CN112145676A - Three-position cylinder actuating mechanism - Google Patents
Three-position cylinder actuating mechanism Download PDFInfo
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- CN112145676A CN112145676A CN202010956090.7A CN202010956090A CN112145676A CN 112145676 A CN112145676 A CN 112145676A CN 202010956090 A CN202010956090 A CN 202010956090A CN 112145676 A CN112145676 A CN 112145676A
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- piston
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- cylinder
- fork shaft
- air chamber
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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
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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
- 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
- F15B15/17—Characterised by the construction of the motor unit of the straight-cylinder type of differential-piston type
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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
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
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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
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
- F15B15/2861—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using magnetic means
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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
- 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
- F16H63/3023—Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by fluid pressure
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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
- F16H2061/307—Actuators with three or more defined positions, e.g. three position servos
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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
- 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
- F16H2063/3076—Selector shaft assembly, e.g. supporting, assembly or manufacturing of selector or shift shafts; Special details thereof
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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)
- Actuator (AREA)
Abstract
The invention discloses a three-position cylinder actuating mechanism which comprises a shifting fork shaft, a cylinder body, a first piston, a second piston and a third piston, wherein the shifting fork shaft is connected with the cylinder body; the shifting fork shaft extends into the inner cavity of the cylinder body from one end of the cylinder body, and the second piston is nested on the shifting fork shaft; the inner diameter of the middle part of the cylinder body is smaller than the inner diameters of the two end parts, the middle part of the peripheral surface of the second piston is in a step convex shape, the second piston is positioned at the step convex part of the middle part of the cylinder body, the first piston and the third piston are positioned at two sides of the second piston, the end parts of the first piston and the third piston are respectively attached to two ends of the step convex part of the second piston, a first air chamber is formed between the first piston and one end of the cylinder body, and a second air chamber is formed between the third piston and the other end of the cylinder body; the first air chamber is communicated with the first air path and the first electromagnetic valve; the second air chamber is communicated with the second air path and the second electromagnetic valve. High-low gear positions can be realized through two gas paths, and the use requirements of the electromagnetic valve can be met.
Description
Technical Field
The invention belongs to the field of automobile engineering, and relates to a three-position cylinder actuating mechanism.
Background
In the field of engineering machinery, engineering vehicles often need a transmission to provide an additional power take-off function so as to meet the power take-off requirement of an auxiliary device of the whole vehicle.
For an AMT (automated mechanical transmission), due to structural limitation, the currently available power takeoff is at most a through shaft rear power takeoff, the through shaft rear power takeoff takes power from a main box intermediate shaft, the speed ratio of the through shaft rear power takeoff is fixed, the shaft diameter of an input shaft of the power takeoff is limited by the structure, and the transmission torque is small; for mechanical transmissions, rear power take-offs are usually used, which take power from the auxiliary box countershaft, the power take-off speed ratio can be changed depending on the main box gear, and the torque transmitted by the rear power take-offs is greater than that transmitted by the through-shafts. For the auxiliary box power take-off structure, in order to realize the parking power take-off function, the general auxiliary box cylinder body needs three positions, namely the middle position, so as to realize the neutral gear of the auxiliary box.
However, in the existing three-position cylinder structure used for the mechanical transmission, the electromagnetic valve can only control two gas paths, and the existing three-position cylinder structure is provided with three gas paths, so that the existing three-position cylinder structure cannot be matched with the electromagnetic valve for use.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a three-position cylinder actuating mechanism which can realize high and low gear positions through two gas paths and can meet the use requirements of an electromagnetic valve.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a three-position cylinder actuating mechanism comprises a shifting fork shaft, a cylinder body, a first piston, a second piston and a third piston;
the first piston, the second piston and the third piston are all positioned in an inner cavity of the cylinder body, the shifting fork shaft extends into the inner cavity of the cylinder body from one end of the cylinder body, and the second piston is nested on the shifting fork shaft; the inner diameter of the middle part of the cylinder body is smaller than the inner diameters of the two end parts, the cylinder body is in a step convex shape, the middle of the peripheral surface of the second piston is in a step convex shape, the second piston is positioned at the step convex part of the middle part of the cylinder body, the first piston and the third piston are positioned at two sides of the second piston, the peripheral surfaces of the first piston and the third piston are radial step surfaces, the step surfaces of the first piston and the third piston are respectively contacted with the two ends of the step convex part of the middle part of the cylinder body, and the end parts of the first piston and the third piston are respectively contacted with the two ends of the step convex part of the;
when the first piston, the second piston and the third piston are close to the middle position of the cylinder body, the end parts of the first piston and the third piston are respectively attached to two ends of the step bulge of the second piston, a first air chamber is formed between the first piston and one end of the cylinder body, and a second air chamber is formed between the third piston and the other end of the cylinder body;
the first air chamber is communicated with a first air path of the air cylinder body, and the first air path is connected with a first electromagnetic valve; the second air chamber is communicated with a second air path of the cylinder body, and the second air path is connected with a second electromagnetic valve.
