Rear axle assembly of scooter

Abstract

The utility model discloses a scooter rear axle assembly and relates to the technical field of scooters. The scooter rear axle assembly comprises a motor and a differential mechanism, a differential mechanism gear is arranged on the differential mechanism, the differential mechanism is connected with a reduction gear shell, the motor is connected to the side face of the reduction gear shell, a transmission shaft is arranged in the reduction gear shell, and the transmission shaft is connected with the differential mechanism gear. According to the scooter rear axle, through the arrangement of a two-stage speed reduction structure, the power density of the motor is increased, the weight and the size of the scooter rear axle are greatly reduced, and therefore the scooter can meet the requirements of light weight, high reliability and the like in the current market. The power density is high; and the cost performance is high.

Description

Technical Field

[0001] The utility model relates to the technical field of scooters, in particular to a rear axle assembly of a scooter. Background Art

[0002] As the competition in the mobility scooter market becomes increasingly fierce, customers are increasingly demanding the overall cost-effectiveness of products. At present, the conventional mobility scooter rear axles in the market are mainly based on only one-stage reduction. Due to the limitation of the reduction ratio, the power density of the motor cannot be increased, and the size of the motor cannot be reduced, resulting in a large rear axle, heavy weight, and low power density, which does not meet the current market requirements for mobility scooters. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a rear axle assembly of a scooter, which solves the problems of large volume, heavy weight and low power density of the existing rear axles of scooters.

[0004] The utility model is realized through the following technical solutions.

[0005] The utility model discloses a rear axle assembly of a scooter, comprising a motor and a differential, wherein the differential is provided with a differential gear, the differential is connected with a reduction gear housing, the motor is connected to the side of the reduction gear housing, a transmission shaft is provided in the reduction gear housing, support bearings and force bearings are respectively provided at both ends of the transmission shaft, and the support bearing is located at the side where the motor is located.

[0006] Furthermore, the size of the load bearing is 1.1-1.3 times the size of the support bearing.

[0007] Furthermore, the transmission shaft has a screw axial tightening structure, and the axial force direction of the transmission shaft is from the supporting bearing to the force bearing.

[0008] Furthermore, a motor shaft is provided in the motor, and a first matching tooth is provided on the motor shaft.

[0009] Furthermore, a first transmission gear is fixedly provided on one side of the transmission shaft, and the first transmission gear is meshed with the first matching tooth.

[0010] Furthermore, the transmission shaft is provided with a second mating tooth, and the second mating tooth is meshed with the differential gear.

[0011] Furthermore, the motor may be connected to an electromagnetic brake.

[0012] Beneficial effects of the utility model: the utility model not only increases the power density of the motor by setting a two-stage reduction structure, but also greatly reduces the weight and volume of the rear axle of the scooter, so that the scooter meets the current market demand for lightweight, high power density and high cost performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a structural cross-sectional view of an embodiment of the utility model;

[0015] Figure 2 It is a diagram of a deceleration structure of an embodiment of the utility model;

[0016] Figure 3 It is an installation schematic diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0017] Combine the following Figure 1-3 The utility model is described in detail. For the convenience of description, the directions mentioned below are defined as follows: the up, down, left, right, front and back directions mentioned below are the same as Figure 1 The up-down, left-right, front-back directions of the projection relationship itself are consistent.

[0018] The general implementation method is:

[0019] Combined with Figure 1-3 The rear axle assembly of a scooter comprises a motor 01 and a differential 10, wherein the differential 10 is provided with a differential gear 09, and the left and right sides of the differential 10 are respectively provided with a short semi-axle 13 and a long semi-axle 12, and the short semi-axle 13 and the long semi-axle 12 are respectively fixedly connected to wheels.

[0020] The differential 10 is connected to a reduction gear housing 04, the motor 01 is connected to the side of the reduction gear housing 04, and the reduction gear housing 04 is provided with a two-stage reduction structure, namely a primary reduction structure and a secondary reduction structure.

[0021] The motor 01 is provided with a motor shaft 02 , and the motor shaft 02 is provided with a first matching tooth 18 . The motor 01 serves as a power source to drive the motor shaft 02 to rotate.

