CN108799441B

CN108799441B - Multi-speed transmission

Info

Publication number: CN108799441B
Application number: CN201810954613.7A
Authority: CN
Inventors: 苏成云; 张广瀚; 范述鑫; 宋廷彬
Original assignee: Shengrui Transmission Co Ltd
Current assignee: Shengrui Transmission Co Ltd
Priority date: 2018-08-21
Filing date: 2018-08-21
Publication date: 2024-06-11
Anticipated expiration: 2038-08-21
Also published as: CN108799441A

Abstract

The invention provides a multistage transmission, which relates to the technical field of automobiles and comprises four groups of planetary rows, six gear shifting elements, a transmission shaft and an output shaft; the transmission shaft is respectively connected with the first clutch, the second clutch and the second sun gear; the first brake is connected with the first sun gear; the first gear ring is connected with the second planet carrier; the first planet carrier is connected with the output shaft; the second gear ring is connected with the third planet carrier through a fourth shaft, and the fourth shaft is connected with the first clutch; the third sun gear is connected with a third brake through a fifth shaft, and the fifth shaft is connected with a second clutch; the third gear ring is connected with the first planet carrier; the third planet carrier is connected with a second brake; the fourth sun gear is connected with a fourth brake; the multistage transmission has the advantages of higher efficiency, larger torque load, smaller structure and smaller occupied space, and can be suitable for vehicles with compact structures.

Description

Multi-speed transmission

Technical Field

The invention relates to the technical field of automobiles, in particular to a multistage transmission.

Background

A transmission is a mechanism for changing rotational speed and torque from an engine that is capable of fixed or stepped changes in the output shaft and input shaft gear ratios, also known as a gearbox. The speed variator consists of speed-changing driving mechanism and operating mechanism, and some automobiles also have power output mechanism. Most of the transmission mechanisms are driven by common gears, and other transmission mechanisms are driven by planetary gears.

In the prior art, the transmission embodiments are all arranged with three planetary gear sets directly in succession, with four or other shift elements being arranged in part directly before or after the coupled planetary gear sets.

However, the transmission has low efficiency, large torque load and large structure, and cannot be applied to a compact vehicle.

Disclosure of Invention

The invention aims to provide a multistage transmission, which aims to solve the technical problems that the transmission in the prior art is low in efficiency, high in torque load and high in structure and cannot be suitable for a compact-structure vehicle.

The invention provides a multistage transmission, which comprises a transmission shell, a first planetary row, a second planetary row, a third planetary row, a fourth planetary row, a first brake, a second brake, a third brake, a fourth brake, a first clutch, a second clutch, a transmission shaft and an output shaft, wherein the first clutch is connected with the transmission shell;

A first planetary row, a second planetary row, a third planetary row, and a fourth planetary row; the first brake, the second brake, the third brake, the fourth brake, the first clutch and the second clutch are all arranged in the transmission shell; the first brake, the second brake, the third brake and the fourth brake are respectively and fixedly connected with the gearbox shell;

The third brake and the fourth brake are arranged in the first section; the second brake and the fourth planet row are arranged in the second section; the third planet row is arranged in the third section; the first clutch and the second clutch are arranged in the fourth section; the second planet row is arranged in the fifth section; the first row of satellites is arranged in the sixth cross section; the first brake is arranged in the seventh section;

The first planet row comprises a first sun gear, a first planet carrier and a first gear ring; the second planet row comprises a second sun gear, a second planet carrier and a second gear ring; the third planetary row comprises a third sun gear, a third planetary gear, a third planet carrier and a third gear ring; the fourth planetary gear comprises a fourth sun gear and a fourth planetary gear; the fourth planetary gear is coaxially arranged with the third planetary gear, and is fixedly connected with the third planetary gear; the fourth planetary gear is fixedly connected to the third planetary carrier;

The transmission shaft is respectively connected with the first clutch, the second clutch and the second sun gear; the first brake is connected with the first sun gear through a first shaft; the first gear ring is connected with the second planet carrier through a second shaft; the first planet carrier is connected with the output shaft through a third shaft; the second gear ring is connected with the third planet carrier through a fourth shaft, and the fourth shaft is connected with the first clutch; the third sun gear is connected with a third brake through a fifth shaft, and the fifth shaft is connected with a second clutch; the third gear ring is connected with the first planet carrier through a sixth shaft; the third planet carrier is connected with a second brake through a seventh shaft; the fourth sun gear is connected with a fourth brake through an eighth shaft;

the multi-speed transmission further includes an oil pump and a pump driver; the oil pump and the pump driver are arranged inside the gearbox shell; the pump driver is connected with the oil pump.

