CN112483560B - Emergency gear shifting system of hydraulic automatic gearbox - Google Patents
Emergency gear shifting system of hydraulic automatic gearbox Download PDFInfo
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- CN112483560B CN112483560B CN202011129172.0A CN202011129172A CN112483560B CN 112483560 B CN112483560 B CN 112483560B CN 202011129172 A CN202011129172 A CN 202011129172A CN 112483560 B CN112483560 B CN 112483560B
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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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/02—Control by fluid pressure
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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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/02—Control by fluid pressure
- F16D2048/0221—Valves for clutch control systems; Details thereof
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- General Engineering & Computer Science (AREA)
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Abstract
The invention relates to an emergency gear shifting system of a hydraulic automatic gearbox, which is characterized in that: the emergency gear shifting system is arranged in the automatic gear shifting system and comprises an emergency valve, a valve body of the emergency valve is provided with an emergency oil supply cavity, a third clutch transfer cavity, a second clutch transfer cavity and a first clutch transfer cavity, and a valve core of the emergency valve can realize the communication of the emergency oil supply cavity with the first clutch transfer cavity, the second clutch transfer cavity and the third clutch transfer cavity; the hydraulic oil circuit is provided with at least one first hydraulic oil circuit which can still continuously provide oil pressure when the automobile is started and the TCU gearbox control unit is not electrified, and the first hydraulic oil circuit is connected into an emergency oil supply cavity of the emergency valve. The invention has the advantages that: corresponding clutches in the automatic gear shifting system are selected, and a rocker slider mechanism is additionally arranged to control the emergency valve, so that hydraulic oil in a hydraulic oil circuit enters the clutches to temporarily supply oil in an emergency state, and emergency gear shifting is achieved.
Description
Technical Field
The invention relates to a hydraulic automatic gearbox, in particular to an emergency gear shifting system of the hydraulic automatic gearbox.
Background
The hydraulic automatic gearbox in the market is widely applied at present, the hydraulic automatic gearbox is in an electro-hydraulic control mode, and the gear shifting process is completed by a TCU (gearbox control unit) through controlling a gear shifting electromagnetic valve of a hydraulic control module in the gearbox. When the TCU is in failure or is powered off due to an emergency, the gearbox can be out of gear, anchored and the like and cannot run. The gearbox is added with an emergency gear to solve the problem. The existing emergency gear mechanism is complex in structure and large in occupied space, and the internal space of gearboxes of some models is small and cannot be directly applied.
Disclosure of Invention
The invention aims to provide a hydraulic automatic gearbox emergency gear shifting system which is compact in structure, safe and reliable.
In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides an emergent shift system of hydraulic automatic transmission which innovation point lies in: the emergency gear shifting system is arranged in an automatic gear shifting system, the automatic gear shifting system comprises a plurality of clutches which are controlled to be separated or combined by a TCU gearbox control unit through a hydraulic control module and a hydraulic oil way in a matching mode, and the clutches at least comprise
The output rotating speed of the automatic gearbox is 0 when the first clutch is independently combined;
the second clutch and the first clutch are combined and matched to control the automatic transmission of the automobile to obtain reverse gear power output;
the third clutch and the second clutch are combined and matched to control the automatic transmission of the automobile to obtain power output of a forward gear;
the emergency gear shifting system comprises
The emergency valve comprises a valve body and a valve core arranged in the valve body, wherein the valve body is provided with an emergency oil supply cavity, a third clutch transfer cavity, a second clutch transfer cavity and a first clutch transfer cavity, the valve core is driven by a rocker arm slider mechanism to realize that the emergency oil supply cavity is simultaneously communicated with the first clutch transfer cavity and the second clutch transfer cavity, or the emergency oil supply cavity is only communicated with the first clutch transfer cavity, or the emergency oil supply cavity is simultaneously communicated with the second clutch transfer cavity and the third clutch transfer cavity; the first clutch transfer cavity, the second clutch transfer cavity and the third clutch transfer cavity are respectively and directly or indirectly communicated with clutch hydraulic cavities of the first clutch, the second clutch and the third clutch;
the hydraulic oil circuit is provided with at least one first hydraulic oil circuit which can still continuously provide oil pressure when the automobile is started and the TCU gearbox control unit is not electrified, and the first hydraulic oil circuit is connected to an emergency oil supply cavity of the emergency valve;
first hydraulic pressure oil circuit loops through emergent oil feed chamber, first clutch transfer chamber and the separation and reunion hydraulic pressure chamber intercommunication of first clutch for first clutch output oil pressure, first hydraulic pressure oil circuit loops through emergent oil feed chamber, the separation and reunion hydraulic pressure chamber intercommunication of second clutch transfer chamber and second clutch for the interim output oil pressure of second clutch, first hydraulic pressure oil circuit loops through emergent oil feed chamber, the separation and reunion hydraulic pressure chamber intercommunication of third clutch for the interim output oil pressure of third clutch.
