CN115614468B - AMT gear shifting cylinder and transmission - Google Patents

AMT gear shifting cylinder and transmission Download PDF

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Publication number
CN115614468B
CN115614468B CN202211157905.0A CN202211157905A CN115614468B CN 115614468 B CN115614468 B CN 115614468B CN 202211157905 A CN202211157905 A CN 202211157905A CN 115614468 B CN115614468 B CN 115614468B
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China
Prior art keywords
piston
air
air hole
cylinder
mounting groove
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CN202211157905.0A
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Chinese (zh)
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CN115614468A (en
Inventor
刘晓雷
刘卓
张海涛
殷崇一
章刚
刘义
严鉴铂
聂幸福
张建刚
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Shaanxi Fast Gear Co Ltd
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Shaanxi Fast Gear Co Ltd
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Priority to CN202211157905.0A priority Critical patent/CN115614468B/en
Publication of CN115614468A publication Critical patent/CN115614468A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/26—Generation or transmission of movements for final actuating mechanisms
    • F16H61/28—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
    • F16H61/30—Hydraulic or pneumatic motors or related fluid control means therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30—Constructional features of the final output mechanisms
    • F16H63/32—Gear shift yokes, e.g. shift forks

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Gear-Shifting Mechanisms (AREA)

Abstract

The invention relates to the technical field of gear shifting control of a transmission, in particular to an AMT gear shifting cylinder and the transmission, which are communicated with a fourth air hole and a fifth air hole of a piston assembly respectively through a first air hole, a second air hole and a third air hole on a cylinder body in a matched manner, and can quickly supplement air for the reverse side of the movement of a piston at the last section of the gear shifting process through the matching of a low-gear buffer air supplementing device and a high-gear buffer air supplementing device in mounting grooves at the two ends of the piston assembly, so that pressure difference is formed at the two sides of the piston, the force and the speed of striking a shell when a shifting fork is shifted into position are reduced, the noise is reduced, and the experience of a user is greatly improved. The problem of rely on back auxiliary box shift fork head to strike the casing and come spacing among the prior art, bring the striking sound big, user experience feels poor is solved.

Description

AMT gear shifting cylinder and transmission
Technical Field
The invention relates to the technical field of gear shifting control of a transmission, in particular to an AMT gear shifting cylinder and the transmission.
Background
The gear box shifting cylinder is mainly used in an automobile gear box, and the range gear shifting fork shaft is driven to move by a piston under the action of air pressure so as to realize the back and forth switching of a low gear and a high gear. The shifting of a typical AMT transmission actuator (GSU) is typically not limited by the cylinder piston of its own GSU, as the strength of the cylinder limited end cap cannot meet the shift life requirements.
Therefore, a gear shifting sliding sleeve in the transmission is generally adopted for limiting, but because the gear shifting force required by gear shifting of the rear auxiliary box synchronizer is large, gear shifting impact is large, if the problem of early collapse failure of the synchronizer limiting teeth can be caused by the limiting of the sliding sleeve of the rear auxiliary box synchronizer, and the requirement of the gear shifting service life cannot be met.
The gear shifting fork head inside the transmission is used for limiting, and the problem that the synchronizer limiting teeth generated by limiting the gear shifting sliding sleeve break down and fail in early stage and meet the requirement of gear shifting service life can be solved. But rely on the back auxiliary box shift fork head to strike the casing and come spacing, can bring the impact sound again and big, user experience feels poor problem.
Disclosure of Invention
Aiming at the problems of large impact sound and poor user experience caused by the fact that the shifting fork head of the rear auxiliary box impacts the shell to limit in the prior art, the invention provides the AMT gear shifting cylinder and the transmission, which can effectively reduce the impact sound and improve the user experience.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
The AMT gear shifting cylinder comprises a cylinder body and a cylinder end cover, wherein a first air hole, a second air hole and a third air hole are sequentially formed in the cylinder body, and the cylinder body is connected with the cylinder end cover in a matched manner and is used for sealing the inner space of the cylinder body; the cylinder body is internally connected with a piston assembly in a sliding manner, and the piston assembly is connected with a piston fork shaft; the piston fork shaft penetrates through the cylinder end cover to be connected with a shifting fork shaft, and a front shell, a shifting fork and a rear shell are sequentially arranged on the shifting fork shaft; a first mounting groove is formed in one end of the piston assembly, and a low-gear buffer air supplementing device is arranged in the first mounting groove and used for providing reverse buffer for the piston assembly during downshifting; the other end of the piston assembly is provided with a second mounting groove, and a high-gear buffer air supplementing device is arranged in the second mounting groove and used for providing reverse buffer for the piston assembly during upshifting; a fourth air hole and a fifth air hole are formed in the piston assembly, the fourth air hole is communicated with the first mounting groove, and the fifth air hole is communicated with the second mounting groove; the fourth air hole or the fifth air hole is communicated with the second air hole when moving along with the piston assembly to correspond to the second air hole.
