Planetary gear set of hybrid vehicle driving device and hybrid vehicle driving device
Technical Field
The invention relates to the technical field of vehicle driving devices, in particular to a planetary gear of a hybrid vehicle driving device and the hybrid vehicle driving device.
Background
The main technology in the field of the current hybrid power vehicle driving device represents a Toyota THS system and a Honda i-MMD system, the Toyota THS system adopts a planetary row to realize power coupling and power splitting and further realize series and parallel series-parallel connection modes, the Toyota I-MMD system adopts a clutch device to realize series and parallel connection switching, the configurations of the hybrid power driving devices of other manufacturers are mostly based on the two technologies, and meanwhile, due to the technical protection and the barrier of the planetary row, the configurations similar to the Honda i-MMD system are mostly adopted in the market at present. With the development of technology and the upgrading of consumption, higher requirements are put forward on the fuel efficiency and the dynamic property of hybrid power, and enterprises seek schemes with better fuel saving effect and dynamic property.
In the series-parallel scheme, the rotating speed from the engine to the wheel end or the rotating speed of the generator is a fixed speed ratio, and the stepless regulation cannot be realized, so that the optimal fuel economy cannot be exerted, and the planet row power splitting scheme has inherent advantages.
The existing planet row power splitting scheme adopts a single Simpson planet row and comprises a first motor, a second motor, an engine, a shock absorber, a planet row, an intermediate shaft and a differential device, wherein the planet row comprises a sun gear, a planet carrier and an inner gear ring. The first motor is connected with the sun gear of the planet row, the engine is connected to the planet carrier of the planet row through the shock absorber, and the driven wheel of the intermediate shaft is meshed with the external teeth of the inner gear ring and the input gear of the second motor. The principle of the hybrid power vehicle driving device is that the power of an engine is divided into two paths of a sun gear and an inner gear ring through a planet row and is respectively supplied to a first motor and a middle shaft, the first motor generates electricity and transmits the electricity to a second motor, the outer teeth of the inner gear ring and the input gear of the output shaft of the second motor are both meshed with a driven wheel on the middle shaft, a driving wheel on the middle shaft is meshed with a differential device, and then the power of the engine is used twice to drive a vehicle, so that the oil-electricity hybrid power driving vehicle can run.
And analyzing the motion and the moment of the planet row to obtain a rotating speed characteristic equation and a torque characteristic equation.
nMG1+knOUT-(1+k)nICE=0
In the formula: n isMG1、nOUT、nICE、MMG1、MOUT、MICE、k、z631、z61The first motor rotating speed, the inner gear ring rotating speed, the engine rotating speed, the first motor torque, the inner gear ring torque, the engine torque, the planet row characteristic parameters, the tooth number of the inner teeth of the inner gear ring and the tooth number of the sun gear are respectively set.
However, in the case of the current radial dimensions of the planetary line, changing the characteristic parameter k of the planetary line as required to match different engines and first electric motors requires increasing the overall dimensions of the planetary line, for example: increasing the characteristic parameters requires increasing the outer diameter of the inner gear ring, and decreasing the characteristic parameters requires decreasing the size of the planet gear, but the planet gear cannot be infinitely reduced in size due to the sizes of a planet gear shaft and a bearing of the planet gear, and the outer diameter of the inner gear ring is increased. The existing hybrid vehicle drive device and the planetary row of the hybrid vehicle drive device cannot realize better fuel economy or power performance under the radial size of the current planetary row.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a planet row of a hybrid vehicle driving device and the hybrid vehicle driving device.
A planet row of a hybrid vehicle driving device comprises a sun gear, a planet carrier, an inner gear ring and at least one planet gear shaft, wherein a circle of external teeth is arranged on the outer circumferential wall of the inner gear ring, a circle of internal teeth is arranged on the inner circumferential wall of the inner gear ring, the planet gear shaft is connected with the planet carrier, a first planet gear and a second planet gear are rotatably arranged on the planet gear shaft, the first planet gear is only meshed with the sun gear, and the second planet gear is only meshed with the internal teeth. According to the technical scheme, the first planet wheel and the second planet wheel are rotatably arranged on the planet wheel shaft, the first planet wheel is only meshed with the sun wheel, and the second planet wheel is only meshed with the inner teeth.
