CN113700821B - Longitudinally-arranged stepless speed changer - Google Patents
Longitudinally-arranged stepless speed changer Download PDFInfo
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- CN113700821B CN113700821B CN202111044952.XA CN202111044952A CN113700821B CN 113700821 B CN113700821 B CN 113700821B CN 202111044952 A CN202111044952 A CN 202111044952A CN 113700821 B CN113700821 B CN 113700821B
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- 230000005540 biological transmission Effects 0.000 claims abstract description 120
- 230000007246 mechanism Effects 0.000 claims abstract description 92
- 230000009467 reduction Effects 0.000 claims abstract description 62
- 230000008859 change Effects 0.000 claims abstract description 51
- 238000013016 damping Methods 0.000 claims description 12
- 230000008901 benefit Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H47/00—Combinations of mechanical gearing with fluid clutches or fluid gearing
- F16H47/06—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the hydrokinetic type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/028—Gearboxes; Mounting gearing therein characterised by means for reducing vibration or noise
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
- Structure Of Transmissions (AREA)
Abstract
The invention discloses a longitudinally-arranged continuously variable transmission, which comprises an output shaft, a continuously variable transmission mechanism, a first clutch and a second clutch which are connected with the continuously variable transmission mechanism, a gear transmission mechanism connected with the first clutch, and a reduction gear mechanism connected with the second clutch and the gear transmission mechanism, wherein the reduction gear mechanism is connected with the output shaft. The longitudinal stepless speed changer adopts a mode of combining a stepless speed change mechanism and a gear speed changer mechanism, can realize a larger speed change range, and can realize higher torque bearing capacity and higher transmission efficiency under a low-speed working condition; but also can improve the compactness of the arrangement structure and reduce the weight and the cost.
Description
Technical Field
The invention belongs to the technical field of speed variators, and particularly relates to a longitudinally-arranged stepless speed changer.
Background
The value of dividing the maximum total transmission ratio by the minimum total transmission ratio of the transmission is called as the speed change range of the transmission, which represents the speed change capability of the transmission, the larger the speed change range is, the improvement of the power performance and the economy level of the whole vehicle and the reduction of the noise of the high-speed cruising working condition of the whole vehicle are facilitated, the speed change range of the stepless speed change mechanism depends on the maximum running radius and the minimum running radius of the input cone pulley and the output cone pulley, and the speed change range of the longitudinally arranged stepless speed change of the existing structure is greatly limited under the constraints of bearing torque, structure, size and the like.
Another requirement of the longitudinally-arranged continuously variable transmission with the existing structure is that when the transmission is in a low-speed working condition, the transmission ratio of the continuously variable transmission mechanism is in a large transmission ratio position, the torque of power input by a power source can be greatly amplified, the transmission part bears extremely large load under a limit large-torque working condition, the bearing capacity of the continuously variable transmission mechanism under the large transmission ratio working condition is insufficient, a method of limiting the maximum input torque or reducing the maximum transmission ratio is generally adopted in design, and negative effects such as insufficient power or reduction of a speed ratio range are brought.
The transmission efficiency of the stepless speed change mechanism is lower under the working condition of a large transmission ratio under the influence of the self efficiency characteristic of the stepless speed change mechanism, and in addition, the hydraulic system pushing the conical disc to clamp needs hydraulic support with enough pressure under the working condition of the large transmission ratio and the large torque, so that the load consumption of an oil pump providing hydraulic pressure is increased; the existing continuously variable transmission is low in efficiency under the working condition of large transmission ratio and large torque.
In addition, the existing continuously variable transmission is provided with a planetary gear type reverse gear mechanism, the mechanism is limited by the aspects of structure, manufacturing process and the like, and the problem that reverse gear howling noise is large is common.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the invention provides a longitudinally arranged continuously variable transmission, with the aim of improving the speed change range and the compactness of the arrangement structure.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the longitudinal stepless speed changer comprises an output shaft, a stepless speed change mechanism, a first clutch and a second clutch which are connected with the stepless speed change mechanism, a gear speed change mechanism connected with the first clutch and a reduction gear mechanism connected with the second clutch and the gear speed change mechanism, wherein the reduction gear mechanism is connected with the output shaft, and the forward gear transmission ratio of the gear speed change mechanism is larger than 1.
