A precise shift fork for a gearbox

Abstract

The present invention relates to the technical field of gearboxes, and in particular to a gearbox precision shift fork mechanism, comprising a fork shaft, a fork for connecting a synchronizer is arranged on the fork shaft, a magnetic ring is also arranged on the fork shaft, and the magnetic ring is detachably connected to the fork shaft, and further comprising a driving member and a sensor, wherein the driving member is used to drive the fork shaft to move, and the sensor is arranged corresponding to the magnetic ring and is used to sense the position of the magnetic ring, and when the sensor senses the position of the magnetic ring, it sends a signal toward the driving member for stopping the driving member from working. The driving member pushes the fork shaft to move, and the fork on the fork shaft is connected to the synchronizer, so that the fork shaft can drive the synchronizer to move when it moves, and when the magnetic ring moves to the corresponding position, the magnetic ring is received by the sensor, and the sensor sends a signal to stop the driving member from working, and the driving member stops further driving the fork shaft, thereby reducing the situation where the fork further forms interference and deformation and affects the operation of the speed change line.

Description

Technical Field

[0001] The invention relates to the technical field of gearboxes, and in particular to a gearbox precision shift fork. Background Art

[0002] The transmission, also known as the gearbox, is a mechanism used to change the speed and torque from the engine, change the transmission ratio, expand the range of change of the torque and speed of the drive wheel, so as to adapt to the frequently changing driving conditions, and at the same time make the engine work under the condition of higher power and lower fuel consumption. By using the neutral gear, the power transmission is interrupted so that the engine can start and change speed, and the transmission is convenient for shifting gears or power output, and the car can go backwards without changing the direction of engine rotation.

[0003] The existing gearbox usually has a shift fork for shifting. The working principle of the gearbox shift fork is mainly to achieve shifting by transmitting operating force, controlling gear switching and fixing the locking ring. When the driver operates the shift lever, the operating force is first transmitted to the shift fork through the shift fork arm. The shape and position of the shift fork arm determine the size and direction of the transmitted force. The end of the shift fork arm is connected to the locking ring of the gear. The gear switching is controlled by the movement of the shift fork arm. However, if the shift fork shaft moves excessively during the shifting process, the shift fork is prone to deformation and damage, which in turn affects the operation of the gearbox. Summary of the invention

[0004] In order to solve the problem in the prior art that if the shift fork shaft moves excessively during the shifting process, the shift fork is prone to deformation and damage, which in turn affects the operation of the gearbox, the present application provides a gearbox precise shift fork, and the specific solution is as follows.

[0005] A gearbox precision shift fork comprises a fork shaft, on which a fork for connecting a synchronizer is arranged, on which a magnetic ring is also arranged, and the magnetic ring is detachably connected to the fork shaft, and further comprises a driving member and a sensor, wherein the driving member is used to drive the fork shaft to move, the sensor is arranged corresponding to the magnetic ring and is used to sense the position of the magnetic ring, and when the sensor senses the position of the magnetic ring, it sends a signal toward the driving member for stopping the driving member from working.

[0006] By adopting the above technical solution, the driving member pushes the shift fork shaft to move, and the shift fork on the shift fork shaft is connected to the synchronizer. Therefore, the shift fork shaft can drive the synchronizer to move when it moves. When the magnetic ring moves to the corresponding position, the magnetic ring is received by the sensor, and the sensor sends a signal to stop the driving member from working. The driving member stops further driving the shift fork shaft, thereby reducing the situation where the shift fork further interferes and deforms, thereby affecting the operation of the speed change line.

[0007] Optionally, corresponding mounting holes are provided on the magnetic ring and the fork shaft, and the mounting holes are provided for threaded connection of bolts.

[0008] By adopting the above technical solution, the magnetic ring and the fork shaft are detachably connected. When the magnetism of the magnetic ring weakens, the magnetic ring can be removed and replaced in time, thereby reducing the situation where the magnetic ring cannot send a signal to the sensor after losing its magnetism. When the sensor cannot detect the magnetic ring, the magnetic ring can be replaced in time.

[0009] Optionally, limit pads are provided on both sides of the magnetic ring, and the limit pads are detachably connected to the fork shaft and are used to abut the magnetic ring.

