CN117090932A - Pneumatic gear shifting mechanism and gear shifting method thereof - Google Patents
Pneumatic gear shifting mechanism and gear shifting method thereof Download PDFInfo
- Publication number
- CN117090932A CN117090932A CN202311187180.4A CN202311187180A CN117090932A CN 117090932 A CN117090932 A CN 117090932A CN 202311187180 A CN202311187180 A CN 202311187180A CN 117090932 A CN117090932 A CN 117090932A
- Authority
- CN
- China
- Prior art keywords
- electromagnetic valve
- air
- cylinder
- air chamber
- gear
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000007246 mechanism Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000007789 sealing Methods 0.000 claims description 24
- 230000000670 limiting effect Effects 0.000 claims description 20
- 230000007935 neutral effect Effects 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 10
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 230000003287 optical effect Effects 0.000 claims description 9
- 239000013589 supplement Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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
- F16H61/0021—Generation or control of line pressure
-
- 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
- F15B15/1428—Cylinders
-
- 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
- F16H61/0003—Arrangement or mounting of elements of the control apparatus, e.g. valve assemblies or snapfittings of valves; Arrangements of the control unit on or in the transmission gearbox
- F16H61/0009—Hydraulic control units for transmission control, e.g. assembly of valve plates or valve units
-
- 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
-
- 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
- F16H63/40—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 comprising signals other than signals for actuating the final output mechanisms
-
- 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
- F15B2215/00—Fluid-actuated devices for displacing a member from one position to another
- F15B2215/30—Constructional details thereof
Landscapes
- 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 provides a pneumatic gear shifting mechanism and a gear shifting method thereof, wherein the pneumatic gear shifting mechanism comprises a cylinder main body and a cylinder shaft, and a first floating piston and a second floating piston are sequentially sleeved on the cylinder shaft in a sliding manner; the interior of the cylinder main body is divided into a first air chamber, a second air chamber and a third air chamber by a first floating piston and a second floating piston in sequence, a first air inlet and a first air outlet which are communicated with the first air chamber are formed in the cylinder main body, a second air inlet and a second air outlet which are communicated with the third air chamber are communicated with the third air outlet of the second air chamber; the device also comprises a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve and a fourth electromagnetic valve which are respectively communicated with the air circuit. The invention can realize gear engaging, gear disengaging and gear maintaining, can adjust the magnitude of gear shifting force according to the requirement, is particularly suitable for a gearbox of a main gearbox belt synchronizer, and is easy to cause gear shifting delay of the gearbox or early failure of the synchronizer due to different gear shifting forces required by different gears of the gearbox.
Description
Technical Field
The invention relates to the technical field of transmission shifting mechanisms, in particular to a pneumatic shifting mechanism and a shifting method thereof.
Background
The mode of automobile speed change is rapidly developed from manual speed change to automatic speed change, most of automobiles on the market at present are automatic speed change, the essence of automatic speed change is realized by adding a gear shifting executing mechanism on the basis of a purely mechanical gearbox, and the gear shifting executing mechanism is divided into an electric control pneumatic executing mechanism, an electric control hydraulic executing mechanism and an electric control electric executing mechanism from the perspective of a power source. At present, an electric control pneumatic actuating mechanism and an electric control electric actuating mechanism are adopted for gear shifting control in the automobile field, and in the electric control pneumatic actuating mechanism, the electromagnetic valve group is controlled to work, so that the response speed is high, the improvement of the comfort and the drivability of the whole automobile is facilitated, meanwhile, the automobile is provided with an air source, the supply of an additional power source is reduced, and the economical efficiency of fuel oil is improved.
For example, chinese patent literature discloses a pneumatic gear shifting actuating mechanism, including cylinder, casing, the casing is installed in the one end of cylinder, installs the gearshift in the casing, and the gearshift can be moved in the casing under the effect of cylinder, installs the finger of shifting on the gearshift, and the gearshift still nestification has return spring and thrust piece outward, and the thrust piece is located return spring's both ends, and it passes through 2 3/2 solenoid valves, can realize the gear engagement, the gear disengagement to can rely on spring force to keep the neutral gear position.
Above-mentioned scheme, accessible start the promotion shift axle and realize derailleur gear, pick up the fender function to after picking the fender, utilize the spring force of mechanical spring to keep the neutral gear position, but it can't realize keeping in the position except that the neutral gear, and can't be according to the required power of shifting of different gears different, can't adjust the size of power of shifting as required, the gear adjustment state that can realize is limited.
