CN220510911U - National standard electric motor car has gear hub motor reduction gears to start and stop buffer unit - Google Patents
National standard electric motor car has gear hub motor reduction gears to start and stop buffer unit Download PDFInfo
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- CN220510911U CN220510911U CN202321953320.XU CN202321953320U CN220510911U CN 220510911 U CN220510911 U CN 220510911U CN 202321953320 U CN202321953320 U CN 202321953320U CN 220510911 U CN220510911 U CN 220510911U
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- 229910000639 Spring steel Inorganic materials 0.000 claims description 5
- 238000010030 laminating Methods 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000005347 demagnetization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
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Abstract
The utility model discloses a start-stop buffer device of a gear hub motor speed reducing mechanism of a national standard electric vehicle, which comprises a motor outer ring, a left end cover and an outer gear ring, wherein the outer gear ring is sleeved on the left side of the motor outer ring in a sliding manner; the outer circle of the outer gear ring is provided with a plurality of outer edge ratchet teeth, the inner circle of the outer ring of the motor is provided with a plurality of inner edge ratchet teeth, a plurality of arc-shaped spaces are formed between the outer gear ring and the outer ring of the motor, the M-shaped springs are embedded in the arc-shaped spaces, and the torque of the motor is transmitted to the outer ring of the motor through the M-shaped springs; when the motor is powered on and started, the M-shaped spring is forced to collapse and then drives the motor outer ring to rotate, and when the electric vehicle suddenly stops, the rotational inertia of the rotor enables the M-shaped spring to collapse further, so that the impact force born by the gear of the speed reducing mechanism during starting/stopping is weakened.
Description
Technical Field
The utility model relates to the technical field of motors of electric bicycles, in particular to a start-stop buffer device of a gear hub motor speed reducing mechanism of a national standard electric bicycle, which accords with 2018 edition of safety technical Specification of electric bicycles.
Background
The current national standard electric bicycle mainly adopts a full-disc type low-speed hub motor, hysteresis resistance exists in the motor, the electric bicycle is difficult to ride, and the pedal riding function is seriously weakened. The gear hub motor is like a Chinese patent CN03127256.8, an outer rotor motor and a planetary gear speed reducing mechanism are arranged in a motor shell, the speed reducing mechanism has a one-way clutch function, hysteresis resistance influence is eliminated, the gear hub motor has the definite advantages of long continuous mileage and good riding sliding performance, the gear hub motor is limited by a lubricating technology of the speed reducing mechanism, a planetary gear made of polymer materials is generally adopted at present, the motor shell is small in size and low in heat dissipation speed, the application field is basically limited to light vehicles such as power-assisted electric bicycles with tires with narrow diameters and large diameters, rated power is set between 200W-300W according to different input voltages, and the gear hub motor cannot be directly used for new national standard electric vehicles.
The main faults of the geared hub motor are demagnetization of magnetic steel caused by temperature rise and tooth breakage of a planetary gear caused by impact force of starting and stopping of a vehicle. The power-assisted electric bicycle hub motor with the large wheel diameter generally sets a Hall position sensor in the motor, a pedal starts the electric bicycle hub to rotate, and the controller can supply power to the motor after detecting a hub rotation signal, so that the starting impact damage of the planetary gear is avoided.
The gear hub motor cannot be applied to the national standard electric bicycle until now, mainly because the motor is small in size and rated power and meets the national standard upper limit of 400w, the temperature rise of the motor is difficult to control, the physical property of a planetary gear of a polymer is reduced due to the temperature rise of a machine body, gear breakage occurs, the pedal riding function of the traditional national standard electric bicycle is seriously weakened, and the gear breakage fault is easy to occur when the vehicle is started.
