Gear double-side slipping device

Abstract

The utility model discloses a gear double-side slipping device, which comprises a slipping gear, a transmission gear, a spring and an ejector rod connected with one end of the spring, the slipping gear comprises a limiting frame, a plurality of limiting grooves are arranged on the limiting frame along the circumferential direction, the spring and the ejector rod are positioned in the limiting grooves, and the other end of the spring is connected with the slipping gear. A limiting assembly enabling the ejector rod to slide in the axial direction of the spring is arranged between the limiting groove and the ejector rod, and when the device is in a non-slipping state, the abutting face of the ejector rod and the transmission gear is of a mirror symmetry structure with the plane formed by the spring and the center shaft of the slipping gear as the symmetry center. The limiting frame with the limiting groove is additionally arranged on a traditional slipping gear, the contact faces of the ejector rod and the transmission gear are symmetrically arranged, when slipping is conducted in the forward direction or the reverse direction, the ejector rod operates in a sliding mode, the force of compression springs on the two sides is the same, and therefore it is guaranteed that slipping force is the same.

Description

Technical Field

[0001] The utility model relates to the technical field of gear overload protection, in particular to a double-side slip device for gears. Background Art

[0002] The gear slip device is an overload protection structure set up to avoid damage to components caused by excessive external force. Traditional gear slip devices are mostly based on simple cantilever structures. However, the cantilever structure has the problem of unbalanced slip force when slipping in the forward and reverse directions, that is, the slip force is relatively small along the cantilever direction, and vice versa. For this reason, the prior art also has a slip device that uses a spring and a limit block to form an elastic component. However, since the limit block only relies on the end face of the transmission gear for limitation and the contact surface between the limit block and the transmission gear is not limited, the movement stability of the limit block is poor, and it cannot ensure that the slip force is the same when slipping in the forward and reverse directions. Utility Model Content

[0003] In order to solve the technical problem in the prior art that the gear slipping device has different slipping forces when slipping in the forward and reverse directions, the utility model provides a gear double-side slipping device to solve the above problem.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a double-sided gear slipping device, including a slipping gear, a transmission gear, a spring and a push rod connected to one end of the spring, the slipping gear includes a limit frame, the limit frame is arranged with a plurality of limit grooves along the circumferential direction, the spring and the push rod are located in the limit groove, the other end of the spring is connected to the slipping gear, the spring presses the push rod until it abuts against the surface of the transmission gear, so that there is a locking force between the slipping gear and the transmission gear to prevent the two from relative rotation.

[0005] A limiting assembly is provided between the limiting groove and the push rod to enable the push rod to slide along the axial direction of the spring, and when the device is in a non-slip state, the abutting surface between the push rod and the transmission gear is a mirror-symmetrical structure with the plane formed by the central axis of the spring and the slipping gear as the symmetry center.

[0006] Furthermore, an arc-shaped boss is provided at one end of the push rod facing the inner circumference of the transmission gear, and a plurality of inner grooves cooperating with the arc-shaped boss are arranged in a circular array on the inner circumference of the transmission gear, and the arc-shaped boss and the inner groove are symmetrically arranged with the radial line of the slipping gear as the center.

[0007] Furthermore, the diameter of the arc-shaped boss is the same as the diameter of the inner groove.

[0008] Furthermore, the inner circumferential surface of the transmission gear is provided with an inner boss located between two adjacent inner grooves, and the inner boss is an arc-shaped structure with the same diameter as the arc-shaped boss and the opposite protruding direction.

[0009] Furthermore, the arc length of the inner groove and the inner boss is less than or equal to the circumferential length corresponding to the diameter.

[0010] Furthermore, the limiting assembly includes limiting arms located on both sides of the top rod and guide ribs located on the limiting groove and slidably matched with the limiting arms.

[0011] Furthermore, the two limiting arms located on both sides of the push rod are symmetrically arranged relative to the symmetry center of the arc-shaped boss.

[0012] Furthermore, the limiting arms located on each side of the push rod include an upper arm and a lower arm located above and below the guide rib.

[0013] Furthermore, the slipping gear is provided with a first support column matched with one end of the spring, and the push rod is provided with a second support column matched with the other end of the spring.

