CN220586112U - Motor reducer assembly, garden tool driving mechanism and garden tool - Google Patents

Abstract

The utility model belongs to the technical field of garden tools, and in particular relates to a motor reducer assembly, a garden tool driving mechanism and a garden tool, which comprise the following components: a fixed shaft; the outer rotor motor comprises an outer rotor and an inner stator, wherein the inner stator is fixedly connected with the fixed shaft in a coaxial way, and the outer rotor is connected with the fixed shaft in a coaxial and rotary way; the power input end of the planetary reducer is fixedly connected with the outer rotor; the output shell is coaxially and rotatably connected with the fixed shaft, and is fixedly connected with the power output end of the planetary reducer. According to the utility model, the outer rotor motor is combined with the planetary reducer, so that the low-rotation-speed high-torque output is realized, the volume and the weight of the driving mechanism are reduced, and the flexibility and the cruising ability of the garden tool are improved.

Description

Motor reducer assembly, garden tool driving mechanism and garden tool

Technical Field

The utility model belongs to the technical field of garden tools, and particularly relates to a motor reducer assembly, a garden tool driving mechanism and a garden tool.

Background

The existing motor for the electric mower is a permanent magnet direct current motor with an inner rotor structure, at least two-stage reduction is needed, and the existing two-stage reduction comprises a parallel shaft output gear box and a planetary gear reduction box. The motor assembly is in order to meet the working demand of low-speed large torque, so that the whole motor assembly is large in size and heavy in weight, the dead weight of the whole motor assembly is increased, the load is increased, the endurance mileage of the whole motor assembly can be influenced under limited electric quantity, and meanwhile, the manufacturing cost and the selling price of the motor assembly are high.

The planetary gear of the existing external rotor planetary gear motor adopts a nylon gear, so that the service life of the planetary gear is greatly shortened, and the risk of failure of the gear is easy to occur under heavy load. Even change metal gear into, because metal gear needs lubricating grease to lubricate, current structure can make grease infiltration motor inside, leads to the motor to damage, promotes personnel's the possibility that takes place danger greatly.

When the existing motor is installed on the whole vehicle, a plurality of bolts are required to be installed at the connection position of the motor installation flange and the vehicle frame, time and labor are wasted, the phenomena of loosening, slipping and the like are easy to occur, and great risks are brought to the whole vehicle.

The existing gardening tool generally adopts electromagnetic braking, and the working principle is that a fixed value direct current voltage is connected to a coil, a brake pad is opened by electromagnetic force when the coil is electrified, and braking is closed when a power supply is disconnected, so that the electromagnetic braking starts working under the condition that the whole vehicle is electrified, but braking force cannot be provided in the driving process, and braking of the whole vehicle is realized by controlling forward and reverse rotation of a motor, so that great safety risk is brought to the whole vehicle, and higher driving technical requirements are also provided for a driver.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present utility model is to provide a motor reducer assembly, a garden tool driving mechanism and a garden tool, which are more compact in structure, and capable of reducing the motor assembly and the weight, thereby improving the cruising ability of the garden tool and reducing the manufacturing cost.

To achieve the above and other related objects, the present utility model provides a motor reducer assembly comprising:

a fixed shaft;

the outer rotor motor comprises an outer rotor and an inner stator, wherein the inner stator is fixedly connected with the fixed shaft in a coaxial way, and the outer rotor is connected with the fixed shaft in a coaxial and rotary way;

the power input end of the planetary reducer is fixedly connected with the outer rotor;

the output shell is coaxially and rotatably connected with the fixed shaft, and is fixedly connected with the power output end of the planetary reducer.

In an alternative embodiment of the present utility model, the outer rotor motor and the planetary reducer are accommodated in an accommodating cavity formed by the output casing.

In an alternative embodiment of the present utility model, the planetary reducer includes a sun gear, a planet carrier, a planet wheel and a gear ring, wherein the sun gear forms the power input end and is coaxially and fixedly connected with the outer rotor, the planet carrier is fixedly connected with the fixed shaft, the planet wheel is rotatably connected with the planet carrier, the gear ring forms the power output end and is fixedly connected with the output casing, and the planet wheel is meshed with the sun gear and the gear ring respectively.

In an alternative embodiment of the utility model, the inner stator is provided with a first central hole, which forms an interference fit with the stationary shaft.

In an alternative embodiment of the utility model, the outer rotor comprises a rotor assembly and a rotor end cap, the rotor assembly and the rotor end cap are fixedly connected, and the rotor end cap is rotatably connected with the fixed shaft through a bearing.