Preferably, the emergency valve comprises a valve body and a valve core,
the valve body is provided with a cylindrical inner cavity which is through along the axial direction, a third clutch transfer cavity, a second clutch transfer cavity, an emergency oil supply cavity and a first clutch transfer cavity are sequentially arranged on the inner wall of the middle part of the inner cavity at intervals from left to right, and oil outlets corresponding to the third clutch transfer cavity, the second clutch transfer cavity, the emergency oil supply cavity and the first clutch transfer cavity are arranged on the outer surface of the valve body;
the valve core is a cylinder structure which can be just embedded into the cylindrical inner cavity of the valve body and can slide along the axial direction of the cylindrical inner cavity,
the cylinder structure is at least provided with a hydraulic reversing section, the hydraulic reversing section of the cylinder structure is a small-diameter cylinder with the outer diameter smaller than the diameter of the cylindrical inner cavity, and the small-diameter cylinder is provided with an annular body which can be just matched with the cylindrical inner cavity of the valve body to realize sealing;
the cylinder structure is also provided with an operating positioning section which is provided with a first annular positioning groove, a second annular positioning groove and a third annular positioning groove which are sequentially distributed along the axis direction of the cylinder structure;
the valve body is provided with a screw hole corresponding to the position of the valve core operation positioning section, a steel ball, a spring and a screw are sequentially arranged in the screw hole from the inside to the outside of the valve body, and the steel ball is pressed towards the outer surface of the valve core operation positioning section under the action of the screw and the spring;
the valve core can be driven by a rocker slider mechanism to move in the valve body and is matched with the valve body to the following three states:
(1) the steel ball is embedded into the first annular positioning groove of the valve core, the annular body of the valve core is positioned between the third clutch transfer cavity and the second clutch transfer cavity, and the emergency oil supply cavity is simultaneously communicated with the first clutch transfer cavity and the second clutch transfer cavity;
(2) the steel ball is embedded into a second annular positioning groove of the valve core, an annular body of the valve core is positioned between a second clutch transfer cavity and an emergency oil supply cavity, and the emergency oil supply cavity is only communicated with the first clutch transfer cavity;
(3) the steel ball is embedded into a third annular positioning groove of the valve core, an annular body of the valve core is positioned between the emergency oil supply cavity and the first clutch transfer cavity, and the emergency oil supply cavity is communicated with the second clutch transfer cavity and the third clutch transfer cavity simultaneously.
Preferably, the rocker slider mechanism
Comprises a shell, a rotatable manual gear shifting shaft is arranged in the center of the shell, the first end and the second end of the manual gear shifting shaft respectively extend out of the upper end and the lower end of the shell, the first end and the second end of the manual gear shifting shaft are respectively sleeved and connected with an emergency inner pull arm and an emergency outer pull arm through keys,
the emergency stop positioning piece is fixedly connected to the lower end of the shell and provided with an emergency D-stop positioning pin hole, an emergency N-stop positioning pin hole and an emergency R-stop positioning pin hole, the emergency outer pull arm is provided with a pull arm positioning pin hole, and an emergency stop positioning pin which can be inserted into the emergency D-stop positioning pin hole, the emergency N-stop positioning pin hole or the emergency R-stop positioning pin hole is embedded in the pull arm positioning pin hole;
the emergency valve further comprises an emergency connecting rod, one end of the emergency connecting rod is hinged to the end portion of the valve core of the emergency valve through a first emergency pin shaft, and the other end of the emergency connecting rod is hinged to the outer end of the emergency inner pull arm through a second emergency pin shaft.
