CN214221917U - Continuously variable automatic transmission device, continuously variable automatic transmission, and motor vehicle - Google Patents
Continuously variable automatic transmission device, continuously variable automatic transmission, and motor vehicle Download PDFInfo
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- CN214221917U CN214221917U CN202022567131.1U CN202022567131U CN214221917U CN 214221917 U CN214221917 U CN 214221917U CN 202022567131 U CN202022567131 U CN 202022567131U CN 214221917 U CN214221917 U CN 214221917U
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Abstract
The utility model discloses a stepless automatic speed change device, stepless automatic speed changer and motor vehicle, including infinitely variable mechanism, infinitely variable mechanism includes second planetary gear subassembly and auxiliary drive mechanism, and the third element joint in auxiliary drive mechanism and the second planetary gear subassembly promotes the third element through auxiliary drive mechanism and rotates with the holistic drive ratio of control. When the output rotating speed of the auxiliary driving mechanism is zero, the total transmission ratio is matched according to the gear ratio of each stage to reach the maximum; when the output speed of the auxiliary driving mechanism reaches the highest, the transmission ratio is closer to 1; therefore, the utility model discloses a stepless automatic speed change device or derailleur can realize exporting the drive ratio of setting for wantonly through the rotational speed of control auxiliary drive mechanism output to realize infinitely variable, satisfied the simplification of automatic speed change device structure and control strategy, have the characteristics of high life, high efficiency, low-cost manufacturing.
Description
Technical Field
The utility model relates to an automobile power transmission system technical field, in particular to electric automobile's infinitely variable automatic gearbox, motor vehicle and motor vehicle's the method of shifting gears that contains it.
Background
Utility model patent No. CN201410446735.7 discloses a planetary gear train of an automatic transmission for a vehicle, which may include: the planetary gear set comprises an input shaft, an output shaft, a first planetary gear set, a second planetary gear set, a first rotating shaft, a second rotating shaft, a third rotating shaft and a fourth rotating shaft; the input shaft receives torque; the output shaft is arranged parallel to and spaced from the input shaft; the first planetary gear set has three rotary elements; the second planetary gear set has three rotating elements; the second rotary shaft is directly connected to the other rotary element of the second planetary gear set and directly connected to the output shaft; a third rotary shaft directly connected to the other rotary element of the first planetary gear set and the remaining rotary element of the second planetary gear set and selectively connected to the input shaft and/or selectively connected to the transmission case; the fourth rotating shaft is directly connected to the remaining rotating elements of the first planetary gear set, and is selectively connected to the input shaft through two paths and/or selectively connected to the transmission case. The first rotatable shaft is selectively connectable to the input shaft and the third rotatable shaft is selectively connectable to the input shaft and/or to the transmission housing, such as by selective engagement by way of a clutch.
The transmission needs to adopt the clutch for selective engagement, so that the whole volume of the transmission is large, the vehicle is easy to have a pause and frustration phenomenon in the gear shifting process, the structure is complex, the control strategy is complicated, the cost is high, and the reliability of the structure is low.
Most of the existing automatic transmissions for electric vehicles are step-variable transmissions, which cannot achieve the effect of stepless speed change, for example, the utility model patent No. CN201910120869.2 discloses a three-gear planetary gear automatic transmission.
In addition, although the conventional single-pole speed reducer transmission mechanism can control the output rotating speed of the speed reducer through the rotating speed of the motor, the requirement of the automatic speed changing scheme on the motor is extremely high, the motor needs to simultaneously meet the high torque during low rotating speed and also needs to meet the requirement of high rotating speed, and the operating condition cannot fully exert the high efficiency of the motor and the controller on the conventional motor, so that the body type of the motor and the controller is huge, and the energy utilization rate is low.
The stepless automatic transmission has wide application, and the complex structural process thereof can not greatly reduce the cost all the time, thereby applying more resistance to the development and marketing of the industry, and therefore, a stepless automatic transmission is needed to be designed to meet the market demand.
SUMMERY OF THE UTILITY MODEL
The utility model provides a stepless automatic speed change device and stepless automatic speed changer can solve the above-mentioned defect among the prior art.
