CN215214619U - Motor gear box - Google Patents

Abstract

The utility model relates to an actuating mechanism technical field discloses a motor gear box. The motor gearbox includes a housing; the motor gearbox further comprises a motor arranged in the shell; the motor gearbox further comprises a gearbox output shaft arranged in the shell; and the motor gearbox further comprises a clutch mechanism; the clutch mechanism comprises a main gear and a planetary gear which are meshed with each other; when the main gear rotates, the planet gears move along the circumferential direction of the main gear; the main gear is in transmission connection with the motor, and when the motor drives the main gear to rotate, the planetary gear is selectively in transmission connection with the output shaft of the gear box. In this way, the utility model discloses can improve the smooth and easy degree of gear separation and reunion process.

Description

Motor gear box

Technical Field

The utility model relates to an actuating mechanism technical field especially relates to a motor gear box.

Background

At present, a motor gear box of an intelligent door lock in the market is generally designed with a gear clutch mechanism so as to realize establishment and cancellation of transmission connection between a motor and the door lock through the gear clutch mechanism. Especially when the lock needs to be opened and closed mechanically, the transmission connection between the motor and the door lock needs to be eliminated.

However, the existing gear clutch mechanism of the motor gear box is unreasonable in design and unstable in mechanism operation, so that the smoothness of gear clutch is poor, and the gear is easy to jam.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a motor gear box, which can improve the smoothness of the gear engaging and disengaging process.

In order to solve the technical problem, the utility model discloses a technical scheme be: a motor gearbox is provided. The motor gearbox includes a housing; the motor gearbox further comprises a motor arranged in the shell; the motor gearbox further comprises a gearbox output shaft arranged in the shell; and the motor gearbox further comprises a clutch mechanism; the clutch mechanism comprises a main gear and a planetary gear which are meshed with each other; when the main gear rotates, the planet gears move along the circumferential direction of the main gear; the main gear is in transmission connection with the motor, and when the motor drives the main gear to rotate, the planetary gear is selectively in transmission connection with the output shaft of the gear box.

In an embodiment of the present invention, the planetary gear includes first and second planetary gears spaced apart from each other in a circumferential direction of the main gear; when the main gear rotates along a first rotation direction, the first planetary gear is in transmission connection with the output shaft of the gear box; when the main gear rotates along a second rotation direction, the second planetary gear is in transmission connection with the output shaft of the gear box; wherein the first and second directions of rotation are opposite.

In an embodiment of the present invention, the clutch mechanism further includes a main gear shaft for disposing the main gear; the clutch mechanism also comprises a support piece which is rotatably connected with the main gear shaft; and the clutch mechanism also comprises a planet gear shaft for arranging the planet gear, the planet gear shaft is arranged on the support piece, and the planet gear can rotate relative to the planet gear shaft.

In an embodiment of the present invention, the clutch mechanism further includes a clutch elastic member sandwiched between the planetary gear and the support member, and the clutch elastic member is in a compressed state.

In an embodiment of the present invention, the supporting member includes a first supporting portion and a second supporting portion connected to each other, and a joint of the first supporting portion and the second supporting portion is rotatably connected to the main gear shaft; the planetary gears include first and second planetary gears spaced apart from each other in a circumferential direction of the main gear; wherein the first planetary gear is arranged on the first supporting part; the second planetary gear is provided on the second support portion.

In an embodiment of the present invention, the motor gear box includes a first transmission gear, and the first planetary gear and the second planetary gear are in transmission connection with the gear box output shaft through the first transmission gear; the extending direction of the first supporting part and the extending direction of the second supporting part form a preset angle, and the preset angle is smaller than 180 degrees; the space between the first support portion and the second support portion faces the first transmission gear.

In an embodiment of the present invention, the main gear includes a first gear portion and a second gear portion coaxially disposed; the first gear part and the second gear part can synchronously rotate; wherein, the first gear part is in transmission connection with the motor; the second gear portion is engaged with the planetary gear.

In an embodiment of the present invention, the motor gear box further includes a locked-rotor protection mechanism, and the locked-rotor protection mechanism includes a first protection gear in transmission connection with the motor; the locked-rotor protection mechanism further comprises a second protection gear which is coaxially arranged with the first protection gear, and the second protection gear is in transmission connection with the output shaft of the gear box; and the locked-rotor protection mechanism further comprises a protection elastic piece clamped between the first protection gear and the second protection gear, and the protection elastic piece is in a compression state.

