Locking mechanism and gearbox

Abstract

The locking mechanism comprises an outer ring and an inner ring, the outer ring is sleeved on the inner ring, a retainer is arranged between the outer ring and the inner ring, a plurality of positioning columns are arranged on the retainer, pin roller grooves are formed among the adjacent positioning columns, the outer ring and the inner ring, and rolling columns are arranged in the pin roller grooves. The rolling columns contact the outer ring and the inner ring simultaneously. Protruding blocks are arranged on the outer surface of the inner ring and located between the adjacent rolling columns, a first through hole is formed in the middle of the retainer, the locking mechanism further comprises a connecting shaft, and the connecting shaft is connected into the first through hole in a clamped mode. When the connecting shaft is used as an input end to rotate, the connecting shaft, the retainer, the rolling column and the inner ring synchronously rotate, so that the locking mechanism realizes a transmission function. And when the inner ring is used as an input end to rotate, the rolling columns are finally clamped between the inner ring and the outer ring, so that the locking mechanism realizes a locking function.

Description

[Technical field]

[0001] The utility model relates to the field of gear boxes, in particular to a locking mechanism and a gear box. [Background technology]

[0002] Gearboxes are generally used for mechanical transmission. The input shaft and output shaft of ordinary gearboxes can both be rotated as input ends. However, in some specific usage scenarios, we need the gearbox to have a locking function, so that the gearbox can only be normally transmitted when the input shaft is used as the input end. When the output shaft is rotated, the output shaft is stuck and cannot rotate. However, some existing gearboxes with locking functions will get stuck or jammed at startup due to the locking mechanism. [Contents of the utility model]

[0003] In order to solve the problem that the existing gearbox has no locking function or has a locking function but is easy to get stuck, the utility model provides a locking mechanism, which includes an outer ring and an inner ring, the outer ring is sleeved on the inner ring, a retainer is arranged between the outer ring and the inner ring, a plurality of positioning columns are arranged on the retainer, roller grooves are formed between adjacent positioning columns and the outer ring and the inner ring, rolling columns are arranged in the roller grooves, and the rolling columns contact the outer ring and the inner ring at the same time. A convex block is arranged on the outer surface of the inner ring, the convex block is located between adjacent rolling columns, a first through hole is arranged in the middle of the retainer, and the locking mechanism also includes a connecting shaft, which is clamped in the first through hole.

[0004] Preferably, the outer surface of the inner ring except the area of ​​the protrusion is set as an arc surface, and the diameter of the rolling cylinder is less than or equal to the distance from the arc surface to the inner surface of the outer ring.

[0005] Preferably, two rolling cylinders are arranged in each roller groove, the locking mechanism further comprises an elastic member, the elastic member is at least partially arranged between the two rolling cylinders in the roller groove, the protrusion is arranged in the elastic member, and the elastic member and the positioning cylinder clamp the rolling cylinder.

[0006] Preferably, a spring sheet group is arranged on the elastic member, and the spring sheet group is arranged between two rolling columns in the roller groove. The spring sheet group includes a first spring sheet and a second spring sheet, and the first spring sheet and the second spring sheet respectively abut against adjacent rolling columns. There is a gap between the first spring sheet and the second spring sheet, and the protrusion is located in the gap.

[0007] Preferably, a groove is provided on the retaining frame, and the spring sheet assembly is clamped in the groove.

[0008] Preferably, the elastic member is arranged in a ring shape, a position avoiding hole is arranged in the middle of the elastic member, and the retaining frame is at least partially arranged in the position avoiding hole.

[0009] Preferably, a second through hole coaxial with the first through hole is provided in the middle of the inner ring, and one end of the connecting shaft engaged with the first through hole extends into the second through hole. The cross section of the connecting shaft is smaller than the second through hole, and the connecting shaft is engaged with the second through hole after rotating relative to the inner ring.

[0010] Preferably, the locking mechanism further comprises an output shaft, and the output shaft is clamped in the second through hole at one end away from the connecting shaft.

