Joint mechanism and gear transmission structure

Abstract

The utility model discloses a joint mechanism and a gear transmission structure, the joint mechanism is used for connecting a first gear and a second gear, the second gear is provided with a plurality of grooves, and the joint mechanism is arranged between the first gear and the second gear and comprises a movable part; the movable part is movably arranged in one of the grooves; when the second gear rotates in the radial direction relative to the first gear, the movable part can move from one groove to the other groove. The joint mechanism is arranged between the first gear and the second gear, so that repeated separation and joint of the two gears caused by load fluctuation in the gear transmission operation process can be prevented.

Description

Technical Field

[0001] This application belongs to the field of gear transmission technology, and specifically relates to a coupling mechanism and a gear transmission structure. Background Technology

[0002] In traditional gear transmission structures, the mating structure of the two gears is made into a single structural component. When the drive motor rotates the first gear, it also drives the second gear to rotate. Changing the speed and angular position of the second gear requires altering the speed and angular position of the entire input shaft. As mentioned earlier, due to the large moment of inertia at the input end, changing the speed and angle requires a large torque, resulting in significant impact. Furthermore, during gear transmission, the first gear is easily affected by external load fluctuations while driving the second gear, causing repeated separation and engagement between the two, thus affecting the normal operation of the gear transmission. Summary of the Invention

[0003] The purpose of this application is to provide a coupling mechanism and gear transmission structure to prevent the first gear from being easily subjected to load fluctuations and repeatedly separating and engaging during the operation of driving the second gear.

[0004] To achieve the above objectives, this application provides a coupling mechanism for locking a first gear and a second gear, wherein the second gear has a plurality of grooves, and the coupling mechanism is disposed between the first gear and the second gear and includes:

[0005] A movable component is movably disposed within one of the grooves, and when the second gear rotates radially relative to the first gear, the movable component can move from one of the grooves to the other groove.

[0006] In some embodiments, the inner peripheral wall of the second gear is provided with a plurality of first gear teeth evenly spaced along the circumference, and a first tooth groove is formed between any two adjacent first gear teeth. The first gear includes a gear body and a mating gear ring coaxially disposed on the radial end face of the gear body. The outer peripheral wall of the mating gear ring is provided with a plurality of second gear teeth evenly spaced. The second gear teeth and the first tooth grooves are in a one-to-one clearance fit and form a spline groove.

[0007] In some embodiments, the angle between the extension lines of the two circumferentially opposite sidewalls of the spline groove is greater than half the angle between the extension lines of the two sidewalls of the first tooth groove.

[0008] In some embodiments, the engagement mechanism further includes multiple sets of evenly spaced elastic components. Each set of elastic components includes a first elastic element and a second elastic element. The first elastic element is elastically compressed between the first gear and the movable element. The two ends of the second elastic element abut against the inner wall of the first gear and the groove, respectively. The first elastic element and the second elastic element in each elastic component are respectively provided for one groove.

[0009] In some embodiments, the first gear has circular blind holes, the openings of which face one side of the second gear. The number of these circular blind holes is equal to the number of elastic elements in the elastic assembly, and they correspond one-to-one.

[0010] In some embodiments, the included angle between the center lines of the two circular blind holes corresponding to each set of elastic components, the included angle between the center lines of the two grooves, and the included angle between the extended lines of the two circumferentially opposite sidewalls of the spline groove are the same.

[0011] In some implementations, for a plurality of said elastic components, the distance between any two adjacent first elastic elements is equal, and the distance between any two adjacent second elastic elements is equal.

[0012] In some embodiments, the line connecting the centers of the plurality of circular blind holes lies on the same circumference, and the line connecting the centers of the plurality of grooves lies on the same circumference.

[0013] In some embodiments, the movable element is a spherical structure, the groove is a semi-circular structure, and the movable element can be partially embedded in the groove.

[0014] A second aspect of this application provides a gear transmission structure, including a first gear, a second gear, and a coupling mechanism as described above.

[0015] With the above technical solution, the second gear of the engagement mechanism is provided with multiple grooves. The engagement mechanism is located between the first gear and the second gear and includes a movable member, which is movably disposed in one of the grooves. During gear transmission, when the second gear rotates radially relative to the first gear, the movable member can move from one groove to another, so that a opposing force can always be applied to the first gear and the second gear, preventing them from repeatedly separating and engaging under load fluctuations.

[0016] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0018] Figure 1 This is a schematic diagram of the gear transmission structure of this application;

[0019] Figure 2 This is a front view schematic diagram of the gear transmission structure of this application;

[0020] Figure 3 This is a cross-sectional schematic diagram of the gear transmission structure of this application;

[0021] Figure 4 This is a schematic diagram of the second gear in the gear transmission structure of this application;

[0022] Figure 5 This is a schematic diagram of the first gear in the gear transmission structure of this application.