In an embodiment of the present invention, the motor gear box further includes a second transmission gear sleeved on the output shaft of the gear box; wherein the second drive gear is fixed relative to the gearbox output shaft; the second transmission gear is used for being in transmission connection with the planetary gear.

In an embodiment of the present invention, the motor gear box further includes a worm in transmission connection with the output end of the motor; the motor gear box further comprises a third transmission gear which is in transmission connection with the worm and the main gear respectively.

The utility model has the advantages that: be different from prior art, the utility model provides a motor gear box. The clutch mechanism of the motor gear box comprises a main gear and a planetary gear. The main gear and the planetary gears are meshed with each other, and the planetary gears can move along the circumferential direction of the main gear along with the rotation of the main gear. Therefore, in the process that the motor drives the main gear to rotate, the planetary gear can be selectively in transmission connection with the output shaft of the gear box, namely the planetary gear can be in transmission connection with the output shaft of the gear box along with the movement of the planetary gear along the circumferential direction of the main gear, and the planetary gear can also be separated from the output shaft of the gear box along with the movement of the planetary gear along the circumferential direction of the main gear. It can be seen that the utility model discloses a planetary gear can accomplish the separation and reunion process smoothly with the gear box output shaft, can improve the smooth and easy degree of gear separation and reunion process.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. Moreover, the drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate it by those skilled in the art with reference to specific embodiments.

FIG. 1 is a schematic structural view of an embodiment of a motor gear box according to the present invention;

FIG. 2 is a schematic view of another perspective of the motor gearbox of FIG. 1;

fig. 3 is a schematic structural diagram of an embodiment of the clutch mechanism of the present invention;

fig. 4 is a schematic structural view of an embodiment of the clutch mechanism and the first transmission gear of the present invention in a meshing state;

fig. 5 is a schematic structural diagram of an embodiment of the locked rotor protection mechanism of the present invention;

fig. 6 is a schematic cross-sectional view of the locked protection mechanism of fig. 5 in the C-C direction.

Detailed Description

To make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention are combined to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

For the relatively poor technical problem of the smooth and easy degree of its gear clutch process of motor gear box among the solution prior art, an embodiment of the utility model provides a motor gear box. The motor gearbox includes a housing; the motor gearbox further comprises a motor arranged in the shell; the motor gearbox further comprises a gearbox output shaft arranged in the shell; and the motor gearbox further comprises a clutch mechanism; the clutch mechanism comprises a main gear and a planetary gear which are meshed with each other; when the main gear rotates, the planet gears move along the circumferential direction of the main gear; the main gear is in transmission connection with the motor, and when the motor drives the main gear to rotate, the planetary gear is selectively in transmission connection with the output shaft of the gear box. As described in detail below.

Referring to fig. 1 and 2, fig. 1 is a schematic structural view of an embodiment of a motor gear box according to the present invention, and fig. 2 is a schematic structural view of another view angle of the motor gear box shown in fig. 1.

In an embodiment, the motor gear box of the embodiment can be applied to products such as an intelligent door lock, and particularly can be applied to driving the intelligent door lock to be locked so as to complete the unlocking and locking operations. Of course, the motor gear box of the embodiment is not limited to be applied to the smart door lock, and is not limited herein.

The motor gearbox comprises a housing 10 and a motor 20 and a gearbox output shaft 30 provided to the housing 10. The gear box output shaft 30 is connected with the lock tongue in a transmission mode, and the lock tongue is driven to move to achieve unlocking and locking through rotation of the gear box output shaft 30 around the central shaft of the gear box output shaft. It will be appreciated that the gearbox output shaft 30 rotates in opposite directions during the unlocking and locking processes.

The motor 20 is drivingly connected to the gearbox output shaft 30 for rotating the gearbox output shaft 30. For the intelligent door lock, the motor 20 drives the unlocking and locking, so that the full automation of the intelligent door lock can be realized, and the intelligent door lock is convenient for a user to use. Of course, for intelligent door locks, it is common to provide the user with the ability to open and close the lock by himself, i.e., without being driven by motor 20. For example, the motor gearbox further comprises a knob 40, the knob 40 is clamped with the gearbox output shaft 30, that is, the knob 40 and the gearbox output shaft 30 are relatively fixed, and a user rotates the knob 40 to drive the gearbox output shaft 30 to rotate, so as to realize unlocking and locking.