Preferably, the low-gear buffer air supplementing device comprises a first piston, and the first piston is in sliding fit with the inner wall of the first mounting groove; the first piston is provided with a first air cavity along the axial direction, and the first air cavity is communicated with the cylinder end cover; a plurality of first air inlets are formed in one end, far away from the cylinder end cover, of the first piston in the radial direction, and the first air inlets are communicated with the first air cavity and the first mounting groove.
Preferably, a first baffle is arranged at one end, close to the cylinder end cover, of the first mounting groove, and a first reset spring is arranged between the first baffle and the first piston and used for resetting the first piston.
Preferably, a first limiting device is arranged in a first mounting groove between the first baffle and the cylinder end cover and used for limiting the first baffle.
Preferably, the high-gear buffer air supplementing device comprises a second piston, and the second piston is in sliding fit with the inner wall of the second mounting groove; the second piston is provided with a second air cavity along the axial direction, and the second air cavity is communicated with one end of the cylinder body, which is far away from the end cover of the cylinder; and one end, close to the end cover of the cylinder, of the second piston is provided with a plurality of second air inlets in the radial direction, and the second air inlets are communicated with the second air cavity and the second mounting groove.
Preferably, a second baffle is arranged at one end, close to the inner wall of the cylinder body, of the second mounting groove, and a second reset spring is arranged between the second baffle and the second piston and used for resetting the second piston.
Preferably, a second limiting device is arranged in a second mounting groove between the second baffle and the inner wall of the cylinder body and used for limiting the second baffle.
Preferably, a sealing ring is arranged on the piston assembly between the fourth air hole and the fifth air hole and used for blocking air flow between the fourth air hole and the fifth air hole.
Preferably, sealing rings are arranged between the first piston and the inner wall of the first mounting groove, between the second piston and the inner wall of the second mounting groove, between the piston assembly and the inner wall of the cylinder body and between the piston fork shaft and the cylinder end cover.
A transmission comprises the AMT gear shifting cylinder.
Compared with the prior art, the invention has the following beneficial effects:
The invention provides an AMT gear shifting cylinder, which is characterized in that a first air hole, a second air hole and a third air hole are formed in a cylinder body, a low-gear buffer air supplementing device and a high-gear buffer air supplementing device are arranged on a piston assembly in the cylinder body, and the low-gear buffer air supplementing device and the high-gear buffer air supplementing device are arranged on the piston assembly in the cylinder body through the cooperation of the first air hole, the second air hole and the third air hole, so that reverse buffer air supplementing is provided for the piston assembly in the gear shifting process, the reduction of the movement speed of the piston assembly and the reduction of acting force are realized, the buffer is provided for the gear shifting process, the impact force and the speed are reduced, the noise generated by the impact of a shifting fork and a front shell and a rear shell is further reduced, and the aim of improving the gear shifting experience of a user is fulfilled. Meanwhile, the effective buffering can also slow down the impact force of the shifting fork and the front and rear shells, reduce the possibility of part failure caused by impact, improve the service life of the parts and reduce the maintenance cost of the machine.
Further, through the cooperation setting to first piston, first air cavity, fourth air vent and first inlet port on the first piston in the low gear buffering air supplementing device, realize the cooperation of second air vent and low gear buffering air supplementing device to realize that the piston subassembly both ends form pressure differential in the downshift in-process, and then reduce the shift fork and to the impact dynamics of back casing, reach the purpose of noise reduction.
Further, through the cooperation setting to the second piston in the high-speed buffer air supplementing device, second air cavity, fifth air vent and the second inlet port on the second piston, realize the cooperation of second air vent and high-speed buffer air supplementing device to realize that the piston subassembly both ends form pressure differential in the upshift in-process, and then reduce the impact dynamics of shift fork to the preceding casing, reach the purpose of noise reduction.
