Gear transmission system

Abstract

The present invention relates to the technical field of gear transmission structures, and provides a gear transmission system including: a housing, a rotating shaft disposed on the housing, a first gear coaxially disposed on the rotating shaft, a second gear coaxially disposed on the rotating shaft and rotatable relative to the rotating shaft, a rod body disposed on the housing, a third gear coaxially disposed on the rod body and slidable along the rod body, and a positioning mechanism for positioning the third gear at a first position or a second position on the rod body; when the gear is at the first position, the third gear meshes with the first gear and the second gear respectively; when the gear is at the second position, the third gear is separated from the second gear. When the first gear slides to the first position, the third gear meshes with the first gear and the second gear, and the first gear drives the second gear to rotate through the third gear; when the first gear slides to the second position, the third gear is separated from the second gear.

Description

Technical Field

[0001] The present invention belongs to the technical field of gear transmission structures, and more specifically, relates to a gear transmission system. Background Art

[0002] In modern electromechanical equipment, gear shifting is often achieved through various gear switches. However, the process of changing the transmission between gears during gear shifting is very complex. Summary of the Invention

[0003] The purpose of the present invention is to provide a gear transmission system to solve the technical problem of very complex transmission switching between gears in the prior art.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: providing a gear transmission system including: a housing, a rotating shaft arranged on the housing, a first gear coaxially arranged on the rotating shaft, a second gear coaxially arranged on the rotating shaft and rotatable relative to the rotating shaft, a rod arranged on the housing, a third gear coaxially arranged on the rod and slidable along the rod, and a positioning mechanism for positioning the third gear at a first position or a second position on the rod; when the gear is at the first position, the third gear meshes with the first gear and the second gear respectively; when the gear is at the second position, the third gear is separated from the second gear.

[0005] Further, it further includes a fourth gear coaxially arranged on the rotating shaft and rotatable relative to the rotating shaft; when the third gear is at the second position, the third gear meshes with the first gear and the fourth gear respectively.

[0006] Further, when the third gear is at a third position between the first position and the second position, the third gear meshes with the first gear, the second gear, and the fourth gear respectively.

[0007] Further, a jack extending in the radial direction of the rotating shaft is arranged on the rotating shaft, and a slot is formed on the first gear; a pin is inserted into the jack, and the pin is clamped in the slot.

[0008] Further, the second gear has a first tooth groove, the fourth gear has a second tooth groove, one end of the third gear has a first tooth part, and the other end of the third gear has a second tooth part; a first chamfer for guiding the first tooth part to slide into the first tooth groove is arranged at the edge of the first tooth groove, and a second chamfer for guiding the first tooth part to slide into the first tooth groove is arranged on the first tooth part;

[0009] And / or the edge of the second tooth groove is provided with a third chamfer for guiding the second tooth portion to slide into the second tooth groove, and the second tooth portion is provided with a fourth chamfer for guiding the second tooth portion to slide into the second tooth groove.

[0010] Furthermore, the sliding member is provided with a first baffle and a second baffle respectively located on the sliding path of the third gear, and the third gear is located between the first baffle and the second baffle.

[0011] Furthermore, the first baffle is provided with a first notch, and the first baffle is clamped on the rod body through the first notch; the second baffle is provided with a second notch, and the second baffle is clamped on the rod body through the second notch.

[0012] Further, the positioning mechanism includes: a seat body arranged on the shell, a sliding member, an abutment member, and an elastic member which are slidably arranged on the shell along a direction parallel to the extension direction of the rod body and used to move the third gear; a blind hole is arranged on the sliding member, the abutment member is slidably arranged in the blind hole, and the elastic member is arranged in the blind hole; one end of the elastic member abuts on the bottom wall of the blind hole, and the other end of the elastic member abuts on the abutment member; a plurality of recessed portions are arranged on the seat body, and the plurality of recessed portions are sequentially arranged on the sliding path where the abutment member contacts the seat body; when the third gear is located at the first position, the abutment member abuts against one of the recessed portions; when the third gear is located at the second position, the abutment member abuts against another of the recessed portions.

[0013] Furthermore, the abutment member is in a spherical shape.

[0014] Furthermore, the elastic member is a spring.