[0014] Furthermore, the slipping gear includes a toothed portion fixed to one end of a limit frame, the toothed portion passes through a center hole of the transmission gear, the limit frame has a limit end face in contact with one end of the transmission gear and a buckle engaged with the other end of the transmission gear, and the end face of the push rod does not contact the transmission gear.

[0015] Furthermore, the limiting frame includes a mounting plate located in the center and connected to the toothed portion and an outer frame located at the outer periphery of the mounting plate, the limiting groove is located on the outer frame, and a weight reduction groove is provided on the surface of the outer frame between two adjacent limiting grooves.

[0016] Furthermore, the outer peripheral surface of the limiting frame located between adjacent limiting grooves is an arc-shaped surface that contacts and cooperates with the inner boss.

[0017] The beneficial effects of the utility model are:

[0018] (1) The utility model adds a limit frame with a limit slot on the traditional slipping gear. The limit assembly between the limit slot and the push rod is set to ensure the linear movement of the push rod, thereby improving the control of the locking force accuracy. In addition, through the symmetrical arrangement of the contact surface between the push rod and the transmission gear, when slipping in the forward or reverse direction, the push rod moves in a sliding manner, and the force of the compression springs on both sides is the same, thus ensuring the same slipping force.

[0019] (2) The utility model provides an arc-shaped boss, a groove and an inner boss to enable the push rod and the transmission gear to have an arc-shaped contact mode, thereby ensuring the stability and reliability of the contact between the two and a smooth transition when slipping. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] Figure 1It is an exploded view of a specific implementation of the double-sided gear slipping device of the utility model;

[0022] Figure 2 It is a three-dimensional diagram of the slipping gear in the utility model;

[0023] Figure 3 It is a three-dimensional diagram of the limiting frame in the utility model;

[0024] Figure 4 It is a three-dimensional diagram of the push rod in the utility model (observed from the head);

[0025] Figure 5 It is a three-dimensional diagram of the push rod in the utility model (observed from the tail);

[0026] Figure 6 It is a three-dimensional diagram of the transmission gear in the utility model;

[0027] Figure 7 This is an assembly diagram of the double-sided gear slipping device of the utility model when no slipping occurs (the toothed portion is not shown);

[0028] Figure 8 yes Figure 7 Axial cross-sectional view of

[0029] Fig. 9 This is an assembly diagram of the double-sided gear slipping device of the utility model when slipping occurs (the toothed portion is not shown);

[0030] Fig.10 This is an assembly diagram of the double-sided gear slipping device of the utility model when no slipping occurs (the toothed portion is not shown);

[0031] Fig.11 It is a front view of the ejector rod of the utility model;

[0032] Fig.12 It is a schematic diagram of the left end face of the ejector rod of the utility model;

[0033] Fig.13 It is a schematic diagram of the right end surface of the push rod of the utility model;

[0034] Fig.14 It is a schematic diagram of the matching relationship between the limit arm and the guide rib in the utility model;

[0035] Fig.15 It is a schematic diagram of the structure of the inner groove and inner boss in the transmission gear;

[0036] Fig.16 It is a schematic diagram of the position of the arc-shaped boss, the inner groove and the inner boss.

[0037] In the figure, 1, sliding gear, 11, shaft hole, 12, toothed portion, 13, buckle, 14, limit end surface, 15, outer support wall, 16, guide rib, 161, left guide rib, 162, right guide rib, 17, first support column, 18, limit frame, 181, mounting plate, 182, outer frame, 1821, weight reduction groove, 19, limit groove, 2, push rod, 21, arc boss, 211, left arc, 212, right arc, 22, top surface, 23, limit Arm, 231, left limiting arm, 2311, left upper limiting arm, 2312, left lower limiting arm, 232, right limiting arm, 2321, right upper limiting arm, 2322, right lower limiting arm, 24, second support column, 3, transmission gear, 31, middle hole, 32, inner end surface, 33, limiting plate, 34, inner boss, 341, left half boss, 342, right half boss, 35, inner groove, 351, left groove, 352, right groove, 36, outer end surface, 4, spring. DETAILED DESCRIPTION