Please continue with fig. 2. In one embodiment, when the user needs to unlock and close the lock using the aforementioned knob, the transmission connection between the motor 20 and the gearbox output shaft 30 needs to be removed, and the user can rotate the knob to rotate the gearbox output shaft 30. The reason for this is that: if a user uses the knob to unlock and lock, the transmission connection between the motor 20 and the output shaft 30 of the gearbox is still kept, because the meshing between the worm at the output end of the motor 20 and the helical gear has a self-locking effect, the helical gear is difficult to drive the worm to rotate reversely, and the resistance for driving the motor 20 to rotate reversely is large, so that the transmission connection between the motor 20 and the output shaft 30 of the gearbox is necessarily cancelled if the knob is needed to unlock and lock.

Referring to fig. 3, fig. 3 is a schematic structural diagram of an embodiment of the clutch mechanism of the present invention.

In view of this, the motor gearbox of the present embodiment further includes a clutch mechanism 50 for selectively removing the drive connection between the motor 20 and the gearbox output shaft 30. Specifically, the clutch mechanism 50 includes a main gear 51 and planetary gears 52. The main gear 51 and the planetary gears 52 are engaged with each other, and the planetary gears 52 are movable in the circumferential direction of the main gear 51 in accordance with the rotation of the main gear 51. The main gear 51 is in driving connection with the motor 20, wherein the main gear 51 is rotated by the motor 20, such that the planet gears 52 can be selectively in driving connection with the gearbox output shaft 30 to spin the gearbox output shaft 30.

That is, the planet gears 52 can be selectively drivingly connected to the gearbox output shaft 30 during rotation of the main gear 51 by the motor 20. The planetary gears 52 are held in meshing relationship with the main gear 51, and the planetary gears 52 are capable of rotating on their own axes with the rotation of the main gear 51 and also capable of moving in the circumferential direction of the main gear 51. The planetary gear 52 can be in transmission connection with the gearbox output shaft 30 along with the movement of the planetary gear along the circumferential direction of the main gear 51, and the motor 20 is in transmission connection with the gearbox output shaft 30 at the moment so as to realize unlocking and locking in a mode of being driven by the motor 20; the planet gears 52 may also be disengaged from the gearbox output shaft 30 as they move circumferentially along the main gear 51, with the motor 20 being disconnected from the gearbox output shaft 30 to allow the user to unlock and lock the lock by means of a knob drive.

Therefore, the utility model discloses a clutch mechanism 50 reasonable in design can provide comparatively smooth and easy separation and reunion process, means that planetary gear 52 can smoothly accomplish the separation and reunion process with gear box output shaft 30, can improve the smooth and easy degree of gear separation and reunion process.

Please continue to refer to fig. 2 and 3. In an embodiment, the clutch mechanism 50 further comprises a main gear shaft 53. The master gear shaft 53 is provided in the housing 10, and the master gear 51 is fitted around the master gear shaft 53. The main gear 51 is rotatably connected to the main gear shaft 53, and the main gear 51 is rotatable relative to the main gear shaft 53. The clutch mechanism 50 further includes a support 54 and a planetary gear shaft 55. The support 54 is rotatably connected to the main gear shaft 53, i.e. the other parts of the support 54 may rotate around the part of the support 54 connected to the main gear shaft 53. The planet shaft 55 is disposed on the support 54, and the planet gear 52 is rotatably sleeved on the planet shaft 55.

Since the main gear 51 and the planetary gears 52 are engaged with each other, when the main gear 51 is rotated by the motor 20, the main gear 51 applies a certain amount of torque to the planetary gears 52 (fig. 4 shows a case where the main gear 51 applies torque to the first planetary gears 521 and the second planetary gears 522, respectively, which will be described in detail later), and the planetary gears 52 are driven to move along the circumferential direction of the main gear 51, during which the main gear 51 and the planetary gears 52 are kept engaged. The above-mentioned design of rotatably connecting the support 54 and the main gear shaft 53 is a structural basis for the planet gears 52 to be able to move along the circumferential direction of the main gear 51, and the support 54 is able to swing along with the movement of the planet gears 52 along the circumferential direction of the main gear 51.

Referring to fig. 3 and 4, fig. 4 is a schematic structural view of an embodiment of the clutch mechanism and the first transmission gear of the present invention in a meshed state.

In one embodiment, it is contemplated that the gearbox output shaft 30 can be rotated in both forward and reverse directions to match the door lock unlocking and locking actions. If the clutch mechanism 50 only includes one planetary gear 52, when the motor 20 needs to be switched from the forward direction to drive the gearbox output shaft 30 to rotate reversely, the main gear 51 rotates reversely, so that the planetary gear 52 needs to move a large stroke along the circumferential direction of the main gear 51 to be in transmission connection with the gearbox output shaft 30 again.

