CN203600986U - Integrated single-trailing-arm suspension silent chain speed reducing wheel side electric driving system - Google Patents

Abstract

The utility model discloses an integrated single trailing arm suspension toothed chain deceleration type wheel side electric drive system, which is assembled into an integrated drive assembly by a motor, a driving toothed chain wheel and a shaft, a small bearing, and a small bearing support. Fixed to the frame, it becomes part of the sprung mass. The driven toothed sprocket and the wheel swing together around the elastic hinge axis. There is a tight side and a loose side in the toothed chain transmission, and there is a certain variable range of center distance, so that when the driven toothed sprocket swings with the beating of the wheel, the driven toothed sprocket and the driving toothed sprocket and the The center distance of the shaft varies within an acceptable range, so the structural scheme is reasonable and reliable. At the same time, the toothed chain is used for power transmission, which has the characteristics of tight side and loose side, and has the advantages of variable center distance to ease road impact. A trailing arm rod is added to connect the straight trailing arm and the inclined trailing arm at both ends to improve the lateral stiffness of the single trailing arm. The utility model effectively reduces the unsprung mass and improves the ride comfort and wheel grounding performance of the automobile.

Description

Integrated single trailing arm suspension toothed chain deceleration wheel side electric drive system

technical field

The utility model belongs to the field of electric vehicle chassis and transmission, in particular to an integrated single trailing arm suspension toothed chain deceleration wheel side electric drive system. the

Background technique

With the continuous rise of electric vehicles, a variety of driving forms of electric vehicles have emerged. The size of the car's unsprung mass directly affects the ride comfort and wheel grounding of the car. At present, the wheel-side electric drive system represented by electric wheels has a simple drive system and vehicle structure, large available space, and high transmission efficiency. The torque of each drive wheel can be independently controlled, which is conducive to improving driving performance under harsh road conditions. performance has become a research hotspot. However, since the motor is installed in the drive wheel, the unsprung mass of the car is relatively large, which is not conducive to the smoothness of the car and the grounding of the wheel. the

In response to these problems, the main research directions at home and abroad are: the research of highly integrated electromechanical integration of electric wheels, the development of high power density motors, and structural innovations. In terms of structure, the invention patent 201110053092.6 proposes a structure and method for reducing the equivalent unsprung mass of the single-swing arm suspension wheel side electric drive system, which saves the constant velocity universal joint and the traditional centralized motor drive. The half shaft makes the structure more compact, which can effectively reduce the equivalent unsprung mass caused by the motor and other components, but it still cannot avoid using the motor as a part of the equivalent unsprung mass. As a new transmission method, the toothed chain has significant advantages such as high transmission precision, high reliability, strong wear resistance, large load capacity, high transmission efficiency, low noise and compact structure. It can be considered for wheel-side electric drive system transmission. the

Contents of the invention

The technical problem to be solved by the utility model is to propose an integrated single trailing arm suspension toothed chain deceleration wheel side electric drive system by comprehensively considering unsprung mass, deceleration and torque increase, and integrated design. the

The technical scheme that the utility model adopts is:

Integrated single trailing arm suspension toothed chain deceleration wheel side electric drive system, which includes wheel rim, half shaft bushing, wheel hub bearing, wheel hub, drive shaft, large bearing, driven toothed sprocket, inclined trailing arm, longitudinal Arm lever, motor, straight trailing arm, driving toothed sprocket and shaft, small bearing, small bearing support, frame, elastic rubber hinge. Among them, the motor, active toothed sprocket and shaft, small bearing, and small bearing support are assembled into an integrated drive assembly and fixed on the frame, which becomes a part of the sprung mass, thereby greatly reducing the unsprung mass . The active toothed sprocket and the driving toothed sprocket shaft are integrated into the active toothed sprocket and shaft, and the driving toothed sprocket and shaft are connected with the external splines of the motor output shaft through the inner spline of the active toothed sprocket shaft to realize power Output. The driving toothed sprocket and the shaft are installed and supported in the small bearing support through the small bearing, and are connected by the sleeves at both ends so that the outer ring does not rotate when the inner ring of the small bearing rotates. The small bearing support is connected with the motor by bolts. The driven wheel is respectively supported and installed on the oblique trailing arm and the straight trailing arm through the large bearings at both ends. , straight trailing arm and trailing arm rod are composed of three parts. The trailing arm rod is connected to the trailing arms at both ends by bolts to increase the lateral stiffness of the single trailing arm. The straight longitudinal arm is close to the end of the wheel rim and is connected with the half-shaft casing through bolts. The drive shaft is supported in the straight longitudinal arm through large bearings. The oblique longitudinal arm is installed outside the driven toothed sprocket. In the inclined longitudinal arm, both ends of the driven toothed sprocket are also connected to the large bearing through a sleeve so that the outer ring does not rotate when the inner ring of the large bearing rotates. Both the straight trailing arm and the oblique trailing arm are hinged to the vehicle frame through the elastic rubber hinge. The driven toothed sprocket and the single trailing arm are assembled into an integrated structure. The driving toothed sprocket and shaft are connected with the driven toothed sprocket through the toothed chain to realize power transmission. The driven toothed sprocket is connected with the drive shaft through a flat key and rotates together, and the hub transmits power to the rim through a bolt connection.

