A gearbox shift control system

Abstract

The application discloses a gearbox shift control system, which comprises a gearbox shift actuator and a pneumatic shift combined control valve. The pneumatic shift combined control valve comprises a shell, a valve shaft, a first valve body, a second valve body and a third valve body. The valve shaft is installed in the shell, and the first valve body, the second valve body and the third valve body are installed on the shell. The first valve shaft is provided with a first cam for driving the first valve body to act, a second cam for driving the second valve body to act and a third cam for driving the third valve body to act. The first valve body is provided with a B1 working port, an F1 working port and a P1 air inlet. The second valve body is provided with an M2 working port and a B2 working port. The third valve body is provided with an M3 working port, an L3 working port and an R3 working port. The B working port is communicated with the B1 working port and the B2 working port. The M working port is communicated with the M2 working port and the M3 working port. The F working port is communicated with the F1 working port. The gearbox automatic shift is realized by using the air source, the selection and shift response and the precision of the automatic gearbox are improved, the structure is ingenious and the practicality is high.

Description

Technical Field

[0001] This invention relates to the field of machinery, and in particular to a gearbox shift control system. Background Technology

[0002] Manual transmissions, characterized by high efficiency, low cost, and mature manufacturing processes, still hold a significant market share. However, manual transmissions suffer from drawbacks such as difficult shifting, power interruption, and the significant impact of driver skill on vehicle performance. Furthermore, the frequent manual shifting can easily lead to driver fatigue, increasing safety risks. Therefore, automatic transmissions have replaced manual transmissions as the mainstream. However, while automatic transmissions offer comfort and convenience, they also suffer from higher fuel consumption, higher costs, and greater maintenance difficulties. In this context, the automated manual transmission (AMT) emerged.

[0003] Currently, automatic transmissions use permanent magnet synchronous brushless DC motors for gear selection and shifting. The output mechanical motion is rotary, which needs to be converted into linear motion through a mechanical structure for gear selection and shifting. This results in unavoidable problems such as slow shifting response and low mechanical efficiency.

[0004] In summary, there is still a lack of effective solutions in the existing technology for improving the shift response and accuracy of automatic transmissions. Summary of the Invention

[0005] In view of this, the present invention proposes a gearbox shift control system that uses an air source to realize automatic gearbox shifting, thereby improving the shifting response and accuracy of the automatic gearbox. The system has an ingenious structure and strong practicality.

[0006] On one hand, the present invention provides a gearbox shift control system, including a gearbox shift actuator and a pneumatic shift combination control valve. The gearbox shift actuator includes a shift fork shaft mounted on the right side of the housing, and a shift fork mounted on the shift fork shaft. The system is characterized by having a first cavity, a second cavity, and a third cavity within the housing; a first piston positioned between the first and second cavities; a second piston positioned between the second and third cavities; the first and second pistons being coaxially arranged; the first piston being connected to the shift fork shaft; and the second piston being mounted on the left side of the housing. The housing has a B working port, an F working port, and an M working port. The B working port communicates with the first cavity, the F working port communicates with the second cavity, and the M working port communicates with the third cavity. The effective working area of ​​the first piston is smaller than that of the second piston. A right-end limiting step is provided between the second and third cavities. When the second piston abuts against the right-end limiting step, the left end of the shift fork shaft abuts against the second piston.

[0007] The air pressure gear shift combination control valve comprises a shell, a valve shaft, a first valve body, a second valve body and a third valve body, the valve shaft is installed in the shell, the first valve body, the second valve body and the third valve body are installed on the shell, the first valve body, the second valve body and the third valve body are installed on the valve shaft, a first cam for driving the first valve body to act, a second cam for driving the second valve body to act and a third cam for driving the third valve body to act are installed on the valve shaft, a B1 working port, a F1 working port and a P1 inlet are formed on the first valve body, a M2 working port and a B2 working port are formed on the second valve body, a M3 working port, a L3 working port and a R3 working port are formed on the third valve body, the B working port is communicated with the B1 working port and the B2 working port, the M working port is communicated with the M2 working port and the M3 working port, and the F working port is communicated with the F1 working port.