[0015] The beneficial effects of the gear transmission system provided by the present invention are as follows: compared with the prior art, the gear transmission system provided by the present invention has a rotating shaft arranged on a shell and can rotate around the axis of the rotating shaft, a first gear is arranged on the rotating shaft, and the first gear is arranged coaxially with the rotating shaft; a second gear is arranged on the rotating shaft, and the second gear can rotate relative to the rotating shaft; a rod body is arranged on the shell, a third gear is slidably arranged on the rod body, and the third gear is arranged coaxially with the rod body; the third gear can slide between a first position and a second position of the rod body; when the first gear slides to the first position, the third gear meshes with the first gear and the second gear, and the first gear drives the second gear to rotate through the third gear; when the first gear slides to the second position, the third gear is separated from the second gear, and the transmission relationship between the third gear and the second gear is disconnected; the connection and disconnection of the transmission between the first gear and the second gear are very simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 Stereoscopic schematic of the gear transmission system provided by the embodiment of the present invention Figure 1 ;

[0018] Figure 2 Stereoscopic schematic of the gear transmission system provided by the embodiment of the present invention Figure 2 ;

[0019] Figure 3 Exploded schematic of the gear transmission system provided by the embodiment of the present invention;

[0020] Figure 4 Stereoscopic assembly schematic of the first gear, the second gear, and the third gear provided by the embodiment of the present invention;

[0021] Figure 5 Stereoscopic assembly schematic of the third gear in the first position provided by the embodiment of the present invention;

[0022] Figure 6 Stereoscopic assembly schematic of the third gear in the second position provided by the embodiment of the present invention;

[0023] Figure 7 Stereoscopic assembly schematic of the third gear in the third position provided by the embodiment of the present invention;

[0024] Figure 8 Exploded schematic of the positioning mechanism provided by the embodiment of the present invention Figure 1 ;

[0025] Figure 9 Exploded schematic of the positioning mechanism provided by the embodiment of the present invention Figure 2 ;

[0026] Figure 10 Installation schematic of the abutting member provided by the embodiment of the present invention;

[0027] Figure 11 Installation schematic of the elastic member provided by the embodiment of the present invention;

[0028] Figure 12 is Figure 4 Enlarged schematic at position A in

[0029] Figure 13 is Figure 4 Enlarged schematic at position B in

[0030] Among them, the reference numerals in the figure are:

[0031] 1-housing; 2-shaft; 31-first gear; 32-second gear; 321-first chamfer; 322-first tooth groove; 33-third gear; 331-first tooth portion; 3311-second chamfer; 332-second tooth portion; 3321-fourth chamfer; 34-fourth gear; 341-third chamfer; 342-second tooth groove; 4-rod; 5-sliding member; 51-first baffle; 511-first notch; 52-second baffle; 521-second notch; 53-blind hole; 54-abutment member; 55-elastic member; 56-moving portion; 6-seat; 61-recessed portion. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] Please also read Figures 1 to 11, the gear transmission system provided by the present invention will now be described. The gear transmission system includes: a housing 1, a rotating shaft 2 provided on the housing 1, a first gear 31 coaxially provided on the rotating shaft 2, a second gear 32 coaxially provided on the rotating shaft 2 and capable of rotating relative to the rotating shaft 2, a rod 4 provided on the housing 1, a third gear 33 coaxially provided on the rod 4 and capable of sliding along the rod 4, and a positioning mechanism for positioning the third gear 33 at a first position or a second position on the rod 4; when the gear is in the first position, the third gear 33 meshes with the first gear 31 and the second gear 32 respectively; when the gear is in the second position, the third gear 33 is separated from the second gear 32.

[0037] In this way, the rotating shaft 2 is provided on the housing 1 and can rotate around the axis of the rotating shaft 2. The first gear 31 is provided on the rotating shaft 2, and the first gear 31 is coaxially provided with the rotating shaft 2; the second gear 32 is provided on the rotating shaft 2, and the second gear 32 can rotate relative to the rotating shaft 2; the rod 4 is provided on the housing 1, and the third gear 33 slides on the rod 4, and the third gear 33 is coaxially provided with the rod 4; the third gear 33 can slide between the first position and the second position of the rod 4; when the first gear 31 slides to the first position, the third gear 33 meshes with the first gear 31 and the second gear 32, and the first gear 31 drives the second gear 32 to rotate through the third gear 33; when the first gear 31 slides to the second position, the third gear 33 is separated from the second gear 32, and the transmission relationship between the third gear 33 and the second gear 32 is disconnected; the connection and disconnection of the transmission between the first gear 31 and the second gear 32 are very simple.

