Ratchet mechanism

Abstract

The utility model provides a ratchet mechanism which comprises a ratchet assembly, a ratchet wheel assembly, a ratchet wheel assembly and a ratchet wheel assembly. The pawl assembly comprises a pawl, a V-shaped elastic piece and a pawl shaft sleeve, the ratchet shaft sleeve is arranged on the pawl shaft sleeve in a sleeving mode, a first embedding groove is formed in the pawl shaft sleeve, a second embedding groove is formed in the pawl, the second embedding groove extends from the first end of the pawl to the second end of the pawl, one end of the V-shaped elastic piece is embedded into the first embedding groove, and the other end of the V-shaped elastic piece is embedded into the second embedding groove. The other end of the V-shaped elastic piece is embedded into the second embedding groove, the first end of the pawl abuts against the pawl shaft sleeve, and the second end of the pawl abuts against the ratchet wheel groove under the elastic force effect of the V-shaped elastic piece. The single pawl is elastically connected with the ratchet wheel shaft sleeve through the independent V-shaped elastic piece, so that the elastic connection effect of the pawl and the ratchet wheel is good. One end of the V-shaped elastic piece is embedded into the first embedding groove of the pawl shaft sleeve, the other end of the V-shaped elastic piece is embedded into the second embedding groove of the pawl, and installation of the V-shaped elastic piece and the pawl is facilitated.

Description

Technical Field

[0001] The present application relates to the field of ratchets, and in particular to a ratchet mechanism. Background Art

[0002] The ratchet mechanism is a specific component in a mechanical device, which can be used in fields such as mechanical clocks, vehicle engines, aerospace, and industrial production. The ratchet mechanism can transmit torque in mechanical equipment. Ratchet mechanisms are generally divided into two types: external meshing ratchet mechanisms and internal meshing ratchet mechanisms. The structure of the external meshing ratchet mechanism is generally more complex, while the internal meshing ratchet mechanism mainly consists of a ratchet and a pawl, and the structure is relatively simple. The internal meshing ratchet mechanism generally uses a spring to elastically connect a single pawl to the ratchet, and the pre-compressed spring makes the pawl difficult to install. The internal meshing ratchet mechanism can also use a C-shaped retaining ring to elastically connect all pawls to the ratchet, but its elastic connection effect is inferior to that of an independent spring. Summary of the Invention

[0003] The present application provides a ratchet mechanism to solve the problems of difficult installation and poor elastic connection between the pawl and the ratchet of the ratchet mechanism. The technical solution is as follows:

[0004] An embodiment of the present application provides a ratchet mechanism, comprising:

[0005] A ratchet assembly, the ratchet assembly comprising a ratchet sleeve, the inner wall of which is provided with a circle of ratchet grooves;

[0006] The pawl assembly includes a pawl, a V-shaped spring piece and a pawl sleeve, the ratchet sleeve is sleeved on the pawl sleeve, the pawl is located between the pawl sleeve and the ratchet sleeve, the pawl sleeve is provided with a first embedding groove, the pawl is provided with a second embedding groove, the pawl has a first end and a second end, the second embedding groove extends from the first end of the pawl to the second end of the pawl, one end of the V-shaped spring piece is embedded in the first embedding groove, the other end of the V-shaped spring piece is embedded in the second embedding groove, the first end of the pawl is against the pawl sleeve, and the second end of the pawl is against the ratchet groove under the elastic force of the V-shaped spring piece.

[0007] In one embodiment, the cross section of the ratchet groove is in the shape of a barb, and the opening of the ratchet groove faces the rotation direction of the ratchet sleeve.

[0008] In one embodiment, a conformal groove adapted to the first end of the pawl is formed on the outer circumference of the pawl sleeve, the first end of the pawl is located in the conformal groove, and the first end of the pawl can rotate in the conformal groove.

[0009] In one embodiment, the ratchet mechanism is used to connect to the first connecting shaft and the second connecting shaft, one end of the first connecting shaft is detachably connected to the pawl sleeve, and one end of the second connecting shaft is detachably connected to the ratchet sleeve.