[0023] Explanation of reference numerals in the attached figures

[0024] Detailed Implementation

[0025] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0026] The engagement mechanism and gear transmission structure according to this application are described below with reference to the accompanying drawings, wherein the gear transmission structure can be applied to a shifting device.

[0027] like Figure 3As shown, this application provides a coupling mechanism for connecting a first gear 10 and a second gear 20. The second gear 20 has multiple grooves 34. The coupling mechanism is located between the first gear 10 and the second gear 20 and includes a movable member 31 and an elastic component. The movable member 31 is movably disposed within one of the grooves 34. When the second gear 20 rotates radially relative to the first gear 10, the movable member 31 can move from one groove 34 to another. Since the movable member 31 is movably disposed within the groove 34, when the second gear 20 rotates radially relative to the first gear 10 under external power, external fluctuations will drive the movable member 31 to jump and move to another adjacent groove 34. This ensures that a opposing force is always applied to the first gear and the second gear, preventing them from repeatedly separating and engaging under load fluctuations.

[0028] Furthermore, the engagement mechanism also includes an elastic component, which comprises a first elastic element 32 and a second elastic element 33. The first elastic element 32 is elastically compressed between the first gear 10 and the movable element 31, and the second elastic element 33 is connected between the first gear 10 and the inner wall of the groove 34. When the second gear 20 rotates radially relative to the first gear 10, the movable element 31 can move from one groove 34 to another, so that the first elastic element 32 and the second elastic element 33 alternately have elastic forces. In this embodiment, by providing an engagement mechanism between the first gear 10 and the second gear 20, the first elastic element 32 and the second elastic element 33 in the elastic component are both arranged perpendicular to the radial end faces of the first gear 10 and the second gear 20. One end of the first elastic element 32 abuts against the side of the first gear 10 facing the second gear 20, and the other end abuts against the movable element 31. Thus, the first elastic element 32 has elastic compression deformation, applying an elastic force to the first gear 10 and the second gear 20 on both sides. The second elastic element 33 is at its normal length, with both ends abutting against the side of the first gear 10 facing the second gear 20 and the inner wall of the groove 34, respectively, without generating an elastic force on the first gear 10 and the second gear 20. When the movable element 31 moves into another groove 34, the elastically deformed first elastic element 32 returns to its original length and no longer has an elastic force. The second elastic element 33 is compressed under the action of the movable element 31, thus exhibiting elastic deformation and generating an elastic force on the first gear 10 and the second gear 20. Therefore, whether before the second gear 20 rotates or when the second gear 20 rotates to the position where it engages with the first gear 10, the elastic components can apply an axial force to the first gear 10 and the second gear 20, preventing repeated separation and engagement due to load fluctuations during gear transmission operation and ensuring the normal operation of the gear transmission process.

[0029] like Figure 2As shown, the inner peripheral wall of the second gear 20 is provided with a plurality of first gear teeth 21 evenly spaced along the circumference, and a first tooth groove 22 is formed between any two adjacent first gear teeth 21. The first gear 10 includes a gear body 14 and a mating gear ring 11 coaxially disposed on the radial end face of the gear body 14. The outer peripheral wall of the mating gear ring 11 is provided with a plurality of second gear teeth 12 evenly spaced. The second gear teeth 12 and the first tooth groove 22 are in a one-to-one clearance fit and form a spline groove 13.

[0030] In this embodiment, the first gear tooth 21 on the inner circumferential wall of the second gear 20 and the second gear tooth 12 on the outer circumference of the mating gear ring 11 are in clearance fit, which facilitates the circumferential rotation of the second gear 20 on the first gear 10. Designing the second gear 20 and the first gear 10 as a separate structure ensures that when the rotational speed and angle of the second gear 20 need to be changed, only the rotational inertia of the second gear 20 needs to be considered, greatly reducing the torque required to change the rotational speed and angle of the second gear 20. Since there is a spline groove 13 between the outer circumferential wall of the second gear tooth 12 and the inner circumferential wall of the first gear tooth 21, after receiving a shift command, when the engaging sleeve drives the second gear 20 to rotate under the drive of the shift motor, the second gear 20 rotates circumferentially relative to the first gear 10 at a certain angle until the outer circumference of the second gear tooth 12 and the inner circumferential wall of the first tooth groove 22 make radial contact. Because the rotational inertia of the second gear 20 is very small, synchronization with the output speed and angle can be achieved with only a small torque, and then the shifting process continues under the action of axial force.