[0011] Preferably, an arc portion is provided on the inner wall of the second through hole, and one end of the connecting shaft extending into the second through hole is in contact with the arc portion. When the connecting shaft rotates relative to the inner ring, the connecting shaft moves along the arc portion.

[0012] The utility model also provides a gear box, which comprises a gear assembly and a locking mechanism, wherein the gear assembly is connected to a connecting shaft of the locking mechanism.

[0013] Compared with the prior art, the locking assembly and gear box provided by the utility model have the following advantages:

[0014] 1. The locking mechanism provided by the utility model includes an outer ring and an inner ring, the outer ring is sleeved on the inner ring, a retainer is arranged between the outer ring and the inner ring, a plurality of positioning posts are arranged on the retainer, roller grooves are formed between adjacent positioning posts and the outer ring and the inner ring, rolling posts are arranged in the roller grooves, and the rolling posts contact the outer ring and the inner ring at the same time. A convex block is arranged on the outer surface of the inner ring, the convex block is located between adjacent rolling posts, a first through hole is arranged in the middle of the retainer, and the locking mechanism also includes a connecting shaft, which is clamped in the first through hole.

[0015] When the connecting shaft rotates as the input end, the connecting shaft is clamped in the first through hole, so that the connecting shaft drives the cage to rotate. The cage rotation drives the rolling column set in the cage and the cage to rotate coaxially. During this process, the inner ring and the outer ring remain stationary, and the rolling column produces relative displacement with the inner ring along the rotation direction. After the rolling column moves, it contacts the convex block on the inner ring. The rolling column drives the inner ring to rotate through the convex block. Finally, the connecting shaft, cage, rolling column and inner ring rotate synchronously, so that the locking mechanism realizes the transmission function.

[0016] When the inner ring rotates as the input end, after the inner ring rotates a certain angle alone, the protrusion on the inner ring contacts the rolling column. As the protrusion drives the rolling column to rotate, the protrusion will give the rolling column a centrifugal force toward the outer ring, which increases the friction between the rolling column and the outer ring. Finally, the rolling column is stuck between the inner ring and the outer ring, so that the locking mechanism realizes the locking function.

[0017] 2. The outer surface of the inner ring provided by the utility model is set as an arc surface except for the area of ​​the protrusion, and the diameter of the rolling column is less than or equal to the distance from the arc surface to the inner surface of the outer ring. Two rolling columns are set in each roller groove, and the locking mechanism also includes an elastic member, which is at least partially set between the two rolling columns in the roller groove, and the protrusion is placed in the elastic member, and the elastic member and the positioning column clamp the rolling column.

[0018] A spring sheet group is arranged on the elastic member, and the spring sheet group is arranged between two rolling columns in the roller groove. The spring sheet group includes a first spring sheet and a second spring sheet, and the first spring sheet and the second spring sheet respectively abut against adjacent rolling columns. There is a gap between the first spring sheet and the second spring sheet, and the protrusion is located in the gap.

[0019] By setting the elastic member, when the rolling column and the inner ring are relatively displaced and contact the protrusion, as long as the power input at the input end is stopped, the elastic member will elastically reset to push the rolling column back to the initial position, so that the rolling column and the protrusion are out of contact. This makes the locking mechanism smoother each time it starts from a stationary state, avoiding jamming caused by contact between the rolling column and the protrusion during startup.

[0020] 3. The retaining frame provided by the utility model is provided with a groove, and the spring sheet group is clamped in the groove. The elastic member is provided in a ring shape, and a position avoidance hole is provided in the middle of the elastic member, and the retaining frame is at least partially provided in the position avoidance hole. By providing the groove and the position avoidance hole, the spring sheet group of the elastic member can extend between the rolling columns, and the elastic member and the retaining frame can be partially overlapped, thereby reducing the space required for the locking mechanism.