In view of this, the planetary gears 52 of the present embodiment include first planetary gears 521 and second planetary gears 522, and the first planetary gears 521 and the second planetary gears 522 are spaced apart from each other in the circumferential direction of the main gear 51. The first planet gears 521 can be in driving connection with the gearbox output shaft 30 when the main gear 51 is rotated in a first rotational direction, and the second planet gears 522 can be in driving connection with the gearbox output shaft 30 when the main gear 51 is rotated in a second rotational direction. The first rotation direction and the second rotation direction are opposite in direction, that is, one of the first rotation direction and the second rotation direction may be a clockwise rotation direction, and the other may be a counterclockwise rotation direction.

As shown in fig. 2 and 4, when the motor 20 drives the main gear 51 to rotate in a first rotation direction (e.g., clockwise direction in fig. 4), the main gear 51 applies a moment to the first planetary gear 521 and the second planetary gear 522 respectively (the force of the moment is shown as F in fig. 4, and the distance between the main gear 51 and the first planetary gear 521 and the second planetary gear 522 is a moment arm), so that the first planetary gear 521 and the second planetary gear 522 both move along the circumferential direction of the main gear 51, and the first planetary gear 521 and the second planetary gear 522 move in the same direction, and finally the first planetary gear 521 is in transmission connection with the gearbox output shaft 30, and the second planetary gear 522 is not in transmission connection with the gearbox output shaft 30. Similarly, when the motor 20 drives the main gear 51 to rotate in the second rotation direction, the first planet gears 521 and the second planet gears 522 both move along the circumferential direction of the main gear 51, and the first planet gears 521 and the second planet gears 522 move in the same direction, the moving directions of the first planet gears 521 and the second planet gears 522 are opposite to the aforementioned case, and the rotation directions of the main gear 51, the first planet gears 521 and the second planet gears 522 are opposite to the aforementioned case, and finally the second planet gears 522 are in transmission connection with the gearbox output shaft 30, and the first planet gears 521 are not in transmission connection with the gearbox output shaft 30.

It can be seen that the first planetary gears 521 and the second planetary gears 522 of the present embodiment are designed to quickly reestablish the transmission connection between the motor 20 and the gearbox output shaft 30 when the motor 20 is running in the reverse direction, so as to improve the running efficiency of the motor gearbox, and avoid the problem that only one planetary gear 52 needs to move a large stroke along the circumferential direction of the main gear 51 to be in transmission connection with the gearbox output shaft 30 again when the motor 20 is running in the reverse direction due to the fact that only one planetary gear 52 is provided.

Further, the first planetary gear 521 and the second planetary gear 522 are respectively rotatably sleeved on one planetary gear shaft 55. Specifically, the planetary gear shafts 55 include first planetary gear shafts 551 and second planetary gear shafts 552, the first planetary gears 521 are provided to the support member 54 through the first planetary gear shafts 551, and the second planetary gears 522 are provided to the support member 54 through the second planetary gear shafts 552.

The support 54 includes a first support portion 541 and a second support portion 542. The ends of the first and second supporting portions 541 and 542 adjacent to each other are connected, and the connection of the first and second supporting portions 541 and 542 is rotatably connected to the main gear shaft 53. Specifically, the first support portion 541 supports the first planetary gears 521, and the second support portion 542 supports the second planetary gears 522.

The motor gearbox further comprises a first transfer gear 60, and the first and second planet gears 521, 522 are in driving connection with the gearbox output shaft 30 via the first transfer gear 60. Specifically, when the first planetary gears 521 are drivingly connected to the gearbox output shaft 30 via the first drive gear 60, the second planetary gears 522 are disconnected from the gearbox output shaft 30. When the second planetary gears 522 are drivingly connected to the gearbox output shaft 30 via the first drive gear 60, the first planetary gears 521 are disconnected from the gearbox output shaft 30.

The extending direction of the first supporting portion 541 (shown by a dotted line a in fig. 4) and the extending direction of the second supporting portion 542 (shown by a dotted line B in fig. 4) are set at a preset angle θ smaller than 180 °, and as shown in fig. 4, the supporting member 54 is configured like a boomerang. And, the space formed by the support 54 being recessed faces the first transmission gear 60.