[0038] Further, please refer to Figures 1 to 11 , as a specific embodiment of the gear transmission system provided by the present invention, it further includes a fourth gear 34 coaxially provided on the rotating shaft 2 and capable of rotating relative to the rotating shaft 2; when the third gear 33 is in the second position, the third gear 33 meshes with the first gear 31 and the fourth gear 34 respectively. In this way, the fourth gear 34 is provided on the rotating shaft 2, and the fourth gear 34 can rotate relative to the rotating shaft 2; when the third gear 33 slides to the second position, the third gear 33 meshes with the first gear 31 and the fourth gear 34, and the first gear 31 drives the fourth gear 34 to rotate through the third gear 33.

[0039] Further, please refer to Figures 1 to 11, as a specific embodiment of the gear transmission system provided by the present invention, when the third gear 33 is located at a third position between the first position and the second position, the third gear 33 meshes with the first gear 31, the second gear 32, and the fourth gear 34 respectively. Thus, when the third gear 33 slides to the third position, the third gear 33 meshes with the first gear 31, the second gear 32, and the fourth gear 34 respectively, enabling the first gear 31 to drive the second gear 32 and the fourth gear 34 to rotate simultaneously through the third gear 33.

[0040] Optionally, in one embodiment, a first mounting hole is provided on the second gear 32, and the second gear 32 is sleeved on the rotating shaft 2 through the first mounting hole; a second mounting hole is provided on the fourth gear 34, and the fourth gear 34 is sleeved on the rotating shaft 2 through the second mounting hole; and / or a third mounting hole is provided on the third gear 33, and the third gear 33 is sleeved on the rod body 4 through the third mounting hole. Thus, the second gear 32 is sleeved on the rotating shaft 2 through the first mounting hole, making it difficult for the second gear 32 to disengage from the rotating shaft 2; the fourth gear 34 is sleeved on the rotating shaft 2 through the second mounting hole, making it difficult for the fourth gear 34 to disengage from the rotating shaft 2; the third gear 33 is sleeved on the rod body 4 through the third mounting hole, making it difficult for the third gear 33 to disengage from the rod body 4.

[0041] Further, please refer to Figures 1 to 11 , as a specific embodiment of the gear transmission system provided by the present invention, a jack extending in the radial direction of the rotating shaft 2 is provided on the rotating shaft 2, and a slot is provided on the first gear 31; a pin is inserted into the jack, and the pin is clamped in the slot. Thus, the pin is inserted into the jack and clamped in the slot on the first gear 31, so that there is no relative rotation between the first gear 31 and the rotating shaft 2, and it is easy to disassemble the first gear 31 and the rotating shaft 2 from each other, and only the pin clamped in the slot of the first gear 31 needs to be pulled out.

[0042] Specifically, in one embodiment, the first gear 31 is sleeved on the rotating shaft 2 through an assembly hole.

[0043] Specifically, in one embodiment, the first gear 31 is located between the second gear 32 and the fourth gear 34. Thus, the third gear 33 meshing with the first gear 31 can very conveniently cooperate with the second gear 32 or the fourth gear 34 respectively.

[0044] Specifically, in one embodiment, the rotating shaft 2 and the rod body 4 are arranged in parallel. Thus, when the third gear 33 on the rod body 4 slides along the rod body 4, the meshing state between the third gear 33 and the first gear 31 can be kept stable.

[0045] Specifically, in one embodiment, the outer diameters of the second gear 32 and the fourth gear 34 are the same. In this way, the states of the second gear 32 and the fourth gear 34 meshing with the third gear 33 respectively can be more consistent.

