is 0°. Figure 20 In it, the dashed line represents the life with an eccentricity of 15°, and the dashed line represents the life with an eccentricity of 0°. Figures 19-20 In it, the unit of the eccentricity is °, and the unit of the life is times.

[0099] Among them, when the included angle α (eccentricity) is 0°, it is equivalent to that the crescent-shaped placement groove is symmetric with respect to the center line n of the handle. The included angle α in the present invention is greater than 0°.

[0100] Example 2

[0101] As Figures 7-9 shown, the difference between this ratchet wrench and Example 1 is that:

[0102] The support member 250 is a rod fixed to the second end of the placement groove. The support member can be fixed to the placement groove by welding, plugging, etc. One end of the spiral compression spring as an elastic element is sleeved on the rod.

[0103] Moreover, there are two pawls 230, and each pawl is provided with a corresponding support member 250 and elastic element 240. The two pawls 230 are axially stacked along the accommodation space. When the second tooth 231 of one pawl meshes with the first tooth 221 as shown in Figure 8 , the second tooth 231 of the other pawl meshes with the first tooth 221 at a reverse angle of β / 2 as shown in Figure 9 . Here, β is the central angle corresponding to one first tooth. In this embodiment, the central angle corresponding to one first tooth is 5°. Accordingly, when turning the workpiece, the handle only needs to be reversely rotated by a reverse angle of 2.5° to make the second tooth of the other pawl mesh with the first tooth, achieving the effect of 144 first teeth with 72 first teeth of the driving member and being able to maintain the size of the first teeth.

[0104] In addition, in this embodiment, the lower end of the handle is provided with an opening for turning the workpiece.

[0105] The rest of the structure of this ratchet wrench is the same as that of the ratchet wrench in Embodiment 1 and will not be elaborated here.

[0106] Embodiment 3

[0107] As shown in Figures 10-14 , the difference between this ratchet wrench and that in Embodiment 1 is that:

[0108] The transition part 216 and the handle 100 are connected by a shaft 101. Therefore, the working end of the ratchet can be rotated around the shaft to adjust its attitude relative to the handle.

[0109] In this embodiment, there are two pawls 230, and each pawl 230 is provided with a corresponding support member 250 and elastic element 240. The two pawls are axially stacked along the accommodation space. When the second tooth 231 of one pawl meshes with the first tooth 221 as shown in Figure 12 , the second tooth of the other pawl meshes with the first tooth 221 at a reverse angle of β / 2 as shown in Figure 13 . Here, β is the central angle corresponding to one first tooth. In this embodiment, the central angle corresponding to one first tooth is 5°. Accordingly, when turning the workpiece, the handle only needs to be reversely rotated by a reverse angle of 2.5° to make the second tooth of the other pawl mesh with the first tooth, achieving the effect of 144 first teeth with 72 first teeth of the driving member and being able to keep the first teeth with a larger profile to transmit a larger torque.

[0110] In order to apply an elastic force to the pawls, one elastic element is configured for each pawl, and the two elastic elements are jointly supported on the same wedge-shaped block as the support member.

[0111] The rest of the structure of this ratchet wrench is the same as that of the ratchet wrench in Embodiment 1 and will not be elaborated here.

[0112] In Embodiment 2 and Embodiment 3, the number of pawls can be three. The three pawls are stacked along the axial direction of the accommodating space. When the second tooth of any one pawl meshes with the first tooth, the second tooth of another pawl meshes with the first tooth while maintaining a reverse angle of β / 3, where β is the central angle corresponding to one first tooth. For example, if the driving member is evenly provided with 60 first teeth, the central angle corresponding to one first tooth is 6°. When turning the workpiece, the handle only needs to be reversely rotated by a reverse angle of 2° to make the second tooth of another pawl mesh with the first tooth. This enables the 60 first teeth of the driving member to achieve the effect of 180 first teeth, and can make the first teeth maintain a larger profile to transmit a larger torque.

[0113] In addition, in this embodiment, no opening or socket hole for turning the workpiece is provided at the lower end of the handle.

[0114] The remaining structure of this ratchet wrench is the same as that of the ratchet wrench in Embodiment 1 and will not be elaborated.

