Miniature clutch device

Abstract

The miniature clutch device comprises a first coil, a second coil, a transmission part, a clutch connector, a rotatable self-locking device and a clutch sliding block with hard magnetism, the clutch sliding block is connected to the transmission part in a sliding mode and rotates synchronously, the second coil is sequentially electrified to form two magnetic fields in the opposite directions, and the two magnetic fields are applied to the self-locking device. At least the first coil is sequentially electrified to form two magnetic fields in opposite directions, and the two magnetic fields are respectively applied to the clutch sliding block, so that the clutch sliding block is switched between extension and retraction; therefore, the self-locking device can be switched between the separation position where the clutch sliding block is prevented from extending towards the clutch connector and the connection position where the clutch sliding block is allowed to be connected with the clutch connector, namely, the clutch function is achieved through electromagnetic interaction, the self-locking device can be used in a severe environment, and the working current is small.

Description

Technical Field

[0001] The present invention relates to the technical field of micro clutches, and in particular to a micro clutch device. Background Art

[0002] Currently, most micro clutches are driven by motors or electromagnets. The motor drive has poor waterproof effect, easily causes metal contact corrosion, and cannot be used in harsh environments. The working current of the electromagnet drive is large, which is not suitable for small current working scenarios.

[0003] In addition, the electromagnetic drive method cannot self-lock, so when encountering strong mechanical vibrations, it is easy to cause abnormal engagement of the micro-clutch, that is, the reliability and shock resistance of this type of micro-clutch are poor. Summary of the invention

[0004] Therefore, in order to solve the above problems, the present invention provides a miniature clutch device that can be used in harsh environments, has a small working current, and can also achieve a clutch function through electromagnetic interaction.

[0005] To achieve the above purpose, the technical solution provided by the present invention is as follows:

[0006] The present invention provides a micro clutch device, comprising a first coil, a second coil, a transmission member, a clutch slider, a clutch connector and a self-locking device; the self-locking device is rotatably arranged between the transmission member and the clutch connector; the clutch slider is slidably assembled on one end of the transmission member facing the clutch connector, and the clutch slider and the transmission member are synchronously rotated; the first coil is arranged at one end of the transmission member away from the clutch connector, and the second coil is arranged at one end of the clutch connector away from the transmission member; the clutch slider has hard magnetism, and the second coil The coils are energized in sequence to form two magnetic fields in opposite directions, which are applied to the self-locking device respectively, so that the self-locking device can rotate and switch between a disengaged position and an engaged position; at least the first coil is energized in sequence to form two magnetic fields in opposite directions, which are applied to the clutch slider respectively, so that the clutch slider can switch between extending and retracting toward the clutch connector; the first coil, the second coil and the self-locking device cooperate together to switch the self-locking device between a disengaged position that blocks the clutch slider from extending toward the clutch connector and an engaged position that allows the clutch slider to engage with the clutch connector.

[0007] Furthermore, the self-locking device includes a permanent magnet and a locking member for magnetic isolation, and the locking member is configured to be rotatable around its axial fixed point; the permanent magnet is fixedly mounted on one side of the locking member perpendicular to its axial direction to ensure that the magnetic field formed by the first coil being energized is isolated by the locking member, thereby ensuring that the permanent magnet is only restricted by the magnetic field formed by the second coil being energized; the second coil is energized in turn to form two magnetic fields in opposite directions which are applied to the permanent magnet respectively, so that the permanent magnet drives the locking member to rotate at a fixed point between the separation position and the engagement position, and when the self-locking device rotates to the engagement position, the clutch slider can movably pass through the locking member toward one end of the clutch connector and engage with the clutch connector.

[0008] Furthermore, a soft magnetic core is provided in the clutch connector; when the first coil and the second coil are powered off and the clutch slider is engaged with the clutch connector, the clutch slider and the soft magnetic core are magnetically attracted to each other, so that the clutch slider is adsorbed to the clutch connector to ensure stable engagement between the transmission member and the clutch connector; or when the first coil and the second coil are powered off and the clutch slider is retracted into the transmission member, the permanent magnetic member and the soft magnetic core are magnetically attracted to each other, so that the permanent magnetic member and the locking member are always maintained in a separated position to ensure that the clutch slider is blocked by the self-locking device and can no longer engage with the clutch connector, thereby forming a self-locking setting.