In this way, the first supporting portion 541 and the second supporting portion 542 extend close to the first transmission gear 60, so that the distance between the first planetary gear 521 and the first transmission gear 60 and the distance between the second planetary gear 522 and the first transmission gear 60 are reduced, which is beneficial to reducing the stroke of the first planetary gear 521 moving to be in transmission connection with the first transmission gear 60 again, and reducing the stroke of the second planetary gear 522 moving to be in transmission connection with the first transmission gear 60 again, thereby improving the operation efficiency of the whole motor gearbox.

Please continue to refer to fig. 3. In one embodiment, the clutch mechanism 50 further includes a clutch elastic member 56. The clutch elastic member 56 is interposed between the planetary gear 52 and the support member 54, and the clutch elastic member 56 is in a compressed state. The elastic restoring force of the clutch elastic member 56 makes it abut against the planetary gears 52 and there is a certain frictional resistance between the clutch elastic member 56 and the planetary gears 52.

During the rotation of the planetary gear 52, the friction resistance provided by the clutch elastic member 56 provides a certain damping force for the rotation of the planetary gear 52, which is beneficial to ensure the stable operation of the planetary gear 52. Moreover, when the motor gearbox does not work, the transmission connection between the planetary gear 52 and the gearbox output shaft 30 is cancelled, the friction resistance provided by the clutch elastic piece 56 can prevent the planetary gear 52 from rotating to a certain degree, and further prevent the planetary gear 52 from mistakenly triggering the action of the transmission connection with the gearbox output shaft 30, and the stable operation of the motor gearbox is favorably ensured.

Alternatively, the clutch spring 56 may be a spring or other resilient member. The clutch elastic member 56 is sleeved on the planet gear shaft 55, and has one end abutting against the planet gear 52 and the other end abutting against the support member 54. It can be understood that one end of the planet pin 55 abuts against the side of the planet gear 52 facing away from the support 54, and the other end passes through the support 54 and is limited to the side of the support 54 facing away from the planet gear 52 by a snap spring, so as to ensure that the planet gear 52 and the support 54 are not separated under the elastic restoring force of the clutch elastic member 56.

Please continue to refer to fig. 2 and 3. In an embodiment, the main gear 51 includes a first gear portion 511 and a second gear portion 512, and the first gear portion 511 and the second gear portion 512 are coaxially disposed and can rotate synchronously, i.e. the main gear 51 is a duplicate gear. The first gear portion 511 of the main gear 51 is in transmission connection with the motor 20, and the second gear portion 512 is in mesh with the planet gears 52.

Alternatively, the tooth profiles of the first gear part 511, the second gear part 512, and the pinion gears 52 are all straight teeth.

It should be noted that, after the motor 20 drives the motor gear box to complete one unlocking or locking action, the motor gear box is reversely rotated to a certain extent, so that the transmission connection between the planetary gear 52 and the gear box output shaft 30 is cancelled, that is, the first planetary gear 521 and the second planetary gear 522 are not in transmission connection with the gear box output shaft 30, so as to allow a user to conveniently unlock and lock the motor 20 by using a mechanical method such as the above-mentioned knob at any time when the motor does not work.

Referring to fig. 2, 5 and 6, fig. 5 is a schematic structural diagram of an embodiment of the rotation blocking protection mechanism of the present invention, and fig. 6 is a schematic sectional structural diagram of the rotation blocking protection mechanism shown in fig. 5 in the C-C direction.

At present, the motor gear box of the intelligent door lock on the market does not design a corresponding protection mechanism for the motor 20, and the motor 20 is easy to cause the phenomenon of locked rotor. When the motor 20 is locked, the motor 20 may bear an excessive torque, which may damage the motor 20, shorten the service life of the motor 20, and further deteriorate the battery endurance of the intelligent door lock.

In view of this, the motor gear box of the present embodiment further includes a locked-rotor protection mechanism 70, and the locked-rotor protection mechanism 70 includes a first protection gear 71, a second protection gear 72, and a protection elastic member 73. The first protection gear 71 and the second protection gear 72 are coaxially arranged, the first protection gear 71 is in transmission connection with the motor 20, the second protection gear 72 is in transmission connection with the gearbox output shaft 30, the protection elastic piece 73 is clamped between the first protection gear 71 and the second protection gear 72, and the protection elastic piece 73 is in a compression state.