Disclosure of Invention
The invention aims to overcome the defect that the conventional pneumatic gear shifting mechanism cannot adjust the gear shifting force according to the requirement and cannot realize gear retention under different gear shifting forces, and provides a pneumatic gear shifting mechanism and a gear shifting method thereof. The invention can realize gear engagement, gear disengagement and gear retention by opening different electromagnetic valve combinations, and can adjust the gear shifting force as required by controlling the energizing time of the electromagnetic valve and combining the pressure maintaining function of the scheme.
In order to solve the technical problems, the invention adopts the following technical scheme:
the pneumatic gear shifting mechanism comprises a cylinder main body, a cylinder shaft, a first floating piston and a second floating piston, wherein one end of the cylinder shaft penetrates through one side end cover of the cylinder main body and movably penetrates through the cylinder main body, the first floating piston and the second floating piston are sequentially sleeved on the cylinder shaft in a sliding mode, the outer wall of the first floating piston is attached to the inner wall of the cylinder main body, a limiting step positioned between the first floating piston and the second floating piston is further arranged on the inner wall of the cylinder main body, and a limiting boss positioned between the first floating piston and the second floating piston is further arranged on the cylinder shaft;
the interior of the cylinder main body is divided into a first air chamber, a second air chamber and a third air chamber by a first floating piston and a second floating piston in sequence, a first air inlet and a first air outlet which are communicated with the first air chamber are formed in the cylinder main body, a second air inlet and a second air outlet which are communicated with the third air chamber are formed in the cylinder main body, and a third air outlet which is communicated with the second air chamber is also formed in the cylinder main body;
the device further comprises a first electromagnetic valve and a second electromagnetic valve which are respectively communicated with the first air inlet and the second air inlet, and a third electromagnetic valve and a fourth electromagnetic valve which are respectively communicated with the first air outlet and the second air outlet, wherein the third air outlet is communicated with an external air plug.
According to the invention, the first floating piston and the second floating piston are limited at two sides of the interior of the cylinder main body by the limiting steps, and the limiting boss of the cylinder shaft pushes the first floating piston and the second floating piston to move correspondingly when the cylinder shaft moves axially, so that the interior of the cylinder main body is strictly divided into three air chambers by the movable first floating piston and second floating piston, and the gear engaging requirements are flexibly adjusted by controlling the air pressures of different air chambers; the first electromagnetic valve and the second electromagnetic valve are utilized to control the communication between an external air circuit and the first air chamber and the third air chamber, the air chamber is selectively pressurized through the opening and closing of the first electromagnetic valve and the second electromagnetic valve, meanwhile, the third electromagnetic valve and the fourth electromagnetic valve control the conduction between the first air chamber and the third air chamber and the outside, the air chamber is subjected to air discharge and pressure relief through the opening and closing selectivity of the third electromagnetic valve and the fourth electromagnetic valve, different gear shifting forces can be provided for an air cylinder shaft, the pressure of the air chamber can be kept when the electromagnetic valve is closed, the effect of keeping gear is achieved, the gear shifting force is flexible to adjust, and the pressure maintaining of any gear can be realized. The second air chamber is used for adjusting the air pressure difference adjustment when the first floating piston and the second floating piston move, the air pressure is balanced to the second air chamber when the volume of the second air chamber is increased, and the air pressure is balanced to the second air chamber when the volume of the second air chamber is reduced, so that the normal pushing of the first floating piston and the second floating piston can be ensured, and the pressure adjustment of the first air chamber and the second air chamber is realized.
Further, the first floating piston comprises a stepped piston ring, a first air seal piece and a second air seal piece, wherein the outer side wall of the stepped piston ring is matched with the limiting step in shape, and the first air seal piece and the second air seal piece are arranged on the stepped piston ring and are respectively contacted with the cylinder shaft and the cylinder body; the second floating piston has the same structure as the first floating piston.
Thus, the stepped piston ring can form a good limiting effect with the limiting step, the first air seal piece and the second air seal piece are utilized to be respectively sealed on the side wall of one side of the cylinder shaft, which is contacted with the cylinder body, and meanwhile, the sealing effect of each air chamber is ensured.
Further, the cylinder main body comprises a cylinder barrel with two through ends, a cylinder cover and a cylinder base which are respectively connected with the two ends of the cylinder barrel in a sealing mode, and one end of the cylinder shaft penetrates through the cylinder base and slides with the cylinder base in a sealing mode at the pipe. Like this, the cylinder main part adopts split type sealing connection, reduces the production degree of difficulty, the equipment of each spare part of being convenient for.
Further, the first air inlet, the second air inlet, the first air outlet, the second air outlet and the third air outlet are all formed in the cylinder barrel.