[0008] Further, the gear shift execution mechanism of the gearbox comprises an execution valve, a shift fork gear is arranged on the shift fork, a rack is arranged on the execution valve, the shift fork gear is engaged with the rack, and the execution valve drives the shift fork to deflect; an L working port and an R working port are arranged on the execution valve, when the air source enters the execution valve from the L working port, the shift fork is pushed to deflect downward to enter the low speed gear shift area, and when the air source enters the execution valve from the R working port, the shift fork is pushed to deflect upward to enter the high speed gear shift area; the L working port is communicated with the L3 working port, and the R working port is communicated with the R3 working port.

[0009] Further, the air pressure gear shift combination control valve comprises a gear shift switch, a valve gear is installed on the valve shaft, a gear shift gear is installed on the gear shift switch, the gear shift gear is engaged with the valve gear, and a gear position indicator disc is installed on the valve shaft.

[0010] Further, the air pressure gear shift combination control valve comprises a positioning wheel installed on the valve shaft, a positioning adjusting bolt, a positioning spring and a positioning ball are installed on the shell, the positioning ball abuts against the positioning wheel, and the positioning spring has two ends respectively abutting against the positioning ball and the positioning adjusting bolt.

[0011] Further, the air pressure gear shift combination control valve comprises a first gear position, a second gear position, a third gear position, a fourth gear position, a fifth gear position and a sixth gear position; the first gear position is a low speed gear position, the second gear position is a sub-low speed gear position, the third gear position is a low speed neutral gear position, the fourth gear position is a fast neutral gear position, the fifth gear position is a sub-fast gear position, and the sixth gear position is a fast gear position; the first gear position, the second gear position, the third gear position, the fourth gear position, the fifth gear position and the sixth gear position are arranged in sequence.

[0012] Further, when the gear shift switch is turned to the first gear position, the P1 inlet is communicated with the B1 working port; the air source enters the first cavity from the P1 inlet, the B1 working port and the B working port in sequence, pushes the first piston to move left, the shift fork shaft moves left to push the second piston to the left end, the shift fork moves to the left end, and the gearbox is engaged in the first gear position;

[0013] When the shift switch is switched from the first gear to the second gear, the P1 inlet communicates with the F1 working port; the air source enters the second cavity from the P1 inlet, the F1 working port, the F working port in turn to push the first piston to move right, the shift fork shaft moves right to drive the shift fork to move to the right end, and the gearbox is engaged into the second gear;

[0014] When the shift switch is switched from the second gear to the third gear, the P1 inlet communicates with the B1 working port, the M2 working port communicates with the B2 working port, and the M3 working port communicates with the L3 working port; part of the air source enters the execution valve from the P1 inlet, the B1 working port, the B2 working port, the M2 working port, the M3 working port, the L3 working port, and the L working port to push the shift fork to deflect downward into the low-speed gear area; part of the air source enters the third cavity from the P1 inlet, the B1 working port, the B2 working port, the M2 working port, the M3 working port, and the M working port in turn to push the second piston to move right; part of the air source enters the first cavity from the P1 inlet, the B1 working port, the B2 working port, and the B working port in turn to push the first piston to move left; since the effective acting area of the first piston is smaller than that of the second piston, the second piston abuts against the right end limiting step of the second piston, the left end of the shift fork shaft abuts against the second piston, the shift fork is in the intermediate position, and the gearbox is engaged into the third gear;

[0015] When the shift switch is switched from the third gear to the fourth gear, the P1 inlet communicates with the B1 working port, the M2 working port communicates with the B2 working port, and the M3 working port communicates with the R3 working port; part of the air source enters the execution valve from the P1 inlet, the B1 working port, the B2 working port, the M2 working port, the M3 working port, the R3 working port, and the R working port to push the shift fork to deflect upward into the high-speed gear area; part of the air source enters the third cavity from the P1 inlet, the B1 working port, the B2 working port, the M2 working port, the M3 working port, and the M working port in turn to push the second piston to move right; part of the air source enters the first cavity from the P1 inlet, the B1 working port, the B2 working port, and the B working port in turn to push the first piston to move left; since the effective acting area of the first piston is smaller than that of the second piston, the second piston abuts against the right end limiting step of the second piston, the left end of the shift fork shaft abuts against the second piston, the shift fork is in the intermediate position, and the gearbox is engaged into the fourth gear;

