A shift system

Abstract

The present invention discloses a shifting system, which relates to the technical field of gear shifting. The system includes an oil tank, an oil pump, a relief valve, a two-position three-way solenoid valve, a three-position four-way solenoid valve, a clutch cylinder for actuating a clutch, and a gear cylinder for actuating a shift fork of a gearbox; the clutch cylinder further includes a first switch that cooperates with a piston of the clutch cylinder and is used to control a plurality of three-position four-way solenoid valves; the gear cylinder further includes a left switch and a right switch that cooperate with a piston of the gear cylinder and are used to control the two-position three-way solenoid valve. The beneficial effects of the present invention are as follows: during use, shifting can be achieved by simply toggling an electric switch integrated on the vehicle's center console to different gears, without the need to step on the clutch or perform the coordination of the accelerator and clutch. It is a novel shifting system that can replace the shifting mechanism of a manual transmission and can also be adopted by an AMT transmission.

Description

Technical Field

[0001] The present invention relates to the technical field of gear shifting, and more specifically to a shifting system. Background Art

[0002] Most domestic trucks or special vehicle transmissions use manual transmissions. When shifting gears, it is necessary to step on the clutch and manually shift gears. Since stepping on the clutch and manually shifting gears require skilled coordination, the operation cannot be completed without training. Moreover, the clutch is relatively heavy, and the foot will be extremely sore after frequent shifting. Summary of the Invention

[0003] A shifting system provided by the present invention aims to solve the above problems existing in the prior art.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A shifting system includes an oil tank, an oil pump, a relief valve, a two-position three-way solenoid valve, a three-position four-way solenoid valve, a clutch cylinder for actuating the clutch, and a gear cylinder for actuating the shift fork of the transmission. The outlet of the oil pump is connected to the P end of the two-position three-way solenoid valve, the P ends of several three-position four-way solenoid valves, and the p end of the relief valve; the A end of the two-position three-way solenoid valve is connected to the clutch cylinder, and the A end and B end of each three-position four-way solenoid valve are respectively connected to one of the above-mentioned gear cylinders; the inlet of the oil pump, the T end of the relief valve, the T end of the two-position three-way solenoid valve, and the Ts of several three-position four-way solenoid valves are all connected to the above-mentioned oil tank; it further includes a first switch that cooperates with the piston of the clutch cylinder, and this first switch is used to control several three-position four-way solenoid valves; it also includes a left switch and a right switch that cooperate with the piston of the gear cylinder, and both the left switch and the right switch are used to control the two-position three-way solenoid valve.

[0006] Further, it includes two of the above-mentioned three-position four-way solenoid valves and two of the above-mentioned gear cylinders.

[0007] Further, the first switch, the left switch, and the right switch are all microswitches.

[0008] Further, the clutch cylinder is provided with a first oil port and a second oil port, the piston of the clutch cylinder is provided with an oil passage, the A end of the two-position three-way solenoid valve is connected to the first oil port and is connected to the second oil port through a check valve, the piston of the clutch cylinder is further provided with an oil groove connecting the first oil port and the first oil passage, and the depth of this oil groove gradually decreases along the length direction of the clutch cylinder.

[0009] Furthermore, the cross-sectional profile of the oil groove is in a stepped shape.

[0010] Compared with the prior art, the advantages of the present invention are as follows:

[0011] First, the present invention mainly includes a fuel tank, an oil pump, a relief valve, a two-position three-way solenoid valve, a three-position four-way solenoid valve, a clutch cylinder for actuating a clutch, and a gear position cylinder for actuating a shift fork of a gearbox. When in use, shifting can be achieved by simply toggling an electric switch integrated on the vehicle's central console to different gear positions, without the need to step on the clutch or coordinate the use of the clutch and throttle. It is a new type of gear shifting system that can replace the shifting mechanism of a manual transmission and can also be adopted by an AMT transmission.

[0012] Second, in the present invention, the clutch cylinder is provided with a first oil port and a second oil port. The piston of the clutch cylinder is provided with an oil passage and an oil groove with a depth that gradually decreases along the length direction of the clutch cylinder. The A end of the two-position three-way solenoid valve, the first oil port, the oil groove, the oil passage, and the small chamber of the clutch cylinder are connected in sequence, and the small chamber of the clutch cylinder, the second oil port, the check valve, and the A end of the two-position three-way solenoid valve are connected in sequence. Due to the presence of the oil groove and oil passage in the piston of the clutch cylinder, in cooperation with the check valve, the flow direction and flow rate of the hydraulic oil can be controlled, so that the moving speed of the piston is not uniform. Especially when the piston moves leftward, from the fast speed at the starting stage of the stroke to the slow speed at the end stage of the stroke, it can well simulate the gear shifting operation process of a person, preventing the engine from stalling or the gearbox from experiencing speed jerks. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] The following describes the detailed implementation manners of the present invention with reference to the accompanying drawings. For a comprehensive understanding of the present invention, many details are described below, but for those skilled in the art, the present invention can be implemented without these details.

