Hub gear motor capable of being braked and mowing robot

Abstract

The utility model provides a wheel hub speed reduction motor capable of braking and a mowing robot, the wheel hub speed reduction motor comprises a fixed shaft assembly, the fixed shaft assembly is provided with a stator assembly, a rotor shaft, a speed reduction mechanism, a wheel hub and a brake; the stator assembly is used for driving the rotor shaft to rotate, and the rotor shaft drives the hub to rotate through the speed reducing mechanism. And the brake is used for braking the rotor shaft when power is off and releasing the braking of the rotor shaft when power is on. According to the technical scheme, when a vehicle such as a mowing robot flames out, the hub gear motor is powered off, the brake is powered off at the moment, the brake brakes the rotor shaft, and therefore the hub can be prevented from rotating, and the mowing robot is prevented from sliding down.

Description

Technical Field

[0001] The utility model belongs to the technical field of reduction motors, and in particular relates to a brakeable hub reduction motor and a lawn mowing robot. Background Art

[0002] When the lawn mower robot is parked on a slope, if the wheel hub is not powered enough, the lawn mower robot is prone to slide down under the action of gravity. Utility Model Content

[0003] Therefore, the utility model provides a brakeable hub reduction motor and a lawn mower robot, which can solve the technical problem in the prior art that when the lawn mower robot stops on a slope, if the hub power supply is insufficient, the lawn mower robot is easy to slide down under the action of gravity.

[0004] In order to solve the above problems, the utility model provides a brakeable hub reduction motor, which includes a fixed shaft assembly, on which a stator assembly, a rotor shaft, a reduction mechanism, a wheel hub and a brake are provided; the stator assembly is used to drive the rotor shaft to rotate, and the rotor shaft drives the wheel hub to rotate through the reduction mechanism; wherein the brake is used to brake the rotor shaft when power is off, and to release the brake on the rotor shaft when power is on.

[0005] In some embodiments, the brake comprises an electromagnet, an elastic member and an armature; a friction member is circumferentially fixed on the rotor shaft;

[0006] When the brake is powered off, the electromagnet is powered off, and the elastic member drives the armature to abut against the friction member to brake the rotor shaft through the friction member; when the brake is powered on, the electromagnet is powered on, and the electromagnet drives the armature to separate from the friction member to release the brake on the rotor shaft.

[0007] In some embodiments, the brake further comprises an end cover, the end cover and the fixed shaft assembly are relatively fixed, and the friction member is arranged between the end cover and the armature;

[0008] The friction member can move along the axial direction of the rotor shaft; wherein, when the brake is powered off, the armature is driven by the elastic member to press the friction member against the end cover; when the brake is powered on, the friction member is separated from the end cover.

[0009] In some embodiments, when the brake is energized, the friction member is configured to separate from the end cover under the action of inertia force when rotating with the rotor shaft.

[0010] In some embodiments, the friction member is sleeved on the rotor shaft, a sleeve hole is provided on the friction member, the sleeve hole is a non-circular hole, the rotor shaft has an assembly portion that is consistent with the shape of the sleeve hole, the friction member is sleeved on the assembly portion of the rotor shaft through the sleeve hole, and the sleeve hole and the assembly portion are slidably matched in the axial direction of the rotor shaft.

[0011] In some embodiments, the sleeve hole is a square hole.

[0012] In some embodiments, the reduction mechanism includes a sun gear, planetary gears and an inner ring gear, and the planetary gears are meshed between the sun gear and the inner ring gear;

[0013] The rotor shaft is used to drive the sun gear to rotate, so that the sun gear drives the inner ring gear to rotate through the planetary gears; the inner ring gear is connected to the wheel hub to drive the wheel hub to rotate.

[0014] In some embodiments, the inner gear ring is integrally formed on the inner side of the wheel hub.

[0015] The utility model also provides a lawn mowing robot, which may include any one of the brakeable hub reduction motors described above.