[0016] When the shift switch is switched from the fourth gear to the fifth gear, the P1 inlet communicates with the F1 working port; the air source enters the second cavity from the P1 inlet, the F1 working port, and the F working port in turn to push the first piston to move right, the shift fork shaft moves right to drive the shift fork to move to the right end, and the gearbox is engaged into the fifth gear;

[0017] When the shift switch is shifted from the fifth gear to the sixth gear, the P1 inlet communicates with the B1 working port; the air source enters the first cavity from the P1 inlet, the B1 working port and the B working port in sequence to push the first piston to move left, the fork shaft moves left to push the second piston to the left end, the gear fork moves to the left end, and the gearbox is engaged in the sixth gear.

[0018] The gearbox shift control system of the present application has the following advantages over the prior art:

[0019] 1. The compressed air has a fast response speed, and the air source is used to realize automatic shifting of the gearbox, thereby improving the response and precision of the automatic gearbox.

[0020] 2. The gearbox shift control system of the present application has six gears and can automatically select and shift gears, and has a clever structure and strong practicability. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and the illustrative embodiments thereof and their descriptions serve to explain the present application, and do not constitute an improper limitation of the present application. In the drawings:

[0022] Figure 1 The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and the illustrative embodiments thereof and their descriptions serve to explain the present application, and do not constitute an improper limitation of the present application. In the drawings: DETAILED DESCRIPTION

[0023] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] As shown in Figure 1 The present application provides a gearbox shift control system, which comprises a gearbox shift actuator and a gas pressure shift combined control valve.

[0025] The gearbox shift actuator is provided with a shift fork shaft 11 mounted on the right side in the housing 10, a shift fork 12 mounted on the shift fork shaft 11, a first cavity 14, a second cavity 15 and a third cavity 16 arranged in the housing 10, a first piston 18 arranged between the first cavity 14 and the second cavity 15, a second piston 17 arranged between the second cavity 15 and the third cavity 16, the first piston 18 coaxially arranged with the second piston 17, the first piston 18 connected with the shift fork shaft 11, the second piston 17 mounted on the left side in the housing 10, the housing 10 provided with a B working port, an F working port and an M working port, the B working port communicated with the first cavity 14, the F working port communicated with the second cavity 15, and the M working port communicated with the third cavity 16. The effective acting area of the first piston 18 is smaller than that of the second piston 17, so that the thrust of the first piston 18 is smaller than that of the second piston 17 under the same gas source pressure. The second piston 17 is provided with a right end limiting step 19 arranged between the second cavity 15 and the third cavity 16, and when the second piston 17 abuts against the right end limiting step 19, the left end of the shift fork shaft 11 abuts against the second piston 17.

[0026] The gearbox shift actuator comprises an execution valve 13, a shift fork gear 120 arranged on the shift fork 12, a rack 130 arranged on the execution valve 13, the shift fork gear 120 engaged with the rack 130, and the execution valve 13 drives the shift fork 12 to deflect; the execution valve 13 is provided with an L working port and an R working port, when the gas source enters the execution valve 13 through the L working port to push the shift fork 12 to deflect downward to enter the low speed gear area, and when the gas source enters the execution valve 13 through the R working port to push the shift fork 12 to deflect upward to enter the high speed gear area.

[0027] The gas pressure shift combined control valve comprises a housing 20, a valve shaft 21, a first valve body 24, a second valve body 25 and a third valve body 26, the valve shaft 21 mounted in the housing 20, the first valve body 24, the second valve body 25 and the third valve body 26 mounted on the housing 20, the valve shaft 21 provided with a first cam 212 for pushing the first valve body 24 to act, a second cam 211 for pushing the second valve body 25 to act and a third cam 214 for pushing the third valve body 26 to act. The first valve body 24 is provided with a B1 working port, an F1 working port and a P1 gas inlet; the second valve body 25 is provided with an M2 working port and a B2 working port; and the third valve body 26 is provided with an M3 working port, an L3 working port and an R3 working port. The B1 working port and the B2 working port are communicated through a gas pipe, and the M2 working port and the M3 working port are communicated through a gas pipe. The valve shaft 21 is provided with a positioning wheel 213, the housing 20 is provided with a positioning adjusting bolt 27, a positioning spring 28 and a positioning ball 29, and the positioning ball 29 abuts against the positioning wheel 213, and the two ends of the positioning spring 28 abut against the positioning ball 29 and the positioning adjusting bolt 27 respectively.