In an alternative embodiment of the present utility model, the sun gear includes a gear body and a support portion, and the support portion is fixedly connected with the outer rotor.

In an alternative embodiment of the present utility model, the output casing includes a front end cover, a cylindrical body, and a rear end cover, where the front end cover and the rear end cover are respectively and fixedly connected to two ends of the cylindrical body, the front end cover is rotatably connected to one end of the fixed shaft, which is far away from the outer rotor motor, through a bearing, and the rear end cover is rotatably connected to one end of the fixed shaft, which is far away from the planetary reducer, through a bearing.

In an alternative embodiment of the present utility model, rib plates are provided on the inner wall of the output casing, and the outer rotor motor and the planetary reducer are respectively located on two sides of the rib plates.

In an alternative embodiment of the utility model, the planet carrier is provided with a second central hole, which forms an interference fit with the stationary shaft.

In an alternative embodiment of the utility model, a ring groove is arranged on the fixed shaft at a position which is flush with the end face of the planet carrier, a clamping spring is arranged in the ring groove, and the clamping spring is abutted with the end face of the planet carrier.

In an alternative embodiment of the utility model, the gear ring forms an interference fit with the inner wall of the output housing.

To achieve the above and other related objects, the present utility model also provides a garden tool driving mechanism, comprising:

a fixed shaft;

the outer rotor motor comprises an outer rotor and an inner stator, wherein the inner stator is fixedly connected with the fixed shaft in a coaxial way, and the outer rotor is connected with the fixed shaft in a coaxial and rotary way;

the power input end of the planetary reducer is fixedly connected with the outer rotor;

the output shell is coaxially and rotatably connected with the fixed shaft and fixedly connected with the power output end of the planetary reducer;

and the rim is fixedly connected with the output shell.

In an alternative embodiment of the utility model, at least part of the structure of the output housing is housed within the rim.

In an alternative embodiment of the utility model, the device further comprises a brake mechanism, wherein the brake mechanism comprises a brake disc and a caliper, the brake disc is fixedly connected with one end of the output casing, which is far away from the rim, coaxially, and the caliper is fixedly arranged relative to the fixed shaft.

To achieve the above and other related objects, the present utility model also provides a garden tool, comprising:

a frame;

the fixed shaft is fixedly connected with the frame;

the outer rotor motor comprises an outer rotor and an inner stator, wherein the inner stator is fixedly connected with the fixed shaft in a coaxial way, and the outer rotor is connected with the fixed shaft in a coaxial and rotary way;

the power input end of the planetary reducer is fixedly connected with the outer rotor;

the output shell is coaxially and rotatably connected with the fixed shaft and fixedly connected with the power output end of the planetary reducer;

and the wheels are fixedly connected with the output shell.

The utility model has the technical effects that: according to the utility model, the outer rotor motor is combined with the planetary reducer, so that the low-rotation-speed high-torque output is realized, the volume and the weight of a driving mechanism are reduced, and the flexibility and the cruising ability of a garden tool are improved; in addition, the utility model adopts the outer rotor motor for driving, so the connection mode between the driving mechanism and the gardening tool becomes simpler, and the assembly efficiency and the integral reliability of the vehicle body structure are improved.

Drawings

Fig. 1 is a perspective view of a garden tool driving mechanism, provided by an embodiment of the present utility model;

fig. 2 is a perspective view of another view of the garden tool driving mechanism, provided by the embodiment of the present utility model;

fig. 3 is a cross-sectional view of a garden tool driving mechanism, as provided by an embodiment of the present utility model;

FIG. 4 is an exploded view of a garden tool drive mechanism, as provided by an embodiment of the present utility model;

FIG. 5 is an exploded view of a motor reducer assembly provided by an embodiment of the present utility model;

fig. 6 is an exploded view of an external rotor motor and a planetary reducer according to an embodiment of the present utility model.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.

It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present utility model by way of illustration, and only the components related to the present utility model are shown in the illustrations, not according to the number, shape and size of the components in actual implementation, and the form, number and proportion of each component in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.

The motor reducer assembly provided by the utility model can be applied to a walking driving mechanism of a garden tool, for example, the motor reducer assembly is arranged in wheels of the garden tool and used for driving the wheels to rotate, and the garden tool can be a mower, a scarifier, a snowplow and the like, and has higher requirements on the control flexibility, so that the structure is ensured to be compact as much as possible in the design process, on one hand, the size of the garden tool can be reduced, the steering flexibility and the passing performance in a narrow space of the garden tool can be improved, on the other hand, the weight of the garden tool can be reduced, the load can be further reduced, and the cruising ability can be improved; however, the garden tool driving mechanism in the prior art generally adopts a traditional inner rotor motor to be matched with a speed reducer, and the driving structure needs to be provided with a plurality of parallel shafts, so that the occupied space is large, the number of parts is large, the weight is heavy, and the cruising ability of the garden tool is influenced. According to the utility model, the outer rotor motor is combined with the planetary reducer, the outer rotor motor and the planetary reducer can be arranged on one axis, the volume of the driving mechanism is reduced, meanwhile, the connection mode between the outer rotor motor and the frame is simpler, the assembly is convenient, and the connection reliability is higher; the following describes the technical scheme of the present utility model in detail with reference to specific examples.