[0038] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0039] The gear slipping device generally includes a slipping gear 1 and a transmission gear 3. The slipping gear 1 is connected to the client end, and the transmission gear 3 is connected to the driving end. Under normal conditions, the transmission gear 3 and the slipping gear 1 rotate synchronously. When the driving end starts, the client end can be driven to move through the transmission gear 3 and the slipping gear 1 in sequence. When the client end is suddenly subjected to external force, the slipping gear 1 and the transmission gear 3 slip and rotate relative to each other, which can avoid transmitting torque to the driving end and protect the driving device and the gear. The slipping gear 1 is provided with a toothed portion 12, and the transmission gear 3 is provided with a middle hole 31 for the toothed portion 12 to pass through. The external teeth on the toothed portion 12 cooperate with the driving end, and a limit plate 33 is provided at one end of the transmission gear 3. The slipping gear 1 has a mounting plate 181 that contacts the end surface of one end of the limit plate 33, and a buckle 13 that is buckled with the other end of the limit plate 33 is provided on the mounting plate 181. The buckle 13 is arranged in a circular array with the shaft hole 11 of the slipping gear 1 as the center.

[0040] The double-sided gear slipping device described in the utility model is as follows: Figure 1-Figure 3As shown, it also includes a spring 4 and a push rod 2 connected to one end of the spring 4, the slipping gear 1 has a limit frame 18, and the limit frame 18 is arranged with a plurality of limit grooves 19 along the circumferential direction. The opening direction of the limit groove 19 faces the transmission gear 3, so that a space for the spring 4 and the push rod 2 to move is formed between the limit groove 19 and the transmission gear 3. The spring 4 and the push rod 2 are located in the limit groove 19, and the other end of the spring 4 is connected to the slipping gear 1. The spring 4 presses the push rod 2 to abut against the surface of the transmission gear 3, so that there is a locking force between the slipping gear 1 and the transmission gear 3 to prevent the two from rotating relative to each other. The locking force enables the driving end to drive the client to work, and when the torque generated by the external force on the client is greater than the locking force, the slipping gear 1 and the transmission gear 3 rotate relative to each other.

[0041] There is a limiting assembly between the limiting groove 19 and the push rod 2 to enable the push rod 2 to slide along the axial direction of the spring 4, and when the device is in a non-slip state, the abutment surface between the push rod 2 and the transmission gear 3 is a mirror-symmetrical structure with the plane formed by the central axis of the spring 4 and the slipping gear 1 as the symmetry center.

[0042] In the traditional structure, the push rod 2 is only limited by the structure of the transmission gear 3 itself. Since the distance between the push rod 2 and the transmission gear 3 is large, it is difficult to ensure the linear movement of the push rod 2. The utility model sets a limit assembly to make the limit groove 19 slide with the push rod 2, reduce the matching clearance, and improve the movement accuracy. The contact surface setting of the mirror symmetrical structure makes the force of the compression spring 4 on both sides the same when slipping in the forward or reverse direction, ensuring the same slipping force. In a further design, the end face (top end face 22) of the push rod 2 facing the limit plate 33 does not contact the transmission gear 3, thereby reducing the friction of the push rod 2 during movement.

[0043] like Figure 3 As shown, the interior of the limit frame 18 is a mounting plate 181, and the periphery is an outer frame 182. The limit frame 18 as a whole is a complete frame structure to ensure operational stability and assembly reliability. The limit groove 19 is located on the outer frame 182, and a weight reduction groove 1821 is provided on the surface of the outer frame 182 between two adjacent limit grooves 19.

[0044] The transmission gear 3 and the slipping gear 1 are preferably arranged coaxially. Usually, the slipping gear 1 connected to the client end has a smaller diameter, and the transmission gear 3 matched with the driving end has a larger diameter. Therefore, the push rod 2 abuts against the inner circumference of the transmission gear 3.

[0045] The utility model uses the spring 4 which is easy to assemble as the elastic expansion component, and does not need to set a complicated assembly structure on the slipping gear 1. The assembly structure of the spring 4 adopted by the utility model is: the slipping gear 1 is provided with a first support column 17 which matches with one end of the spring 4, and the top rod 2 is provided with a second support column 24 which matches with the other end of the spring 4.