The technical scheme of the utility model as follows:
a continuously variable automatic transmission comprising a continuously variable transmission mechanism including an improved second planetary gear assembly and an auxiliary drive mechanism for driving the second planetary gear assembly, the second planetary gear assembly comprising: the auxiliary driving mechanism comprises a first element, a second element, a third element and a fourth element, wherein the first element is connected with a power source, the second element is connected with the first element, a second rotating shaft is arranged in the axial direction of the third element, the second element and the fourth element are respectively fixedly connected to the second rotating shaft, the second element and the fourth element are respectively arranged on two sides of the third element, the fourth element is connected with an output shaft, the auxiliary driving mechanism is connected with the third element, and when the auxiliary driving mechanism drives the third element to rotate, the fourth element outputs a changed transmission ratio.
When the output rotating speed of the auxiliary driving mechanism is zero, the total transmission ratio is matched according to the gear ratio of each stage to reach the maximum; when the output rotating speed of the auxiliary driving mechanism is gradually increased, the total transmission ratio is gradually reduced, and when the output rotating speed of the auxiliary driving mechanism reaches the maximum, the transmission ratio is closer to 1. And according to the structural requirement of the speed change device, a smaller transmission ratio can be theoretically set, and the purpose can be achieved only by continuously increasing the rotating speed of the auxiliary driving mechanism. Therefore, the utility model discloses a stepless automatic speed change device can realize exporting the drive ratio of setting for wantonly through the rotational speed of control auxiliary drive mechanism output to realize infinitely variable, satisfied the simplification of automatic speed change device structure and control strategy, had the characteristics of high life, high efficiency, low-cost manufacturing.
In some embodiments, the first element comprises a second sun gear, the second element is a second planet gear, the third element is a rotating planet gear, and the fourth element is a second planet pinion, wherein the third element has external teeth and the auxiliary drive is in mesh with the external teeth of the third element. Specifically, the first element further includes a second gear shaft, the continuously variable transmission mechanism is coupled to the power source through the second gear shaft, the second planetary gear is meshed with the second sun gear, and the third element and the fourth element are respectively fixed to the second rotating shaft, so that the output rotating speeds are the same.
The utility model also provides a stepless automatic transmission, include: a fixed speed ratio mechanism for outputting a fixed gear ratio, an input end of the fixed speed ratio mechanism being drivingly connected with a drive source of a vehicle, a continuously variable transmission mechanism including at least one set of second planetary gear assemblies having a first element engaged with an output end of the fixed speed ratio mechanism, a second element, a third element, and a fourth element engaged with an output shaft; and, the continuously variable transmission mechanism further includes an auxiliary drive mechanism engaged with the third element to cause the fourth element to output a modified gear ratio when the auxiliary drive mechanism drives the third element to rotate.
The utility model discloses a stepless automatic transmission, fixed speed ratio mechanism output fixed drive ratio realizes the one-level speed reduction, and stepless speed change mechanism realizes the second grade speed reduction, through bipolar speed change scheme, can reduce automatic transmission's whole volume to the space that the vehicle can utilize has been improved. The utility model discloses a rotational speed of control auxiliary drive mechanism output can realize exporting the drive ratio of setting for wantonly to realize infinitely variable, satisfied the simplification of automatic transmission structure and control strategy, had the characteristics of high life, high efficiency, low-cost manufacturing.
Preferably, supplementary actuating mechanism is a pair and drives the motor, vice output shaft that drives the motor with the external tooth meshing of the third component is connected, vice motor output different rotational speed of driving, thereby make the whole different drive ratios of output of derailleur can realize controlling holistic drive ratio through vice rotational speed control who drives the motor, consequently the utility model discloses a control strategy of derailleur is simpler.
In some embodiments, the fixed speed ratio mechanism includes at least one set of first planetary gear assemblies having a first rotating member, a second rotating member, a third rotating member, and a fixed carrier fixed, the fixed carrier is provided with a first rotating shaft in an axial direction, the second rotating member and the third rotating member are respectively fixed to the first rotating shaft, the second rotating member and the third rotating member are respectively provided on both sides of the fixed carrier, and the rotating speeds of the second rotating member and the third rotating member are the same.