Referring to fig. 1 to 6, the garden tool driving mechanism provided by the embodiment of the present utility model comprises a motor reducer assembly 100 and a rim 60, wherein the motor reducer assembly 100 comprises a fixed shaft 10, an external rotor motor, a planetary reducer and an output housing 50; the outer rotor motor comprises an outer rotor 12 and an inner stator 11, wherein the inner stator 11 is fixedly connected with the fixed shaft 10 in a coaxial way, and the outer rotor 12 is rotatably connected with the fixed shaft 10 in a coaxial way; preferably, the planetary reducer can be coaxially arranged with the fixed shaft 10, and the power input end of the planetary reducer is fixedly connected with the outer rotor 12; the output casing 50 is coaxially and rotatably connected with the fixed shaft 10, and the output casing 50 is fixedly connected with the power output end of the planetary reducer; the rim 60 is fixedly connected to the output housing 50.

When the driving mechanism is installed on a gardening tool, the fixing shaft 10 is only required to be connected with a frame of the gardening tool, specifically, for example, a section of conical surface 14 and a section of thread surface 15 can be arranged at the end part of the fixing shaft 10, then the fixing shaft 10 is installed in a preset conical hole on the frame, the thread surface 15 passes through the conical hole, a screw cap 16 is installed on the thread surface 15, the conical surface 14 and the conical hole can be automatically aligned when the screw cap 16 is screwed, so that the fixing shaft 10 is fixed in a preset gesture, and the whole installation process only needs one screw cap 16, so that the installation difficulty is greatly reduced.

According to the utility model, the outer rotor motor is combined with the planetary reducer, so that the low-rotation-speed high-torque output is realized, the volume and the weight of a driving mechanism are reduced, and the flexibility and the cruising ability of a garden tool are improved; in addition, the utility model adopts the outer rotor motor for driving, so the connection mode between the driving mechanism and the gardening tool becomes simpler, and the assembly efficiency and the integral reliability of the vehicle body structure are improved.

Referring to fig. 3 and 5, in a specific embodiment, the outer rotor motor and the planetary reducer are accommodated in an accommodating cavity formed by the output casing 50, the output casing 50 is not only a power output component of the motor reducer assembly 100, but also an appearance component and a protection component of the motor reducer, and the outer rotor motor and the planetary reducer are accommodated in the output casing 50, so that the outer rotor motor and the planetary reducer can form a whole, and are convenient to manufacture and install, and sundries can be prevented from entering the outer rotor motor and the planetary reducer, and waterproof and dustproof performances of the motor reducer assembly 100 are improved.

Referring to fig. 3 and 6, in a specific embodiment, the planetary reducer includes a sun gear 20, a planet carrier 30, a planet wheel 31 and a gear ring 40, wherein the sun gear 20 forms a power input end and is coaxially and fixedly connected with the outer rotor 12, the planet carrier 30 is fixedly connected with the fixed shaft 10, the planet wheel 31 is rotatably connected with the planet carrier 30, the gear ring 40 forms a power output end and is fixedly connected with the output casing 50, and the planet wheel 31 is meshed with the sun gear 20 and the gear ring 40 respectively. It should be understood that when the outer rotor 12 rotates, the sun gear 20 can drive the sun gear 20 to rotate, and the sun gear 20 drives the planet gears 31 to rotate, at this time, because the planet carrier 30 is fixed, the planet gears 31 drive the gear ring 40 to rotate, and further drive the output housing 50 to rotate, so as to realize a speed reduction transmission from the outer rotor 12 to the output housing 50.

The connecting mode of the planetary reducer ensures that the space layout of each part is more compact on one hand, and a larger reduction ratio is easier to obtain on the other hand; it should be noted that, the connection manner of the planetary reducer is not unique, for example, in other alternative embodiments, the ring gear 40 may be fixedly connected to the fixed shaft 10, and the planet carrier 30 may be fixedly connected to the output housing 50; or the gear ring 40 is fixedly connected with the outer rotor 12, the planet carrier 30 is fixedly connected with the output casing 50, and the sun gear 20 is fixedly connected with the fixed shaft 10; these two alternative embodiments also achieve a reduction gear function, but in contrast, the embodiment of fig. 3 provides a simpler connection, facilitates the installation of the components, and saves more space.