[0046] Specifically, in one embodiment, the aperture diameter of the third mounting hole is the same as the outer diameter of the rod body 4. In this way, when the third gear 33 is sleeved on the rod body 4 through the third mounting hole, it is not easy for the third gear 33 and the rod body 4 to shake relative to each other.

[0047] Further, please refer to Figures 1 to 13 , as a specific implementation manner of the gear transmission system provided by the present invention, the second gear 32 has a first tooth groove 322, the fourth gear 34 has a second tooth groove 342, one end of the third gear 33 has a first tooth portion 331, and the other end of the third gear 33 has a second tooth portion 332; a first chamfer 321 for guiding the first tooth portion 331 to slide into the first tooth groove 322 is provided at the edge of the first tooth groove 322, and a second chamfer 3311 for guiding the first tooth portion 331 to slide into the first tooth groove 322 is provided on the first tooth portion 331; and / or a third chamfer 341 for guiding the second tooth portion 332 to slide into the second tooth groove 342 is provided at the edge of the second tooth groove 342, and a fourth chamfer 3321 for guiding the second tooth portion 332 to slide into the second tooth groove 342 is provided on the second tooth portion 332. In this way, the first tooth portion 331 of the third gear 33 can slide into the first tooth groove 322 under the guidance of the first chamfer 321 at the edge of the first tooth groove 322. After the first tooth portion 331 of the third gear 33 slides into the first tooth groove 322, the meshing of the third gear 33 and the second gear 32 can be achieved, which is very convenient; the first tooth portion 331 can more easily slide into the first tooth groove 322 under the guidance of the second chamfer 3311, and then the meshing of the third gear 33 and the second gear 32 can be achieved, which is very convenient; the second tooth portion 332 of the third gear 33 can slide into the second tooth groove 342 under the guidance of the third chamfer 341 at the edge of the second tooth groove 342. After the second tooth portion 332 of the third gear 33 slides into the second tooth groove 342, the meshing of the third gear 33 and the fourth gear 34 can be achieved, which is very convenient; the second tooth portion 332 can more easily slide into the second tooth groove 342 under the guidance of the fourth chamfer 3321, and then the meshing of the third gear 33 and the fourth gear 34 can be achieved, which is very convenient.

[0048] Specifically, in one embodiment, the first chamfer 321 is a rounded chamfer.

[0049] Specifically, in one embodiment, the second chamfer 3311 is a rounded chamfer.

[0050] Specifically, in one embodiment, the third chamfer 341 is a rounded chamfer.

[0051] Specifically, in one embodiment, the fourth chamfer 3321 is a rounded corner.

[0052] For further information, see Figures 1 to 11 As a specific embodiment of the gear transmission system provided by the present invention, the positioning mechanism includes: a seat body 6 arranged on the housing 1, a sliding member 5 slidably arranged on the housing 1 along a direction parallel to the extension direction of the rod body 4 and used to move the third gear 33, an abutment member 54, and an elastic member 55; a blind hole 53 is arranged on the sliding member 5, the abutment member 54 is slidably arranged in the blind hole 53, and the elastic member 55 is arranged in the blind hole 53; one end of the elastic member 55 abuts on the bottom wall of the blind hole 53, and the other end of the elastic member 55 abuts on the abutment member 54; a plurality of recessed portions 61 are arranged on the seat body 6, and the plurality of recessed portions 61 are sequentially arranged on the sliding path where the abutment member 54 contacts the seat body 6; when the third gear 33 is located at the first position, the abutment member 54 abuts in one recessed portion 61; when the third gear 33 is located at the second position, the abutment member 54 abuts in another recessed portion 61. In this way, the sliding member 5 slides on the housing 1 in a direction parallel to the extending direction of the rod body 4, and the sliding member 5 drives the third gear 33 to slide along the rod body 4 during the sliding process (because the third gear 33 is slidably arranged on the rod body 4, the third gear 33 can be driven as long as the sliding member 5 is located on the moving path of the third gear 33; or the sliding member 5 can also drive the third gear 33 when it is connected to the third gear 33); an abutment member 54 is slidably arranged in the blind hole 53 on the sliding member 5, and the abutment member 54 abuts against the seat body 6 through the elastic member 55 in the blind hole 53; when the sliding member 5 slides, the abutment member 54 is 54 contacts the seat body 6 and slides along the surface of the seat body 6; a plurality of recessed portions 61 are provided on the seat body 6, and the plurality of recessed portions 61 are sequentially arranged on the sliding path of the abutment 54 on the seat body 6, so that the abutment 54 will be sequentially stuck in the plurality of recessed portions 61 during the sliding process along the surface of the seat body 6; when the abutment 54 is stuck in any one of the recessed portions 61, the recessed portion 61 can position the sliding member 5 through the abutment 54, thereby preventing the sliding member 5 from sliding relative to the seat body 6, and when the abutment 54 slides out of the recessed portion 61, the restriction of the recessed portion 61 on the abutment 54 can be released.