Further, the two ends of the cylinder barrel are in sealing connection with the cylinder cover and the cylinder base through the first sealing ring and the second sealing ring, and the cylinder shaft and the cylinder base slide in a sealing manner through the oil seal.
Further, the cylinder shaft comprises an optical axis penetrating through the cylinder body, a supporting piston sleeved at the end part of the optical axis and positioned in the cylinder body, a third sealing ring is arranged between the optical axis and the supporting piston, and the limiting boss is arranged on the supporting piston.
Further, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve are two-position two-way electromagnetic valves.
Further, the automatic transmission further comprises a gear shifting fork which is connected to the other end of the cylinder shaft and used for being connected with a transmission engagement tooth sleeve.
Further, the device also comprises a magnet arranged on the gear shifting fork and a displacement sensor for sensing the magnet.
It should be noted that, the support piston is connected to cylinder axle one end, and the shift fork is installed to the other end, and the shift fork can promote the joint tooth cover of derailleur and slide about, so the cylinder axle moves about and can drive the shift fork and move about, and then drives the joint tooth cover and move about and accomplish the gear shift. In addition, the magnet is arranged on the cylinder shaft, the induction type displacement sensor can sense the position of the magnet, the monitoring function of gear shifting displacement is realized, the magnet can be matched and arranged on the shell of the transmission, and the displacement sensor can be connected with the control system of the transmission to realize monitoring.
The invention also provides a gear shifting method of the pneumatic gear shifting mechanism, which comprises the following operation steps:
shift right: when the gear is shifted to the right, the first electromagnetic valve and the fourth electromagnetic valve are opened, external high-pressure gas enters the first air chamber through the first air inlet, the cylinder shaft moves to the right under the pressure of the high-pressure gas, the second floating piston is driven to move to the right to form a right gear shifting force, normal-pressure gas in the third air chamber is discharged to the outside from the second air outlet through the fourth electromagnetic valve along with the progress of the gear shifting process, and the first electromagnetic valve and the fourth electromagnetic valve are closed after the gear shifting is completed, so that the gear shifting to the right is completed; the magnitude of the gear shifting force can be adjusted by controlling the opening time of the first electromagnetic valve, the first air chamber is still a closed space after the first electromagnetic valve is closed, and the pressure in the first air chamber can realize the gear maintaining function within a certain time; when the vehicle runs in the gear for a long time, the first electromagnetic valve can be opened to supplement air for the first air chamber;
neutral gear picking: when the gear is disengaged, the third electromagnetic valve is firstly opened, the gas in the first air chamber is conducted to the outside through the third electromagnetic valve, then the third electromagnetic valve is closed, the second electromagnetic valve is opened, external high-pressure gas enters the third air chamber through the second electromagnetic valve from the second air inlet, the cylinder shaft and the second floating piston move leftwards under the pressure of the high-pressure gas to form a leftward gear disengaging force, after the second electromagnetic valve is electrified and connected for t seconds, the first electromagnetic valve is opened, external high-pressure gas enters the first air chamber through the first air inlet until the internal air pressure of the first air chamber is the same with that of the third air chamber, the first floating piston and the second floating piston are respectively stopped at limiting steps, and the gear disengaging is completed at the moment; after the neutral gear is removed, the first electromagnetic valve and the second electromagnetic valve are closed, the air passage is disconnected, the first air chamber and the third air chamber are closed and keep certain air pressure, and the neutral gear position is kept under the action of the air pressure at two sides; when necessary, the first electromagnetic valve and the second electromagnetic valve can be opened to supplement air to the air chambers at two sides;
shift to the left: when the gear is shifted leftwards, the second electromagnetic valve and the third electromagnetic valve are opened, external high-pressure gas enters the third air chamber from the second air inlet through the second electromagnetic valve, meanwhile, residual gas in the first air chamber is discharged from the first air outlet through the third electromagnetic valve, the cylinder shaft moves leftwards under the pressure of the high-pressure gas, the first floating piston is driven to move leftwards to form a leftward gear shifting force, and after gear shifting is completed, the second electromagnetic valve and the third electromagnetic valve are powered off to complete left gear shifting; the magnitude of the gear shifting force can be adjusted by controlling the opening time of the second electromagnetic valve; after the second electromagnetic valve is powered off, the third air chamber is still a closed space, and the pressure in the third air chamber can realize a gear maintaining function within a certain time; when the vehicle runs in the gear for a long time, the second electromagnetic valve can be opened to supplement air for the third air chamber.