[0016] The brakeable hub reduction motor and lawn mowing robot provided by the utility model have the following beneficial effects:

[0017] 1. When a vehicle, such as a lawn mower robot, is turned off, the wheel hub reduction motor is powered off, and the brake is also powered off. The brake brakes the rotor shaft, thereby preventing the wheel hub from rotating and preventing the lawn mower robot from sliding down.

[0018] 2. The electromagnet cooperates with the elastic part to drive the armature to abut against the friction part when the brake is powered off, and to drive the armature to separate from the friction part when the brake is powered on. When the armature and the friction part abut against each other, the friction resistance between the armature and the friction part brakes the rotor shaft through the friction part to prevent the rotor shaft from rotating. When the armature and the friction part are separated, the friction resistance between the armature and the friction part disappears, and the rotor shaft can rotate freely again.

[0019] 3. When the brake is powered off, the armature is driven by the elastic part to press the friction part against the end cover. At this time, one side of the friction part abuts against the armature, and the other side of the friction part abuts against the end cover. Friction resistance will be generated on both sides of the friction part, which can improve the braking effect of the friction part. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0021] Figure 1 It is a partial cross-sectional view of the brakeable wheel hub reduction motor of the utility model;

[0022] Figure 2 It is a schematic diagram of the structure of the brake;

[0023] Figure 3 is a cross-sectional view of the brake.

[0024] The accompanying drawings are marked as follows:

[0025] 1. Fixed shaft; 2. Wheel hub; 3. Planetary gear; 4. Inner ring gear; 5. Planetary gear carrier; 6. Sun gear; 7. Rotor shaft; 8. Brake; 9. Stator assembly; 71. Assembly part; 81. Armature; 82. Friction part; 83. End cover; 84. Electromagnet; 101. Through hole; 801. Sleeve hole. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0027] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0028] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0029] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0030] See also Figure 1-3 As shown, according to an embodiment of the utility model, a brakeable wheel hub reduction motor is provided, which includes a fixed shaft assembly, on which a stator assembly 9, a rotor shaft 7, a reduction mechanism, a wheel hub 2 and a brake 8 are arranged. The stator assembly 9 is used to drive the rotor shaft 7 to rotate, and the rotor shaft 7 drives the wheel hub 2 to rotate through the reduction mechanism. Among them, the brake 8 is used to brake the rotor shaft 7 when the power is off, and release the brake on the rotor shaft 7 when the power is on.

[0031] It should be noted here that the above-mentioned fixed shaft assembly can include a fixed shaft 1 and a fixing part that is relatively fixed to the fixed shaft 1, the fixing part includes a planetary gear carrier 5 and a motor fixing seat, etc., and the above-mentioned stator assembly 9, rotor shaft 7, reduction mechanism, wheel hub 2 and brake 8 are all arranged on the fixing part.

[0032] In the above example, when the vehicle, such as the lawn mower robot, is turned off, the hub reduction motor is powered off, and the brake 8 is also powered off. The brake 8 brakes the rotor shaft 7, thereby preventing the wheel hub 2 from rotating and preventing the lawn mower robot from sliding down.

[0033] In order to realize the function of the aforementioned brake 8, as Figure 2 and Figure 3As shown, the brake 8 may include an electromagnet 84, an elastic member and an armature 81. The elastic member may be a spring or a flexible plastic, etc. A friction member 82 is fixed circumferentially on the rotor shaft 7, and the rotor shaft 7 may drive the friction member 82 to rotate together. When the brake 8 is powered off, the electromagnet 84 is powered off, and the elastic member drives the armature 81 to abut against the friction member 82, so as to brake the rotor shaft 7 through the friction member 82. When the brake 8 is powered on, the electromagnet 84 is powered on, and the electromagnet 84 drives the armature 81 to separate from the friction member 82, so as to release the brake on the rotor shaft 7.