Preferably, the first solenoid valve and the second solenoid valve are both two-position three-way solenoid valves.
Preferably, a first cylinder cover is connected to cylinder body one end, radially is provided with the auto-lock pin on the first cylinder cover, and the declutch shift shaft runs through first cylinder cover, and the part that the declutch shift shaft is located first cylinder cover is provided with a plurality of radial recesses.
Preferably, the middle part of the cylinder body is provided with a vent hole, the vent hole is connected with a vent plug, and the vent plug is communicated with the middle part of the inner cavity of the cylinder body and the outside air.
Preferably, a first cylinder cover and a second cylinder cover are hermetically installed on two sides of the cylinder body, and the first cylinder cover and the second cylinder cover are both provided with vent grooves which respectively connect the first air chamber and the second air chamber with a first air path and a second air path of the cylinder body.
Preferably, the outer wall of the second piston is provided with an induction magnet, and the outer wall of the cylinder body is provided with a Hall sensor at a position corresponding to the induction magnet.
Preferably, the end part of one end of the shifting fork shaft extending into the cylinder body is provided with a column rod, and the column rod extends out of a cylinder body cover close to one end of the shifting fork shaft extending into the cylinder body and extends into the inductive sensor hermetically connected with the cylinder body cover.
Compared with the prior art, the invention has the following beneficial effects:
according to the three-position cylinder actuating mechanism, the three pistons are arranged in the cylinder body, the three pistons have two outer diameters, the two gas paths are respectively connected with the electromagnetic valve, so that the gas paths can be controlled to simultaneously or independently intake air, the gas chambers on the two sides are controlled to simultaneously inflate, the middle position of the cylinder body can be realized by utilizing the same areas of the first gas chamber and the second gas chamber, the pistons are pushed by controlling the independent inflation of the gas chambers on the two sides, the high-low gear position can be realized through the two gas paths, the use requirements of the electromagnetic valve can be met, and the gear engaging force of the transmission is similar when the positions are changed because the areas of the first gas chamber and the second gas chamber; the mechanical transmission is provided with a rear power takeoff, a transmission auxiliary box can reach the middle position, and the three-position cylinder can realize three positions, so that the three-position cylinder actuating mechanism can meet the use requirement of the mechanical transmission matched with the rear power takeoff.
Furthermore, the two air paths are respectively connected with one electromagnetic valve, so that the air paths can be controlled to simultaneously or independently intake air.
Furthermore, the self-locking pin is arranged, so that the shifting fork shaft is simple in mounting structure and convenient to mount and dismount.
Further, set up the breather plug on the cylinder body, the breather plug guarantees that middle air chamber is connected with external atmosphere constantly, and middle air chamber volume change leads to the piston motion to be obstructed when preventing the piston motion.
Further, the cylinder head is communicated with the air path, and the air inlet direction can be converted into the axial direction, so that the thrust to the piston is increased, and the sensitivity is improved.
Further, through outer wall setting response magnet on the second piston, set up hall sensor at cylinder body outer wall corresponding position to can learn the displacement volume of cylinder body piston through the displacement volume of response magnet.
Furthermore, the plunger extending through the shifting fork shaft extends into the inductive sensor, so that the displacement of the piston of the cylinder body can be obtained through the displacement of the plunger.
Drawings
FIG. 1 is a schematic view of the mid-position of a three-position cylinder actuator of the present invention;
FIG. 2 is a schematic left position view of a three position cylinder actuator of the present invention;
FIG. 3 is a schematic right position view of a three position cylinder actuator of the present invention;
FIG. 4 is a schematic view of the solenoid valve connection of the present invention;
FIG. 5 is a cross-sectional view taken along line Q-Q of FIG. 1 in accordance with the present invention;
FIG. 6 is a schematic diagram of the present invention using a rod to measure the displacement of the piston of the cylinder body.
Wherein: 1-a declutch shift shaft; 2-a first cylinder head; 3-self-locking pin; 4-O type sealing ring; 5-a shift fork shaft bushing; 6-left side gasket; 7-a cylinder body; 8-an electromagnetic valve group; 9-piston liner; 10-a first Y-shaped seal ring; 11-right side gasket; 12-a second cylinder head; 13-fastening bolts; 14-a fastening nut; 15-a third piston; 16-a second piston; 17-a second Y-ring seal; 18-a vent plug; 19-a third Y-ring seal; 20-a fourth Y-shaped seal ring; 21-a first piston; 22-an induction magnet; 23-a hall sensor; 24-an inductive sensor; 25-a first solenoid valve; 26-second solenoid valve.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1, the three-position cylinder actuator according to the present invention includes a fork shaft 1, a cylinder body 7, a first piston 21, a second piston 16, and a third piston 15.
The first piston 21, the second piston 16 and the third piston 15 are all located in an inner cavity of the cylinder body 7, the left end of the shifting fork shaft 1 is connected with a shifting fork through a bolt, the right end of the shifting fork shaft 1 extends into the inner cavity of the cylinder body 7 from the left end of the cylinder body 7 and is fixed through a shifting fork shaft bushing 5, the second piston 16 is nested on the shifting fork shaft 1, and the second piston 16 and the shifting fork shaft 1 are fixed into a whole in the axial direction through a fastening nut 14; the first piston 21 and the third piston 15 are identical in structure and are respectively arranged on two sides of the second piston 16; the outer wall of the middle piston and the inner wall of the left piston are matched through a third Y-shaped sealing ring 19 to realize sealing; the outer wall of the middle piston and the inner wall of the right piston are matched through a second Y-shaped sealing ring 17 to realize sealing; the outer wall of the left piston is matched with the inner wall of the cylinder body 7 through a fourth Y-shaped sealing ring 20 to realize sealing; the outer wall of the right piston is matched with the inner wall of the cylinder body 7 through a first Y-shaped sealing ring 10 to realize sealing; the right end of the shifting fork shaft 1 penetrates through a central hole of the middle piston and is tightly sealed with the fastening nut 14 through thread gluing; the O-shaped sealing ring 4 is arranged in a groove in a central hole of the first cylinder cover 2 and is matched with the outer diameter of the shifting fork shaft 1 to realize sealing; the first cylinder cover 2 and the left end face of the cylinder body 7 are sealed through a left sealing gasket 6; the second cylinder cover 12 and the right end face of the cylinder body 7 are sealed through a right sealing gasket 11 and fixed through a fastening bolt 13; the middle section of the middle piston in the circumferential direction is provided with a circle of groove, a piston bush 9 is arranged on the groove, the piston bush 9 is matched with the inner wall of the middle section of the cylinder body 7 to realize radial positioning, the piston bush 9 is made of wear-resistant materials, the piston bush 9 is a non-closed circular ring, and a groove is formed in the circumferential direction to ensure that the middle air chamber is communicated with each other.
The outer diameters of two ends of the middle piston are the same and smaller than the outer diameter of the middle section of the middle piston, and the middle of the peripheral surface of the second piston 16 is in a step convex shape; the middle of an air chamber of the air cylinder body 7 is in a step convex shape, the inner diameters of two ends of the air cylinder body 7 are the same, and the inner diameter of the middle of the air cylinder body 7 is smaller than the inner diameters of two ends of the air cylinder body 7; the second piston 16 is located at the step bulge in the middle of the cylinder body 7, the first piston 21 and the third piston 15 are located on two sides of the second piston 16, the peripheral surfaces of the first piston 21 and the third piston 15 are radial step surfaces, the step surfaces of the first piston 21 and the third piston 15 are respectively contacted with two ends of the step bulge in the middle of the cylinder body 7, and the end parts of the first piston 21 and the third piston 15 are respectively contacted with two ends of the step bulge of the second piston 16.
Three pistons in the cylinder body, three pistons have two kinds of external diameters, have consequently reduced a piston and a sealing washer, two kinds of key parts altogether, have saved the cost.
The left side piston, the right side piston, form middle air chamber between middle piston and the 7 interlude of cylinder body, piston outside diameter all is less than cylinder body 7 internal diameter in 7 interlude of cylinder body and right side piston, middle piston interlude external diameter also is less than cylinder body 7 interlude internal diameter, so at the left side piston, the right side piston, form middle air chamber between middle piston and the 7 interlude of cylinder body, piston bush 9 is installed in middle piston interlude recess, because piston bush 9 is the unclosed ring, can make the air chamber that left side piston and cylinder body 7 formed and the air chamber that right side piston and cylinder body 7 formed communicate, constitute middle air chamber jointly, outside middle air chamber, there is the air vent on the wall of cylinder body 7, install breather plug 18 on the air vent, guarantee middle air chamber and external atmosphere intercommunication.
The first cylinder cover 2 is radially provided with a self-locking pin 3, and a spring and a steel ball are integrated in the self-locking pin 3 and are arranged on the first cylinder cover 2 through threads; the steel ball of the self-locking pin 3 is matched with a corresponding radial groove on the shifting fork shaft 1. Wear-resisting bush is installed to 2 central through-holes of first cylinder cap for the radial positioning of declutch shift shaft 1 avoids declutch shift shaft 1 and 2 contact wear of first cylinder cap simultaneously, and the sealing washer is installed to 2 central through-hole recesses of first cylinder cap, is used for sealed first cylinder cap 2 and declutch shift shaft 1.
The sealing ring between the left piston and the wall of the cylinder body 7 is the same as the sealing ring between the right piston and the wall of the cylinder body 7; the sealing ring between the left piston and the outer wall of the middle piston is the same as the sealing ring between the right piston and the outer wall of the middle piston.
The electromagnetic valve group 8 is installed on the cylinder body 7, static sealing can be achieved through a sealing ring or a sealing gasket, two sets of mutually perpendicular vent grooves are machined in the cylinder body 7, the vent grooves are machined in one side, close to each air chamber, of the first cylinder cover 2 and the second cylinder cover 12, and air chambers on two sides are communicated with air paths controlled by each electromagnetic valve. The solenoid valve group 8 integrates two identical first solenoid valves 25 and second solenoid valves 26, the first solenoid valves 25 and the second solenoid valves 26 are two-position three-way solenoid valves, the first solenoid valves 25 and the second solenoid valves 26 can be independently controlled, air chambers on two sides of the cylinder body 7 are communicated with the atmosphere in a power-off state, and the principle is as shown in fig. 4.
The working process of the three-position cylinder actuating mechanism is as follows:
as shown in fig. 1-3, three positions of the three-position cylinder actuator, left, center and right. The left position corresponds to the high gear area of the cylinder body 7 of the auxiliary box, the middle position is the idle gear area of the auxiliary box, and the right position is the low gear area of the cylinder body 7 of the auxiliary box. Fig. 1 shows the middle position of the three-position cylinder actuator, fig. 2 shows the left position of the three-position cylinder actuator, and fig. 3 shows the right position of the three-position cylinder actuator.
If the parking power take-off requirement does not exist, the auxiliary box cylinder body 7 only needs to be switched between a high gear and a low gear, and an intermediate position is not needed. Assuming that the cylinder body 7 of the auxiliary box is at the high-gear position at present, when the position of the low-gear area is needed, namely the three-position actuator is switched from the left position to the right position, the first electromagnetic valve 25 is powered on, the left air passage is opened, the air chamber at the left side of the cylinder body 7 builds air pressure to push the left piston and the middle piston to move right, meanwhile, the declutch shift shaft 1 and the middle piston as a whole also move right, when the left piston moves to the end face of the left step in the cylinder body 7, the left movement is stopped, as shown in fig. 1, at the moment, the declutch shift shaft 1, the middle piston and the like continue to move right until the positions shown in fig. 3, namely the position of the low-. On the contrary, when the high gear area position is needed, the second electromagnetic valve 26 is powered on, the right gas path is opened, the gas chamber on the right side of the cylinder body 7 establishes gas pressure to push the declutch shift shaft 1, the right piston, the middle piston and the like to move leftwards as a whole, when the piston moves to the position shown in fig. 1, the right piston stops moving when reaching the end face of the right step in the cylinder body 7, the middle piston and the declutch shift shaft 1 continue to move leftwards until the position shown in fig. 2, namely the high gear area position of the auxiliary box, and at this moment, the second electromagnetic valve 26 can be powered.
If a parking power take-off request is made, firstly, the main box of the transmission is switched to a neutral position, no matter the auxiliary box is positioned at a high-gear area or a low-gear area, only the first electromagnetic valve 25 and the second electromagnetic valve 26 need to be activated simultaneously, at the moment, air chambers at two sides of the cylinder body 7 simultaneously establish air pressure, if the auxiliary box is positioned at the high-gear area, as shown in figure 2, because the area sum of a left piston and a middle piston is subtracted by the sectional area of the shifting fork shaft 1 and is larger than the area of the middle piston, the right resultant force generated by pressure difference can overcome friction resistance and load resistance to push the shifting fork shaft 1, the middle piston, the left piston and the like to move rightwards as a whole, and when the auxiliary box is moved to the position shown in figure 1, the area of the right air chamber is the sum of the area of the middle piston and the area of the right piston, The left piston, the right piston and the like stop at the positions shown in fig. 1, namely the middle position of the auxiliary box, namely the neutral position of the auxiliary box, at the moment, the first electromagnetic valve 25 and the second electromagnetic valve 26 can be simultaneously powered off, then a gear engaging air hole of the power takeoff can be switched on, the gear engaging action of the power takeoff is completed, then a proper transmission gear is selected according to requirements, and the power takeoff can enter a parking power takeoff working state. If the sub-tank is located at the low range position, as shown in fig. 3, and the first solenoid valve 25 and the second solenoid valve 26 are simultaneously activated, it is found by analyzing the force that the pressure of the air chamber at the right side of the cylinder body 7 is greater than the pressure at the left side, so that the right side piston and the shift fork 1, the middle piston, etc. as a whole will move to the left side to the position shown in fig. 1, at which time the right side piston stops moving, and it is found by analyzing the shift fork 1, the middle piston, and the left side piston, as a whole, that the left side pressure is greater than the right side pressure, so that the shift fork 1, the middle piston, the left side piston, etc. will also stop at the position shown in fig. 1, which is the sub-tank middle position, i.e. the sub-tank neutral position, at which time the first solenoid valve 25 and the second solenoid valve 26 can be simultaneously de-energized, and then the power, the power takeoff can enter a parking power takeoff working state.
As shown in fig. 5, the induction magnet 22 is installed in the arc-shaped groove of the middle piston, and is close to the right side of the induction magnet 22 and is at a certain distance from the induction magnet 22, and a displacement sensor is arranged on the wall of the cylinder body 7; the induction magnet 22 is installed below the piston bush 9. The displacement of the piston of the cylinder body 7 can be known from the displacement of the induction magnet 22.
As shown in fig. 6, a section of elongated cylindrical rod is arranged on the fastening nut 14 for fastening the fork shaft 1 and the intermediate piston, a through hole is processed at the center of the second cylinder cover 12, a displacement sensor is installed at the right side of the second cylinder cover 12, the elongated cylindrical rod of the fastening nut 14 can penetrate through the through hole at the center of the second cylinder cover 12 and extend into the inductive sensor 24, and the inductive sensor 24 can measure the piston displacement of the cylinder body 7 by detecting the extending length of the elongated cylindrical rod.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (7)
1. A three-position cylinder actuating mechanism is characterized by comprising a shifting fork shaft (1), a cylinder body (7), a first piston (21), a second piston (16) and a third piston (15);
the first piston (21), the second piston (16) and the third piston (15) are all located in an inner cavity of the cylinder body (7), the shifting fork shaft (1) extends into the inner cavity of the cylinder body (7) from one end of the cylinder body (7), and the second piston (16) is nested on the shifting fork shaft (1); the inner diameter of the middle part of the cylinder body (7) is smaller than the inner diameters of the two end parts and is in a step convex shape, the middle of the peripheral surface of the second piston (16) is in a step convex shape, the second piston (16) is positioned at the step convex part of the middle part of the cylinder body (7), the first piston (21) and the third piston (15) are positioned at two sides of the second piston (16), the peripheral surfaces of the first piston (21) and the third piston (15) are radial step surfaces, the step surfaces of the first piston (21) and the third piston (15) are respectively contacted with the two ends of the step convex part of the middle part of the cylinder body (7), and the end parts of the first piston (21) and the third piston (15) are respectively contacted with the two ends of the step convex part of the second piston (16);
when the first piston (21), the second piston (16) and the third piston (15) are close to the middle position of the cylinder body (7), the end parts of the first piston (21) and the third piston (15) are respectively attached to the two ends of the step bulge of the second piston (16), a first air chamber is formed between the first piston (21) and one end of the cylinder body (7), and a second air chamber is formed between the third piston (15) and the other end of the cylinder body (7);
the first air chamber is communicated with a first air path of the cylinder body (7), and the first air path is connected with a first electromagnetic valve (25);
the second air chamber is communicated with a second air path of the cylinder body (7), and the second air path is connected with a second electromagnetic valve (26).
2. Three-position cylinder actuator according to claim 1, characterized in that the first solenoid valve (25) and the second solenoid valve (26) are both two-position three-way solenoid valves.
3. The three-position cylinder actuator according to claim 1, characterized in that one end of the cylinder body (7) is connected with the first cylinder cover (2), the first cylinder cover (2) is radially provided with a self-locking pin (3), the fork shaft (1) penetrates through the first cylinder cover (2), and the part of the fork shaft (1) positioned in the first cylinder cover (2) is provided with a plurality of radial grooves.
4. The three-position cylinder actuator according to claim 1, characterized in that a vent hole is arranged in the middle of the cylinder body (7), a vent plug (18) is connected to the vent hole, and the vent plug (18) is communicated with the middle of the inner cavity of the cylinder body (7) and the outside air.
5. The three-position cylinder actuator according to claim 1, wherein the first cylinder cover (2) and the second cylinder cover (12) are hermetically mounted on two sides of the cylinder body (7), and the first cylinder cover (2) and the second cylinder cover (12) are provided with vent grooves respectively connecting the first air chamber and the second air chamber with the first air path and the second air path of the cylinder body (7).
6. The three-position cylinder actuator according to claim 1, characterized in that the outer wall of the second piston (16) is provided with an induction magnet (22), and the outer wall of the cylinder body (7) is provided with a hall sensor (23) at a position corresponding to the induction magnet (22).
7. The three-position cylinder actuator according to claim 1, characterized in that the end of the fork shaft (1) extending into the cylinder body (7) is provided with a stud which extends from the cylinder body (7) cover near the end of the fork shaft (1) extending into the cylinder body (7) and into an inductive sensor (24) which is sealingly connected to the cylinder body (7) cover.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010956090.7A CN112145676A (en) | 2020-09-11 | 2020-09-11 | Three-position cylinder actuating mechanism |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010956090.7A CN112145676A (en) | 2020-09-11 | 2020-09-11 | Three-position cylinder actuating mechanism |
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| CN112145676A true CN112145676A (en) | 2020-12-29 |
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| CN202010956090.7A Pending CN112145676A (en) | 2020-09-11 | 2020-09-11 | Three-position cylinder actuating mechanism |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116123281A (en) * | 2022-12-17 | 2023-05-16 | 陕西法士特齿轮有限责任公司 | Gear shifting cylinder assembly with unidirectional on-off functional component |
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| CN116123281B (en) * | 2022-12-17 | 2024-09-13 | 陕西法士特齿轮有限责任公司 | Gear shifting cylinder assembly with unidirectional on-off functional component |
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