A gearbox shift actuator

Abstract

This invention discloses a gearbox shifting actuator. A shift fork shaft is mounted on the right side of a housing, and a shift fork is mounted on the shift fork shaft. The housing contains a first cavity, a second cavity, and a third cavity. A first piston is positioned between the first and second cavities, and a second piston is positioned between the second and third cavities. The first and second pistons are coaxially arranged and connected to the shift fork shaft. The second piston is mounted on the left side of the housing. The housing has air ports B, F, and M. Air port B communicates with the first cavity, air port F communicates with the second cavity, and air port M communicates with the third cavity. This invention uses an air source to achieve automatic gearbox shifting, improving the shifting response and accuracy of the automatic gearbox. It has an ingenious structure and strong practicality.

Description

Technical Field

[0001] This invention relates to the field of machinery, and in particular to a gearbox shifting actuator. 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 shifting actuator that uses an air source to realize automatic gear shifting, thereby improving the shifting response and accuracy of the automatic gearbox. It has an ingenious structure and strong practicality.

[0006] On one hand, the present invention provides a gearbox shifting actuator, wherein a shift fork shaft is installed on the right side of the housing, and a shift fork is installed on the shift fork shaft. The housing is characterized by having a first cavity, a second cavity, and a third cavity; a first piston is disposed between the first cavity and the second cavity; a second piston is disposed between the second cavity and the third cavity; the first piston and the second piston are coaxially arranged; the first piston is connected to the shift fork shaft; the second piston is installed on the left side of the housing; and the housing has a B-port, an F-port, and an M-port, with the B-port communicating with the first cavity, the F-port communicating with the second cavity, and the M-port communicating with the third cavity.

[0007] Furthermore, the effective working area of ​​the first piston is smaller than that of the second piston.

[0008] Furthermore, a right-end limiting step for the second piston is provided between the second cavity and the third cavity. When the second piston abuts against the limiting step, the left end of the shift fork shaft abuts against the second piston.

[0009] Furthermore, the device includes an actuator valve, a shift fork gear on the shift fork, and a rack on the actuator valve. The shift fork gear meshes with the rack, and the actuator valve drives the shift fork to deflect. The actuator valve is equipped with an L port and an R port. When air enters the actuator valve through the L port, it pushes the shift fork downward to enter the low-speed range. When air enters the actuator valve through the R port, it pushes the shift fork upward to enter the high-speed range.

[0010] Furthermore, including the first gear, when the air source enters the actuator valve through the L port and pushes the gear shift fork downward to enter the low speed range, at the same time the air source enters the first chamber through the B port and pushes the first piston to the left. The shift fork shaft moves to the left and pushes 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.

[0011] Furthermore, including the second gear, when the air source enters the actuator valve through the L port and pushes the gear shift fork downward to enter the low-speed gear zone, at the same time the air source enters the second chamber through the F port and pushes the first piston to move to the right. The shift fork shaft moves to the right and drives the gear shift fork to move to the right end, and the gearbox engages the second gear.

[0012] Furthermore, including the third gear, when the air source enters the actuator valve through the L port and pushes the gear shift fork downward to enter the low-speed range, at the same time, the air source enters the third chamber through the M port and pushes the second piston to the right, and the air source enters the first chamber through the B port and pushes the first piston to the left. Since the effective working area of ​​the first piston is smaller than that of the second piston, the second piston abuts against the limit step, and the left end of the shift fork shaft abuts against the second piston. The gear shift fork is in the middle position, and the gearbox is engaged in the third gear.

[0013] Furthermore, including the fourth gear, when the air source enters the actuator valve through the R port and pushes the shift fork upward to enter the fast gear zone, at the same time, the air source enters the third chamber through the M port and pushes the second piston to the right, and the air source enters the first chamber through the B port and pushes the first piston to the left. Since the effective working area of ​​the first piston is smaller than that of the second piston, the second piston abuts against the limit step, and the left end of the shift fork shaft abuts against the second piston. The shift fork is in the middle position, and the gearbox is engaged in the fourth gear.

[0014] Furthermore, including the fifth gear, when the air source enters the actuator valve through the R port and pushes the gear shift fork to deflect upward and enter the fast gear zone, at the same time the air source enters the second chamber through the F port and pushes the first piston to move to the right. The shift fork shaft moves to the right and drives the gear shift fork to move to the right end, and the transmission engages the fifth gear.