[0009] Furthermore, it also includes a shell; the locking component has a central part and a rotating shaft part respectively fixedly connected to the two ends of the central part in the axial direction; the central part has a central through hole for the clutch slider to pass through, and the permanent magnet is fixedly assembled on the outer peripheral wall of the central part; the two rotating shaft parts are rotatably assembled on the shell, and the rotation angle of the rotating shaft part is limited by the shell to ensure that the clutch slider can pass through the central through hole when the self-locking device rotates to the engagement position.

[0010] Furthermore, the first coil, the second coil, the transmission member, the clutch connector and the self-locking device are all arranged in the shell, and the transmission member and the clutch connector are rotatably arranged in the shell.

[0011] Furthermore, the locking component is a magnetic-isolating metal component, and the material of the magnetic-isolating metal component is copper, aluminum or an alloy thereof.

[0012] Furthermore, a clutch groove opening toward one side of the clutch connector is provided in the transmission member, the clutch slider can be slidably assembled in the clutch groove, and the outer peripheral surface of the clutch slider is restricted by the clutch groove to limit the free circumferential rotation of the clutch slider in the clutch groove, thereby ensuring that the clutch slider and the transmission member can rotate synchronously.

[0013] Furthermore, the cross-sectional shape of the clutch slider is a polygon, and the cross-sectional shape of the groove wall of the clutch sliding groove matches the cross-sectional shape of the clutch slider.

[0014] Furthermore, the clutch connector has an engagement groove at one end facing the transmission member, and the clutch slider is detachably inserted into the engagement groove at one end facing the clutch connector, so that the transmission member is engaged with the clutch connector through the clutch slider.

[0015] Furthermore, it also includes a main control board, and the input ends of the first coil and the second coil are electrically connected to the output ends of the main control board respectively to control the power on and off of the first coil and the second coil and their respective current directions.

[0016] The technical solution provided by the present invention has the following beneficial effects:

[0017] The first coil, the second coil, the clutch slider, the self-locking device and the clutch connector cooperate with each other to ensure that the clutch function is achieved through electromagnetic interaction. At the same time, the structure of the present invention is simple and can avoid the problem of metal contact corrosion so that it can be used in harsh environments. It also ensures that the working current of the present invention is small so that it is suitable for power transmission control of micro machinery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a schematic diagram of a micro-clutch device in an engaged position in an embodiment;

[0019] Figure 2 Shown is a schematic diagram of the micro-clutch device in the disengaged position in the embodiment;

[0020] Figure 3 Shown is a schematic diagram of a self-locking device in an embodiment;

[0021] Figure 4 Shown is a schematic diagram of a clutch slider in an embodiment. DETAILED DESCRIPTION

[0022] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0023] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0024] Reference Figures 1 to 4 As shown, this embodiment provides a micro clutch device for use in power transmission control of micro machinery.

[0025] like Figure 1 and Figure 2 As shown, the micro clutch device of this embodiment includes a first coil 1, a second coil 5, a transmission member 2, a clutch connector 4, a self-locking device 3 and a clutch slider 6 with hard magnetism.

[0026] The self-locking device 3 is rotatably arranged between the transmission member 2 and the clutch connector 4, that is, the transmission member 2 and the clutch connector 4 are arranged at a left and right interval from each other, and the self-locking device 3 is arranged with a gap with the transmission member 2 and the clutch connector 4 respectively.

[0027] The clutch slider 6 can be slidably assembled on one end of the transmission member 2 toward the clutch connector 4, and the clutch slider 6 and the transmission member 2 are arranged to rotate synchronously, so that the clutch slider 6 can slide left and right on the transmission member 2. At the same time, the transmission member 2 can also drive the clutch slider 6 to rotate synchronously, and then drive the clutch connector 4 to rotate when it is in the closed position to transmit power.

