Mechanical automatic transmission main and auxiliary gearbox shared gear shift control mechanism and control method

Abstract

The application provides a main and auxiliary gearbox shared gear shifting control mechanism and control method of a mechanical automatic transmission. The main transmission comprises a plurality of gear shifting shafts, each of which is fixed with a gear shifting block. The gear shifting blocks are arranged side by side, and the neutral slots of the gear shifting blocks are arranged in alignment when in neutral. The gear shifting blocks are matched with selected gear shifting heads, the selected gear shifting heads are matched with selected gear shifting actuators, the corresponding gear shifting blocks can be accurately selected according to the movement position measurement, the corresponding gear shifting shafts are driven to move by the gear shifting actuators, and the target gear position is engaged. The mechanism further comprises a rocker shaft, the rocker shaft is installed with a high and low gear shifting transition rocker, one end of the high and low gear shifting transition rocker is matched with a high and low gear shifting shaft through a main arm head, and the other end of the high and low gear shifting transition rocker is provided with a low gear position arc-shaped head and a high gear position arc-shaped head for matching with the selected gear shifting head. The high and low gear shifting of the auxiliary transmission can be completed by using the selected gear shifting actuators of the main transmission.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of variable speed transmission, and particularly relates to a main and auxiliary gearbox shared gear shifting control mechanism of a mechanical automatic transmission and a control method. BACKGROUND

[0002] An AMT (Automatic Mechanical Transmission) is a kind of transmission which is based on a gear type mechanical transmission, and is equipped with a control system and a gear shifting execution mechanism to replace a driver to complete gear selection and gear shifting of the transmission, and finally realizes automation of the gear shifting process. Since the gear type transmission structure is maintained, the transmission efficiency is high, the economy is good, the mechanism is compact, and the operation is reliable, and the advantages are well inherited. Compared with a hydraulic automatic transmission, the AMT has the advantages of low cost, good production inheritance, and easy installation, and therefore, has more development advantages in meeting the power transmission requirements of commercial vehicles.

[0003] In order to meet the power requirements, a part of commercial vehicles are usually provided with an auxiliary transmission (realizing high and low gear switching) on the basis of a main transmission to increase the transmission range. At this time, the AMT control system also needs to have an auxiliary transmission to increase a set of gear shifting execution mechanism to implement high and low gear switching. Therefore, the overall cost of the AMT system is increased, and problems such as difficult arrangement of the execution mechanism are encountered in the specific design process. SUMMARY

[0004] The present application aims at overcoming the deficiencies of the prior art, and provides a main and auxiliary gearbox shared gear shifting control mechanism of a mechanical automatic transmission and a control method, which can use the gear selection execution mechanism of the main transmission to complete the high and low gear switching of the auxiliary transmission, so that the transmission structure is compact and the system cost is reduced.

[0005] In order to realize the above technical features, the present application is realized as follows: a main and auxiliary gearbox shared gear shifting control mechanism of a mechanical automatic transmission, which comprises a main transmission, the main transmission comprises a plurality of gear shifting shafts, each gear shifting shaft is fixed with a gear shifting block, the gear shifting blocks are arranged side by side, and when in neutral, the neutral grooves of the gear shifting blocks are arranged in alignment.

[0006] The gear shifting blocks are matched with gear selection and shifting knobs, the gear selection and shifting knobs are matched with gear selection execution mechanisms, and can measure and accurately select the corresponding gear shifting blocks according to the movement position, and under the driving of the gear shifting execution mechanisms, the corresponding gear shifting shafts are pushed to move and engage the target gear position.

[0007] Further comprising a rocker shaft, the rocker shaft is installed with a high and low gear shifting transition rocker, one end of the high and low gear shifting transition rocker is matched with a high and low gear shifting shaft through a main arm knob, and the other end of the high and low gear shifting transition rocker is provided with a low gear position arc-shaped knob and a high gear position arc-shaped knob for matching with the gear selection and shifting knobs.

[0008] The high-low gear combination sleeve or synchronizer is mounted on the high-low gear shift shaft.

[0009] The main transmission adopts a six-gear main transmission and its high-low gear sub-transmission; specifically including a first-second gear shift shaft, a third-fourth gear shift shaft, and a fifth-sixth gear shift shaft.

[0010] A control method of a mechanical automatic transmission main sub-gearbox shared gear shift operating mechanism:

[0011] By utilizing the feature that the main transmission and the sub-transmission high-low gears are not shifted at the same time, and the sub-transmission high-low gear switching must be completed in a static state, by sharing the main transmission gear selection actuator, and by rationally designing the high-low gear shift transition rocker arm size and its swing angle, the switching of the sub-transmission high-low gears is realized.

