Gear shifting mechanism and inner speed change hub

Abstract

The utility model belongs to the technical field of internal transmissions, and particularly relates to a gear shifting mechanism and an internal speed change hub. The gear shifting mechanism comprises a gear shifting control piece, a gear shifting pawl and a gear shifting pawl seat, the gear shifting pawl seat is provided with a gear shifting pawl groove and arranged on a mandrel, the gear shifting pawl is installed in the gear shifting pawl groove and has the outward opening state and the inward folding state, the gear shifting control piece is provided with an opening groove, and the gear shifting pawl seat is arranged on the mandrel. The open groove is formed in the control part and used for controlling the gear shifting pawl to be unfolded or folded so that a sun gear of the transmission mechanism can be fixed or move, and the structure reinforcing piece is connected with the gear shifting control piece in a buckled mode. According to the gear shifting mechanism, the structural reinforcing piece connected with the gear shifting control piece in the buckled mode is arranged, the acting force borne by the gear shifting control piece is transmitted to the structural reinforcing piece, and therefore the acting force borne by the gear shifting control piece is shared, deformation is reduced, and the smaller the deformation amount is, the more accurate gear shifting is.

Description

Technical Field

[0001] This utility model belongs to the field of internal transmission technology, and specifically relates to a shifting mechanism and an internal transmission hub. Background Technology

[0002] Chinese patent document CN222315899U discloses a shifting mechanism and an internal gear hub. The shifting mechanism includes a shifting control component with an opening slot located in a control unit. The control unit alternately controls two shifting pawls.

[0003] However, the control unit cannot form a fully circular curved arm structure. During gear shifting, the shift pawl exerts a large force on the control unit. With long-term use, the shift pawl is prone to deformation, which will reduce the service life of the shifting mechanism.

[0004] Therefore, existing technologies need to be improved and developed. Utility Model Content

[0005] The purpose of this application is to provide a shifting mechanism and an internal gear hub that can reduce the deformation of the shifting control components, extend their service life, and make shifting more precise.

[0006] To solve the above-mentioned technical problems, this application provides a shifting mechanism, including a shifting control component, a shifting pawl, and a shifting pawl seat. The shifting pawl seat is provided with a shifting pawl groove and is disposed on a spindle. The shifting pawl is installed in the shifting pawl groove and has two states: outward opening and inward retraction. The shifting control component is provided with an opening slot and is disposed in a control part. The opening slot is used to control the opening or retraction of the shifting pawl so that the sun gear of the transmission mechanism is fixed or movable. The mechanism is characterized by further including a structural reinforcement component that is fastened and connected to the shifting control component.

[0007] Furthermore, the shift control component and the structural reinforcement component are connected by a first fastening structure and a second fastening structure, with the first fastening structure and the second fastening structure respectively disposed at both ends of the shift control component and the structural reinforcement component.

[0008] Furthermore, the first fastening structure includes a first fastening portion and a second fastening portion respectively disposed on the structural reinforcement and the shift control component, wherein the cross-sectional shapes of the first fastening portion and the second fastening portion are complementary;

[0009] The second fastening structure includes a third fastening portion and a fourth fastening portion respectively disposed on the structural reinforcement and the shift control component, wherein the cross-sectional shapes of the third fastening portion and the fourth fastening portion are complementary.

[0010] Furthermore, the structural reinforcement includes at least one connecting arm and a connecting rod, the connecting rod being connected to the connecting arm, the first fastening portion being disposed at the end of the connecting arm, and the second fastening portion being disposed at the end of the connecting rod.

[0011] Furthermore, the structural reinforcement includes at least one connecting arm and a connecting rod, the connecting rod being connected to the connecting arm, the second fastening portion being disposed at the end of the connecting arm, and the first fastening portion being disposed at the end of the connecting rod.

[0012] Furthermore, the first fastening part is a concave part, the second fastening part is a convex part, the third fastening part is a convex part, and the fourth fastening part is a concave part, with the convex direction of the second fastening part and the convex direction of the third fastening part facing outward.

[0013] Furthermore, the connecting rod is arranged along the axial direction of the shift control component, and the connecting arm is a bent arm arranged along the circumference of the shift control component.

[0014] Furthermore, the cross-sectional shape of the connecting arm is the same as the cross-sectional shape of the control part of the shift control component.

[0015] Furthermore, it also includes a positioning structure, which includes a first positioning part and a second positioning part respectively disposed on the structural reinforcement and the shift control part, and the first positioning part and the second positioning part are fastened together.

[0016] This application also provides an internal gear hub, including the aforementioned shifting mechanism.

[0017] As can be seen from the above, this shifting mechanism, by setting up a structural reinforcement component that is fastened and connected to the shifting control component, allows the force exerted on the shifting control component to be transmitted to the structural reinforcement component, thereby distributing the force on the shifting control component and reducing deformation. The smaller the deformation, the more precise the shifting.