[0010] By adopting the above technical solution, limit pads are arranged on both sides of the magnetic ring. After the magnetic ring falls off, the limit pads can abut against the magnetic ring, thereby limiting the displacement of the magnetic ring and reducing the situation where the magnetic ring moves on the fork shaft and affects the operation of the gearbox.

[0011] Optionally, the shift fork includes a connecting rod and two fork arms, the fork arms are respectively arranged on both sides of the connecting rod, the connecting rod is detachably connected to the fork shaft, the fork arms are used to embed a synchronizer, a plurality of limiting steel balls are arranged on the fork arms, the limiting steel balls are arranged at equal intervals along the fork arms, a spring is arranged between the limiting steel balls and the fork arms, and the spring has a tendency to push the limiting steel balls away from the fork arms.

[0012] By adopting the above technical solution, a fork arm is set to be connected with the synchronizer, and a limiting steel ball is set. Since a plurality of limiting steel balls are set to push the synchronizer, the synchronizer can be clamped from all directions, so that the fork arm can clamp the synchronizer, thereby reducing the situation where the shift fork falls off when driving the synchronizer to move, thereby improving the stability of the gearbox operation.

[0013] Optionally, the fork arm is further provided with buffer blocks at both ends in the width direction, and the buffer blocks have a tendency to push the synchronizer groove wall.

[0014] By adopting the above technical solution, buffer blocks are arranged at both ends of the fork arm in the width direction. The buffer blocks have a tendency to push the synchronizer groove wall. The buffer blocks can push the synchronizer groove wall so that the fork arm of the shift fork can be more stably fixed on the synchronizer groove wall, thereby reducing the fork arm from coming out. The buffer blocks can also provide buffering for the fork arm when the shift fork moves excessively, thereby reducing the deformation of the fork arm during movement, and further improving the stability of the gearbox operation.

[0015] Optionally, the buffer block is slidably connected to the fork arm, and an elastic member for pushing the buffer block is provided in the fork arm, and the elastic member has a tendency to push the elastic member to move toward the synchronizer groove wall.

[0016] By adopting the above technical solution, a buffer block and an elastic member are arranged on the fork arm, and the elastic member and the buffer block play a buffering role on the fork arm, which is simple to implement, and the buffer block can slide and move after being subjected to force, thereby reducing the friction between the buffer block and the synchronizer and the wear caused by the large friction.

[0017] Optionally, an oil storage chamber is provided inside the fork arm, and the oil storage chamber is used to store lubricating oil. The fork arm is provided with an oil filling port and an oil outlet. The oil filling port is provided with a screw cap, which is detachably connected to the fork arm and is used to cover the oil filling port, and the oil outlet is used to discharge the lubricating oil toward the groove wall of the synchronizer.

[0018] By adopting the above technical solution, an oil storage chamber is opened inside the fork arm and lubricating oil is regularly discharged from the fork arm toward the groove wall of the synchronizer. Due to the abutment between the buffer block and the synchronizer, the synchronizer is prone to generate greater friction with the buffer block when rotating, thereby affecting the rotation of the synchronizer. Therefore, an oil storage chamber is provided on the fork arm to lubricate the groove wall of the synchronizer and the buffer block, thereby reducing the problem of synchronizer jamming and improving the stability of the gearbox. The shift fork itself is prone to friction with the synchronizer and cause wear and damage. Therefore, an oil storage chamber is provided to inject and discharge lubricating oil, which can improve the service life of the shift fork and synchronizer to a certain extent.

[0019] Optionally, an oil outlet channel is opened in the buffer block, one end of the oil outlet channel is used to be connected to the oil outlet, and the other end of the oil outlet channel is arranged toward the groove wall of the synchronizer. When the buffer block moves toward the inside of the fork arm, the oil outlet channel is connected with the oil storage chamber. When the buffer block moves away from the fork arm, the buffer block blocks the oil storage chamber.