[0010] In one embodiment, a first groove is provided at one end of the connecting shaft, a first convex portion is provided inside the pawl sleeve, and the first convex portion matches the first groove; a second groove is provided at one end of the connecting two shafts, a second convex portion is provided on the ratchet sleeve, and the second convex portion matches the second groove.

[0011] In one embodiment, a first top screw and a first top screw threaded hole are provided on the pawl sleeve, one end of the connecting shaft is inserted into the pawl sleeve, and one end of the first top screw passes through the first top screw threaded hole and then abuts against the connecting shaft; a second top screw and a second top screw threaded hole are provided on the ratchet sleeve, one end of the connecting two shafts is inserted into the ratchet sleeve, and one end of the second top screw passes through the second top screw threaded hole and then abuts against the connecting two shafts.

[0012] In one embodiment, the ratchet assembly further includes a ratchet shaft cover and a sealing ring, the ratchet shaft cover is sleeved on the pawl shaft sleeve, a sealing groove is provided on the lower surface of the ratchet shaft cover, the sealing ring is located in the sealing groove, and the ratchet shaft cover is sealed and connected to the upper surface of the ratchet shaft sleeve through the sealing ring.

[0013] In one embodiment, the ratchet assembly also includes a fastening bolt, a bolt through hole is provided on the ratchet shaft cover, and a corresponding bolt threaded hole is provided on the ratchet shaft sleeve. One end of the fastening bolt passes through the bolt through hole on the ratchet shaft cover and is threadedly connected to the corresponding bolt threaded hole on the ratchet shaft sleeve.

[0014] In one embodiment, the ratchet shaft cover is provided with an oil filling hole and an exhaust hole which pass through the ratchet shaft cover from top to bottom. The oil filling hole and the exhaust hole are located in the inner circle of the sealing groove, and the oil filling hole and the exhaust hole are located between the inner wall of the ratchet shaft sleeve and the inner wall of the pawl shaft sleeve.

[0015] In one embodiment, the cross-section of the pawl is whistle-shaped.

[0016] The advantages or beneficial effects of the above technical solution include at least:

[0017] The ratchet mechanism of the embodiment of the present application includes a ratchet assembly and a pawl assembly, wherein the ratchet assembly includes a ratchet sleeve, the inner wall of which is provided with a circle of ratchet grooves, and the pawl assembly includes a pawl, a V-shaped spring clip, and a pawl sleeve. The pawl sleeve is provided with a first embedding groove, and the pawl is provided with a second embedding groove. One end of the V-shaped spring clip is embedded in the first embedding groove, and the other end of the V-shaped spring clip is embedded in the second embedding groove. The first end of the pawl abuts against the pawl sleeve, and the second end of the pawl abuts against the ratchet groove under the elastic force of the V-shaped spring clip. The single pawl of the embodiment of the present application uses an independent V-shaped spring clip to achieve an elastic connection with the ratchet sleeve, so that the elastic connection between the pawl and the ratchet is effective. One end of the V-shaped spring clip is embedded in the first embedding groove of the pawl sleeve, and the other end of the V-shaped spring clip is embedded in the second embedding groove of the pawl, which facilitates the installation of the V-shaped spring clip and the pawl.

[0018] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present application will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0020] Figure 1 It is a schematic diagram of the structure of the ratchet mechanism, the connecting shaft 1, and the connecting shaft 2;

[0021] Figure 2 This is an exploded diagram of the ratchet mechanism;

[0022] Figure 3 Schematic diagram of the structure of the pawl assembly;

[0023] Figure 4 is a schematic structural diagram of a ratchet assembly;

[0024] Figure 5 It is a transverse cross-sectional view of the ratchet mechanism;

[0025] Figure 6 It is a longitudinal cross-sectional view of the ratchet mechanism;

[0026] Figure 7 It is a schematic diagram of the combination of the ratchet shaft cover and the pawl assembly;

[0027] Figure 8 It is a schematic diagram of the structure of the ratchet shaft cover and the sealing ring;

[0028] Figure 9 This is a cross-sectional view of the ratchet hub connected to the connecting shaft;

[0029] Description of reference numerals:

[0030] 1. Ratchet assembly; 2. Pawl assembly; 11. Ratchet shaft sleeve; 12. Ratchet groove; 21. Pawl; 211. First end; 212. Second end; 22. V-shaped spring; 23. Pawl shaft sleeve; 24. First embedded groove; 25. Second embedded groove; 26. Conformal groove; 13. Ratchet shaft cover; 14. Sealing ring; 15. Sealing groove; 16. Bolt threaded hole; 17. Fastening bolt; 131. Bolt through hole; 1 8. Oil filling hole; 19. Exhaust hole; 3. Connect one shaft; 4. Connect two shafts; 231. First cylinder; 232. Second cylinder; 31. First groove; 233. First convex portion; 234. First top screw; 235. First top screw threaded hole; 111. Third cylinder; 112. Fourth cylinder; 41. Second groove; 113. Second convex portion; 114. Second top screw; 115. Second top screw threaded hole. DETAILED DESCRIPTION

[0031] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present application. Therefore, the drawings and description are to be regarded as illustrative in nature and not restrictive.

[0032] like Figures 1 to 9 As shown, an embodiment of the present application provides a ratchet mechanism, including a ratchet assembly 1 and a pawl assembly 2. The ratchet assembly 1 includes a ratchet sleeve 11, and a circle of ratchet grooves 12 are provided on the inner wall of the ratchet sleeve 11. The pawl assembly 2 includes a pawl 21, a V-shaped spring piece 22 and a pawl sleeve 23. The ratchet sleeve 11 is sleeved on the pawl sleeve 23, and the pawl 21 is located between the pawl sleeve 23 and the ratchet sleeve 11. A first embedding groove 24 is provided on the pawl sleeve 23, and a second embedding groove 25 is provided on the pawl 21. The pawl 21 has a first end 211 and a second end 212. The second embedding groove 25 extends from the first end 211 of the pawl 21 to the second end 212 of the pawl 21. One end of the V-shaped spring piece 22 is embedded in the first embedding groove 24, and the other end of the V-shaped spring piece 22 is embedded in the second embedding groove 25. The first end portion 211 of the pawl 21 abuts against the pawl sleeve 23 , and the second end portion 212 of the pawl 21 abuts against the ratchet groove 12 under the elastic force of the V-shaped spring piece 22 .

[0033] The single pawl 21 of the present embodiment utilizes a separate V-shaped spring clip 22 to achieve an elastic connection with the ratchet hub 11, effectively achieving an elastic connection between the pawl 21 and the ratchet. One end of the V-shaped spring clip 22 is embedded in a first embedding groove 24 of the pawl hub 23, while the other end of the V-shaped spring clip 22 is embedded in a second embedding groove 25 of the pawl 21, facilitating installation of the V-shaped spring clip 22 and pawl 21.

[0034] In one embodiment, the number of the pawls 21 and the V-shaped spring pieces 22 can be one or more, for example, two, three or four, etc. The plurality of pawls 21 are arranged at intervals on the outer circumference of the pawl sleeve 23 .

[0035] In one embodiment, the pawl 21 has a whistle-shaped cross-section, and the second insertion groove 25 extends from the whistle-shaped head to the whistle-shaped tail. The V-shaped spring piece 22 is inserted from the whistle-shaped head into the whistle-shaped tail. As the V-shaped spring piece 22 is inserted into the pawl 21, the tension of the V-shaped spring piece 22 causes the whistle-shaped tail to press against the ratchet groove 12.

[0036] In order to realize the connection between the pawl 21 and the pawl sleeve 23, a conformal groove 26 adapted to the first end 211 of the pawl 21 is opened on the outer peripheral surface of the pawl sleeve 23. The first end 211 of the pawl 21 is located in the conformal groove 26, and the first end 211 of the pawl 21 can rotate in the conformal groove 26.

[0037] In one embodiment, the ratchet groove 12 has a barbed cross-section, with its opening facing the direction of rotation of the ratchet sleeve 11. Because the first end 211 of the pawl 21 is located within the conformal groove 26 and the ratchet groove 12 has a barbed cross-section, when the rotational speed of the ratchet sleeve 11 is higher than that of the pawl 21, the ratchet sleeve 11 can push the pawl 21 to rotate; when the rotational speed of the ratchet sleeve 11 is lower than that of the pawl 21, the pawl 21 can slide relative to the ratchet sleeve 11, continuously sliding out of the current ratchet groove 12 and into the next ratchet groove 12.