[0115] Embodiment 4

[0116] As Figure 15 shown, the difference between this ratchet wrench and the ratchet wrench in Embodiment 1 is that: the profile thickness of the transition part 216 on the side corresponding to the supporting wall is greater than the profile thickness on the other side, making the profile of the transition part asymmetric. In the figure, the symmetry line of the left edge of the transition part on the right is represented by a dotted line, and the thickened part T on the right is represented by shading, thereby increasing the strength of the supporting wall to increase the maximum torque of the ratchet wrench.

[0117] The remaining structure of this ratchet wrench is the same as that of the ratchet wrench in Embodiment 1 and will not be elaborated.

[0118] Embodiment 5

[0119] As Figure 16 shown, the difference between this ratchet wrench and the ratchet wrench in Embodiment 1 is that: the height H of the peripheral wall 215 gradually increases from the part away from the transition part to the part adjacent to the transition part. Accordingly, an angle θ is maintained between the end face of the peripheral wall 215 and the center line of the handle, thereby increasing the strength of the supporting wall to increase the maximum torque of the ratchet wrench. The remaining structure of this ratchet wrench is the same as that of the ratchet wrench in Embodiment 1 and will not be elaborated.

Claims

1. Ratchet wrench, comprising a handle (100), at least one end of the handle is configured with a ratchet working end (200), characterized in that: The working end of the ratchet includes: A main body (210), the main body is configured with a circular hole-shaped accommodating space (211) and an accommodating groove (212), the circular hole-shaped accommodating space is defined by a peripheral wall (215), A driving member (220), which is rotatably arranged in the accommodating space (211), and a first tooth (221) is provided on the outer peripheral surface of the driving member, A pawl (230), which is located in the accommodating groove (212) and has a second tooth (231), An elastic element (240), which applies an elastic force to the pawl; and The main body has a transition portion (216) of a connecting handle, the accommodating groove (212) is located in the transition portion (216) and communicates with the accommodating space (211), the accommodating groove has a supporting wall (217), and the pawl (230) tends to be between the second tooth (231) and the supporting wall (217) by the elastic force of the elastic element (240). The ratio of the thickness (W1) of the supporting wall to the diameter (D) of the inscribed circle (C) of the driving member is 0.2-1. When the main body drives the driving member to rotate synchronously through the pawl, the supporting wall provides the supporting force of the main body on the pawl.

2. The ratchet wrench according to claim 1, characterized in that: The number of engagements between the second tooth (231) and the first tooth (221) is an integer between 3 and 12, and the thickness (W1) of the supporting wall is the average value of the thicknesses of the supporting walls corresponding to each second tooth.

3. The ratchet wrench according to claim 1, wherein: The thickness (W1) of the supporting wall is not less than the thickness (W) of the peripheral wall.

4. The ratchet wrench according to any one of claims 1-3, characterized in that: The radial line (r) of the accommodating groove is biased to one side of the center line (n) of the handle. The radial line (r) of the accommodating groove is the straight line where the curvature center (X2) of the side wall of the accommodating groove (212) and the curvature center (X1) of the peripheral wall are located. The center line (n) of the handle is the geometric center line of the handle. The radial line (r) of the accommodating groove and the center line (n) of the handle maintain an included angle (α).

5. The ratchet wrench according to claim 4, characterized in that: The included angle is 5-20°.

6. The ratchet wrench according to claim 4, wherein: The ratio of the included angle (α) to the diameter (D) of the inscribed circle (C) of the driving member is 0.5° / mm - 2.5° / mm.

7. The ratchet wrench according to claim 4, characterized in that: The accommodating groove (212) is crescent-shaped. The curvature center (X2) of the side wall of the accommodating groove (212) is located on one side of the center line (n) of the handle. The first end (213) of the accommodating groove is adjacent to the center line (n) of the handle, and the second end (214) of the accommodating groove is far from the center line (n) of the handle. The first end (213) of the accommodating groove accommodates the pawl (230). The side wall of the first end (213) of the accommodating groove serves as the supporting wall (217), and the side wall of the second end (214) of the accommodating groove serves as the supporting wall (218) for supporting the elastic element.

8. The ratchet wrench according to claim 7, characterized in that: The thickness (W2) of the supporting wall is less than the thickness (W1) of the supporting wall.

9. The ratchet wrench according to claim 7, characterized in that: A support member (250) is arranged at the second end (214) of the accommodating groove. The elastic element (240) applies an elastic force to the pawl (230) through the support of the support member (250).