[0053] Optionally, in one embodiment, the sliding member 5 has a toggle portion 56 for a user to toggle by hand, and the blind hole 53 is provided on the toggle portion 56 .

[0054] Optionally, in one embodiment, the predetermined path is a straight line.

[0055] Optionally, in one embodiment, the seat body 6 and the sliding member 5 are respectively metal members.

[0056] For further information, see Figures 1 to 11, as a specific embodiment of the gear transmission system provided by the present invention, the abutting member 54 is spherical. In this way, the rotation of the abutting member 54 during the sliding process reduces the resistance of the abutting member 54 in contact with the seat body 6; when the abutting member 54 rolls by itself during the sliding process, it is easy to slide into or out of the recess 61.

[0057] Further, please refer to Figures 1 to 11 , as a specific embodiment of the gear transmission system provided by the present invention, the elastic member 55 is a spring. In this way, the cost is low and the installation is convenient.

[0058] Optionally, in one embodiment, the elastic member 55 is a columnar spring. In this way, the columnar spring can be installed by inserting it into the blind hole 53, which is very convenient.

[0059] Optionally, in one embodiment, the predetermined path extends in a straight line direction. In this way, the sliding member 5 is not likely to encounter blockage during the sliding process.

[0060] Optionally, in one embodiment, the blind hole 53 extends in a straight line direction, and the extending direction of the blind hole 53 is perpendicular to the predetermined path. In this way, when the abutting member 54 in the blind hole 53 abuts against the seat body 6 and moves along the blind hole 53, the abutting member 54 is not likely to slide laterally relative to the seat body 6.

[0061] Optionally, in one embodiment, the number of the recesses 61 is three. In this way, when the abutting member 54 is respectively clamped into the three recesses 61, the three recesses 61 can respectively position the abutting member 54 at three different positions. Specifically, in one embodiment, when the abutting member 54 is respectively located in the three recesses 61, the sliding member 5 moves the third gear 33 to the first position, the second position, and the third position respectively.

[0062] Further, please refer to Figures 1 to 11 , as a specific embodiment of the gear transmission system provided by the present invention, each recess 61 is respectively in the shape of a groove. In this way, the recess 61 is relatively convenient to process.

[0063] Optionally, in one embodiment, the extending directions of the respective recesses 61 are respectively arranged in parallel. In this way, the state of the abutting member 54 clamped between the respective recesses 61 can be maintained more consistently.

[0064] Optionally, in one embodiment, any two adjacent recesses 61 are in contact with each other. In this way, the abutting member 54 can be continuously and sequentially clamped into any two adjacent recesses 61, improving the continuous positioning of the recess 61 on the abutting member 54.

[0065] Further, please refer to Figures 1 to 11, as a specific implementation of the gear transmission system provided by the present invention, a first baffle 51 and a second baffle 52 are provided on the sliding member 5, which are respectively located on the sliding path of the third gear 33, and the third gear 33 is located between the first baffle 51 and the second baffle 52. In this way, the third gear 33 is restricted between the first baffle 51 and the second baffle 52, which is beneficial to maintaining the stability of the position of the third gear 33 relative to the rod body 4; when the sliding member 5 is sliding, the third gear 33 restricted between the first baffle 51 and the second baffle 52 moves along with the sliding member 5.