Experiments show that when the gear is broken and the gear is damaged by the impact of the rotational inertia of the rotor rotating at high speed during emergency stop, the CN202021283379.9 gear protection mechanism of the hub motor is suitable for the hub motor of the large-wheel-diameter power-assisted electric bicycle with steel wire spokes, the speed reduction mechanism adopts two-stage speed reduction, the elastic body is a spiral spring, and the sample bicycle is ridden for three years, so that the broken gear fault can be thoroughly avoided; because the national standard electric vehicle is small in wheel diameter and usually adopts a hub with the specification of 10 inches, if a two-stage speed reduction scheme is adopted, the rotating speed of a driving motor of the national standard electric vehicle at least needs 2400rpm, the idle current of the hub motor is larger than 1.5A, the efficiency advantage of a speed reduction motor is reduced, the heat is increased instead, the rotating speed of the driving motor in the power-assisted hub motor is about 1200rpm, the speed reduction ratio is set between 4.29 and 5.0, and the idle current is not more than 0.6A, so that the national standard electric vehicle is provided with the gear hub motor and can only adopt a one-stage speed reduction mode; and because the main shaft specification of national standard car motor is greater than helping hand formula electric bicycle motor, the number of teeth of sun gear can consequently increase, and the external tooth reduces too much number of teeth because of setting up protection mechanism, can influence the settlement of reduction gear ratio of reduction mechanism.
Disclosure of Invention
Aiming at the characteristics and requirements of the main stream national standard vehicles in the market, the utility model provides the start-stop buffer device of the primary speed reducing mechanism of the gear hub motor of the national standard electric vehicle, which greatly reduces the impact force suffered by the planetary gears when the electric vehicle starts and stops, and achieves the aim of maintenance-free whole cycle life of the speed reducing mechanism.
For this purpose, the utility model provides the following scheme:
the utility model discloses a start-stop buffer device of a gear hub motor speed reducing mechanism of a national standard electric vehicle, which comprises a motor outer ring and a left end cover of the gear hub motor, and an outer ring of the gear hub motor speed reducing mechanism, wherein the outer ring is in sliding sleeve joint with the left inner circle of the motor outer ring; the outer circumferential array of the outer gear ring is provided with a plurality of outer edge ratchet teeth, the inner circle of the motor outer ring is provided with a plurality of inner edge ratchet teeth in a circumferential array at the installation position of the outer gear ring, and after the outer gear ring is sleeved into the motor outer ring, the outer edge ratchet teeth and the inner edge ratchet teeth are mutually attached, so that a plurality of arc-shaped spaces are formed between the outer gear ring and the motor outer ring;
the M-shaped springs are arc springs with axially bent spring steel bars, the arc shapes of the arc springs are consistent with the outer circle of the outer gear ring, the radial heights of the outer edge ratchet teeth and the inner edge ratchet teeth are slightly larger than the radial thickness of the spring steel bars, the M-shaped springs are embedded in the arc-shaped space by pre-stressing, the occupied radial space is small, the torque of the motor is transmitted to the outer gear ring, and the torque is transmitted to the outer ring of the motor through the M-shaped springs; when the motor is powered on and started, the M-shaped spring is driven to rotate after being stressed and collapsed, and when the electric vehicle scram, the rotational inertia of the motor rotor enables the M-shaped spring to collapse further, so that the impact force born by the gear of the speed reducing mechanism during starting/stopping is weakened.
Preferably, the outer ring gear and the M-shaped spring are mounted from the left side of the motor outer ring: the motor outer ring is connected with the left end cover through a bolt, the left end cover is provided with an annular spigot sleeved on the inner circle of the motor outer ring, and the motor outer ring is provided with an annular flange on the right side of the inner edge ratchet teeth; after the outer gear ring is arranged on the left side of the motor outer ring, the M-shaped spring is embedded in the arc-shaped space from the left side of the motor outer ring, and the outer gear ring and the M-shaped spring are axially limited and positioned between the annular spigot and the annular flange.
Preferably, the outer ring gear and the M-shaped spring are mounted from the right side of the motor outer ring: the motor outer ring and the left end cover are molded into an integral structure, an annular flange is arranged on the left side of an inner edge ratchet tooth of the motor outer ring, an annular clamping groove is formed on the right side of the inner edge ratchet tooth, after the outer tooth ring is installed on the right side of the motor outer ring, the M-shaped spring is embedded into the arc-shaped space from the right side of the motor outer ring, an inner clamping spring is embedded into the annular clamping groove, and the outer tooth ring and the M-shaped spring are axially limited and positioned between the annular flange and the inner clamping spring.
Compared with the prior art, the utility model has the following technical effects:
the starting and stopping buffer device of the gear hub motor speed reducing mechanism of the national standard electric vehicle has small radial occupied space of the M-shaped spring, can be applied to the gear hub motor with primary speed reduction, and can meet the setting of the speed reduction ratio of the speed reducing mechanism; the M-shaped spring is simple and convenient to install, and meets the requirement of mass production; the impact force of a gear of a speed reducing mechanism during starting and stopping of the vehicle is reduced in multiple, and especially during emergency stopping, the gear is damaged due to inertia impact caused by high-speed rotation of a rotor, so that the problem of gear breakage is fundamentally solved.
