CN210003770U - Transmission system integrating static pressure drive and mechanical drive and whole vehicle mechanism - Google Patents

Transmission system integrating static pressure drive and mechanical drive and whole vehicle mechanism Download PDF

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Publication number
CN210003770U
CN210003770U CN201920417270.0U CN201920417270U CN210003770U CN 210003770 U CN210003770 U CN 210003770U CN 201920417270 U CN201920417270 U CN 201920417270U CN 210003770 U CN210003770 U CN 210003770U
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gear
transmission system
engine
planetary gear
drive
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许力杰
陈岩
赵金光
于鹏飞
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Weichai Hydraulic Transmission Co ltd
Weichai Power Co Ltd
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Weichai Power Co Ltd
Linde Hydraulics China Co Ltd
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Abstract

The utility model discloses an integrated static pressure drive and mechanical drive's transmission system and whole car mechanism, belong to mechanical transmission technical field this integrated static pressure drive and mechanical drive's transmission system includes the engine, drive train, second drive train and output shaft, drive train is including the variable pump of transmission connection in proper order between engine main shaft and output shaft, the ration motor, planetary gear system and clutch , the variable pump is connected with engine main shaft transmission, the second drive train includes transmission connection at the epaxial planetary gear system two of engine, connect the stopper between the outer ring gear two of planetary gear system two and casing, and connect the second clutch between the planet carrier of planetary gear system two and output shaft.