Compared with the prior art, the invention has the beneficial effects that:
the invention flexibly adjusts the gear engaging requirement by controlling the air pressure of different air chambers, can provide different gear shifting forces for the air cylinder shaft, can realize the pressure maintenance of the air chamber by closing the electromagnetic valve, achieves the effect of gear maintenance, has flexible gear shifting force adjustment, can realize the pressure maintaining of any gear, is particularly suitable for the gearbox with the main gearbox synchronizer, and is easy to cause the gear shifting delay of the gearbox or the early failure of the synchronizer due to different gear shifting forces required by different gears of the gearbox.
Drawings
FIG. 1 is a schematic structural diagram of embodiment 1 of the present invention; wherein the arrows indicate the flow direction of the air flow;
FIG. 2 is a schematic view of a cylinder shaft according to the present invention;
fig. 3 is a schematic application diagram of embodiment 2 in the present invention.
The graphic indicia are illustrated as follows:
1-a cylinder main body, 11-a first air inlet, 12-a first air outlet, 13-a second air inlet, 14-a second air outlet, 15-a third air outlet, 16-a cylinder barrel, 17-a cylinder cover and 18-a cylinder base;
2-cylinder shaft, 21-optical axis, 22-support piston;
the device comprises a first floating piston, a first air seal, a second air seal, a first floating piston, a second floating piston, a 5-limit step and a 6-limit boss, wherein the first air seal is arranged on the first air seal;
71-a first air chamber, 72-a second air chamber, 73-a third air chamber, 81-a first electromagnetic valve, 82-a second electromagnetic valve, 83-a third electromagnetic valve, 84-a fourth electromagnetic valve, 90-a first sealing ring, 92-a second sealing ring, 93-a third sealing ring and 94-an oil seal;
100-of a gear shifting fork, 200-of a magnet, 300-of a displacement sensor, 400-of an engagement tooth sleeve and 500-of a shell.
Detailed Description
The invention is further described below in connection with the following detailed description. Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to be limiting of the present patent; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.
Example 1
As shown in fig. 1 to 2, a pneumatic gear shifting mechanism comprises a cylinder main body 1, a cylinder shaft 2, one end of which penetrates through one side end cover of the cylinder main body 1 and movably penetrates through the cylinder main body 1, a first floating piston 3 and a second floating piston 4 which are sequentially sleeved on the cylinder shaft 2 in a sliding manner, the outer wall of the first floating piston is attached to the inner wall of the cylinder main body 1, a limiting step 5 positioned between the first floating piston 3 and the second floating piston 4 is further arranged on the inner wall of the cylinder main body 1, and a limiting boss 6 positioned between the first floating piston 3 and the second floating piston 4 is further arranged on the cylinder shaft 2;
the interior of the cylinder main body 1 is sequentially divided into a first air chamber 71, a second air chamber 72 and a third air chamber 73 by a first floating piston 3 and a second floating piston 4, a first air inlet 11 and a first air outlet 12 which are communicated with the first air chamber 71 are formed in the cylinder main body 1, a second air inlet 13 and a second air outlet 14 which are communicated with the third air chamber 73 are formed in the cylinder main body 1, and a third air outlet 15 which is communicated with the second air chamber 72 is also formed in the cylinder main body 1;
and further comprises a first electromagnetic valve 81 and a second electromagnetic valve 82 which are respectively communicated with the first air inlet 11 and the second air inlet 13, and a third electromagnetic valve 83 and a fourth electromagnetic valve 84 which are respectively communicated with the first air outlet 12 and the second air outlet 14, and the third air outlet 15 is communicated with an external air plug.
In the embodiment, the first floating piston 3 and the second floating piston 4 are limited at two sides of the interior of the cylinder main body 1 by the limiting step 5, and the limiting boss 6 of the cylinder shaft 2 pushes the first floating piston 3 and the second floating piston 4 to move correspondingly when the cylinder shaft 2 moves axially, so that the interior of the cylinder main body 1 is strictly divided into three air chambers by the movable first floating piston 3 and the movable second floating piston 4, and the gear engaging requirements are flexibly adjusted by controlling the air pressures of different air chambers; the first electromagnetic valve 81 and the second electromagnetic valve 82 are utilized to control the communication between an external air passage and the first air chamber 71 and the third air chamber 73, the air chamber is selectively pressurized by opening and closing the first electromagnetic valve 81 and the second electromagnetic valve 82, meanwhile, the third electromagnetic valve 83 and the fourth electromagnetic valve 84 control the first air chamber 71 and the third air chamber 73 to be communicated with the outside, and the air chamber is selectively subjected to air discharge and pressure relief by opening and closing the third electromagnetic valve 83 and the fourth electromagnetic valve 84, so different shifting forces can be provided for the cylinder shaft 2, the pressure of the air chamber can be kept by closing the electromagnetic valve, the effect of keeping the gear is achieved, the shifting force is flexibly adjusted, and the pressure maintaining of any gear can be realized. The second air chamber 72 is used for adjusting the air pressure difference adjustment when the first floating piston 3 and the second floating piston 4 move, through the connected external air plug, when the volume of the second air chamber 72 is increased, air is introduced into the second air chamber 72 to balance the air pressure, when the volume of the second air chamber 72 is reduced, air is discharged into the second air chamber 72 to balance the air pressure, so that the normal pushing of the first floating piston 3 and the second floating piston 4 can be ensured, and the pressure adjustment of the first air chamber 71 and the second air chamber 72 is realized.
