Reversing mechanism and transmission device

Abstract

The utility model provides a reversing mechanism and a transmission device, and relates to the technical field of transmission devices, the reversing mechanism comprises a transmission seat, a fixed chain, a first chain wheel, a free chain and a second chain wheel; the driving end is used for driving the transmission base to move in the first direction. A fixed section is arranged on the fixed chain, the fixed section is static when the transmission seat moves, and other sections, except the fixed section, of the fixed chain can move in the first direction when the transmission seat moves; the first chain wheel is rotationally connected with the transmission seat and is meshed with the fixed chain; the second chain wheel is rotationally connected with the transmission seat; a rotating shaft of the first chain wheel is parallel to a rotating shaft of the second chain wheel; the free chain surrounds and is meshed with the second chain wheel; the first chain wheel and the second chain wheel are in transmission through a gear set, so that the first chain wheel drives the second chain wheel to rotate and have the same movement direction at the same time; the second chain wheel is used for being meshed with the first rack on the movable end so that the movable end and the transmission base can have the same movement direction.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission devices, in particular to a reversing mechanism and a transmission device. Background Art

[0002] In automated equipment, conventional transmission devices, such as screw mechanisms, are generally used to carry out the movement of mounted components and product handling, and modules with different strokes are used for combined operation.

[0003] Existing linear motion technologies are all based on sliders and screws to achieve linear motion, with a single motion direction and unable to achieve long-stroke and heavy-load movement. Utility Model Content

[0004] The purpose of the utility model is to provide a reversing mechanism and a transmission device to alleviate the technical problems of low load and single movement direction of the existing transmission device.

[0005] In a first aspect, the present invention provides a reversing mechanism, which is arranged between a driving end and a moving end so that the driving end can realize bidirectional movement of the moving end through the reversing mechanism, and includes: a transmission seat, a fixed chain, a first sprocket, a free chain, and a second sprocket;

[0006] The transmission seat is connected to the driving end, and the driving end is used to drive the transmission seat to move along the first direction;

[0007] The fixed chain is provided with a fixed section, the fixed section is stationary when the transmission base moves, and the other sections of the fixed chain except the fixed section can move along the first direction when the transmission base moves;

[0008] The first sprocket is rotatably connected to the transmission base and meshed with the fixed chain; the second sprocket is rotatably connected to the transmission base, and the rotation axis of the first sprocket is parallel to the rotation axis of the second sprocket; the free chain surrounds and meshes with the second sprocket; the first sprocket and the second sprocket are driven by a gear set, so that the first sprocket drives the second sprocket to rotate, and the two sprockets have the same movement direction at the same time;

[0009] The second sprocket is used to engage with the first rack on the moving end so that the moving end and the transmission seat have the same movement direction.

[0010] Furthermore, the reversing mechanism further includes a connecting seat, and the transmission seat is slidably connected to the connecting seat along the first direction.

[0011] Furthermore, the connecting seat is provided with two first limiting sliding grooves located on opposite sides of the transmission seat, and the first limiting sliding grooves extend along the first direction;

[0012] The first limiting sliding groove is fixedly connected to the connecting seat;

[0013] First slide rails that are slidably connected to the first limiting sliding groove are respectively arranged on opposite sides of the transmission seat;

[0014] The first limiting sliding groove is used to prevent the transmission seat from moving in a second direction, the second direction is perpendicular to the first direction and the third direction respectively, and the third direction is the stacking direction of the connecting seat and the transmission seat.

[0015] Further, the transmission seat includes two side walls that extend in the first direction and are spaced apart in the second direction, and a connecting bar is connected between the two side walls, and the connecting bar is connected to the transmission belt at the driving end;

[0016] The first sprocket includes two first wheel bodies, the second sprocket includes two second wheel bodies, and the two first wheel bodies are respectively located on opposite end sides of the connecting bar; the two second wheel bodies are respectively located on opposite end sides of the connecting bar.