Description

Transmission system integrating static pressure drive and mechanical drive and whole vehicle mechanism
Technical Field
The utility model relates to a mechanical transmission technical field especially relates to integrated static pressure drive and mechanical drive's transmission system and whole car mechanism.
Background
At present, a static pressure driving system or a hydraulic mechanical driving system is mostly adopted in various walking engineering mechanical products such as loaders, forklift trucks and the like. The static pressure driving system has the advantages of high efficiency in a low-speed area and good operation comfort, but the efficiency in a high-speed area is lower and the cost is higher. When the hydraulic machine is driven to work in a low speed region, the transmission efficiency is low due to the existence of the hydraulic torque converter, but after the pump impeller and the turbine of the hydraulic torque converter are locked in a high speed region, the transmission efficiency is high.
Wherein the hydrostatic drive system: a hydraulic closed system is formed by adopting a hydraulic pump and a motor, the hydraulic pump is connected with an engine, the hydraulic motor is connected with a mechanical gearbox bridge, and the power of the engine is transmitted to a mechanical transmission system through the hydraulic system, so that the power is transmitted to the edge of a whole wheel, and the traction force and the speed requirement of the whole vehicle are realized.
The hydraulic driving system is type driving system with engine connected to torque converter and connected serially to power shifting gear box and axle and with engine power transmitted to wheel via torque converter and mechanical transmission system.
For static pressure driving, in a high-speed region of a whole vehicle, as the displacement of a hydraulic motor is gradually reduced and the rotating speed is gradually increased, the transmission efficiency of a hydraulic system obviously slides down. If the whole vehicle works under the high-speed factory transportation working condition for a long time, the engine runs at a high rotating speed, and the hydraulic system runs under the state of lower pressure and lower transmission efficiency, the oil consumption is increased sharply, and the economical efficiency is poor.
For the transmission of the hydraulic machine, when the whole vehicle is under the working condition of low speed and heavy load, in order to meet the requirement of maximum traction force, the hydraulic torque converter is in a stall state, the theoretical efficiency is zero at the moment, and the work done by the engine is converted into heat waste through the oil stirring of the torque converter.
The two schemes have technical characteristics respectively, but the two schemes do not have the performance advantages of a transmission system with bodies, and at present, various walking engineering machines such as a loader forklift and the like have higher requirements on controllability and comprehensive efficiency of dynamic and high-low speed sections.
Therefore, there is a need for transmission systems for integrated hydrostatic and mechanical driving of walking process machines, which can adopt hydrostatic driving systems in low speed region (operation section) to ensure working efficiency and operation comfort, and convert into power shifting transmission systems in high speed region (driving section).
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide kinds of integrated static pressure drive and mechanical drive's transmission system and whole car mechanism can provide the transmission mode of kinds of comprehensive static pressure transmission and hydraulic machine transmission both performance advantages for walking type engineering machine tool.
In order to realize the purpose, the following technical scheme is provided:
the utility model provides an transmission system integrating hydrostatic drive and mechanical drive, which comprises an engine, a transmission system, a second transmission system and an output shaft,
the th power train comprises a variable pump, a fixed displacement motor, a planetary gear train and a clutch which are sequentially connected between the engine main shaft and the output shaft in a transmission manner, and the variable pump is connected with the engine main shaft in a transmission manner;
the second transmission system comprises a second planetary gear train which is in transmission connection with the main shaft of the engine, a brake which is connected between an outer gear ring II of the second planetary gear train and the shell, and a second clutch which is connected between a second sun gear of the second planetary gear train and the output shaft.
, the transmission system further comprises a damper connected to the main shaft of the engine between the engine and the planetary gear train.
, the planetary gear set includes a sun gear , an outer ring gear , planetary gears , the sun gear is in transmission connection with the constant-speed motor, and the planetary gears are connected with the output shaft through the clutch .
, the planetary gear set further includes a second planet gear, and the second planet gear is connected with the third planet gear .
, the planetary gear train II further comprises a planet carrier and a planet gear III, the sun gear II is in transmission connection with the main shaft of the engine, and the planet carrier of the planetary gear train II is in mechanical connection with the output shaft.
, the integrated hydrostatic and mechanical drive transmission system further includes a main gear disposed on the main shaft of the engine, and an input gear disposed at the drive end of the variable displacement pump, the input gear being engaged with the main gear, the input gear and the main gear forming a gear pair.
, the transmission system integrating hydrostatic drive and mechanical drive further comprises an output gear and an external gear, wherein the output gear is capable of meshing with the output end of the planetary gear set , the output gear is always mechanically connected with the planet carrier of the planetary gear set II, the external gear is arranged on the output shaft, the external gear is meshed with the output gear, and the output gear and the external gear form a gear pair.