[0015] Referring to Figure 1 , a gear shifting system includes a fuel tank 1, an oil pump 3, a relief valve 4, a two-position three-way solenoid valve 6, a clutch cylinder 8, a three-position four-way solenoid valve 10, and a gear position cylinder 11. Among them, the inlet of the oil pump 3 is connected to the fuel tank 1, and an oil suction filter 2 is provided in the oil circuit between the oil pump 3 and the fuel tank 1. The outlet of the oil pump 3 is connected to the P end of a two-position three-way solenoid valve 6, the P ends of two three-position four-way solenoid valves 10, and the P end of a relief valve 4.

[0016] Referring to Figure 1 , the A end of the two-position three-way solenoid valve 6 is connected to the clutch cylinder 8, and the clutch cylinder 8 is used to actuate the clutch to switch the clutch state. The clutch cylinder 8 mainly consists of a check valve 7, a return spring, a cylinder block, a piston, and a first switch 9.

[0017] Referring to Figure 1, Specifically, a return spring for pushing the piston to the right is provided in the large chamber of the clutch cylinder 8, and a first oil port and a second oil port are provided in the small chamber. An oil passage 15 for communicating with the small chamber of the clutch cylinder is provided on the piston of the clutch cylinder, and an oil groove 14 for communicating the oil passage 15 and the first oil port is provided. More specifically, the depth of the oil groove 14 gradually decreases along the length direction of the clutch cylinder. Preferably, the cross-sectional profile of the oil groove 14 is stepped. The A end of the two-way three-way solenoid valve 6 is directly connected to the above-mentioned first oil port and is connected to the above-mentioned second oil port through a one-way valve 7. Preferably, the oil discharge port of the large chamber of the clutch cylinder 8 is connected to the fuel tank, so that the oil seeping from the small chamber of the clutch cylinder 8 into the large chamber can flow back to the fuel tank 1. Preferably, an oil return filter 5 is provided between the fuel tank, the overflow valve and the clutch cylinder 8.

[0018] Refer to Figure 1 , The A end and the B end of the three-way four-way solenoid valve 10 are connected to the gear position cylinder 11, and the gear position cylinder is used to actuate the shift fork of the gearbox to switch gears. The gear position cylinder 11 mainly consists of a large chamber spring, a piston, a cylinder block, a small chamber spring, a left switch 12 and a right switch 13. Specifically, the A end of the three-way four-way solenoid valve 10 is connected to the large chamber oil port of the gear position cylinder 11, and the B end is connected to the small chamber oil port of the gear position cylinder 11. Of course, the number of the three-way four-way solenoid valves 10 and the gear position cylinders 11 is not limited to two, and the number should be determined according to the number of shift forks of the gearbox (a common five-speed gearbox usually has two shift forks).

[0019] Refer to Figure 1 , The first switch 9 cooperates with the piston of the clutch cylinder 8 to control the two three-way four-way solenoid valves 10; the left switch 12 and the right switch 13 cooperate with the piston of the gear position cylinder 11 to control the two-way three-way solenoid valve 6. Preferably, the first switch 9, the left switch 12 and the right switch 13 all adopt microswitches.

[0020] The working principle of the present invention:

[0021] Refer to Figure 1 , After the oil pump 3 operates, the oil passes through the oil suction filter 2 to the oil pump 3. If the gear is in the neutral position (the driver turns the multi-gear electric switch on the vehicle console to the neutral gear), both the two-way three-way solenoid valve 6 and the two three-way four-way solenoid valves 10 are de-energized. At this time, most of the oil flows from the oil pump 3 through the overflow valve 4 and then through the oil return filter 5 back to the fuel tank 1, and a small part of the oil flows from the oil pump 3 through the two-way three-way solenoid valve 6 and the above-mentioned first oil port into the small chamber of the clutch cylinder 8, causing the piston of the clutch cylinder 8 to move to the left, thereby locking the clutch and the engine flywheel. At the same time, since both of the two three-way four-way solenoid valves 10 are de-energized, the pistons of the two gear position cylinders 11 are both at the midpoint of the stroke, putting the gearbox in the neutral gear.

[0022] Refer to Figure 1When there is a gear shift operation (i.e. the driver turns the multi-speed electric switch on the vehicle center console to a non-neutral gear position), the two-position three-way solenoid valve 6 is energized. At this time, the valve core of the two-position three-way solenoid valve 6 moves rightward, and the oil in the small chamber of the clutch oil cylinder 8 flows back to the oil tank through the first oil port and the second oil port, the one-way valve 7 and the T end of the two-position three-way solenoid valve 6 under the action of the return spring, and the piston of the clutch oil cylinder 8 moves rightward quickly, and the clutch friction plate is separated and unlocked from the engine flywheel. At the same time, the piston of the clutch oil cylinder 8 touches the first switch 9 while moving rightward. The contacts of the first switch 9 are closed, so that the coil S1 or S2 of at least one three-position four-way solenoid valve related to the shifting operation is energized, the valve core of the three-position four-way solenoid valve moves left or right, and the oil from the oil pump 3 enters the small chamber or large chamber of the corresponding gear cylinder 11 through the three-position four-way solenoid valve 10, pushing the piston of the gear cylinder 11 to move left or right, thereby shifting at least one shift fork in the gearbox, so that the gearbox is in the gear corresponding to the above-mentioned shifting operation. At the same time, when the piston of the gear cylinder 11 moves to the left or right and reaches its position, it touches the left switch 12 or the right switch 13. The contacts of the left switch 12 or the right switch 13 are closed, causing the two-position three-way solenoid valve 6 to lose power. The valve core of the two-position three-way solenoid valve 6 moves to the left, and the oil enters the small chamber of the clutch cylinder 8 from the above-mentioned first oil port. Since the one-way valve 7 is closed in the reverse direction, the above-mentioned second oil port is blocked at this time, causing the piston of the clutch cylinder 8 to move to the left. Since the oil groove 14 on the piston opens from large to small, as the piston moves to the left, the oil flow also changes from large to small, and the speed of the piston moving to the left will change from fast to slow, causing the clutch friction plate to engage from fast to slow. In this way, the human gear shifting operation process can be well simulated, so that the engine will not stall or the gearbox will not stall, and the clutch and the engine flywheel are completely locked.