Preferably, the first rotating member is a first sun gear, the second rotating member is a first planet gear, the third rotating member is a first planet pinion, the first planet pinion is an output end of a fixed speed ratio mechanism, and external teeth of the first planet pinion are engaged with the first element.
Further, the first rotating member is fixed to a first gear shaft, the first gear shaft is connected to an output end of the power source, and the first rotating shaft is press-fitted to the fixing bracket through a bearing. The fixed bracket is fixed to the shell of the speed changer through a fixed bolt to prevent the rotation of the fixed bracket from influencing the transmission ratio,
further, the first element includes a second sun gear, the second element is a second planet gear, the third element is a rotating planet gear, and the fourth element is a second planet pinion, wherein a second rotating shaft is axially arranged on the third element, the second element and the fourth element are fixed on the second rotating shaft, the second element and the fourth element are respectively arranged on two sides of the third element, and the rotating speeds of the second element and the fourth element are the same. The third element has external teeth, and the external teeth of the third element are meshed with the external teeth at the output end of the auxiliary driving mechanism.
Preferably, the first element further includes a second gear shaft, the second sun gear is fixed to the second gear shaft, a second external gear is disposed at an end of the second gear shaft, a second assembling groove is further formed at an end of the second gear shaft, a bearing is press-fitted in the second assembling groove, the gear shaft of the fixed speed ratio mechanism is press-fitted into the second assembling groove through the bearing, and the second external gear of the second gear shaft is made to engage with the output end of the fixed speed ratio mechanism. Specifically, the second fitting groove of the end portion of the second gear shaft is press-fitted with the end portion of the first gear shaft, and the second external gear is engaged with the third rotating member.
Preferably, the end portion of the output shaft is provided with a first external gear and a first fitting groove, a bearing is press-fitted into the first fitting groove, the other end portion of the second gear shaft is press-fitted into the first fitting groove through the bearing, and the first external gear at the end portion of the output shaft is engaged with the fourth element.
The holistic structure of fixed speed ratio mechanism, the holistic structure of infinitely variable speed mechanism and fixed speed ratio mechanism, the connection structure between the infinitely variable speed mechanism have reduced the whole volume of derailleur, make the utility model discloses a continuously variable automatic transmission has the advantage that the size is little, and connects through gear engagement and make the utility model discloses a transmission is smooth-going, and the operation is stable, through motor drive gear's mode for the stability of life-span, manufacturing cost and the operation of derailleur is all more excellent.
The utility model also provides a motor vehicle who contains arbitrary stepless automatic speed change device or as above arbitrary stepless automatic speed change device.
Compared with the prior art, the beneficial effects of the utility model are as follows:
first, when the output rotation speed of the auxiliary driving mechanism is zero, the total transmission ratio is matched according to the gear ratio of each stage, and reaches the maximum; when the output rotating speed of the auxiliary driving mechanism is gradually increased, the total transmission ratio is gradually reduced, and when the output rotating speed of the auxiliary driving mechanism reaches the highest value, the transmission ratio is closer to 1; according to the structural requirement of the speed change device, a smaller transmission ratio can be theoretically set, and the purpose can be achieved only by continuously increasing the rotating speed of the auxiliary driving mechanism; therefore, the utility model discloses a stepless automatic speed change device or derailleur can realize exporting the drive ratio of setting for wantonly through the rotational speed of control auxiliary drive mechanism output to realize infinitely variable, satisfied the simplification of automatic speed change device structure and control strategy, have the characteristics of high life, high efficiency, low-cost manufacturing.
Secondly, the stepless automatic speed changing device or the stepless automatic speed changer of the utility model achieves the transmission ratio between the output end of the control power source and the output shaft by controlling the rotating speed of the third element in the second planetary gear assembly, thereby realizing the high torque at the low rotating speed of the vehicle, controlling the low rotating speed operation of the third element to obtain the high transmission ratio, and controlling the high rotating speed operation of the third element simultaneously when the vehicle is operated at the high rotating speed, thereby improving the rotating speed of the output shaft; make the utility model discloses a continuously variable automatic transmission's control strategy is simpler.