[0021] 4. The middle part of the inner ring provided by the utility model is provided with a second through hole coaxial with the first through hole, and one end of the connecting shaft engaged with the first through hole extends into the second through hole. The cross section of the connecting shaft is smaller than the second through hole, and the connecting shaft is engaged with the second through hole after the connecting shaft rotates relative to the inner ring. The locking mechanism also includes an output shaft, and the output shaft is engaged in the second through hole at one end away from the connecting shaft. An arc portion is provided on the inner wall of the second through hole, and one end of the connecting shaft extending into the second through hole fits the arc portion, and when the connecting shaft rotates relative to the inner ring, the connecting shaft moves along the arc portion.

[0022] By extending the connecting shaft into the second through hole and the connecting shaft and the second through hole being in contact with each other through the arc portion, the relative rotation of the connecting shaft and the inner ring can be maintained without affecting the contact of the protrusion with the rolling column. At the same time, the connecting shaft supports the inner ring, making the structure of the locking mechanism more stable and avoiding the displacement of the internal components of the locking mechanism and causing failure.

[0023] 5. The utility model also provides a gear box, which includes a gear assembly and a locking mechanism, wherein the gear assembly and the locking mechanism are connected by a connecting shaft. The gear box has the same beneficial effects as the locking mechanism.

Brief Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 It is a cross-sectional view of a gear box provided in an embodiment of the utility model.

[0026] Figure 2 It is an exploded view of the locking mechanism provided in the embodiment of the utility model.

[0027] Figure 3 It is a top view of the locking mechanism provided by an embodiment of the utility model in a static state.

[0028] Figure 4 It is a top view of the displacement state of the locking mechanism provided by an embodiment of the utility model.

[0029] Figure 5 This is a diagram of the connection state of the retaining frame and the elastic member provided in an embodiment of the utility model.

[0030] Description of the accompanying drawings:

[0031] 11. Power assembly; 21. Gear assembly; 31. Locking mechanism;

[0032] 111, motor; 112, drive shaft; 211, first-stage planetary gear assembly; 212, second-stage planetary gear assembly; 213, third-stage planetary gear assembly; 214, inner gear ring; 311, connecting shaft; 312, output shaft; 313, elastic member; 314, cage; 315, outer ring; 316, inner ring; 317, rolling column;

[0033] 3131, avoidance hole; 3132, spring piece group; 3133, first spring piece; 3134, second spring piece; 3135, gap; 3141, positioning column; 3142, first through hole; 3143, roller groove; 3144, groove; 3161, protrusion; 3162, second through hole; 3163, arc portion. [Specific implementation method]

[0034] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and implementation examples. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0035] It should be noted that the terms "first" and "second" etc. in the specification and claims of the present utility model are used to distinguish different objects rather than to describe a specific order.

[0036] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0037] In the present invention, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0038] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0039] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0040] To solve the problem that the existing gearbox has no locking function or has a locking function but is prone to jamming, please refer to Figure 1 The embodiment of the utility model provides a gear box, which includes a gear assembly 21, a power assembly 11 and a locking mechanism 31. The power assembly 11, the gear assembly 21 and the locking mechanism 31 are connected in sequence, and the rotation transmitted from the power assembly 11 is transmitted by the gear assembly 21 and then output from the locking mechanism 31. When the locking mechanism 31 is used as an input to start rotating, the locking mechanism 31 is locked and cannot rotate.

[0041] Please refer to Figure 2 and Figure 3 The locking mechanism 31 includes an outer ring 315 and an inner ring 316. The outer ring 315 is sleeved on the inner ring 316. A retainer 314 is arranged between the outer ring 315 and the inner ring 316. The retainer 314 includes a bottom surface. A plurality of positioning posts 3141 perpendicular to the bottom surface are arranged at annular intervals on the bottom surface of the retainer 314. An accommodation space is defined between the inner ring 316 and the outer ring 315. The retainer 314 is arranged in the accommodation space to close a side port of the accommodation space. The positioning posts 3141 are placed along the axial direction of the inner ring 316 and the outer ring 315. Roller grooves 3143 are formed in the accommodation space between adjacent positioning posts 3141 and the outer ring 315 and the inner ring 316. Roller posts 317 are arranged in the roller grooves 3143. The rolling posts 317 contact the outer ring 315 and the inner ring 316 at the same time. A convex block 3161 is arranged on the outer side surface of the inner ring 316. The convex block 3161 is located between adjacent rolling posts 317. A first through hole 3142 is provided in the middle of the retaining frame 314. The locking mechanism 31 also includes a connecting shaft 311, which is clamped in the first through hole 3142. At the same time, one end of the connecting shaft 311 away from the first through hole 3142 is connected to the gear assembly 21. When the gear assembly 21 rotates, it drives the connecting shaft 311 to rotate synchronously.