[0018] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0019] Figure 1 This is a 3D view of the shift mechanism and spindle.

[0020] Figure 2 This is a 3D view of the mandrel.

[0021] Figure 3 A 3D view of the gear shift control components and structural reinforcement components after assembly.

[0022] Figure 4 This is a rear view of the gear shift control unit and structural reinforcement components after assembly.

[0023] Figure 5 This is a 3D view of the gear shift control unit.

[0024] Figure 6 This is a three-dimensional view of the structural reinforcement component.

[0025] Figure 7 for Figure 4 Cross-sectional view along line AA.

[0026] Figure 8 This is one of the assembly processes for structural reinforcement components.

[0027] Figure 9 This is the second part of the assembly process for structural reinforcement components.

[0028] Figure 10 This is a schematic diagram of the shift pawl.

[0029] Figure 11 This is a schematic diagram of the linkage between the shift pawl and the sun gear.

[0030] Label Explanation:

[0031] 1- Gear shifting mechanism,

[0032] 11-Shift control component, 111-Connecting part, 112-Control part, 112A-First control surface, 112B-Second control surface, 113-Opening slot,

[0033] 12-Structural reinforcement, 121-Connecting arm, 122-Connecting rod,

[0034] 13-First fastening structure, 131-First fastening part, 132-Second fastening part,

[0035] 14-Second fastening structure, 141-Third fastening part, 142-Fourth fastening part,

[0036] 15-Positioning structure, 151-First positioning part, 152-Second positioning part,

[0037] 16-Shift pawl seat, 161-Pawl groove,

[0038] 17-Shift pawl, 171-Shaft, 172-Controlled part, 173-Locking part, 174-Snap ring action part

[0039] 2-Mandrel,

[0040] 3-Transmission mechanism, 31-Sun gear, 311-Locking groove. Detailed Implementation

[0041] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0042] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] This application provides a gear shifting mechanism 1. Figure 1 This is a perspective view of the shift mechanism 1 and the spindle 2. The shift mechanism 1 includes a shift control component 11, a shift pawl 17, and a shift pawl seat 16. The shift pawl 17 is mounted on the shift pawl seat 16. The shift control component 11 has an opening slot 113. The shift control component 11 is driven to rotate by a drive mechanism, which controls the shift pawl 17 to retract and open in a regular manner. The drive mechanism can be any device that can rotate the shift control component 11, such as a motor.

[0046] Figure 2 This is a perspective view of the mandrel 2. The shift pawl seat 16 and the mandrel 2 can be integral (one-piece molding) or separate. A separate shift pawl seat 16 is easier to process and reduces costs, while an integral shift pawl seat 16 has higher strength and precision. In this embodiment, the shift pawl seat 16 is directly machined on the mandrel 2. The shift pawl seat 16 is arranged along the axial direction of the mandrel 2. The shift pawl seat 16 is provided with a long strip-shaped shift pawl groove 161. Multiple shift pawls 17 are installed in the shift pawl groove 161. The shift pawls 17 have two states: retracted and extended.

[0047] The shift pawl seat 16 is also provided with multiple snap ring slots (not shown), and snap rings (not shown) are installed in the snap ring slots. The snap rings are installed on the outside of the snap ring action part 174 of the shift pawl 17. When assembled, the snap rings are kept in a contracted state and have a tendency to open outwards. They can apply tension to the shift pawl 17, keeping the shift pawl 17 open outwards. The shift pawl 17 will only retract inwards when it is subjected to a force in a specific direction.

[0048] Figure 3 A perspective view of the gear shift control component 11 and the structural reinforcement component 12 after assembly. Figure 4 Rear view of the gear shift control component 11 and structural reinforcement component 12 after assembly. Figure 5 This is a perspective view of the shift control component 11. In this embodiment, to achieve control of multiple gears and facilitate assembly, the shift control component 11 is provided with three control units 112, such as... Figure 1 As shown, a shift pawl 17 is installed in the space between two adjacent control units 112, and each control unit 112 controls one shift pawl 17.

[0049] exist Figure 4 In the middle, the shift control component 11 has a connecting part 111 at its leftmost end, which is used to assemble with the drive mechanism. After assembly, the drive mechanism outputs torque to the connecting part 111, causing the shift control component 11 to rotate.

[0050] The control unit 112 has a curved arm structure, and its inner wall is provided with an opening groove 113. The opening groove 113 is used to drive the shift pawl 17 to open and retract.

