CN214690024U - Two-wheeled electric vehicle and bottom fork structure thereof - Google Patents

Abstract

The utility model provides a two-wheeled electric vehicle and a bottom fork structure thereof, wherein the bottom fork structure comprises a driving motor, a speed reducing mechanism, two opposite supporting arms, a driving shaft and a hub shaft, and the two ends of the driving shaft and the hub shaft are respectively and rotatably connected on the two supporting arms; the driving motor and the speed reducing mechanism are respectively positioned on the two supporting arms, and the hub shaft is a hollow shaft; the driving shaft penetrates through the hub shaft, and one end of the driving shaft is in transmission connection with the output shaft of the motor; the other end is in transmission connection with the input end of the speed reducing mechanism, and the hub shaft is in transmission connection with the output end of the speed reducing mechanism. Through reducing mechanism and driving motor's separately setting for the weight on chain stay both sides distributes evenly, very big promotion holistic balance performance, solved the poor problem of electronic chain stay equilibrium among the prior art.

Description

Two-wheeled electric vehicle and bottom fork structure thereof

Technical Field

The utility model relates to an electric motor car technical field especially relates to a two-wheeled electric motor car and chain stay structure thereof.

Background

The electric vehicle is favored by consumers due to the advantages of convenient use, easy parking, environmental protection and the like. The national standard of electric vehicles implemented in 2010, which refers to electric bicycles with a speed of more than 40 kilograms and more than 20 kilometers per hour, is classified as light electric motorcycles or electric motorcycles into the category of motor vehicles. In order to control the relevant parameters of the electric vehicle under the standard, many manufacturers pursue a light-weight and compact structure; because of the limitation of the highest speed and power, the motor specification is small, the electric vehicle can be used in plain areas, but the electric vehicle is lack of power when arriving at mountainous and hilly areas with uneven roads.

In order to solve the problem, some manufacturers guarantee a certain driving force by equipping the motor with a speed reducing mechanism, so that the power performance is improved. The Chinese invention patent with the patent number of CN202010825812.5 provides a side-hung driving motor assembly; the whole structure is compact by integrating the speed reducing mechanism into the bottom fork, and the whole balance is good by arranging the mounting cavity; however, the balance is good and only opposite, and the supporting arm of the motor and the speed reducing mechanism is much heavier than the other supporting arm and is not beautiful. Chinese patent No. CN201510485874.5 discloses an integrated motor with a planetary reduction mechanism, which has the problems of heavy weight, light weight and poor symmetry, although the overall radial space occupied by the power structure is small. Also there is some electric motor cars to set up the motor in wheel hub's top, gives through chain drive or belt drive and gives and give wheel hub for power transmission, for chinese utility model patent that patent number is CN201820367332.7, although this kind of symmetry degree of setting up can be accomplished betterly, but radial transmission distance is big, for gear drive or direct drive, transmission efficiency is obviously not enough.

SUMMERY OF THE UTILITY MODEL

To the not enough that exists among the prior art, the utility model provides a two-wheeled electric motor car and chain stay structure thereof has solved the poor problem of electric motor car equilibrium among the prior art.

A bottom fork structure of an electric vehicle comprises a driving motor, a speed reducing mechanism, two opposite supporting arms, a driving shaft and a hub shaft, wherein two ends of the driving shaft and two ends of the hub shaft are respectively and rotatably connected to the two supporting arms; the driving motor and the speed reducing mechanism are respectively positioned on the two supporting arms, and the hub shaft is a hollow shaft; the driving shaft penetrates through the hub shaft, and one end of the driving shaft is in transmission connection with an output shaft of the driving motor; the other end is in transmission connection with the input end of the speed reducing mechanism, and the hub shaft is in transmission connection with the output end of the speed reducing mechanism.

According to the utility model discloses an embodiment, the utility model discloses a theory of operation does: the utility model discloses a cooperation between hollow wheel hub axle and the drive shaft transmits back rethread reduction gears behind one of them support arm of power transmission to another support arm for reduction gears and driving motor can set up respectively on two support arms.

Further, the drive shaft and the hub shaft are coaxially disposed.

Further, the speed reducing mechanism comprises a speed reducing shaft, a driving gear and a hub gear; the driving gear is fixed on the driving shaft, the hub gear is fixed on the hub shaft, the speed reducing shaft is rotatably connected on the supporting arm, and the speed reducing shaft is respectively provided with a first transmission gear and a second transmission gear which are matched with the driving gear and the hub gear.

Furthermore, driving motor includes rotor shaft and stator, is equipped with the installation cavity of installation driving motor on one of them support arm, and the stator is fixed on the installation intracavity wall, and the rotor shaft rotates to be connected in the installation cavity and the drive shaft rotates along with the rotor shaft.

