Gearbox and gear shifting method

Abstract

The present invention relates to the field of automobile technology, and in particular to a gearbox and a shifting method, wherein the gearbox comprises a housing; a power input assembly, which is rotatably arranged on the housing; a power transmission assembly, which is rotatably arranged on the housing, and the power transmission assembly is transmission-connected with the power input assembly; a power output assembly, which is rotatably arranged on the housing, one end of which extends relative to the housing, and is transmission-connected with the power transmission assembly; a brake, which is arranged on the power transmission assembly; and a synchronizer group, which is arranged on the power output assembly. The present invention can effectively reduce the wear on the synchronizer, eliminate the tooth-splitting phenomenon of an automatic gearbox without a synchronizer under special working conditions, and improve the reliability and shifting comfort of the automatic gearbox.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a gearbox and a gear shifting method. Background Art

[0002] The manual transmission of commercial vehicles relies on synchronizers to achieve synchronization and then complete the shift. Therefore, manual transmissions have the problem of shortened machine life due to the fragility of synchronizers. The traditional automatic transmission (AMT) of commercial vehicles uses the electronic control unit to control the transmission brake (TB) to brake down and the engine to speed up to automatically adjust the speed to achieve speed synchronization. Therefore, the main box of the traditional automatic transmission cancels the synchronizer and adopts a sliding sleeve structure. However, the automatic transmission with this sliding sleeve structure will have the phenomenon of gear knocking under special vehicle working conditions.

[0003] Therefore, a gearbox and a gear shifting method are needed to solve the above technical problems. Summary of the invention

[0004] The object of the present invention is to provide a gearbox and a shifting method, which can effectively reduce the wear on the synchronizer, eliminate the gear-snapping phenomenon of an automatic gearbox without a synchronizer under special working conditions, and improve the reliability and shifting comfort of the automatic gearbox.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A gearbox, comprising:

[0007] Box;

[0008] A power input assembly, the power input assembly being rotatably disposed on the box body;

[0009] A power transmission assembly is rotatably disposed on the box body, and the power transmission assembly is drivingly connected to the power input assembly;

[0010] A power output assembly is rotatably disposed on the housing, one end of which extends relative to the housing and is transmission-connected to the power transmission assembly;

[0011] a brake, the brake being arranged on the power transmission assembly;

[0012] A synchronizer group is arranged on the power output assembly.

[0013] Furthermore, the power input assembly includes an input shaft, the input shaft is rotatably disposed on the housing, an input gear is fixedly disposed on the input shaft, and the input gear is drivingly connected to the power transmission assembly.

[0014] Further, the power transmission assembly includes an intermediate shaft, a power transmission gear and a gear input gear set, the intermediate shaft is rotatably arranged on the housing, the brake is arranged on the intermediate shaft, the power transmission gear and the gear input gear set are both fixedly arranged on the intermediate shaft, the power transmission gear is meshed with the input gear, and the gear input gear set is transmission connected to the power output assembly.

[0015] Furthermore, the power output assembly includes an output shaft and a gear output gear set, the output shaft is rotatably arranged on the housing, and one end extends relative to the housing, the synchronizer set and the gear output gear set are both arranged on the output shaft, and the gear output gear set is meshed with the gear input gear set.

[0016] Further, the gear input gear set includes a first driving gear, the gear output gear set includes a first driven gear, the synchronizer set includes a first synchronizer, the first driving gear meshes with the first driven gear, and the first synchronizer can combine the first driven gear with the output shaft.

[0017] Further, the gear input gear set includes a second driving gear, the gear output gear set includes a second driven gear, the first synchronizer is located between the first driven gear and the second driven gear, the second driving gear is meshed with the second driven gear, and the first synchronizer can combine the second driven gear with the output shaft.

[0018] Further, the gear input gear set includes a third driving gear, the gear output gear set includes a third driven gear, the synchronizer set includes a second synchronizer, the third driving gear meshes with the third driven gear, and the second synchronizer can combine the third driven gear with the output shaft.

[0019] Further, the gear input gear set includes a fourth driving gear, the gear output gear set includes a fourth driven gear, the second synchronizer is located between the third driven gear and the fourth driven gear, the fourth driving gear is meshed with the fourth driven gear, and the second synchronizer can combine the fourth driven gear with the output shaft.

[0020] Further, the gear input gear set includes a fifth driving gear, the gear output gear set includes a fifth driven gear, the synchronizer set includes a third synchronizer, the fifth driving gear meshes with the fifth driven gear, and the third synchronizer can combine the fifth driven gear with the output shaft.