[0042] Specifically, see Figure 1 The gear assembly 21 includes a primary planetary gear assembly 211, a secondary planetary gear assembly 212, a tertiary planetary gear assembly 213 and a hollow inner gear ring 214. The primary planetary gear assembly 211, the secondary planetary gear assembly 212 and the tertiary planetary gear assembly 213 are sequentially arranged in the inner gear ring 214 along the axial direction of the inner gear ring 214, and adjacent planetary gear assemblies are meshed with each other. At the same time, internal teeth are arranged on the inner wall of the inner gear ring 214, and the secondary planetary gear assembly 212 and the tertiary planetary gear assembly 213 mesh with the inner gear ring 214.

[0043] The power assembly 11 includes a motor 111, and a drive shaft 112 of the motor 111 meshes with a primary planetary gear assembly 211. When the drive shaft 112 rotates, the primary planetary gear assembly 211 is driven to rotate, and the primary planetary gear assembly 211 is then transmitted to the meshed secondary planetary gear assembly 212, and the secondary planetary gear assembly 212 drives the inner gear ring 214 to rotate, and the inner gear ring 214 drives the tertiary planetary gear assembly 213 to rotate. At the same time, one end of the connecting shaft 311 away from the first through hole 3142 is connected to the tertiary planetary gear assembly 213, and when the tertiary planetary gear assembly 213 rotates, it drives the connecting shaft 311 to rotate synchronously.

[0044] See also Figure 4When the connecting shaft 311 rotates as the input end, the connecting shaft 311 is clamped in the first through hole 3142, so that the connecting shaft 311 drives the holder 314 to rotate. The rotation of the holder 314 drives the rolling column 317 disposed in the holder 314 to rotate coaxially with the holder 314. During this process, the inner ring 316 and the outer ring 315 remain stationary, and the rolling column 317 produces relative displacement with the inner ring 316 along the rotation direction. After the displacement, the rolling column 317 contacts the convex block 3161 on the inner ring 316, and the rolling column 317 drives the inner ring 316 to rotate through the convex block 3161. Finally, the connecting shaft 311, the holder 314, the rolling column 317 and the inner ring 316 rotate synchronously, so that the locking mechanism 31 realizes the transmission function, and the power transmitted by the driving shaft 112 of the motor 111 in the power assembly 11 can be output from the locking mechanism 31.

[0045] The locking mechanism 31 of the gearbox is connected to an external component for use. When the power assembly 11 stops rotating, the external component will drive the inner ring 316 of the locking mechanism 31 connected thereto to rotate under the action of gravity. When the inner ring 316 rotates as the input end, after the inner ring 316 rotates a certain angle alone, the protrusion 3161 on the inner ring 316 contacts the rolling column 317. Since the protrusion 3161 drives the rolling column 317 to rotate, the protrusion 3161 will give the rolling column 317 a centrifugal force toward the outer ring 315, which increases the friction between the rolling column 317 and the outer ring 315. Finally, the rolling column 317 is stuck between the inner ring 316 and the outer ring 315, so that the locking mechanism 31 realizes the locking function, which can avoid reverse transmission caused by the force on this side of the locking mechanism 31.

[0046] Specifically, see Figure 3 The outer surface of the inner ring 316 except the area of ​​the protrusion 3161 is set as an arc surface, and the diameter of the rolling cylinder 317 is less than or equal to the distance from the arc surface to the inner surface of the outer ring 315, so that the rolling cylinder 317 and the inner ring 316 can move smoothly relative to each other, and then the rolling cylinder 317 contacts the protrusion 3161 on the inner ring 316.