[0017] Further, the transmission ratio of the first sprocket and the second sprocket is 1:2.

[0018] Further, the first sprocket is rotatably connected to the transmission seat through a first rotating shaft, and the second sprocket is rotatably connected to the transmission seat through a second rotating shaft; a first transmission gear (210) is arranged on the first rotating shaft, and a second transmission gear is arranged on the second rotating shaft;

[0019] The gear set includes a third transmission gear, the third transmission gear rotates with the transmission seat, and the third transmission gear is meshed between the first transmission gear and the second transmission gear to transmit the torque of the first transmission gear to the second transmission gear.

[0020] Further, the transmission ratios of the first transmission gear, the second transmission gear, and the third transmission gear are 1:1:1.

[0021] Further, the number of the free chains is at least two, and all the free chains are connected into a whole and have the same motion state;

[0022] At least one free chain is meshed with the second sprocket; at least one free chain is used to connect to the first rack.

[0023] Further, two second sprockets are arranged at intervals on the second rotating shaft;

[0024] Three of the free chains are connected into a whole, and the free chain in the middle is used to connect to the first rack; the two free chains on both sides are respectively connected to the two second sprockets.

[0025] In a second aspect, the present invention provides a transmission device comprising the above-mentioned reversing mechanism.

[0026] The present invention has at least the following advantages or beneficial effects:

[0027] The reversing mechanism provided by the utility model is arranged between the driving end and the moving end, so that the driving end can realize the bidirectional movement of the moving end through the reversing mechanism, and includes: a transmission seat, a fixed chain, a first sprocket, a free chain, and a second sprocket; the transmission seat is connected to the driving end, and the driving end is used to drive the transmission seat to move in a first direction; a fixed section is provided on the fixed chain, and the fixed section is stationary when the transmission seat moves, and the other sections of the fixed chain except the fixed section can move in the first direction when the transmission seat moves; the first sprocket is rotatably connected to the transmission seat, and the first sprocket is meshed with the fixed chain; the second sprocket is rotatably connected to the transmission seat, and the rotating shaft of the first sprocket is parallel to the rotating shaft of the second sprocket; the free chain surrounds and meshes with the second sprocket; the first sprocket and the second sprocket are driven by a gear set, so that the first sprocket drives the second sprocket to rotate, and the two have the same movement direction at the same time; the second sprocket is used to mesh with the first rack on the moving end, so that the moving end and the transmission seat have the same movement direction.

[0028] When in use, the fixed section is stationary, and under the drive of the driving end, the transmission seat can move along the first direction. Taking the left and right directions as an example, the transmission seat can move to the left or to the right. Taking the left movement as an example, when the transmission seat slides to the left as a whole, the fixed chain is pushed to move to the left, and the first sprocket rotates counterclockwise under the drive of the fixed chain. The corresponding second sprocket with the same rotation direction as the first sprocket also rotates counterclockwise under the drive of the first sprocket. The second sprocket drives the free chain to rotate counterclockwise, and the first rack on the mobile end above the transmission seat moves to the left under the drive of the free chain, thereby realizing the situation that the transmission seat and the mobile end move to the same side, increasing the stroke of the mobile end. Similarly, when the driving end drives the transmission seat to move to the right, the mobile end can move to the right together with the transmission seat. The reversing mechanism in this embodiment has a larger load, especially in the cantilever state, and can achieve single-power reversing.