The speed reduction gear mechanism comprises a middle shaft, a primary speed reduction driving gear connected with the second clutch, a primary speed reduction driven gear arranged on the middle shaft and meshed with the primary speed reduction driving gear, a secondary speed reduction driving gear arranged on the middle shaft and a secondary speed reduction driven gear meshed with the secondary speed reduction driving gear, and the secondary speed reduction driven gear is connected with the output shaft.
The gear speed change mechanism comprises a gear speed input shaft connected with the first clutch, a first-gear driving gear arranged on the gear speed input shaft and a first-gear driven gear rotatably arranged on the intermediate shaft and meshed with the first-gear driving gear, and a synchronizer used for controlling the first-gear driven gear to be engaged with and separated from the intermediate shaft is arranged on the intermediate shaft.
The gear speed change mechanism further comprises a reverse driving gear arranged on the gear speed input shaft, a reverse idler gear meshed with the reverse driven gear and a reverse driven gear rotatably arranged on the intermediate shaft and meshed with the reverse idler gear, and the synchronizer controls the reverse driven gear to be engaged with and separated from the intermediate shaft.
The synchronizer is located between the first-gear driven gear and the reverse-gear driven gear.
The synchronizer is provided with an engaging tooth sleeve, the engaging tooth sleeve is provided with three working state positions, the three working state positions are respectively an intermediate position, a first engaging position and a second engaging position, and the intermediate position is positioned between the first engaging position and the second engaging position; when the engaging tooth sleeve is positioned at the first engaging position, the engaging tooth sleeve is engaged with the reverse driven gear; the engaging sleeve is engaged with the first driven gear when the engaging sleeve is in the second engaging position.
The longitudinal stepless speed changer further comprises a torsion vibration reduction component, and the stepless speed change mechanism is positioned between the torsion vibration reduction component and the first clutch.
The stepless speed change mechanism comprises an input cone pulley and an output cone pulley, the input cone pulley is positioned between the torsional vibration damping component and the first clutch, the input cone pulley is connected with the torsional vibration damping component and the first clutch, the first clutch is positioned between the input belt pulley and the gear speed change mechanism, the output cone pulley is connected with the second clutch, and the second clutch is positioned between the output belt pulley and the gear speed reduction mechanism.
The torsional vibration damping component is a hydraulic torque converter, a dual-mass flywheel or a torsional vibration damper.
The longitudinal stepless speed changer adopts a mode of combining a stepless speed change mechanism and a gear speed changer mechanism, can realize a larger speed change range, and can realize higher torque bearing capacity and higher transmission efficiency under a low-speed working condition; but also can improve the compactness of the arrangement structure and reduce the weight and the cost.
Drawings
The present specification includes the following drawings, the contents of which are respectively:
FIG. 1 is a schematic view of a longitudinally disposed continuously variable transmission of the present invention;
marked in the figure as: 1. a torque converter; 1a, a pump wheel; 1b, a turbine; 1c, a guide wheel; 2. a transmission housing; 3. an input shaft; 4. a transmission belt; 5. an output cone pulley; 5a, a first output cone disc; 5b, a second output conical disc; 6. inputting cone pulley; 6a, a first input cone disc; 6b, a second input cone disc; 7. a second clutch; 8. a first clutch; 9. a primary reduction drive gear; 10. a first-stage reduction driven gear; 11. a gear shift input shaft; 12. a reverse idler; 13. a reverse gear driving gear; 14. a reverse driven gear; 15. a synchronizer; 16. a first-gear driven gear; 17. a first gear driving gear; 18. a secondary reduction driven gear; 19. an output shaft; 20. a secondary reduction drive gear.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, given by way of example only, is presented in order to facilitate a more complete, accurate and thorough understanding of the concepts and aspects of the present invention by those skilled in the art and to facilitate its practice.