[0038] In one embodiment, the ratchet assembly 1 further includes a ratchet shaft cover 13 and a sealing ring 14. The ratchet shaft cover 13 is sleeved onto the pawl shaft sleeve 23 and is positioned above the pawl 21. A sealing groove 15 is defined on the lower surface of the ratchet shaft cover 13, and the sealing ring 14 is positioned within the sealing groove 15. The ratchet shaft cover 13 is sealed to the upper surface of the ratchet shaft sleeve 11 via the sealing ring 14. Preferably, the sealing ring 14 is positioned outside the pawl 21, thereby sealing the pawl 21.

[0039] To achieve the connection between the ratchet shaft cover 13 and the ratchet shaft sleeve 11, the ratchet assembly 1 also includes a fastening bolt 17. The ratchet shaft cover 13 is provided with a bolt through-hole 131, and the ratchet shaft sleeve 11 is provided with a corresponding bolt threaded hole 16. One end of the fastening bolt 17 passes through the bolt through-hole 131 in the ratchet shaft cover 13 and is threadedly connected to the corresponding bolt threaded hole 16 in the ratchet shaft sleeve 11. In this embodiment, the sealing ring 14 and the fastening bolt 17 can ensure a more secure fixation between the ratchet shaft sleeve 11 and the ratchet shaft cover 13, and can achieve a seal between the ratchet shaft sleeve 11 and the ratchet shaft cover 13. Preferably, the number of fastening bolts 17 can be one or more, for example, the number of fastening bolts 17 can be two, three, or four.

[0040] In one embodiment, to facilitate lubrication of the ratchet mechanism, an oil filling hole 18 and an exhaust hole 19 are formed on the ratchet shaft cover 13, extending vertically through the ratchet shaft cover 13. The oil filling hole 18 and the exhaust hole 19 are located on the inner circle of the sealing groove 15 and between the inner wall of the ratchet shaft sleeve 11 and the inner wall of the pawl shaft sleeve 23. The oil filling hole 18 facilitates lubrication, while the exhaust hole 19 facilitates the exhaust of air.

[0041] In one embodiment, the ratchet mechanism is used to connect with the first connecting shaft 3 and the second connecting shaft 4. One end of the first connecting shaft 3 is detachably connected to the pawl sleeve 23, and one end of the second connecting shaft 4 is detachably connected to the ratchet sleeve 11.

[0042] In order to achieve a detachable connection between the connecting shaft 3 and the pawl sleeve 23, the pawl sleeve 23 includes a first cylinder 231 and a second cylinder 232. The diameter of the first cylinder 231 is smaller than the diameter of the second cylinder 232, and the bottom of the first cylinder 231 is connected to the top of the second cylinder 232. The first cylinder 231 and the second cylinder 232 are connected to form a cylindrical step structure. One end of the connecting shaft 3 is provided with a first groove 31. The interior of the first cylinder 231 is a hollow structure. The bottom of the first cylinder 231 is provided with a first protrusion 232 protruding toward the middle of the first cylinder 231. The first protrusion 232 matches the first groove 31. When connecting the connecting shaft 2 to the pawl sleeve 23, one end of the connecting shaft 3 is inserted into the interior of the first cylinder 231, and the first protrusion 232 is inserted into the first groove 31.

[0043] After the connecting shaft 3 is inserted into the pawl sleeve 23, a first push screw 234 and a first push screw threaded hole 235 are provided on the first cylindrical body 231 to further secure the connecting shaft 3 and the pawl sleeve 23. One end of the connecting shaft 3 is inserted into the pawl sleeve 23, and one end of the first push screw 234 passes through the first push screw threaded hole 235 and abuts against the connecting shaft 3, thereby securing the connecting shaft 3. The number of first push screws 234 and first push screw threaded holes 235 can be one or more, for example, two, three, or four. Multiple first push screws 234 and multiple first push screw threaded holes 235 can be spaced apart along the outer circumference of the first cylindrical body 231.

