CN207997763U - Motor rear axle drives buffer with motor - Google Patents

Abstract

The utility model discloses a kind of motor rear axle motors to drive buffer, include the motor and driving box input shaft of drive connection, helical spline axle sleeve buffering connection structure is provided between the output shaft and driving box input shaft of the motor so that generate speed difference between the output shaft and driving box input shaft of motor and form non-rigid connection structure.The buffer of the utility model is applied between the motor and driving box input shaft of electric vehicle; speed difference is generated using helical spline fit structure; to form non-rigid connection; the speed discrepancy of starting moment can be alleviated; ensure that starting is steady, and the stall phenomenon that big resistance starts situation can be alleviated, protects motor; power consumption and overheat are reduced, the service life of motor is extended.

Description

Motor-driven buffer for electric vehicle rear axle

technical field

The utility model relates to a drive buffer, which belongs to the technical field of electric vehicles, in particular to a motor-driven helical gear buffer for the rear axle of the electric vehicle.

Background technique

Electric vehicles are a zero-emission, low-noise and lightweight means of transportation, suitable for use in occasions where the speed limit is not high, especially in small and medium-sized cities and towns. In the electric vehicle structure, the motor drive structure is a key core structure. At present, the motor drive structure for a three-wheeled electric vehicle with a drive box is basically rigidly connected between the output shaft of the motor and the input transmission shaft of the drive box through rigid parts such as gears. The following disadvantages exist in the use of electric vehicles. For example, when the electric vehicle just starts, it is easy to cause a mismatch between the instantaneous large torque and high speed of the motor and the driving wheel shaft, resulting in a speed difference at the moment of starting and causing the electric vehicle to start. It is easy to move, and there are certain safety hazards. On the other hand, when the electric vehicle encounters a large resistance to start, it is prone to stall phenomenon, which not only consumes power, but also easily causes damage and overheating to the motor, affecting the use of the motor and other transmission mechanisms. life.

Utility model content

The purpose of this utility model is to overcome the defects and deficiencies in the prior art, and provide a motor-driven buffer for the rear axle of an electric vehicle. The formation of a non-rigid connection can alleviate the speed difference at the moment of starting, ensure a smooth start, and can alleviate the stalling phenomenon in the case of high resistance starting, protect the motor, and reduce power consumption and overheating.

In order to achieve the above object, the utility model is realized according to the following technical solutions:

A motor-driven buffer for the rear axle of an electric vehicle, comprising a motor with a transmission connection and an input drive shaft of a drive box, and a helical spline sleeve buffer connection structure is arranged between the output shaft of the motor and the input drive shaft of the drive box , so that there is a speed difference between the output shaft of the motor and the input transmission shaft of the drive box to form a non-rigid connection structure.

Further, the buffer connection structure of the helical spline bushing includes a helical spline bushing respectively connected to the output shaft of the motor and the input transmission shaft of the drive box, and the first thrust force on both sides of the helical spline bushing. The spring and the second thrust spring, wherein: the inner wall of the end of the helical spline bushing that is connected to the output shaft of the motor is provided with a straight-tooth inner spline, and the end of the helical spline bushing that is connected to the input drive shaft of the drive box The inner wall is provided with a helical tooth internal spline; the first thrust spring is sleeved outside the output shaft of the motor, and the two ends are in contact with the limit step of the motor output shaft and one end of the helical tooth spline bushing respectively; the second The thrust spring is sheathed on the outside of the input drive shaft of the drive box, and the two ends respectively abut against the limit step of the input drive shaft of the drive box and the other end of the helical spline shaft sleeve.

Further, the end of the output shaft of the motor docked with the helical tooth spline sleeve is provided with a straight tooth external spline that cooperates with the straight tooth internal spline of the helical tooth spline sleeve; the input transmission shaft of the drive box is connected to the The end of the butt joint of the helical tooth spline shaft sleeve is provided with a helical tooth external spline cooperating with the helical tooth internal spline of the helical tooth spline shaft sleeve.

Compared with the prior art, the utility model has the beneficial effects as follows:

The buffer of the utility model is applied between the motor of the electric vehicle and the input transmission shaft of the drive box, and adopts a helical tooth spline matching structure to generate a speed difference, thereby forming a non-rigid connection, which can alleviate the speed difference at the moment of starting and ensure a stable start. Moreover, it can alleviate the stalling phenomenon in the case of high resistance starting, protect the motor, reduce power consumption and overheating, and prolong the service life of the motor.

In order to understand the utility model more clearly, the specific implementation manner of the utility model will be described in detail below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the structural representation of the utility model.

FIG. 2 is an enlarged schematic view of A in FIG. 1 .