Further, the first reset spring and the second reset spring are arranged, so that the first piston and the second piston can be reset automatically respectively, the first piston and the second piston are clung to the end parts of the first mounting groove and the second mounting groove respectively, the first piston is prevented from being opened when the piston assembly moves leftwards to engage with the high gear, and the second piston is prevented from being opened when the piston assembly moves rightwards to engage with the low gear; and the gear shifting buffer function requirement is ensured.
Further, the arrangement of the sealing ring can ensure that the air pressure in the whole cavity is kept stable, promote each component to keep running stably, achieve the dustproof effect, keep the cleaning of the moving cavity and further prolong the service life of the mechanical component.
The invention also provides a transmission comprising the AMT gear shifting cylinder, the transmission can realize the reverse buffering and air supplementing when gear is just entered in the gear shifting process, namely when the sliding sleeve combining teeth just enter the engagement, and pressure difference is formed before and after the piston assembly, so that the acting force of the piston assembly is greatly reduced, and finally, the force and the speed of the shifting fork impacting the shell are greatly reduced, thereby reducing the impacting noise in the gear shifting process and having better user experience.
Drawings
Fig. 1 is a schematic cross-sectional structure of an AMT shift cylinder according to the invention.
Fig. 2 is a cross-sectional view of the piston assembly of the present invention.
FIG. 3 is a cross-sectional view of the low-gear buffer air supply device of the invention.
FIG. 4 is a cross-sectional view of a high-speed buffer air make-up device of the present invention.
Fig. 5 is a schematic diagram of the low gear position of the AMT shift cylinder of the present invention.
FIG. 6 is a schematic diagram of AMT shift cylinder status during upshifts according to the present invention.
Fig. 7 is a schematic diagram of the high gear position of the AMT shift cylinder of the present invention.
FIG. 8 is a schematic diagram of AMT shift cylinder status during downshift according to the present invention.
The device comprises a 1-cylinder body, a 2-piston assembly, a 3-piston fork shaft, a 4-cylinder end cover, a 5-front shell, a 6-shifting fork, a 7-elastic pin, an 8-shifting fork, a 9-rear shell, an X-high gear buffer air supplementing device, a Y-low gear buffer air supplementing device, an H-first air hole, an M second air hole, an L-third air hole, an A-fourth air hole, a B-fifth air hole, a 21-first piston, a 22-first return spring, a 23-first air inlet hole, a 24-first baffle plate, a 25-second piston, a 26-second air inlet hole, a 27-second baffle plate, a 28-second return spring, a 29-second limiting device and a 30-first limiting device.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present invention, it should be noted that, if the terms "upper," "lower," "horizontal," "inner," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the term "horizontal" if present does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The invention will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the invention.
The invention discloses an AMT gear shifting cylinder, referring to FIGS. 1 to 2, comprising a cylinder body 1 and a cylinder end cover 4 which is matched and connected with the cylinder body; preferably, a sealing ring is arranged between the cylinder end cover 4 and the cylinder body 1 and is used for sealing the cylinder body 1, and the cylinder end cover 4 is connected with the cylinder body 1 through a spigot centering bolt; the cylinder body 1 is provided with a first air hole H, a second air hole M and a third air hole L, preferably, the first air hole H, the second air hole M and the third air hole L are all arranged along the radial direction of the cylinder body 1, and the second air hole M is positioned between the third air hole L and the first air hole H; preferably, the aperture and the intake air pressure of the first air hole H and the third air hole L are the same; the aperture of the second air hole M is 2-2.5 times of the aperture of the first air hole H or the third air hole L; the air inlet pressure of the second air hole M is set to be 65-75% of the air inlet pressure of the first air hole H or the third air hole L; the inside of the cylinder body 1 is slidably connected with a piston assembly 2, and a sealing ring is arranged between the piston assembly 2 and the inner wall of the cylinder body 1 and used for ensuring the air pressure inside the cylinder body 1; the piston assembly 2 is provided with a fourth air hole A and a fifth air hole B, and the aperture of the fourth air hole A and the aperture of the fifth air hole B are equal to the aperture of the second air hole M; the piston assembly 2 