[0034] In the above example, the electromagnet 84 cooperates with the elastic member to drive the armature 81 to abut against the friction member 82 when the brake 8 is powered off, and to drive the armature 81 to separate from the friction member 82 when the brake 8 is powered on. When the armature 81 abuts against the friction member 82, the friction resistance between the armature 81 and the friction member 82 brakes the rotor shaft 7 through the friction member 82 to prevent the rotor shaft 7 from rotating. When the armature 81 and the friction member 82 separate, the friction resistance between the armature 81 and the friction member 82 disappears, and the rotor shaft 7 can rotate freely again.

[0035] In a specific application example, Figure 2 and Figure 3 As shown, the aforementioned brake 8 also includes an end cover 83, which is relatively fixed to the aforementioned fixed shaft assembly. The aforementioned friction member 82 is arranged between the end cover 83 and the armature 81. The friction member 82 can move along the axial direction of the rotor shaft 7. Among them, when the brake 8 is powered off, the armature 81 is used to be driven by the elastic member to press the friction member 82 against the end cover 83. At this time, one side of the friction member 82 abuts against the armature 81, and the other side of the friction member 82 abuts against the end cover 83. Both sides of the friction member 82 will generate friction resistance, so that the braking effect on the friction member 82 can be improved.

[0036] It should be noted that when the brake 8 is energized, the friction member 82 is separated from the end cover 83 to release the brake on the friction member 82, so that the rotor shaft 7 can rotate freely. Specifically, when the brake 8 is energized, the friction member 82 is used to separate from the end cover 83 under the action of inertia when the rotor shaft 7 rotates.

[0037] In some embodiments, the aforementioned friction member 82 may be a friction plate or the like.

[0038] In order to achieve the effect that the friction member 82 is circumferentially fixed to the rotor shaft 7 and the friction member 82 can move along the axial direction of the rotor shaft 7, as shown in FIG. Figure 3As shown, the friction member 82 can be sleeved on the rotor shaft 7, and a sleeve hole 801 is provided on the friction member 82, and the sleeve hole 801 is a non-circular hole. The rotor shaft 7 has a mounting portion 71 that is consistent with the shape of the sleeve hole 801, and the mounting portion 71 is fixed on the rotor shaft 7. The friction member 82 is sleeved on the mounting portion 71 of the rotor shaft 7 through the sleeve hole 801, and the sleeve hole 801 and the mounting portion 71 are slidably matched in the axial direction of the rotor shaft 7. In a specific application example, the sleeve hole 801 can be a square hole, and accordingly, the mounting portion 71 has a square outer contour.

[0039] In the above example, by providing a non-circular hole on the sleeve hole 801 to cooperate with the assembly portion 71 on the rotor shaft 7 , the friction member 82 is circumferentially fixed to the rotor shaft 7 , and the friction member 82 can move along the axial direction of the rotor shaft 7 .

[0040] In order to realize the function of the aforementioned speed reduction mechanism, Figure 1 As shown, the aforementioned speed reduction mechanism may include a sun gear 6, planetary gears 3 and an inner gear ring 4. The planetary gear 3 is meshed between the sun gear 6 and the inner gear ring 4. The rotor shaft 7 is used to drive the sun gear 6 to rotate, so that the sun gear 6 drives the inner gear ring 4 to rotate through the planetary gears 3. The inner gear ring 4 is connected to the wheel hub 2 to drive the wheel hub 2 to rotate.

[0041] In the above example, the sun gear 6 can be sleeved on one end of the rotor shaft 7 to rotate under the drive of the rotor shaft 7. The aforementioned fixing member includes a planetary gear carrier 5, and the planetary gear 3 is rotatably arranged on the planetary gear carrier 5. One end of the aforementioned hub 2 is sleeved on the fixed shaft 1 and rotates with the fixed shaft 1. The other end of the hub 2 is sleeved on the rotor shaft 7 and rotates with the rotor shaft 7. Among them, the fixed shaft 1 and the rotor shaft 7 cooperate to provide support for the hub 2.

[0042] It should be noted here that the aforementioned inner gear ring 4 can be integrally formed on the inner side of the wheel hub 2 to improve the connection stability between the inner gear ring 4 and the wheel hub 2 .

