Electronic rear transmission

Abstract

The utility model discloses an electronic rear transmission which comprises a driving unit, a movable unit and a connecting unit. The driving unit is connected to the bicycle; the movable unit is used for being connected with a chain guiding piece, and the connecting unit is used for connecting the movable unit and the driving unit; the driving unit comprises a shell, the inner wall of the shell is used for fixing a charging magnet, and the charging magnet is in magnetic attraction fit with an external charging wire; the motor is connected with the connecting unit through a gear box so as to output power; a control panel is arranged between the motor and the shell; the motor is electrically connected with the control panel; a power inductor is arranged on the control panel; the distance between the charging magnet and the power inductor is not smaller than the outer diameter of the charging magnet. According to the utility model, by controlling the distance between the motor magnet and the charging magnet and the size and the placement position of the charging magnet, the adverse effects of an external magnetic field on components such as a power inductor are greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of riding equipment, and specifically relates to an electronic rear derailleur. BACKGROUND

[0002] Magnetic charging is a technology that uses magnetic force to connect a charger and a device for charging. The main advantage of this technology is convenience and speed, and users do not need to accurately align the charging interface. They only need to bring the device close to the charger, and the magnetic force will automatically attract the two together to ensure good contact for charging.

[0003] The existing electronic rear derailleur can be charged in a magnetic charging mode. The motor of the electronic rear derailleur also has a magnet, which interacts with the magnet of the magnetic charging function, thereby forming a strong magnetic field in the product. This strong magnetic field can affect the power inductance of the peripheral components of the charging chip, such as interfering with the operation of the circuit, increasing the loss, and causing the charging current to be too small.

[0004] In summary, there is a need to design an electronic rear derailleur to solve the above technical problems. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide an electronic rear derailleur, which reduces the adverse effects of the strong magnetic field during magnetic charging by setting the relevant magnet structure.

[0006] To achieve the above utility model purposes, the utility model adopts the following technical solutions:

[0007] The utility model provides an electronic rear derailleur, which comprises a driving unit, a movable unit, and a connecting unit.

[0008] The driving unit is connected to a bicycle. The movable unit is used to connect with a chain guide. The connecting unit is used to connect the movable unit and the driving unit.

[0009] The driving unit comprises:

[0010] The inner wall of the shell is used to fix a charging magnet, which is magnetically attracted to an external charging wire.

[0011] The motor is connected to the connecting unit through a gear box to output power.

[0012] A control board is provided between the motor and the shell. The motor is electrically connected to the control board. The control board is provided with a power inductor.

[0013] The distance between the charging magnet and the power inductor is not less than the outer diameter of the charging magnet.

[0014] In some embodiments of the present application, the charging magnet is in a cylindrical structure; the height of the cylindrical structure is no more than 2.5 mm.

[0015] In some embodiments of the present application, the distance between the charging magnet and the power inductor is no less than twice the diameter of the charging magnet.

[0016] In some embodiments of the present application, a motor magnet is further arranged in the motor; the distance between the motor magnet and the power inductor is no less than 3 mm.

[0017] In some embodiments of the present application, the motor magnet and the charging magnet have the same magnetic pole on the opposite side.

[0018] In some embodiments of the present application, when the magnetic pole of the charging magnet adjacent to the control board is N pole, the magnetic pole of the motor magnet adjacent to the control board is also N pole.

[0019] In some embodiments of the present application, when the magnetic pole of the charging magnet adjacent to the control board is S pole, the magnetic pole of the motor magnet adjacent to the control board is also S pole.

[0020] In some embodiments of the present application, the shell comprises a body and a sealing part; the body is provided with an opening part; the sealing part is detachably mounted with the opening part.

[0021] In some embodiments of the present application, the sealing part is provided with a groove, the inner diameter of the groove matches the size of the charging magnet, and the groove is used for fixing the charging magnet.

[0022] In some embodiments of the present application, the sealing part is further provided with a through part, the through part is connected with the control board; when the sealing part is connected with the opening part, the through part is in contact with the control board, and the circuit in the control board is in communication;

[0023] When the sealing part is not connected with the opening part, the through part is not in contact with the control board, and the circuit in the control board is not in communication.

[0024] Compared with the prior art, the present application has the following advantages and positive effects:

[0025] The present application controls the distance between the motor magnet and the charging magnet, the size of the charging magnet and the placement position, so that the magnetic field lines formed by the motor magnet and the charging magnet pass through the power inductor as little as possible, thereby greatly reducing the adverse effects of the external magnetic field on the power inductor and other components.