Preferably, the emergency shift system further includes a second shuttle valve, the second shuttle valve includes a shuttle valve body, and a shuttle valve spool and a spring return assembly which are built in the shuttle valve body, the side surface of the shuttle valve body has a first shuttle valve oil outlet, a second shuttle valve oil outlet, and a shuttle valve oil inlet at the end of the shuttle valve body, and the shuttle valve spool is in the following two states under the action of the spring return assembly:
the first state: the oil inlet has no oil pressure or the oil pressure is smaller than the elastic deformation force of the spring resetting component, the valve core of the shuttle valve is positioned at the first position, the first oil outlet of the shuttle valve and the second oil outlet of the shuttle valve are communicated with each other, and the oil inlet of the shuttle valve is not communicated with the first oil outlet of the shuttle valve and the second oil outlet of the shuttle valve;
and a second state: the oil pressure of an oil inlet of the shuttle valve is larger than the elastic deformation force of the spring reset assembly, a valve core of the shuttle valve is located at a second position, the oil inlet of the shuttle valve is communicated with a second oil outlet of the shuttle valve, and the first oil outlet of the shuttle valve and the second oil outlet of the shuttle valve are not communicated;
an oil inlet of the shuttle valve is communicated with an oil outlet of the transfer cavity of the second clutch, the first oil outlet is connected with a hydraulic oil way of the hydraulic control module, and the second oil outlet is communicated with a clutch hydraulic cavity of the second clutch.
The invention has the advantages that: the emergency valve is controlled by selecting a corresponding clutch in the automatic gear shifting system and additionally arranging a rocker slider mechanism, so that hydraulic oil in a hydraulic oil way enters the clutch to temporarily supply oil in an emergency state, and emergency gear shifting is realized; the emergency valve and the rocker slider mechanism are compact in structure, the requirement for limiting the internal space of the gearbox is met, and the gear shifting mode is stable.
Drawings
Fig. 1 is a schematic structural diagram of an emergency gear shifting system of the hydraulic automatic gearbox.
Fig. 2 is a schematic structural diagram of the emergency valve of the present invention.
Fig. 3 is a front view of the spool of the emergency valve of the present invention.
Fig. 4 is a schematic structural diagram of the rocker-slider mechanism of the present invention.
FIG. 5 is a cross-sectional view of the rocker-slider mechanism of the present invention.
Fig. 6 is a sectional view of an emergency valve and a shuttle valve of the emergency shift system of the 7-speed automatic transmission according to the embodiment of the invention.
Detailed Description
The hydraulic automatic gear shifting system comprises a plurality of clutches which are controlled to be separated or combined by the cooperation of a TCU (transmission control Unit) and a hydraulic oil circuit through a hydraulic control module, wherein the clutches at least comprise
The output rotating speed of the automatic gearbox is 0 when the first clutch is independently combined;
the second clutch and the first clutch are combined and matched to control the automatic transmission of the automobile to obtain reverse gear power output;
and the third clutch and the second clutch are combined and matched to control the automatic transmission of the automobile to obtain the power output of the forward gear.
In the present invention, the second clutch and the third clutch that cooperate to achieve the power output in the forward range are low gears in the forward range as much as possible, but are not limited to 1 st gear and 2 nd gear, which are conventional in the art.
The emergency gear shifting system of the hydraulic automatic gearbox is arranged in an automatic gear shifting system, and comprises a first clutch, a second clutch and a third clutch which need to be used in the hydraulic automatic gear shifting system, as shown in figure 1: an emergency valve 1 and a rocker-arm slide block mechanism 2,
the emergency valve 1 comprises a valve body 11 and a valve core 12 arranged in the valve body 11, wherein the valve body 11 is provided with an emergency oil supply cavity G3, a third clutch transfer cavity Y1, a second clutch transfer cavity Y2 and a first clutch transfer cavity Y3, the valve core 12 is driven by a rocker slider mechanism 2 to realize that the emergency oil supply cavity G3 is simultaneously communicated with the first clutch transfer cavity Y3 and the second clutch transfer cavity Y2, or the emergency oil supply cavity G3 is only communicated with the first clutch transfer cavity Y3, or the emergency oil supply cavity G3 is simultaneously communicated with the second clutch transfer cavity Y2 and the third clutch transfer cavity Y1; the first clutch transfer cavity Y3, the second clutch transfer cavity Y2 and the third clutch transfer cavity Y1 are respectively and directly or indirectly communicated with clutch hydraulic cavities of the first clutch, the second clutch and the third clutch.