[0012] When the main transmission is in the neutral gear, the gear selection shift knob can accurately select the corresponding shift block according to the movement position measurement under the control of the gear selection actuator, and can push the corresponding shift shaft to move to engage the target gear under the drive of the shift actuator.

[0013] In operation, when the main transmission gear is switched, it will first return to the neutral gear state, at which time the neutral gear slots of the shift blocks are aligned, the gear selection shift knob moves up and down among the first-second gear shift shaft, the third-fourth gear shift shaft, and the fifth-sixth gear shift shaft to select the target gear shift shaft, and then moves left and right to shift gears under the drive of the shift actuator, thereby completing the switching of the target gear.

[0014] When the sub-transmission needs to select the low gear, the gear selection shift knob is first controlled by the shift mechanism to return the main transmission to the neutral gear, so that the neutral gear slots of the shift blocks are aligned, the gear selection actuator drives the gear selection shift knob to move downward until it passes the first-second gear shift shaft and contacts the low gear arc-shaped shift head of the high-low gear shift transition rocker arm, and continues to move downward to make the high-low gear shift transition rocker arm rotate clockwise around the rocker arm shaft, thereby controlling the high-low gear shift shaft to move to the left, i.e., the low gear direction, until it is engaged in the low gear. After completing the low gear switching, the gear selection shift knob is moved upward to the main transmission target gear shift fork shaft to restore the main transmission target gear.

[0015] When the sub-transmission needs to select the high gear, the gear selection shift knob is first controlled by the shift mechanism to return the main transmission from the current gear to the neutral gear, and then the gear selection actuator drives the gear selection shift knob to move upward until it passes the fifth-sixth gear shift shaft and contacts the high gear arc-shaped shift head of the high-low gear shift transition rocker arm, and then the high-low gear shift transition rocker arm rotates counterclockwise around the rocker arm shaft to control the high-low gear shift shaft to move to the right, i.e., the high gear direction, until it is engaged in the high gear. After completing the high gear switching, the gear selection shift fork is moved downward to the main transmission target gear shift fork shaft to restore the main transmission target gear.

[0016] By rationally designing the swing angle of the high and low gear shift transition rocker arm and the displacement of the high and low gear shift shaft, and with accurate position detection of the gear selection actuator, it is ensured that the gear selector can smoothly switch between high and low gears without interfering with the shift shaft of the main transmission.

[0017] The present invention has the following beneficial effects:

[0018] This invention fully utilizes the fact that the main and auxiliary transmissions do not shift gears simultaneously at different times, especially in vehicles where the auxiliary transmission's gear shifting must be completed statically. By sharing the main transmission's gear selection actuator and rationally designing the dimensions and swing angle of the high / low gear shift transition rocker arm, the auxiliary transmission's gear shifting is achieved. This solution significantly reduces system costs while simplifying the mechanism layout. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Fig. 1 This is a state diagram of the integrated gear shifting control mechanism for the main and auxiliary transmissions of the present invention when the auxiliary transmission needs to select a lower gear.

[0021] Fig. 2 This is a state diagram of the integrated gear shifting control mechanism for the main and auxiliary transmissions of the present invention when the auxiliary transmission needs to select a higher gear.

[0022] In the diagram: 1. High / low gear shift shaft; 2. High / low gear combination sleeve or synchronizer; 3. High / low gear shift transition rocker arm; 4. Rocker arm shaft; 5. Shift selector; 6. First / second gear shift shaft; 7. Third / fourth gear shift shaft; 8. Fifth / sixth gear shift shaft; 9. High gear arc-shaped shifter; 10. Low gear arc-shaped shifter; 11. Main arm shifter. Detailed Implementation

[0023] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0024] Example 1:

[0025] Please see Figs. 1-2A shared shift control mechanism for the main and auxiliary gearboxes of a mechanical automatic transmission includes a main transmission with multiple shift shafts. Each shift shaft is equipped with a shift paddle, which is arranged side-by-side. In neutral, the neutral slots of the shift paddles are aligned. The shift paddles cooperate with a shift selector 5, which cooperates with a shift selector mechanism and can measure and accurately select the corresponding shift paddle based on its position. Under the drive of the shift selector mechanism, the shift shaft is moved to engage the target gear. The transmission also includes a rocker arm shaft 4 with a high / low gear shift transition rocker arm 3 mounted on it. One end of the high / low gear shift transition rocker arm 3 cooperates with the high / low gear shift shaft 1 via a main arm paddle 11, and the other end of the high / low gear shift transition rocker arm 3 is provided with a low-gear arc-shaped paddle 10 and a high-gear arc-shaped paddle 9 for cooperating with the shift selector 5. By adopting the aforementioned high and low gear shifting control mechanism, the high and low gear switching of the auxiliary transmission can be completed using the main transmission gear selection actuator, making the transmission structure compact and helping to reduce system costs.