[0028] The air pressure gear shift combination control valve comprises a gear shift switch 23, a valve gear 210 installed on a valve shaft 21, a gear shift gear 230 installed on the gear shift switch 23, the gear shift gear 230 being engaged with the valve gear 210. A gear position indicating disc 215 is installed on the valve shaft 21. The gear position indicating disc 215 is marked with a first gear position, a second gear position, a second gear position, a third gear position, a fourth gear position, a fifth gear position, and a sixth gear position, the first gear position being a low speed gear position, the second gear position being a sub-low speed gear position, the third gear position being a low speed neutral gear position, the fourth gear position being a fast neutral gear position, the fifth gear position being a sub-fast gear position, and the sixth gear position being a fast gear position; the first gear position, the second gear position, the third gear position, the fourth gear position, the fifth gear position, and the sixth gear position are arranged in sequence. The first gear position, the second gear position, and the third gear position belong to low speed area gear positions; the fourth gear position, the fifth gear position, and the sixth gear position belong to fast area gear positions; the low speed area gear positions can be converted to each other, and the fast area gear positions can be converted to each other; if the gear position is converted from the fast area gear position to the low speed area gear position, the gear position must be first converted from the fast neutral gear position to the low speed neutral gear position, and then from the low speed neutral gear position to the low speed area gear position; if the gear position is converted from the low speed gear position to the fast area gear position, the gear position must be first converted from the low speed neutral gear position to the fast neutral gear position, and then from the fast neutral gear position to the fast area gear position.

[0029] When the gear shift switch 23 is shifted to the first gear position, the P1 inlet is communicated with the B1 working port; the air source enters the first cavity 14 from the P1 inlet, the B1 working port, and the B working port in sequence to push the first piston 18 to move leftwards, the fork shaft 11 moves leftwards to push the second piston 17 to the left end, the gear shift fork 12 moves to the left end, and the gearbox is engaged in the first gear position.

[0030] When the gear shift switch is shifted from the first gear position to the second gear position, the P1 inlet is communicated with the F1 working port; the air source enters the second cavity 15 from the P1 inlet, the F1 working port, and the F working port in sequence to push the first piston 18 to move rightwards, the fork shaft 11 moves rightwards to drive the gear shift fork 12 to move to the right end, and the gearbox is engaged in the second gear position.

[0031] When the shift switch is shifted from the second gear to the third gear, the P1 inlet communicates with the B1 working port, the M2 working port communicates with the B2 working port, and the M3 working port communicates with the L3 working port; a part of the gas source enters the execution valve from the P1 inlet, the B1 working port, the B2 working port, the M2 working port, the M3 working port, the L3 working port and the L working port to push the gear shift fork 12 to deflect downward into the low-speed gear area; a part of the gas source enters the third cavity 16 from the P1 inlet, the B1 working port, the B2 working port, the M2 working port, the M3 working port and the M working port in turn to push the second piston 17 to move right; a part of the gas source enters the first cavity 14 from the P1 inlet, the B1 working port, the B2 working port and the B working port in turn to push the first piston 18 to move left; since the effective area of the first piston 18 is smaller than the effective area of the second piston 17, the second piston 17 abuts against the right end limiting step 19 of the second piston, the left end of the shift fork shaft 11 abuts against the second piston 17, the gear shift fork 12 is in the intermediate position, and the gearbox is engaged in the third gear;