[0044] In order to achieve a detachable connection between the connecting shaft 4 and the ratchet sleeve 11, the ratchet sleeve 11 includes a third cylinder 111 and a fourth cylinder 112. The diameter of the fourth cylinder 112 is smaller than that of the third cylinder 111, and the bottom of the third cylinder 111 is connected to the top of the fourth cylinder 112. After the third cylinder 111 and the fourth cylinder 112 are connected, a cylindrical step structure is formed, and the interior of the fourth cylinder 112 is a hollow structure. One end of the connecting shaft 4 is provided with a second groove 41, and the top of the fourth cylinder 112 is provided with a second protrusion 113 protruding toward the middle of the fourth cylinder 112. The second protrusion 113 matches the second groove 41. When connecting the connecting shaft 4 to the ratchet sleeve 11, one end of the connecting shaft 4 is inserted into the interior of the fourth cylinder 112, and the second protrusion 113 is inserted into the interior of the second groove 41. The ratchet 21 and the V-shaped spring piece 22 are connected to the second cylindrical body 232 , and the ratchet groove 12 is located on the fourth cylindrical body 112 .

[0045] After the connecting shaft 4 is inserted into the fourth cylindrical body 112, a second jackscrew 114 and a second jackscrew threaded hole 115 are provided on the fourth cylindrical body 112 to further secure the connecting shaft 4 to the ratchet sleeve 11. One end of the connecting shaft 4 is inserted into the ratchet sleeve 11, and one end of the second jackscrew 114 passes through the second jackscrew threaded hole 115 and abuts against the connecting shaft 4, thereby securing the connecting shaft 4. The number of second jackscrews 114 and second jackscrew threaded holes 115 can be one or more, for example, two, three, or four, etc. Multiple second jackscrews 114 and multiple second jackscrew threaded holes 115 can be spaced apart along the outer circumference of the fourth cylindrical body 112.

[0046] In the ratchet mechanism of the embodiment of the present application, when the rotational speed of the ratchet assembly 1 is higher than the rotational speed of the pawl assembly 2, the ratchet assembly 1 pushes the pawl assembly 2 to rotate. Specifically, the connecting shaft 4 is inserted into the ratchet sleeve 11, and the second protrusion 113 cooperates with the second groove 41 to transmit torque. When the rotational speed of the connecting shaft 4 is higher than the rotational speed of the pawl 21, the ratchet sleeve 11 is provided with a ratchet groove 12 in the shape of a barb. The pawl 21 is pressed against the ratchet groove 12 under the elastic force of the V-shaped spring piece 22, and the ratchet sleeve 11 pushes the pawl 21 to rotate. Since the first end 211 of the pawl 21 is located in the conformal groove 26, when the pawl 21 rotates, it pushes the pawl sleeve 23 to rotate, and the pawl sleeve 23 drives the connecting shaft 3 to rotate.

[0047] When the speed of the ratchet assembly 1 is lower than that of the pawl assembly 2, the ratchet assembly 1 slides relative to the pawl assembly 2. Specifically, the connecting shaft 4 drives the ratchet sleeve 11 to rotate. The ratchet sleeve 11 is provided with a barbed ratchet groove 12. Because the V-shaped spring 22 is compressible and the speed of the pawl 21 is higher than that of the ratchet sleeve 11, the pawl 21 will continuously slide out of the opening of the current ratchet groove 12 and into the next ratchet groove 12, sliding relative to the ratchet sleeve 11. Because the connecting shaft 3 is connected to the pawl sleeve 23, the connecting shaft 3 drives the pawl sleeve 23 to rotate.

[0048] The working principle of the ratchet mechanism of this application is as follows:

[0049] When the speed of the second connecting shaft 4 is higher than that of the first connecting shaft 3, the ratchet mechanism is in the connected state. The second connecting shaft 4 drives the ratchet sleeve 11 to rotate, which in turn drives the pawl sleeve 23 through the pawl 21, thereby driving the first connecting shaft 3 to rotate, completing the power transmission between the second connecting shaft 4 and the first connecting shaft 3.

[0050] When the speed of the second connecting shaft 4 is lower than that of the first connecting shaft 3, the ratchet mechanism is in a sliding state. The ratchet sleeve 11 and the pawl 21 slide relative to each other, and the ratchet mechanism disconnects the power transmission between the second connecting shaft 4 and the first connecting shaft 3, and the first connecting shaft 3 is in a free rotation state.