As shown in fig. 1, the present invention provides a longitudinally arranged continuously variable transmission, comprising an output shaft 19, a torsional vibration damping member, a continuously variable transmission mechanism, a first clutch 8 and a second clutch 7 connected with the continuously variable transmission mechanism, a gear transmission mechanism connected with the first clutch 8, and a reduction gear mechanism connected with the second clutch 7 and the gear transmission mechanism, wherein the reduction gear mechanism is connected with the output shaft 19, and the forward gear transmission ratio of the gear transmission mechanism is larger than 1.
Specifically, as shown in fig. 1, the continuously variable transmission mechanism is located between the first clutch 8 and a torsional vibration damper member connected to a power source. The stepless speed change mechanism mainly comprises an input cone pulley 6, an output cone pulley 5 and a transmission belt 4 matched with the input cone pulley 6 and the output cone pulley 5, wherein a central shaft of the input cone pulley 6 is connected with an input shaft 3, the input shaft 3 is connected with a torsional vibration damping component, the input cone pulley 6 is composed of a first input cone disc 6a and a second input cone disc 6b, the first input cone disc 6a and the second input cone disc 6b are connected in a non-relative rotation mode and can move relative to each other within a certain range, the output cone pulley 5 is composed of a first output cone disc 5a and a second output cone disc 5b, the transmission belt 4 is wound between the input cone pulley 6 and the output cone pulley 5 in a relatively axial mode within a certain range, the transmission belt 4 is clamped in a controllable mode through the first input cone disc 6a and the second input cone disc 6b, and the transmission belt 4 is clamped in a controllable mode through the first output cone disc 5a and the second output cone disc 5 b.
As shown in fig. 1, the input cone pulley 6 is located between the torsional vibration damper and the first clutch 8, the central shaft of the input cone pulley 6 is connected to the first clutch 8, and the central shaft of the output cone pulley 5 is connected to the second clutch 7. The first clutch 8 and the input cone pulley 6 are coaxially arranged, and the input end of the first clutch 8 is connected with the input cone pulley 6 in a non-relative rotation way. The second clutch 7 and the output cone pulley 5 are coaxially arranged, and the input end of the second clutch 7 is connected with the output cone pulley 5 in a non-relative rotation way.
As shown in fig. 1, the reduction gear mechanism includes a counter shaft 21, a primary reduction driving gear 9 fixedly connected to the output end of the second clutch 7, a primary reduction driven gear 10 provided on the counter shaft and meshed with the primary reduction driving gear 9, a secondary reduction driving gear 20 provided on the counter shaft, and a secondary reduction driven gear 18 meshed with the secondary reduction driving gear 20, the secondary reduction driven gear 18 being connected to an output shaft 19. The second clutch 7 is used for controlling the power transmission and interruption between the speed reduction gear mechanism and the stepless speed change mechanism, the second clutch 7 is positioned between the primary speed reduction driving gear 9 and the output cone pulley 5, the primary speed reduction driven gear 10 is fixedly connected with the intermediate shaft in a coaxial way, the secondary speed reduction driving gear 20 is fixedly connected with the intermediate shaft in a coaxial way, the secondary speed reduction driven gear 18 is fixedly connected with the output shaft 19 in a coaxial way, the axis of the output shaft 19 is parallel to the intermediate shaft and the axis of the input shaft 3, and the output shaft 19 is a power output part of the longitudinally arranged stepless speed change device.