[0028] The first coil 1 is arranged at the left end of the transmission member 2 away from the clutch connector 4, and the second coil 5 is arranged at the right end of the clutch connector 4 away from the transmission member 2. Since the micro-clutch device does not have metal contacts, the corrosion problem of metal contacts can be avoided, and the structure is simple and reliable.

[0029] The second coil 5 is energized in sequence to form two magnetic fields in opposite directions, which are applied to the self-locking device 3 respectively, so that the self-locking device 3 can rotate and switch between the disengaged position and the engaged position, that is, when the second coil 5 is connected to a current in a first direction and forms a first magnetic field, the first magnetic field drives the self-locking device 3 to rotate counterclockwise to the engaged position, so as to allow the clutch slider 6 to engage with the clutch connector 4 to cooperate and complete the engagement; when the second coil 5 is connected to a current in a second direction opposite to the first direction and forms a second magnetic field, the second magnetic field drives the self-locking device 3 to rotate clockwise to the disengaged position, so as to prevent the clutch slider 6 from extending toward the clutch connector 4, thereby ensuring that the clutch connector 4 and the transmission member 2 cannot always engage, that is, maintain the disengaged position.

[0030] At least the first coil 1 is energized in sequence to form two magnetic fields in opposite directions, which are applied to the clutch slider 6 respectively, so that the clutch slider 6 switches between extending and retracting toward the clutch connector 4, that is, when the first coil 1 is connected to a current in a third direction and forms a third magnetic field, the third magnetic field drives the clutch slider 6 to extend or slide toward the clutch connector 4, and the first magnetic field drives the self-locking device 3 to rotate to the engagement position, so that the clutch slider 6 will not be restricted by the self-locking device 3 and directly passes through the self-locking device 3 until it engages with the clutch connector 4 to complete the closing action; when the first coil 1 is connected to a current in a fourth direction opposite to the third direction and forms a fourth magnetic field, the fourth magnetic field drives the clutch slider 6 to leave the clutch connector 4 and retract into the transmission member 2 to complete the opening action.

[0031] The first coil 1, the second coil 5 and the self-locking device 3 cooperate together to switch the self-locking device 3 between a disengaged position that blocks the clutch slider 6 from extending toward the clutch connector 4 and an engaged position that allows the clutch slider 6 to engage with the clutch connector 4, which correspond to the open position and the closed position of the micro-clutch device, respectively.

[0032] The micro clutch device of this embodiment also includes a housing 7 and a main control board. The input ends of the first coil 1 and the second coil 5 are electrically connected to the output ends of the main control board respectively to control the power on and off of the first coil 1 and the second coil 5 and their respective current directions.

[0033] The first coil 1, the second coil 5, the transmission member 2, the clutch connector 4 and the self-locking device 3 are all arranged in the housing 7. The transmission member 2 and the clutch connector 4 are respectively rotatably arranged in the housing 7, and when the transmission member 2 is connected to the power input end of the micro-machine, the clutch slider 6 is driven to slide toward the clutch connector 4 until the clutch connector 4 is engaged, so that the transmission member 2 drives the clutch slider 6 and the clutch connector 4 to rotate synchronously, thereby realizing power transmission and outputting it to the power output end of the micro-machine.

[0034] In this embodiment, Figure 3 As shown, the self-locking device 3 includes a permanent magnet 32 ​​and a locking member 31 for magnetic isolation. The locking member 31 is configured to be rotatable around its axial fixed point. The permanent magnet 32 ​​is fixedly mounted on one side of the locking member 31 perpendicular to its axial direction to ensure that the magnetic field formed by the first coil 1 being energized is isolated by the locking member 31, thereby ensuring that the permanent magnet 32 ​​is only limited by the magnetic field formed by the second coil 5 being energized, that is, the magnetic field formed by the first coil 1 being energized cannot act on the permanent magnet 32, and therefore the first coil 1 cannot affect the rotation of the self-locking device 3.