between the fourth air hole A and the fifth air hole B is provided with a sealing ring for blocking air flow between the fourth air hole A and the fifth air hole B; the end part of the piston assembly 2 is connected with a piston fork shaft 3, the piston fork shaft 3 penetrates through the cylinder end cover 4 to be connected with a shifting fork shaft 8, and a sealing ring is arranged between the piston fork shaft 3 and the cylinder end cover 4; the shifting fork shaft 8 sequentially penetrates through the front shell 5 and the shifting fork 6 to be propped against the inside of the rear shell 9; preferably, the shifting fork 6 is connected with the shifting fork shaft 8 through an elastic pin 7, the piston fork shaft 3 is connected with the shifting fork shaft 8 through a shoulder and a groove in a matched manner, and the axial freedom degree of the shifting fork shaft 8 is restrained; one end of the piston assembly 2 is provided with a first mounting groove, and the other end of the piston assembly is provided with a second mounting groove; preferably, the ends of the first mounting groove and the second mounting groove are conical structures, the cross-sectional area of one end of the first mounting groove far away from the cylinder end cover 4 is smaller than the cross-sectional area of the other end close to the cylinder end cover 4, and the end face area of one end of the second mounting groove far away from the bottom end of the cylinder block 1 is smaller than the end face area of the other end close to the bottom end of the cylinder block 1.
Referring to fig. 3, the first mounting groove is provided with a low-gear buffer air supplementing device Y, which is used for providing reverse buffer for the piston assembly 2 during the down shift, and includes a first piston 21, the first piston 21 is slidably matched with the inner wall of the first mounting groove, and a sealing ring is arranged between the first piston 21 and the inner wall of the first mounting groove; preferably, the end of the first piston 21 is a conical surface body structure matched with the end of the first mounting groove; the first piston 21 is provided with a first air cavity along the axial direction, and the first air cavity is communicated with the cylinder end cover 4; a plurality of first air inlet holes 23 are formed in one end, far away from the cylinder end cover 4, of the first piston 21 in the radial direction, and the first air inlet holes 23 are communicated with the first air cavity and the first mounting groove; the first baffle 24 is arranged at one end of the first mounting groove, which is close to the cylinder end cover 4, and a first reset spring 22 is arranged between the first baffle 24 and the first piston 21 and used for resetting the first piston 21. A first limiting device 30 is arranged in the first mounting groove between the first baffle 24 and the cylinder end cover 4 and is used for limiting the first baffle 24; preferably, the first stop device 30 is a stop ring, an annular groove is disposed in the first mounting groove, and the stop ring is clamped in the annular groove to stop the first baffle 24.
Referring to fig. 4, a high-gear buffer air supplementing device X is disposed in the second mounting groove, and is configured to provide reverse buffer for the piston assembly 2 during upshifting, and includes a second piston 25, where the second piston 25 is slidably matched with an inner wall of the second mounting groove, and a sealing ring is disposed between the second piston 25 and the inner wall of the second mounting groove; preferably, the end of the second piston 25 is a conical surface structure matched with the end of the second mounting groove; the second piston 25 is provided with a second air cavity along the axial direction, and the second air cavity is led to one end of the cylinder body 1 far away from the cylinder end cover 4; a plurality of second air inlet holes 26 are formed in one end, close to the cylinder end cover 4, of the second piston 25 in the radial direction, and the second air inlet holes 26 are communicated with the second air cavity and the second mounting groove. The second baffle 27 is arranged at one end of the second mounting groove, which is close to the inner wall of the cylinder body 1, and a second reset spring 28 is arranged between the second baffle 27 and the second piston 25 and is used for resetting the second piston 25. A second limiting device 29 is arranged in a second mounting groove between the second baffle 27 and the inner wall of the cylinder block 1 and is used for limiting the second baffle 25; preferably, the second limiting device 29 is a stop ring, an annular groove is arranged in the second mounting groove, and the stop ring is clamped in the annular groove to limit the second baffle 27.
The fourth air hole A or the fifth air hole B is communicated with the second air hole M when moving along with the piston assembly 2 to correspond to the position of the second air hole M.