As shown in fig. 1, the gear change mechanism includes a gear input shaft 11 connected to the first clutch 8, a first-gear drive gear 17 provided on the gear input shaft 11, a first-gear driven gear 16 rotatably provided on the intermediate shaft and meshed with the first-gear drive gear 17, a reverse-gear drive gear 13 provided on the gear input shaft 11, a reverse-gear idler gear 12 meshed with the reverse-gear driven gear 14, and a reverse-gear driven gear 14 rotatably provided on the intermediate shaft and meshed with the reverse-gear idler gear 12, a synchronizer 15 provided on the intermediate shaft for controlling the engagement and disengagement of the first-gear driven gear 16 with the intermediate shaft, and the synchronizer 15 for controlling the engagement and disengagement of the reverse-gear driven gear 14 with the intermediate shaft. The first clutch 8 is used for controlling the transmission and interruption of power between the gear speed change mechanism and the stepless speed change mechanism, the gear input shaft 11 is fixedly connected with the output end of the first clutch 8, the first clutch 8 is positioned between the gear input shaft 11 and the input cone pulley 6, the axis of the gear input shaft 11 is parallel to the axis of the intermediate shaft, and the gear input shaft 11 is parallel to the axes of the input shaft 3 and the output shaft 19. The gear input shaft 11 is provided with a first gear driving gear 17 which is not connected with the gear input shaft in a relative rotation mode, the intermediate shaft is provided with a synchronizer 15 which is not connected with the gear input shaft in a relative rotation mode, the intermediate shaft is also provided with a first gear driven gear 16 and a reverse gear driven gear 14 which can rotate freely relative to the intermediate shaft, the reverse gear driven gear 14, the first gear driven gear 16 and the synchronizer 15 are positioned between the first-stage reduction driven gear 10 and the second-stage reduction driving gear 20, and the diameter of the first gear driving gear 17 is smaller than that of the first gear driven gear 16. The synchronizer 15 is arranged between the first-gear driven gear 16 and the reverse-gear driven gear 14. The reverse gear idler 12 is rotatably arranged in the transmission housing 2, a reverse gear driving gear 13 which is not connected with the gear input shaft 11 in a relative rotation mode is arranged on the gear input shaft, and the reverse gear idler 12 is meshed with the reverse gear driving gear 13 and the reverse gear driven gear 14 respectively.
The synchronizer 15 has an engagement sleeve which is axially movable without relative rotational connection with the intermediate shaft, the engagement sleeve having three operating state positions, which are respectively an intermediate position, a first engagement position and a second engagement position, the intermediate position being located between the first engagement position and the second engagement position. When the engaging tooth sleeve is positioned at the first engaging position, the engaging tooth sleeve is engaged with the reverse gear driven gear 14, after the engaging tooth sleeve is engaged with the reverse gear driven gear 14, the synchronizer 15 connects the reverse gear driven gear 14 with the intermediate shaft into a whole, the reverse gear driven gear 14 and the intermediate shaft can synchronously rotate, and the first gear driven gear 16 is sleeved on the intermediate shaft in an empty mode; when the engaging tooth sleeve is at the second engaging position, the engaging tooth sleeve is engaged with the first-gear driven gear 16, after the engaging tooth sleeve is engaged with the first-gear driven gear 16, the synchronizer 15 connects the first-gear driven gear 16 and the intermediate shaft into a whole, and the first-gear driven gear 16 and the intermediate shaft can synchronously rotate, and at the moment, the reverse-gear driven gear 14 is sleeved on the intermediate shaft in an empty mode. When the engaging gear sleeve is at the intermediate position, the engaging gear sleeve is not engaged with the reverse gear driven gear 14 and the first gear driven gear 16, the engaging gear sleeve is in a separated state with the reverse gear driven gear 14 and the first gear driven gear 16, the reverse gear driven gear 14 and the first gear driven gear 16 cannot synchronously rotate with the intermediate shaft, and at the moment, the reverse gear driven gear 14 and the first gear driven gear 16 are in idle sleeve on the intermediate shaft.
As shown in fig. 1, the longitudinally arranged continuously variable transmission of the present invention constructs two power transmission paths through two clutches, a continuously variable transmission mechanism, a gear transmission mechanism and a reduction gear mechanism, wherein the two power transmission paths are a first power transmission path and a second power transmission path respectively. The first power transmission path is a path through which power of the power source is transmitted via the center shaft of the input cone pulley 6, the first clutch 8, the gear change mechanism, the intermediate shaft 21, the secondary reduction driving gear 20, the secondary reduction driven gear 18, and the output shaft 19; the second power transmission path is a path through which power of the power source is transmitted via the continuously variable transmission mechanism, the second clutch 7, the reduction gear mechanism, and the output shaft 19; the two transmission paths are switched by the cooperation of the first clutch 8 and the second clutch 7, so that the power of the power source can be selectively transmitted through the first power transmission path and the second power transmission path. When the power of the longitudinally-arranged continuously variable transmission is transmitted along the first power transmission path, the first clutch 8 is in an engaged state, and the second clutch 7 is in a disengaged state; when the power of the continuously variable transmission is transmitted along the second power transmission path, the first clutch 8 is in a disengaged state and the second clutch 7 is in an engaged state.