The protective elastic members 73 are in direct contact with the first protective gear 71 and the second protective gear 72, respectively, and the protective elastic members 73 in a compressed state apply a certain frictional force to the first protective gear 71 and the second protective gear 72, respectively. In this way, when the torque of the gearbox output shaft 30 is less than or equal to the torque threshold, the protective elastic member 73 provides a friction force to enable the first protective gear 71 and the second protective gear 72 to synchronously rotate, so as to ensure that the motor 20 drives the gearbox output shaft 30 to rotate; when the torque force of the output shaft 30 of the gearbox is greater than the torque force threshold value, the friction force provided by the protective elastic member 73 is not enough to keep the synchronous rotation between the first protective gear 71 and the second protective gear 72, and at the moment, the first protective gear 71 and the second protective gear 72 can slip and rotate relatively, and do not rotate synchronously any more, so that the motor 20 can be prevented from bearing excessive torque impact, the stability of the motor 20 can be ensured, and the service life of the motor 20 can be prolonged.

Further, the power consumption of the motor 20 is significantly increased when the motor is locked. Because the risk that motor 20 took place the locked rotor reduces, means to use the utility model discloses its battery duration of intelligent lock of motor gear box also can obtain the improvement of certain degree.

It should be noted that the torque threshold is defined as the maximum torque allowed to the gearbox output shaft 30 when the first guard gear 71 and the second guard gear 72 are rotating synchronously. When the torque force of the output shaft 30 of the gearbox is larger than the torque force threshold value, the first protective gear 71 and the second protective gear 72 can slip to rotate relatively and do not rotate synchronously.

In an embodiment, the locked-rotor protection mechanism 70 further includes a protection gear shaft assembly 74, and the first protection gear 71 and the second protection gear 72 are both sleeved on the protection gear shaft assembly 74. A fixing protrusion 741 is convexly disposed on the outer peripheral surface of the protection gear shaft assembly 74, the fixing protrusion 741 abuts against a surface of the first protection gear 71 away from the second protection gear 72 and/or the fixing protrusion 741 abuts against a surface of the second protection gear 72 away from the first protection gear 71, so that the first protection gear 71 and the second protection gear 72 clamp the protection elastic member 73.

Further, a surface of the first protection gear 71 facing away from the second protection gear 72 and/or a surface of the second protection gear 72 facing away from the first protection gear 71 are provided with a first installation groove 75, and the fixing protrusion 741 is embedded in the first installation groove 75. Therefore, the thickness of the whole locked-rotor protection mechanism 70 is reduced, the structure is more compact, and the motor gear box is miniaturized.

In an embodiment, the locked-rotor protection mechanism 70 further includes a protection gear shaft assembly 74 and a fixing washer 76, and the first protection gear 71 and the second protection gear 72 are both sleeved on the protection gear shaft assembly 74. The outer peripheral surface of the protection gear shaft assembly 74 is further provided with a fixing groove 742, the fixing gasket 76 is clamped in the fixing groove 742, the fixing gasket 76 abuts against the surface of the first protection gear 71, which is away from the second protection gear 72, and/or the fixing gasket 76 abuts against the surface of the second protection gear 72, which is away from the first protection gear 71, so that the first protection gear 71 and the second protection gear 72 clamp the protection elastic piece 73.

Further, a surface of the first protection gear 71 facing away from the second protection gear 72 and/or a surface of the second protection gear 72 facing away from the first protection gear 71 are provided with a second installation groove 77, and the fixing gasket 76 is embedded in the second installation groove 77. Therefore, the thickness of the whole locked-rotor protection mechanism 70 is reduced, the structure is more compact, and the motor gear box is miniaturized.

For example, as shown in fig. 5 and 6, to facilitate the assembly of the rotation blocking protection mechanism 70, one end of the protection gear shaft assembly 74 is provided with a fixing protrusion 741, and the other end is provided with a fixing groove 742. For example, the fixing protrusion 741 abuts against a surface of the first protection gear 71 facing away from the second protection gear 72, and the fixing washer 76 is engaged with the fixing groove 742 and abuts against a surface of the second protection gear 72 facing away from the first protection gear 71.

In this way, the first protection gear 71, the protection elastic member 73, and the second protection gear 72 may be sequentially mounted to the protection gear shaft assembly 74 from the end of the protection gear shaft assembly 74 where the fixing groove 742 is provided, and then the fixing washer 76 is snapped into the fixing groove 742 to fix the positions of the first protection gear 71, the protection elastic member 73, and the second protection gear 72 on the protection gear shaft assembly 74, and the first protection gear 71 and the second protection gear 72 may clamp the protection elastic member 73.