Further, the multi-speed transmission further includes a torque converter;

The hydraulic torque converter is arranged inside the transmission shell; the hydraulic torque converter is respectively connected with the input ends of the engine and the transmission shaft.

Further, the multistage transmission further comprises a dual-mass flywheel and a mixing module;

The mixing module and the dual-mass flywheel are both arranged in the transmission shell; the mixing module and the dual-mass flywheel are both connected with the input end of the transmission shaft.

Further, the multi-speed transmission further comprises a parking ratchet wheel;

The parking ratchet wheel is connected with the sixth shaft.

Further, the first clutch and the second clutch are double cone clutches.

Further, the first clutch and the second clutch are tooth clutches.

Further, the multi-speed transmission further includes an electric pump;

the electric pump is arranged inside the gearbox shell; the electric pump is connected with the oil pump in parallel, and the electric pump is connected with the hydraulic control system.

Further, the multi-speed transmission further includes an accumulator;

The energy accumulator is arranged in the gearbox shell; the energy accumulator is connected with the oil pump in parallel, and the energy accumulator is connected with the hydraulic control system.

Further, a shell partition board is arranged in the gearbox shell;

the shell partition plate is arranged on one side of the first section away from the second section; the second brake, the third brake and the fourth brake are all connected with the shell partition plate.

Further, a turbine of the torque converter is connected to the propeller shaft via a ninth shaft.

In the use process of the multistage transmission provided by the invention, the oil pump supplies oil to the hydraulic control system through the pump driver, and the transmission shaft rotates to drive the speed change assembly to move so as to finish gear shifting operation. The shafts between the individual components of the multi-stage transmission are shortest, so that the shafts lying one another can be as few as possible and the available installation space in the individual cross sections can be optimally utilized.

From the above, the multistage transmission has higher efficiency, larger torque load, smaller structure and smaller occupied space, and can be suitable for a compact-structure vehicle.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic structural view of a multistage transmission provided with a torque converter according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a multi-speed transmission provided with a dual mass flywheel and a hybrid module according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a gear shift logic of a multi-speed transmission according to an embodiment of the present invention.

Icon: 1-a transmission housing; 2-a first row of satellites; 3-a second planet row; 4-a third planet row; 5-fourth planet row; 6-a transmission shaft; 7-an output shaft; 8-a first section; 9-a second section; 10-third section; 11-fourth section; 12-fifth section; 13-sixth cross section; 14-seventh cross section; 15-eighth section; 16-an oil pump; 17-a pump driver; 18-a parking ratchet; 19-a first axis; 20-second axis; 21-a third axis; 22-fourth axis; 23-fifth axis; 24-sixth axis; 25-seventh axis; 26-eighth axis; 27-ninth axis; 28-an electric pump; 29-torque converter; 30-a housing separator; 31-a dual mass flywheel; 32-a mixing module; 33-an electric motor; 201-a first sun gear; 202-a first planetary gear; 203-a first planet carrier; 204-a first ring gear; 301-a second sun gear; 302-a second planetary gear; 303-a second planet carrier; 304-a second ring gear; 401-a third sun gear; 402-third planetary gear; 403-third planet carrier; 404-a third ring gear; 501-a fourth sun gear; 502-fourth planetary gear; 2901-turbine; 2902-pump wheel; 2903-guide wheels; b1-a first brake; b2-a second brake; b3-third brake; b4-fourth brake; c1-a first clutch; a C2-second clutch; c0-third clutch.

Detailed Description

The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that, if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are used, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, only for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the indicated apparatus or element must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1 to 3, the multistage transmission provided by the invention comprises a transmission housing 1, a first planetary gear row 2, a second planetary gear row 3, a third planetary gear row 4, a fourth planetary gear row 5, a first brake B1, a second brake B2, a third brake B3, a fourth brake B4, a first clutch C1, a second clutch C2, a torque converter 29, a transmission shaft 6 and an output shaft 7;