[0047] Two rolling posts 317 are arranged in each roller groove 3143 . The locking mechanism 31 further includes an elastic member 313 . The elastic member 313 is at least partially arranged between the two rolling posts 317 in the roller groove 3143 . The protrusion 3161 is placed in the elastic member 313 . The elastic member 313 and the positioning post 3141 clamp the rolling post 317 .

[0048] Please refer to Figure 3 and Figure 4By setting the elastic member 313, when the rolling column 317 and the inner ring 316 are relatively displaced and contact the protrusion 3161, as long as the power input at the input end is stopped, the elastic member 313 elastically resets to push the rolling column 317 back to the initial position, so that the rolling column 317 and the protrusion 3161 are out of contact. This makes the locking mechanism 31 smoother each time it starts from a stationary state, avoiding jamming caused by the contact between the rolling column 317 and the protrusion 3161 during startup.

[0049] For further information, see Figure 5 A spring sheet group 3132 is arranged on the elastic member 313, and the spring sheet group 3132 is arranged between the two rolling posts 317 in the roller groove 3143. The spring sheet group 3132 includes a first spring sheet 3133 and a second spring sheet 3134. The first spring sheet 3133 and the second spring sheet 3134 respectively abut against the adjacent rolling posts 317. There is a gap 3135 between the first spring sheet 3133 and the second spring sheet 3134, and the protrusion 3161 is located in the gap 3135. By arranging the first spring sheet 3133 and the second spring sheet 3134, the gap 3135 exists in the spring sheet group 3132. The protrusion 3161 is placed in the gap 3135 to avoid interference of the protrusion 3161 with the elastic reset of the spring sheet group 3132.

[0050] Specifically, see Figure 5 The retaining frame 314 is provided with a groove 3144, and the spring group 3132 is clamped in the groove 3144. The elastic member 313 is provided in a ring shape, and a position avoidance hole 3131 is provided in the middle of the elastic member 313, and the retaining frame 314 is at least partially provided in the position avoidance hole 3131.

[0051] The groove 3144 and the avoidance hole 3131 are provided so that the spring sheet group 3132 of the elastic member 313 can extend between the rolling posts 317 , and the elastic member 313 and the retaining frame 314 can be partially overlapped, thereby reducing the space occupied by the locking mechanism 31 .

[0052] Specifically, see Figure 2 The middle part of the inner ring 316 is provided with a second through hole 3162 coaxial with the first through hole 3142, and one end of the connecting shaft 311 engaged with the first through hole 3142 extends into the second through hole 3162. The cross section of the connecting shaft 311 is smaller than the second through hole 3162, and the connecting shaft 311 is engaged with the second through hole 3162 after the connecting shaft 311 rotates relative to the inner ring 316. The locking mechanism 31 also includes an output shaft 312, and the output shaft 312 is engaged in the second through hole 3162 at one end away from the connecting shaft 311.

[0053] Specifically, see Figure 4An arc portion 3163 is provided on the inner wall of the second through hole 3162 , and one end of the connecting shaft 311 extending into the second through hole 3162 is in contact with the arc portion 3163 . When the connecting shaft 311 rotates relative to the inner ring 316 , the connecting shaft 311 moves along the arc portion 3163 .

[0054] By extending the connecting shaft 311 into the second through hole 3162, and the connecting shaft 311 and the second through hole 3162 are in close contact with each other through the arc portion 3163, the relative rotation between the connecting shaft 311 and the inner ring 316 can be maintained without affecting the contact between the protrusion 3161 and the rolling column 317. At the same time, the connecting shaft 311 supports the inner ring 316, making the structure of the locking mechanism 31 more stable, thereby avoiding the internal components of the locking mechanism 31 from being offset and causing failures.