Thirdly, the stepless automatic transmission of the utility model completes the first-stage speed reduction through the fixed speed ratio mechanism, completes the second-stage speed reduction through the stepless speed change mechanism, adopts the bipolar speed change scheme, not only can achieve the effect of stepless speed change, but also reduces the whole volume of the automatic transmission; specifically, the whole structure of the fixed speed ratio mechanism, the whole structure of the stepless speed change mechanism and the connection structure between the fixed speed ratio mechanism and the stepless speed change mechanism lead the whole structure of the transmission to be compact, and the whole volume of the transmission is reduced, thus leading the stepless automatic transmission of the utility model to have the advantages of compact structure and small size; through the mode of motor drive gear for the life-span, manufacturing cost and the stability of operation of derailleur are all more excellent, more are fit for the market application of mass.
Fourth, the utility model discloses a motor vehicle need not adopt traditional hydraulic pressure to shift gears, and transmission efficiency is higher, has shortened the shift time, has improved the quality of shifting, accords with car lightweight principle.
Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.
Drawings
Fig. 1 is a schematic cross-sectional view of a continuously variable automatic transmission according to embodiment 1 of the present invention;
fig. 2 is a partial schematic structural view of a continuously variable automatic transmission according to embodiment 2 of the present invention;
fig. 3 is a schematic cross-sectional structural view of a continuously variable automatic transmission according to embodiment 2 of the present invention;
fig. 4 is a schematic structural view of a first element of a continuously variable automatic transmission according to embodiment 2 of the present invention;
fig. 5 is a front view of a continuously variable automatic transmission according to embodiment 2 of the present invention.
Reference numerals: a first rotating member 101; a second rotating member 102; a third rotating member 103; a fixed bracket 104; a first rotation shaft 105; a first gear shaft 106; the continuously variable transmission mechanism 200; a first element 201; a second element 202; a third element 203; a fourth element 204; a second rotation shaft 205; a second gear shaft 206; a second external gear 208; a second fitting groove 209; the auxiliary drive mechanism 210; an output shaft 30; a first external gear 301; a first fitting groove 302; a housing 400.
Detailed Description
In the description of the present invention, it should be noted that the "vehicle" or "motor vehicle" is a new fuel cell vehicle, such as an electric vehicle, a hydrogen fuel cell vehicle, and the like. The "transmission" is also recorded as an "automatic transmission", which is the stepless automatic transmission of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "coupled" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As used in this specification, the singular forms "a," "an," and "the" include plural referents unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise.
The present invention will be further described with reference to the following specific examples.
Example 1
The present embodiment provides a continuously variable automatic transmission, referring to fig. 1, which is a schematic sectional view of the automatic transmission of the present embodiment, wherein the continuously variable automatic transmission includes a continuously variable transmission mechanism including a modified second planetary gear assembly and an auxiliary drive mechanism 210 for driving the second planetary gear assembly, and the second planetary gear assembly 200 includes: the driving device comprises a first element 201, a second element 202, a third element 203 and a fourth element 204, wherein the first element 201 is connected with a power source, the second element 202 is connected with the first element 201, a second rotating shaft 205 is arranged in the axial direction of the third element 203, the second element 202 and the fourth element 204 are respectively fixedly connected to the second rotating shaft 205, the second element 202 and the fourth element 204 are respectively arranged on two sides of the third element 203, the fourth element 204 is connected with an output shaft, an auxiliary driving mechanism 210 is connected with the third element 203, and when the auxiliary driving mechanism 210 drives the third element 203 to rotate, the fourth element 204 outputs a changed transmission ratio.
Further, the first element 201 comprises a second sun gear, the second element 202 is a second planet gear, the third element 203 is a rotating planet, and the fourth element 204 is a second planet pinion, wherein the third element 203 has external teeth. Unlike the conventional planetary gear structure (the ring gear employs an internal gear), the rotating planetary gear of the present embodiment employs an external gear structure, and the auxiliary drive mechanism 210 is engaged with the external teeth of the third element 203.