[0046] The limit assembly may be but is not limited to the following structure: Figure 5 and Fig. 9 As shown, it includes limiting arms 23 located on both sides of the top rod 2 and guide ribs 16 located on the limiting groove 19 and slidingly matched with the limiting arms 23. The limiting arms 23 and the guide ribs 16 enable the limiting groove 19 to limit the top rod 2 in the vertical and horizontal directions. The guide ribs 16 on both sides are preferably arranged symmetrically with respect to the horizontal center line and the vertical center line of the second support column 24 or the first support column 17, as shown in FIG. Fig.14 As shown, the left guide rib 161 and the right guide rib 162 are symmetrically distributed on both sides of the top rod 2 with respect to the vertical center line of the second support column 24 .

[0047] like Fig.11 As shown, the limiting arms 23 on both sides are also symmetrically distributed along the vertical center line, namely the left limiting arm 231 and the right limiting arm 232; and the limiting arm 23 on one side is symmetrically distributed along the horizontal center line in the up and down directions with an upper arm and a lower arm, for example, Fig.12 and Fig.13 As shown, the left limiting arm 231 can be divided into a left upper limiting arm 2311 and a left lower limiting arm 2312, and the right limiting arm 232 can be divided into a right upper limiting arm 2321 and a right lower limiting arm 2322. Fig.14 The diagram shows the cooperation between the limit arms 23 on both sides of the push rod 2 and the guide ribs 16 on both sides of the slipping gear 1. The left upper limit arm 2311 and the left lower limit arm 2312 of the push rod 2 cooperate with the guide rib 16 on the left side, and the right upper limit arm 2321 and the right lower limit arm 2322 cooperate with the guide rib 16 on the right side; the cooperation between the limit arms 23 on both sides and the guide rib 16 limits the vertical and horizontal displacement of the push rod 2, and both sides are clearance fit to ensure the smoothness of the push rod 2 when moving forward and backward.

[0048] After the spring 4 squeezes the push rod 2, the push rod 2 abuts against the surface of the transmission gear 3 to increase the rotational friction force, thereby forming the locking force. In order to increase the locking force, a friction surface can be set on the contact surface of the push rod 2 and the transmission gear 3. In the preferred embodiment of the utility model, the contact surface of the push rod 2 and the transmission gear 3 adopts the following structure: Figure 4 , Figure 6 and Fig.10 As shown, an arc-shaped boss 21 is provided at one end of the push rod 2 facing the inner circumference of the transmission gear 3, and a plurality of inner grooves 35 cooperating with the arc-shaped boss 21 are arranged in a circumferential array on the inner circumference of the transmission gear 3. The arc-shaped boss 21 and the inner groove 35 are symmetrically arranged with the radial line of the slipping gear 1 as the center. The blocking of the inner groove 35 structure is used to increase the locking force, and the locking force at this time mainly comes from the elastic reset force of the spring 4. The inner grooves 35 arranged in a circumferential array make the structure more symmetrical. It is preferred that the diameter of the arc-shaped boss 21 is the same as the diameter of the inner groove 35.

[0049] The edge of the inner groove 35 is chamfered to allow the spring 4 to slide out smoothly. In the specific embodiment of the utility model, the inner circumference of the transmission gear 3 is provided with an inner boss 34 located between two adjacent inner grooves 35. The inner boss 34 is an arc-shaped structure with the same diameter as the arc-shaped boss 21 and the opposite protrusion direction. At the same time, the outer circumference of the limit frame 18 located between adjacent limit grooves 19 is an arc-shaped surface that contacts and cooperates with the inner boss 34. Fig. 9 As shown, during the slipping process, the outer support wall 15 of the slipping gear 1 contacts and cooperates with the inner boss 34 of the transmission gear 3 to ensure the reliability of the slipping gear 1 in the circumferential direction of rotation.

[0050] Fig.11 The arc-shaped boss 21 is symmetrically distributed along the center line (the center line passes through the center of the slipping gear 1, that is, the radial line of the slipping gear 1), and is divided into a left arc 211 and a right arc 212. The vertical center line of the limit arm 23 is the same as the center line of the arc-shaped boss 21. At the same time, the diameter of the circle where the semicircular boss is located is set to A. The inner groove 35 can be divided into a left groove 351 and a right groove 352 with the line connecting the center of the circle and the center of the middle hole 31 as the center line; Fig.15 As shown, assuming that the diameter of the circle where the inner groove 35 is located is B, the inner boss 34 can be divided into a left half boss 341 and a right half boss 342 with the line connecting the center of the circle and the center of the middle hole 31 as the center line, and the diameter of the circle where the inner boss 34 is located is C. Fig.16 The position diagram of the arc-shaped boss 21 on the head of the push rod 2 and the inner groove 35 and the inner boss 34 of the transmission gear 3 is shown as follows:

[0051] ① The arc-shaped boss 21 fits with the inner groove 35, and its left arc 211 and right arc 212 are in contact with the left groove 351 and the right groove 352 respectively, that is, the circle where the arc-shaped boss 21 is located is equal to the circle where the inner groove 35 is located, and the diameters of the two are A=B.