[0051] The control unit 112 has a first control surface 112A formed on the opening slot 113, which controls the shift pawl 17 to open. The control unit 112 is provided with a second control surface 112B, which is an arc surface, and controls the shift pawl 17 to retract. Because of the opening slot 113, when the shift control member 11 rotates, the opening slot 113 slides to the position of the controlled part 172 of the shift pawl 17, and the controlled part 172 of the shift pawl 17 has space to move. The shift pawl 17 then opens outward under the action of the retaining spring. When the second control surface 112B slides to the position of the shift pawl 17, it presses down the controlled part 172 of the shift pawl 17, thereby realizing the function of opening and retracting the shift pawl 17.

[0052] The structure of the shift pawl 17 is as follows Figure 10 As shown, the shift pawl 17 is provided with a locking part 173, a controlled part 172, a rotating shaft part 171, and a snap ring actuation part 174. The rotating shaft part 171 is located at the bottom of the locking part 173 and is semi-cylindrical. The shift pawl grooves 161 are all adapted to the shape of the rotating shaft part 171. The rotating shaft part 171 is hinged in the shift pawl grooves 161, allowing the shift pawl 17 to rotate around the axis of the rotating shaft part 171. The locking part 173 of the shift pawl 17 is used to fix or move the sun gear 31 in the transmission mechanism 3. The shift mechanism 1 is the same as that of CN222315899U and will not be described again.

[0053] Figure 11 This is a schematic diagram of the linkage between the shift pawl 17 and the sun gear 31. When the shift pawl 17 is open, its locking part 173 abuts against the locking groove 311 on the inner circumferential surface of the sun gear 31, fixing the sun gear 31. When the shift pawl 17 is retracted, its locking part 173 no longer abuts against the locking groove 311 of the sun gear 31, allowing the sun gear 31 to move. One shift pawl 17 controls one sun gear 31. By controlling the shift control component 11 to rotate to different angles, different shift pawls 17 are opened or retracted, thereby switching to different gears.

[0054] During the retraction process of the shift pawl 17, the control unit 112 needs to withstand a large force exerted by the shift pawl 17, and the control unit 112 is prone to deformation. Therefore, a structural reinforcement member 12 that is fastened and connected to the shift control member 11 is provided to reduce the deformation.

[0055] Figure 6 This is a perspective view of the structural reinforcement 12. Figure 7 for Figure 6 Cross-sectional view along line AA. Figure 8 This is one of the assembly processes for structural reinforcement component 12. Figure 9This is the second part of the assembly process for the structural reinforcement 12. The shift control component 11 and the structural reinforcement 12 are connected by a first fastening structure 13 and a second fastening structure 14, which are respectively located at both ends of the shift control component 11 and the structural reinforcement 12. The first fastening structure 13 and the second fastening structure 14 are used to quickly assemble the structural reinforcement 12 onto the shift control component 11 to form a whole. Moreover, the first fastening structure 13 and the second fastening structure 14 fit tightly, so that when the shift control component 11 is subjected to force, it can be transmitted to the structural reinforcement 12 through the first fastening structure 13 and the second fastening structure 14. The structural reinforcement 12 distributes the force on the shift control component 11, thereby reducing deformation. The smaller the deformation, the more precise the shifting.

[0056] The first fastening structure 13 and the second fastening structure 14 can be any type of structure capable of mutual fastening, such as L-shaped, U-shaped, hook-shaped, etc. In this embodiment, the first fastening structure 13 includes a first fastening portion 131 and a second fastening portion 132 respectively disposed on the structural reinforcement member 12 and the shift control member 11, and the cross-sectional shapes of the first fastening portion 131 and the second fastening portion 132 are complementary; the second fastening structure 14 includes a third fastening portion 141 and a fourth fastening portion 142 respectively disposed on the structural reinforcement member 12 and the shift control member 11, and the cross-sectional shapes of the third fastening portion 141 and the fourth fastening portion 142 are complementary.

[0057] The structural reinforcement 12 includes at least one connecting arm 121 and a connecting rod 122. The connecting rod 122 is connected to the connecting arm 121. A first fastening part 131 is disposed at the end of the connecting arm 121, and a second fastening part 132 is disposed at the end of the connecting rod 122. In this embodiment, two connecting arms 121 are provided, and the two connecting arms 121 are connected as a whole by connecting rods 122. The connecting rod 122 is arranged along the axial direction of the shift control member 11, and the connecting arm 121 is a semi-circular curved arm arranged along the circumference of the shift control member 11. The cross-sectional shape of the connecting arm 121 is the same as the cross-sectional shape of the control part 112 of the shift control member 11.

[0058] In other embodiments, the structural reinforcement 12 may further include at least one connecting arm 121 and a connecting rod 122, with the connecting rod 122 connected to the connecting arm 121. A second fastening portion 132 is disposed at the end of the connecting arm 121, and a first fastening portion 131 is disposed at the end of the connecting rod 122. This embodiment is only a simple modification compared to the previous embodiment, achieving the same function and effect.