In the present embodiment, the fourth element 204 corresponds to the second element 202 one by one, wherein the external teeth of the fourth element 204 are engaged with the external teeth of the output shaft in the circumferential direction. Specifically, the first element 201 further includes a second gear shaft 206, the second sun gear is fixed on the second gear shaft 206, the rotating planetary gear is press-fitted on the second gear shaft 206 through a bearing, the second rotating shaft 205 is press-fitted to an axial direction of the rotating planetary gear through a bearing, and the second planetary gear and the second planetary pinion are respectively fixed at two ends of the second rotating shaft 205 in an interference fit manner, so that the rotating speeds of the second element 202 and the fourth element 204 are the same.
The auxiliary driving mechanism 210 of the present embodiment is a secondary driving motor, the rotation direction of the secondary driving motor is the same as the output direction of the driving source, and the output transmission ratio is controlled by controlling the rotation speed of the auxiliary driving mechanism 210. Specifically, when the rotating speed of the auxiliary drive motor is zero, the total transmission ratio is matched according to the gear ratio of each stage to reach the maximum; and the higher the speed of the secondary drive motor, the closer the ratio will be to 1. According to the structural requirements, a smaller transmission ratio can be theoretically set, and only the rotating speed of the auxiliary driving motor needs to be continuously increased.
The automatic speed changing device can output continuous transmission ratio by controlling the output rotating speed of the auxiliary driving motor to achieve the purpose of stepless speed regulation, and is more stable in gear shifting and free of pause and contusion compared with the existing transmission adopting a clutch to shift gears. The control strategy of the automatic speed changing device is simpler, and the automatic speed changing device has the characteristics of long service life, high efficiency and low manufacturing cost.
Example 2
The present embodiment provides a continuously variable automatic transmission, referring to fig. 2 to 5, which is a schematic structural diagram of the continuously variable automatic transmission of the present embodiment, and the continuously variable automatic transmission includes a fixed speed ratio mechanism and a continuously variable transmission mechanism 200: wherein the fixed ratio mechanism is drivingly connected to a drive source of the vehicle for outputting a fixed transmission ratio; the continuously variable transmission mechanism 200 includes at least one set of second planetary gear assemblies having a first element 201, a second element 202, a third element 203, and a fourth element 204, the first element 201 being engaged with the output end of the fixed ratio mechanism, the fourth element 204 being engaged with the output shaft 30; the continuously variable transmission mechanism 200 further includes an auxiliary drive mechanism 210, the auxiliary drive mechanism 210 is engaged with the third element 203, and the fourth element 204 outputs a changed gear ratio when the auxiliary drive mechanism 210 drives the third element 203 to rotate.
Specifically, the driving source of this embodiment is a main drive motor assembly, the input of the fixed speed ratio mechanism is connected with the output of the main drive motor assembly through a coupler, the main drive motor assembly drives to input driving power, and the output shaft is connected with the wheel drive. The auxiliary driving mechanism 210 of this embodiment is a secondary driving motor, the rotation direction of the secondary driving motor is the same as the rotation direction of the output end of the primary driving motor, and the output end of the secondary driving motor has external teeth, so that the auxiliary driving mechanism 210 is engaged with the external teeth of the third element 203 through the external teeth to drive the third element 203 in the second planetary gear assembly to rotate, thereby outputting different transmission ratios by controlling the secondary driving motor to output different rotation speeds.
When the rotating speed of the auxiliary drive motor is zero, the total transmission ratio is matched according to the gear ratio of each stage to reach the maximum; and the higher the speed of the secondary drive motor, the closer the ratio will be to 1. According to the structural requirement, a smaller transmission ratio can be theoretically set, and only the rotating speed of the auxiliary driving motor needs to be continuously increased, so that the continuously variable transmission of the embodiment can output the continuously variable transmission ratio, and the effect of stepless speed regulation is achieved. Specifically, in the starting stage of the vehicle, under the working condition of low rotating speed and large torque, the high transmission ratio is obtained by controlling the low rotating speed operation of the rotating planet wheel, and under the normal running state of the vehicle, the rotating planet wheel is controlled to simultaneously operate at high rotating speed, so that the rotating speed of the output shaft is improved. When the reverse gear is performed, the rotating speed of the auxiliary drive motor is zero, and the main drive motor assembly is controlled to rotate reversely.