Preferably, the planet gear shafts are provided in three or four.
Preferably, the inner circumferential walls of the first planet wheel and the second planet wheel are connected with bearings, and the bearings are fixed on the planet gear shaft to realize that the first planet wheel and the second planet wheel are rotatably arranged on the planet gear shaft.
A hybrid vehicle driving device comprises an engine, a first motor, a second motor, an intermediate shaft and a planet row, wherein an output shaft of the engine is connected with a planet carrier, an output shaft of the first motor is connected with a rotating shaft of a sun gear, and the output shaft of the engine, the planet carrier, the sun gear and the output shaft of the first motor are coaxially arranged; the first motor is connected with the second motor, and an output shaft of the second motor is connected with an input gear; the intermediate shaft is provided with a driving wheel and a driven wheel, and the driven wheel is simultaneously meshed with the external teeth and the input gear. In the technical scheme, the newly designed planet row is used for replacing the original planet row, and the rotation speed characteristic equation and the torque characteristic equation of the new planet row can be obtained by analyzing the motion and the moment of the new planet row as follows:
nMG1+knOUT-(1+k)nICE=0
in the formula: n isMG1、nOUT、nICE、MMG1、MOUT、MICE、k、z631、z61、z621、z622The first motor rotating speed, the inner gear ring rotating speed, the engine rotating speed, the first motor torque, the inner gear ring torque,Engine torque, planet row characteristic parameters, the number of teeth of the inner gear ring, the number of teeth of the sun gear, the number of teeth of the first planet gear and the number of teeth of the second planet gear.
Compared with the known power splitting technology of the planet row, the obtained rotating speed characteristic equation is consistent with the torque characteristic equation in type, and the characteristic parameters of the planet row are analyzed in a distinguishing way as follows: suppose z631、z61、z622The number of the rows of teeth is equal to that of the known existing planet rows, and is respectively 78, 30 and 23. Then the characteristic value of the planet row in the prior art is 2.6, and the rotational speed characteristic equation and the torque characteristic equation of the planet row can be obtained as follows:
nMG1+2.6nOUT-3.6nICE=0
the invention is achieved by reacting z621When the characteristic value of the planetary line is 2.94, i.e. the characteristic value of the planetary line can be increased without changing the radial dimension, the rotational speed characteristic equation and the torque characteristic equation of the planetary line can be obtained as follows:
nMG1+2.94nOUT-3.94nICE=0
simultaneously can be obtained by reacting z621If 20, the characteristic value of the planetary row is 2.26, i.e. if the characteristic value of the planetary row is reduced without changing the radial dimension, the rotational speed characteristic equation and the torque characteristic equation of the planetary row are obtained as follows:
nMG1+2.26nOUT-3.26nICE=0
in summary, according to the technical scheme, on the premise that the radial size of the existing planet row is not changed, the characteristic parameters of the planet row can be increased or decreased, and better fuel economy or power performance is achieved.
Preferably, still include the bumper shock absorber, the bumper shock absorber sets up between planet carrier and engine, and the bumper shock absorber and planet carrier and engine output shaft coaxial setting, the bumper shock absorber and engine output shaft integrative rotatory. Set up the bumper shock absorber among this technical scheme and carry out the vehicle, make the vehicle go steadily.
Preferably, the storage battery pack further comprises a storage battery pack, the first motor is connected with the storage battery pack, the first motor rotates to supply power to the storage battery pack, the second motor is connected with the storage battery pack, and the storage battery pack supplies power to the second motor.
Preferably, the output shaft of the second electric motor is parallel to the output shaft of the first electric motor.
The invention has the beneficial effects that: according to the technical scheme, the first planet wheel and the second planet wheel are rotatably arranged on the planet wheel shaft, the first planet wheel is only meshed with the sun wheel, and the second planet wheel is only meshed with the inner teeth.