It should be noted that: the first clutch transfer chamber Y3, the second clutch transfer chamber Y2, and the third clutch transfer chamber Y1 are respectively and directly or indirectly communicated with clutch hydraulic chambers of the first clutch, the second clutch, and the third clutch, and normally, a flow dividing oil port needs to be additionally arranged on the clutch hydraulic chambers of the first clutch, the second clutch, and the third clutch so as not to interfere with a hydraulic oil path of an original hydraulic oil path.
The hydraulic oil circuit of the hydraulic automatic gear shifting system is provided with at least one first hydraulic oil circuit A which can still continuously provide oil pressure when the automobile is started and the TCU gearbox control unit is not electrified, and the first hydraulic oil circuit is connected into an emergency oil supply cavity G3 of an emergency valve;
the first hydraulic oil way is communicated with a clutch hydraulic cavity of the first clutch sequentially through an emergency oil supply cavity G3 and a first clutch transfer cavity Y3 to output oil pressure of the first clutch;
the first hydraulic oil way is communicated with a clutch hydraulic cavity of the second clutch sequentially through an emergency oil supply cavity G3 and a second clutch transfer cavity Y2 to temporarily output oil pressure of the second clutch;
the first hydraulic oil path is communicated with a clutch hydraulic cavity of the third clutch sequentially through the emergency oil supply cavity G3 and the third clutch transfer cavity Y1 to temporarily output oil pressure of the third clutch.
And then under the unable normal operating condition of TCU, can pass through rocking arm slider mechanism 2 control: the hydraulic oil of the first hydraulic oil line enters the first clutch independently to realize a neutral gear operation mode in an emergency state, or the hydraulic oil of the first hydraulic oil line is controlled to simultaneously enter the second clutch and the first clutch to enable the first clutch and the second clutch to be combined simultaneously, so that a reverse gear power output mode in the emergency state is obtained, or the hydraulic oil of the first hydraulic oil line is controlled to simultaneously enter the second clutch and the third clutch to enable the second clutch and the third clutch to be combined simultaneously, so that a forward gear power output mode in the emergency state is obtained.
As a specific embodiment of the present invention, as shown in fig. 2 and 3, the emergency valve 1 includes a valve body 11 and a valve core 12,
the valve body 11 is provided with a cylindrical inner cavity which penetrates through along the axial direction, a third clutch transfer cavity Y1, a second clutch transfer cavity Y2, an emergency oil supply cavity G3 and a first clutch transfer cavity Y3 are sequentially arranged on the inner wall of the middle part of the inner cavity at intervals from left to right, and oil outlets corresponding to the third clutch transfer cavity Y1, the second clutch transfer cavity Y2, the emergency oil supply cavity G3 and the first clutch transfer cavity Y3 are formed in the outer surface of the valve body 11;
the valve core 12 is a cylinder structure which can be just embedded into the cylindrical inner cavity of the valve body 11 and can slide along the axial direction of the cylindrical inner cavity, the cylinder structure is at least provided with a hydraulic reversing section, the hydraulic reversing section of the cylinder structure is a small-diameter cylinder with the outer diameter smaller than the diameter of the cylindrical inner cavity, and the small-diameter cylinder is provided with an annular body 120 which can be just matched with the cylindrical inner cavity of the valve body 11 to realize sealing. The cylinder structure further has an operation positioning section, which has a first annular positioning groove 121, a second annular positioning groove 122, and a third annular positioning groove 123 (arranged in sequence from right to left in the figure) distributed in sequence along the axis direction of the operation positioning section.
The valve body 11 is provided with a screw hole corresponding to the position of the valve core operation positioning section, a steel ball 111, a spring 112 and a screw 113 are sequentially arranged in the screw hole from the inside to the outside of the valve body, and the steel ball 111 is pressed to the outer surface of the operation positioning section of the valve core 12 under the action of the screw 113 and the spring 112;
the valve core 12 can be driven by the rocker slider mechanism 2 to move in the valve body and is matched with the valve body 11 to the following three states:
(1) the steel ball is embedded into the first annular positioning groove of the valve core, the annular body of the valve core is positioned between the third clutch transfer cavity and the second clutch transfer cavity, and the emergency oil supply cavity is simultaneously communicated with the first clutch transfer cavity and the second clutch transfer cavity;
(2) the steel ball is embedded into a second annular positioning groove of the valve core, an annular body of the valve core is positioned between a second clutch transfer cavity and an emergency oil supply cavity, and the emergency oil supply cavity is only communicated with the first clutch transfer cavity;
(3) the steel ball is embedded into a third annular positioning groove of the valve core, an annular body of the valve core is positioned between the emergency oil supply cavity and the first clutch transfer cavity, and the emergency oil supply cavity is communicated with the second clutch transfer cavity and the third clutch transfer cavity simultaneously.