[0026] Furthermore, a high / low gear engagement sleeve or synchronizer 2 is installed on the high / low gear shift shaft 1.

[0027] Furthermore, the main transmission adopts a six-speed main transmission and its high and low gear auxiliary transmissions; specifically, it includes a first and second gear shift shaft 6, a third and fourth gear shift shaft 7, and a fifth and sixth gear shift shaft 8.

[0028] Example 2:

[0029] A control method for a shared shift control mechanism for the main and auxiliary gearboxes of a mechanical automatic transmission:

[0030] By utilizing the characteristics that the high and low gears of the main transmission and the auxiliary transmission do not shift simultaneously, and that the shifting of the auxiliary transmission's high and low gears must be completed under static conditions, and by sharing the gear selection actuator of the main transmission, the size and swing angle of the high and low gear shifting transition rocker arm 3 are rationally designed to achieve the switching of the auxiliary transmission's high and low gears.

[0031] Example 3:

[0032] To describe the technical features of the invention, a six-speed main transmission and its high-low gear auxiliary transmission are used as an example. In actual operation, the switching between the six gears of the main transmission and the switching between high and low gears of the auxiliary transmission do not occur simultaneously, making the implementation of this solution possible. The specific description is as follows:

[0033] When the main transmission is in neutral, the shift paddle 5, under the control of the shift actuator, can accurately select the corresponding shift paddle based on the measured position and, driven by the shift actuator, push the corresponding shift shaft to move and engage the target gear.

[0034] During operation, when the main transmission shifts gears, it first returns to neutral. At this time, the neutral slots of each shift lever are aligned. The shift lever 5 moves up and down between the first and second gear shift shafts 6, the third and fourth gear shift shafts 7, and the fifth and sixth gear shift shafts 8. After selecting the target gear shift shaft, it moves left and right under the drive of the shift actuator to complete the shifting of the target gear.

[0035] When the auxiliary transmission needs to select a lower gear, the shift mechanism controls the shift selector 5 to first return the main transmission to neutral, aligning the neutral slots of each shift paddle. The shift mechanism then moves the shift selector 5 downwards until it passes the first and second gear shift shafts 6 and contacts the low gear arc-shaped shifter 10 of the high-low gear shift transition rocker arm 3. It continues to move downwards, causing the high-low gear shift transition rocker arm 3 to rotate clockwise around the rocker arm shaft 4. This controls the high-low gear shift shaft 1 to move to the left, i.e., towards the low gear, until a low gear is engaged. After the low gear shift is completed, the shift selector 5 moves upwards to the target gear shift fork shaft of the main transmission, restoring the main transmission to the target gear.

[0036] When the auxiliary transmission needs to select a higher gear, the shift mechanism controls the shift fork 5 to first return the main transmission from the current gear to neutral. Then, the shift mechanism drives the shift fork 5 to move upward until it passes the fifth and sixth gear shift shaft 8 and contacts the high-gear arc-shaped shift fork 9 of the high-low gear shift transition rocker arm 3. The high-low gear shift transition rocker arm 3 rotates counterclockwise around the rocker arm shaft 4, controlling the high-low gear shift shaft 1 to move to the right, i.e., the high gear direction, until the high gear is engaged. After the high gear shift is completed, the shift fork moves down to the target gear shift fork shaft of the main transmission, restoring the target gear of the main transmission.

[0037] By rationally designing the swing angle of the high and low gear shift transition rocker arm 3 and the displacement of the high and low gear shift shaft 1, and with accurate position detection of the gear selection actuator, it is ensured that the shift dial 5 can smoothly switch between high and low gears without interfering with the shift shaft of the main transmission.