[0029] The transmission device provided by the present invention includes the above-mentioned reversing mechanism. Since the transmission device provided by the present invention adopts the above-mentioned reversing mechanism, the transmission device provided by the present invention also has the advantages of the reversing mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 Top view of the commutation mechanism provided by the embodiment of the present invention;

[0032] Figure 2 For Figure 1 Partial enlarged view at position M in

[0033] Figure 3 For Figure 1 Cross-sectional view in the A - A direction in

[0034] Figure 4 For Figure 1 Cross-sectional view in the B - B direction in

[0035] Figure 5 For Figure 1 Cross-sectional view in the C - C direction in

[0036] Figure 6 Front view of the transmission device provided by the embodiment of the present invention;

[0037] Figure 7 For Figure 6 Cross-sectional view in the L - L direction in

[0038] Figure 8 Bottom view of the transmission device provided by the embodiment of the present invention;

[0039] Figure 9 For Figure 8 Cross-sectional view in the D - D direction in

[0040] Figure 10 For Figure 8 Cross-sectional view in the E - E direction in

[0041] Figure 11 For Figure 8 Cross-sectional view in the F - F direction in

[0042] Figure 12 For Figure 11 Partial enlarged view at position K in

[0043] Figure 13 Simplified schematic diagram of the transmission device provided by the embodiment of the present invention.

[0044] Icons: 100 - connecting base; 110 - motor; 120 - pulley; 130 - belt; 140 - fixing chain; 141 - fixing section; 150 - limiting wheel; 160 - connecting bar;

[0045] 200 - driving base; 210 - first driving gear; 220 - first sprocket; 230 - third driving gear; 240 - second driving gear; 250 - second sprocket; 260 - free chain;

[0046] 300 - mobile end; 310 - first rack;

[0047] 410 - first limiting chute; 420 - first slide rail. Detailed implementation manners

[0048] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0049] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0050] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0051] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this utility model is usually placed when in use. It is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0052] In addition, terms such as "horizontal" and "vertical" do not require the components to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0053] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0054] As Figure 1 - Figure 13 As shown, the commutation mechanism provided by the present utility model is arranged between the driving end and the mobile end 300, so that the driving end realizes the bidirectional movement of the mobile end 300 through the commutation mechanism.

[0055] The commutation mechanism includes: a connection seat 100, a transmission seat 200, a fixed chain 140, a first sprocket 220, a free chain 260, and a second sprocket 250.

[0056] Before the transmission device works, the connection seat 100 needs to be fixed to form a stable driving environment.

[0057] As Figure 1 As shown, the transmission seat 200 is slidably connected to the connection seat 100 in a first direction, and the mobile end 300 is slidably connected to the transmission seat 200 in the first direction. In this embodiment, the first direction is the left-right direction. The connection seat 100, the transmission seat 200, and the mobile end 300 are arranged in sequence in a third direction. In this embodiment, the third direction is the up-down direction. The connection seat 100 is located at the bottom, the transmission seat 200 is located in the middle, and the mobile end 300 is located at the top.

[0058] The driving end is used to drive the transmission seat 200 to move relative to the connection seat 100 in the first direction. The main body of the driving end is connected to the connection seat 100, and the driving end drives the transmission seat 200.

[0059] As Figure 4 and Figure 10As shown, a fixed section 141 is provided on the fixed chain 140. The fixed section 141 is connected to the connecting seat 100 so that other sections of the fixed chain 140 except the fixed section 141 can move relative to the connecting seat 100 in the first direction. The fixed chain 140 can be a complete annular structure, and one, two or three sections thereof can be fixedly connected to the connecting seat 100. It should be noted that the total number of sections of the fixed chain 140 is much more than three. The fixed chain 140 can also be a strip structure, that is, the two ends are not connected into a ring, and the opposite ends of the fixed chain 140 are both fixed on the connecting seat 100. The distance between the opposite ends of the fixed chain 140 is much smaller than the total length of the fixed chain 140 so that the fixed chain 140 forms a ring after being connected to the transmission seat 200.

[0060] The first sprocket 220 is rotatably connected to the transmission seat 200, and the first sprocket 220 meshes with the fixed chain 140. After the fixed chain 140 moves, it can drive the first sprocket 220 to rotate.