As a specific embodiment of the present invention, as shown in FIGS. 4 and 5, a rocker slider mechanism 2 is provided
Comprises a shell 21, a rotatable manual gear shifting shaft 22 is arranged in the center of the shell 21, a first end and a second end of the manual gear shifting shaft 22 respectively extend out of the upper end and the lower end of the shell 21, an emergency inner pull arm 24 and an emergency outer pull arm 25 are respectively sleeved on the first end and the second end of the manual gear shifting shaft 22 and are connected with the first end and the second end through keys 23,
an emergency stop positioning piece 26 is fixedly connected to the lower end of the shell 21, an emergency D stop positioning pin hole, an emergency N stop positioning pin hole and an emergency R stop positioning pin hole are formed in the emergency stop positioning piece 26, a pull arm positioning pin hole is formed in the emergency outer pull arm 25, and an emergency stop positioning pin capable of being inserted into the emergency D stop positioning pin hole, the emergency N stop positioning pin hole or the emergency R stop positioning pin hole is embedded in the pull arm positioning pin hole;
the emergency valve further comprises an emergency connecting rod 27, one end of the emergency connecting rod 27 is hinged to the end portion of the valve core 12 of the emergency valve 1 through a first emergency pin shaft 28, and the other end of the emergency connecting rod 27 is hinged to the outer end of the emergency inner pull arm 24 through a second emergency pin shaft 29.
The working principle is as follows:
in an emergency state, pulling the emergency stop positioning pin, and pulling the emergency outer pull arm 25 according to an emergency working condition, so that the emergency stop positioning pin on the emergency stop positioning pin can be aligned to and embedded into an emergency D-stop positioning pin hole, an emergency N-stop positioning pin hole or an emergency R-stop positioning pin hole on the emergency stop positioning piece 26;
the emergency outer pull arm 25 drives the manual gear shifting shaft 22 and the emergency inner pull arm 24 at the upper end thereof to rotate, and the emergency connecting rod 27 drives the valve core 12 to move axially in the valve body 11;
in the moving process of the valve core 12, the steel ball 111 is embedded into the first annular positioning groove 121, the second annular positioning groove 122 or the third annular positioning groove 123 of the valve core 12 by using the spring 112, so that the accurate position of the valve core 12 in the valve body 11 is ensured;
emergency neutral mode:
an emergency outer pull arm is pushed, an emergency stop positioning pin is inserted into an emergency N-stop positioning pin hole, a steel ball is embedded into a second annular positioning groove of the valve core, an annular body of the valve core is positioned between a second clutch transfer cavity and an emergency oil supply cavity, the emergency oil supply cavity is only communicated with a first clutch transfer cavity, a first hydraulic oil way is communicated with a clutch hydraulic cavity of a first clutch sequentially through the emergency oil supply cavity G3 and the first clutch transfer cavity Y3 to output oil pressure of the first clutch, and the first clutch is independently combined to realize a neutral gear operation mode in an emergency state;
emergency reverse gear mode:
an emergency outer pull arm is pushed, an emergency stop positioning pin is inserted into an emergency R stop positioning pin hole, a steel ball is embedded into a first annular positioning groove of a valve core, an annular body of the valve core is positioned between a third clutch transfer cavity and a second clutch transfer cavity, and an emergency oil supply cavity is communicated with the first clutch transfer cavity and the second clutch transfer cavity simultaneously; the first hydraulic oil way is communicated with a clutch hydraulic cavity of the first clutch sequentially through an emergency oil supply cavity G3 and a first clutch transfer cavity Y3 to output oil pressure of the first clutch; the emergency oil supply cavity G3 and the second clutch transfer cavity Y2 are communicated with a clutch hydraulic cavity of the second clutch in sequence to temporarily output oil pressure for the second clutch; simultaneously, the first clutch and the second clutch are combined to control the automatic transmission of the automobile to obtain reverse gear power output;
emergency forward gear mode:
the emergency outer pull arm is pushed, the emergency stop positioning pin is inserted into the emergency D stop positioning pin hole, the steel ball is embedded into a third annular positioning groove of the valve core, an annular body of the valve core is positioned between the emergency oil supply cavity and the first clutch transfer cavity, and the emergency oil supply cavity is communicated with the second clutch transfer cavity and the third clutch transfer cavity at the same time; the first hydraulic oil way is communicated with a clutch hydraulic cavity of the second clutch sequentially through an emergency oil supply cavity G3 and a second clutch transfer cavity Y2 to temporarily output oil pressure of the second clutch; meanwhile, the emergency oil supply cavity G3 and the third clutch transfer cavity Y1 are communicated with a clutch hydraulic cavity of the third clutch in sequence to temporarily output oil pressure for the third clutch, and then the second clutch and the third clutch are combined simultaneously to control the automatic transmission of the automobile to obtain power output of a forward gear.
