CN213402721U

CN213402721U - Gear protection mechanism of in-wheel motor

Info

Publication number: CN213402721U
Application number: CN202021283379.9U
Authority: CN
Inventors: 眭华兴
Original assignee: Hui Huaxing
Current assignee: Hui Huaxing
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2021-06-08
Anticipated expiration: 2030-07-03

Abstract

The utility model discloses a gear protection mechanism of in-wheel motor, there are motor and planetary gear reduction mechanism in the inner space that wheel hub and end cover enclose, be equipped with a plurality of power tooth of biography on the surface of outer ring gear among the planetary gear reduction mechanism, be equipped with a plurality of atress tooth on the internal surface of wheel hub or the interior lining of end cover, the outer disc that passes the power tooth cup joints with wheel hub's internal surface activity, the interior disc of atress tooth cup joints with the surface activity of outer ring gear, it is equipped with the elastomer to pass between power tooth and the atress tooth, when electric bicycle starts/parks, the elastomer produces the deformation of collapsing, thereby make planetary gear reduction mechanism's gear avoid the impact damage. The utility model discloses solved wheel hub motor's disconnected tooth trouble effectively, the inertia of rotor is to the impact of gear when starting torque that can slow down the motor and parking, prolongs the cycle life of gear train among the reduction gears by a wide margin.

Description

Gear protection mechanism of in-wheel motor

Technical Field

The utility model relates to an in-wheel motor's gear protection mechanism belongs to electric bicycle's in-wheel motor technical field.

Background

The hub motor with gear is a driving motor for an electric bicycle with compact structure and high energy efficiency ratio, and is generally characterized in that a driving motor and a planetary gear reduction mechanism are arranged in an inner space surrounded by a hub and an end cover, wherein the planetary gear reduction mechanism is also combined with a one-way clutch, such as Chinese patents CN03127256.8 and CN201510104597.9 of an outer rotor motor with a through shaft structure, such as US patent US20050176542A1 of an inner rotor motor with a half shaft structure, such as CN201811376287.2 and CN201910757289.4, and is a hub motor with gear in an axial magnetic field, and the planetary gear of the hub motors is generally made of polymer materials such as nylon or polyformaldehyde with good wear resistance and self-lubricating property. When the electric bicycle is started/stopped and accelerated/decelerated, a gear of a deceleration mechanism bears larger impact force, and a planetary gear with lower structural strength has broken teeth, so that the phenomenon is easier to occur in cold winter, and the electric bicycle which accords with the new national standard in the market still largely adopts a full-disc type low-speed hub motor with low continuous running capability.

SUMMERY OF THE UTILITY MODEL

The purpose of the invention is as follows: in order to overcome the not enough of existence among the prior art, the utility model provides an in-wheel motor's gear protection mechanism, the inertia of rotor when starting torque that can slow down the motor and parking is to the impact of gear, prolongs the life cycle of gear train among the reduction gears by a wide margin, improves the application scope who has geared in-wheel motor.

The technical scheme is as follows: in order to solve the technical problem, the gear protection mechanism of the in-wheel motor of the utility model comprises a motor and a planetary gear reduction mechanism, wherein the motor and the planetary gear reduction mechanism are positioned in an inner space enclosed by a wheel hub and an end cover, the wheel hub and the end cover are sleeved on the main shaft in a rolling manner, and the wheel hub and the end cover are detachably and fixedly connected; the planetary gear speed reducing mechanism comprises a planetary carrier, an outer gear ring, a sun gear ring and a planetary gear, wherein the planetary carrier is provided with a one-way clutch, the sun gear ring is arranged on a rotor of the motor, the planetary carrier is fixedly sleeved on the main shaft, the planetary gear is rotatably arranged on a fixed shaft of the planetary carrier, the planetary gear is a duplicate gear and is meshed with the sun gear ring and the outer gear ring, the planetary gear speed reducing mechanism also comprises a plurality of force transmission teeth, a plurality of stress teeth and a plurality of elastic bodies, the force transmission teeth are arranged on the outer circular surface of the outer gear ring and are matched with the force transmission teeth, the stress teeth are arranged on the inner circular surface of a hub of the hub motor or the inner side surface of an end cover, the outer circular surface of the force transmission teeth is movably sleeved with the inner surface of the hub, the inner circular surface of the stress teeth is movably sleeved with the outer surface of the outer gear ring, the power of the motor is acted on the elastic body by the planetary gear speed reducing mechanism and then transmitted to the hub, and when the electric bicycle is started/stopped, the elastic body generates collapsing deformation, so that the gear of the planetary gear speed reducing mechanism is prevented from being damaged by impact.

Preferably, the elastic body is a steel spring or a rubber strip.

Preferably, a retaining ring is arranged on the inner side of the hub, and the retaining ring is a positioning backer of the outer gear ring and the elastic body.

Preferably, the force-bearing teeth are fixedly provided with baffle rings.

Has the advantages that: compared with the prior art, the utility model discloses solved the broken tooth trouble of in-wheel motor effectively, the inertia of motor is to the impact of gear when can slowing down the starting torque of motor and parking, prolongs the life cycle of gear train among the reduction gears by a wide margin, improves the application scope that has gear in-wheel motor and the stability of speed reduction in-wheel motor.