Preferably, the first baffle 24 and the second baffle 27 are annular plates with hollowed-out middle, and the hollowed-out aperture is larger than the aperture of the fourth air hole a and the aperture of the fifth air hole B; the first return spring 22 is inserted inside the first air chamber; a second return spring 28 is interposed inside the second air chamber; the fourth air hole A and the fifth air hole B are arranged along the radial direction of the piston assembly 2, the fourth air hole A is communicated with a first channel inside the first piston 21 through an axial first air channel, and the fifth air hole B is communicated with a second channel inside the second piston 25 through an axial second air channel; the aperture of the first air hole H and the aperture of the third air hole L are respectively 1.2-1.5 mm, and the aperture of the second air hole M is designed to be two times of the aperture of the first air hole H or the aperture of the third air hole L, namely 2.4-3 mm, so that the device can further play a role in throttling and buffering, and further reduce the speed of impacting the shell.
When in installation, the first piston 21 and the second piston 25 are correspondingly installed in the first installation groove and the second installation groove, are attached to the conical surfaces in the grooves, and are respectively communicated with the corresponding fourth air hole A and fifth air hole B; the first return spring 22 and the second return spring 28 are respectively correspondingly installed in the first air cavity and the second air cavity; the first baffle 24 and the second baffle 27 are correspondingly installed in the first installation groove and the second installation groove respectively, the first limiting and limiting device and the second limiting and limiting device 29 are correspondingly installed in the first installation groove and the second installation groove respectively, the first baffle 24 and the second baffle 27 are limited respectively, and the assembly of the piston assembly 2 is completed.
Working principle: in the working process, when a high gear is engaged, the third air hole L and the second air hole M are used for simultaneously introducing air, and the air introduction is stopped until the gear is engaged in place; similarly, when the gear is shifted down, the first air hole H and the second air hole M are simultaneously charged until the gear is shifted to the position, and then the charging is stopped. The operation principle will be described by taking the example in which the ventilation pressure of the second air hole M is 5bar and the ventilation pressures of the first air hole M and the third air hole L are 7bar, but this is not a limitation.
Referring to fig. 5 and 6, when the high gear is shifted from the low gear: in low gear, the piston assembly 2 is located on the side near the cylinder end cover 4 with clearance from the cylinder end cover 4. For convenience of explanation and understanding, the end close to the cylinder end cover 4 is regarded as the right end, and the end far from the cylinder end cover 4 is regarded as the left end; the ventilation air pressure of the third air hole L and the ventilation air pressure of the second air hole M are respectively 7bar and 5bar, the piston assembly 2 moves towards the left end, the fourth air hole A moves to the corresponding position of the second air hole M along with the piston assembly 2, at the moment, the air flow of the second air hole M can enter the left end of the low-gear buffer air supplementing device Y through the fourth air hole A, meanwhile, the air flow at the third air hole L can enter the right end of the low-gear buffer air supplementing device Y, and the air pressure at the right end is larger than the left end due to the different air pressures at the two ends of the low-gear buffer air supplementing device Y, so that the first piston 21 does not generate displacement under the action of the first mounting groove. When the piston assembly 2 drives the shifting fork 6 to enable the auxiliary box sliding sleeve to start to enter into a gear, the fifth air hole B moves to a position corresponding to the second air hole M along with the piston assembly 2, the fifth air hole B is communicated with the second air hole M, reverse buffering air supplementing is opened, at the moment, the air pressure of 5bar of the air inlet hole of the second air hole M overcomes the spring force of the second reset spring 28, the second piston 25 moves to the left side, the second air hole 26 is opened and is communicated with the second mounting groove and the fifth air hole B, and air flow sequentially enters into the left side of the high-speed buffering air supplementing device X through the second mounting groove, the second air inlet hole 26 and the second air cavity, and as the aperture of the second air hole M is larger than that of the first air hole H, the volume of the reverse air supplementing cavity is small, the air pressure slightly smaller than 5bar can be quickly established at the left side of the high-speed buffering air supplementing device X; at this time, the theoretical gas pressure on the right side is 7bar; the remaining air pressure difference of 2bar will continue to push the piston assembly 2 to move to the left to continue to enter the gear until the shifting fork 6 contacts the front housing 5, and gear shifting is completed. The impact force and the impact speed are greatly reduced in the process, so that the noise generated by the impact of the shifting fork 6 and the front shell 5 is reduced.
Similarly, referring to fig. 7 and 8, when the low gear is shifted from the high gear: in the high gear, the piston assembly 2 is positioned on the side far away from the cylinder end cover 4 and has a gap with the bottom of the cylinder block 1. For convenience of explanation and understanding, the end close to the cylinder end cover 4 is regarded as the right end, and the end far from the cylinder end cover 4 is regarded as the left end; the ventilation air pressure of the first air hole H and the second air hole M is 7bar and 5bar respectively, the right end of the piston assembly 2 moves, the fifth air hole B moves to the corresponding position of the second air hole M along with the piston assembly 2, at the moment, the air flow of the second air hole M enters the right end of the high-speed buffer air supplementing device X through the fifth air hole B, meanwhile, the air flow at the first air hole H enters the left end of the high-speed buffer air supplementing device X, and the air pressure at the left end is larger than the right end due to the fact that the air pressures at the two ends of the high-speed buffer air supplementing device X are different, so that the second piston 25 is tightly attached to the conical surface of the second mounting groove under the action of the first mounting groove. When the piston assembly 2 drives the shifting fork 6 to enable the auxiliary box sliding sleeve to start to move to the right, the fourth air hole A moves to a position corresponding to the second air hole M along with the piston assembly 2, the fourth air hole A is communicated with the second air hole M, reverse buffering air supplementing is opened, at the moment, the air pressure of 5bar of the air inlet hole of the second air hole M overcomes the spring force of the first reset spring 22, the first piston 21 moves to the right, the first air hole 23 is opened and is communicated with the first mounting groove and the fourth air hole A, and air flow sequentially enters the right side of the low-gear buffering air supplementing device Y through the first mounting groove, the first air inlet hole 23 and the first air cavity, and as the aperture of the second air hole M is larger than that of the third air hole L, the air supplementing cavity is small in reverse buffering air supplementing is capable of quickly establishing air pressure slightly smaller than 5bar on the right side of the high-gear buffering air supplementing device Y; at this time, the theoretical air pressure on the left side is 7bar; the remaining air pressure difference of 2bar will continue to push the piston assembly 2 to move to the right to continue to shift gear until the shifting fork 6 contacts the rear housing 9, and gear shifting is completed, and the impact force and the impact speed are greatly reduced, so that noise generated by the impact of the shifting fork 6 and the rear housing 9 is reduced.
The utility model provides a derailleur, includes the AMT cylinder of shifting that above, this derailleur can realize when just advancing the fender in the gear in the process of shifting, when the sliding sleeve combination tooth just gets into the meshing, reverse buffering air supplement forms pressure differential around the piston assembly, reduces the effort of piston assembly greatly, and the force and the speed that finally make shift fork striking casing all reduce greatly to at the in-process of shifting, reduce the noise of striking, have better user experience and feel.
In summary, the present invention provides an AMT shift cylinder and a transmission, in which buffer air-supplementing devices are disposed at two ends of a piston assembly 2 to reduce the impact force and speed between a fork 6 and a front/rear housing during the upshift and downshift movements of the piston assembly 2, so as to achieve the purpose of reducing shift noise and improve user experience.
The foregoing description of the preferred embodiment of the present invention is not intended to limit the technical solution of the present invention in any way, and it should be understood that the technical solution can be modified and replaced in several ways without departing from the spirit and principle of the present invention, and these modifications and substitutions are also included in the protection scope of the claims.

Claims (10)

1. The AMT gear shifting cylinder is characterized by comprising a cylinder body (1) and a cylinder end cover (4), wherein a first air hole (H), a second air hole (M) and a third air hole (L) are sequentially formed in the cylinder body (1), and the cylinder body (1) is connected with the cylinder end cover (4) in a matched mode and is used for sealing the inner space of the cylinder body (1); the cylinder body (1) is internally connected with a piston assembly (2) in a sliding manner, and the piston assembly (2) is connected with a piston fork shaft (3); the piston fork shaft (3) penetrates through the cylinder end cover (4) to be connected with a shifting fork shaft (8), and a front shell (5), a shifting fork (6) and a rear shell (9) are sequentially arranged on the shifting fork shaft (8); a first mounting groove is formed in one end of the piston assembly (2), and a low-gear buffer air supplementing device (Y) is arranged in the first mounting groove and used for providing reverse buffer for the piston assembly (2) during downshifting; the other end of the piston assembly (2) is provided with a second mounting groove, and a high-gear buffer air supplementing device (X) is arranged in the second mounting groove and used for providing reverse buffer for the piston assembly (2) during upshifting; a fourth air hole (A) and a fifth air hole (B) are formed in the piston assembly (2), the fourth air hole (A) is communicated with the first mounting groove, and the fifth air hole (B) is communicated with the second mounting groove; the fourth air hole (A) or the fifth air hole (B) is communicated with the second air hole (M) when moving along with the piston assembly (2) to correspond to the second air hole (M).