As shown in fig. 1, the first floating piston 3 includes a stepped piston ring having an outer side wall matching the shape of the limit step 5, and first and second air seals 31 and 32 provided on the stepped piston ring and respectively contacting the cylinder shaft 2 and the cylinder body 1; the structure of the second floating piston 4 is the same as that of the first floating piston 3.
Thus, the stepped piston ring can form a good limiting effect with the limiting step 5, and the first air seal 31 and the second air seal 32 are respectively sealed on the side wall of the cylinder shaft 2 and the cylinder body 1, and meanwhile, in order to ensure the sealing effect of each air chamber.
As shown in fig. 1, the cylinder body 1 includes a cylinder tube 16 having both ends penetrating therethrough, a cylinder head 17 and a cylinder base 18 respectively connected to both ends of the cylinder tube 16 in a sealing manner, and one end of the cylinder shaft 2 penetrates the cylinder base 18 and slides in a sealing manner with the cylinder base 18 at a pipe. Like this, cylinder main part 1 adopts split type sealing connection, reduces the production degree of difficulty, the equipment of each spare part of being convenient for.
As shown in fig. 1, the first air inlet 11, the second air inlet 13, the first air outlet 12, the second air outlet 14 and the third air outlet 15 are all opened on the cylinder barrel 16.
As shown in fig. 1, the cylinder head 17 and the cylinder mount 18 are connected to each other at both ends of the cylinder tube 16 by a first seal ring 90 and a second seal ring 92, and the cylinder shaft 2 and the cylinder mount 18 slide in a sealed manner by an oil seal 94.
As shown in fig. 2, the cylinder shaft 2 includes an optical axis 21 penetrating through the cylinder body 1, a support piston 22 sleeved at the end of the optical axis 21 and located in the cylinder body 1, a third sealing ring 93 disposed between the optical axis 21 and the support piston 22, and the limit boss 6 is disposed on the support piston 22.
In this embodiment, the first solenoid valve 81, the second solenoid valve 82, the third solenoid valve 83 and the fourth solenoid valve 84 are two-position two-way solenoid valves.
Example 2
This embodiment is similar to embodiment 1, except that in this embodiment:
as shown in fig. 3, the pneumatic shift mechanism further includes a shift fork 100 connected to the other end of the cylinder shaft 2 for connecting a transmission engagement sleeve 400.
As shown in fig. 3, the pneumatic shift mechanism further includes a magnet 200 provided on the shift fork 100, and a displacement sensor 300 for sensing the magnet 200.
It should be noted that, one end of the cylinder shaft 2 is connected with the supporting piston 22, the other end is provided with the shift fork 100, and the shift fork 100 can push the engaging gear sleeve 400 of the transmission to slide left and right, so that the left and right movement of the cylinder shaft 2 can drive the shift fork 100 to move left and right, and further drive the engaging gear sleeve 400 to move left and right to complete gear shifting. In addition, the magnet 200 is installed on the cylinder shaft 2, the inductive displacement sensor 300 can sense the position of the magnet 200, the monitoring function of gear shifting displacement is realized, the magnet 200 can be installed on the shell 500 of the transmission in a matching way, and the displacement sensor 300 can be connected with a control system of the transmission to realize monitoring.
Other structures and principles of this embodiment are the same as those of embodiment 1.
