CN106740020A - Electric motor car deceleration, differential integrated driving rear axle assy - Google Patents

Abstract

The invention discloses a deceleration and differential integrated drive rear axle assembly for an electric vehicle, in which a motor, a planetary reducer and a spur gear differential are coaxially arranged, and the motor, planetary reducer, and spur gear are differentially arranged The integrated structure of the transmission is arranged, and the output shaft of the inner rotor motor directly transmits the power to the differential through the planetary reducer and finally to the wheels to drive the wheels. The planetary reducer and the spur gear differential adopted in the present invention have high transmission efficiency, reduce energy consumption, have low noise and are more energy-saving. The key point of the present invention is also to integrate the electric motor, reducer and differential, so that the overall structure is more compact, the volume is smaller, and the installation space is saved, thereby leaving more space for the electric vehicle chassis to install the battery.

Description

Rear axle assembly driven by deceleration and differential integrated drive for electric vehicles

technical field

The invention belongs to the field of rear axle assembly, and in particular relates to a deceleration and differential integrated drive rear axle assembly for an electric vehicle.

Background technique

In the face of the double crisis of energy and environment, the development of electric vehicles has become the direction of the future development of the automobile industry, and the drive rear axle of the existing electric vehicle is to install the motor with a reducer and fix it on the rear axle. Such a structural transmission system Too long, low transmission efficiency, high noise, large structure and other disadvantages.

Contents of the invention

In view of this, the purpose of the present invention is to improve the existing structure, by integrating the motor, speed reducer, differential, and rear axle, so as to obtain a small, simple and compact electric vehicle with integrated deceleration and differential speed Drive rear axle assembly.

In order to achieve the above object, the present invention provides the following technical solutions: an electric vehicle deceleration, differential integrated drive rear axle assembly, including a motor, a planetary reducer, a spur gear differential, a box body and a rear axle, Both the planetary reducer and the spur gear differential are arranged in the casing, and the electric motor is fixed on one side of the casing; the output shaft of the electric motor is a hollow structure.

The planetary reducer is mainly composed of a hollow sun gear shaft, a planet carrier and several planetary gears; the sun gear shaft is arranged on the right end cover of the box through a bearing, and a spline is arranged on the outer end of the box, and the spline Cooperate with the inner hole of the hollow motor output shaft; the planet carrier is supported in the box by bearings, and the box is also equipped with an inner ring gear, and each planetary gear is respectively arranged on the pin shaft at one end of the planet carrier through bearings and connected to the inner The ring gear meshes with the sun gear shaft at the inner end of the case.

The spur gear differential is mainly composed of sun gear I, sun gear II, several planetary gears I and planetary gear II, the sun gear I and sun gear II are both spur gears and the two wheel modules are and the number of teeth are the same, the planetary gear I and the planetary gear II are both spur gears and the modulus and number of teeth of the two wheels are the same; the sun gear I is set on the left end cover of the box through the bearing, and the sun gear II is set through the bearing In the inner hole of the planet carrier, and there is a gap between the sun gear I and the sun gear II, the planet gear I and the planet gear II are respectively arranged on the pin shaft at the other end of the planet carrier through bearings, and the part on the planet gear I The gear teeth mesh with the sun gear Ⅰ, some of the teeth on the planetary gear Ⅱ mesh with the sun gear Ⅱ, and the rest of the teeth on the adjacent planetary gears Ⅰ and Ⅱ mesh with each other and the meshing area is located at the side of the sun gear Ⅰ and Ⅱ. gap between.

The rear axle is mainly composed of rear bridge, wheel hub I, wheel hub II, short half-shaft and long half-shaft; one end of the short half-shaft is inserted into the inner hole of the sun gear I and connected with the sun gear I through a spline, The other end is connected to the hub I, and one end of the long half shaft passes through the inner hole of the motor output shaft, the hollow sun gear shaft and the inner hole of the sun gear II, and then is connected to the sun gear II through a spline, and the other end is connected to the hub II; The rear bridge is arranged outside the short semi-axis and the long semi-axis, and the box and the motor are fixed on the rear bridge.

Further, the casing of the motor has a water jacket.

Further, both ends of the hollow motor output shaft are supported on the motor end cover through bearings.

Further, nylon gaskets for sealing are provided between the left and right end covers of the box and the box.

Further, lubricating oil or grease is housed in the box.

The beneficial effect of the present invention is that: by coaxially setting the motor, the planetary reducer and the spur gear differential, the volume of the rear axle assembly is reduced, the structure is simpler and more compact, and it has high transmission efficiency and more energy saving. specialty. The smaller structural size saves space for the chassis of the electric vehicle, leaving more space for installing batteries; the spur gear differential is adopted, which is simple to manufacture and low in cost, making up for the shortcomings of the traditional bevel gear differential. The cross shaft has complex technology and is not easy to process. The layout of input and output at 90° takes up a lot of space in the axial direction, high cost, large axial force when the workpiece is running, and the disadvantages of easy wear and tear of the parts. In general, the integrated driving rear axle assembly changes the layout form, increases the torque, makes the transmission process more stable, greatly reduces the transmission friction loss, the output power loss is small, the service life is extended, and it is easy to maintain. The invention is widely used in the field of electric vehicles and can be refitted to various types of electric vehicles at will.