, the variable displacement pump is a closed electric proportional variable displacement pump.
, the rated power of the engine is 80-100kW, the rated input rotation speed is 2100-.
The utility model also provides kinds of whole car mechanisms, including the above-mentioned technical scheme integrated static pressure drive and mechanical drive's transmission system.
Compared with the prior art, the utility model provides an integrated hydrostatic drive and mechanical drive's transmission system, when clutch is closed, when stopper and second clutch all break off, engine power transmits in proper order to variable pump, quantitative motor, planetary gear system and output shaft, when the stopper is closed, when clutch and second clutch break off, engine power transmits in proper order to planetary gear system two, planetary gear system two's planet carrier and output shaft, the planet carrier consumes power this moment, when second clutch is closed, clutch and stopper all break off, engine power directly transmits the output shaft through the sun gear of planetary gear system two, the planet carrier does not consume power this moment, this kind of structure adopts sets of variable pump and quantitative motor structure, and two sets of different planetary gear system and planetary gear system two, through being connected with different clutches, realized the steady switching between pure hydrostatic drive and the pure mechanical drive, can satisfy the requirement of low-speed section high efficiency easy operation, satisfy the high-speed section high efficiency driven performance demand, synthesized the hydrostatic and mechanical drive's advantage to satisfy the engineering mechanical cost controllable prerequisite under the actual needs again.
Drawings
Fig. 1 is a schematic diagram of a transmission system integrating a hydrostatic drive and a mechanical drive according to an embodiment of the present invention;
fig. 2 is a transmission schematic diagram of the transmission system integrating the hydrostatic drive and the mechanical drive in the pure hydrostatic drive section according to the embodiment of the present invention;
fig. 3 is a transmission schematic diagram of the transmission system integrating the hydrostatic drive and the mechanical drive in the embodiment of the present invention at power shift 1 gear;
fig. 4 is a transmission schematic diagram of the transmission system integrating hydrostatic drive and mechanical drive in the embodiment of the present invention at power shift 2.
The reference numbers 1-engine, 2-variable pump, 3-fixed displacement motor, 4-planetary gear train , 41-sun gear , 42-outer gear , 43-planetary gear , 44-planetary gear II, 5-clutch , 6-brake, 7-clutch II, 8-planetary gear train II, 81-sun gear II, 82-outer gear II, 83-planetary gear III, 9-output gear, 10-main gear, 11-input gear, 12-shock absorber, 13-external gear and 14-output shaft.
Detailed Description
In order to make the technical problem solved by the present invention, the technical solution adopted and the technical effect achieved by the present invention clearer, the following will make steps of detailed description on the technical solution of the embodiments of the present invention with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention , but not all embodiments.
The embodiment provides transmission systems integrating static pressure drive and mechanical drive, which are mainly applied to walking engineering machinery such as a 3t loader, a forklift truck and the like, have simple control systems and cost between static pressure drive and hydraulic drive, and realize various performance advantages such as high comprehensive efficiency, good maneuverability and the like, as shown in fig. 1, the transmission system integrating static pressure drive and mechanical drive comprises an engine 1, a transmission system, a second transmission system and an output shaft 14, wherein the 0 transmission system comprises a variable pump 2, a fixed-displacement motor 3, a planetary gear train and a clutch which are sequentially connected between a main shaft of the engine 1 and the output shaft 14 in a transmission way, the variable pump 2 is in transmission connection with the main shaft of the engine 1, the second transmission system comprises a planetary gear train two 8 in transmission connection with the main shaft of the engine 1, a brake 6 connected between an outer gear ring two 82 of the planetary gear train two 8 and a shell, and a clutch second clutch 7 connected between a sun gear two 81 of the planetary gear train two 8 and the output shaft 14, and specifically, the planetary gear train 2 comprises a sun gear 41, a sun gear , an outer gear 43, a planetary gear 43 and a planetary gear 3878, a planetary gear 43 connected with the sun gear of the engine 1, a planetary gear train 2, a planetary gear 43 and an output shaft 14 connected with a planetary gear of the planetary gear train 2, a planetary gear 31, a planetary.
, in order to ensure the stability during the transmission, the transmission system integrating the hydrostatic drive and the mechanical drive also comprises a damper 12, the damper 12 is connected on the main shaft of the engine 1 between the engine 1 and the planetary gear train II 8, optionally, the damper 12 is a torsion damper.
Optionally, the transmission system integrating the static pressure drive and the mechanical drive further comprises a main gear 10, an input gear 11, an output gear 9 and an external gear 13, wherein the main gear 10 is arranged on a main shaft of the engine 1, the input gear 11 is arranged at a driving end of the variable displacement pump 2, the input gear 11 is in transmission connection with the main gear 10, the input gear 11 and the main gear 10 form a gear pair capable of driving the variable displacement pump 2 to work, the output gear 9 and the external gear ring 42 can be meshed when transmitting power, the output gear 9 and a planet carrier of the planetary gear train two 8 are separated by a transmission gap, the external gear 13 is arranged on the output shaft 14, the external gear 13 is meshed with the output gear 9, and the output gear 9 and the external gear 13 form a gear pair capable of transmitting power to the output shaft 14.
The transmission principle in this embodiment is as follows:
the number of teeth of each gear in this embodiment is designed as shown in the following table:
Figure BDA0002011968460000061
in the embodiment, the calculated speed ratio of the vehicle axle is 20.85, the rolling radius of the tire is 700mm, the transmission scheme of the embodiment adopts a 3-segment transmission principle, a structure of a closed electric proportional variable pump and a fixed-displacement motor 3 is adopted, and two different sets of planetary gear trains 4 and a planetary gear train II 8 are adopted to be matched with the engine 1 with rated power of 80-100kW and rated input rotation speed of 2100 plus 2300rpm, the displacements of the electric proportional variable pump and the fixed-displacement motor 3 are both 100 plus 110cc, and the rated pressure is 400 plus 500bar, the embodiment preferably selects the engine 1 with rated power of 90kW and rated input rotation speed of 2200rpm, the displacements of the electric proportional variable pump and the fixed-displacement motor 3 are both 105cc, and the rated pressure is both 450bar, the embodiment can finally reach the highest speed of 25-30km/h, and simultaneously realize the performance of the maximum traction of 95kN, is suitable for walking systems such as 3t loaders, forklift trucks and the like, the control system is simple, the cost is between static transmission and the static pressure transmission and the integrated transmission process is realized as follows:
(1) pure static pressure driving section
When the clutch is closed and the brake 6 and the two clutches 7 are disconnected, the power of the engine 1 is transmitted to the given amount of motor 3 through the variable pump 2 at the moment, the fixed amount of motor 3 drives the sun gear 41 of the planetary gear train , the outer ring gear 42 of the planetary gear train 4 is fixed all the time, the planetary gears and the planetary gears 44 can output at the rotating speed determined by , and the output torque of the fixed amount of motor 3 is transmitted to the output gear 9 through the clutch and then transmitted to the output shaft 14 through the -stage outer meshing gear 13 at the moment, and finally transmitted to the axle and the wheel rim to realize the output of the vehicle speed and the traction force.
When the engine 1 runs at a rated rotating speed and the displacement of the variable pump 2 is 0, the output rotating speed of the quantitative motor 3 is 0 at the moment, the whole vehicle is in a parking state, when the displacement of the variable pump 2 is gradually increased, the output rotating speed of the quantitative motor 3 is gradually increased, the whole vehicle is accelerated at the moment, the whole vehicle can be smoothly accelerated to 7-8km/h in the transmission stage through calculation, the common working interval of the shoveling and transporting machinery is met, and the principle of a transmission system at the moment is the same as that of static pressure transmission.
(2) Power shift 1 gear
The transmission schematic diagram is shown in FIG. 3, wherein the arrow and the thick line represent the transmission line, as the vehicle speed gradually rises to the limit value in the pure static pressure driving section, the clutch 5 is disconnected, the brake 6 is closed, the displacement of the variable displacement pump 2 returns to zero, the fixed displacement motor 3 does not rotate any more and is disconnected with the output gear 9, at this time, the power of the engine 1 drives the second sun gear 81 of the second planetary gear train 8 through the shock absorber 12, the rotating speed of the second outer ring gear 82 of the second planetary gear train 8 is 0 due to the closing of the brake 6, the planet carrier of the second planetary gear train 8 can output according to the specific rotating speed, at this time, the planet carrier consumes power, the rotating speed of the planet carrier is different from the rotating speed of the second sun gear 81, the planet carrier drives the output gear 9 and transmits the rotating speed and the.
In order to realize the smooth combination of the pure hydrostatic driving section and the first section of mechanical transmission, the rotating speed of the engine 1 needs to be reduced to 1790rpm through calculation, the output rotating speed of the output gear 9 is the same as the output rotating speed of the pure hydrostatic driving section at the end point, no impact exists when the clutch 5 is disengaged and the brake 6 is closed, the speed of the whole vehicle smoothly transits to a mechanical shifting interval, then the rotating speed of the engine 1 is continuously increased to 2200rpm, and the whole vehicle is smoothly accelerated to 10-15 km/h.
(3) Power shift 2-gear
The power shift 2 gear needs to close the second clutch 7, the clutch 5 and the brake 6 are both disconnected, at the moment, the power of the engine 1 is directly transmitted to the output gear 9 through the second sun gear 81 of the second planetary gear train 8, at the moment, the planet carrier does not consume power, the rotating speed of the planet carrier is the same as that of the second sun gear 81, and then the rotating speed is transmitted to the output shaft 14 through the -stage external meshing external gear 13, the speed is smoothly transited by similarly switching the pure static pressure driving section to the first-stage mechanical transmission, at the moment, through calculation, the rotating speed of the engine 1 also needs to be reduced by to a certain degree, the rotating speed of the output shaft is ensured not to be changed, then the rotating speed of the engine 1 is increased to the rated rotating speed, the final acceleration of the whole vehicle is realized, and the power shift 2 gear is calculated, when the rotating speed of the engine 1 reaches 2200rpm, the maximum vehicle speed of the whole vehicle can reach 25km/h, and the actual requirement of the loader like is met.
The embodiment also provides kinds of whole vehicle mechanisms, which comprise the integrated static pressure drive and mechanical drive transmission system, and can meet the requirements of low-speed section high efficiency and easy control and the performance requirements of high-speed section high efficiency drive.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims (10)