Furthermore, the rotor shaft and the driving shaft are in matched transmission through splines, and a bearing for rotary connection is sleeved outside the matched position.

Furthermore, the bottom fork structure further comprises a connecting cylinder, the connecting cylinder is sleeved outside the hub shaft, one end of the connecting cylinder is fixed on one of the supporting arms, and the hub shaft extends out of the connecting cylinder.

The utility model also provides an electric motor car including above-mentioned chain stay structure, it still includes wheel hub, and the part that the wheel hub axle stretches out outside the connecting cylinder still is fixed with flange, wheel hub and flange fixed connection.

Furthermore, a drum brake is further sleeved on the connecting cylinder, and a brake bottom plate of the drum brake is fixedly connected with the supporting arm and sleeved outside the connecting cylinder.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the weight distribution on two sides of the bottom fork is uniform through the separate arrangement of the speed reducing mechanism and the driving motor, so that the integral balance performance is greatly improved; and a new structure is not added, and the whole transmission efficiency is high.

2. The driving motor and the speed reducing mechanism are respectively arranged behind the two supporting arms, the mounting space required by each supporting arm is almost the same, the structure after mounting is relatively uniform, local protrusions caused by the fact that the motor and the speed reducing mechanism are mounted simultaneously are avoided, and the whole structure is more attractive.

Drawings

Fig. 1 is a schematic diagram of the external structure of the present invention.

FIG. 2 is an illustration of a mounting cavity.

FIG. 3 is a schematic view of a reduction mechanism;

fig. 4 is a schematic view of the transmission system of the present invention.

FIG. 5 is another perspective schematic view of the transmission system.

Fig. 6 is a schematic structural view of a hub connection.

Fig. 7 is a position display diagram of the connecting cylinder and the flange.

FIG. 8 is a schematic of a drum brake position.

Wherein, 1, a supporting arm; 2. a mounting cavity; 3. a speed reduction mechanism; 4. a drive shaft; 5. a hub shaft; 6. a connecting cylinder; 7. a hub; 8. a drum brake; 31. a deceleration shaft; 32. a first drive gear; 33. a second transmission gear; 34. a drive gear; 35. a hub gear; 51. and connecting the flanges.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and embodiments.

As shown in fig. 1-3, the utility model provides an electric vehicle bottom fork structure, which comprises a driving motor, a speed reducing mechanism 3, two supporting arms 1 arranged oppositely, a driving shaft 4 and a hub shaft 5, wherein both ends of the driving shaft 4 and the hub shaft 5 are respectively connected to the two supporting arms 1 in a rotating way; the driving motor and the speed reducing mechanism 3 are respectively positioned on the two supporting arms 1, and the hub shaft 5 is a hollow shaft; the driving shaft 4 penetrates through the hub shaft 5, and one end of the driving shaft 4 is in transmission connection with the output shaft of the motor; the other end is connected with the input end of the speed reducing mechanism 3 in a transmission way, and the hub shaft 5 is connected with the output end of the speed reducing mechanism 3 in a transmission way.

The rotational connection of the drive shaft 4 and the hub axle 5 is realized by means of bearings arranged at the respective ends in cooperation with corresponding mounting frames arranged inside the housing of the support arm 1. In this embodiment, the drive shaft 4, which is located through the interior of the hub axle 5, is longer than the hub axle 5 for the coupling, so that bearings for the rotational coupling with the support arm 1 and gears for the transmission are provided. The utility model, through the hollow design of the hub shaft 5, the driving shaft 4 can transmit the power to the speed reducing mechanism 3 without influencing the installation and rotation of the hub 7; and further realizes the separate arrangement of the driving motor and the speed reducing mechanism 3. In practice, the drive shaft 4 and the hub shaft 5 are coaxially arranged. This facilitates the arrangement and design of the individual gears.

Preferably, as shown in fig. 3 to 5, the reduction mechanism 3 includes a reduction shaft 31, a drive gear 34, and a hub gear 35; the driving gear 34 is fixed on the driving shaft 4, the hub gear 35 is fixed on the hub shaft 5, the speed reducing shaft 31 is rotatably connected on the supporting arm 1, and the speed reducing shaft 31 is provided with a first transmission gear 32 and a second transmission gear 33 which are matched with the driving gear 34 and the hub gear 35 respectively. The utility model discloses regard as the input shaft of reduction gears 3 with drive shaft 4, the effect that reduction shafts 31 are used for transmission power and realize slowing down and increase the drive power, and wheel hub axle 5 is as the output shaft. The size relationship between the gears in the reduction mechanism 3 should be understood by those skilled in the art for the need of reduction and increase of the driving force. Corresponding frames are arranged in the supporting arms 1 for supporting.