[0061] As Figure 5 shown, the second sprocket 250 is rotatably connected to the transmission seat 200, and the rotation axis of the first sprocket 220 is parallel to the rotation axis of the second sprocket 250. The free chain 260 surrounds and meshes with the second sprocket 250. The first sprocket 220 and the second sprocket 250 are driven by a gear set. When the first sprocket 220 rotates, the gear set transmits torque to the second sprocket 250 to drive the second sprocket 250 to rotate, and the first sprocket 220 and the second sprocket 250 have the same direction of motion at the same time, rotating clockwise or counterclockwise simultaneously.

[0062] As Figure 13 shown, a first rack 310 extending in the first direction is provided on the mobile end 300. The first rack 310 is located above the free chain 260, and the tooth surface faces and meshes with the free chain 260.

[0063] During use, the fixed section 141 remains stationary. Driven by the driving end, the transmission seat 200 can move in the first direction. Taking the left - right direction as an example, the transmission seat 200 can move to the left or to the right. Taking the left - moving as an example, when the whole transmission seat 200 slides to the left, the fixed chain 140 is pushed to move to the left. The first sprocket 220 rotates counter - clockwise under the drive of the fixed chain 140. The second sprocket 250 with the same rotation direction as the first sprocket 220 also rotates counter - clockwise under the drive of the first sprocket 220. The second sprocket 250 drives the free chain 260 to rotate counter - clockwise. The first rack 310 on the mobile end 300 above the transmission seat 200 moves to the left under the drive of the free chain 260, thus realizing the situation that the transmission seat 200 and the mobile end 300 move towards the same side, increasing the stroke of the mobile end 300. Similarly, when the driving end drives the transmission seat 200 to move to the right, the mobile end 300 can move to the right together with the transmission seat 200. The reversing mechanism in this embodiment has a greater load, especially in the cantilever state, and can realize single - power reversing.

[0064] The connecting seat 100 can be in a plate shape. The driving end is arranged on the lower surface, while the transmission seat 200 is arranged on the upper surface. The two are transmitted through the through - holes on the connecting seat 100.

[0065] As Figure 7 shown, two first limiting sliding grooves 410 are arranged on the connecting seat 100 on the relative two sides of the transmission seat 200. The first limiting sliding grooves 410 extend along the first direction; the first limiting sliding grooves 410 are fixedly connected with the connecting seat 100; first sliding rails 420 which are slidably connected with the first limiting sliding grooves 410 are respectively arranged on the relative two sides of the transmission seat 200; the first limiting sliding grooves 410 are used to prevent the transmission seat 200 from moving in the second direction. The second direction is perpendicular to the first direction and the third direction respectively. The third direction is the stacking direction of the connecting seat 100, the transmission seat 200 and the mobile end 300.

[0066] The first limiting sliding groove 410 is slidably connected with the first sliding rail 420. Moreover, the first limiting sliding groove 410 will form a restriction on the first sliding rail 420, so that the first sliding rail 420 can only move in the first direction, avoiding front - back or up - down movement, and ensuring the stable operation.

[0067] As Figure 3As shown, the drive seat 200 includes two side walls extending along a first direction and spaced apart along a second direction. A connecting bar 160 is connected between the two side walls. The connecting bar 160 is used for connecting the drive belt at the drive end. The first sprocket includes two first wheel bodies, and the second sprocket includes two second wheel bodies. The two first wheel bodies are respectively located on opposite ends of the connecting bar 160. The two second wheel bodies are respectively located on opposite ends of the connecting bar 160.

[0068] As Figure 9 shown, the drive end includes a motor 110, a pulley 120 and a belt 130. The pulley 120 is coaxially arranged with the output shaft of the motor 110. The belt 130 includes a first end and a second end. The first end and the second end are respectively connected to opposite ends of the connecting bar 160 in the first direction. The pulley 120 is connected to the belt 130 and is located within the loop formed by the belt 130 and the drive seat 200. The two first wheel bodies are respectively located on opposite ends of the connecting bar 160. The two second wheel bodies are respectively located on opposite ends of the connecting bar 160, so as to maximize the lengths of the fixed chain 140 and the free chain 260, thereby increasing the stroke.