[0052] ② An inner boss 34 is provided on both adjacent sides of each inner groove 35, and the left arc 211 and the right arc 212 on both sides of the push rod 2 are respectively blocked by the left half boss 341 and the right half boss 342, and the circle where the inner boss 34 is located is equal to the circle where the inner groove 35 is located, that is, A=B=C; the contact mode of the inner concave circle and the inner convex circle ensures the stability and reliability of the contact between the two, as well as the smooth transition during slipping.

[0053] To ensure a smooth transition, preferably, the arc length of the inner groove 35 and the inner boss 34 is less than or equal to the circumferential length corresponding to the diameter.

[0054] The working principle of the utility model is described in detail below with reference to the schematic diagram:

[0055] like Figure 7 The figure shows the assembly diagram of the double-sided gear slip device when no slip occurs:

[0056] a. The toothed portion 12 of the slipping gear 1 passes through the center hole 31 of the transmission gear 3, so that its limiting end face 14 contacts and cooperates with the inner end face 32 of the limiting plate 33, and at the same time, its buckle 13 contacts and cooperates with the outer end face 36, so that the slipping gear 1 is connected to the transmission gear 3 in the axial direction, and the buckle 13 equally divided in the circumferential direction also ensures the reliability of the connection.

[0057] b. The arc-shaped boss 21 of the push rod 2 is in contact with the inner groove 35 of the transmission gear 3, and is adjacent to the inner boss 34 on both sides. At the same time, the limiting arms 23 on both sides of the push rod 2 are in contact with the guide ribs 16 of the slipping gear 1, so that the push rod 2 can slide back and forth along it, and the push rod 2 and the slipping gear 1 rotate synchronously in the circumferential direction.

[0058] c. The spring 4 is installed between the slipping gear 1 and the push rod 2, with one end of the spring cooperating with the first support column 17 of the slipping gear 1 and the other end cooperating with the second support column 24 of the push rod 2.

[0059] d. After the above-mentioned slipping gear 1, push rod 2, spring 4 and transmission gear 3 are assembled and connected, under the elastic force of spring 4, there is a locking force between the slipping gear 1 and the transmission gear 3 to prevent the two from rotating relative to each other.

[0060] like Fig. 9 The following is an assembly diagram of the double-sided gear slip device when slipping occurs:

[0061] a. When the slipping gear 1 is subjected to a large external force in the positive or reverse direction of the arrow shown in the figure, which exceeds the locking force of the gear slipping device, in order to protect the gear and other structural features, the slipping gear 1 and the transmission gear 3 will rotate relative to each other, thereby releasing the external force.

[0062] b. When the two rotate relative to each other, under the torque of the rotation of the slipping gear 1, the arc-shaped boss 21 of the push rod 2 disengages from the inner groove 35 of the transmission gear 3 and cooperates with the inner boss 34. During this process, the spring 4 is continuously compressed by the push rod 2 until the arc-shaped boss 21 of the push rod 2 contacts the top of the inner boss 34. At this time, the spring 4 is compressed to the maximum. As the slipping gear 1 continues to rotate, the arc-shaped boss 21 immediately contacts the next inner groove 35.

[0063] c. The arc-shaped boss 21 jumps from one inner groove 35 to another inner groove 35, which means that slippage occurs between the two. If they are continuously subjected to a large external force (exceeding the locking force of the two), such slippage will continue. At the same time, during the mutual slipping process, the outer support wall 15 of the slipping gear 1 contacts and cooperates with the inner boss 34 of the transmission gear 3, ensuring the reliability of the circumferential rotation of the slipping gear 1.