[0055] In this embodiment, the locking mechanism 31 can normally transmit the rotation transmitted from the power assembly 11, and can jam the output shaft 312 when rotating from the output shaft 312 of the locking mechanism 31. At the same time, an elastic member 313 is provided in the locking mechanism 31, so that when the locking mechanism 31 rotates or jams, the elastic member 313 can return the components in the locking mechanism 31 to the initial position, which can avoid the locking mechanism 31 from jamming when starting, and make the transmission of the locking mechanism 31 smoother.

[0056] Compared with the prior art, the locking assembly and gear box provided by the utility model have the following advantages:

[0057] 1. The locking mechanism provided by the utility model includes an outer ring and an inner ring, the outer ring is sleeved on the inner ring, a retainer is arranged between the outer ring and the inner ring, a plurality of positioning posts are arranged on the retainer, roller grooves are formed between adjacent positioning posts and the outer ring and the inner ring, rolling posts are arranged in the roller grooves, and the rolling posts contact the outer ring and the inner ring at the same time. A convex block is arranged on the outer surface of the inner ring, the convex block is located between adjacent rolling posts, a first through hole is arranged in the middle of the retainer, and the locking mechanism also includes a connecting shaft, which is clamped in the first through hole.

[0058] When the connecting shaft rotates as the input end, the connecting shaft is clamped in the first through hole, so that the connecting shaft drives the cage to rotate. The cage rotation drives the rolling column set in the cage and the cage to rotate coaxially. During this process, the inner ring and the outer ring remain stationary, and the rolling column produces relative displacement with the inner ring along the rotation direction. After the rolling column moves, it contacts the convex block on the inner ring. The rolling column drives the inner ring to rotate through the convex block. Finally, the connecting shaft, cage, rolling column and inner ring rotate synchronously, so that the locking mechanism realizes the transmission function.

[0059] When the inner ring rotates as the input end, after the inner ring rotates a certain angle alone, the protrusion on the inner ring contacts the rolling column. As the protrusion drives the rolling column to rotate, the protrusion will give the rolling column a centrifugal force toward the outer ring, which increases the friction between the rolling column and the outer ring. Finally, the rolling column is stuck between the inner ring and the outer ring, so that the locking mechanism realizes the locking function.

[0060] 2. The outer surface of the inner ring provided by the utility model is set as an arc surface except for the area of ​​the protrusion, and the diameter of the rolling column is less than or equal to the distance from the arc surface to the inner surface of the outer ring. Two rolling columns are set in each roller groove, and the locking mechanism also includes an elastic member, which is at least partially set between the two rolling columns in the roller groove, and the protrusion is placed in the elastic member, and the elastic member and the positioning column clamp the rolling column.

[0061] A spring sheet group is arranged on the elastic member, and the spring sheet group is arranged between two rolling columns in the roller groove. The spring sheet group includes a first spring sheet and a second spring sheet, and the first spring sheet and the second spring sheet respectively abut against adjacent rolling columns. There is a gap between the first spring sheet and the second spring sheet, and the protrusion is located in the gap.

[0062] By setting the elastic member, when the rolling column and the inner ring are relatively displaced and contact the protrusion, as long as the power input at the input end is stopped, the elastic member will elastically reset to push the rolling column back to the initial position, so that the rolling column and the protrusion are out of contact. This makes the locking mechanism smoother each time it starts from a stationary state, avoiding jamming caused by contact between the rolling column and the protrusion during startup.

[0063] 3. The retaining frame provided by the utility model is provided with a groove, and the spring sheet group is clamped in the groove. The elastic member is provided in a ring shape, and a position avoidance hole is provided in the middle of the elastic member, and the retaining frame is at least partially provided in the position avoidance hole. By providing the groove and the position avoidance hole, the spring sheet group of the elastic member can extend between the rolling columns, and the elastic member and the retaining frame can be partially overlapped, thereby reducing the space required for the locking mechanism.