[0021] A gear shifting method for a gearbox, using the gearbox as described above to shift gears, comprises the following steps:

[0022] S1: When TCU detects that a gear shift is required, it reduces the engine torque and opens the clutch to enter the gear shifting process;

[0023] S2, after entering the neutral gear, the speed regulation stage is entered, the TCU sends a command to the solenoid valve, the solenoid valve is connected to the external air source to control the brake, the brake regulates the speed of the intermediate shaft to the first set value, and issues a gear shifting command, and the synchronizer group completes the speed synchronization of the output shaft.

[0024] Beneficial effects of the present invention:

[0025] The present invention provides a gearbox and a shifting method, in which a power input assembly, a power transmission assembly and a power output assembly are rotatably arranged on a housing, wherein the power input assembly is transmission-connected with the power transmission assembly, the power transmission assembly is transmission-connected with the power output assembly, a brake is arranged on the power transmission assembly, and a synchronizer group is arranged on the power output assembly. When shifting, the brake is controlled to brake the power transmission assembly, and when the speed of the power transmission assembly approaches the target speed value, the synchronizer is controlled to perform the final speed synchronization, and finally the gear shifting of the gearbox is completed. Through the above method, on the one hand, the advantages of electronic control can be utilized to reduce the wear of the synchronizer group relative to the manual gearbox, thereby improving the reliability of the gearbox. On the other hand, by using the synchronizer group, the phenomenon of gear knocking during the gear shifting process is avoided, thereby improving the comfort of the gear shifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of a gearbox of the present invention.

[0027] In the figure:

[0028] 1. Power input assembly; 11. Input shaft; 12. Input gear; 2. Power transmission assembly; 21. Intermediate shaft; 22. Power transmission gear; 23. First driving gear; 24. Second driving gear; 25. Third driving gear; 26. Fourth driving gear; 27. Fifth driving gear; 28. Reverse driving gear; 3. Power output assembly; 31. Output shaft; 32. First driven gear; 33. Second driven gear; 34. Third driven gear; 35. Fourth driven gear; 36. Fifth driven gear; 37. Reverse driven gear; 38. Reversing gear; 4. Brake; 5. First synchronizer; 6. Second synchronizer; 7. Third synchronizer; 8. Solenoid valve; 9. TCU. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and implementation methods. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] In order to effectively reduce the wear on the synchronizer, eliminate the gear-snapping phenomenon of the automatic transmission without synchronizer under special working conditions, and improve the reliability and shifting comfort of the automatic transmission, such as Figure 1 As shown, the present invention provides a gearbox, which comprises a housing, a power input assembly 1, a power output assembly 3, a brake 4 and a synchronizer assembly.

[0033] Among them, the power input component 1 is rotatably set on the box; the power transmission component 2 is rotatably set on the box, and the power transmission component 2 is transmission connected to the power input component 1; the power output component 3 is rotatably set on the box, one end extends relative to the box, and is transmission connected to the power transmission component 2; the brake 4 is set on the power transmission component 2; the synchronizer group is set on the power output component 3.

[0034] When shifting gears, the brake 4 is controlled to brake the power transmission component 2. When the speed of the power transmission component 2 is close to the target speed value, the synchronizer is controlled to perform the final speed synchronization, and finally the gear shift of the gearbox is completed. Through the above method, on the one hand, the advantage of electronic control can be used to reduce the wear of the synchronizer group and improve the reliability of the gearbox compared to the manual gearbox. On the other hand, by using the synchronizer group, the phenomenon of gear knocking during the gear shifting process is avoided, and the gear shifting comfort is improved.

[0035] Further, the power input assembly 1 includes an input shaft 11, which is rotatably arranged on the housing, and an input gear 12 is fixedly arranged on the input shaft 11, and the input gear 12 is drivingly connected to the power transmission assembly 2. Specifically, the input shaft 11 is connected to the engine of the car to realize power input.

[0036] Further, the power transmission assembly 2 includes an intermediate shaft 21, a power transmission gear 22 and a gear input gear set, the intermediate shaft 21 is rotatably arranged on the housing, the brake 4 is arranged on the intermediate shaft 21, the power transmission gear 22 and the gear input gear set are both fixedly arranged on the intermediate shaft 21, the power transmission gear 22 is meshed with the input gear 12, and the gear input gear set is transmission-connected with the power output assembly 3. When the brake 4 is shifting, the rotation speed of the intermediate shaft 21 can be controlled to achieve speed regulation, and the power is transmitted from the input shaft 11 to the intermediate shaft 21 through the meshing of the power transmission gear 22 with the input gear 12, and the intermediate shaft 21 then transmits the power to the power output assembly 3 through the gear input gear set.