[0064] Until the external force disappears or is less than the locking force between the two, there will be no slippage, and finally the connection between the two returns to Fig.10 Status shown.

[0065] In the description of the present invention, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", "axial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying 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 operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0066] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0067] In this specification, the schematic representation of the terms does not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments.

[0068] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A double-sided gear slipping device, characterized in that: The invention comprises a slipping gear (1), a transmission gear (3), a spring (4) and a push rod (2) connected to one end of the spring (4); the slipping gear (1) comprises a limit frame (18); the limit frame (18) has a plurality of limit grooves (19) arranged along a circumferential direction; the spring (4) and the push rod (2) are located in the limit grooves (19); the other end of the spring (4) is connected to the slipping gear (1); the spring (4) presses the push rod (2) until it contacts the surface of the transmission gear (3), so that a locking force is provided between the slipping gear (1) and the transmission gear (3) to prevent the two from rotating relative to each other; A limiting assembly is provided between the limiting groove (19) and the push rod (2) to enable the push rod (2) to slide along the axial direction of the spring (4), and when the device is in a non-slip state, the abutment surface between the push rod (2) and the transmission gear (3) is a mirror-symmetrical structure with the plane formed by the central axis of the spring (4) and the slipping gear (1) as the symmetry center.

2. The double-sided gear slipping device according to claim 1, characterized in that: An arc-shaped boss (21) is provided at one end of the push rod (2) facing the inner circumferential surface of the transmission gear (3); a plurality of inner grooves (35) cooperating with the arc-shaped boss (21) are arranged in a circular array on the inner circumferential surface of the transmission gear (3); the arc-shaped boss (21) and the inner grooves (35) are symmetrically arranged with the radial line of the slipping gear (1) as the center.

3. The double-sided gear slipping device according to claim 2, characterized in that: The inner circumferential surface of the transmission gear (3) is provided with an inner boss (34) located between two adjacent inner grooves (35); the inner boss (34) is an arc-shaped structure having the same diameter as the arc-shaped boss (21) and protruding in the opposite direction.

4. The double-sided gear slipping device according to claim 3, characterized in that: The outer peripheral surface of the limiting frame (18) located between adjacent limiting grooves (19) is an arc-shaped surface that contacts and cooperates with the inner boss (34).

5. The double-sided gear slipping device according to claim 1, characterized in that: The limiting frame (18) comprises a mounting plate (181) located at the center and connected to the toothed portion (12), and an outer frame (182) located at the periphery of the mounting plate (181); the limiting groove (19) is located on the outer frame (182); and a weight-reducing groove (1821) is provided on the surface of the outer frame (182) between two adjacent limiting grooves (19).

6. The double-sided gear slipping device according to claim 2, characterized in that: The limiting assembly comprises limiting arms (23) located on both sides of the top rod (2) and guide ribs (16) located on the limiting groove (19) and slidably engaged with the limiting arms (23).

7. The double-sided gear slipping device according to claim 6, characterized in that: The two limiting arms (23) located on both sides of the push rod (2) are symmetrically arranged relative to the symmetry center of the arc-shaped boss (21).

8. The double-sided gear slipping device according to claim 7, characterized in that: The limiting arms (23) located on each side of the top rod (2) include an upper arm and a lower arm located above and below the guide rib (16).

9. The double-sided gear slipping device according to claim 1, characterized in that: The slipping gear (1) is provided with a first support column (17) that cooperates with one end of the spring (4), and the push rod (2) is provided with a second support column (24) that cooperates with the other end of the spring (4).

10. The double-sided gear slipping device according to claim 1, characterized in that: The slipping gear (1) comprises a toothed portion (12) fixed to one end of a limiting frame (18), the toothed portion passing through a center hole (31) of the transmission gear (3), the limiting frame (18) having a limiting end face (14) in contact with one end of the transmission gear (3) and a buckle (13) engaged with the other end of the transmission gear (3), and the end face of the push rod (2) does not contact the transmission gear (3).

11. The double-sided gear slipping device according to claim 2, characterized in that: The diameter of the arc-shaped boss (21) is the same as the diameter of the inner groove (35).

12. The double-sided gear slipping device according to claim 3, characterized in that: The arc lengths of the inner groove (35) and the inner boss (34) are less than or equal to the circumferential length corresponding to the diameter.

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