Drawings
Fig. 1 is a schematic diagram of a start-stop buffer device of a gear hub motor reduction mechanism of a national standard electric vehicle in this embodiment;
fig. 2 is a schematic diagram of a three-dimensional structure of a start-stop buffer device of a gear hub motor reduction mechanism of another national standard electric vehicle in the embodiment;
fig. 3 is a cross-sectional view A-A of fig. 1.
Reference numerals illustrate: 1, an outer ring of a motor; 2, a left end cover; 3, an outer gear ring; 4, outer edge ratchet teeth; 5 inner edge ratchet teeth; 6 arc-shaped space; 7M spring; 8 flanges; 9 clamping grooves; 10, a snap spring; 11 annular flanges; 12 annular spigot.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.
As shown in fig. 1 to 3, the utility model discloses a start-stop buffer device of a gear hub motor speed reducing mechanism of a national standard electric vehicle, which comprises a motor outer ring 1 and a left end cover 2 of the gear hub motor, and an outer gear ring 3 of the gear hub motor speed reducing mechanism, wherein the outer gear ring 3 is in sliding sleeve connection with the left side of the motor outer ring 1; the outer circumferential array of the outer gear ring 3 is provided with a plurality of outer edge ratchet teeth 4, the motor outer ring 1 is provided with a plurality of inner edge ratchet teeth 5 in the circumferential array at the installation position of the outer gear ring 3, and after the outer gear ring 3 is sleeved into the motor outer ring 1, the outer edge ratchet teeth 4 and the inner edge ratchet teeth 5 are mutually attached, so that a plurality of arc-shaped spaces 6 are formed between the outer gear ring 3 and the motor outer ring 1;
the motor is characterized by further comprising a plurality of M-shaped springs 7, wherein the M-shaped springs 7 are arc springs with axially bent spring steel bars, the radial heights of the outer edge ratchet teeth 4 and the inner edge ratchet teeth 5 are slightly larger than the radial thickness of the spring steel bars, the M-shaped springs 7 are embedded in the arc space 6 by pre-stressing, and the torque of the motor is transmitted to the outer tooth ring 3 and is transmitted to the motor outer ring 1 through the M-shaped springs 7; when the motor is powered on and started, the M-shaped spring 7 is forced to collapse and then drives the motor outer ring 1 to rotate, and when the electric vehicle scram, the moment of inertia of the motor rotor enables the M-shaped spring 7 to collapse further, so that the impact force born by the gear of the speed reducing mechanism during starting/stopping is weakened.
Embodiment one:
as shown in fig. 1, the motor outer ring 1 and the left end cover 2 are molded into an integral structure, and the M-shaped spring 7 is mounted from the inner circle on the right side of the motor outer ring 1.
The motor outer ring 1 is provided with an annular flange 8 on the left side of an inner edge ratchet tooth 5, the flange 8 is a positioning backing plate on the left side of an outer tooth ring 3 and an M-shaped spring 7, an annular clamping groove 9 is formed on the right side of the inner edge ratchet tooth 5, after the outer tooth ring 3 is installed in place, the outer edge ratchet tooth 4 and the inner edge ratchet tooth 5 are mutually attached, the M-shaped spring 7 is embedded into the arc-shaped space 6 with a pre-force, then an inner clamping spring 10 is embedded into the annular clamping groove 9, and the inner clamping spring 10 is the positioning backing plate on the right side of the outer tooth ring 3 and the M-shaped spring 7.
Embodiment two:
as shown in fig. 2, the motor outer ring 1 is connected with the left end cover 2 by bolts, and the outer gear ring 3 and the M-shaped spring 7 are mounted from the left side of the motor outer ring 1.