The torsional vibration damping component may be a hydrodynamic torque converter, a dual mass flywheel or a torsional vibration damper. As shown in fig. 1, in the present embodiment, the torsional vibration damping member is a torque converter 1.
The longitudinal stepless speed changer has three actual working gears, namely a reverse gear, a forward gear and a stepless speed change gear.
When the longitudinal continuously variable transmission is in a reverse gear, the first clutch 8 is in an engaged state, the second clutch 7 is in a disengaged state, the engaging gear sleeve of the synchronizer 15 is in a first engaged position, the engaging gear sleeve is engaged with the reverse driven gear 14, the power of a power source is sequentially transmitted to the output shaft 19 through the torsional vibration damping component, the input shaft 3, the central shaft of the input cone pulley 6, the first clutch 8, the gear input shaft 11, the reverse driving gear 13, the reverse idle gear 12, the reverse driven gear 14, the synchronizer 15, the intermediate shaft 21, the secondary reduction driving gear 20 and the secondary reduction driven gear 18, and the power of the output shaft 19 is transmitted to wheels of a vehicle, so that a reverse gear function is realized.
When the longitudinally-arranged continuously variable transmission is in a forward gear position, the first clutch 8 is in an engaged state, the second clutch 7 is in a disengaged state, power of a power source is sequentially transmitted to the output shaft 19 through the torsional vibration damping component, the input shaft 3, the central shaft of the input cone pulley 6, the first clutch 8, the gear position input shaft 11, the first-gear driving gear 17, the first-gear driven gear 16, the synchronizer 15, the intermediate shaft 21, the secondary reduction driving gear 20 and the secondary reduction driven gear 18, and the power of the output shaft 19 is transmitted to wheels of a vehicle, so that the forward gear position function is realized, and the forward gear position is usually used as the first gear for starting the vehicle.
When the longitudinal continuously variable transmission is in a continuously variable transmission gear, the first clutch 8 is in a disengaged state, the second clutch 7 is in an engaged state, power of a power source is sequentially transmitted to the output shaft 19 through the torsional vibration damper, the input shaft 3, the continuously variable transmission mechanism, the second clutch 7 and the reduction gear mechanism, and power of the output shaft 19 is transmitted to wheels of a vehicle. The input cone pulley 6 and the output cone pulley 5 of the stepless speed change mechanism are respectively provided with a hydraulic piston clamping mechanism, the hydraulic pressure of the hydraulic piston clamping mechanism on the input cone pulley 6 is adjusted to adjust the clamping force of the two cone discs on the transmission belt 4, the hydraulic pressure of the hydraulic piston clamping mechanism on the input cone pulley 6 is adjusted to adjust the clamping force of the two cone discs on the output cone pulley 5 to the transmission belt 4, the transmission belt 4 is kept in a 'tightening' state under the combined action of the clamping forces exerted by the input cone pulley 6 and the output cone pulley 5 to transmit power, the value of the running radius of the transmission belt 4 on the output cone pulley 5 divided by the running radius of the transmission belt 4 on the input cone pulley 6 is called a transmission ratio, the running radius of the transmission belt 4 on the input cone pulley 6 and the running radius of the transmission belt 4 on the output cone pulley 5 can be adjusted by adjusting the hydraulic pressure of the hydraulic piston clamping mechanism on the input cone pulley 6 and the transmission belt 5 respectively, the transmission ratio of the stepless speed change mechanism can be adjusted, and the transmission ratio of the stepless speed change mechanism can be continuously adjusted, and the stepless speed change function is realized.