The automatic transmission of the embodiment replaces the traditional hydraulic gear shifting structure, and the service life, the manufacturing cost and the structural reliability of the motor (the main drive motor assembly and the auxiliary drive motor) and each gear are all more excellent than those of a hydraulic mode, so that the stepless automatic transmission of the embodiment is more suitable for mass market application. In addition, because a clutch is not needed for gear shifting, and only speed information is needed to be acquired during gear shifting, and the preset transmission ratio can be output by controlling the rotating speed of the auxiliary driving motor, compared with the prior art, the control strategy of the automatic transmission is simpler; in addition, the automatic transmission for shifting gears by controlling the rotating speed of the auxiliary driving motor is smoother in gear shifting, the phenomenon of pause and frustration can not occur, and the comfort is improved.
Further, the fixed speed ratio mechanism of the present embodiment outputs a fixed transmission ratio, the fixed speed ratio mechanism includes a first planetary gear assembly having a first rotating member 101, a second rotating member 102, a third rotating member 103 and a fixed bracket 104, the fixed bracket 104 is fixed, and a first rotating shaft 105 is axially disposed on the fixed bracket 104, the second rotating member 102 and the third rotating member 103 are respectively fixed to two ends of the first rotating shaft 105, and the second rotating member 102 and the third rotating member 103 are respectively disposed on two sides of the fixed bracket 104.
Further, the first rotating member 101 is a first sun gear, the second rotating member 102 is a first planetary gear, the second rotating member 102 is engaged with the first rotating member 101 in the circumferential direction, and the third rotating member 103 is a first planetary pinion. The first rotating shaft 105 is press-fitted in the axial direction of the fixed bracket 104 through a bearing, and the second rotating member 102 and the third rotating member 103 are fixed at both ends of the first rotating shaft 105 by interference fit, respectively, so that the rotating speeds of the second rotating member 102 and the third rotating member 103 are the same.
Specifically, the first planetary gear assembly includes a first gear shaft 106, the first sun gear is fixed to the first gear shaft 106, and the fixing bracket 104 is press-fitted on the first gear shaft 106 by a bearing and fixed by a fixing bolt to prevent the fixing bracket 104 from rotating, affecting the transmission ratio. Specifically, the fixing bracket 104 is fixed to the inside of the transmission case 400 by fixing bolts. The first gear shaft 106 is an input end of the fixed speed ratio mechanism, an end portion of the first gear shaft 106 is connected with an output end of the main drive motor assembly through a coupler, the third rotating member 103 is an output end of the fixed speed ratio mechanism, and the third rotating member 103 is connected with an input end, namely a first element, of the second planetary gear assembly at the rear end.
Further, referring to fig. 2 to 5, in the second planetary gear assembly, the first element 201 includes a second sun gear, the second element 202 is a second planet gear, the third element 203 is a rotating planet gear, and the fourth element 204 is a second planet pinion. The first element 201 is engaged with the second element 202, the third element 203 is axially provided with a second rotating shaft 205, the second element 202 and the fourth element 204 are fixed on the second rotating shaft 205, the second element 202 and the fourth element 204 are respectively arranged on two sides of the third element 203, and external teeth of the fourth element 204 are engaged with external teeth of the output shaft 30.
Specifically, the first element 201 further includes a second gear shaft 206, the second sun gear is fixed on the second gear shaft 206, one end of the second gear shaft 206 is provided with a second external gear 208, the end of the second gear shaft 206 is further formed with a second assembling groove 209, a bearing is pressed in the second assembling groove 209, and the gear shaft (the first gear shaft 106) of the fixed speed ratio mechanism is pressed into the second assembling groove 209 through the bearing, so that the fixed speed ratio mechanism is fixed in the housing 400 of the automatic transmission, and the second external gear 208 at the end of the second gear shaft 206 is engaged with the output end of the fixed speed ratio mechanism, that is, the second external gear 208 is engaged with the external teeth of the third rotating member 103.