Examples
In this embodiment, a 7-gear hydraulic automatic transmission is taken as an example, and the automatic transmission has 6 clutches, which are used to explain how the emergency shift system selects the clutch in the original automatic transmission shift system.
The specific gear and clutch relationship is as follows:
note: in the above table, the numbers in C1, C2, C3, C4, C5 and C6 are only the clutch codes commonly used in the art, and the letters and the numbers in R, N, 1, 2, 3, 4, 5, 6 and 7 are only the gear codes commonly used in the art, and are not used as the reference symbols in the drawings.
When the engine is started and the TCU is not electrified, the C3 clutch of the 7-gear hydraulic automatic gearbox can still be combined, the inside of the gearbox is not combined, the transmission ratio cannot be formed, and the output rotating speed is 0, so that the C3 clutch is selected as the first clutch of the invention. A pressure switch is arranged in the first hydraulic oil path corresponding to the C3 clutch, the pressure in the first hydraulic oil path is monitored, and the ECU judges whether the C3 clutch works as expected or not according to the received data transmitted from the pressure switch so as to ensure that key components of the emergency gear-shifting system can work and operate normally.
The C3 clutch and the C5 clutch are combined to realize reverse gear, so the C5 clutch is selected as the second clutch in the invention;
in order to simplify the structure of the emergency valve, at the same time, because the C3 clutch and the C5 clutch are selected, another clutch capable of being combined with one of the C3 clutch and the C5 clutch to form a forward gear is considered, and as can be seen from the table above, the forward gears can be 2 gears, 4 gears, 6 gears and 7 gears, and further, the C1 clutch is selected to be combined with the C3 clutch to realize the 2 gear of the forward gear in view of the power of the emergency forward mode.
In this embodiment, as shown in fig. 6, the emergency shift system of the 7-speed automatic transmission further includes a second shuttle valve 3, the second shuttle valve 3 includes a shuttle valve body 31, and a shuttle valve spool 32 and a spring return assembly 33 that are built in the shuttle valve body 31, the side of the shuttle valve body 31 has a shuttle valve first oil outlet 311 and a shuttle valve second oil outlet 312, the end of the shuttle valve body has a shuttle valve oil inlet 313, and the shuttle valve spool 32 is in the following two states under the action of the spring return assembly 33:
the first state: the oil inlet has no oil pressure or the oil pressure is smaller than the elastic deformation force of the spring resetting component, the valve core of the shuttle valve is positioned at the first position, the first oil outlet of the shuttle valve and the second oil outlet of the shuttle valve are communicated with each other, and the oil inlet of the shuttle valve is not communicated with the first oil outlet of the shuttle valve and the second oil outlet of the shuttle valve;
and a second state: the oil pressure of an oil inlet of the shuttle valve is larger than the elastic deformation force of the spring reset assembly, a valve core of the shuttle valve is located at a second position, the oil inlet of the shuttle valve is communicated with a second oil outlet of the shuttle valve, and the first oil outlet of the shuttle valve and the second oil outlet of the shuttle valve are not communicated;
an oil inlet of the shuttle valve is communicated with an oil outlet of the transfer cavity of the second clutch, the first oil outlet is connected with a hydraulic oil way of the hydraulic control module, and the second oil outlet is communicated with a clutch hydraulic cavity of the second clutch.
The design of the second shuttle valve for reducing the extra branch oil port of the C5 clutch in the transmission is adopted, so that the problem of space limitation near the C5 clutch is avoided.