10. The ratchet wrench according to claim 9, characterized in that: The pawl (230) is a wedge block, and the wedge block matches the shape profile of the first end (213) of the accommodating groove.

11. The ratchet wrench according to claim 9, characterized in that: The support member (250) is a wedge block, and the wedge block matches the shape profile of the second end (214) of the accommodating groove.

12. The ratchet wrench according to claim 9, wherein: The support member (250) is a rod fixed to the second end of the accommodating groove (212).

13. The ratchet wrench according to any one of claims 1-3, characterized in that: There are n pawls (230), where n is 2 or 3, and the n pawls are stacked axially along the accommodation space. When the second tooth of any one pawl meshes with the first tooth, the second tooth of another pawl meshes with the first tooth while maintaining a reverse angle of β / n, and β is the central angle corresponding to one first tooth.

14. The ratchet wrench according to any one of claims 1 to 3, characterized in that: The transition part (216) is integrally connected with the handle (100).

15. The ratchet wrench according to any one of claims 1-3, characterized in that: The transition part (216) is connected to the handle (100) via the shaft (101).

16. The ratchet wrench according to any one of claims 1-3, characterized in that: The ratio of the thickness (W) of the peripheral wall to the height (H) of the peripheral wall is 0.5 - 0.

85.

17. The ratchet wrench according to any one of claims 1-3, characterized in that: The accommodation groove (212) is hidden inside the main body (210).

18. The ratchet wrench according to any one of claims 1 to 3, characterized in that: The contour thickness of the transition part (216) on the side corresponding to the support wall is greater than the contour thickness on the other side.

19. The ratchet wrench according to any one of claims 1-3, characterized in that: The height (H) of the peripheral wall (215) gradually increases from the part far away from the transition part to the part adjacent to the transition part.

20. Ratchet wrench, comprising a handle (100), at least one end of the handle is configured with a ratchet working end (200), characterized in that: The working end of the ratchet includes: A main body (210), which is configured with a circular hole-shaped accommodation space (211) and an accommodation groove (212). The circular hole-shaped accommodation space is defined by a peripheral wall (215), and the accommodation groove (212) communicates with the accommodation space (211) and deviates from the accommodation space. A driving member (220), which is rotatably arranged inside the accommodation space (211), and the outer peripheral surface of the driving member is provided with first teeth (221). Pawls (230), which are located inside the accommodation groove (212) and have second teeth (231). An elastic element (240), which applies an elastic force to the pawls; and The radial line (r) of the accommodation groove deviates to one side of the center line (n) of the handle. The radial line (r) of the accommodation groove is the straight line where the curvature center (X2) of the side wall of the accommodation groove (212) and the curvature center (X1) of the peripheral wall are located. The center line (n) of the handle is the geometric center line of the handle, and the radial line (r) of the accommodation groove and the center line (n) of the handle maintain an included angle (α).

21. The ratchet wrench according to claim 20, wherein: The accommodation groove (212) is crescent-shaped.

22. The ratchet wrench according to claim 21, characterized in that: The curvature center (X2) of the side wall of the accommodation groove (212) is located on one side of the center line (n) of the handle. The first end (213) of the accommodation groove is adjacent to the center line (n) of the handle, and the second end (214) of the accommodation groove is far away from the center line (n) of the handle. The first end (213) of the accommodation groove accommodates the pawl (230), and the side wall of the first end (213) of the accommodation groove serves as the support wall (217). The side wall of the second end (214) of the accommodation groove serves as the support wall (218) for supporting the elastic element.

23. The ratchet wrench according to any one of claims 20-22, characterized in that: The included angle (α) is 5 - 20°.

24. The ratchet wrench according to any one of claims 20-22, characterized in that: The ratio of the included angle (α) to the diameter (D) of the inscribed circle (C) of the driving member is 0.5° / mm - 2.5° / mm.

25. The processing method of a ratchet wrench, including finely machining a circular hole-shaped accommodating space (211) and an accommodating groove (212) on the main body (210) at the working end of the ratchet, is characterized in that: The circular hole-shaped accommodation space (211) and the accommodation groove (212) are finely processed by numerically controlled turning and milling integrated machining at the same station, and the movement angle of the main shaft is controlled by a program to achieve accurate machining of the included angle (α).

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