At this time, the first mounting groove 75 is formed on the surface of the first protection gear 71 facing away from the second protection gear 72, and the second mounting groove 77 is formed on the surface of the second protection gear 72 facing away from the first protection gear 71.

Alternatively, the fixing washer 76 may be a disc washer or the like. The protection elastic member 73 may be a spring, etc., and the protection elastic member 73 is sleeved on the protection gear shaft assembly 74, and one end of the protection elastic member is abutted against the first protection gear 71, and the other end of the protection elastic member is abutted against the second protection gear 72.

In an embodiment, the protection gear shaft assembly 74 includes a protection gear shaft 743 and a fixing shaft sleeve 744, the protection gear shaft 743 is disposed in the housing 10, the fixing shaft sleeve 744 is disposed on the protection gear shaft 743, and the first protection gear 71 and the second protection gear 72 are both disposed on the fixing shaft sleeve 744. Further, the protection gear shaft 743 and the fixing sleeve 744 are relatively fixed.

Further, a fixing protrusion 741 is protruded on an outer circumferential surface of the fixing boss 744 and/or a fixing groove 742 is formed on an outer circumferential surface of the fixing boss 744 as shown in fig. 6. In the above embodiment, in the case where the fixing protrusion 741 is disposed at one end of the protection gear shaft assembly 74 and the fixing groove 742 is disposed at the other end of the protection gear shaft assembly, the fixing protrusion 741 is disposed at one end of the fixing shaft sleeve 744 and the fixing groove 742 is disposed at the other end of the fixing shaft sleeve.

Please refer to fig. 2 to fig. 6. In one embodiment, the first protection gear 71 is in transmission connection with the motor 20 through the planetary gear 52 of the clutch mechanism 50 in the above embodiments. As in the previous embodiment, the motor gearbox further includes a first transmission gear 60, and the planetary gear 52 is in transmission connection with the first protection gear 71 through the first transmission gear 60.

The first transmission gear 60 includes a third gear portion 61 and a fourth gear portion 62, and as shown in fig. 2, the third gear portion 61 and the fourth gear portion 62 are coaxially disposed and can synchronously rotate, that is, the first transmission gear 60 is a double gear. The third gear portion 61 of the first transmission gear 60 is engaged with the planetary gears 52 of the clutch mechanism 50, and the fourth gear portion 62 is engaged with the first protective gear 71.

Alternatively, the tooth profiles of the third gear part 61 and the fourth gear part 62 are both straight teeth.

Please refer to fig. 2, 5 and 6 together. In an embodiment, the motor gearbox further includes a second transmission gear 80, the second transmission gear 80 is sleeved on the gearbox output shaft 30 and fixed relatively therebetween, the second transmission gear 80 is engaged with the second protection gear 72, and the second protection gear 72 can drive the second protection gear 72 to rotate, so as to drive the gearbox output shaft 30 to rotate. Fig. 2 shows that the second transmission gear 80 is provided with a non-circular irregular through hole 81, the gearbox output shaft 30 passes through the through hole 81, the shapes of the two are matched, the second transmission gear 80 and the gearbox output shaft 30 are clamped, and therefore the two are relatively fixed.

Please continue to refer to fig. 2 and 3. In an embodiment, the motor gearbox further comprises a worm 21 and a third transmission gear 90, the worm 21 is in transmission connection with the output end 22 of the motor 20, the worm 21 is in transmission connection with the main gear 51 through the third transmission gear 90, and the motor 20 drives the main gear 51 of the clutch mechanism 50 to rotate through the worm 21, so that the whole motor gearbox is driven to operate.

The third transmission gear 90 includes a fifth gear 91 and a sixth gear 92, as shown in fig. 2, the fifth gear 91 and the sixth gear 92 are coaxially disposed and can rotate synchronously, that is, the third transmission gear 90 is a duplicate gear. The fifth gear part 91 of the third transmission gear 90 has a tooth profile of helical teeth, and the fifth gear part 91 is engaged with the worm 21 to convert the rotation of the output side of the motor 20 into the rotation of the third transmission gear 90. The sixth gear part 92 of the third transmission gear 90 is meshed with the main gear 51, and specifically, with the first gear part 511 of the main gear 51.

Alternatively, the tooth profile of the sixth gear part 92 is straight teeth.

The working process of the motor gear box of the present invention is roughly explained below.