[0064] 4. The middle part of the inner ring provided by the utility model is provided with a second through hole coaxial with the first through hole, and one end of the connecting shaft engaged with the first through hole extends into the second through hole. The cross section of the connecting shaft is smaller than the second through hole, and the connecting shaft is engaged with the second through hole after the connecting shaft rotates relative to the inner ring. The locking mechanism also includes an output shaft, and the output shaft is engaged in the second through hole at one end away from the connecting shaft. An arc portion is provided on the inner wall of the second through hole, and one end of the connecting shaft extending into the second through hole fits the arc portion, and when the connecting shaft rotates relative to the inner ring, the connecting shaft moves along the arc portion.

[0065] By extending the connecting shaft into the second through hole and the connecting shaft and the second through hole being in contact with each other through the arc portion, the relative rotation of the connecting shaft and the inner ring can be maintained without affecting the contact of the protrusion with the rolling column. At the same time, the connecting shaft supports the inner ring, making the structure of the locking mechanism more stable and avoiding the displacement of the internal components of the locking mechanism and causing failure.

[0066] 5. The utility model also provides a gear box, which includes a gear assembly and a locking mechanism, wherein the gear assembly and the locking mechanism are connected by a connecting shaft. The gear box has the same beneficial effects as the locking mechanism.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A locking mechanism, characterized in that: It comprises an outer ring and an inner ring, wherein the outer ring is sleeved on the inner ring, a retaining frame is arranged between the outer ring and the inner ring, a plurality of positioning posts are arranged on the retaining frame, roller grooves are formed between the adjacent positioning posts and the outer ring and the inner ring, rolling posts are arranged in the roller grooves, and the rolling posts contact the outer ring and the inner ring at the same time; A bulge is arranged on the outer surface of the inner ring, and the bulge is located between adjacent rolling columns. A first through hole is arranged in the middle of the retaining frame, and the locking mechanism further comprises a connecting shaft, and the connecting shaft is clamped in the first through hole.

2. A locking mechanism according to claim 1, characterized in that: The outer surface of the inner ring except the area of ​​the protrusion is set as an arc surface, and the diameter of the rolling cylinder is less than or equal to the distance from the arc surface to the inner surface of the outer ring.

3. A locking mechanism according to claim 2, characterized in that: Two rolling columns are arranged in each roller groove, and the locking mechanism also includes an elastic member, which is at least partially arranged between the two rolling columns in the roller groove, and the protrusion is placed in the elastic member, and the elastic member and the positioning column clamp the rolling column.

4. A locking mechanism according to claim 3, characterized in that: A spring sheet group is arranged on the elastic member, and the spring sheet group is arranged between the two rolling columns in the roller groove. The spring sheet group includes a first spring sheet and a second spring sheet, and the first spring sheet and the second spring sheet respectively abut against the adjacent rolling columns. There is a gap between the first spring sheet and the second spring sheet, and the protrusion is located in the gap.

5. A locking mechanism according to claim 4, characterized in that: The retaining frame is provided with a groove, and the spring sheet group is clamped in the groove.

6. A locking mechanism according to claim 5, characterized in that: The elastic member is arranged in a ring shape, a position avoiding hole is arranged in the middle of the elastic member, and the retaining frame is at least partially arranged in the position avoiding hole.

7. A locking mechanism according to claim 6, characterized in that: A second through hole coaxial with the first through hole is provided in the middle of the inner ring, and one end of the connecting shaft engaged with the first through hole extends into the second through hole; The cross section of the connecting shaft is smaller than the second through hole, and the connecting shaft is engaged with the second through hole after the connecting shaft rotates relative to the inner ring.

8. A locking mechanism according to claim 7, characterized in that: The locking mechanism further comprises an output shaft, and the output shaft is clamped in the second through hole at one end away from the connecting shaft.

9. A locking mechanism according to claim 8, characterized in that: An arc portion is provided on the inner wall of the second through hole, and one end of the connecting shaft extending into the second through hole is in contact with the arc portion. When the connecting shaft rotates relative to the inner ring, the connecting shaft moves along the arc portion.

10. A gear box, characterized in that: It comprises a gear assembly and a locking mechanism as described in any one of claims 1 to 9, wherein the gear assembly is connected to a connecting shaft of the locking mechanism.

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