[0069] The transmission ratio of the first sprocket 220 and the second sprocket 250 is 1:2. Thus, after the drive seat 200 travels one unit length, the mobile end 300 advances two unit lengths, further increasing the maximum stroke. Of course, the transmission ratio of the first sprocket 220 and the second sprocket 250 can also be other ratios.

[0070] As Figure 3 shown, the first sprocket 220 is rotatably connected to the drive seat 200 through a first rotating shaft, and the second sprocket 250 is rotatably connected to the drive seat 200 through a second rotating shaft. A first transmission gear 210 is arranged on the first rotating shaft, and a second transmission gear 240 is arranged on the second rotating shaft. The gear set includes a third transmission gear 230. The third transmission gear 230 is rotatable with the drive seat 200, and the third transmission gear 230 meshes between the first transmission gear 210 and the second transmission gear 240 for transferring the torque of the first transmission gear 210 to the second transmission gear 240. Among them, the transmission ratios of the first transmission gear 210, the second transmission gear 240 and the third transmission gear 230 are the same.

[0071] As Figure 2 shown, the number of the free chains 260 is at least two, and all the free chains 260 are connected into a whole and have the same motion state. At least one free chain 260 meshes with the second sprocket 250. At least one free chain 260 is used for connecting with the first rack 310.

[0072] Two different free chains 260 are respectively engaged with the first rack 310 and the second sprocket 250 to avoid interference between the teeth on the first rack 310 and the teeth on the second sprocket 250 .

[0073] Specifically, two second sprockets are spaced apart on the second rotating shaft; the three free chains 260 are connected to form a whole, with the central free chain 260 being connected to the first rack 310; and the two free chains 260 on either side being connected to the two second sprockets, respectively. This enhances the strength of the free chains 260 and thus improves the load capacity.

[0074] The transmission device provided by the present invention includes the above-mentioned reversing mechanism. Since the transmission device provided by the present invention adopts the above-mentioned reversing mechanism, the transmission device provided by the present invention also has the advantages of the reversing mechanism.

[0075] like Figure 6 - Figure 13 As shown, the main body of the motor 110 is fixedly connected to the bottom of the connecting base 100. The connecting base 100 is provided with through-holes extending through its upper and lower surfaces. The ends of the belt 130 pass through the through-holes from bottom to top and connect to opposite ends of the transmission base 200 in a first direction. The side of the belt 130 facing the transmission base 200 is wound around and abuts against the circumferential sidewalls of the pulley 120. To prevent the belt 130 from contacting the through-hole walls, the drive end further includes two limiting pulleys 150 located on opposite sides of the pulley 120. Both limiting pulleys 150 are rotatably connected to the connecting base 100. The side of the belt 130 facing away from the transmission base 200 is connected to the limiting pulleys 150, while the side of the belt 130 facing the transmission base 200 is connected to the pulley 120, resulting in a "U" shape in the portion of the belt 130 wound around the pulley 120. When the motor 110 drives the pulley 120 to rotate clockwise, the belt 130 drives the transmission base 200 to move leftward. Conversely, when the motor 110 drives the pulley 120 to rotate counterclockwise, the belt 130 drives the transmission base 200 to move rightward. Using the belt 130 to drive the transmission base 200 can achieve a longer travel while maintaining a certain length.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A commutation mechanism, characterized in that, The reversing mechanism is arranged between the driving end and the moving end (300), so that the driving end can realize the bidirectional movement of the moving end (300) through the reversing mechanism, and comprises: a transmission seat (200), a fixed chain (140), a first sprocket (220), a free chain (260), and a second sprocket (250); The transmission seat (200) is connected to the driving end, and the driving end is used to drive the transmission seat (200) to move along a first direction; The fixed chain (140) is provided with a fixed section (141), the fixed section (141) remains stationary when the transmission seat (200) moves, and the other sections of the fixed chain (140) except the fixed section (141) are capable of moving along a first direction when the transmission seat (200) moves; The first sprocket (220) is rotatably connected to the transmission seat (200), and the first sprocket (220) is engaged with the fixed chain (140); the second sprocket (250) is rotatably connected to the transmission seat (200), and the rotation axis of the first sprocket (220) is parallel to the rotation axis of the second sprocket (250); the free chain (260) surrounds and engages with the second sprocket (250); the first sprocket (220) and the second sprocket (250) are driven by a gear set, so that the first sprocket (220) drives the second sprocket (250) to rotate, and the two have the same movement direction at the same time; The second sprocket (250) is used to engage with the first rack (310) on the moving end (300), so that the moving end (300) and the transmission seat (200) have the same movement direction.