[0015] Furthermore, including the sixth gear, when the air source enters the actuator valve through the R port and pushes the shift fork upward to enter the fast gear zone, at the same time the air source enters the first chamber through the B port and pushes the first piston to the left. The shift fork shaft moves to the left and pushes the second piston to the left end. The shift fork moves to the left end, and the gearbox engages the sixth gear.

[0016] The advantages of the gearbox shifting actuator of the present invention compared with the prior art are as follows:

[0017] 1. Due to the fast response speed of compressed air, the automatic shifting of the gearbox is achieved by using an air source, which improves the shifting response and accuracy of the automatic gearbox. The structure is ingenious and highly practical.

[0018] 2. The gearbox shifting actuator of the present invention has six gears, can automatically select and shift gears, has a clever structure, and is highly practical. Attached Figure Description

[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0020] Figure 1 This is a schematic diagram of the gearbox shifting actuator of the present invention. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] like Figure 1 As shown, this invention provides a gearbox shifting actuator. A shift fork shaft 11 is installed on the right side of a housing 10, and a shift fork 12 is installed on the shift fork shaft 11. A first cavity 14, a second cavity 15, and a third cavity 16 are provided within the housing 10. A first piston 18 is disposed between the first cavity 14 and the second cavity 15, and a second piston 17 is disposed between the second cavity 15 and the third cavity 16. The first piston 18 and the second piston 17 are coaxially arranged. The first piston 18 is connected to the shift fork shaft 11, and the second piston 17 is installed on the left side of the housing 10. A B-port, an F-port, and an M-port are provided on the housing 10. The B-port communicates with the first cavity 14, the F-port communicates with the second cavity 15, and the M-port communicates with the third cavity 16. The effective working area of ​​the first piston 18 is smaller than that of the second piston 17. Therefore, under the same air pressure, the thrust of the first piston 18 is less than the thrust of the second piston 17. A right-end limiting step 19 of the second piston 17 is provided between the second cavity 15 and the third cavity 16. When the second piston 17 abuts against the limiting step 19, the left end of the shift fork shaft 11 abuts against the second piston 17.

[0023] The system includes an actuator valve 13, a shift fork gear 120 on a shift fork 12, and a rack 130 on the actuator valve 13. The shift fork gear 120 meshes with the rack 130, and the actuator valve 13 drives the shift fork 12 to deflect. The actuator valve 13 is provided with an L port and an R port. When the air source enters the actuator valve 13 through the L port, it pushes the shift fork 12 to deflect downward to enter the low-speed range. When the air source enters the actuator valve 13 through the R port, it pushes the shift fork 12 to deflect upward to enter the high-speed range.

[0024] Including the first gear, i.e. the low gear, when the air source enters the actuator valve 13 through the L port and pushes the gear shift fork 12 to deflect downward into the low gear area, at the same time the air source enters the first chamber 14 through the B port and pushes the first piston 18 to the left. The shift fork shaft 11 moves to the left and pushes 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.

[0025] Including the second gear, i.e. the second lowest speed gear, when the air source enters the actuator valve 13 through the L port and pushes the gear shift fork 12 to deflect downwards into the low speed gear area, at the same time the air source enters the second chamber 15 through the F port and pushes the first piston 18 to the right. The shift fork shaft 11 moves to the right and drives the gear shift fork 12 to move to the right end, and the gearbox is engaged in the second gear.

[0026] Including the third gear, i.e., the low-speed neutral, when the air source enters the actuator valve 13 through the L port and pushes the gear shift fork 12 downward to enter the low-speed gear zone, at the same time, the air source enters the third chamber 16 through the M port and pushes the second piston 17 to the right, and the air source enters the first chamber 14 through the B port and pushes the first piston 18 to the left. Since the effective working area of ​​the first piston 18 is smaller than the effective working area of ​​the second piston 17, the second piston 17 abuts against the limit step 19, the left end of the shift fork shaft 11 abuts against the second piston 17, the gear shift fork 12 is in the middle position, and the gearbox is engaged in the third gear.

[0027] Including the fourth gear, i.e. the fast zone neutral, when the air source enters the actuator valve 13 through the R air port and pushes the gear shift fork 12 to deflect upward and enter the fast gear zone, at the same time, the air source enters the third chamber 16 through the M air port and pushes the second piston 17 to the right, and the air source enters the first chamber 14 through the B air port and pushes the first piston 18 to the left. Since the effective working area of ​​the first piston 18 is smaller than the effective working area of ​​the second piston 17, the second piston 17 abuts against the limit step 19, the left end of the shift fork shaft 11 abuts against the second piston 17, the gear shift fork 12 is in the middle position, and the gearbox is engaged in the fourth gear.