Detailed ways

As shown in Figures 1 and 2, a motor-driven buffer for the rear axle of an electric vehicle described in the utility model includes a motor 1 and a drive box 2 connected by a transmission, and the output shaft 11 of the motor 1 and the drive box input transmission A helical spline bushing buffer connection structure 3 is arranged between the shafts 21, so that a speed difference is generated between the output shaft 11 of the motor and the input transmission shaft 21 of the drive box to form a non-rigid connection structure.

The helical spline sleeve buffer connection structure 3 includes a helical spline sleeve 31 respectively connected to the output shaft of the motor and the input transmission shaft of the drive box, and the first thrust springs located on both sides of the helical spline sleeve. 32 and the second thrust spring 33, wherein: the end inner wall of the helical tooth spline shaft sleeve 31 docked with the output shaft 11 of the motor is provided with a straight tooth internal spline 311, and the helical tooth spline shaft sleeve 31 is connected to the drive box input transmission The inner wall of the butt end of the shaft is provided with a helical tooth internal spline 312; the first thrust spring 32 is sleeved on the outside of the output shaft 11 of the motor, and the two ends are respectively connected with the limit step of the motor output shaft and one end of the helical tooth spline sleeve. part abutting contact; the second thrust spring 33 is sheathed on the outside of the drive box input drive shaft 21 and its two ends respectively abut against the other end of the limit step of the drive box input drive shaft and the helical spline sleeve.

Further, the end of the output shaft 11 of the motor docked with the helical tooth spline sleeve is provided with a straight tooth external spline 111 that cooperates with the straight tooth internal spline of the helical tooth spline sleeve; the drive box input transmission The end of the shaft 21 abutting with the helical tooth spline bushing is provided with a helical tooth outer spline 211 that cooperates with the helical tooth inner spline of the helical tooth spline bushing.

The working principle of the utility model is as follows: Since the output shaft of the motor and the input transmission shaft of the drive box form a non-rigid connection through the connection structure of the helical spline shaft sleeve, the output of the motor can be driven by the buffering effect of the helical spline. There is a speed difference between the shaft and the drive shaft transmission shaft within a certain angle, so that the speed difference at the moment of starting can be well alleviated, making the start smooth; and when the stroke of the helical spline shaft sleeve reaches the limit position, the output of the motor at this time A rigid transmission connection is also formed between the shaft and the input transmission shaft of the drive box to ensure the normal use of the electric vehicle; on the other hand, the buffering effect of the helical spline shaft sleeve can also relieve the motor from stalling when starting with high resistance phenomenon, reduce power consumption and overheating, protect the motor, and prolong the service life of the motor.

The utility model is not limited to the above-mentioned specific embodiments, if the various changes or modifications of the utility model do not depart from the spirit and scope of the utility model, if these changes and modifications belong to the claims of the utility model and within the equivalent technical scope , the utility model is also intended to include these changes and modifications.

Claims (3)

1. A motor-driven buffer for the rear axle of an electric vehicle, comprising a motor and a drive box input transmission shaft connected by transmission, characterized in that: a helical tooth flower is arranged between the output shaft of the motor and the drive box input transmission shaft The key shaft sleeve buffer connection structure makes a speed difference between the output shaft of the motor and the input transmission shaft of the drive box to form a non-rigid connection structure. 2. According to claim 1, the motor-driven buffer for the electric vehicle rear axle is characterized in that: the helical tooth spline bushing buffer connection structure includes an oblique shaft respectively connected to the output shaft of the motor and the input transmission shaft of the drive box. Toothed spline bushing, and the first thrust spring and the second thrust spring located on both sides of the helical toothed spline bushing, wherein: the inner wall of the end of the helical toothed spline bushing connected with the output shaft of the motor is provided with straight teeth Inner spline, helical tooth spline shaft sleeve and the end inner wall of the input transmission shaft of the drive box are provided with a helical tooth inner spline; the first thrust spring is worn outside the output shaft of the motor, and the two ends are respectively connected to the output shaft of the motor. The limit step is in contact with one end of the helical spline shaft sleeve; the second thrust spring is worn outside the input drive shaft of the drive box and the two ends are respectively connected to the limit step of the drive box input drive shaft and the helical spline shaft The other end of the sleeve abuts against the contact. 3. The motor-driven buffer for the rear axle of an electric vehicle according to claim 2, characterized in that: the end of the output shaft of the motor docked with the helical spline bushing is provided with a straight joint with the helical spline bushing. The straight-toothed external splines matched with the internal splines of the teeth; the end of the drive box input transmission shaft and the helical-toothed spline sleeve is provided with a helical-toothed external spline that cooperates with the helical-toothed internal spline of the helical-toothed spline sleeve. splines.