Description of drawings

In order to make the purpose, technical scheme and beneficial effect of the present invention clearer, the present invention provides the following drawings for illustration:

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a structural schematic diagram of an electric motor, a planetary reducer and a spur gear differential;

Fig. 3 is a sectional view taken along line A-A of Fig. 2 .

detailed description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in the figure, the deceleration and differential integrated drive rear axle assembly for electric vehicles in the present invention includes a motor 15, a planetary reducer, a spur gear differential, a casing 8 and a rear axle, and the planetary Both the speed reducer and the spur gear differential are arranged in the casing 8, and the motor 15 is fixed on one side of the casing 8; the output shaft 22 of the motor 15 is a hollow structure.

The planetary reducer is mainly composed of a hollow sun gear shaft 23, a planet carrier 10 and several planet gears 12; the sun gear shaft 23 is arranged in the inner hole on the right end cover 14 of the box body 8 through a bearing, and the two ends of the bearing pass through the convex The stage and the retaining ring are positioned at four points, and a spline is arranged on the outer end of the box body 8, which is matched with the inner hole of the hollow motor output shaft 22 through the spline; the planet carrier 10 is supported in the box body 8 through a bearing, and the bearing The two ends are positioned at four points by the boss and the retaining ring; the box body 8 is also provided with an internal gear 29, and each planetary gear 12 is respectively arranged on the pin shaft 13 at one end of the planet carrier 10 through a bearing and is connected with the internal gear 29 and the The sun gear shaft 23 at the inner side of the box body 8 is meshed, and the two ends of the bearing are positioned at four points by the retaining ring and the sleeve 24; the sun gear shaft 23 is connected with the motor output shaft 22, realizing the input of the sun gear shaft 23, the output of the planet carrier 10, and the inner gear 29 fixed.

The spur gear differential is mainly composed of sun gear I27, sun gear II26, several planetary gears I5 and planetary gear II7, the sun gear I27 and sun gear II26 are both spur gears and the modulus and number of teeth of the two wheels are Same, all planetary gears I5 and planetary gear II7 are also spur gears with the same modulus and number of teeth; the sun gear I27 is set in the inner hole on the left end cover 4 of the box body 8 through bearings, and the sun gear II26 The bearings are arranged in the inner hole of the planet carrier 10, and there is a gap between the sun gear I27 and the sun gear II26. The other end of the planet carrier 10 is also provided with several pin shafts 6, and each pin shaft 6 is evenly distributed on the planet carrier 10. Above, the planetary gear I5 and the planetary gear II7 are respectively arranged on the evenly distributed pin shaft 6 through bearings, and the two ends of the bearing are positioned at four points by the retaining ring and the sleeve 9; part of the teeth on the planetary gear I5 and the sun gear I27 Part of the teeth on the planetary gear II7 meshes with the sun gear II26, and the rest of the teeth on the adjacent planetary gears I5 and II7 mesh with each other and the meshing area is located between the gaps between the sun gears I27 and II26.

In this embodiment, the left half of the planetary gear I5 meshes with the sun gear I27, the right half of the planetary gear II7 meshes with the sun gear II26, and the right half of the planetary gear I5 meshes with the left half of the adjacent planetary gear II7 , There is a certain gap between the sun gear I27 and the sun gear II26, and the teeth of the intermeshing planetary gear I5 and planetary gear II7 are in the gap area, which can ensure that the planetary gear on one side does not conflict with the sun gear on the other side. Undercutting is produced. Sun gear I 27 and sun gear II 26 are also provided with inner holes, and splines are arranged in the inner holes, which are respectively matched with the splines at the ends of the short semi-shaft 28 and the long semi-shaft 25 to realize torque transmission; the planetary reducer The transmitted torque is transmitted to the sun gear I27 and the sun gear II26 through the planet carrier 10, the pin shaft 6, the planetary gear I5, and the planetary gear II7. The planetary gear is equivalent to an equal-arm lever, and the radius of the two sun gears is equal, so When the car runs straight on a flat ground, the planetary gear does not rotate, and the torque will be evenly distributed to the sun gear I27 and the sun gear II26.