[0043] The aforementioned fixed shaft 1 has through holes 101 passing through both ends, and the through holes 101 are used for routing the aforementioned motor wires.

[0044] The utility model also provides a lawn mower robot, which can include any of the above brakeable hub reduction motors. In particular, because the lawn mower robot adopts the above brakeable hub reduction motor, when the lawn mower robot is turned off, the hub reduction motor is powered off, and the brake 8 is also powered off at this time. The brake 8 brakes the rotor shaft 7, thereby preventing the wheel hub 2 from rotating and preventing the lawn mower robot from sliding down.

[0045] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0046] The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the utility model should be included in the protection scope of the utility model. The above is only a preferred implementation of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the utility model, and these improvements and variations should also be regarded as the protection scope of the utility model.

Claims

1. A brakeable hub reduction motor, characterized in that: It comprises a fixed shaft assembly, on which a stator assembly (9), a rotor shaft (7), a speed reduction mechanism, a wheel hub (2) and a brake (8) are arranged; The stator assembly (9) is used to drive the rotor shaft (7) to rotate, and the rotor shaft (7) drives the wheel hub (2) to rotate through a speed reduction mechanism; The brake (8) is used to brake the rotor shaft (7) when power is off, and to release the brake on the rotor shaft (7) when power is on.

2. The brakeable hub reduction motor according to claim 1, characterized in that: The brake (8) comprises an electromagnet (84), an elastic member and an armature (81); a friction member (82) is circumferentially fixed on the rotor shaft (7); When the brake (8) is powered off, the electromagnet (84) is powered off, and the elastic member drives the armature (81) to abut against the friction member (82), so as to brake the rotor shaft (7) through the friction member (82); When the brake (8) is energized, the electromagnet (84) is energized, and the electromagnet (84) drives the armature (81) to separate from the friction member (82), so as to release the brake on the rotor shaft (7).

3. The brakeable hub reduction motor according to claim 2, characterized in that: The brake (8) further comprises an end cover (83), wherein the end cover (83) and the fixed shaft assembly are relatively fixed, and the friction member (82) is arranged between the end cover (83) and the armature (81); The friction member (82) can move along the axial direction of the rotor shaft (7); when the brake (8) is powered off, the armature (81) is driven by an elastic member to press the friction member (82) against the end cover (83); when the brake (8) is powered on, the friction member (82) is separated from the end cover (83).

4. The brakeable hub reduction motor according to claim 3, characterized in that: When the brake (8) is energized, the friction member (82) is used to separate from the end cover (83) under the action of inertia force when rotating with the rotor shaft (7).

5. The brakeable hub reduction motor according to claim 3 or 4, characterized in that: The friction member (82) is sleeved on the rotor shaft (7); a sleeve hole (801) is provided on the friction member (82); the sleeve hole (801) is a non-circular hole; the rotor shaft (7) has a mounting portion (71) having a shape consistent with the sleeve hole (801); the friction member (82) is sleeved on the mounting portion (71) of the rotor shaft (7) through the sleeve hole (801); and the sleeve hole (801) and the mounting portion (71) are slidably matched in the axial direction of the rotor shaft (7).

6. The brakeable hub reduction motor according to claim 5, characterized in that: The sleeve hole (801) is a square hole.

7. The brakeable hub reduction motor according to any one of claims 1 to 4 and 6, characterized in that: The speed reduction mechanism comprises a sun gear (6), a planetary gear (3) and an inner gear ring (4), wherein the planetary gear (3) is meshed between the sun gear (6) and the inner gear ring (4); The rotor shaft (7) is used to drive the sun gear (6) to rotate, so that the sun gear (6) drives the inner ring gear (4) to rotate through the planetary gears (3); the inner ring gear (4) is connected to the wheel hub (2) to drive the wheel hub (2) to rotate.

8. The brakeable hub reduction motor according to claim 7, characterized in that: The inner gear ring (4) is integrally formed on the inner side of the wheel hub (2).

9. A lawn mowing robot, characterized in that: A brakeable hub reduction motor comprising any one of claims 1-8.

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