The longitudinal continuously variable transmission of the present invention is provided with the forward gear stage, the forward gear stage transmission ratio of the longitudinal continuously variable transmission gear shifting mechanism is greater than 1, and the total transmission ratio of the forward gear stage of the gear shifting mechanism can be set to be greater than the maximum total transmission ratio of the step transmission mechanism of the conventional continuously variable transmission, so that the value obtained by dividing the total transmission ratio of the forward gear stage of the longitudinal continuously variable transmission of the present invention by the minimum total transmission ratio of the continuously variable transmission mechanism in the longitudinal continuously variable transmission of the present invention is greater than the value obtained by dividing the maximum total transmission ratio of the continuously variable transmission mechanism of other conventional continuously variable transmissions by the minimum total transmission ratio of the continuously variable transmission mechanism, and therefore the present invention has a larger gear shift range than the conventional known continuously variable transmission.
On the other hand, the longitudinally-arranged continuously variable transmission of the present invention can be designed to have a larger shift range than the conventionally-known longitudinally-arranged continuously variable transmission while moderately reducing the shift range of the continuously variable transmission mechanism therein, with the advantage that the size and weight of the input cone pulley 6, the output cone pulley 5, and the support housing thereof of the continuously variable transmission mechanism can be relatively reduced and lowered.
The gear change mechanism provided in the longitudinal continuously variable transmission of the present invention brings about another advantage in that the gear steps of the transmission of the present invention are usually set as starting steps, i.e., first and reverse steps, for starting and low vehicle speed conditions, the first and reverse steps usually having a large gear ratio in which the torque value of the power input from the power source is greatly amplified so that the transmission member is subjected to a large load, and the longitudinal continuously variable transmission of the present invention in which the power is transmitted by the gear change mechanism at which the continuously variable transmission mechanism does not transmit the power. The gear speed change mechanism is obviously superior to the stepless speed change mechanism in bearing capacity and transmission efficiency, so that the transmission has the advantages of higher torque bearing capacity and higher transmission efficiency under the working condition of low vehicle speed compared with the longitudinally-arranged stepless speed change mechanism disclosed by the prior art.
The gear input shaft 11 of the longitudinal stepless speed changer and the rotating shaft of the driving gear, the rotating shaft of the reverse idler gear 12 and the rotating shaft of the reverse driven gear 14 which are arranged on the gear input shaft are mutually parallel, and the reverse structure of the parallel shaft gear arrangement replaces the reverse structure of the prior speed changer to a planetary gear type reverse structure, and correspondingly cancels the reverse brake of the planetary gear type reverse mechanism for switching the reverse path, thereby relatively reducing the manufacturing cost. On the other hand, the planetary gear type reverse gear mechanism is limited by the aspects of structure, manufacturing process and the like, the problem of high noise of reverse gear howling is commonly existed, and the reverse gear of the transmission structure can realize excellent reverse gear noise level under the condition of conventional manufacturing process.
One of the features of the longitudinally arranged continuously variable transmission of the present invention is that at least one synchronizer 15 without relative rotation connection is provided on the intermediate shaft for realizing gear shift, at least two "blank" gears which can freely rotate relative to the intermediate shaft are provided, and these "blank" gears are driven gears of the gear shifting mechanism, and the design has the advantage that the aforementioned first power transmission path and second power transmission path can share a plurality of components without additional arrangement, and the shared components are the intermediate shaft 21 and its supporting bearing, the secondary reduction driving gear 20, and the secondary reduction driven gear 18, thereby saving the number of parts and arrangement space, and reducing weight and cost.
From the above description of the specific embodiments of the longitudinally arranged continuously variable transmission according to the present invention, it can be seen that the non-limiting innovative points and advantages of the present invention are that a compact, low weight, low cost longitudinally arranged continuously variable transmission structure is achieved, while a larger transmission range is achieved, a higher torque carrying capacity and higher transmission efficiency at low speeds are achieved, and a better reverse running noise level is achieved.