[0020] By adopting the above technical scheme, an oil outlet channel is opened in the buffer block, and when the buffer block moves toward the inside of the fork arm, the oil outlet channel is connected with the oil storage chamber, and when the buffer block moves away from the fork arm, the buffer block blocks the oil storage chamber. Therefore, when the shift fork pushes the synchronizer to move, the buffer block will connect the oil outlet channel with the oil storage chamber, so that the oil can flow out for lubrication, reducing the situation where the oil continues to flow out and waste, and the oil can flow out from the buffer block, which is a part where the fork arm and the synchronizer are in close contact, so the lubricating oil flowing out from this part can directly lubricate the part with greater friction, thereby further improving the working stability of the synchronizer.

[0021] Optionally, a sealing gasket is further provided on the buffer block, and the sealing gasket is fixedly connected to the buffer block. When the buffer block moves away from the fork arm, the sealing gasket blocks the oil storage cavity.

[0022] By adopting the above technical solution, a sealing gasket is also provided on the buffer block. When the buffer block cuts off the oil storage cavity from the outside, the sealing gasket can further improve the sealing effect of the oil in the oil storage cavity and reduce the waste of oil leaking out.

[0023] In summary, this application has at least the following beneficial effects:

[0024] 1. The present application solves the problem in the prior art that if the shift fork shaft moves excessively during the gear shifting process, the shift fork is easily deformed and damaged, thereby affecting the operation of the gearbox. The present application detects the displacement of the shift fork shaft by setting a magnetic ring and a sensor. When the shift fork shaft moves to a specified position, the sensor sends a signal to stop the driving member, thereby reducing the deformation of the shift fork caused by interference between the shift fork and the synchronizer due to excessive movement of the shift fork shaft, thereby improving the stability of the gearbox operation.

[0025] 2. The present application also provides a buffer block, which plays a buffering role when the shift fork drives the synchronizer, further reducing the deformation of the shift fork, and is provided with an oil storage chamber for replenishing oil. The buffer block controls the flow of lubricating oil, and the lubricating oil is discharged at the buffer block, thereby reducing the excessive friction between the buffer block and the synchronizer and affecting the operation of the synchronizer. At the same time, the friction between the shift fork and the synchronizer is reduced, and the service life of the shift fork and the synchronizer is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a front view of the first embodiment.

[0027] Figure 2 It is a three-dimensional diagram of the first embodiment.

[0028] Figure 3 It is a cross-sectional view of the second embodiment.

[0029] Description of reference numerals:

[0030] 1. Fork shaft; 11. Magnetic ring; 111. Mounting hole; 112. Limit pad;

[0031] 2. Fork; 21. Connecting rod;

[0032] 3. Sensor;

[0033] 4. fork arm; 41. limiting steel ball; 42. spring; 43. buffer block; 431. oil outlet channel; 432. sealing gasket; 44. elastic member; 45. oil storage chamber; 451. oil filling port; 452. oil outlet; 453. screw cap. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-3 , the present application is further described in detail through specific embodiments.

[0035] Embodiment 1

[0036] A gearbox precision shift fork, such as Figure 1 and Figure 2 As shown, it includes a fork shaft 1, and a fork 2 for connecting a synchronizer is arranged on the fork 2. A magnetic ring 11 is also arranged on the fork shaft 1, and the magnetic ring 11 is detachably connected to the fork shaft 1. It also includes a driving member and a sensor 3. The driving member is used to drive the fork shaft 1 to move, and the sensor 3 is arranged corresponding to the magnetic ring 11 and is used to sense the position of the magnetic ring 11. The sensor 3 senses the position of the magnetic ring 11 and sends a signal toward the driving member. In specific implementation, the driving member includes a cylinder, an oil cylinder, etc., which are arranged in the gearbox, and the sensor 3 includes a magnetoresistive sensor 3 and an anisotropic magnetoresistive sensor 3. Both sensors 3 can sense the magnetic field and send signals, thereby realizing the control of the driving member. The sensor 3 also needs to be arranged at a corresponding position in the gearbox, thereby realizing the position control of the fork shaft 1. In other embodiments, the driving member can also be replaced by a mechanical structure, that is, the fork shaft 1 is controlled by the speed change method of a manual transmission car.

[0037] like Figure 1 and Figure 2 As shown, corresponding mounting holes 111 are provided on the magnetic ring 11 and the fork shaft 1, and the mounting holes 111 are provided for bolt threaded connection. Limiting pads 112 are provided on both sides of the magnetic ring 11, and the limiting pads 112 are fixedly connected to the fork shaft 1 and are used to abut the magnetic ring 11. In specific implementation, the magnetic ring 11 can be removed and replaced, thereby reducing the situation where the magnetic ring 11 fails and the sensor 3 cannot detect it.

[0038] like Figure 1 and Figure 2 As shown, the shift fork 2 includes a connecting rod 21 and two fork arms 4, the fork arms 4 are respectively arranged on both sides of the connecting rod 21, and the fork arms 4 on both sides are fixedly connected to the connecting rod 21. The connecting rod 21 is detachably connected to the shift fork shaft 1, and the fork arms 4 are used to embed the synchronizer. A plurality of limiting steel balls 41 are arranged on the fork arm 4, and the limiting steel balls 41 are arranged at equal intervals along the fork arm 4. A spring 42 is arranged between the limiting steel balls 41 and the fork arm 4, and the spring 42 has a tendency to push the limiting steel balls 41 away from the fork arm 4. In specific implementation, a plurality of limiting steel balls 41 push the synchronizer at the same time, thereby clamping the synchronizer, reducing the situation where the fork arm 4 falls off from the synchronizer, making the connection between the shift fork 2 and the synchronizer more stable, and improving the stability of the gearbox when working.

[0039] Working principle: After the fork shaft 1 moves to the specified position and corresponds to the magnetic ring 11, the sensor 3 sends a signal to stop the driving part and stop the further movement of the fork shaft 1, thereby reducing the excessive movement of the fork shaft 1, which causes the fork 2 to interfere with the synchronizer and cause deformation, thereby improving the stability of the gearbox operation.

[0040] Embodiment 2

[0041] like Figure 3 As shown, the main difference between the second embodiment and the first embodiment is that the fork arm 4 is also provided with buffer blocks 43 at both ends in the width direction, and the buffer blocks 43 have a tendency to push the synchronizer groove wall. The buffer block 43 is slidably connected to the fork arm 4, and an elastic member 44 for pushing the buffer block 43 is provided in the fork arm 4, and the elastic member 44 has a tendency to push the elastic member 44 toward the synchronizer groove wall. In specific implementation, the elastic member 44 includes a spring 42, one end of the spring 42 is fixedly connected to the buffer block 43, and the other end of the spring 42 is fixedly connected to the fork arm 4, and the spring 42 pushes the buffer block 43 to move, so that the buffer block 43 presses against the synchronizer.

[0042] like Figure 3 As shown, an oil storage chamber 45 is provided inside the fork arm 4, and the oil storage chamber 45 is used to store lubricating oil. An oil filling port 451 and an oil outlet 452 are provided on the fork arm 4. A screw cap 453 is provided at the oil filling port 451, and the screw cap 453 is threadedly connected to the oil filling port 451, thereby realizing a detachable connection and being used to cover the oil filling port 451. In specific implementation, after the screw cap 453 is opened, the oil is injected from the oil filling port 451. After the oil is injected, the screw cap 453 needs to be re-installed, and then the oil can flow out of the lubricating oil from the oil outlet 452 toward the groove wall of the synchronizer, thereby reducing the friction between the synchronizer and the fork arm 4, thereby increasing the service life of the fork arm 4.

[0043] like Figure 3 As shown, an oil outlet channel 431 is provided in the buffer block 43, one end of the oil outlet channel 431 is used to connect with the oil outlet port 452, and the other end of the oil outlet channel 431 is arranged toward the groove wall of the synchronizer. When the buffer block 43 moves toward the inside of the fork arm 4, the oil outlet channel 431 is connected with the oil storage chamber 45, and when the buffer block 43 moves away from the fork arm 4, the buffer block 43 blocks the oil storage chamber 45. In specific implementation, when the buffer block 43 is pressed against the synchronizer and pushed toward the elastic member 44, the oil outlet channel 431 is connected with the oil storage chamber 45, and the oil in the oil storage chamber 45 can be discharged from the oil outlet channel 431, thereby reducing the situation where the oil continuously leaks when the shift fork 2 is not matched with the synchronizer.

[0044] like Figure 3 As shown, a sealing gasket 432 is also fixed on the buffer block 43, and the sealing gasket 432 is fixedly connected to the buffer block 43. When the buffer block 43 moves away from the fork arm 4, the sealing gasket 432 blocks the oil storage chamber 45. In a specific implementation, the sealing gasket 432 includes a rubber pad. When the fork arm 4 is not matched with the synchronizer, the buffer block 43 can move away from the fork arm 4, and then the sealing gasket 432 can block the oil storage chamber 45, thereby reducing oil leakage.

[0045] Working principle: The deformation of the shift fork 2 is reduced by setting a buffer block 43, and an oil storage chamber 45 is set to store oil. The flow of the oil is then controlled by the buffer block 43, thereby reducing the deformation of the shift fork 2 and reducing the friction between the shift fork 2 and the synchronizer, further improving the life of the shift fork 2.

[0046] The above are preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A gearbox precision shift fork, comprising a fork shaft (1), on which a fork (2) for connecting to a synchronizer is arranged, characterized in that: The shift fork shaft (1) is also provided with a magnetic ring (11), the magnetic ring (11) is detachably connected to the shift fork shaft (1), and further comprises a driving member and a sensor (3), the driving member is used to drive the shift fork shaft (1) to move, the sensor (3) is provided corresponding to the magnetic ring (11) and is used to sense the position of the magnetic ring (11), and when the sensor (3) senses the position of the magnetic ring (11), it sends a signal toward the driving member for stopping the driving member from working; The shift fork (2) comprises a connecting rod (21) and two fork arms (4), wherein the fork arms (4) are respectively arranged on both sides of the connecting rod (21), the connecting rod (21) is detachably connected to the shift fork shaft (1), the fork arms (4) are used to embed a synchronizer, a plurality of limiting steel balls (41) are arranged on the fork arms (4), the limiting steel balls (41) are arranged at equal intervals along the fork arms (4), a spring (42) is arranged between the limiting steel balls (41) and the fork arms (4), and the spring (42) has a tendency to push the limiting steel balls (41) away from the fork arms (4); The fork arm (4) is also provided with buffer blocks (43) at both ends in the width direction, and the buffer blocks (43) have a tendency to push the synchronizer groove wall; The buffer block (43) is slidably connected to the fork arm (4), and an elastic member (44) for pushing the buffer block (43) is arranged in the fork arm (4), and the elastic member (44) has a tendency to push the buffer block (43) to move toward the synchronizer groove wall; An oil storage chamber (45) is provided inside the fork arm (4), and the oil storage chamber (45) is used to store lubricating oil. An oil filling port (451) and an oil outlet (452) are provided on the fork arm (4). A rotary cover (453) is provided at the oil filling port (451), and the rotary cover (453) is detachably connected to the fork arm (4) and is used to cover the oil filling port (451). The oil outlet (452) is used to discharge the lubricating oil toward the groove wall of the synchronizer. An oil outlet channel (431) is provided in the buffer block (43), one end of the oil outlet channel (431) is used to be connected to the oil outlet port (452), and the other end of the oil outlet channel (431) is arranged toward the groove wall of the synchronizer. When the buffer block (43) moves toward the inside of the fork arm (4), the oil outlet channel (431) is communicated with the oil storage chamber (45), and when the buffer block (43) moves away from the fork arm (4), the buffer block (43) blocks the oil storage chamber (45); The buffer block (43) is also provided with a sealing gasket (432), and the sealing gasket (432) is fixedly connected to the buffer block (43). When the buffer block (43) moves away from the fork arm (4), the sealing gasket (432) blocks the oil storage cavity (45).

2. A transmission precision shift fork according to claim 1, characterized in that: The magnetic ring (11) and the shift fork shaft (1) are provided with corresponding mounting holes (111), and the mounting holes (111) are provided for bolt threaded connection.

3. The transmission precision shift fork according to claim 1, characterized in that: Limiting pads (112) are arranged on both sides of the magnetic ring (11); the limiting pads (112) are detachably connected to the fork shaft (1) and are used to abut against the magnetic ring (11).

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