Claims (4)
1. The utility model provides an emergent shift system of hydraulic automatic transmission which characterized in that: the emergency gear shifting system is arranged in an automatic gear shifting system, the automatic gear shifting system comprises a plurality of clutches which are controlled to be separated or combined by a TCU gearbox control unit through a hydraulic control module and a hydraulic oil way in a matching mode, and the clutches at least comprise
The output rotating speed of the automatic gearbox is 0 when the first clutch is independently combined;
the second clutch and the first clutch are combined and matched to control the automatic transmission of the automobile to obtain reverse gear power output;
the third clutch and the second clutch are combined and matched to control the automatic transmission of the automobile to obtain power output of a forward gear;
the emergency gear shifting system comprises
The emergency valve comprises a valve body and a valve core arranged in the valve body, the valve body is provided with an emergency oil supply cavity, a third clutch transfer cavity, a second clutch transfer cavity and a first clutch transfer cavity, the valve core is driven by a rocker arm slider mechanism to realize that the emergency oil supply cavity is simultaneously communicated with the first clutch transfer cavity and the second clutch transfer cavity, or the emergency oil supply cavity is only communicated with the first clutch transfer cavity, or the emergency oil supply cavity is simultaneously communicated with the second clutch transfer cavity and the third clutch transfer cavity; the first clutch transfer cavity, the second clutch transfer cavity and the third clutch transfer cavity are respectively and directly or indirectly communicated with clutch hydraulic cavities of the first clutch, the second clutch and the third clutch;
the hydraulic oil circuit is provided with at least one first hydraulic oil circuit which can still continuously provide oil pressure when the automobile is started and the TCU gearbox control unit is not electrified, and the first hydraulic oil circuit is connected to an emergency oil supply cavity of the emergency valve;
first hydraulic pressure oil circuit loops through emergent oil feed chamber, first clutch transfer chamber and the separation and reunion hydraulic pressure chamber intercommunication of first clutch for first clutch output oil pressure, first hydraulic pressure oil circuit loops through emergent oil feed chamber, the separation and reunion hydraulic pressure chamber intercommunication of second clutch transfer chamber and second clutch for the interim output oil pressure of second clutch, first hydraulic pressure oil circuit loops through emergent oil feed chamber, the separation and reunion hydraulic pressure chamber intercommunication of third clutch for the interim output oil pressure of third clutch.
2. The automatic hydrodynamic transmission emergency shifting system of claim 1, wherein:
the valve body is provided with a cylindrical inner cavity which is through along the axial direction, a third clutch transfer cavity, a second clutch transfer cavity, an emergency oil supply cavity and a first clutch transfer cavity are sequentially arranged on the inner wall of the middle part of the inner cavity at intervals from left to right, and oil outlets corresponding to the third clutch transfer cavity, the second clutch transfer cavity, the emergency oil supply cavity and the first clutch transfer cavity are arranged on the outer surface of the valve body;
the valve core is a cylinder structure which can be just embedded into the cylindrical inner cavity of the valve body and can slide along the axial direction of the cylindrical inner cavity,
the cylinder structure is at least provided with a hydraulic reversing section, the hydraulic reversing section of the cylinder structure is a small-diameter cylinder with the outer diameter smaller than the diameter of the cylindrical inner cavity, and the small-diameter cylinder is provided with an annular body which can be just matched with the cylindrical inner cavity of the valve body to realize sealing;
the cylinder structure is also provided with an operating positioning section which is provided with a first annular positioning groove, a second annular positioning groove and a third annular positioning groove which are sequentially distributed along the axis direction of the cylinder structure;
the valve body is provided with a screw hole corresponding to the position of the valve core operation positioning section, a steel ball, a spring and a screw are sequentially arranged in the screw hole from the inside to the outside of the valve body, and the steel ball is pressed towards the outer surface of the valve core operation positioning section under the action of the screw and the spring;
the valve core can be driven by a rocker slider mechanism to move in the valve body and is matched with the valve body to the following three states:
the steel ball is embedded into the first annular positioning groove of the valve core, the annular body of the valve core is positioned between the third clutch transfer cavity and the second clutch transfer cavity, and the emergency oil supply cavity is simultaneously communicated with the first clutch transfer cavity and the second clutch transfer cavity;
the steel ball is embedded into a second annular positioning groove of the valve core, an annular body of the valve core is positioned between a second clutch transfer cavity and an emergency oil supply cavity, and the emergency oil supply cavity is only communicated with the first clutch transfer cavity;
the steel ball is embedded into a third annular positioning groove of the valve core, an annular body of the valve core is positioned between the emergency oil supply cavity and the first clutch transfer cavity, and the emergency oil supply cavity is communicated with the second clutch transfer cavity and the third clutch transfer cavity simultaneously.