A hybrid vehicle driving device comprises an engine, a first motor, a second motor, an intermediate shaft and a differential device, wherein an output shaft of the engine is connected with a planet carrier, an output shaft of the first motor is connected with a rotating shaft of a sun gear, and the output shaft of the engine, the planet carrier, the sun gear and the output shaft of the first motor are coaxially arranged; the first motor is connected with the second motor, and an output shaft of the second motor is connected with an input gear; the intermediate shaft is provided with a driving wheel and a driven wheel, and the driven wheel is simultaneously meshed with the external teeth and the input gear. According to the technical scheme, the characteristic parameters of the planet row can be increased or reduced by changing the structure of the planet row on the premise of not changing the radial size of the existing planet row, so that better fuel economy or power performance is realized, in other words, under the same characteristic parameters of the planet row, the technology provided by the invention can realize smaller radial size of the planet row.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic view of a planetary gear set of the present invention;
fig. 2 is a schematic structural view of a hybrid vehicle drive apparatus of the invention.
In the figure, 2-first motor, 3-second motor, 4-engine, 5-shock absorber, 6-planetary row, 8-intermediate shaft, 9-differential, 10-wheel, 31-input gear, 61-sun gear, 62-planet carrier, 63-ring gear, 81-driven wheel, 82-driving wheel, 621-first planet wheel, 622-second planet wheel, 631-internal tooth, 632-external tooth.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
Example 1
As shown in fig. 1, the planetary gear set comprises a sun gear 61, a planet carrier 62, an inner gear 63 and at least one planetary gear shaft, wherein a circle of external teeth 632 is arranged on the outer circumferential wall of the inner gear 63, a circle of internal teeth 631 is arranged on the inner circumferential wall of the inner gear 63, the planetary gear shaft is connected with the planet carrier 62, a first planetary gear 621 and a second planetary gear 622 are rotatably arranged on the planetary gear shaft, the first planetary gear 621 is only engaged with the sun gear 61, and the second planetary gear 622 is only engaged with the internal teeth 631. In the present embodiment, the number of the planet gear shafts is three or four, preferably three. In this embodiment, the inner circumferential walls of the first planet gear 621 and the second planet gear 622 are both connected with bearings, and the bearings are fixed on the planet gear shaft, so that the first planet gear 621 and the second planet gear 622 are rotatably arranged on the planet gear shaft.
Example 2
As shown in fig. 2, the present embodiment is further defined on the basis of embodiment 1: the hybrid power generation device comprises an engine 4, a first motor 2, a second motor 3, an intermediate shaft 8 and a planet row 6, wherein an output shaft of the engine 4 is connected with a planet carrier 62, an output shaft of the first motor 2 is connected with a rotating shaft of a sun gear 61, and the output shaft of the engine 4, the planet carrier 62, the sun gear 61 and the output shaft of the first motor 2 are coaxially arranged; the first motor 2 is connected with the second motor 3, and an output shaft of the second motor 3 is connected with an input gear 31; the intermediate shaft 8 is provided with a driving wheel 81 and a driven wheel 82, the driven wheel 82 is simultaneously meshed with the external teeth 632 and the input gear 31, and the driving wheel 81 is meshed with the differential device 9 in the embodiment. In order to damp the device, the present embodiment further includes a damper 5, where the damper 5 is disposed between the carrier 62 and the engine 4, the damper 5 is disposed coaxially with the carrier 62 and the output shaft of the engine 4, and the damper 5 and the output shaft of the engine 4 rotate integrally. In this embodiment, the power of the engine 4 is divided into two paths, namely the sun gear 61 and the ring gear 63, through the planetary gear set 6 and is respectively supplied to the first motor 2 and the intermediate shaft 8, the engine 4 rotates to drive the planet carrier 62 to rotate and further drive the first planet gear 621 to drive the sun gear 61 to rotate and drive the first motor 2 to generate power and transmit the power to the second motor 3, the planet carrier 62 rotates to drive the second planet gear 622 to rotate and further drive the ring gear 63 to rotate, the external teeth 632 of the ring gear 63 and the input gear 31 of the output shaft of the second motor 3 are both engaged with the driven wheel 82 on the intermediate shaft 8, the driving wheel 81 on the intermediate shaft 8 is engaged with the differential device 9, and then the power of the engine 4 is used twice to. The storage battery pack is further included in the embodiment, the first motor 2 is connected with the storage battery pack, the first motor rotates to supply power to the storage battery pack, the second motor 3 is connected with the storage battery pack, and the storage battery pack supplies power to the second motor 3. In the present embodiment, the output shaft of the second electric motor 3 is parallel to the output shaft of the first electric motor 2. In the present embodiment, the differential device 9 is arranged in parallel with the first electric motor 2.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.