[0031] In some embodiments, the angle between the extension lines of the two circumferentially opposite sidewalls of the spline groove 13 is greater than half the angle between the extension lines of the two sidewalls of the first tooth groove 22.

[0032] The main function of the spline groove 13 is to ensure that the second gear 20 can rotate circumferentially relative to the first gear 10 at a certain angle until the two make radial contact. Therefore, this angle should be greater than or equal to half the angle of the first tooth groove 22 of a single second gear 20, i.e. N is the number of teeth on the first gear 21 of the second gear 20. If the angle between the tip of the engaging sleeve and the tooth groove of the second gear 20 is defined as 0, then the range of the angle difference between the engaging sleeve and the second gear 20 before engagement is ( When the engaging sleeve contacts the second gear 20, the second gear 20 may need to rotate. The angle is such that the tip of the engaging sleeve tooth aligns with the first tooth groove 22 of the second gear 20, therefore the required groove angle of the spline groove 13 is [value missing]. .

[0033] In some implementations, such as Figure 4As shown, the elastic components are arranged in multiple groups at even intervals, with the first elastic element 32 and the second elastic element 33 in each elastic component corresponding to a groove 34. The number of elastic components can be adjusted according to the required locking force and is not limited here. Since the first elastic element 32 and the second elastic element 33 each correspond to a groove 34, regardless of which groove 34 the moving part 31 moves into, there is always one elastic element with elastic deformation. Therefore, the elastic components can always apply an elastic force to the first gear 10 and the second gear 20, preventing the first gear 10 and the second gear 20 from repeatedly separating and engaging due to load fluctuations during operation.

[0034] like Figure 5 As shown, the first gear 10 has a circular blind hole 35, and the opening of the circular blind hole 35 is set to face the side of the second gear 20. The number of circular blind holes 35 is equal to the number of elastic elements in the elastic assembly and corresponds one-to-one.

[0035] In this embodiment, a circular blind hole 35 is formed on the gear body 14, with the opening of the circular blind hole 35 facing the side of the second gear 20. The presence of the circular blind hole 35 can prevent the end of the elastic element away from the second gear 20 from disengaging from the gear body 14. The circular blind hole 35 of this application extends axially along the gear body 14. Since the end of the elastic element away from the second gear 20 is located inside the circular blind hole 35, the elastic element is always located inside the circular blind hole 35 during the rotation of the second gear 20, preventing repeated separation of the second gear 20 and the first gear 10 during operation.

[0036] In some embodiments, the included angle between the center lines of the two circular blind holes 35 corresponding to each set of elastic components, the included angle between the center lines of the two grooves 34, and the included angle between the extended lines of the two circumferentially opposite sidewalls of the spline groove 13 are the same.

[0037] In this application, the spline groove 13 has a small groove angle. A set of elastic components corresponds to two circular blind holes 35 and two grooves 34. The angle between the center lines of the two circular blind holes 35 and the center lines of the two grooves 34 are equal to the groove angle of the spline groove 13. When the second gear 20 rotates the groove angle of the spline groove 13, it can easily drive the movable part 31 to jump from one groove 34 to another adjacent groove 34. Since the end of the elastic component away from the second gear 20 is always located in the circular blind hole 35, during the rotation of the second gear 20, the two ends of the first elastic component 32 and the second elastic component 33 correspond to the positions of the corresponding circular blind holes 35 and grooves 34, respectively. Through the movement of the movable part 31, the first elastic component 32 and the second elastic component 33 alternately have elastic driving force.

[0038] In some implementations, for a plurality of elastic components, the distance between any two adjacent first elastic elements 32 is equal, and the distance between any two adjacent second elastic elements 33 is equal.

[0039] Understandably, the presence of multiple elastic components can increase the locking force on the second gear 20 and the first gear 10. Multiple first elastic elements 32 and multiple second elastic elements 33 are all located on the same circumference. The distance between the first elastic element 32 and the second elastic element 33 in each set of elastic components is equal. In this way, when the elastic element abuts against the movable part 31, the deformation of the elastic element can be the same, so the force applied to the second gear 20 and the first gear 10 is also equal, ensuring that the locking force remains unchanged during the rotation process.

[0040] In some embodiments, the lines connecting the centers of the plurality of circular blind holes 35 are located on the same circumference, as are the lines connecting the centers of the plurality of grooves 34. The plurality of circular blind holes 35 and the plurality of grooves 34 correspond one-to-one, and the diameters of the circumferences containing the plurality of circular blind holes 35 and the circumferences containing the plurality of grooves 34 are the same. Thus, the lines connecting the centers of the circular blind holes 35 and the corresponding grooves 34 are perpendicular to the radial end faces of the first gear 10 and the second gear 20, thereby ensuring that the elastic element is in a straight line. When the second gear 20 rotates, although it causes the grooves 34 to deflect relative to the circular blind holes 35 at a certain angle, the angle range is very small and does not affect the elastic force of the elastic element.