[0026] Other features and advantages of the present application will become more apparent from the following detailed description when read in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0028] Figure 1 is a structural schematic diagram of an electronic rear derailleur according to the present application;

[0029] Figure 2 is a structural schematic diagram of an electronic rear derailleur according to the present application, omitting the sealing portion;

[0030] Figure 3 is a spatial distribution schematic diagram of a charging magnet, a power inductor and a motor according to the present application;

[0031] Figure 4 is a structural schematic diagram of a sealing portion according to the present application;

[0032] Figure 5 is a relationship schematic diagram of the diameter of a charging magnet and the magnetic flux of an electronic rear derailleur according to the present application;

[0033] Figure 6 is a relationship schematic diagram of the diameter of a charging magnet and the charging current of an electronic rear derailleur according to the present application;

[0034] Figure 7 is a relationship schematic diagram of the distance between a power inductor and a motor magnet and the charging current of an electronic rear derailleur according to the present application;

[0035] Figure 8 is a relationship schematic diagram of the height of a charging magnet and the charging current of an electronic rear derailleur according to the present application;

[0036] In the drawings,

[0037] 100, driving unit; 110, shell; 111, body; 112, opening portion; 113, sealing portion; 114, groove; 120, conducting portion; 130, control board; 131, power inductor; 140, motor; 150, charging magnet; 200, movable unit; 300, connecting unit; 400, chain guide. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0039] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0040] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0041] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or direct connection, or indirect connection through intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] In the present application, unless otherwise explicitly specified and limited, the first feature "above" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0043] The disclosure below provides many different implementations or examples to implement different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can refer to the same reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, which does not indicate the relationship between the various embodiments and / or settings discussed.

[0044] Referring to Figure 1 and Figure 2 The electronic rear derailleur includes a driving unit 100, a movable unit 200 and a connecting unit 300.

[0045] The driving unit 100 is connected to a bicycle; the movable unit 200 is used to connect with a chain guide 400, and the connecting unit 300 is used to connect the movable unit 200 and the driving unit 100.

[0046] The driving unit 100 includes:

[0047] The inner wall of the shell 110 is used to fix a charging magnet 150, and the charging magnet 150 is magnetically attracted to an external charging wire;

[0048] The motor 140 is connected to the connecting unit 300 through a gear box to output power;

[0049] The motor 140 and the shell 110 are provided with a control panel 130; the motor 140 and the control panel 130 are electrically connected; and the control panel 130 is provided with a power inductor 131.

[0050] The distance between the charging magnet 150 and the power inductor 131 is not less than the outer diameter of the charging magnet 150.

[0051] Specifically, the electronic rear derailleur is charged in a magnetic attraction charging mode. For magnetic attraction charging, it needs to be realized by two parts of magnetic material, one part is on the charger, and the other part is on the electronic rear derailleur that needs to be charged. When the two are close, the magnetic force will make them tightly adhere to each other. In addition, the contact point is usually a metal contact point. When these contact points are tightly contacted by magnetic force, an electric circuit can be formed, thereby starting charging.

[0052] The charging magnet 150 for cooperating with the charging wire is usually provided as two pieces, which correspond to attract each other in two NS poles with the charging wire.

[0053] In addition, the motor 140 in the electronic rear derailleur in this embodiment also has a magnet, i.e., a motor magnet, which forms a magnetic field that is larger than the magnetic field of the magnetic charging function, and the two interact to form a strong magnetic field in the electronic rear derailleur, which can affect the components such as the power inductor 131 and the like outside the control board 130. For example, the strong magnetic field can change the magnetization state of the magnetic core material inside the power inductor 131, causing magnetic saturation, and the inductance can be significantly reduced, which can affect the normal working performance of the circuit; if there is coupling between the external magnetic field and the power inductor 131, then changes in the external magnetic field can generate additional voltage or current in the power inductor 131 through mutual inductance, thereby interfering with the operation of the circuit; under the action of the strong magnetic field, the eddy current loss and hysteresis loss inside the magnetic core material can increase, causing the inductor to heat up and the efficiency to decrease, and in severe cases, the inductor can even be damaged; the strong magnetic field can also change the frequency response characteristics of the power inductor 131, so that the performance at certain frequencies does not match the design expectations.

[0054] Based on the above effects, the charging current of the electronic rear derailleur can be reduced, so as to be lower than the designed charging current value.

[0055] In this embodiment, the distance between the power inductor 131 and the charging magnet 150 is increased in space, so that the magnetic flux lines formed by the motor magnet and the charging magnet 150 pass through the power inductor 131 as little as possible.

[0056] Referring to Figure 3 , the distance between the charging magnet 150 and the power inductor 131 is D, and the outer diameter of the charging magnet 150 is d; it is found in the test process that the greater the distance D, the lower the magnetic flux of the power inductor 131 at the corresponding position.