Example 3
The gear shifting method of the pneumatic gear shifting mechanism specifically comprises the following operation steps:
shift right: when the gear is shifted to the right, the first electromagnetic valve 81 and the fourth electromagnetic valve 84 are opened, external high-pressure gas enters the first air chamber 71 through the first air inlet 11, the cylinder shaft 2 moves to the right under the pressure of the high-pressure gas, the second floating piston 4 moves to the right to form a right gear shifting force, normal-pressure gas in the third air chamber 73 is discharged to the outside through the fourth electromagnetic valve 84 from the second air outlet 14 along with the progress of the gear shifting process, and after the gear shifting is completed, the first electromagnetic valve 81 and the fourth electromagnetic valve 84 are closed to finish the gear shifting to the right; the magnitude of the gear shifting force can be adjusted by controlling the opening time of the first electromagnetic valve 81, the first air chamber 71 is still a closed space after the first electromagnetic valve 81 is closed, and the pressure in the first air chamber 71 can realize the gear maintaining function within a certain time; when the vehicle travels in the gear for a long time, the first electromagnetic valve 81 is opened to replenish the first air chamber 71;
neutral gear picking: when the gear is disengaged, the third electromagnetic valve 83 is firstly opened, the air in the first air chamber 71 is conducted to the outside through the third electromagnetic valve 83, then the third electromagnetic valve 83 is closed, the second electromagnetic valve 82 is opened, external high-pressure air enters the third air chamber 73 through the second electromagnetic valve 82 from the second air inlet 13, the second floating piston 4 and the cylinder shaft 2 move leftwards under the pressure of the high-pressure air to form a leftward gear disengaging force, after the second electromagnetic valve 82 is electrified and connected for t seconds, the first electromagnetic valve 81 is opened, external high-pressure air enters the first air chamber 71 through the first air inlet 11 until the air pressure in the first air chamber 71 is the same as the air pressure in the third air chamber 73, and the first floating piston 3 and the second floating piston 4 are respectively stopped at a limiting step, and the gear disengaging is completed at the moment; after the neutral gear is completely removed, the first electromagnetic valve 81 and the second electromagnetic valve 82 are closed, the air passage is disconnected, the first air chamber 71 and the third air chamber 73 are closed and keep certain air pressure, and the neutral gear position is kept under the action of the air pressure at two sides; when necessary, the first electromagnetic valve 81 and the second electromagnetic valve 82 can be opened to supplement air to the air chambers at the two sides;
shift to the left: when the gear is shifted leftwards, the second electromagnetic valve 82 and the third electromagnetic valve 83 are opened, external high-pressure gas enters the third air chamber 73 from the second air inlet 13 through the second electromagnetic valve 82, meanwhile, residual gas in the first air chamber 71 is discharged from the first air outlet 12 through the third electromagnetic valve 83, the cylinder shaft 2 moves leftwards under the pressure of the high-pressure gas, the first floating piston 3 is driven to move leftwards to form a leftward gear shifting force, and after the gear shifting is finished, the second electromagnetic valve 82 and the third electromagnetic valve 83 are powered off to finish the left gear shifting; the magnitude of the shifting force can be adjusted by controlling the opening time of the second electromagnetic valve 82; after the second electromagnetic valve 82 is powered off, the third air chamber 73 is still a closed space, and the pressure in the third air chamber 73 can realize a gear maintaining function within a certain time; when traveling in this gear for a long period of time, the second electromagnetic valve 82 may be opened to replenish the third air chamber 73.
According to the embodiment, the air pressure of different air chambers is controlled to flexibly adjust the gear engaging requirement, different gear shifting forces can be provided for the air cylinder shaft 2, the electromagnetic valve is closed to achieve pressure maintenance of the air chamber, the gear maintaining effect is achieved, the gear shifting force is adjusted flexibly, and pressure maintaining of any gear can be achieved.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. The pneumatic gear shifting mechanism is characterized by comprising a cylinder main body (1), wherein one end of the cylinder main body penetrates through one side end cover of the cylinder main body (1) and movably penetrates through a cylinder shaft (2) in the cylinder main body (1), a first floating piston (3) and a second floating piston (4) are sequentially sleeved on the cylinder shaft (2) in a sliding mode, the outer wall of the first floating piston is attached to the inner wall of the cylinder main body (1), a limiting step (5) located between the first floating piston (3) and the second floating piston (4) is further arranged on the inner wall of the cylinder main body (1), and a limiting boss (6) located between the first floating piston (3) and the second floating piston (4) is further arranged on the cylinder shaft (2);
the inside of the cylinder main body (1) is sequentially divided into a first air chamber (71), a second air chamber (72) and a third air chamber (73) by the first floating piston (3) and the second floating piston (4), a first air inlet (11) and a first air outlet (12) which are communicated with the first air chamber (71) are formed in the cylinder main body (1), a second air inlet (13) and a second air outlet (14) which are communicated with the third air chamber (73) are formed in the cylinder main body (1), and a third air outlet (15) which is communicated with the second air chamber (72) is formed in the cylinder main body (1);
the air inlet device further comprises a first electromagnetic valve (81) and a second electromagnetic valve (82) which are respectively communicated with the first air inlet (11) and the second air inlet (13), and a third electromagnetic valve (83) and a fourth electromagnetic valve (84) which are respectively communicated with the first air outlet (12) and the second air outlet (14), wherein the third air outlet (15) is communicated with an external air plug.