3. The automatic hydraulic transmission emergency shifting system according to claim 1 or 2, characterized in that: the rocker arm sliding block mechanism
Comprises a shell, a rotatable manual gear shifting shaft is arranged in the center of the shell, the first end and the second end of the manual gear shifting shaft respectively extend out of the upper end and the lower end of the shell, the first end and the second end of the manual gear shifting shaft are respectively sleeved and connected with an emergency inner pull arm and an emergency outer pull arm through keys,
the emergency stop positioning piece is fixedly connected to the lower end of the shell and provided with an emergency D-stop positioning pin hole, an emergency N-stop positioning pin hole and an emergency R-stop positioning pin hole, the emergency outer pull arm is provided with a pull arm positioning pin hole, and an emergency stop positioning pin which can be inserted into the emergency D-stop positioning pin hole, the emergency N-stop positioning pin hole or the emergency R-stop positioning pin hole is embedded in the pull arm positioning pin hole;
the emergency valve further comprises an emergency connecting rod, one end of the emergency connecting rod is hinged to the end portion of the valve core of the emergency valve through a first emergency pin shaft, and the other end of the emergency connecting rod is hinged to the outer end of the emergency inner pull arm through a second emergency pin shaft.
4. The automatic hydrodynamic transmission emergency shifting system of claim 1, wherein:
the emergency gear shifting system further comprises a second shuttle valve, the second shuttle valve comprises a shuttle valve body, a shuttle valve spool and a spring reset assembly, the shuttle valve spool and the spring reset assembly are arranged in the shuttle valve body, a first shuttle valve oil outlet and a second shuttle valve oil outlet are formed in the side face of the shuttle valve body, a shuttle valve oil inlet is formed in the end portion of the shuttle valve body, and the shuttle valve spool is in the following two states under the action of the spring reset assembly:
the first state: the oil inlet has no oil pressure or the oil pressure is smaller than the elastic deformation force of the spring resetting component, the valve core of the shuttle valve is positioned at the first position, the first oil outlet of the shuttle valve and the second oil outlet of the shuttle valve are communicated with each other, and the oil inlet of the shuttle valve is not communicated with the first oil outlet of the shuttle valve and the second oil outlet of the shuttle valve;
and a second state: the oil pressure of an oil inlet of the shuttle valve is larger than the elastic deformation force of the spring reset assembly, a valve core of the shuttle valve is located at a second position, the oil inlet of the shuttle valve is communicated with a second oil outlet of the shuttle valve, and the first oil outlet of the shuttle valve and the second oil outlet of the shuttle valve are not communicated;
an oil inlet of the shuttle valve is communicated with an oil outlet of the transfer cavity of the second clutch, the first oil outlet is connected with a hydraulic oil way of the hydraulic control module, and the second oil outlet is communicated with a clutch hydraulic cavity of the second clutch.
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| CN202011129172.0A CN112483560B (en) | 2020-10-21 | 2020-10-21 | Emergency gear shifting system of hydraulic automatic gearbox |
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| CN202011129172.0A CN112483560B (en) | 2020-10-21 | 2020-10-21 | Emergency gear shifting system of hydraulic automatic gearbox |
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| JPS5643034A (en) * | 1979-09-13 | 1981-04-21 | Fuji Heavy Ind Ltd | Four wheel drive with automatic transmission |
| GB2337090A (en) * | 1998-05-08 | 1999-11-10 | Torotrak Dev Ltd | Hydraulic control circuit for a continuously-variable ratio transmission |
| CN206874809U (en) * | 2017-05-24 | 2018-01-12 | 捷孚传动科技有限公司 | Gear box hydraulic control system |
| CN206874703U (en) * | 2017-05-24 | 2018-01-12 | 捷孚传动科技有限公司 | Hybrid vehicle and its gear box hydraulic control system |
| CN210715895U (en) * | 2019-08-01 | 2020-06-09 | 泸州容大智能变速器有限公司 | Built-in electronic gear shifting hydraulic system of automatic gearbox and gearbox assembly |
| CN110425274B (en) * | 2019-08-01 | 2024-04-26 | 泸州容大智能变速器有限公司 | Control method for built-in electronic gear shifting hydraulic system of automatic gearbox |
| CN110341676A (en) * | 2019-08-01 | 2019-10-18 | 泸州容大智能变速器有限公司 | A kind of automatic gear-box built-in electronic parking control system and its control method |
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