In the utility model, the positional relationship between the center of the power output axis of the motor and the single trailing arm can be obtained through theoretical calculation so that the change of the center distance between the driving toothed sprocket and the shaft and the driven toothed sprocket is the smallest . Because when the wheel jumps up and down under the action of random road excitation, the driven toothed sprocket will also swing around the elastic rubber hinge axis together with the single trailing arm. At this time, the driven toothed sprocket and the driving toothed sprocket and shaft The center distance of the wheel will change, so the utility model utilizes the advantages of toothed chain transmission, that is, the characteristics of tight side and loose side, so as to meet the requirement of variable center distance when the wheel is beating. Select the appropriate vertical height between the center of the motor output shaft and the center line of the straight trailing arm through theoretical calculation, so that the change of the center distance between the driven toothed sprocket, the driving toothed sprocket and the shaft can be controlled within the tension of the toothed sprocket Acceptable range, so that the structural scheme is feasible. the

The utility model has the advantages that the selected toothed chain transmission has the advantages of stable operation, low noise and constant transmission ratio. The efficiency of the toothed chain drive is also higher than that of the gear drive, and its drive center distance is not limited by the size of the sprocket. the

Selecting a suitable reduction transmission ratio between the toothed sprockets can reduce the speed and increase the torque. the

The optional braking system can use disc brakes or drum brakes. the

Arranging the motor on the frame greatly reduces the unsprung mass and improves the ride comfort and wheel grounding of the car. Utilizing the characteristics of toothed chain transmission, the transmission efficiency is improved, and the center distance is variable. the

Description of drawings

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

Fig. 2 is a schematic diagram of the motion relationship between the single trailing arm and the driving and driven sprockets of the present invention.

Detailed ways

Below in conjunction with accompanying drawing 1, accompanying drawing 2 the utility model is described further. the

The integrated single trailing arm suspension toothed chain deceleration wheel side electric drive system of the utility model includes: wheel rim 1, half shaft bushing 2, wheel hub bearing 3, wheel hub 4, drive shaft 5, large bearing 6, driven Toothed sprocket 7, inclined trailing arm 8, trailing arm rod 9, motor 10, straight trailing arm 11, driving toothed sprocket and shaft 12, small bearing 13, small bearing support 14, frame 15, elastic rubber hinge 16. the

Figure 1 is a schematic structural diagram of the integrated single trailing arm suspension toothed chain reduction wheel side electric drive system. The motor 10, the driving toothed sprocket and the shaft 12, the small bearing 13, and the small bearing support 14 are assembled into an integrated structure and fixed on the frame, which becomes a part of the sprung mass, thus greatly reducing the unsprung load. quality. The driving toothed sprocket and shaft 12 and the driving toothed sprocket shaft are integrated into the driving toothed sprocket and shaft, and the driving toothed sprocket and shaft 12 are connected to the external splines of the motor output shaft through the inner spline of the driving toothed sprocket shaft Connect to realize power output. The driving toothed sprocket and shaft 12 are installed and supported in the small bearing support 14 through the small bearing 13, and are connected by two ends of the sleeve (not marked in the figure) so that the outer ring does not rotate when the inner ring of the small bearing 13 rotates. The small bearing support 14 is connected with the motor 10 by bolts. The single trailing arm is composed of three parts: the diagonal trailing arm 8, the trailing arm rod 9 and the straight trailing arm 11. The trailing arm rod 9 is connected with the diagonal trailing arm 8 and the straight trailing arm 11 through bolts. The diagonal trailing arm 8, the trailing arm rod 9 The section of the straight longitudinal arm 11 and the straight longitudinal arm 11 are both I-beam structures, wherein the straight longitudinal arm 11 is close to the end of the rim 1 and is connected to the half shaft sleeve 2 through bolts, and the drive shaft 5 is supported in the straight longitudinal arm 11 through the large bearing 6. The two ends of the movable toothed sprocket 7 are connected with the large bearing 6 through a sleeve (not shown in the figure) so that the inner ring of the large bearing 6 turns and the outer ring does not turn. The oblique longitudinal arm 8 is installed on the outer side of the driven toothed sprocket 7 , and the drive shaft 5 is also supported in the oblique longitudinal arm 8 through the large bearing 6 . Both the straight trailing arm 11 and the inclined trailing arm 8 are hinged to the vehicle frame 15 through the elastic rubber hinge 16 . The driven toothed sprocket 7 and the single trailing arm (8, 9, 11) are assembled into an integrated structure. The driving toothed sprocket and shaft 12 are connected with the driven toothed sprocket 7 through a toothed chain (not shown in the figure) to realize power transmission. The driven toothed sprocket 7 is connected with the drive shaft 5 through a flat key. The drive shaft 5 is connected to the hub 4 through a spline, and finally the hub 4 transmits power to the rim 1 to realize power output. The power transmission route is: motor 10, driving toothed sprocket and shaft 12, driven toothed sprocket 7, drive shaft 5, wheel hub 4, rim 1. the