[0059] The first engaging part 131 is concave, the second engaging part 132 is convex, the third engaging part 141 is convex, and the fourth engaging part 142 is concave. The convex directions of the second engaging part 132 and the third engaging part 141 face outwards. This design aims to facilitate the assembly of the structural reinforcement 12, i.e., according to… Figure 9 The arrow direction is used to press the structural reinforcement 12; on the other hand, it can prevent the structural reinforcement 12 from coming out.

[0060] To ensure a more precise positional relationship after the structural reinforcement 12 is assembled into the shift control component 11 and to prevent misalignment, a positioning structure 15 is provided. The positioning structure 15 includes a first positioning portion 151 and a second positioning portion 152 respectively disposed on the structural reinforcement 12 and the shift control component 11. In this embodiment, the first positioning portion 151 is a protrusion, and the second positioning portion 152 is a recess; however, they can be interchanged. The first positioning portion 151 is located at the middle of the end of the connecting arm 121, and the second positioning portion 152 is located at the middle of the end of the control portion 112. After the structural reinforcement 12 is assembled into the shift control component 11, the first positioning portion 151 and the second positioning portion 152 can be engaged and connected, thereby achieving the positioning of the structural reinforcement 12.

[0061] This application also provides an internal gear hub, which is equipped with the aforementioned shift mechanism 1. Except for the shift mechanism 1, the other mechanisms are the same as those in CN222315899U, and will not be described in detail here.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A shifting mechanism, comprising a shifting control component (11), a shifting pawl (17), and a shifting pawl seat (16), wherein the shifting pawl seat (16) is provided with a shifting pawl groove (161), the shifting pawl seat (16) is disposed on a spindle (2), the shifting pawl (17) is installed in the shifting pawl groove (161), the shifting pawl (17) has two states: outward opening and inward retraction, the shifting control component (11) is provided with an opening groove (113), the opening groove (113) is disposed in a control unit (112), the opening groove (113) is used to control the shifting pawl (17) to open or retract, so that the sun gear (31) of the transmission mechanism (3) is fixed or movable, characterized in that, It also includes a structural reinforcement (12) that is engaged and connected with the shift control (11).

2. The shifting mechanism according to claim 1, characterized in that, The shift control component (11) and the structural reinforcement component (12) are connected by a first fastening structure (13) and a second fastening structure (14), with the first fastening structure (13) and the second fastening structure (14) respectively disposed at both ends of the shift control component (11) and the structural reinforcement component (12).

3. The shifting mechanism according to claim 2, characterized in that, The first fastening structure (13) includes a first fastening part (131) and a second fastening part (132) respectively disposed on the structural reinforcement (12) and the shift control (11), and the cross-sectional shapes of the first fastening part (131) and the second fastening part (132) are complementary; The second fastening structure (14) includes a third fastening part (141) and a fourth fastening part (142) respectively disposed on the structural reinforcement (12) and the shift control (11), wherein the cross-sectional shapes of the third fastening part (141) and the fourth fastening part (142) are complementary.

4. The shifting mechanism according to claim 3, characterized in that, The structural reinforcement (12) includes at least one connecting arm (121) and a connecting rod (122), the connecting rod (122) being connected to the connecting arm (121), the first fastening part (131) being disposed at the end of the connecting arm (121), and the second fastening part (132) being disposed at the end of the connecting rod (122).

5. The shifting mechanism according to claim 3, characterized in that, The structural reinforcement (12) includes at least one connecting arm (121) and a connecting rod (122), the connecting rod (122) being connected to the connecting arm (121), the second fastening part (132) being disposed at the end of the connecting arm (121), and the first fastening part (131) being disposed at the end of the connecting rod (122).

6. The shifting mechanism according to claim 3, characterized in that, The first fastening part (131) is a concave part, the second fastening part (132) is a convex part, the third fastening part (141) is a convex part, and the fourth fastening part (142) is a concave part. The convex direction of the second fastening part (132) and the convex direction of the third fastening part (141) are outward.

7. The shifting mechanism according to claim 4, characterized in that, The connecting rod (122) is arranged along the axial direction of the shift control member (11), and the connecting arm (121) is a bent arm arranged along the circumference of the shift control member (11).

8. The shifting mechanism according to claim 4, characterized in that, The cross-sectional shape of the connecting arm (121) is the same as the cross-sectional shape of the control part (112) of the shift control member (11).

9. The shifting mechanism according to claim 1, characterized in that, It also includes a positioning structure (15), which includes a first positioning part (151) and a second positioning part (152) respectively disposed on the structural reinforcement (12) and the shift control part (11), and the first positioning part (151) and the second positioning part (152) are fastened together.

10. An internal speed-changing hub, characterized in that, The shifting mechanism includes any one of claims 1-9.

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