[0035] The second coil 5 is energized in turn to form two magnetic fields in opposite directions which are applied to the permanent magnet 32 ​​respectively, so that the permanent magnet 32 ​​drives the locking member 31 to rotate at a fixed point between the separation position and the engagement position, and when the self-locking device 3 rotates to the engagement position, the clutch slider 6 moves toward the right end of the clutch connector 4 and passes through the locking member 31 and engages with the clutch connector 4.

[0036] More specifically, the locking member 31 has a central portion 312 and a rotating shaft portion 311 respectively fixedly connected to both ends of the central portion 312 in the axial direction, the central portion 312 has a central through hole 313 for the clutch slider 6 to pass through, the permanent magnet 32 ​​is fixedly assembled on the outer peripheral wall of the central portion 312, the two rotating shaft portions 311 are rotatably assembled on the housing 7, and the rotation angle of the rotating shaft portion 311 is limited by the housing 7 to ensure that the clutch slider 6 can pass through the central through hole 313 when the self-locking device 3 rotates to the engagement position, and the locking member 31 is a magnetic isolation metal member, such as a material of copper, aluminum or an alloy thereof. Of course, in other embodiments, the locking member 31 can also adopt a semi-hole structure or other channel structure that allows the clutch slider 6 to pass freely to replace the central through hole 313, and is not limited thereto.

[0037] like Figure 2 As shown, a clutch slide groove 21 opening toward one side of the clutch connector 4 is provided in the transmission member 2, and the clutch slider 6 is slidably assembled in the clutch slide groove 21, and the left end of the clutch slider 6 is defined as the S pole, and the right end thereof is defined as the N pole.

[0038] like Figure 4 The cross-sectional shape of the clutch slider 6 is shown as a hexagon, and the cross-sectional shape of the groove wall of the clutch chute 21 matches the cross-sectional shape of the clutch slider 6, so that the outer peripheral surface of the clutch slider 6 is restricted by the clutch chute 21, that is, the clutch slider 6 is restricted from freely rotating in the clutch chute 21, thereby ensuring that the clutch slider 6 and the transmission member 2 can rotate synchronously. Of course, the cross-sectional shape of the clutch slider 6 can also be other polygons such as a triangle or a quadrilateral.

[0039] like Figure 2 As shown, the clutch connector 4 is provided with an engagement groove 41 at the left end facing the transmission member 2, and the clutch slider 6 is detachably inserted into the engagement groove 41 towards the right end of the clutch connector 4, and the cross-sectional shape of the groove wall of the engagement groove 41 also matches the cross-sectional shape of the clutch slider 6, so that the transmission member 2 is engaged with the clutch connector 4 through the clutch slider 6.

[0040] like Figure 1As shown, when the micro clutch device needs to be closed, the main control board is first used to connect the second coil 5 to the current in the first direction and form a first magnetic field. Because the magnetic pole of the permanent magnet 32 ​​facing the second coil 5 (i.e., the magnetic pole of the permanent magnet 32 ​​exposed to the locking member 31 and defined as the S pole) is the same as the magnetic pole of the first magnetic field facing the permanent magnet 32 ​​(i.e., the S pole) and repel each other, the first magnetic field drives the permanent magnet 32 ​​of the self-locking device 3 to rotate counterclockwise from the initial position to the engagement position and then be limited and no longer rotate. At this time, the center of the self-locking device 3 The central through hole 313 is aligned with the sliding track direction of the clutch slider 6, and then the main control board is passed to connect the current in the third direction to the first coil 1 and form a third magnetic field (i.e., the right magnetic pole of the first coil 1 is the S pole). The third magnetic field and the first magnetic field (i.e., the left magnetic pole of the second coil 5 is the S pole) jointly drive the clutch slider 6 to extend or slide toward the clutch connector 4 under the guidance of the clutch slide groove 21 of the transmission member 2, and then pass through the central through hole 313 of the self-locking device 3 until it engages with the clutch connector 4 to complete the closing position. Of course, in other embodiments, the clutch slider 6 can also be driven to extend toward the clutch connector 4 by only the third magnetic field formed by the power supply of the first coil 1 until it engages with the clutch connector 4.