[0041] In some embodiments, the movable member 31 has a spherical structure, and the groove 34 has a semi-circular structure, allowing the movable member 31 to be partially embedded in the groove 34. Preferably, the movable member 31 is a steel ball, with one half of the steel ball movably embedded in the groove 34 and the other half extending out of the groove 34, to facilitate the movement or jumping of the movable member 31 within the groove 34. When the second gear 20 rotates, under the action of an external force, the steel ball can jump from its current location in the groove 34 to an adjacent groove 34, thus placing the other elastic member in an elastically compressed state.

[0042] like Figure 1 As shown, a second aspect of this application provides a gear transmission structure, including a first gear 10, a second gear 20, and the engagement mechanism described above. In this gear transmission structure, when applied to a shifting device, the first gear 10 can be a shift gear, and the second gear 20 can be an engagement gear ring. The first gear 10 and the second gear 20 of this application are made into a separate structure, which can significantly reduce the rotational inertia at the input end, thereby greatly reducing shifting impact. Furthermore, since this gear transmission structure adopts all embodiments of the aforementioned engagement mechanism, it possesses all the beneficial effects brought about by the aforementioned engagement mechanism, which will not be elaborated upon here.

[0043] In the description of this application, it should be understood that 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 technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0046] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A coupling mechanism, characterized in that, For connecting the first gear (10) and the second gear (20), the second gear (20) is provided with a plurality of grooves (34), and the engagement mechanism is disposed between the first gear (10) and the second gear (20) and includes: The movable part (31) is movably disposed in one of the grooves (34) and can move from one of the grooves (34) to the other groove (34) when the second gear (20) rotates radially relative to the first gear (10).

2. The coupling mechanism according to claim 1, characterized in that, The inner circumferential wall of the second gear (20) is provided with a plurality of first gear teeth (21) evenly spaced along the circumference. A first tooth groove (22) is formed between any two adjacent first gear teeth (21). The first gear (10) includes a gear body (14) and a mating gear ring (11) coaxially disposed on the radial end face of the gear body (14). The outer circumferential wall of the mating gear ring (11) is provided with a plurality of second gear teeth (12) evenly spaced. The second gear teeth (12) and the first tooth groove (22) are in a one-to-one clearance fit and form a spline groove (13).

3. The coupling mechanism according to claim 2, characterized in that, The angle between the extension lines of the two sidewalls of the spline groove (13) arranged circumferentially opposite each other is greater than half the angle between the extension lines of the two sidewalls of the first tooth groove (22).

4. The coupling mechanism according to claim 2, characterized in that, The engagement mechanism further includes multiple sets of evenly spaced elastic components. Each set of elastic components includes a first elastic element (32) and a second elastic element (33). The first elastic element (32) is elastically compressed between the first gear (10) and the movable part (31). The two ends of the second elastic element (33) abut against the inner wall of the first gear (10) and the groove (34), respectively. The first elastic element (32) and the second elastic element (33) in each elastic component are respectively provided for one groove (34).

5. The coupling mechanism according to claim 4, characterized in that, The first gear (10) has a circular blind hole (35) with the opening of the circular blind hole (35) facing the side of the second gear (20). The number of the circular blind holes (35) is equal to the number of elastic elements in the elastic component and corresponds one-to-one.

6. The coupling mechanism according to claim 5, characterized in that, The included angle between the center lines of the two circular blind holes (35) corresponding to each set of elastic components, the included angle between the center lines of the two grooves (34), and the included angle between the extended lines of the two sidewalls of the spline groove (13) arranged opposite each other in the circumferential direction are the same.

7. The coupling mechanism according to claim 4, characterized in that, For the plurality of elastic components, the distance between any two adjacent first elastic elements (32) is equal, and the distance between any two adjacent second elastic elements (33) is equal.

8. The coupling mechanism according to claim 5, characterized in that, The line connecting the centers of the plurality of circular blind holes (35) is located on the same circumference, and the line connecting the centers of the plurality of grooves (34) is located on the same circumference.

9. The engagement mechanism according to any one of claims 1 to 8, characterized in that, The movable part (31) has a spherical structure, the groove (34) has a semi-circular structure, and the movable part (31) can be partially embedded in the groove (34).

10. A gear transmission structure, characterized in that, It includes a first gear (10), a second gear (20), and a coupling mechanism according to any one of claims 1 to 9.

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