The invention is described above by way of example with reference to the accompanying drawings. It will be clear that the invention is not limited to the embodiments described above. As long as various insubstantial improvements are made using the method concepts and technical solutions of the present invention; or the invention is not improved, and the conception and the technical scheme are directly applied to other occasions and are all within the protection scope of the invention.
Claims (2)
1. The longitudinal stepless speed changer comprises an output shaft and a stepless speed change mechanism and is characterized in that: the device also comprises a first clutch and a second clutch which are connected with the stepless speed change mechanism, a gear speed change mechanism connected with the first clutch and a reduction gear mechanism connected with the second clutch and the gear speed change mechanism, wherein the reduction gear mechanism is connected with the output shaft, and the forward gear transmission ratio of the gear speed change mechanism is more than 1;
the speed reduction gear mechanism comprises a middle shaft, a primary speed reduction driving gear connected with the second clutch, a primary speed reduction driven gear arranged on the middle shaft and meshed with the primary speed reduction driving gear, a secondary speed reduction driving gear arranged on the middle shaft and a secondary speed reduction driven gear meshed with the secondary speed reduction driving gear, and the secondary speed reduction driven gear is connected with the output shaft;
the gear speed change mechanism comprises a gear speed input shaft connected with the first clutch, a first-gear driving gear arranged on the gear speed input shaft and a first-gear driven gear rotatably arranged on the intermediate shaft and meshed with the first-gear driving gear, and a synchronizer used for controlling the first-gear driven gear to be engaged with and separated from the intermediate shaft is arranged on the intermediate shaft;
the gear speed change mechanism further comprises a reverse driving gear arranged on the gear speed input shaft, a reverse idle gear meshed with the reverse driving gear and a reverse driven gear rotatably arranged on the intermediate shaft and meshed with the reverse idle gear, and the synchronizer controls the reverse driven gear to be engaged with and separated from the intermediate shaft;
the synchronizer is positioned between the first-gear driven gear and the reverse-gear driven gear;
the synchronizer is provided with an engaging tooth sleeve, the engaging tooth sleeve is provided with three working state positions, the three working state positions are respectively an intermediate position, a first engaging position and a second engaging position, and the intermediate position is positioned between the first engaging position and the second engaging position; when the engaging tooth sleeve is positioned at the first engaging position, the engaging tooth sleeve is engaged with the reverse driven gear; when the engaging tooth sleeve is positioned at the second engaging position, the engaging tooth sleeve is engaged with the first-gear driven gear;
the longitudinal stepless speed changer also comprises a torsion vibration reduction component, and the stepless speed change mechanism is positioned between the torsion vibration reduction component and the first clutch;
the stepless speed change mechanism comprises an input cone pulley and an output cone pulley, the input cone pulley is positioned between the torsional vibration damping component and the first clutch, the input cone pulley is connected with the torsional vibration damping component and the first clutch, the first clutch is positioned between the input belt pulley and the gear speed change mechanism, the output cone pulley is connected with the second clutch, and the second clutch is positioned between the output belt pulley and the gear speed reduction mechanism.
2. The longitudinally disposed continuously variable transmission of claim 1, wherein: the torsional vibration damping component is a hydraulic torque converter, a dual-mass flywheel or a torsional vibration damper.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111044952.XA CN113700821B (en) | 2021-09-07 | 2021-09-07 | Longitudinally-arranged stepless speed changer |
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|---|---|---|---|
| CN202111044952.XA CN113700821B (en) | 2021-09-07 | 2021-09-07 | Longitudinally-arranged stepless speed changer |
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| CN113700821A CN113700821A (en) | 2021-11-26 |
| CN113700821B true CN113700821B (en) | 2024-01-30 |
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| CN114165573B (en) * | 2021-12-15 | 2024-09-27 | 芜湖万里扬变速器有限公司 | Longitudinally-arranged stepless speed changer |
| CN117553108B (en) * | 2024-01-12 | 2024-04-30 | 北京中科原动力科技有限公司 | Agricultural machinery gearbox and agricultural machinery |
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| CN113700821A (en) | 2021-11-26 |
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