[0028] Including the fifth gear, i.e. the second fastest gear, when the air source enters the actuator valve 13 through the R air port and pushes the gear shift fork 12 to deflect upward and enter the fast gear zone, at the same time the air source enters the second chamber 15 through the F air port and pushes the first piston 18 to the right. The shift fork shaft 11 moves to the right and drives the gear shift fork 12 to move to the right end, and the gearbox is engaged in the fifth gear.

[0029] Including the sixth gear, i.e. the fast gear, when the air source enters the actuator valve 13 through the R air port and pushes the gear shift fork 12 to deflect upward and enter the fast gear zone, at the same time the air source enters the first chamber 14 through the B air port and pushes the first piston 18 to the left. The shift fork shaft 11 moves to the left and pushes 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.

[0030] The techniques not described above are common knowledge to those skilled in the art. The above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gearbox shift actuator, a shift fork shaft is installed in the right side in the housing, a shift fork is installed on the shift fork shaft, characterized in that, The first cavity, the second cavity and the third cavity are arranged in the shell, the first piston is arranged between the first cavity and the second cavity, the 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 fork shaft, the second piston is installed on the left side in the shell, the B gas port, the F gas port and the M gas port are arranged on the shell, the B gas port is communicated with the first cavity, the F gas port is communicated with the second cavity, and the M gas port is communicated with the third cavity; the effective acting area of the first piston is smaller than the effective acting area of the second piston; the second piston right end limiting step is arranged between the second cavity and the third cavity, when the second piston abuts against the limiting step, the left end of the fork shaft abuts against the second piston; The execution valve is arranged on the gear lever, the rack is arranged on the execution valve, the gear lever is engaged with the rack, and the execution valve drives the gear lever to deflect; the L gas port and the R gas port are arranged on the execution valve, when the gas source enters the execution valve from the L gas port and pushes the gear lever to deflect downward to enter the low-speed gear area, when the gas source enters the execution valve from the R gas port and pushes the gear lever to deflect upward to enter the high-speed gear area. When the gas source enters the execution valve from the L gas port and pushes the gear lever to deflect downward to enter the low-speed gear area, the gas source enters the first cavity from the B gas port and pushes the first piston to move left, the second piston is pushed to the left end by the left movement of the fork shaft, and the gear lever moves to the left end, so that the gearbox is engaged in the first gear.

2. The gearbox shift actuator of claim 1, wherein, When the gas source enters the execution valve from the L gas port and pushes the gear lever to deflect downward to enter the low-speed gear area, the gas source enters the second cavity from the F gas port and pushes the first piston to move right, the gear lever is driven to move to the right end by the right movement of the fork shaft, and the gearbox is engaged in the second gear.

3. The transmission shift actuator of claim 1, wherein, When the gas source enters the execution valve from the L gas port and pushes the gear lever to deflect downward to enter the low-speed gear area, the gas source enters the third cavity from the M gas port and pushes the second piston to move right, the gas source enters the first cavity from the B gas port and pushes the first piston to move left, because the effective acting area of the first piston is smaller than the effective acting area of the second piston, the second piston abuts against the limiting step, the left end of the fork shaft abuts against the second piston, the gear lever is in the intermediate position, and the gearbox is engaged in the third gear.

4. The transmission shift actuator of claim 1, wherein, When the gas source enters the execution valve from the R gas port and pushes the gear lever to deflect upward to enter the high-speed gear area, the gas source enters the third cavity from the M gas port and pushes the second piston to move right, the gas source enters the first cavity from the B gas port and pushes the first piston to move left, because the effective acting area of the first piston is smaller than the effective acting area of the second piston, the second piston abuts against the limiting step, the left end of the fork shaft abuts against the second piston, the gear lever is in the intermediate position, and the gearbox is engaged in the fourth gear.

5. The transmission shift actuator of claim 1, wherein, When the gas source enters the execution valve from the R gas port and pushes the gear lever to deflect upward to enter the high-speed gear area, the gas source enters the second cavity from the F gas port and pushes the first piston to move right, the gear lever is driven to move to the right end by the right movement of the fork shaft, and the gearbox is engaged in the fifth gear.

6. The transmission shift actuator of claim 1, wherein, The sixth gear is included, when the air source from the R port enters the execution valve to push the gear shift fork to deflect upward to enter the fast gear area, and the air source from the B port enters the first cavity 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 into the sixth gear.

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