A first planetary row 2, a second planetary row 3, a third planetary row 4, a fourth planetary row 5; the first brake B1, the second brake B2, the third brake B3, the fourth brake B4, the first clutch C1 and the second clutch C2 are all provided inside the transmission case 1; the first brake B1, the second brake B2, the third brake B3 and the fourth brake B4 are respectively and fixedly connected with the gearbox shell;

the third brake B3 and the fourth brake B4 are arranged in the first section 8; the second brake B2 and the fourth planetary row 5 are arranged in a second section 9; the third planet row 4 is arranged in a third section 10; the first clutch C1 and the second clutch C2 are arranged in the fourth section 11; the second planet row 3 is arranged in the fifth section 12; the first row of satellites 2 is arranged in a sixth section 13; the first brake B1 is provided in the seventh section 14;

the first row 2 includes a first sun gear 201, a first sun gear 202, a first carrier 203, and a first ring gear 204; the second planetary gear set 3 includes a second sun gear 301, a second sun gear 302, a second carrier 303, and a second ring gear 304; the third planetary gear set 4 includes a third sun gear 401, a third planetary gear 402, a third carrier 403, and a third ring gear 404; the fourth planetary gear set 5 includes a fourth sun gear 501 and a fourth planetary gear 502; the fourth planetary gear 502 is coaxially arranged with the third planetary gear 402, and the fourth planetary gear 502 is fixedly connected with the third planetary gear 402; the fourth planetary gear 502 is fixedly connected to the third planetary carrier 403;

The transmission shaft 6 is connected with the first clutch C1, the second clutch C2 and the second sun gear 301 respectively; the first brake B1 is connected to the first sun gear 201 via the first shaft 19; the first ring gear 204 is connected to the second carrier 303 through the second shaft 20; the first planet carrier 203 is connected with the output shaft 7 through a third shaft 21; the second ring gear 304 is connected to the third carrier 403 through the fourth shaft 22, and the fourth shaft 22 is connected to the first clutch C1; the third sun gear 401 is connected to the third brake B3 via the fifth shaft 23, and the fifth shaft 23 is connected to the second clutch C2; the third ring gear 404 is connected to the first carrier 203 via the sixth shaft 24; the third carrier 403 is connected to the second brake B2 through the seventh shaft 25; the fourth sun gear 501 is connected to the fourth brake B4 via the eighth shaft 26;

the multistage transmission further includes an oil pump 16 and a pump driver 17; the oil pump 16 and the pump driver 17 are provided inside the transmission housing; the pump driver 17 is connected to the oil pump 16.

The specific gear shifting operation is as follows:

R gear: the second brake B2 is closed; the first brake B1, the third brake B3, the fourth brake B4, the first clutch C1, and the second clutch C2 are released;

First gear: the first brake B1 and the second brake B2 are closed; the third brake B3, the fourth brake B4, the first clutch C1, and the second clutch C2 are released;

Second gear: the first brake B1 and the fourth brake B4 are closed; the second brake B2, the third brake B3, the first clutch C1, and the second clutch C2 are released;

Third gear: the first brake B1 and the third brake B3 are closed; the second brake B2, the fourth brake B4, the first clutch C1, and the second clutch C2 are released;

Fourth gear: the first brake B1 and the second clutch C2 are closed; the second brake B2, the third brake B3, the fourth brake B4, and the first clutch C1 are released;

fifth gear: the first brake B1 and the first clutch C1 are closed; the second brake B2, the third brake B3, the fourth brake B4, and the second clutch C2 are released;

Sixth gear: the first clutch C1 and the second clutch C2 are closed; the first brake B1, the second brake B2, the third brake B3, and the fourth brake B4 are released;

seventh gear: the third brake B3 and the first clutch C1 are closed; the first brake B1, the second brake B2, the fourth brake B4, and the second clutch C2 are released;

eighth gear: the fourth brake B4 and the first clutch C1 are closed; the first brake B1, the second brake B2, the third brake B3, and the second clutch C2 are released.

The multi-speed transmission has eight forward gears and a gear ratio range 8.167.

In the multi-stage transmission provided in this embodiment, during the use process, the oil pump 16 supplies oil through the hydraulic control system of the pump driver 17, and the transmission shaft 6 rotates to drive the transmission assembly to move so as to complete the gear shifting operation. The shafts between the individual components of the multi-stage transmission are shortest, so that the shafts lying one another can be as few as possible and the available installation space in the individual cross sections can be optimally utilized.

As shown in fig. 1, further, in addition to the above embodiment, the multistage transmission further includes a torque converter 29;

The torque converter 29 is provided inside the transmission case 1; the torque converter 29 is connected to the input of the engine and the propeller shaft 6, respectively.

Wherein the pump driver 17 supplies oil to the torque converter 29, thereby rotating the torque converter 29.

In the present embodiment, the torque converter 29 rotates to increase the torque of the propeller shaft 6.