Referring to fig. 3, in a specific embodiment, the inner stator 11 is provided with a first central hole, and the first central hole forms an interference fit with the fixed shaft 10; the outer rotor 12 comprises a rotor assembly 121 and a rotor end cover 122, the rotor assembly 121 is fixedly connected with the rotor end cover 122, and the rotor end cover 122 is rotationally connected with the fixed shaft 10 through a bearing; the sun gear 20 comprises a gear body 21 and a supporting part 22, and the supporting part 22 is fixedly connected with the outer rotor 12; the output casing 50 comprises a front end cover 51, a cylindrical body 52 and a rear end cover 53, wherein the front end cover 51 and the rear end cover 53 are respectively and fixedly connected with two ends of the cylindrical body 52, the front end cover 51 is rotationally connected with one end of the fixed shaft 10 far away from the outer rotor motor through a bearing, and the rear end cover 53 is rotationally connected with one end of the fixed shaft 10 far away from the planetary reducer through a bearing; the planet carrier 30 is provided with a second central hole, and the second central hole and the fixed shaft 10 form interference fit; a ring groove is arranged on the fixed shaft 10 and is flush with the end surface of the planet carrier 30, a clamp spring 13 is arranged in the ring groove, and the clamp spring 13 is abutted with the end surface of the planet carrier 30; the ring gear 40 forms an interference fit with the inner wall of the output housing 50.

The above embodiments split portions into multiple parts for ease of manufacture and installation, it being understood that the split of the components is not exclusive and in other embodiments, the components may be split in other ways to further simplify the process and assembly.

Referring to fig. 3, in a further embodiment, the inner wall of the output housing 50 is provided with a rib 521, the outer rotor motor and the planetary reducer are respectively located at two sides of the rib 521, a gap is provided between the rib 521 and the fixed shaft 10, the power input ends of the outer rotor 12 and the planetary reducer can be connected with each other through the gap, for example, the rib 521 can be disposed at the inner side of the cylindrical body 52, and the rib 521 can be rotatably connected with the supporting portion 22 of the sun gear 20 through a bearing; it should be appreciated that the rib 521 can separate the installation space of the planetary reducer and the outer rotor motor on one hand, and avoid the lubricating grease in the planetary reducer from entering into the outer rotor motor to cause the motor to be damaged, and on the other hand, the rib 521 can also assist in supporting the output housing 50, so as to improve the overall structural strength of the driving mechanism. In a preferred embodiment, in order to further isolate the installation space of the external rotor motor and the planetary reducer, a corresponding mechanical sealing device can also be provided between the support 22 of the sun gear 20 and the stationary shaft 10.

Referring to fig. 1-4, to further reduce the axial size of the drive mechanism, at least a portion of the structure of the output housing 50 may be received within the rim 60.

Referring to fig. 1, 2 and 4, in a further embodiment, the device further includes a brake mechanism 70, where the brake mechanism 70 includes a brake disc 71 and a caliper 72, the brake disc 71 is fixedly connected coaxially with an end of the output housing 50 away from the rim 60, the caliper 72 is fixedly disposed with respect to the fixed shaft 10, specifically, the brake disc 71 may be mounted on the rear end cover 53 by, for example, bolts, and the caliper 72 may be mounted on a frame of a gardening tool, for example.

In summary, the utility model combines the outer rotor motor with the planetary reducer, realizes low rotation speed and high torque output, and simultaneously reduces the volume and weight of the driving mechanism, and the motor reducer assembly 100 can be completely arranged in the wheels due to the reduction of the volume, thereby reducing the width of the gardening tool, improving the flexibility of the gardening tool, and improving the cruising ability of the gardening tool due to the reduction of the weight; in addition, the outer rotor motor is adopted for driving, so that the connection mode between the driving mechanism and the gardening tool is simpler, and the assembly efficiency and the overall reliability of the vehicle body structure are improved; the outer rotor motor and the planetary reducer are accommodated in the output casing 50, so that the outer rotor motor and the planetary reducer can form a whole, the manufacturing and the installation are convenient, sundries can be prevented from entering the outer rotor motor and the planetary reducer, and the waterproof and dustproof performances of the motor reducer assembly 100 are improved; the connection mode of the planetary reducer makes the space layout of each part more compact, and on the other hand, a larger reduction ratio is easier to obtain; the rib plate 521 can separate the installation space of the planetary reducer and the outer rotor motor on one hand, so that the damage of the motor caused by the lubricating grease in the planetary reducer entering into the outer rotor motor is avoided, and on the other hand, the rib plate 521 can also assist in supporting the output casing 50, so that the overall structural strength of the driving mechanism is improved; the utility model increases the active braking mechanism 70, improves the braking response speed, and further improves the overall safety performance of the garden tool.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (15)