[0032] When the shift switch is shifted from the third gear to the fourth gear, the P1 inlet communicates with the B1 working port, the M2 working port communicates with the B2 working port, and the M3 working port communicates with the R3 working port; a part of the gas source enters the execution valve from the P1 inlet, the B1 working port, the B2 working port, the M2 working port, the M3 working port, the R3 working port and the R working port to push the gear shift fork 12 to deflect upward into the high-speed gear area; a part of the gas source enters the third cavity 16 from the P1 inlet, the B1 working port, the B2 working port, the M2 working port, the M3 working port and the M working port in turn to push the second piston 17 to move right; a part of the gas source enters the first cavity 14 from the P1 inlet, the B1 working port, the B2 working port and the B working port in turn to push the first piston 18 to move left; since the effective area of the first piston 18 is smaller than the effective area of the second piston 17, the second piston 17 abuts against the right end limiting step 19 of the second piston, the left end of the shift fork shaft 11 abuts against the second piston 17, the gear shift fork 12 is in the intermediate position, and the gearbox is engaged in the fourth gear;

[0033] When the shift switch is shifted from the fourth gear to the fifth gear, the P1 inlet communicates with the F1 working port; the gas source enters the second cavity 15 from the P1 inlet, the F1 working port and the F working port in turn to push the first piston 17 to move right, the shift fork shaft 11 moves right to drive the gear shift fork 12 to move to the right end, and the gearbox is engaged in the fifth gear;

[0034] When the shift switch is shifted from the fifth gear to the sixth gear, the P1 inlet communicates with the B1 working port; the gas source enters the first cavity 14 from the P1 inlet, the B1 working port and the B working port in turn to push the first piston 18 to move left, the shift fork shaft 11 moves left to push the second piston 17 to the left end, the gear shift fork 12 moves to the left end, and the gearbox is engaged in the sixth gear.

[0035] The above-mentioned techniques are well known to those skilled in the art. The above-described embodiments are only preferred embodiments of the present application and are not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A gearbox shift control system, characterized by, The gearbox shift execution mechanism includes a gearbox shift execution mechanism and a pneumatic shift combined control valve, the gearbox shift execution mechanism includes a shift fork shaft mounted on the right side in the housing, a shift fork mounted on the shift fork shaft, characterized in that a first cavity, a second cavity and a third cavity are arranged in the housing, a first piston is arranged between the first cavity and the second cavity, a second piston is arranged between the second cavity and the third cavity, the first piston and the second piston are coaxially arranged, the first piston is connected with the shift fork shaft, the second piston is mounted on the left side in the housing, B working port, F working port and M working port are formed on the housing, the B working port communicates with the first cavity, the F working port communicates with the second cavity, and the M working port communicates with the third cavity; the effective area of the first piston is smaller than that of the second piston; a second piston right end limiting step is arranged between the second cavity and the third cavity, when the second piston abuts against the second piston right end limiting step, the left end of the shift fork shaft abuts against the second piston; The pneumatic shift combined control valve includes a housing, a valve shaft, a first valve body, a second valve body and a third valve body, the valve shaft is mounted in the housing, the first valve body, the second valve body and the third valve body are mounted on the housing, a first cam, a second cam and a third cam are mounted on the valve shaft, the first cam drives the first valve body to act, the second cam drives the second valve body to act, and the third cam drives the third valve body to act; B1 working port, F1 working port and P1 inlet are formed on the first valve body; M2 working port and B2 working port are formed on the second valve body; M3 working port, L3 working port and R3 working port are formed on the third valve body; the B working port, the B1 working port and the B2 working port are communicated, the M working port, the M2 working port and the M3 working port are communicated, and the F working port and the F1 working port are communicated.

2. The gearbox shift control system of claim 1, wherein, The gearbox shift execution mechanism includes an execution valve, a shift fork gear is arranged on the shift fork, a rack is arranged on the execution valve, the shift fork gear is engaged with the rack, and the execution valve drives the shift fork to deflect; L working port and R working port are arranged on the execution valve, when the gas source enters the execution valve through the L working port, the shift fork is pushed downward to deflect into the low-speed gear area, and when the gas source enters the execution valve through the R working port, the shift fork is pushed upward to deflect into the high-speed gear area; the L working port is communicated with the L3 working port, and the R working port is communicated with the R3 working port.

3. The gearbox shift control system of claim 2, wherein, The pneumatic shift combined control valve includes a shift switch, a valve gear is mounted on the valve shaft, a shift gear is mounted on the shift switch, the shift gear is engaged with the valve gear, and a gear position indicator disc is mounted on the valve shaft.