[0041] like Figure 2 As shown, when the micro-clutch device needs to be split, the main control board is first used to connect the first coil 1 to the current in the fourth direction opposite to the third direction and form a fourth magnetic field (i.e., the right magnetic pole of the first coil 1 is the N pole). The right end of the clutch slider 6 is separated from the clutch connector 4 under the action of the fourth magnetic field, and passes back through the central through hole 313 of the self-locking device 3 again until it is retracted into the clutch slide groove 21 of the transmission member 2. Then, the main control board is used to connect the second coil 5 to the current in the second direction opposite to the first direction and form a second magnetic field (i.e., the left magnetic pole of the second coil 5 is the N pole). The permanent magnet 32 ​​of the self-locking device 3 rotates clockwise to the separation position or the initial position under the action of the second magnetic field. At this time, the plane where the central through hole 313 of the self-locking device 3 is located is parallel to the sliding track of the clutch slider 6, so as to ensure that the right end of the clutch slider 6 toward the clutch connector 4 is blocked by the hole wall 314 of the central through hole 313 and cannot move rightward toward the clutch connector 4.

[0042] The first coil 1, the second coil 5, the clutch slider 6, the self-locking device 3 and the clutch connector 4 cooperate with each other to ensure that the clutch function is achieved through electromagnetic interaction. At the same time, the structure of this embodiment is simple and can avoid the problem of metal contact corrosion so that it can be used in harsh environments. It also ensures that the working current of this embodiment is small, so that it is suitable for power transmission control of micro machinery.

[0043] In another preferred embodiment, a soft magnetic core is arranged in the clutch connector 4 .

[0044] When the clutch slider 6 is in the state of engaging with the clutch connector 4, the first coil 1 and the second coil 5 are de-energized synchronously through the main control board. Since the clutch slider 6 itself has hard magnetism, the clutch slider 6 and the soft magnetic core of the clutch connector 4 are magnetically attracted to each other, so that the clutch slider 6 is adsorbed to the clutch connector 4, thereby ensuring a stable engagement between the transmission member 2 and the clutch connector 4, that is, maintaining the engaged position.

[0045] When the clutch slider 6 has retracted into the transmission member 2, if the first coil 1 and the second coil 5 are powered off or have no current, and the entire micro-clutch device is in strong vibration, due to the magnetic attraction between the permanent magnet 32 ​​and the soft magnetic core of the clutch connector 4, the permanent magnet 32 ​​and the locking member 31 are always kept in the separated position to ensure that the clutch slider 6 is blocked by the self-locking device 3 and cannot move right and engage the clutch connector 4, that is, the micro-clutch device is always kept in the open position through the blocking effect of the self-locking device 3, thereby forming a self-locking function.

[0046] Therefore, when the micro-clutch encounters strong mechanical vibration, even if the first coil 1 and the second coil 5 are powered off, abnormal engagement will not occur due to the self-locking function, thereby ensuring the reliability and shock resistance of the micro-clutch.

[0047] Of course, when the micro-clutch switches from the engaged position to the disengaged position, the magnetic field formed by the power supply of the first coil 1 and the second coil 5 and the magnetic force between the clutch slider 6 need to overcome the magnetic force limitation between the clutch slider 6 and the soft magnetic core of the clutch connector 4 to ensure that the clutch slider 6 is pulled back to the left into the clutch slot 21 to stay away from the engagement groove 41.

[0048] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A micro clutch device, characterized in that: It includes a first coil, a second coil, a transmission member, a clutch slider, a clutch connector and a self-locking device; The self-locking device is rotatably arranged between the transmission member and the clutch connector; the clutch slider is slidably assembled on one end of the transmission member facing the clutch connector, and the clutch slider and the transmission member are synchronously rotated; The first coil is arranged at one end of the transmission member away from the clutch connector, and the second coil is arranged at one end of the clutch connector away from the transmission member; the clutch slider has hard magnetism, and the second coil is energized in sequence to form two magnetic fields in opposite directions, which are respectively applied to the self-locking device, so that the self-locking device rotates and switches between the disengaged position and the engaged position; At least the first coil is energized in sequence to form two magnetic fields in opposite directions, which are applied to the clutch slider respectively, so that the clutch slider switches between extending and retracting toward the clutch connector; The first coil, the second coil and the self-locking device cooperate together to switch the self-locking device between a separation position blocking the clutch slider from extending toward the clutch connector and an engagement position allowing the clutch slider to engage with the clutch connector.