Preferably, driving motor includes rotor shaft and stator, is equipped with installation driving motor's installation cavity 2 on installation driving motor's the support arm 1, and the stator is fixed on 2 inner walls of installation cavity, and the rotor shaft rotates to be connected in installation cavity 2 and driving shaft 4 rotates along with the rotor shaft. The rotor shaft and the drive shaft 4 are connected by splines or other means of bringing about rotation. A bearing sleeve for rotating the connection is established in rotor shaft and drive shaft 4's spline cooperation department, can give rotor shaft and drive shaft 4 simultaneously and support, practices thrift the inside installation space of support arm 1.

Preferably, as shown in fig. 6-7, the bottom fork structure further includes a connecting cylinder 6, the connecting cylinder 6 is sleeved outside the hub axle 5 and has one end fixed to one of the supporting arms 1, and the hub axle 5 partially extends out of the connecting cylinder 6. The arrangement of the connecting cylinder 6 can provide main radial support for the hub 7, and prevent the hub shaft 5 from being directly subjected to excessive radial force; the hub axle 5 is more used for driving the hub 7 to rotate.

The utility model also provides a two-wheeled electric motor car, including above-mentioned chain stay structure, still include wheel hub 7, wheel hub shaft 5 stretches out the outer part of connecting cylinder 6 and still is fixed with flange 51, wheel hub 7 and flange 51 fixed connection. The connecting flange 51 is fixedly connected with the side surface of the hub 7, and the hub 7 is rotatably connected with the connecting cylinder 6. The connecting cylinder 6 can be extended from the side surface of the supporting arm 1 and is integrally arranged with the supporting arm 1, so that the strength is ensured.

Preferably, as shown in fig. 8, a drum brake 8 is further sleeved on the connecting cylinder 6, and a brake bottom plate of the drum brake 8 is fixedly connected with the supporting arm 1 and is sleeved outside the connecting cylinder 6. The setting mode of drum brake 8 can be gone on according to its conventional setting, also can select other brakers, just the utility model discloses the installation space of keeping away from flange 51 one side between connecting cylinder 6 structure and the wheel hub 7 that set up just agrees with this braking structure mutually. The drum brake 8 mainly includes a brake base plate, a brake drum, and brake shoes; the utility model discloses a support arm 1 is fixed with the brake bottom plate along the axial bulge of connecting cylinder 6, and the brake drum is then fixed on wheel hub 7, wholly occupies radial space little and the braking is stable.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims (8)

1. The electric vehicle bottom fork structure comprises a driving motor, a speed reducing mechanism and two opposite supporting arms, and is characterized by further comprising a driving shaft and a hub shaft, wherein two ends of the driving shaft and two ends of the hub shaft are respectively and rotatably connected to the two supporting arms; the driving motor and the speed reducing mechanism are respectively positioned on the two supporting arms, and the hub shaft is a hollow shaft; the driving shaft penetrates through the hub shaft, and one end of the driving shaft is in transmission connection with an output shaft of the driving motor; the other end of the speed reducer is in transmission connection with the input end of the speed reducing mechanism; the hub shaft is in transmission connection with the output end of the speed reducing mechanism.

2. The bottom fork structure for electric vehicles according to claim 1, wherein the driving shaft and the hub shaft are coaxially disposed.

3. The bottom fork structure of an electric vehicle as claimed in claim 2, wherein the speed reducing mechanism comprises a speed reducing shaft, a driving gear and a hub gear; the driving gear is fixed on the driving shaft, the hub gear is fixed on the hub shaft, the speed reducing shaft is rotatably connected in the supporting arm, and the speed reducing shaft is respectively provided with a first transmission gear and a second transmission gear which are matched with the driving gear and the hub gear.

4. The bottom fork structure of claim 1, wherein the driving motor comprises a rotor shaft and a stator, wherein one of the supporting arms is provided with a mounting cavity for mounting the driving motor, the stator is fixed on the inner wall of the mounting cavity, the rotor shaft is rotatably connected in the mounting cavity, and the driving shaft rotates along with the rotor shaft.

5. The bottom fork structure of claim 4, wherein the rotor shaft and the driving shaft are driven by spline fitting, and a bearing for rotational connection is externally sleeved at the fitting position.

6. The chain stay structure of any one of claims 1-5 further comprising a connecting tube, wherein the connecting tube is sleeved outside the hub shaft and has one end fixed to one of the support arms, and the hub shaft extends out of the connecting tube.

7. A two-wheeled electric vehicle, characterized by comprising the bottom fork structure as recited in claim 6, and further comprising a hub, wherein a connecting flange is further fixed to a portion of the hub shaft extending out of the connecting cylinder, and the hub is fixedly connected with the connecting flange.

8. The two-wheeled electric vehicle as recited in claim 7, wherein said connecting cylinder is further provided with a drum brake, and a brake bottom plate of said drum brake is fixedly connected with said supporting arm and is fitted over said connecting cylinder.

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