The rear axle is mainly composed of rear bridge frame 18, wheel hub I1, wheel hub II21, short half-shaft 28 and long half-shaft 25; one end of the short half-shaft 28 is inserted in the inner hole of the sun gear I27 and connected to the sun through a spline. The wheel I27 is connected, and the other end is connected with the wheel hub I1. One end of the long half shaft 25 passes through the inner hole of the motor output shaft 22, the hollow sun gear shaft 23 and the inner hole of the sun gear II26, and then connects with the sun gear II26 through a spline. One end is connected with the wheel hub II 21; the rear bridge 18 is arranged outside the short half shaft 28 and the long half shaft 25, and the box 8 and the motor 15 are fixed on the rear bridge 18.

In this embodiment, the motor 15 is connected to the box body 8 through long bolts through holes, and the casing of the motor 15 is a casing with a water jacket, which is good for heat dissipation. The motor 15 can cooperate with the frequency conversion controller to control the speed regulation of the AC motor to realize stepless speed regulation. The output shaft 22 of the motor 15 is a hollow shaft, which is convenient for the installation of the long half shaft 25; one end of the motor output shaft 22 is provided with an internal spline, which matches with the spline on the outer end of the sun gear shaft 23 casing; the two ends of the motor output shaft 22 Supported by bearings on the left end cover 16 and the right end cover 17 of the motor, the structure is stable and reliable.

The rear axle in this embodiment also includes a shock absorber seat I3 , a shock absorber seat II19 , a pallet seat I2 and a pallet seat II20 arranged on the rear bridge frame 18 . Both hub I1 and hub II21 are equipped with brake blocks, which are used as brake drums at the same time; hub I1 and hub II21 are respectively equipped with rear wheels; shock absorber seat I3 and shock absorber seat II19 are connected to the frame through the shock absorber. The pallet seat I2 and the pallet seat II20 are connected to the vehicle frame through the pallet.

In this embodiment, a nylon gasket 11 for sealing is provided between the left end cover 4 and the right end cover 14 of the box body 8 and the box body 8 to ensure the tightness of the box body, and lubricating oil or grease is housed in the box body.

Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that it can be described in terms of form and Various changes may be made in the details without departing from the scope of the invention defined by the claims.

Claims (5)

1. a kind of electric motor car with slowing down, differential integrated driving rear axle assy, it is characterised in that：Including motor, planetary reduction gear Device, spur-gear differential, casing and back axle, the planetary reduction gear, spur-gear differential are arranged at case In body, the motor is fixed on casing side；The output shaft of the motor is hollow structure；

The planetary reduction gear it is main by hollow sun wheel shaft, planet carrier and several planetary gear sets into；The sun wheel shaft It is arranged on the right end cap of casing by bearing, spline is provided with positioned at casing outboard end, by spline and hollow motor Output shaft endoporus is engaged；The planet carrier in casing, is additionally provided with ring gear, each planetary gear point by bearings on casing Set by bearing on the bearing pin of planet carrier one end and be meshed with ring gear and sun wheel shaft positioned at box inside end；

The spur-gear differential is mainly made up of sun gear I, sun gear II, several planetary gears I and planetary gear II, The sun gear I is straight spur gear with sun gear II and two-wheeled modulus and the number of teeth are identical, the planetary gear I and planetary gear II is straight spur gear and two-wheeled modulus and the number of teeth are identical；The sun gear I is arranged on the left end cap of casing by bearing On, sun gear II is set in the endoporus of planet carrier by bearing, and gap, the row are left between sun gear I and sun gear II Star-wheel I and planetary gear II are set on the bearing pin of the planet carrier other end by bearing respectively, the part gear teeth on planetary gear I with too Sun wheel I is meshed, and the part gear teeth on planetary gear II are meshed with sun gear II, the remainder on adjacent planetary gear I, II The gear teeth are engaged with each other and region of engagement is located between the gap of sun gear I, II；

The back axle is mainly made up of rear axle stand, wheel hub I, wheel hub II, semi-minor axis and major semiaxis；Described semi-minor axis one end is inserted into It is connected with sun gear I in the endoporus of sun gear I and by spline, the other end is connected with wheel hub I, described major semiaxis one end passes through electricity It is connected with sun gear II by spline after the endoporus of motivation output shaft endoporus, hollow sun wheel shaft and sun gear II, the other end Then it is connected with wheel hub II；The rear axle stand is arranged on outside semi-minor axis and major semiaxis, and the casing is fixed on rear axle stand with motor On.

2. electric motor car according to claim 1 with slowing down, differential integrated driving rear axle assy, it is characterised in that：It is described The shell of motor carries water jacket.

3. electric motor car according to claim 1 with slowing down, differential integrated driving rear axle assy, it is characterised in that：It is described Hollow motor output shaft two ends are covered by bearings in motor terminal.

4. electric motor car according to claim 1 with slowing down, differential integrated driving rear axle assy, it is characterised in that：It is described The nylon spacer of sealing is provided between the left and right end cap and casing of casing.

5. electric motor car according to claim 4 with slowing down, differential integrated driving rear axle assy, it is characterised in that：It is described Casing is built with lubricating oil or lubricating grease.