2. A pneumatic gear shifting mechanism according to claim 1, characterized in that the first floating piston (3) comprises a stepped piston ring with an outer side wall matching the shape of the limit step (5), and a first air seal (31) and a second air seal (32) provided on the stepped piston ring and in contact with the cylinder shaft (2) and the cylinder body (1), respectively; the structure of the second floating piston (4) is the same as that of the first floating piston (3).
3. A pneumatic gear shifting mechanism according to claim 1, characterized in that the cylinder body (1) comprises a cylinder barrel (16) with two ends penetrating, a cylinder head (17) and a cylinder base (18) respectively connected with the two ends of the cylinder barrel (16) in a sealing manner, and one end of the cylinder shaft (2) penetrates through the cylinder base (18) and slides with the cylinder base (18) in a sealing manner at a pipe.
4. A pneumatic gear shifting mechanism according to claim 3, characterized in that the first air inlet (11), the second air inlet (13), the first air outlet (12), the second air outlet (14) and the third air outlet (15) are all open on the cylinder barrel (16).
5. A pneumatic gear shifting mechanism according to claim 3, characterized in that the two ends of the cylinder barrel (16) are connected with the cylinder cover (17) and the cylinder base (18) in a sealing way through a first sealing ring (90) and a second sealing ring (92), and the cylinder shaft (2) and the cylinder base (18) slide in a sealing way through an oil seal (94).
6. A pneumatic gear shifting mechanism according to claim 1, characterized in that the cylinder shaft (2) comprises an optical axis (21) penetrating through the cylinder body (1), a support piston (22) sleeved at the end of the optical axis (21) and located in the cylinder body (1), a third sealing ring (93) is arranged between the optical axis (21) and the support piston (22), and the limit boss (6) is arranged on the support piston (22).
7. A pneumatic gear shifting mechanism according to claim 1, characterized in that the first solenoid valve (81), the second solenoid valve (82), the third solenoid valve (83) and the fourth solenoid valve (84) are two-position two-way solenoid valves.
8. A pneumatic gear shift mechanism according to claim 1, further comprising a shift fork (100) connected to the other end of the cylinder shaft (2) for connecting a transmission engagement sleeve.
9. A pneumatic gear shift mechanism according to claim 8, further comprising a magnet (200) provided on the shift fork (100), and a displacement sensor (300) for sensing the magnet (200).
10. A gear shifting method of a pneumatic gear shifting mechanism according to any of the claims 1-9, characterized in that it comprises in particular the following operating steps:
shift right: when the gear is shifted to the right, the first electromagnetic valve (81) and the fourth electromagnetic valve (84) are opened, external high-pressure gas enters the first air chamber (71) through the first air inlet (11), the air cylinder shaft (2) moves to the right under the pressure of the high-pressure gas, the second floating piston (4) is driven to move to the right to form a right gear shifting force, normal-pressure gas in the third air chamber (73) is discharged to the outside through the fourth electromagnetic valve (84) from the second air outlet (14) along with the progress of the gear shifting process, and after the gear shifting is completed, the first electromagnetic valve (81) and the fourth electromagnetic valve (84) are closed to finish the gear shifting to the right; the magnitude of the gear shifting force can be adjusted by controlling the opening time of the first electromagnetic valve (81), after the first electromagnetic valve (81) is closed, the first air chamber (71) is still a closed space, and the pressure in the first air chamber (71) can realize the gear maintaining function within a certain time; when the vehicle runs in the gear for a long time, the first electromagnetic valve (81) can be opened to supplement air to the first air chamber (71);
neutral gear picking: when the gear is disengaged, firstly, the third electromagnetic valve (83) is opened, the third electromagnetic valve (83) is closed after the gas in the first air chamber (71) is conducted to the outside through the third electromagnetic valve (83), the second electromagnetic valve (82) is opened, external high-pressure gas enters the third air chamber (73) through the second electromagnetic valve (82) from the second air inlet (13), the second floating piston (4) and the cylinder shaft (2) move leftwards under the pressure of the high-pressure gas to form a leftward gear disengaging force, after the second electromagnetic valve (82) is electrified and connected for t seconds, the first electromagnetic valve (81) is opened, external high-pressure gas enters the first air chamber (71) through