[0037] Furthermore, the power output assembly 3 includes an output shaft 31 and a gear output gear set. The output shaft 31 is rotatably arranged on the housing, and one end thereof extends relative to the housing. The synchronizer set and the gear output gear set are both arranged on the output shaft 31, and the gear output gear set meshes with the gear input gear set. Specifically, the gear output gear set is loosely sleeved on the output shaft 31. When a gear shift is required, the corresponding synchronizer is controlled to be connected to the corresponding gear output gear to achieve the corresponding gear shift.

[0038] Specifically, the gear input gear set includes a first driving gear 23, the gear output gear set includes a first driven gear 32, the synchronizer set includes a first synchronizer 5, the first driving gear 23 is meshed with the first driven gear 32, and the first synchronizer 5 can combine the first driven gear 32 with the output shaft 31. When the first gear is engaged, the first synchronizer 5 is controlled to complete the final speed synchronization, so that the first driven gear 32 is connected to the output shaft 31 through the first synchronizer 5 to achieve power output.

[0039] Further, the gear input gear set includes a second driving gear 24, the gear output gear set includes a second driven gear 33, the first synchronizer 5 is located between the first driven gear 32 and the second driven gear 33, the second driving gear 24 is meshed with the second driven gear 33, and the first synchronizer 5 can combine the second driven gear 33 with the output shaft 31. When the second gear is engaged, the first synchronizer 5 is controlled to combine with the second driven gear 33 to complete the final speed synchronization, so that the second driven gear 33 is connected to the output shaft 31 through the first synchronizer 5 to achieve power output.

[0040] Further, the gear input gear set includes a third driving gear 25, the gear output gear set includes a third driven gear 34, the synchronizer set includes a second synchronizer 6, the third driving gear 25 is meshed with the third driven gear 34, and the second synchronizer 6 can combine the third driven gear 34 with the output shaft 31. When the third gear is engaged, the second synchronizer 6 is controlled to combine with the third driven gear 34 to complete the final speed synchronization, so that the third driven gear 34 is connected to the output shaft 31 through the second synchronizer 6 to achieve power output.

[0041] Further, the gear input gear set includes a fourth driving gear 26, the gear output gear set includes a fourth driven gear 35, the second synchronizer 6 is located between the third driven gear 34 and the fourth driven gear 35, the fourth driving gear 26 is meshed with the fourth driven gear 35, and the second synchronizer 6 can combine the fourth driven gear 35 with the output shaft 31. When the fourth gear is engaged, the second synchronizer 6 is controlled to combine with the fourth driven gear 35 to complete the final speed synchronization, so that the fourth driven gear 35 is connected to the output shaft 31 through the second synchronizer 6 to achieve power output.

[0042] Further, the gear input gear set includes a fifth driving gear 27, the gear output gear set includes a fifth driven gear 36, the synchronizer set includes a third synchronizer 7, the fifth driving gear 27 is meshed with the fifth driven gear 36, and the third synchronizer 7 can combine the fifth driven gear 36 with the output shaft 31. When the fifth gear is engaged, the third synchronizer 7 is controlled to combine with the fifth driven gear 36 to complete the final speed synchronization, so that the fifth driven gear 36 is connected to the output shaft 31 through the third synchronizer 7 to achieve power output.

[0043] Further, the gear input gear set includes a reverse gear driving gear 28, the gear output gear set includes a reverse gear driven gear 37, the third synchronizer 7 is located between the fifth driven gear 36 and the reverse gear driven gear 37, the reverse gear driving gear 28 is meshed with the reverse gear driven gear 37 through the reversing gear 38, and the third synchronizer 7 can combine the reverse gear driven gear 37 with the output shaft 31. The reversing gear 38 is provided to change the rotation direction of the reverse gear driven gear 37, thereby changing the rotation direction of the output shaft 31, and realizing power output.

[0044] This embodiment also provides a gear shifting method of a gearbox, which uses the gearbox as described above to shift gears, including the following steps:

[0045] When S1 and TCU9 (Transmission Control Unit) detect that a gear shift is required, the engine torque is reduced and the clutch is opened to enter the gear shifting process;

[0046] S2, after the neutral gear enters the speed regulation stage, TCU9 sends a command to the solenoid valve 8, the solenoid valve 8 connects to the external air source to control the brake 4, the brake 4 regulates the speed of the intermediate shaft 21, regulates the speed to the first set value, issues a gear shift command, and the synchronizer group completes the speed synchronization of the output shaft. Specifically, the brake 4 completes 70% of the speed regulation of the intermediate shaft 31, and then the synchronizer group completes the subsequent 30% of the speed synchronization to complete the gear shift.