[0023] It can be seen that (1) due to the action of the springs at both ends of the gear cylinder, three-point positioning can be achieved, namely, the starting point of the cylinder stroke, the midpoint of the cylinder stroke (the combined action of the springs at both ends), and the end point of the cylinder stroke. (2) Since the piston of the clutch cylinder has an oil groove 14, the one-way valve can control the flow direction and flow rate of the hydraulic oil, so that the speed of the piston retraction action is not uniform, and different speeds can be achieved for different strokes, from fast at the beginning of the stroke to slow at the end of the stroke. In this way, the human gear shifting operation process can be well simulated, so that the engine will not stall or the gearbox will not stall, and the clutch and the engine flywheel will be completely locked.

[0024] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A gear shifting system, Features: It includes an oil tank, an oil pump, an overflow valve, a two-position three-way solenoid valve, a three-position four-way solenoid valve, a clutch oil cylinder for actuating a clutch, and a gear oil cylinder for actuating a gear shift fork of a gearbox, wherein the outlet of the oil pump is connected to the P end of the two-position three-way solenoid valve, the P ends of several three-position four-way solenoid valves, and the p end of the overflow valve; the A end of the two-position three-way solenoid valve is connected to the clutch oil cylinder, and the A end and the B end of each three-position four-way solenoid valve are correspondingly connected to one of the gear oil cylinders; the inlet of the oil pump, the T end of the overflow valve, the T end of the two-position three-way solenoid valve, and the T ends of several three-position four-way solenoid valves are all connected to the oil tank; the clutch oil cylinder also includes a The piston of the clutch cylinder cooperates with a first switch, which is used to control a plurality of three-position four-way solenoid valves; the gear cylinder also includes a left switch and a right switch that cooperate with the piston of the gear cylinder, and the left switch and the right switch are used to control a two-position three-way solenoid valve; the clutch cylinder is provided with a first oil port and a second oil port, the piston of the clutch cylinder is provided with an oil channel, the A end of the two-position three-way solenoid valve is connected to the first oil port and is connected to the second oil port through a one-way valve, the piston of the clutch cylinder is also provided with an oil groove connecting the first oil port and the first oil channel, and the depth of the oil groove decreases from large to small along the length direction of the clutch cylinder, and the cross-sectional profile of the oil groove is stepped. When there is a gear shift operation, the two-position three-way solenoid valve is energized, and its valve core moves to the right. Under the action of the return spring, the oil in the small chamber of the clutch cylinder flows back to the oil tank through the first oil port and the second oil port, the one-way valve and the T end of the two-position three-way solenoid valve. The piston of the clutch cylinder quickly moves to the right, and the clutch friction plate is separated and unlocked from the engine flywheel; at the same time, the piston of the clutch cylinder hits the first switch during the right movement, and the contacts of the first switch are closed, so that the coil of the three-position four-way solenoid valve is energized, and the valve core of the three-position four-way solenoid valve moves left or right. The oil from the oil pump enters the small chamber or large chamber of the corresponding gear cylinder through the three-position four-way solenoid valve, pushing the piston of the gear cylinder to move left or right. , thereby moving at least one shift fork in the gearbox, so that the gearbox is in the gear position corresponding to the above-mentioned shift operation; at the same time, when the piston of the gear cylinder moves left or right, it touches the left switch or the right switch, and the contacts of the left switch or the right switch are closed, so that the two-position three-way solenoid valve loses power, and its valve core moves left, and oil enters the small chamber of the clutch cylinder from the above-mentioned first oil port. Since the one-way valve is reversely closed, the above-mentioned second oil port is blocked at this time, causing the piston of the clutch cylinder to move left. As the piston moves left, the oil flow rate also changes from large to small, and the speed of the piston moving left will change from fast to slow, so that the clutch friction plate also changes from fast to slow when it is engaged, until the clutch and the engine flywheel are completely locked.

2. A gear shifting system according to claim 1, Features: It includes two three-position four-way solenoid valves and two gear oil cylinders.

3. A gear shifting system according to claim 1, Features: The first switch, the left switch and the right switch are all micro switches.

Images