Claims

1. A control method for a shared shift control mechanism for the main and auxiliary gearboxes of a mechanical automatic transmission, wherein the shared shift control mechanism includes a main transmission, the main transmission includes multiple shift shafts, each shift shaft is fixed with a shift paddle, the shift paddles are arranged side by side, and in neutral, the neutral slots of the shift paddles are aligned. The shift block is engaged with the shift selector (5), the shift selector (5) is engaged with the shift selector mechanism and can accurately select the corresponding shift block according to the movement position. Under the drive of the shift selector mechanism, the shift shaft is pushed to move and the target gear is engaged. It also includes a rocker arm shaft (4), on which a high-low gear shift transition rocker arm (3) is installed. One end of the high-low gear shift transition rocker arm (3) is connected to the high-low gear shift shaft (1) via the main arm shifter (11). The other end of the high-low gear shift transition rocker arm (3) is provided with a low gear arc-shaped shifter (10) and a high gear arc-shaped shifter (9) for cooperating with the shifter (5). Its features are, The control method: By taking advantage of the fact that the high and low gears of the main transmission and the auxiliary transmission do not shift at the same time, and that the shifting of the high and low gears of the auxiliary transmission must be completed under static conditions; by sharing the gear selection actuator of the main transmission, the size and swing angle of the high and low gear shifting transition rocker arm (3) are reasonably designed to realize the switching of the high and low gears of the auxiliary transmission; When the auxiliary transmission needs to select a low gear, the shift mechanism controls the shift selector (5) to first return the main transmission to neutral, aligning the neutral slots of each shift paddle. The shift mechanism then drives the shift selector (5) to move downward until it passes the first and second gear shift shaft (6) and contacts the low gear arc-shaped shifter (10) of the high and low gear shift transition rocker arm (3). It continues to move downward, causing the high and low gear shift transition rocker arm (3) to rotate clockwise around the rocker arm shaft (4), thereby controlling the high and low gear shift shaft (1) to move to the left, i.e., the low gear direction, until a low gear is engaged. After the low gear shift is completed, the shift selector (5) moves upward to the target gear shift fork shaft of the main transmission, restoring the target gear of the main transmission.

2. The control method for a shared shifting control mechanism for the main and auxiliary gearboxes of a mechanical automatic transmission according to claim 1, characterized in that: The high and low gear shift shaft (1) is equipped with a high and low gear coupling sleeve or synchronizer (2).

3. The control method for a shared shifting control mechanism for the main and auxiliary gearboxes of a mechanical automatic transmission according to claim 1, characterized in that: The main transmission adopts a six-speed main transmission and its high and low gear auxiliary transmissions; specifically, it includes a first and second gear shift shaft (6), a third and fourth gear shift shaft (7), and a fifth and sixth gear shift shaft (8).

4. The control method for a shared shifting control mechanism for the main and auxiliary gearboxes of a mechanical automatic transmission according to claim 1, characterized in that: When the main transmission is in neutral, the shift paddle (5) under the control of the shift actuator can accurately select the corresponding shift paddle based on the movement position measurement, and drive the corresponding shift shaft to move under the drive of the shift actuator, and engage the target gear.

5. The control method for a shared shifting control mechanism for the main and auxiliary gearboxes of a mechanical automatic transmission according to claim 3, characterized in that: During operation, when the main transmission shifts gears, it will first return to the neutral state. At this time, the neutral slots of each shift paddle are aligned. The shift paddle (5) moves up and down between the first and second gear shift shafts (6), the third and fourth gear shift shafts (7), and the fifth and sixth gear shift shafts (8). After selecting the target gear shift shaft, it moves left and right under the drive of the shift actuator to complete the target gear shift.

6. The control method for a shared shifting control mechanism for the main and auxiliary gearboxes of a mechanical automatic transmission according to claim 3, characterized in that: When the auxiliary transmission needs to select a higher gear, the shift mechanism controls the shift fork (5) to first return the main transmission from the current gear to neutral. Then, the shift mechanism drives the shift fork (5) to move upward until it passes the fifth and sixth gear shift shaft (8) and contacts the high gear arc-shaped shift fork (9) of the high and low gear shift transition rocker arm (3). The high and low gear shift transition rocker arm (3) rotates counterclockwise around the rocker arm shaft (4) to control the high and low gear shift shaft (1) to move to the right, i.e., the high gear direction, until the high gear is engaged. After the high gear shift is completed, the shift fork moves down to the target gear shift fork shaft of the main transmission and restores the target gear of the main transmission.

7. The control method for a shared shift control mechanism for the main and auxiliary gearboxes of a mechanical automatic transmission according to claim 1, characterized in that: By rationally designing the swing angle of the high and low gear shift transition rocker arm (3) and the displacement of the high and low gear shift shaft (1), and with accurate position detection of the gear selection actuator, it is ensured that the shift dial (5) can smoothly switch between high and low gears without interfering with the shift shaft of the main transmission.

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