2. The AMT shift cylinder according to claim 1, characterized in that said low gear buffer air compensating means (Y) comprises a first piston (21), said first piston (21) being in sliding fit with a first mounting groove inner wall; the first piston (21) is provided with a first air cavity along the axial direction, and the first air cavity is communicated with the cylinder end cover (4); one end of the first piston (21) far away from the cylinder end cover (4) is provided with a plurality of first air inlets (23) along the radial direction, and the first air inlets (23) are communicated with the first air cavity and the first mounting groove.
3. The AMT shift cylinder according to claim 2, characterized in that one end of the first mounting groove close to the cylinder end cover (4) is provided with a first baffle plate (24), and a first return spring (22) is arranged between the first baffle plate (24) and the first piston (21) for resetting the first piston (21).
4. An AMT shift cylinder according to claim 3, characterized in that a first stop device (30) is arranged in a first mounting groove between the first baffle (24) and the cylinder end cover (4) for limiting the first baffle (24).
5. The AMT shift cylinder according to claim 4, characterized in that said high gear buffer air compensating means (X) comprises a second piston (25), said second piston (25) being in sliding fit with the second mounting groove inner wall; the second piston (25) is provided with a second air cavity along the axial direction, and the second air cavity is led to one end of the cylinder body (1) far away from the cylinder end cover (4); and a plurality of second air inlet holes (26) are formed in one end, close to the cylinder end cover (4), of the second piston (25) along the radial direction, and the second air inlet holes (26) are communicated with the second air cavity and the second mounting groove.
6. The AMT shift cylinder as claimed in claim 5, wherein a second baffle plate (27) is provided at an end of the second mounting groove close to an inner wall of the cylinder block (1), and a second return spring (28) is provided between the second baffle plate (27) and the second piston (25) for returning the second piston (25).
7. The AMT shift cylinder as claimed in claim 6, wherein a second limiting device (29) is arranged in a second mounting groove between the second baffle (27) and the inner wall of the cylinder block (1) for limiting the second baffle (27).
8. AMT shift cylinder according to any one of claims 5-7, characterized in that sealing rings are arranged between the first piston (21) and the first mounting groove inner wall, between the second piston (25) and the second mounting groove inner wall, between the piston assembly (2) and the cylinder block (1) inner wall and between the piston fork shaft (3) and the cylinder end cover (4).
9. AMT shift cylinder according to any one of claims 1-7, characterized in that a sealing ring is arranged on the piston assembly (2) between the fourth air hole (a) and the fifth air hole (B) for blocking the air flow between the fourth air hole (a) and the fifth air hole (B).
10. A transmission comprising an AMT shift cylinder as claimed in any one of claims 1 to 9.
CN202211157905.0A 2022-09-22 2022-09-22 AMT gear shifting cylinder and transmission Active CN115614468B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102338217A (en) * 2011-07-18 2012-02-01 吉林大学 Electric control pneumatic mechanical automatic shift system
CN114321354A (en) * 2021-11-17 2022-04-12 陕西法士特齿轮有限责任公司 Cylinder structure with adjustable gear shifting force and adjusting method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014226022A1 (en) * 2014-12-16 2016-06-16 Zf Friedrichshafen Ag Hydraulic actuator for a positive switching element of a transmission
CN209671596U (en) * 2018-12-26 2019-11-22 比亚迪股份有限公司 Synchronizer shifting cylinder
EP3971424A1 (en) * 2020-09-18 2022-03-23 ZF CV Systems Europe BV Pneumatic actuator with magnetic position sensor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102338217A (en) * 2011-07-18 2012-02-01 吉林大学 Electric control pneumatic mechanical automatic shift system
CN114321354A (en) * 2021-11-17 2022-04-12 陕西法士特齿轮有限责任公司 Cylinder structure with adjustable gear shifting force and adjusting method

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