The third element 203 of the present embodiment employs a structure of an external gear, unlike a structure in which a ring gear employs an internal gear in a conventional planetary gear. Specifically, the third element 203 is press-fitted to the second gear shaft 206 by a bearing, the second rotating shaft 205 is press-fitted to the axial direction of the third element 203 by a bearing, and the second element 202 and the fourth element 204 are fixed to both end portions of the second rotating shaft 205 by interference fit, so that the rotating speeds of both the second element 202 and the fourth element 204 are the same.
In this embodiment, the first external gear 301 and the first mounting groove 302 are formed at the head end of the output shaft 30, a bearing is press-fitted into the first mounting groove 302, and the other end portion of the second gear shaft 206 is press-fitted into the first mounting groove 302 through the bearing, so that the second planetary gear assembly is fixed in the housing 400 of the automatic transmission, and the first external gear 301 at the head end of the output shaft 30 is engaged with the fourth element 204.
In this embodiment, the fixed speed ratio mechanism and the continuously variable transmission mechanism 200 are respectively installed in the casing 400 of the transmission, the first gear shaft 106 and the output shaft 30 of the first planetary gear assembly are respectively fixed in the casing 400 through bearings, the external gear of the output end of the secondary drive motor is fixed in the casing 400, and the body of the secondary drive motor is located outside the casing 400.
In the embodiment, the scheme of double-pole speed change of the fixed speed ratio mechanism and the continuously variable transmission mechanism 200 is adopted, so that the overall size of the transmission is reduced, and in addition, the structures of the second rotating member 102 and the third rotating member 103 in the first planetary gear assembly, the joint of the third rotating member 103 and the second gear shaft 206 in the second planetary gear assembly and the structures of the second element 202 and the fourth element 204 are adopted, so that the overall structure of the automatic transmission of the embodiment is more compact, the overall size is further reduced, and the automatic transmission has the characteristics of long service life, high efficiency and low cost in manufacturing.
The stepless speed changer is widely applied, and the cost of the stepless speed changer cannot be greatly reduced due to the complex structural process, so that the stepless speed changer applies more resistance to the development and marketing of the industry. The stepless automatic transmission of the embodiment has the advantages of simple structure, small size, low cost and low failure rate, and can solve the pain point of the market.
While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the present invention is not to be limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims. The present invention is limited only by the claims and their full scope and equivalents.
Obviously, many modifications and variations are possible in light of the above teaching, and it is contemplated that modifications and variations of the present invention will suggest themselves to those skilled in the art, while still falling within the scope of the present invention. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated and as may be made by those skilled in the art without departing from the scope and spirit of the invention as defined by the appended claims.
Claims (11)
1. A continuously variable automatic transmission comprising a continuously variable transmission mechanism including an improved second planetary gear assembly and an auxiliary drive mechanism for driving the second planetary gear assembly, the second planetary gear assembly comprising: a first element, a second element, a third element and a fourth element, wherein the first element is connected with a power source, the second element is connected with the first element, a second rotating shaft is arranged in the axial direction of the third element, the second element and the fourth element are respectively fixedly connected to the second rotating shaft, the second element and the fourth element are respectively arranged on two sides of the third element, and the fourth element is connected with an output shaft,
the auxiliary drive mechanism is engaged with the third element and causes the fourth element to output a modified gear ratio when the auxiliary drive mechanism drives the third element to rotate.
2. The continuously variable automatic transmission of claim 1, wherein the first element comprises a second sun gear, the second element is a second planetary gear, the third element is a rotating planet gear, the fourth element is a second planetary pinion, and the second sun gear is coupled to a power source via a gear shaft, wherein the third element has external teeth and the auxiliary drive mechanism is in mesh with the external teeth of the third element.