The motor outer ring 1 is provided with an annular flange 11 on the right side of the inner edge ratchet teeth 5, the left end cover 2 is provided with an annular spigot 12 sleeved on the inner circle of the motor outer ring 1, the outer ring gear 3 is installed from the left side of the motor outer ring 3, the outer edge ratchet teeth 4 and the inner edge ratchet teeth 5 are mutually attached, the M-shaped spring 7 is embedded into the arc-shaped space 6 from the left side under the pre-force, the left end cover 2 is finally installed on the motor outer ring 1, and the outer ring gear 3 and the M-shaped spring 7 are axially limited and positioned between the annular spigot 12 and the annular flange 11.
The M-shaped spring is formed by round steel or rectangular steel bars, the radial occupied space is about 2-3 mm, the setting influence on the reduction ratio of the reduction mechanism is small, in the embodiment, the number of teeth of the outer gear ring is 89, and when the reduction ratio is 4.68, the diameter of the main shaft of the motor can reach 17mm, and the structural stability of the hub motor is good; the M-shaped spring has good formability, is in an arc-shaped structure consistent with the outer gear ring, has low requirements on a pre-force mounting process, and is suitable for the requirements of mass production.
Claims (3)
1. The national standard electric vehicle is provided with a gear hub motor speed reducing mechanism start-stop buffer device, which comprises a motor outer ring and a left end cover of the gear hub motor and an outer ring gear of the gear hub motor speed reducing mechanism, wherein the outer ring gear is in sliding sleeve connection with the left side of the motor outer ring; the outer circumference of outer ring gear is arranged with a plurality of outer fringe ratchet teeth to the array, the motor outer lane is in outer ring gear's mounted position circumference array has arranged a plurality of inner fringe ratchet teeth, outer ring gear embolias the motor outer lane, outer fringe ratchet teeth with inner fringe ratchet teeth laminating each other, from this outer ring gear with be formed with a plurality of arc space between the motor outer lane, its characterized in that:
the motor is characterized by further comprising a plurality of M-shaped springs, wherein the M-shaped springs are arc springs with axially bent spring steel bars, the M-shaped springs are embedded in the arc space, torque of the motor is transmitted to the outer gear ring, and the torque is transmitted to the outer ring of the motor through the M-shaped springs; when the motor is powered on and started, the M-shaped spring is driven to rotate after being stressed and collapsed, and when the electric vehicle scram, the rotational inertia of the motor rotor enables the M-shaped spring to collapse further, so that the impact force born by the gear of the speed reducing mechanism during starting/stopping is weakened.
2. The start-stop buffer device for a gear hub motor speed reducing mechanism of a national standard electric vehicle according to claim 1, wherein the outer gear ring and the M-shaped spring are installed from the left side of the motor outer ring: the motor outer ring is connected with the left end cover through a bolt, the left end cover is provided with an annular spigot sleeved on the inner circle of the motor outer ring, and the motor outer ring is provided with an annular flange on the right side of the inner edge ratchet teeth; after the outer gear ring is arranged on the left side of the motor outer ring, the M-shaped spring is embedded in the arc-shaped space from the left side of the motor outer ring, and the outer gear ring and the M-shaped spring are axially limited and positioned between the annular spigot and the annular flange.
3. The start-stop buffer device for a gear hub motor speed reducing mechanism of a national standard electric vehicle according to claim 1, wherein the outer gear ring and the M-shaped spring are installed from the right side of the motor outer ring: the motor outer ring and the left end cover are molded into an integral structure, an annular flange is arranged on the left side of an inner edge ratchet tooth of the motor outer ring, an annular clamping groove is formed on the right side of the inner edge ratchet tooth, after the outer tooth ring is installed on the right side of the motor outer ring, the M-shaped spring is embedded into the arc-shaped space from the right side of the motor outer ring, an inner clamping spring is embedded into the annular clamping groove, and the outer tooth ring and the M-shaped spring are axially limited and positioned between the annular flange and the inner clamping spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321953320.XU CN220510911U (en) | 2023-07-24 | 2023-07-24 | National standard electric motor car has gear hub motor reduction gears to start and stop buffer unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321953320.XU CN220510911U (en) | 2023-07-24 | 2023-07-24 | National standard electric motor car has gear hub motor reduction gears to start and stop buffer unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220510911U true CN220510911U (en) | 2024-02-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321953320.XU Active CN220510911U (en) | 2023-07-24 | 2023-07-24 | National standard electric motor car has gear hub motor reduction gears to start and stop buffer unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220510911U (en) |
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2023
- 2023-07-24 CN CN202321953320.XU patent/CN220510911U/en active Active
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