[0057] The relationship between the magnetic flux and the distance D is shown in Figure 5 , where the abscissa is the distance D, and the ordinate is the magnetic flux. The ordinate 1 represents the magnetic flux on the surface of the magnet. As the distance D increases, the magnetic flux gradually decreases. When D≥d, the decrease in the magnetic flux is more obvious.

[0058] The relationship between the charging current and the distance D is shown in Figure 6 , where the abscissa is the distance D, and the ordinate is the charging current. The ordinate 1 represents the designed charging current value. As the distance D increases, the charging current increases.

[0059] In some embodiments of the present application, the charging magnet 150 is in a cylindrical structure; the height of the cylindrical structure is not greater than 2.5 mm.

[0060] Specifically, in this embodiment, the charging magnet 150 is in a cylindrical structure, with a diameter of 4 mm and a thickness of 4 mm. The charging magnet 150 mainly functions to be magnetically attracted to the magnet in the charging wire, thereby ensuring that the Pogo connector at the wire end is in contact with the Pogo connector at the product end, so as to achieve charging. After the two are magnetically attracted to each other, a certain magnetic attraction force needs to be ensured, so as to ensure that the charging is not affected by a certain degree of external change force.

[0061] The larger the size of the charging magnet 150 is, the stronger the magnetic induction lines formed by the charging magnet 150 and the motor magnet are, and the more likely the power inductor 131 is magnetically saturated, thereby more likely to affect the charging current. Therefore, reducing the charging magnet 150 can also solve this problem. Referring to Figure 7 When the diameter of the charging magnet 150 is 4 mm, the influence of the charging current under different thicknesses of the charging magnet 150 is shown in FIG. 4. The abscissa is the thickness value of the charging magnet 150, and the ordinate is the charging current value, in which 1 represents the designed charging current value. When the thickness of the magnet is reduced to 2.5 mm, the charging current is the designed charging current value.

[0062] In some embodiments of the present application, the distance between the charging magnet 150 and the power inductor 131 is not less than twice the diameter of the charging magnet 150. Referring to Figure 5 and Figure 6 As can be seen from FIG. 3, when D≥2d, the magnetic flux decays to 1 / 10 of the value at the surface of the magnet; similarly, when D≥2d, the charging current value is 1, i.e., the size of the designed current value. Through the above test data, it can be seen that when the distance between the power inductor 131 and the charging magnet 150 is not less than twice the diameter of the charging magnet 150, the designed charging current value will be consistent with the design requirement value, i.e., will not be affected by the magnetic field of the magnetically attracted charging magnet.

[0063] In some embodiments of the present application, the motor 140 is further provided with a motor magnet (not shown in the figure), and the distance between the motor magnet and the power inductor 131 is not less than 3 mm.

[0064] Specifically, the motor 140 adopts a hollow cup motor, and the motor magnet arranged in the hollow cup motor also has a strong magnetic field, which will affect the power inductor 131 used by the charging chip, thereby causing the charging current to be lower than the designed value. Referring to Figure 8 As shown in FIG. 5, the abscissa is the distance between the power inductor 131 and the hollow cup motor, and the ordinate is the charging current value, in which 1 represents the designed charging current value. When the power inductor 131 is 3 mm away from the hollow cup motor, the charging current is the designed charging current value.

[0065] In some embodiments of the present application, in order to let the magnetic flux lines formed between the charging magnet 150 and the motor magnet pass through the power inductor 131 as little as possible, the N and S poles of the charging magnet 150 and the motor magnet are not spatially corresponding. That is, the magnetic poles on the opposite side of the motor magnet and the charging magnet 150 are the same.

[0066] Specifically, when the magnetic pole on the side adjacent to the control board 130 of the charging magnet 150 is N pole, the magnetic pole on the side adjacent to the control board 130 of the motor magnet is also N pole. In other words, when the N pole of the charging magnet 150 is downward, the N pole of the motor magnet is upward.

[0067] In another embodiment, when the magnetic pole on the side adjacent to the control board 130 of the charging magnet 150 is S pole, the magnetic pole on the side adjacent to the control board 130 of the motor magnet is also S pole. In other words, when the S pole of the charging magnet 150 is downward, the S pole of the motor magnet is upward.

[0068] In some embodiments of the present application, continuing to refer to Figure 1 and Figure 2 As shown, the shell 110 includes a body 111 and a sealing portion 113; the body 111 is provided with an opening portion 112; the sealing portion 113 and the opening portion 112 are detachably installed.

[0069] In some embodiments of the present application, referring to Figure 4 As shown, the sealing portion 113 is provided with a groove 114, the inner diameter of the groove 114 matches the size of the charging magnet 150, and the groove 114 is used for fixing the charging magnet 150.