3. A continuously variable automatic transmission, comprising:
the fixed speed ratio mechanism is used for outputting a fixed transmission ratio, the input end of the fixed speed ratio mechanism is in driving connection with a driving source of the vehicle,
a continuously variable transmission mechanism including at least one set of second planetary gear assemblies having a first element engaged with the output of the fixed ratio mechanism, a second element, a third element, and a fourth element engaged with the output shaft;
and, the continuously variable transmission mechanism further includes an auxiliary drive mechanism engaged with the third element, the fourth element outputting a modified gear ratio when the auxiliary drive mechanism drives the third element to rotate.
4. A continuously variable automatic transmission according to claim 3, wherein the auxiliary drive mechanism is a secondary drive motor, an output end of the secondary drive motor is connected with the external teeth of the third element in a meshing manner, and the secondary drive motor outputs different rotating speeds, so that the transmission as a whole outputs different transmission ratios.
5. The continuously variable automatic transmission according to claim 3, wherein the fixed speed ratio mechanism includes at least one set of a first planetary gear assembly having a first rotating member, a second rotating member, a third rotating member, and a fixed carrier fixed, the fixed carrier having a first rotating shaft provided in an axial direction thereof, the second rotating member and the third rotating member being fixed to the first rotating shaft, respectively, and the second rotating member and the third rotating member being provided on both sides of the fixed carrier.
6. The continuously variable automatic transmission of claim 5, wherein the first rotating member is a first sun gear, the second rotating member is a first planet gear, the third rotating member is a first planet pinion, and external teeth of the first planet pinion are engaged with the first element.
7. The continuously variable automatic transmission according to claim 5, wherein the first rotating member is fixed to a first gear shaft connected to an output end of a power source, and the first rotating shaft is press-fitted to the fixed bracket through a bearing.
8. A continuously variable automatic transmission according to claim 3, wherein said first element includes a second sun gear, said second element is a second planetary gear, said third element is a rotating planetary gear, and said fourth element is a second planetary pinion, wherein a second rotating shaft is provided in an axial direction of said third element, said second element and said fourth element are fixed to said second rotating shaft, and said second element and said fourth element are provided on both sides of said third element.
9. The continuously variable automatic transmission according to claim 8, characterized in that the first element further comprises a second gear shaft to which the second sun gear is fixed, an end of the second gear shaft being provided with a second external gear,
and a second assembling groove is formed at the end part of the second gear shaft, a bearing is pressed in the second assembling groove, the gear shaft of the fixed speed ratio mechanism is pressed in the second assembling groove through the bearing, and the second external gear of the second gear shaft is enabled to be jointed with the output end of the fixed speed ratio mechanism.
10. The continuously variable automatic transmission according to claim 9, wherein an end portion of the output shaft is provided with a first external gear and a first fitting groove, a bearing is press-fitted into the first fitting groove, the other end portion of the second gear shaft is press-fitted into the first fitting groove through the bearing, and the first external gear of the end portion of the output shaft is engaged with the fourth element.
11. A motor vehicle comprising a continuously variable automatic transmission according to claim 1 or 2 or comprising a continuously variable automatic transmission according to any one of claims 3 to 10.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN112228520A (en) * | 2020-11-09 | 2021-01-15 | 浙江恒友机电有限公司 | Continuously variable automatic transmission, continuously variable automatic transmission and motor vehicle |
CN115432102A (en) * | 2022-10-08 | 2022-12-06 | 八方电气(苏州)股份有限公司 | Continuously variable transmission mechanism, transmission hub and vehicle |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112228520A (en) * | 2020-11-09 | 2021-01-15 | 浙江恒友机电有限公司 | Continuously variable automatic transmission, continuously variable automatic transmission and motor vehicle |
CN115432102A (en) * | 2022-10-08 | 2022-12-06 | 八方电气(苏州)股份有限公司 | Continuously variable transmission mechanism, transmission hub and vehicle |
CN115432102B (en) * | 2022-10-08 | 2023-08-04 | 八方电气(苏州)股份有限公司 | Continuously variable transmission mechanism, speed change hub and vehicle |
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