the first air inlet (11) until the internal air pressure of the first air chamber (71) is the same as that of the internal air pressure of the third air chamber (73), and the first floating piston (3) and the second floating piston (4) are stopped at a limiting step (5) respectively, and the gear disengaging is completed at the moment; after the neutral gear is completely removed, the first electromagnetic valve (81) and the second electromagnetic valve (82) are closed, the air passage is disconnected, the first air chamber (71) and the third air chamber (73) are closed and keep certain air pressure, and the neutral gear position is kept under the action of the air pressure at two sides; when necessary, the first electromagnetic valve (81) and the second electromagnetic valve (82) can be opened to supplement air to the air chambers at two sides;
shift to the left: when the gear is shifted leftwards, the second electromagnetic valve (82) and the third electromagnetic valve (83) are opened, external high-pressure gas enters the third air chamber (73) from the second air inlet (13) through the second electromagnetic valve (82), meanwhile, residual gas in the first air chamber (71) is discharged from the first air outlet (12) through the third electromagnetic valve (83), the cylinder shaft (2) moves leftwards under the pressure of the high-pressure gas, the first floating piston (3) is driven to move leftwards to form a leftwards gear shifting force, and the second electromagnetic valve (82) and the third electromagnetic valve (83) are closed after the gear shifting is completed, so that the left gear shifting is completed; the magnitude of the gear shifting force can be adjusted by controlling the opening time of the second electromagnetic valve (82); after the second electromagnetic valve (82) is powered off, the third air chamber (73) is still a closed space, and the pressure in the third air chamber (73) can realize a gear maintaining function within a certain time; when the vehicle travels in the gear for a long time, the second electromagnetic valve (82) is opened to replenish the air in the third air chamber (73).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311187180.4A CN117090932A (en) | 2023-09-14 | 2023-09-14 | Pneumatic gear shifting mechanism and gear shifting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311187180.4A CN117090932A (en) | 2023-09-14 | 2023-09-14 | Pneumatic gear shifting mechanism and gear shifting method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117090932A true CN117090932A (en) | 2023-11-21 |
Family
ID=88776866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311187180.4A Pending CN117090932A (en) | 2023-09-14 | 2023-09-14 | Pneumatic gear shifting mechanism and gear shifting method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117090932A (en) |
-
2023
- 2023-09-14 CN CN202311187180.4A patent/CN117090932A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2014927B1 (en) | An actuation system for a servo-assisted mechanical transmission with oil leakage recovery | |
| US7779853B2 (en) | Proportional pressure control valve | |
| EP2740977B1 (en) | Switching valve | |
| CN102089555B (en) | Power transmitting device and vehicle having same mounted thereon | |
| CN108413029B (en) | Control device and method for shifting force of pneumatic mechanical automatic transmission | |
| JP2002079839A (en) | Transmission of working vehicle | |
| CN101713439B (en) | Improved multifunctional clutch booster | |
| CN102712312A (en) | Variator fault detection system | |
| CN110325734A (en) | Servo-operated regulator | |
| CN103225690B (en) | The hydrodynamic pressure supplier of speed changer | |
| CN117090932A (en) | Pneumatic gear shifting mechanism and gear shifting method thereof | |
| US9453570B2 (en) | Differential lock with assisted return | |
| EP1821005B1 (en) | Hydraulic servo for a gear change | |
| CN105299219B (en) | Band often closes the double shift transmissions of electric vehicle of clutch | |
| CN211901378U (en) | Electronic pneumatic clutch actuating mechanism and electronic pneumatic clutch actuating system | |
| US5788038A (en) | Anti-gear-hopping device | |
| CN111649129B (en) | Cylinder for realizing gear selection four positions on actuating mechanism of AMT (automated mechanical transmission) | |
| CN106032825A (en) | Vehicle clutch electro-hydraulic automatic control system | |
| CN102648363B (en) | The transmission module of truck | |
| CN201236945Y (en) | Hydraulic system of vehicle electric-controlled automatic mechanical speed variator | |
| CN211259606U (en) | Fluid-driven three-position mechanical gear shifting structure | |
| CN211202855U (en) | Shift boosting air pressure retaining mechanism | |
| JPH0527786B2 (en) | ||
| CN109826945B (en) | Hydraulic automatic flow speed selecting system | |
| CN214788680U (en) | Clutch actuating mechanism and speed change system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |