CN111649129B - Cylinder for realizing gear selection four positions on actuating mechanism of AMT (automated mechanical transmission) - Google Patents
Cylinder for realizing gear selection four positions on actuating mechanism of AMT (automated mechanical transmission) Download PDFInfo
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- CN111649129B CN111649129B CN202010475064.2A CN202010475064A CN111649129B CN 111649129 B CN111649129 B CN 111649129B CN 202010475064 A CN202010475064 A CN 202010475064A CN 111649129 B CN111649129 B CN 111649129B
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- 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
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- 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
- F15B15/1409—Characterised by the construction of the motor unit of the straight-cylinder type with two or more independently movable working pistons
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- 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
- F15B15/1438—Cylinder to end cap assemblies
- F15B15/1442—End cap sealings
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- 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
- F15B15/1452—Piston sealings
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- 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
- F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
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- 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
- F16H2061/308—Modular hydraulic shift units, i.e. preassembled actuator units for select and shift movements adapted for being mounted on transmission casing
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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 a cylinder for realizing gear selection on an actuating mechanism of an AMT (automated mechanical transmission), in particular to a cylinder for realizing four positions of gear selection on an actuating mechanism of an AMT (automated mechanical transmission), which solves the problems that when a pneumatic gear selection actuating mechanism is carried, a gear selection self-locking position needs to be added and a displacement sensor is matched, so that the control difficulty is high, the actuating speed is low and the failure rate is high due to the limitation of the conventional cylinder structure. The cylinder is characterized in that: the device comprises a cylinder end cover, a cylinder body and a shell which are sequentially arranged from left to right and are fixedly connected in a sealing manner, a gear selecting shaft which is arranged in an inner cavity of the cylinder body and has two ends respectively connected with the cylinder end cover and the shell in a linear sliding manner, a shaft end movable piston and a middle movable piston which are sleeved on the gear selecting shaft and are respectively positioned at two sides of the gear selecting shaft piston, an A cavity pipe joint arranged on the cylinder end cover, a normally open type vent plug and a C cavity pipe joint arranged on the cylinder body, and a D cavity pipe joint arranged on the shell.
Description
Technical Field
The invention relates to a cylinder for realizing gear selection on an actuating mechanism of an AMT (automated mechanical transmission), in particular to a cylinder for realizing a fourth gear selection position on an actuating mechanism of an AMT.
Background
From the world, more than 95% of European heavy truck commercial vehicles adopt AMT transmissions, the original popularization rate of the United states is low, the market share in recent years is increased rapidly, and more than half of the European heavy trucks adopt AMT transmissions. In contrast, in china, the total market share of AMT transmissions is still very low although they have been popularized for years due to various reasons such as product reliability, technology, cost, etc. With the increasing strictness of domestic emission regulations and the continuous improvement of requirements of drivers on vehicle comfort and economy, AMT transmissions are expected to occupy more and more market shares in the domestic commercial vehicle market in the future.
The conventional power source for driving a gear selecting shaft to realize the gear selecting function on an actuating mechanism of the AMT has three modes of hydraulic, electric and pneumatic; in the development of new generation AMT transmission actuating mechanisms of various manufacturers, the power source is mainly in a pneumatic mode, namely compressed air is used for pushing a piston to move so as to drive a gear selecting shaft to move, and the gear selecting function is realized. However, limited by the structure of the existing cylinder, a single cylinder has at most three gear selecting positions, so that most of the main boxes of the AMT transmissions which adopt a pneumatic power source to drive the gear selecting shaft to realize the gear selecting function are three gear selecting positions.
However, four gear selecting positions are required for a main box of a 6-gear and 12-gear AMT transmission, when the transmission is carried with a pneumatic gear selecting actuating mechanism, the transmission is limited by the structure of the existing air cylinder, a gear selecting self-locking position needs to be added, and the gear selecting displacement sensor is matched to determine the specific position of the current shifting head.
Disclosure of Invention
The invention aims to provide an air cylinder for realizing a fourth gear selection position on an actuating mechanism of an AMT (automated mechanical transmission), and aims to solve the technical problems that when a main box of a 6-gear and 12-gear AMT is carried with a pneumatic gear selection actuating mechanism, a gear selection self-locking position needs to be added and a gear selection displacement sensor is matched to determine the specific position of a current shifting head, the mode needs the mutual matching of the displacement sensor and an electromagnetic valve, the control difficulty is high, the execution speed is low, and the failure rate is high under the conditions of harsh working conditions and unstable driving air pressure.
The invention adopts the technical scheme that an air cylinder for realizing the four-position gear selection on an actuating mechanism of an AMT (automated mechanical transmission) is characterized in that:
the device comprises a cylinder end cover, a cylinder body and a shell which are sequentially arranged from left to right and are hermetically and fixedly connected, and further comprises a gear selecting shaft, a shaft end movable piston, a middle movable piston, a cavity pipe joint A, a normally open type vent plug, a cavity pipe joint C and a cavity pipe joint D;
the two ends of the cylinder body are opened, and a first annular boss is arranged in the inner cavity of the cylinder body;
the gear selecting shaft is arranged in an inner cavity of the cylinder body of the air cylinder and can slide left and right relative to the cylinder body of the air cylinder; two ends of the gear selecting shaft extend out of the cylinder body and are respectively and correspondingly connected with the cylinder end cover and the shell in a linear sliding manner; a coaxial annular boss-shaped gear selecting shaft piston is arranged on the outer cylindrical surface of the gear selecting shaft and is positioned in the inner hole of the first annular boss;
the shaft end movable piston and the middle movable piston are sleeved on the gear selecting shaft and are respectively positioned on the left side and the right side of the gear selecting shaft piston; the shaft end movable piston and the middle movable piston can slide left and right relative to the gear selecting shaft and the cylinder body of the cylinder, the sliding stroke of the shaft end movable piston is limited by the right end face of the end cover of the cylinder and the left end face of the first annular boss, and the sliding stroke of the middle movable piston is limited by the right end face of the first annular boss and the left end face of the shell; the diameter size of the outer cylindrical surface at the matching part of the shaft end movable piston and the cylinder body of the cylinder is equal to the diameter size of the outer cylindrical surface at the matching part of the middle movable piston and the cylinder body of the cylinder;
the cylinder end cover, the cylinder body, the shaft end movable piston and the gear selecting shaft form a closed cavity A; the shaft end movable piston, the cylinder body and the gear selecting shaft form a closed B chamber; the cylinder body, the middle movable piston and the gear selecting shaft form a closed C chamber in a surrounding manner; the middle movable piston, the cylinder body, the shell and the gear selecting shaft form a closed D cavity;
the cavity A pipe joint is arranged on the cylinder end cover, and the cavity A can be communicated with an external air path through the cavity A pipe joint; the normally open type breather plug and the pipe joint of the chamber C are both arranged on the cylinder body of the cylinder, and the chamber B and the chamber C can be respectively and correspondingly communicated with an external air path through the normally open type breather plug and the pipe joint of the chamber C; the D chamber pipe joint is arranged on the shell and can communicate the D chamber with an external air path;
defining: the diameter of the outer cylindrical surface of the gear selecting shaft is X; the diameter of the outer cylindrical surface of the gear selecting shaft piston is Z; then the following equation should be satisfied:
the left and right sides only show the relative positional relationship.
Further, in order to facilitate automatic control, the automatic control system also comprises three electromagnetic valves;
the cavity A pipe joint, the cavity C pipe joint and the cavity D pipe joint are respectively connected with one electromagnetic valve and are communicated with an external air path through the electromagnetic valves.
Furthermore, in order to ensure that the gear selecting shaft moves more stably when the gear selecting shaft slides left and right to select gears, one end of the gear selecting shaft is linearly and slidably connected with the end cover of the cylinder through a first linear bearing, and the left end and the right end of the first linear bearing are communicated with air flow;
the other end of the gear selecting shaft is in linear sliding connection with the shell through a second linear bearing.
Further, an inner seal ring of the shaft end movable piston, an outer seal ring of the gear selecting shaft, an inner seal ring of the middle movable piston, an outer seal ring of the middle movable piston and an inner seal ring of the casing which prevent air flow from flowing left and right are respectively and correspondingly arranged between the shaft end movable piston and the gear selecting shaft, between the shaft end movable piston and the cylinder body, between the gear selecting shaft and the cylinder body, and between the gear selecting shaft and the casing;
the inner sealing ring of the shell is positioned on the right side of the second linear bearing;
the shaft end movable piston inner sealing ring, the shaft end movable piston outer sealing ring, the gear selecting shaft outer sealing ring, the middle movable piston inner sealing ring, the middle movable piston outer sealing ring and the shell inner sealing ring are all K-shaped sealing rings. The device is suitable for working conditions with high driving air pressure and high requirement on control precision.
Further, an inner seal ring of the shaft end movable piston, an outer seal ring of the gear selecting shaft, an inner seal ring of the middle movable piston, an outer seal ring of the middle movable piston and an inner seal ring of the shell for preventing air flow from flowing left and right are respectively and correspondingly arranged between the shaft end movable piston and the gear selecting shaft, between the shaft end movable piston and the cylinder body, between the gear selecting shaft and the cylinder body, and between the gear selecting shaft and the shell;
the inner sealing ring of the shell is positioned on the right side of the second linear bearing;
the shaft end movable piston inner sealing ring, the shaft end movable piston outer sealing ring, the gear selecting shaft outer sealing ring, the middle movable piston inner sealing ring and the middle movable piston outer sealing ring are all O-shaped sealing rings;
the sealing ring in the shell is a K-shaped sealing ring. The device is suitable for working conditions with small driving air pressure and low requirement on control precision.
Furthermore, in order to ensure that the left-right sliding motion of the shaft end movable piston and the middle movable piston is more stable during gear selection, the shaft end movable piston and the middle movable piston are both in a stepped shaft shape with a large end and a small end, and the large ends of the shaft end movable piston and the middle movable piston are both close to one side of the gear selection shaft piston;
the inner cavity of the cylinder end cover is a counter bore blind hole, and the large end of the counter bore blind hole is positioned on the right side; the size of the large end of the counter bore-shaped blind hole is matched with the size of the small end of the shaft end movable piston; the first linear bearing is arranged in the small end of the counter bore blind hole;
the shell is provided with a counter bore-shaped through hole, and the large end of the counter bore-shaped through hole is positioned on the left side; the size of the large end of the counter bore-shaped through hole is matched with the size of the small end of the middle movable piston; and the second linear bearing and the inner sealing ring of the shell are both arranged in the small end of the counter bore-shaped through hole.
Furthermore, an end cover gasket is arranged between the cylinder end cover and the cylinder body and is sealed through the end cover gasket;
a cylinder body gasket is arranged between the cylinder body of the cylinder and the shell and is sealed through the cylinder body gasket;
and the cylinder end cover, the cylinder body and the shell are fixedly connected through bolts. Thus, the sealing is reliable and the connection is simple.
Further, the housing is a housing of a gear selecting and shifting actuating mechanism or a housing of a transmission. In this way, material is saved and the inventive cylinder can be integrated into a gear selection actuator or into a transmission.
The invention has the beneficial effects that:
(1) the cylinder for realizing the fourth gear selection position on the actuating mechanism of the AMT can accurately control the gear selection shaft to stop at any one of the four gear selection positions by controlling the air supply time for the chamber A, the chamber C and the chamber D, so as to realize the fourth gear selection position; therefore, the invention solves the technical problems that when a main box of a 6-gear and 12-gear AMT transmission is carried with a pneumatic gear selection executing mechanism, a gear selection self-locking position needs to be added and a gear selection displacement sensor is matched to determine the specific position of the current shifting head, and the mode needs the mutual matching of the displacement sensor and the electromagnetic valve, has high control difficulty and low execution speed, and has higher failure rate under the conditions of harsh working conditions and unstable driving air pressure. The invention ensures that the transmission with the four gear selecting positions of the main box does not need to change the structure of the main box when carrying the pneumatic actuating mechanism, thereby reducing the design and development difficulty of the actuating mechanism, improving the gear selecting precision, having simple and compact structure, reducing the number of parts and reducing the failure rate of the actuating mechanism compared with the traditional four-position gear selecting mechanism.
(2) The invention preferably also comprises three electromagnetic valves, and the automatic control of the air supply of the chamber A, the chamber C and the chamber D can be realized by controlling the on-off of the three electromagnetic valves, so that the control is convenient; and the gear selection time can be reduced by properly increasing the gas path and the drift diameter of the electromagnetic valve, and the gear shifting speed is improved.
(3) The cylinder of the invention realizes four accurate gear selecting positions by using a single cylinder and three electromagnetic valves, greatly reduces the number of parts and reduces the gear selecting time compared with the traditional structural form.
(4) The invention reduces the design difficulty of the controller and the precision requirement on the displacement sensor.
Drawings
FIG. 1 is a schematic view of the internal structure of an embodiment of the present invention (three solenoid valves are not shown);
FIG. 2 is an external view of an embodiment of the present invention (three solenoid valves not shown);
FIG. 3 is a schematic illustration of a first gear selection position of the embodiment of the present invention (three solenoid valves not shown);
FIG. 4 is a schematic illustration of a second gear selection position of the embodiment of the present invention (three solenoid valves not shown);
FIG. 5 is a schematic illustration of a third gear selection position of the embodiment of the present invention (three solenoid valves not shown);
FIG. 6 is a fourth gear selection position schematic of the embodiment of the present invention (three solenoid valves not shown).
The reference numerals in the drawings are explained as follows:
1-cylinder end cover, 2-end cover gasket, 3-cylinder body, 4-cylinder body gasket, 5-shell, 6-gear selecting shaft, 7-A chamber pipe joint, 8-normally open type breather plug, 9-C chamber pipe joint, 10-D chamber pipe joint, 11-first linear bearing, 12-shaft end movable piston, 13-shaft end movable piston outer sealing ring, 14-shaft end movable piston inner sealing ring, 15-gear selecting shaft outer sealing ring, 16-middle movable piston outer sealing ring, 17-middle movable piston inner sealing ring, 18-middle movable piston, 19-second linear bearing, 20-shell inner sealing ring, 21-bolt, 22-A chamber, 23-B chamber, 24-C chamber and 25-D chamber.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the cylinder for realizing the four-position gear selection on the actuating mechanism of the AMT transmission comprises a cylinder end cover 1, a cylinder body 3 and a shell 5 which are sequentially arranged from left to right and are hermetically and fixedly connected, and further comprises a gear selection shaft 6, a shaft end movable piston 12, a middle movable piston 18, an a chamber pipe joint 7, a normally open type breather plug 8, a C chamber pipe joint 9 and a D chamber pipe joint 10. In the embodiment, an end cover gasket 2 is preferably arranged between the cylinder end cover 1 and the cylinder body 3, and is sealed by the end cover gasket 2; a cylinder liner 4 is arranged between the cylinder body 3 and the shell 5 and is sealed by the cylinder liner 4; the cylinder end cover 1, the cylinder body 3 and the shell 5 are fixedly connected through bolts 21. The housing 5 may be a housing of a gear selecting and shifting actuator, a housing of a transmission, and a housing separately designed for a cylinder of the present invention. The left, right, and the like merely indicate relative positional relationships.
The two ends of the cylinder body 3 are opened, and a first annular boss is arranged in the inner cavity of the cylinder body; the gear selecting shaft 6 is arranged in the inner cavity of the cylinder body 3 and can slide left and right relative to the cylinder body 3; two ends of the gear selecting shaft 6 extend out of the cylinder body 3 and are respectively and correspondingly connected with the cylinder end cover 1 and the shell 5 in a linear sliding manner; and a coaxial annular boss-shaped gear selecting shaft piston is arranged on the outer cylindrical surface of the gear selecting shaft 6 and is positioned in the inner hole of the first annular boss. In order to make the gear selecting shaft 6 move more stably when the gear selecting shaft 6 slides left and right to select gears, in the embodiment, preferably, one end of the gear selecting shaft 6 is linearly and slidably connected with the cylinder end cover 1 through a first linear bearing 11, and the left end and the right end of the first linear bearing 11 are in airflow communication; the other end of the gear selecting shaft 6 is linearly and slidably connected with the shell 5 through a second linear bearing 19. This embodiment so when selecting fender axle 6 one end through first linear bearing 11 and 1 sharp sliding connection of cylinder end cover, require first linear bearing 11 both ends air current intercommunication about the requirement, require first linear bearing 11 can not the confined air promptly, because if first linear bearing 11 confined air, can lead to selecting fender axle 6 to remove in-process axis end formation air-resistor, when selecting fender axle 6 moves left promptly, left end axle head atmospheric pressure rises, when selecting fender axle 6 moves right, left end axle head atmospheric pressure reduces. Besides the connection through the linear bearing shown in the embodiment, two ends of the gear selecting shaft 6 can also be respectively connected with the cylinder end cover 1 and the housing 5 in a linear sliding manner through shaft sleeves.
The shaft end movable piston 12 and the middle movable piston 18 are sleeved on the gear selecting shaft 6 and are respectively positioned on the left side and the right side of the gear selecting shaft piston; the shaft end movable piston 12 and the middle movable piston 18 can slide left and right relative to the gear selecting shaft 6 and the cylinder body 3, the sliding stroke of the shaft end movable piston 12 is limited by the right end face of the cylinder end cover 1 and the left end face of the first annular boss, and the sliding stroke of the middle movable piston 18 is limited by the right end face of the first annular boss and the left end face of the shell 5; the diameter of the outer cylindrical surface of the matching part of the shaft end movable piston 12 and the cylinder body 3 is equal to the diameter of the outer cylindrical surface of the matching part of the middle movable piston 18 and the cylinder body 3. In order to make the sliding movement of the shaft end movable piston and the middle movable piston more stable, the present embodiment preferably has the shaft end movable piston 12 and the middle movable piston 18 both being stepped shafts with a large end and a small end, and the large ends of the shafts being close to one side of the gear selecting shaft piston; the inner cavity of the cylinder end cover 1 is a counter bore blind hole, and the large end of the counter bore blind hole is positioned on the right side; the size of the big end of the counter bore-shaped blind hole is matched with the size of the small end of the shaft end movable piston 12; the first linear bearing 11 is arranged in the small end of the counter bore-shaped blind hole; the shell 5 is provided with a counter bore-shaped through hole, and the large end of the counter bore-shaped through hole is positioned on the left side; the size of the large end of the counter bore-shaped through hole is matched with the size of the small end of the middle movable piston 18; the second linear bearing 19 described above and the housing inner seal ring 20 described below are both disposed in the small end of the counterbore-shaped through hole.
The cylinder end cover 1, the cylinder body 3, the shaft end movable piston 12 and the gear selecting shaft 6 enclose a closed cavity A22; a closed B cavity 23 is enclosed by the shaft end movable piston 12, the cylinder body 3 and the gear selecting shaft 6; the cylinder body 3, the middle movable piston 18 and the gear selecting shaft 6 form a closed C chamber 24; the intermediate movable piston 18, the cylinder block 3, the housing 5 and the gear selecting shaft 6 enclose a closed D-chamber 25. In the present embodiment, preferably, shaft end movable piston inner seal rings 14, shaft end movable piston outer seal rings 13, gear selecting shaft outer seal rings 15, middle movable piston inner seal rings 17, middle movable piston outer seal rings 16 and casing inner seal rings 20 for preventing air flow from flowing left and right are respectively and correspondingly arranged between the shaft end movable piston 12 and the gear selecting shaft 6, between the shaft end movable piston 12 and the cylinder body 3, between the gear selecting shaft piston and the first annular boss, between the middle movable piston 18 and the gear selecting shaft 6, between the middle movable piston 18 and the cylinder body 3, and between the gear selecting shaft 6 and the casing 5, so as to form closed a chamber 22, B chamber 23, C chamber 24 and D chamber 25. In the present embodiment, the inner seal ring 20 is located on the right side of the second linear bearing 19. Under the conditions of high driving air pressure and high control precision requirement, the shaft end movable piston inner sealing ring 14, the shaft end movable piston outer sealing ring 13, the gear selecting shaft outer sealing ring 15, the middle movable piston inner sealing ring 17, the middle movable piston outer sealing ring 16 and the shell inner sealing ring 20 are all K-shaped sealing rings. Under the conditions of small driving air pressure and low requirement on control precision, the shaft end movable piston inner sealing ring 14, the shaft end movable piston outer sealing ring 13, the gear selecting shaft outer sealing ring 15, the middle movable piston inner sealing ring 17 and the middle movable piston outer sealing ring 16 can adopt O-shaped sealing rings, and only the shell inner sealing ring 20 adopts a K-shaped sealing ring.
The cavity A pipe joint 7 is arranged on the cylinder end cover 1, and the cavity A22 can be communicated with an external air path through the cavity A pipe joint; the normally open type breather plug 8 and the C chamber pipe joint 9 are both arranged on the cylinder body 3, and the B chamber 23 and the C chamber 24 can be respectively and correspondingly communicated with an external air path through the normally open type breather plug and the C chamber pipe joint; the D-chamber pipe joint 10 is provided on the housing 5, through which the D-chamber 25 can be communicated with an external air passage. In order to facilitate automatic control of the air supply, the present embodiment preferably further includes three electromagnetic valves (not shown in the drawings); the chamber A pipe joint 7, the chamber C pipe joint 9 and the chamber D pipe joint 10 are respectively connected with an electromagnetic valve and are communicated with an external air path through the electromagnetic valves.
Referring to fig. 3, define: the diameter of the outer cylindrical surface of the gear selecting shaft 6 is X; the diameter of the outer cylindrical surface of the gear selecting shaft piston is Z; the diameter size of the outer cylindrical surface of the matched part of the shaft end movable piston 12 and the cylinder body 3 is equal to Y; in order to stop the selector shaft 6 precisely in any of the four selection positions, the following equation (1) is satisfied:
fig. 2 is an external view of an embodiment of the present invention.
The working process of the gear selection four position is realized by adopting the cylinder disclosed by the invention as follows:
(1) in the case where the selector shaft 6 is initially in any one of the positions shown in fig. 4, 5, and 6, when the solenoid valves connected to the C-chamber coupling 9 and the D-chamber coupling 10 are operated and supplied with air, the air pressures of the C-chamber 24 and the D-chamber coupling 25 are working air pressures, the a-chamber 22 and the B-chamber 23 are normal pressures, the middle movable piston 18 does not move because the air pressures on both sides are equal, and the air pressure of the C-chamber 24 pushes the selector shaft 6 to move to the leftmost end, which drives the thrust force as shown in the following formula (2):
the selector shaft 6 is pushed by the driving thrust to the position shown in fig. 3.
(2) When the solenoid valves connected to the a-chamber pipe joint 7, the C-chamber pipe joint 9, and the D-chamber pipe joint 10 are operated and supplied with air in the case where the shift select shaft 6 is initially in any one of the positions of fig. 3, 5, and 6, the air pressures of the a-chamber 22, the C-chamber 24, and the D-chamber 25 are the operating air pressures, and the B-chamber is the normal pressure. Due to the fact that
Therefore, the circular cross-sectional area of the selector shaft 6 at the right side of the chamber a 22 is smaller than the circular cross-sectional area of the selector shaft 6 at the left side of the chamber C24, as shown in the following formula (3):
the thrust of the chamber a 22 to the right of the gear selection shaft 6 is smaller than the thrust of the chamber C24 to the left of the gear selection shaft 6; and because the diameter dimension Y of the outer cylindrical surface of the matching part of the shaft end movable piston 12 and the cylinder body 3 is far larger than the diameter Z of the outer cylindrical surface of the gear selecting shaft piston on the gear selecting shaft 6, the shaft end movable piston 12 is driven by the chamber A22 to be pressed at the right limit position shown in fig. 4, and the gear selecting shaft 6 is driven by the chamber C to be locked at the position shown in fig. 4.
(3) When the solenoid valves connected to the a-chamber pipe joints 7 and the D-chamber pipe joints 10 are operated and supplied with air in the case where the shift select shaft 6 is initially in any one of the positions of fig. 3, 4, and 6, the rightward thrust of the a-chamber 22 on the shift select shaft 6 is expressed by the following equation (4):
the thrust to the left of the intermediate movable piston 18 by the D chamber 25 is as shown in the following equation (5):
since Y > Z, and
therefore, it is not only easy to use
Therefore, the thrust to the right of the gear selecting shaft 6 from the chamber A22 is smaller than that from the intermediate movable piston 18The D chamber 25 pushes it to the left, and therefore the selector shaft 6 is locked in the position shown in fig. 5 by the driving thrust.
(4) In the case where the selector shaft 6 is initially in any of the positions of fig. 3, 4 and 5, when only the solenoid valve connected to the a-chamber pipe joint 7 is operated and supplied with air, the selector shaft 6 is subjected to only the force of the a-chamber 22 to the right thereof as shown in the following equation (6):
the gear selection shaft 6 is locked in the position shown in fig. 6 by the driving thrust.
It can be seen from the above working process that the four precise gear selecting positions can be realized by using a single cylinder.
Claims (6)
1. The utility model provides a cylinder that is used for realizing selecting on AMT derailleur actuating mechanism and keeps off four positions which characterized in that:
the device comprises a cylinder end cover (1), a cylinder body (3) and a shell (5) which are sequentially arranged from left to right and are hermetically and fixedly connected, and further comprises a gear selecting shaft (6), a shaft end movable piston (12), a middle movable piston (18), an A chamber pipe joint (7), a normally open type vent plug (8), a C chamber pipe joint (9) and a D chamber pipe joint (10);
the two ends of the cylinder body (3) are opened, and a first annular boss is arranged in the inner cavity of the cylinder body;
the gear selecting shaft (6) is arranged in the inner cavity of the cylinder body (3) and can slide left and right relative to the cylinder body (3); two ends of the gear selecting shaft (6) extend out of the cylinder body (3) and are respectively and correspondingly connected with the cylinder end cover (1) and the shell (5) in a linear sliding manner; a coaxial annular boss-shaped gear selecting shaft piston is arranged on the outer cylindrical surface of the gear selecting shaft (6), and the gear selecting shaft piston is positioned in an inner hole of the first annular boss;
the shaft end movable piston (12) and the middle movable piston (18) are sleeved on the gear selecting shaft (6) and are respectively positioned on the left side and the right side of the gear selecting shaft piston; the shaft end movable piston (12) and the middle movable piston (18) can slide left and right relative to the gear selecting shaft (6) and the cylinder body (3), the sliding stroke of the shaft end movable piston (12) is limited by the right end face of the cylinder end cover (1) and the left end face of the first annular boss, and the sliding stroke of the middle movable piston (18) is limited by the right end face of the first annular boss and the left end face of the shell (5); the diameter size of the outer cylindrical surface at the matching part of the shaft end movable piston (12) and the cylinder body (3) is equal to the diameter size of the outer cylindrical surface at the matching part of the middle movable piston (18) and the cylinder body (3);
the cylinder end cover (1), the cylinder body (3), the shaft end movable piston (12) and the gear selecting shaft (6) enclose a closed cavity A (22); a closed B chamber (23) is defined by the shaft end movable piston (12), the cylinder body (3) and the gear selecting shaft (6); a closed C chamber (24) is defined by the cylinder body (3), the middle movable piston (18) and the gear selecting shaft (6); the middle movable piston (18), the cylinder body (3), the shell (5) and the gear selecting shaft (6) enclose a closed D-shaped cavity (25);
the cavity A pipe joint (7) is arranged on the cylinder end cover (1), and the cavity A (22) can be communicated with an external air path through the cavity A pipe joint; the normally open type breather plug (8) and the C chamber pipe joint (9) are arranged on the cylinder body (3), and the B chamber (23) and the C chamber (24) can be respectively and correspondingly communicated with an external air path through the normally open type breather plug and the C chamber pipe joint; the D chamber pipe joint (10) is arranged on the shell (5), and the D chamber (25) can be communicated with an external air path through the D chamber pipe joint;
defining: the diameter of the outer cylindrical surface of the gear selecting shaft (6) is X; the diameter of the outer cylindrical surface of the gear selecting shaft piston is Z; then the following equation should be satisfied:
one end of the gear selecting shaft (6) is linearly and slidably connected with the cylinder end cover (1) through a first linear bearing (11), and the left end and the right end of the first linear bearing (11) are in air flow communication;
the other end of the gear selecting shaft (6) is in linear sliding connection with the shell (5) through a second linear bearing (19);
the shaft end movable piston (12) and the middle movable piston (18) are both in a stepped shaft shape with a large end and a small end, and the large ends of the shaft end movable piston and the middle movable piston are both close to one side of the gear selecting shaft piston;
the inner cavity of the cylinder end cover (1) is a counter bore blind hole, and the large end of the counter bore blind hole is positioned on the right side; the size of the large end of the counter-bore blind hole is matched with the size of the small end of the shaft end movable piston (12); the first linear bearing (11) is arranged in the small end of the counter bore-shaped blind hole;
the shell (5) is provided with a counter bore-shaped through hole, and the large end of the counter bore-shaped through hole is positioned on the left side; the size of the large end of the counter bore-shaped through hole is matched with the size of the small end of the middle movable piston (18); and the second linear bearing (19) and the inner shell sealing ring (20) are arranged in the small end of the counter bore-shaped through hole.
2. The cylinder for realizing the fourth gear selection position on the actuating mechanism of the AMT transmission as recited in claim 1, wherein:
the device also comprises three electromagnetic valves;
and the chamber A pipe joint (7), the chamber C pipe joint (9) and the chamber D pipe joint (10) are respectively connected with one electromagnetic valve, and are communicated with an external air path through the electromagnetic valves.
3. The cylinder for realizing the fourth gear selection position on the actuating mechanism of the AMT transmission as recited in claim 2, wherein:
a shaft end movable piston inner sealing ring (14), a shaft end movable piston outer sealing ring (13), a gear selecting shaft outer sealing ring (15), a middle movable piston inner sealing ring (17), a middle movable piston outer sealing ring (16) and a shell inner sealing ring (20) which prevent air flow from flowing left and right are respectively and correspondingly arranged between the shaft end movable piston (12) and the gear selecting shaft (6), between the shaft end movable piston (12) and the cylinder body (3), between the gear selecting shaft piston and the first annular boss, between the middle movable piston (18) and the gear selecting shaft (6), between the middle movable piston (18) and the cylinder body (3) and between the gear selecting shaft (6) and the shell (5);
the inner shell sealing ring (20) is positioned on the right side of the second linear bearing (19);
and the shaft end movable piston inner sealing ring (14), the shaft end movable piston outer sealing ring (13), the gear selecting shaft outer sealing ring (15), the middle movable piston inner sealing ring (17), the middle movable piston outer sealing ring (16) and the shell inner sealing ring (20) are all K-shaped sealing rings.
4. The cylinder for realizing the fourth gear selection position on the actuating mechanism of the AMT transmission as recited in claim 2, wherein:
a shaft end movable piston inner sealing ring (14), a shaft end movable piston outer sealing ring (13), a gear selecting shaft outer sealing ring (15), a middle movable piston inner sealing ring (17), a middle movable piston outer sealing ring (16) and a shell inner sealing ring (20) which prevent air flow from flowing left and right are respectively and correspondingly arranged between the shaft end movable piston (12) and the gear selecting shaft (6), between the shaft end movable piston (12) and the cylinder body (3), between the gear selecting shaft piston and the first annular boss, between the middle movable piston (18) and the gear selecting shaft (6), between the middle movable piston (18) and the cylinder body (3) and between the gear selecting shaft (6) and the shell (5);
the inner shell sealing ring (20) is positioned on the right side of the second linear bearing (19);
the shaft end movable piston inner sealing ring (14), the shaft end movable piston outer sealing ring (13), the gear selecting shaft outer sealing ring (15), the middle movable piston inner sealing ring (17) and the middle movable piston outer sealing ring (16) are all O-shaped sealing rings;
the sealing ring (20) in the shell is a K-shaped sealing ring.
5. The cylinder for realizing the fourth gear selection position on the actuating mechanism of the AMT transmission as recited in claim 3 or 4, characterized in that:
an end cover gasket (2) is arranged between the cylinder end cover (1) and the cylinder body (3) and is sealed through the end cover gasket (2);
a cylinder body gasket (4) is arranged between the cylinder body (3) and the shell (5), and the cylinder body gasket (4) is used for sealing;
the cylinder end cover (1), the cylinder body (3) and the shell (5) are fixedly connected through bolts (21).
6. The cylinder for realizing the fourth gear selection position on the actuating mechanism of the AMT transmission as recited in claim 5, wherein: the shell (5) is a shell of a gear selecting and shifting actuating mechanism or a shell of a transmission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010475064.2A CN111649129B (en) | 2020-05-29 | 2020-05-29 | Cylinder for realizing gear selection four positions on actuating mechanism of AMT (automated mechanical transmission) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010475064.2A CN111649129B (en) | 2020-05-29 | 2020-05-29 | Cylinder for realizing gear selection four positions on actuating mechanism of AMT (automated mechanical transmission) |
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| Publication Number | Publication Date |
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| CN111649129A CN111649129A (en) | 2020-09-11 |
| CN111649129B true CN111649129B (en) | 2022-05-13 |
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Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62180152A (en) * | 1986-02-05 | 1987-08-07 | Jidosha Kiki Co Ltd | Variable transmission operating device |
| CN100516599C (en) * | 2007-10-31 | 2009-07-22 | 长沙航空工业中南传动机械厂 | Pneumatic gear shifting device |
| CN201386780Y (en) * | 2008-09-16 | 2010-01-20 | 胡如现 | Gear-selecting cylinder positioning device |
| CN103671889A (en) * | 2012-09-20 | 2014-03-26 | 洛阳市黄河软轴控制器股份有限公司 | Multistage gear-shifting execution cylinder |
| CN103711895B (en) * | 2012-09-28 | 2016-08-31 | 北京航天发射技术研究所 | The tandem gearshift of transfer case |
| CN202927023U (en) * | 2012-11-21 | 2013-05-08 | 武汉理工通宇新源动力有限公司 | Car gearbox gear shifting air cylinder |
| CN103148204A (en) * | 2013-03-04 | 2013-06-12 | 潍柴动力股份有限公司 | Gear cylinder and pneumatic gear actuator |
| CN203335824U (en) * | 2013-06-03 | 2013-12-11 | 钱潮轴承有限公司 | Four-gear gear shifting air cylinder of speed changing box for vehicle |
| CN103453132B (en) * | 2013-08-22 | 2015-08-26 | 王建军 | Control mechanism of numerically-controlltransmission transmission |
| CN205479307U (en) * | 2016-01-18 | 2016-08-17 | 北京汽车研究总院有限公司 | Transfer case gearshift and car |
| CN205806443U (en) * | 2016-06-20 | 2016-12-14 | 陕西法士特汽车传动集团有限责任公司 | Low-grade boosting-type auxiliary box cylinder |
| CN106438996A (en) * | 2016-12-07 | 2017-02-22 | 东风商用车有限公司 | Electrically controlled pneumatic gear shifting mechanism of mechanical transmission |
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2020
- 2020-05-29 CN CN202010475064.2A patent/CN111649129B/en active Active
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