As shown in fig. 2, further, the multi-speed transmission further includes a dual mass flywheel 31 and a hybrid module 32, based on the above embodiments;

The hybrid module 32 and the dual mass flywheel 31 are both disposed inside the transmission case 1; the mixing module 32 and the dual mass flywheel 31 are both connected with the input end of the transmission shaft 6.

Wherein the hybrid module 32 includes a motor 33 and a third clutch C0. The third clutch C0 is connected to the drive shaft 6, the dual mass flywheel 31, and the motor 33. In the use process, when the electric motor is driven, the third clutch C0 is released; when the engine is driven or mixed, the third clutch C0 is closed.

In this embodiment, the above arrangement can realize three driving modes of pure electric driving, engine driving and hybrid driving, and at the same time, the arrangement of the dual mass flywheel can also play a role in damping and increasing the torque of the transmission shaft 6.

As shown in fig. 1 and 2, further, the multi-speed transmission further includes a parking ratchet 18, as in the above embodiment;

The parking ratchet 18 is connected to a sixth shaft 24.

Wherein the parking ratchet 18 may be provided in the eighth section 15 between the fifth section 12 and the sixth section 13.

In this embodiment, the parking ratchet 18 does not require additional axial space for connection, which reduces the space occupied by the device and is more suitable for compact vehicles.

Further, on the basis of the above embodiment, the first clutch C1 and the second clutch C2 are double cone clutches; or the first clutch C1 and the second clutch C2 are tooth clutches.

In this embodiment, the double cone clutch or tooth clutch is more compact in structure, which is beneficial to reducing the occupied space of the device.

As shown in fig. 1 and 2, further to the above embodiment, the multi-speed transmission further includes an electric pump 28;

The electric pump 28 is arranged inside the gearbox housing; the electric pump 28 is disposed in parallel with the oil pump 16, and the electric pump 28 is connected with a hydraulic control system.

When the engine is automatically turned off, the electric pump 28 runs at a low speed to compensate for leakage of the hydraulic control system, lubricate the mechanical actuator, and pre-charge the clutch and brake; and, after the engine is restarted, the electric pump 28 and the oil pump 16 simultaneously supply oil to the hydraulic control system, quickly wash oil to the clutch, and ensure quick starting of the vehicle.

In this embodiment, in the starting stage, the oil pump 16 cannot reach the preset oil pressure and rotation speed, and the oil supply to the hydraulic control system cannot be completed, so the electric pump 28 is required to drive the oil pump 16 to start, and the electric pump 28 can play a role in assisting in starting.

Further, in the foregoing embodiment, the multi-speed transmission further includes an accumulator;

the energy accumulator is arranged in the gearbox shell; the accumulator is arranged in parallel with the oil pump 16 and is connected with the hydraulic control system.

The accumulator operates in the same manner as the electric pump 28 described above.

In this embodiment, in the starting stage, the oil pump 16 cannot reach the preset oil pressure and rotation speed, and the oil supply to the hydraulic control system cannot be completed, so the accumulator is required to drive the oil pump 16 to start, and the accumulator can play a role in assisting in starting.

As shown in fig. 1 and 2, further, on the basis of the above-described embodiment, the inside of the transmission case is provided with a case spacer 30;

The housing diaphragm 30 is arranged on the side of the first section 8 remote from the second section 9; the second brake B2, the third brake B3, and the fourth brake B4 are connected to the case spacer 30.

In the present embodiment, the housing diaphragm 30 provides the setting position for the second brake B2 and the third brake B3, and provides a good precondition for a compact structure.

As shown in fig. 1, further, in addition to the above-described embodiment, the turbine 2901 of the torque converter 29 is connected to the propeller shaft 6 via a ninth shaft 27.

In this embodiment, during use, the oil pump 16 supplies oil to the pump impeller 2902 of the torque converter 29 through the pump driver 17, the pump impeller 2902, the turbine impeller 2901 and the stator impeller 2093 of the torque converter 29 cooperate to perform a rotation process, and the ninth shaft 27 on the turbine impeller 2901 rotates accordingly, so as to drive the transmission shaft 6 to rotate, and the transmission shaft 6 rotates to drive the transmission assembly to move to complete a gear shifting operation.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims

1. A multi-speed transmission, comprising: a transmission housing, a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, a first brake, a second brake, a third brake, a fourth brake, a first clutch, a second clutch, a drive shaft, and an output shaft;