[0051] In the description of this specification, the reference terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification, as well as features of different embodiments or examples, unless they are mutually inconsistent.

[0052] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0053] The above are only specific embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various modifications or substitutions within the technical scope disclosed in this application, and such modifications or substitutions should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A ratchet mechanism, characterized in that: include: A ratchet assembly, the ratchet assembly comprising a ratchet sleeve, the inner wall of which is provided with a circle of ratchet grooves; The pawl assembly includes a pawl, a V-shaped spring piece and a pawl sleeve, the ratchet sleeve is sleeved on the pawl sleeve, the pawl is located between the pawl sleeve and the ratchet sleeve, the pawl sleeve is provided with a first embedding groove, the pawl is provided with a second embedding groove, the pawl has a first end and a second end, the second embedding groove extends from the first end of the pawl to the second end of the pawl, one end of the V-shaped spring piece is embedded in the first embedding groove, the other end of the V-shaped spring piece is embedded in the second embedding groove, the first end of the pawl is against the pawl sleeve, and the second end of the pawl is against the ratchet groove under the elastic force of the V-shaped spring piece.

2. The ratchet mechanism according to claim 1, wherein: The cross section of the ratchet groove is in the shape of a barb, and the opening of the ratchet groove faces the rotation direction of the ratchet sleeve.

3. The ratchet mechanism according to claim 1, wherein: A conformal groove adapted to the first end of the pawl is formed on the outer circumferential surface of the pawl sleeve. The first end of the pawl is located in the conformal groove and can rotate in the conformal groove.

4. The ratchet mechanism according to any one of claims 1 to 3, characterized in that: The ratchet mechanism is used to connect with the first connecting shaft and the second connecting shaft. One end of the first connecting shaft is detachably connected to the pawl sleeve, and one end of the second connecting shaft is detachably connected to the ratchet sleeve.

5. The ratchet mechanism according to claim 4, characterized in that: One end of the connecting shaft is provided with a first groove, and the inside of the pawl sleeve is provided with a first convex portion, and the first convex portion matches the first groove; one end of the connecting two shafts is provided with a second groove, and the ratchet sleeve is provided with a second convex portion, and the second convex portion matches the second groove.

6. The ratchet mechanism according to claim 5, characterized in that: The pawl shaft sleeve is provided with a first top screw and a first top screw threaded hole, one end of the connecting shaft is inserted into the pawl shaft sleeve, and one end of the first top screw passes through the first top screw threaded hole and then abuts against the connecting shaft; the ratchet shaft sleeve is provided with a second top screw and a second top screw threaded hole, one end of the connecting two shafts is inserted into the ratchet shaft sleeve, and one end of the second top screw passes through the second top screw threaded hole and then abuts against the connecting two shafts.

7. The ratchet mechanism according to any one of claims 1 to 3, characterized in that: The ratchet assembly also includes a ratchet shaft cover and a sealing ring. The ratchet shaft cover is sleeved on the pawl shaft sleeve. A sealing groove is provided on the lower surface of the ratchet shaft cover. The sealing ring is located in the sealing groove. The ratchet shaft cover is sealed and connected to the upper surface of the ratchet shaft sleeve through the sealing ring.

8. The ratchet mechanism according to claim 7, wherein: The ratchet assembly also includes a fastening bolt, a bolt through hole is provided on the ratchet shaft cover, and a corresponding bolt threaded hole is provided on the ratchet shaft sleeve. One end of the fastening bolt passes through the bolt through hole on the ratchet shaft cover and is threadedly connected with the corresponding bolt threaded hole on the ratchet shaft sleeve.

9. The ratchet mechanism according to claim 7, wherein: The ratchet shaft cover is provided with an oil filling hole and an exhaust hole which pass through the ratchet shaft cover from top to bottom. The oil filling hole and the exhaust hole are located in the inner circle of the sealing groove, and are located between the inner wall of the ratchet shaft sleeve and the inner wall of the pawl shaft sleeve.

10. The ratchet mechanism according to any one of claims 1 to 3, characterized in that: The cross section of the pawl is in the shape of a whistle.

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