2. The commutation mechanism according to claim 1, characterized in that, The reversing mechanism further comprises a connecting seat (100), and the transmission seat (200) is slidably connected to the connecting seat (100) along a first direction.

3. The reversing mechanism according to claim 2, characterized in that: The connecting seat (100) is provided with two first limiting sliding grooves (410) located on opposite sides of the transmission seat (200), and the first limiting sliding grooves (410) extend along a first direction; The first limiting sliding groove (410) is fixedly connected to the connecting seat (100); First slide rails (420) slidably connected to the first limiting slide groove (410) are respectively provided on opposite sides of the transmission seat (200); The first limiting sliding groove (410) is used to prevent the transmission seat (200) from moving along a second direction, the second direction being perpendicular to the first direction and the third direction respectively, and the third direction being the stacking direction of the connecting seat (100) and the transmission seat (200).

4. The reversing mechanism according to claim 3, characterized in that: The transmission seat (200) comprises two side walls extending in a first direction and spaced apart in a second direction, a connecting bar (160) being connected between the two side walls, and the connecting bar (160) being used for connecting a transmission belt at a driving end; The first sprocket includes two first wheel bodies, and the second sprocket includes two second wheel bodies. The two first wheel bodies are respectively located at opposite ends of the connecting bar (160); and the two second wheel bodies are respectively located at opposite ends of the connecting bar (160).

5. The commutation mechanism according to claim 1, characterized in that The transmission ratio of the first sprocket (220) and the second sprocket (250) is 1:

2.

6. The commutation mechanism according to claim 1, wherein The first sprocket (220) is rotatably connected to the transmission seat (200) via a first rotating shaft, and the second sprocket (250) is rotatably connected to the transmission seat (200) via a second rotating shaft; a first transmission gear (210) is provided on the first rotating shaft, and a second transmission gear (240) is provided on the second rotating shaft; The gear set includes a third transmission gear (230), the third transmission gear (230) rotates with the transmission base (200), and the third transmission gear (230) is engaged between the first transmission gear (210) and the second transmission gear (240), and is used to transfer the torque of the first transmission gear (210) to the second transmission gear (240).

7. The reversing mechanism according to claim 6, characterized in that: The transmission ratio of the first transmission gear (210), the second transmission gear (240) and the third transmission gear (230) is 1:1:

1.

8. The reversing mechanism according to claim 6, characterized in that: The number of the free chains (260) is at least two, and all the free chains (260) are connected into a whole and have the same motion state; There is at least one free chain (260) engaged with the second sprocket (250); and there is at least one free chain (260) for connecting with the first rack (310).

9. The reversing mechanism according to claim 8, characterized in that: Two second sprockets are spaced apart on the second rotating shaft; The three free chains (260) are connected into a whole, and the free chain (260) located in the middle is used to connect with the first rack (310); the two free chains (260) located on both sides are respectively connected with the two second sprockets.

10. A transmission device, characterized in that, The invention comprises the reversing mechanism according to any one of claims 1 to 9.

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