[0070] Specifically, in this embodiment, the charging magnet 150 is in cylindrical structure, so the cross-sectional structure of the groove 114 is also circular, and the charging magnet 150 can be fixedly bonded in the groove 114; in addition, the number of the grooves 114 is consistent with the number of the charging magnets 150.

[0071] In some embodiments of the present application, the sealing portion 113 is further provided with a through portion 120, the through portion 120 is connected with the control board 130; when the sealing portion 113 and the opening portion 112 are connected, the through portion 120 and the control board 130 are in contact, and the circuit in the control board 130 is in communication;

[0072] When the sealing portion 113 and the opening portion 112 are not connected, the through portion 120 and the control board 130 are not in contact, and the circuit in the control board 130 is not in communication.

[0073] Specifically, the conducting part 120 is made of metal material, and the number of the conducting part 120 is set according to the number of the contacts of the charging wire end; the sealing part 113 is provided with a through hole, and the conducting part 120 is inserted into the through hole; the through hole can be arranged at the middle position of the plurality of grooves 114.

[0074] In use, the body 111 forms a mounting space, and the control board 130 is located in the mounting space; in the state that the opening part 112 is not sealed by the sealing part 113, the conducting part 120 does not contact the control board 130, and at this time, the control board 130 is in a non-communication state; in the state that the sealing part 113 is installed at the opening part 112, the conducting part 120 contacts the control board 130, and at this time, the circuit of the control board 130 is in communication. Thus, the safety problem existing in the assembly process and the damage of the control board 130 can be avoided; and the control board 130 is in the circuit communication state only in the state that the electronic rear derailleur is assembled.

[0075] Compared with the prior art, the utility model has the advantages and positive effects that:

[0076] The utility model discloses a motor magnet and the distance between the charging magnet 150 and the size and placement position of the charging magnet 150 are controlled, so that the magnetic induction lines formed by the magnetic field of the motor magnet and the charging magnet 150 pass through the power inductance 131 as little as possible, thereby greatly reducing the adverse effects of the external magnetic field on the power inductance 131 and other components.

[0077] In the description of the above embodiment, the specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0078] As far as possible, various aspects and features described and shown in the specification can be applied independently, and these independent aspects can be the subject of a divisional application.

[0079] The above is only a specific implementation manner of the utility model, but the protection scope of the utility model is not limited to this, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model, therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. An electrically variable rear axle transmission characterized by, The utility model relates to an electronic rear derailleur, which comprises a driving unit, a movable unit and a connecting unit. The driving unit is connected to a bicycle. The movable unit is used to be connected with a chain guide, and the connecting unit is used to connect the movable unit with the driving unit. The driving unit comprises: An outer shell, the inner wall of which is used to fix a charging magnet, and the charging magnet is magnetically attracted to an external charging wire; An electric motor, which is connected to the connecting unit through a gear box to output power; A control board is arranged between the electric motor and the outer shell, and the electric motor is electrically connected to the control board, and a power inductor is arranged on the control board. The distance between the charging magnet and the power inductor is not less than the outer diameter of the charging magnet.

2. The electronic rear derailleur according to claim 1, wherein: The charging magnet is in a cylindrical structure, and the height of the cylindrical structure is not greater than 2.5 mm.

3. The electronic rear derailleur according to claim 2, wherein: The distance between the charging magnet and the power inductor is not less than twice the diameter of the charging magnet. An electric motor magnet is further arranged in the electric motor, and the distance between the electric motor magnet and the power inductor is not less than 3 mm.

4. The electrically variable transmission of claim 1 wherein, 5. The electronic rear derailleur according to claim 4, wherein: The opposite poles of the electric motor magnet and the charging magnet are the same.

6. The electronic rear derailleur according to claim 5, wherein: When the pole of the charging magnet adjacent to the control board is N pole, the pole of the electric motor magnet adjacent to the control board is also N pole. When the pole of the charging magnet adjacent to the control board is S pole, the pole of the electric motor magnet adjacent to the control board is also S pole.

7. The electrically variable rear drive transmission of claim 5, wherein, The outer shell comprises a body and a sealing part, the body is provided with an opening part, and the sealing part is detachably installed with the opening part.

8. The electrically variable transmission of claim 1 wherein, The sealing part is provided with a groove, the inner diameter of the groove matches the size of the charging magnet, and the groove is used to fix the charging magnet.

9. The electrically variable rear transmission of claim 8, wherein, The sealing part is further provided with a lead-through part, the lead-through part is connected to the control board, when the sealing part is connected to the opening part, the lead-through part is in contact with the control board, and the circuit in the control board is in communication; 10. The electrically variable rear transmission of claim 8, wherein, When the sealing part is not connected to the opening part, the lead-through part is not in contact with the control board, and the circuit in the control board is not in communication. ​

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