When the lock is unlocked or locked in a mode of being driven by the motor 20, the motor 20 drives the worm 21 to rotate, and the third transmission gear 90 rotates clockwise; then, the main gear 51 of the clutch mechanism 50 is driven to rotate counterclockwise, so that the first planetary gear 521 moves to be meshed with the first transmission gear 60 along the circumferential direction of the main gear 51, and the first transmission gear 60 is driven to rotate counterclockwise; then the first transmission gear 60 drives the first protection gear 71 and the second protection gear 72 to rotate clockwise; the second guard gear 72 then drives the second transmission gear 80 to rotate counterclockwise, which in turn drives the gearbox output shaft 30 to rotate, completing one of the unlocking and locking actions.

Of course, during the other action of unlocking or locking, the second planetary gear 522 is engaged with the first transmission gear 60, and the rotation direction of each gear is opposite to that of the above situation, which will not be described in detail.

Moreover, if the torque of the output shaft 30 of the gearbox is too large during the unlocking or locking process, the first protection gear 71 and the second protection gear 72 will slip and rotate relatively, and will not rotate synchronously any more, so that the motor 20 can be prevented from bearing too large torque impact, the stability of the motor 20 can be ensured, and the service life of the motor 20 can be prolonged.

Furthermore, in the present invention, unless otherwise expressly specified or limited, the terms "connected," "stacked," and the like are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. A motor gearbox, comprising:

a housing;

a motor disposed in the housing;

a gearbox output shaft disposed in the housing; and

a clutch mechanism; wherein

The clutch mechanism comprises a main gear and a planetary gear which are meshed with each other;

when the main gear rotates, the planet gears move along the circumferential direction of the main gear;

the main gear is in transmission connection with the motor, and when the motor drives the main gear to rotate, the planetary gear is selectively in transmission connection with the output shaft of the gear box.

2. The motor gearbox of claim 1,

the planetary gears include first and second planetary gears spaced apart from each other in a circumferential direction of the main gear; wherein,

when the main gear rotates along a first rotation direction, the first planetary gear is in transmission connection with the output shaft of the gear box;

when the main gear rotates along a second rotation direction, the second planetary gear is in transmission connection with the output shaft of the gear box; wherein,

the first rotation direction and the second rotation direction are opposite in direction.

3. The motor gearbox of claim 1, wherein the clutch mechanism further comprises:

a main gear shaft for disposing the main gear;

a support rotatably connected to the main gear shaft; and

the planet gear shaft is used for arranging the planet gear, the planet gear shaft is arranged on the support, and the planet gear can rotate relative to the planet gear shaft.

4. The motor gear box according to claim 3, wherein the clutch mechanism further comprises a clutch elastic member interposed between the planetary gear and the support member, and the clutch elastic member is in a compressed state.

5. The motor gearbox of claim 3,

the support member includes:

the first supporting part and the second supporting part are connected with each other, and the joint of the first supporting part and the second supporting part is rotatably connected with the main gear shaft;

the planetary gear includes:

first and second planetary gears spaced apart from each other in a circumferential direction of the main gear;

wherein,

the first planetary gear is arranged on the first supporting part;

the second planetary gear is provided on the second support portion.

6. The motor gearbox of claim 5,

the motor gear box includes:

the first planetary gear and the second planetary gear are in transmission connection with the output shaft of the gear box through the first transmission gear;

the extending direction of the first supporting part and the extending direction of the second supporting part form a preset angle, and the preset angle is smaller than 180 degrees;

the space between the first support portion and the second support portion faces the first transmission gear.

7. Motor gearbox according to any of the preceding claims 1 to 6,

the main gear includes:

a first gear part and a second gear part which are coaxially arranged;

the first gear part and the second gear part can synchronously rotate; wherein,

the first gear part is in transmission connection with the motor;

the second gear portion is engaged with the planetary gear.

8. The motor gearbox of any one of claims 1 to 6, further comprising a stall protection mechanism, the stall protection mechanism comprising:

the first protection gear is in transmission connection with the motor;

the second protective gear is coaxially arranged with the first protective gear and is in transmission connection with the output shaft of the gear box; and the number of the first and second groups,

the protection elastic piece is clamped between the first protection gear and the second protection gear and is in a compressed state.

9. A motor gearbox according to any one of claims 1 to 6, further comprising:

the second transmission gear is sleeved on the output shaft of the gear box; wherein,

the second drive gear is fixed relative to the gearbox output shaft;

the second transmission gear is used for being in transmission connection with the planetary gear.

10. A motor gearbox according to any one of claims 1 to 6, further comprising:

the worm is in transmission connection with the output end of the motor; and

and the third transmission gear is in transmission connection with the worm and the main gear respectively.

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