[0022] A transmission shaft 05 is provided in the reduction gear housing 04, and a first transmission gear 07 is fixedly provided on one side of the transmission shaft 05. The first transmission gear 07 meshes with the first matching tooth 18, so that the first transmission gear 07 on the transmission shaft 05 and the first matching tooth 18 on the motor shaft 02 form a primary reduction structure.

[0023] The transmission shaft 05 is provided with a second mating tooth 11 , which meshes with the differential gear 09 , thereby forming a two-stage reduction structure with the second mating tooth 11 on the transmission shaft 05 and the differential gear 09 .

[0024] Through the above technical solution, compared with the conventional mechanism with only one-stage reduction, by adding one stage of reduction, the original one-stage reduction is adjusted to two-stage reduction, and the speed ratio is increased from the original 19-20 to 28-29, and the speed ratio is increased by nearly 50%, thereby reducing the volume of the motor by nearly 50% and reducing the weight by nearly 50%.

[0025] At the same time, due to the increase in speed ratio, under the same working conditions, the torque required by the motor will be smaller, so the specification of the electromagnetic brake will be changed from 3N.m electromagnetic brake to 2N.m electromagnetic brake. In this way, the weight of the electromagnetic brake will be reduced from the original 400g to 230g, and the weight of the electromagnetic brake will be reduced by 42.5%, so the weight of the scooter will be significantly reduced.

[0026] A support bearing 06 and a force bearing 08 are respectively disposed at both ends of the transmission shaft 05. The support bearing 06 is located on the side where the motor 01 is located. The size of the force bearing 08 is 1.1-1.3 times the size of the support bearing 06. The transmission shaft 05 has a screw axial tightening structure. The axial force direction of the transmission shaft 05 is from the support bearing 06 to the force bearing 08.

[0027] Due to the addition of a first-stage reduction gear, the center distance of the gear is too small, which will cause the bearing selection for the fixed gear to be too small, making the bearing unable to withstand the axial pressure brought by the gear transmission.

[0028] In the above technical solution, by enlarging the outermost bearing and axially tightening the first-stage reduction gear through screws, all axial forces brought by the transmission of the first-stage gear are borne by the outermost bearing, thereby improving the service life of the entire assembly.

[0029] With the help of mature welding technology, the long and short half-axles are welded together from the original solid steel, making the half-axles consist of half solid steel and half hollow steel. The long and short axles formed in this way are 30% lighter than before the change.

[0030] An electromagnetic brake 15 can be added to the motor 01 to add a ramp parking function to the scooter, so that the motor 01 is locked. The electromagnetic brake 15 is installed at the end of the motor 01 through a protective cover.

[0031] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology in this field to understand the content of the utility model and implement it, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A rear axle assembly of a scooter, comprising a motor (01) and a differential (10), wherein the differential (10) is provided with a differential gear (09), characterized in that: The differential (10) is connected to a reduction gear housing (04), the motor (01) is connected to a side of the reduction gear housing (04), a transmission shaft (05) is arranged inside the reduction gear housing (04), and support bearings (06) and force bearings (08) are respectively arranged at both ends of the transmission shaft (05), and the support bearing (06) is located on the side where the motor (01) is located.

2. The rear axle assembly of a scooter according to claim 1, characterized in that: The size of the load bearing (08) is 1.1-1.3 times the size of the support bearing (06).

3. The rear axle assembly of a scooter according to claim 2, characterized in that: The transmission shaft (05) has a screw axial tightening structure, and the axial force direction of the transmission shaft (05) is from the supporting bearing (06) to the force bearing (08).

4. The rear axle assembly of a scooter according to claim 1, characterized in that: A motor shaft (02) is provided inside the motor (01), and a first matching tooth (18) is provided on the motor shaft (02).

5. The rear axle assembly of a scooter according to claim 4, characterized in that: A first transmission gear (07) is fixedly provided on one side of the transmission shaft (05), and the first transmission gear (07) is meshed with the first matching tooth (18).

6. The rear axle assembly of a scooter according to claim 5, characterized in that: The transmission shaft (05) is provided with a second matching tooth (11), and the second matching tooth (11) is meshed with the differential gear (09).

7. The rear axle assembly of a mobility scooter according to claim 1, characterized in that: The motor (01) can be connected to an electromagnetic brake (15).

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