[0047] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A gearbox, characterized in that: include: Box; A power input assembly (1), the power input assembly (1) being rotatably disposed on the box body; A power transmission component (2) is rotatably disposed on the box body, and the power transmission component (2) is drivingly connected to the power input component (1); A power output assembly (3) is rotatably mounted on the housing, one end of which extends relative to the housing and is drivingly connected to the power transmission assembly (2); a brake (4), wherein the brake (4) is arranged on the power transmission component (2); A synchronizer group, the synchronizer group being arranged on the power output assembly (3); The power input assembly (1) comprises an input shaft (11), the input shaft (11) is rotatably arranged on the housing, an input gear (12) is fixedly arranged on the input shaft (11), and the input gear (12) is drivingly connected to the power transmission assembly (2); The power transmission assembly (2) comprises an intermediate shaft (21), a power transmission gear (22) and a gear input gear set, the intermediate shaft (21) is rotatably arranged on the housing, the brake (4) is arranged on the intermediate shaft (21), the power transmission gear (22) and the gear input gear set are both fixedly arranged on the intermediate shaft (21), the power transmission gear (22) is meshed with the input gear (12), and the gear input gear set is drivingly connected to the power output assembly (3); When shifting gears, the brake (4) is controlled to brake the power transmission component (2), and when the rotation speed of the power transmission component (2) approaches the target rotation speed value, the synchronizer is controlled to perform final speed synchronization, thereby finally completing the gear shift of the transmission; The power output assembly (3) comprises an output shaft (31) and a gear output gear set, wherein the output shaft (31) is rotatably arranged on the housing and one end of the output shaft extends relative to the housing, the synchronizer set and the gear output gear set are both arranged on the output shaft (31), and the gear output gear set is meshed with the gear input gear set; The gear input gear set includes a first driving gear (23), the gear output gear set includes a first driven gear (32), the synchronizer set includes a first synchronizer (5), the first driving gear (23) is meshed with the first driven gear (32), and the first synchronizer (5) can enable the first driven gear (32) to be combined with the output shaft (31); The gear input gear set includes a third driving gear (25), the gear output gear set includes a third driven gear (34), the synchronizer set includes a second synchronizer (6), the third driving gear (25) is meshed with the third driven gear (34), and the second synchronizer (6) can enable the third driven gear (34) to be combined with the output shaft (31).

2. A gearbox according to claim 1, characterized in that: The gear input gear set includes a second driving gear (24), the gear output gear set includes a second driven gear (33), the first synchronizer (5) is located between the first driven gear (32) and the second driven gear (33), the second driving gear (24) is meshed with the second driven gear (33), and the first synchronizer (5) can enable the second driven gear (33) to be combined with the output shaft (31).

3. A gearbox according to claim 1, characterized in that: The gear input gear set includes a fourth driving gear (26), the gear output gear set includes a fourth driven gear (35), the second synchronizer (6) is located between the third driven gear (34) and the fourth driven gear (35), the fourth driving gear (26) is meshed with the fourth driven gear (35), and the second synchronizer (6) can enable the fourth driven gear (35) to be combined with the output shaft (31).

4. A gearbox according to claim 1, characterized in that: The gear input gear set includes a fifth driving gear (27), the gear output gear set includes a fifth driven gear (36), the synchronizer set includes a third synchronizer (7), the fifth driving gear (27) is meshed with the fifth driven gear (36), and the third synchronizer (7) can enable the fifth driven gear (36) to be combined with the output shaft (31).

5. A gear shifting method for a gearbox, characterized in that: Shifting gears using the gearbox according to any one of claims 1 to 4 comprises the following steps: When S1 and TCU (9) detect that a gear shift is required, the engine torque is reduced and the clutch is opened at the same time, and the gear shifting process begins; S2, after the neutral gear is reached, the speed regulation stage is entered, the TCU (9) sends a command to the solenoid valve (8), the solenoid valve (8) is connected to the external air source to control the brake (4), the brake (4) regulates the speed of the intermediate shaft (21), regulates the speed to the first set value, issues a gear shift command, and the synchronizer group completes the speed synchronization of the output shaft (31).

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