Drawings

Fig. 1 is a schematic structural diagram of a two-stage reduction hub motor according to the embodiment.

Fig. 2 is a schematic view of the gear protection mechanism according to the embodiment.

Fig. 3 is a schematic view of a gear protection mechanism with force transmitting teeth on a hub.

Fig. 4 is a schematic view of a gear protection mechanism with force transmitting teeth on the end cap.

Fig. 5 is a schematic structural view of the gear protection mechanism of the present embodiment after a retainer ring is installed.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

As shown in fig. 1, the present embodiment provides a gear protection mechanism for an in-wheel motor, including a wheel hub 1, an end cover 2 and a main shaft 3, the wheel hub 1 and the end cover 2 are sleeved on the main shaft 3 in a rolling manner, the wheel hub 1 and the end cover 2 are detachably and fixedly connected, a motor 4 and a planetary gear reduction mechanism 5 are disposed in an internal space enclosed by the wheel hub 1 and the end cover 2, the planetary gear reduction mechanism includes a planet carrier 6, an outer gear ring 7, a sun gear ring 8 and a planetary gear 9, the planet carrier 6 has a one-way clutch, the sun gear ring 8 is mounted on a rotor 10 of the motor 4, the planet carrier 6 is fixedly sleeved on the main shaft 3, the planetary gear 9 is rotatably mounted on a fixed shaft 11 of the planet carrier 6, the planetary gear 9 is a duplicate gear, a large gear 12 of the planet gear is.

As shown in fig. 1-4, the outer circular surface of the outer gear ring 7 is provided with a plurality of force transmission teeth 14, the hub 1 or the end cap 2 is provided with force receiving teeth 15 matching with the force transmission teeth 14, the outer circular surface of the force transmission teeth 14 is movably sleeved with the inner surface of the hub 1, the inner circular surface of the force receiving teeth 15 is movably sleeved with the outer circular surface of the outer gear ring 7, and the elastic members 16 are also provided, the number of which is equal to the number of the force transmission teeth 14, the elastic member 16 with the crumple energy absorption function is a steel spring or a rubber strip, the elastic member 16 is installed between the force transmission teeth 14 and the force receiving teeth 15, the power of the motor is acted on the elastic member 16 by the planetary gear mechanism, and then is transmitted to the force receiving teeth 15 by the elastic member 16 to drive the hub 1 to rotate, when the electric bicycle is started/stopped, the elastic member 16.

In order to prevent the outer gear ring 7 and the elastic body 16 from moving axially, the inner side of the hub 1 is provided with a retaining ring 17, the retaining ring 17 is integrally formed with the hub 1, and the outer gear ring 7 and the elastic body 16 are limited between the retaining ring 17 and the end cover 2; when the stressed teeth 15 are arranged on the end cover 2, another technical scheme is as follows: the retaining ring 17 is not arranged on the hub 1, and the retaining ring 18 is fixedly arranged on the stressed teeth 15 so as to limit the axial displacement of the outer gear ring 7 and the elastic body 16, as shown in figure 5.

The gear hub motor with the one-stage speed reduction is widely applied to light electric bicycles, an outer gear ring 7 and a sun gear ring 8 in a planetary gear speed reduction mechanism are generally molded and sintered by adopting SMC materials, a planetary gear 9 is mainly molded or machined by adopting PA and POM materials, the gear hub motor with the structure is low in torque bearing capacity, when the bicycle is started/stopped, the planetary gear 9 can break teeth, and particularly when the bicycle is suddenly stopped in winter, the tooth breaking fault is easy to occur. The utility model discloses a model machine, the tooth height of duplex planetary gear is less than the commercially available motor, installs on the electric bicycle that accords with new national standard, through the test more than a year, and the effect is very ideal, has realized the utility model discloses a purpose.

The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A gear protection mechanism of an in-wheel motor comprises a motor and a planetary gear reduction mechanism, wherein the motor and the planetary gear reduction mechanism are positioned in an internal space enclosed by a wheel hub and an end cover; planetary gear reduction unit includes planet carrier, outer ring gear, sun gear ring gear and planetary gear, the planet carrier has one way clutch, the sun gear ring gear is installed on the rotor of motor, the fixed cover of planet carrier is established on the main shaft, planetary gear rotates and installs on the dead axle of planet carrier, planetary gear is duplicate gear, and with the sun gear ring gear with outer ring gear meshing, its characterized in that: the elastic body is arranged between the force transmission teeth and the force receiving teeth, the power of the motor is acted on the elastic body by the planetary gear speed reducing mechanism and then transmitted to the hub, and when the electric bicycle is started/stopped, the elastic body generates collapsing deformation, so that the gear of the planetary gear speed reducing mechanism is prevented from being damaged by impact.

2. The gear protection mechanism of an in-wheel motor according to claim 1, wherein: the elastic body is a steel spring or a rubber strip.

3. The gear protection mechanism of an in-wheel motor according to claim 1, wherein: and a retainer ring is arranged on the inner side of the hub and is used for positioning the outer gear ring and the elastic body.

4. The gear protection mechanism of an in-wheel motor according to claim 1, wherein: and a baffle ring is fixedly arranged on the stress tooth.