2. The micro clutch device according to claim 1, characterized in that: The self-locking device includes a permanent magnet and a locking member for magnetic isolation, and the locking member is configured to be rotatable around its axial fixed point; the permanent magnet is fixedly mounted on one side of the locking member perpendicular to its axial direction to ensure that the magnetic field formed by the first coil being energized is isolated by the locking member, thereby ensuring that the permanent magnet is only restricted by the magnetic field formed by the second coil being energized; the second coil is energized in turn to form two magnetic fields in opposite directions which are applied to the permanent magnet respectively, so that the permanent magnet drives the locking member to rotate at a fixed point between a separation position and a coupling position, and when the self-locking device rotates to the coupling position, the clutch slider is movably passed through the locking member toward one end of the clutch connector and coupled to the clutch connector.

3. The micro clutch device according to claim 2, characterized in that: A soft magnetic core is arranged in the clutch connector; when the first coil and the second coil are powered off and the clutch slider has engaged with the clutch connector, the clutch slider and the soft magnetic core are magnetically attracted to each other, so that the clutch slider is adsorbed to the clutch connector to ensure stable engagement between the transmission member and the clutch connector; or when the first coil and the second coil are powered off and the clutch slider has retracted into the transmission member, the permanent magnetic member and the soft magnetic core are magnetically attracted to each other, so that the permanent magnetic member and the locking member are always kept in a separated position to ensure that the clutch slider is blocked by the self-locking device and can no longer engage with the clutch connector, thereby forming a self-locking setting.

4. The micro clutch device according to claim 2, characterized in that: It also includes a shell; the locking component has a central portion and a rotating shaft portion respectively fixedly connected to the two ends of the central portion in the axial direction; the central portion has a central through hole that cooperates with the clutch slider to pass through, and the permanent magnet is fixedly assembled on the outer peripheral wall of the central portion; the two rotating shaft portions are rotatably assembled on the shell, and the rotation angle of the rotating shaft portion is limited by the shell to ensure that the clutch slider can pass through the central through hole when the self-locking device rotates to the engagement position.

5. The micro clutch device according to claim 4, characterized in that: The first coil, the second coil, the transmission member, the clutch connector and the self-locking device are all arranged in the housing, and the transmission member and the clutch connector are rotatably arranged in the housing.

6. The micro clutch device according to claim 2, characterized in that: The locking component is a magnetic-isolating metal component, and the material of the magnetic-isolating metal component is copper, aluminum or an alloy thereof.

7. The micro clutch device according to any one of claims 1 to 6, characterized in that: The transmission member is provided with a clutch slide groove which is open toward one side of the clutch connector. The clutch slider can be slidably assembled in the clutch slide groove, and the outer peripheral surface of the clutch slider is restricted by the clutch slide groove to restrict the clutch slider from freely rotating in the clutch slide groove, thereby ensuring that the clutch slider and the transmission member can rotate synchronously.

8. The micro clutch device according to claim 7, characterized in that: The cross-sectional shape of the clutch slider is a polygon, and the cross-sectional shape of the groove wall of the clutch sliding groove matches the cross-sectional shape of the clutch slider.

9. The micro clutch device according to any one of claims 1 to 6, characterized in that: The clutch connector has an engagement groove at one end facing the transmission member, and the clutch slider is detachably inserted into the engagement groove at one end facing the clutch connector, so that the transmission member is engaged with the clutch connector through the clutch slider.

10. The micro clutch device according to any one of claims 1 to 6, characterized in that: It also includes a main control board, and the input ends of the first coil and the second coil are electrically connected to the output end of the main control board respectively to control the power on and off of the first coil and the second coil and their respective current directions.

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