The first planetary gear set, the second planetary gear set, the third planetary gear set, the fourth planetary gear set, the first brake, the second brake, the third brake, the fourth brake, the first clutch and the second clutch are all arranged in a transmission shell; the first brake, the second brake, the third brake and the fourth brake are respectively and fixedly connected with the transmission shell;

the third brake and the fourth brake are disposed in a first cross section; the second brake and the fourth planetary row are disposed in a second cross section; the third planet row is arranged in a third section; the first clutch and the second clutch are disposed in a fourth cross section; the second planet row is arranged in a fifth section; the first row of satellites is arranged in a sixth cross section; the first brake is arranged in a seventh section;

The first planet row comprises a first sun gear, a first planet carrier and a first gear ring; the second planet row comprises a second sun gear, a second planet carrier and a second gear ring; the third planetary gear comprises a third sun gear, a third planetary gear, a third planet carrier and a third gear ring; the fourth planetary gear comprises a fourth sun gear and a fourth planetary gear; the fourth planetary gear is coaxially arranged with the third planetary gear, and is fixedly connected with the third planetary gear; the fourth planetary gear is fixedly connected to the third planetary carrier;

The transmission shaft is respectively connected with the first clutch, the second clutch and the second sun gear; the first brake is connected with the first sun gear through a first shaft; the first gear ring is connected with the second planet carrier through a second shaft; the first planet carrier is connected with the output shaft through a third shaft; the second gear ring is connected with the third planet carrier through a fourth shaft, and the fourth shaft is connected with the first clutch; the third sun gear is connected with the third brake through a fifth shaft, and the fifth shaft is connected with the second clutch; the third gear ring is connected with the first planet carrier through a sixth shaft; the third planet carrier is connected with the second brake through a seventh shaft; the fourth sun gear is connected with the fourth brake through an eighth shaft;

the multi-speed transmission further includes an oil pump and a pump driver; the oil pump and the pump driver are disposed inside the transmission case; the pump driver is connected with the oil pump;

The specific gear shifting operation is as follows:

r gear: the second brake is closed; the first brake, the third brake, the fourth brake, the first clutch and the second clutch are released;

First gear: the first brake and the second brake are closed; the third brake, the fourth brake, the first clutch and the second clutch are released;

second gear: the first brake and the fourth brake are closed; the second brake, the third brake, the first clutch and the second clutch are released;

Third gear: the first brake and the third brake are closed; the second brake, the fourth brake, the first clutch and the second clutch are released;

fourth gear: the first brake and the second clutch are closed; the second brake, the third brake, the fourth brake and the first clutch are released;

fifth gear: the first brake and the first clutch are closed; the second brake, the third brake, the fourth brake, and the second clutch are released;

sixth gear: the first clutch and the second clutch are closed; the first brake, the second brake, the third brake and the fourth brake are released;

seventh gear: the third brake and the first clutch are closed; the first brake, the second brake, the fourth brake and the second clutch are released;

eighth gear: the fourth brake and the first clutch are closed; the first brake, the second brake, the third brake, and the second clutch are released.

2. The multi-speed transmission of claim 1, further comprising a torque converter;

The hydraulic torque converter is arranged inside the transmission shell; the hydraulic torque converter is respectively connected with the engine and the input end of the transmission shaft.

3. The multi-speed transmission of claim 1, further comprising a dual mass flywheel and a hybrid module;

The mixing module and the dual-mass flywheel are both arranged inside the transmission shell; the mixing module and the dual-mass flywheel are both connected with the input end of the transmission shaft.

4. The multi-speed transmission of claim 1, further comprising a park ratchet;

the parking ratchet wheel is connected with the sixth shaft.

5. The multi-speed transmission of claim 1, wherein the first clutch and the second clutch are dual cone clutches.

6. The multi-speed transmission of claim 1, wherein the first clutch and the second clutch are dog clutches.

7. The multi-speed transmission of claim 1, further comprising an electric pump;

the electric pump is arranged inside the transmission shell; the electric pump is arranged in parallel with the oil pump, and is connected with the hydraulic control system.

8. The multi-speed transmission of claim 1, further comprising an accumulator;

the accumulator is arranged inside the transmission shell; the energy accumulator is connected with the oil pump in parallel, and the energy accumulator is connected with the hydraulic control system.

9. The multi-speed transmission according to any one of claims 1 to 8, wherein a case spacer is provided inside the transmission case;

10. The multi-speed transmission of claim 2, wherein the turbine of the torque converter is connected to the drive shaft by a ninth shaft.