[0066] Further, please refer to Figures 1 to 11 , as a specific implementation of the gear transmission system provided by the present invention, a first notch 511 is provided on the first baffle 51, and the first baffle 51 is clamped on the rod body 4 through the first notch 511; a second notch 521 is provided on the second baffle 52, and the second baffle 52 is clamped on the rod body 4 through the second notch 521. In this way, the first baffle 51 on the sliding member 5 is clamped on the rod body 4 through the first notch 511, and the second baffle 52 on the sliding member 5 is clamped on the rod body 4 through the second notch 521, which facilitates the sliding of the sliding member 5 along the rod body 4.

[0067] Specifically, in one embodiment, a limiting hole is opened on the housing 1, and the sliding member 5 is inserted into the limiting hole. In this way, the limiting hole can play a limiting role during the sliding process of the sliding member 5. In addition, the sliding member 5 being inserted into the limiting hole also makes it difficult for the sliding member 5 to rotate relative to the rod body 4 under the restriction of the limiting hole.

[0068] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gear transmission system, characterized in that, include: A housing, a rotating shaft arranged on the housing, a first gear coaxially arranged on the rotating shaft, a second gear coaxially arranged on the rotating shaft and rotatable relative to the rotating shaft, a rod body arranged on the housing and parallel to the rotating shaft, a third gear coaxially arranged on the rod body and slidable along the rod body, a seat body arranged on the housing, a sliding member, an abutment member, and an elastic member slidably arranged on the housing in a direction parallel to the extension direction of the rod body and used to shift the third gear; when the third gear is located at the first position, the third gear is meshed with the first gear and the second gear respectively; when the third gear is located at the second position, the third gear is separated from the second gear; the abutment member is slidably arranged in a blind hole on the sliding member, and the abutment member abuts against the seat body through the elastic member in the blind hole; when the sliding member slides, the abutment member contacts the seat body and slides along the surface of the seat body; a plurality of recessed parts are arranged on the seat body, and the plurality of recessed parts are sequentially arranged on the sliding path where the abutment member contacts the seat body.

2. The gear transmission system according to claim 1, wherein, It also includes a fourth gear which is coaxially arranged on the rotating shaft and can rotate relative to the rotating shaft; when the third gear is located at the second position, the third gear is meshed with the first gear and the fourth gear respectively.

3. The gear transmission system according to claim 2, wherein, When the third gear is located at a third position between the first position and the second position, the third gear is meshed with the first gear, the second gear, and the fourth gear respectively.

4. The gear transmission system according to claim 1, characterized in that, The rotating shaft is provided with a plug hole extending in the radial direction of the rotating shaft, and the first gear is provided with a slot; a latch is inserted into the plug hole, and the latch is clamped in the slot.

5. The gear transmission system according to claim 2, characterized in that, The second gear has a first tooth groove, the fourth gear has a second tooth groove, one end of the third gear has a first tooth portion, and the other end of the third gear has a second tooth portion; the edge of the first tooth groove is provided with a first chamfer for guiding the first tooth portion to slide into the first tooth groove, and the first tooth portion is provided with a second chamfer for guiding the first tooth portion to slide into the first tooth groove; And / or the edge of the second tooth groove is provided with a third chamfer for guiding the second tooth portion to slide into the second tooth groove, and the second tooth portion is provided with a fourth chamfer for guiding the second tooth portion to slide into the second tooth groove.

6. The gear transmission system according to any one of claims 1 to 5, characterized in that, One end of the elastic member abuts against the bottom wall of the blind hole, and the other end of the elastic member abuts against the abutment member; when the third gear is located at the first position, the abutment member abuts against one of the recessed portions; when the third gear is located at the second position, the abutment member abuts against another of the recessed portions.

7. The gear transmission system according to claim 6, wherein, The abutment member is in a spherical shape.

8. The gear transmission system according to claim 6, characterized in that, The elastic member is a spring.

9. The gear transmission system according to claim 6, wherein The sliding member is provided with a first baffle and a second baffle respectively located on the sliding path of the third gear, and the third gear is located between the first baffle and the second baffle.

10. The gear transmission system according to claim 9, characterized in that, The first baffle is provided with a first notch, and the first baffle is clamped on the rod body through the first notch; the second baffle is provided with a second notch, and the second baffle is clamped on the rod body through the second notch.

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