  1. A transmission system integrating hydrostatic drive and mechanical drive is characterized by comprising an engine (1), a th transmission system, a second transmission system and an output shaft (14),
    the th power train comprises a variable pump (2), a fixed-displacement motor (3), a planetary gear train (4) and a clutch (5) which are sequentially connected between the main shaft of the engine (1) and the output shaft (14) in a transmission manner, and the variable pump (2) is connected with the main shaft of the engine (1) in a transmission manner;
    the second transmission system comprises a second planetary gear train (8) in transmission connection with a main shaft of the engine (1), a brake (6) connected between an outer gear ring (82) and a shell of the second planetary gear train (8), and a second clutch (7) connected between a sun gear (81) and the output shaft (14) of the second planetary gear train (8).
  2. 2. The integrated hydrostatic and mechanical drive transmission system according to claim 1, further comprising a damper (12), the damper (12) being connected to a main shaft of the engine (1) between the engine (1) and the second planetary gear train (8).
  3. 3. The integrated hydrostatic and mechanical drive transmission system according to claim 1, wherein the planetary gear set (4) includes a sun gear (41), an outer ring gear (42), and planetary gears (43), the sun gear (41) is in transmission connection with the constant-displacement motor (3), and the planetary gears (43) are connected with the output shaft (14) through the clutch (5).
  4. 4. The integrated hydrostatic and mechanical drive transmission system of claim 3, wherein the planetary gear train (4) further includes planet gears two (44), and the planet gears two (44) are connected with the planet gears (43).
  5. 5. The integrated hydrostatic and mechanical drive transmission system according to claim 1, wherein the planetary gear train two (8) further comprises a planet carrier and a planet gear three (83), the sun gear two (81) is in transmission connection with the main shaft of the engine (1), and the planet carrier of the planetary gear train two (8) is in mechanical connection with the output shaft (14).
  6. 6. The integrated hydrostatic and mechanical drive transmission system according to claim 1, further comprising a main gear (10) and an input gear (11), wherein the main gear (10) is disposed on a main shaft of the engine (1), the input gear (11) is disposed at a drive end of the variable displacement pump (2), the input gear (11) is engaged with the main gear (10), and the input gear (11) and the main gear (10) constitute a gear pair.
  7. 7. The integrated hydrostatic and mechanical drive transmission system according to claim 1, further comprising an output gear (9) and an external gear (13), wherein the output gear (9) is engageable with the output end of the planetary gear train (4), the output gear (9) is mechanically connected with the planetary carrier of the planetary gear train two (8) at all times, the external gear (13) is arranged on the output shaft (14), the external gear (13) is engaged with the output gear (9), and the output gear (9) and the external gear (13) form a gear pair.
  8. 8. The integrated hydrostatic and mechanical drive transmission system of claim 1, wherein the variable displacement pump is a closed electric proportional variable displacement pump.
  9. 9. The transmission system integrating hydrostatic drive and mechanical drive as claimed in claim 1, wherein the rated power of the engine (1) is 80-100kW, the rated input rotation speed is 2100-.
  10. The entire vehicle mechanism of , wherein the transmission system comprises the integrated hydrostatic drive and mechanical drive of any of claims 1-9- .
CN201920417270.0U 2019-03-29 2019-03-29 Transmission system integrating static pressure drive and mechanical drive and whole vehicle mechanism Active CN210003770U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111516478A (en) * 2020-03-23 2020-08-11 潍柴动力股份有限公司 Transmission system of vehicle and vehicle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111516478A (en) * 2020-03-23 2020-08-11 潍柴动力股份有限公司 Transmission system of vehicle and vehicle

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Address after: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197

Patentee after: WEICHAI POWER Co.,Ltd.

Patentee after: Weichai Hydraulic Transmission Co.,Ltd.

Address before: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197

Patentee before: WEICHAI POWER Co.,Ltd.

Patentee before: LINDE HYDRAULICS (CHINA) Co.,Ltd.

CP01 Change in the name or title of a patent holder