1. A motor reducer assembly, comprising:

a fixed shaft;

the outer rotor motor comprises an outer rotor and an inner stator, wherein the inner stator is fixedly connected with the fixed shaft in a coaxial way, and the outer rotor is connected with the fixed shaft in a coaxial and rotary way;

the power input end of the planetary reducer is fixedly connected with the outer rotor;

the output shell is coaxially and rotatably connected with the fixed shaft, and is fixedly connected with the power output end of the planetary reducer.

2. The motor reducer assembly of claim 1, wherein said outer rotor motor and said planetary reducer are housed within a housing cavity formed by said output housing.

3. The motor reducer assembly of claim 1, wherein the planetary reducer comprises a sun gear, a planet carrier, a planet wheel and a gear ring, wherein the sun gear forms the power input end and is fixedly connected with the outer rotor coaxially, the planet carrier is fixedly connected with the fixed shaft, the planet wheel is rotatably connected with the planet carrier, the gear ring forms the power output end and is fixedly connected with the output casing, and the planet wheel is meshed with the sun gear and the gear ring respectively.

4. A motor reducer assembly according to claim 3, wherein the inner stator is provided with a first central bore, which forms an interference fit with the fixed shaft.

5. A motor reducer assembly according to claim 3, wherein the outer rotor comprises a rotor assembly and a rotor end cap, the rotor assembly and the rotor end cap being fixedly connected, the rotor end cap being rotatably connected to the stationary shaft by a bearing.

6. The motor reducer assembly of claim 3, wherein said sun gear comprises a gear body and a support portion, said support portion being fixedly connected to said outer rotor.

7. The motor reducer assembly of claim 6, wherein the output housing comprises a front end cover, a cylindrical body and a rear end cover, the front end cover and the rear end cover are fixedly connected with two ends of the cylindrical body respectively, the front end cover is rotatably connected with one end of the fixed shaft, which is far away from the outer rotor motor, through a bearing, and the rear end cover is rotatably connected with one end of the fixed shaft, which is far away from the planetary reducer, through a bearing.

8. The motor reducer assembly of claim 2, wherein the inner wall of the output housing is provided with rib plates, and the outer rotor motor and the planetary reducer are respectively located at two sides of the rib plates.

9. A motor reducer assembly according to claim 3, wherein the planet carrier is provided with a second central bore which forms an interference fit with the fixed shaft.

10. The motor reducer assembly of claim 9, wherein a ring groove is provided on the fixed shaft at a position flush with the end face of the planet carrier, and a snap spring is provided in the ring groove, and the snap spring abuts against the end face of the planet carrier.

11. A motor reducer assembly according to claim 3, wherein the ring gear forms an interference fit with the inner wall of the output housing.

12. A garden tool drive mechanism, comprising:

a fixed shaft;

the outer rotor motor comprises an outer rotor and an inner stator, wherein the inner stator is fixedly connected with the fixed shaft in a coaxial way, and the outer rotor is connected with the fixed shaft in a coaxial and rotary way;

the power input end of the planetary reducer is fixedly connected with the outer rotor;

the output shell is coaxially and rotatably connected with the fixed shaft and fixedly connected with the power output end of the planetary reducer;

and the rim is fixedly connected with the output shell.

13. A garden tool drive mechanism as claimed in claim 12, wherein at least part of the structure of the output housing is received in the rim.

14. The garden tool drive mechanism of claim 12, further comprising a brake mechanism comprising a brake disc and a caliper, wherein the brake disc is fixedly connected coaxially with the end of the output housing remote from the rim, and wherein the caliper is fixedly disposed relative to the stationary shaft.

15. A garden tool, comprising:

a frame;

the fixed shaft is fixedly connected with the frame;

the outer rotor motor comprises an outer rotor and an inner stator, wherein the inner stator is fixedly connected with the fixed shaft in a coaxial way, and the outer rotor is connected with the fixed shaft in a coaxial and rotary way;

the power input end of the planetary reducer is fixedly connected with the outer rotor;

the output shell is coaxially and rotatably connected with the fixed shaft and fixedly connected with the power output end of the planetary reducer;

and the wheels are fixedly connected with the output shell.