Figure 2 is a schematic diagram of the kinematic relationship between the single trailing arm and the driving and driven sprockets. Including: driven toothed sprocket 7, small bearing support 14, driving toothed sprocket and shaft 12, motor 10, vehicle frame 15. The positional relationship between the center A of the power output axis of the motor 10, the driving toothed sprocket and the shaft 12, and the single trailing arm (8, 9, 11) can be obtained through theoretical calculation so that the driving toothed sprocket, the shaft and the driven The center-to-center distance variation between toothed sprockets is minimal. When the wheel jumps up and down under the action of random road excitation, the driven toothed sprocket 7 will also swing around the elastic rubber hinge axis O along with the single trailing arm (8, 9, 11). At this time, the driven toothed sprocket 7 The center distance AD with the active toothed sprocket and the shaft 12 will change, so the utility model utilizes the advantages of the toothed chain transmission, that is, the characteristics of tight side and loose side, so that the center distance can be adjusted when the wheel is beating. change requirements. Select the appropriate vertical distance between the center A of the power output axis of the motor and the center line OD of the straight longitudinal arm through theoretical calculation, so that the center distance between the driven toothed sprocket 7, the driving toothed sprocket and the shaft 12 changes within the toothed chain The wheel tension is within the acceptable range, so that the structural scheme is feasible. the

In the utility model, the brake system can adopt disc brakes or drum brakes, and only need to install relevant brake components. the

In the utility model, selecting a suitable deceleration transmission ratio between the toothed sprockets can play the role of deceleration and torque increase. the

In the utility model, the toothed chain transmission is adopted, which has the advantages of high transmission precision, high reliability, strong wear resistance, large load capacity, high transmission efficiency, low noise, etc., and reduces related manufacturing costs. The transmission center distance is not limited by the size of the sprocket. the

In the utility model, the integrated wheel edge drive system can be used for non-steering wheels and used as a set. the

Claims (2)

1. Integrated single trailing arm suspension toothed chain deceleration wheel side electric drive system, including wheel rim, half shaft bushing, wheel hub bearing, wheel hub, drive shaft, large bearing, driven toothed sprocket, oblique trailing arm, Trailing arm rod, motor, straight trailing arm, driving toothed sprocket and shaft, small bearing, small bearing support, vehicle frame, elastic rubber hinge, characterized in that: motor, driving toothed sprocket and shaft, small bearing, The small bearing support is assembled into an integrated drive assembly and fixed on the frame, which becomes a part of the sprung mass, thereby greatly reducing the unsprung mass. The driving toothed sprocket and shaft transmit power through the toothed chain For the driven toothed sprocket, the driving toothed wheel and the shaft are installed and supported on the small bearing support through the small bearings at both ends, and the small bearing support is fixedly connected with the motor. On the arm and the straight trailing arm, there is a trailing arm rod connected between the inclined trailing arm and the straight trailing arm to improve the lateral stiffness of the single trailing arm. The driven wheel is connected with the drive shaft through a flat key and rotates together. The drive shaft and the hub adopt splines Connection, the hub is supported in the half-shaft casing fixedly connected with the straight trailing arm through the hub bearing, and the hub transmits power to the rim through bolt connection. 2. The integrated single trailing arm suspension toothed chain deceleration wheel side electric drive system according to claim 1, characterized in that: the trailing arm rod is connected to the straight trailing arm and the inclined trailing arm at both ends through bolts, so as to improve Lateral stiffness of a single trailing arm.

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