4. The gearbox shift control system of claim 3, wherein, The pneumatic shift combined control valve includes a positioning wheel mounted on the valve shaft, a positioning adjusting bolt, a positioning spring and a positioning ball mounted on the housing, the positioning ball abuts against the positioning wheel, and the two ends of the positioning spring abut against the positioning ball and the positioning adjusting bolt respectively.

5. The gearbox shift control system of claim 4, wherein, The gearbox includes a first gear position, a second gear position, a third gear position, a fourth gear position, a fifth gear position and a sixth gear position; the first gear position is a low-speed gear position, the second gear position is a sub-low-speed gear position, the third gear position is a low-speed idle gear position, the fourth gear position is a fast idle gear position, the fifth gear position is a sub-fast gear position, and the sixth gear position is a fast gear position; the first gear position, the second gear position, the third gear position, the fourth gear position, the fifth gear position and the sixth gear position are arranged in sequence.

6. The gearbox shift control system of claim 5, wherein, when the shift switch is turned to the first gear, the P1 inlet communicates with the B1 working port; the air source enters the first cavity from the P1 inlet, the B1 working port, the B working port in turn to push the first piston to move left, the shift fork shaft moves left to push the second piston to the left end, the gear shift fork moves to the left end, and the gearbox is engaged in the first gear; when the shift switch is turned from the first gear to the second gear, the P1 inlet communicates with the F1 working port; the air source enters the second cavity from the P1 inlet, the F1 working port, the F working port in turn to push the first piston to move right, the shift fork shaft moves right to drive the gear shift fork to move to the right end, and the gearbox is engaged in the second gear; when the shift switch is turned from the second gear to the third gear, the P1 inlet communicates with the B1 working port, the M2 working port communicates with the B2 working port, and the M3 working port communicates with the L3 working port; part of the air source enters the execution valve from the P1 inlet, the B1 working port, the B2 working port, the M2 working port, the M3 working port, the L3 working port, and the L working port to push the gear shift fork to deflect downward into the low-speed gear area; part of the air source enters the third cavity from the P1 inlet, the B1 working port, the B2 working port, the M2 working port, the M3 working port, and the M working port in turn to push the second piston to move right; part of the air source enters the first cavity from the P1 inlet, the B1 working port, the B2 working port, and the B working port in turn to push the first piston to move left; since the effective area of the first piston is smaller than that of the second piston, the second piston abuts against the right end limiting step of the second piston, the left end of the shift fork shaft abuts against the second piston, the gear shift fork is in the intermediate position, and the gearbox is engaged in the third gear; when the shift switch is turned from the third gear to the fourth gear, the P1 inlet communicates with the B1 working port, the M2 working port communicates with the B2 working port, and the M3 working port communicates with the R3 working port; part of the air source enters the execution valve from the P1 inlet, the B1 working port, the B2 working port, the M2 working port, the M3 working port, the R3 working port, and the R working port to push the gear shift fork to deflect upward into the high-speed gear area; part of the air source enters the third cavity from the P1 inlet, the B1 working port, the B2 working port, the M2 working port, the M3 working port, and the M working port in turn to push the second piston to move right; part of the air source enters the first cavity from the P1 inlet, the B1 working port, the B2 working port, and the B working port in turn to push the first piston to move left; since the effective area of the first piston is smaller than that of the second piston, the second piston abuts against the right end limiting step of the second piston, the left end of the shift fork shaft abuts against the second piston, the gear shift fork is in the intermediate position, and the gearbox is engaged in the fourth gear; when the shift switch is turned from the fourth gear to the fifth gear, the P1 inlet communicates with the F1 working port; the air source enters the second cavity from the P1 inlet, the F1 working port, and the F working port in turn to push the first piston to move right, the shift fork shaft moves right to drive the gear shift fork to move to the right end, and the gearbox is engaged in the fifth gear. When the shift switch is shifted from the fifth gear to the sixth gear, the P1 inlet communicates with the B1 working port; the air source enters the first cavity from the P1 inlet, the B1 working port and the B working port in sequence to push the first piston to move left, the shift fork shaft moves left to push the second piston to the left end, the gear shift fork moves to the left end, and the gearbox is engaged in the sixth gear.

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