JP2011185295A - Electronic synchronous transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic synchronous transmission reducing the addition of components to attain the temperature rise of lubricating oil without worsening fuel consumption. <P>SOLUTION: The electronic synchronous transmission includes a lubricating oil temperature sensor 8 detecting the temperature of lubricating oil L; a vehicle driving state detecting means 9 detecting the driving state of a vehicle; a shift period detecting means 10 detecting whether a shift control means 7 is in a shift period; and a lubricating oil temperature rise control means 11 operating a countershaft brake 6 to raise the temperature of the lubricating oil L if the driving state of the vehicle is in a speed reducing state and the shift control means 7 is not in the shift period when the temperature of the lubricating oil is a set value or less. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electronic synchronous transmission that adjusts the rotation speed of a countershaft by electronic control, and relates to an electronic synchronous transmission that can increase the temperature of lubricating oil without deteriorating fuel consumption and with fewer parts added.

  As shown in FIG. 2, in the electronic synchronous transmission 21, a plurality of counter gears 3 are provided on a counter shaft 2 to which power from an engine (not shown) is transmitted via a clutch (not shown). A plurality of main gears 23 that are always meshed with the counter gears 3 are rotatably provided on the main shaft 22 arranged in parallel to the main shaft 22. Each main gear 23 is accompanied by a dog gear (not shown) that rotates together with the main gear 23. Further, a sleeve (not shown) that rotates together with the main shaft 22 is provided on the main shaft 22 so as to be axially movable. . When the sleeve moves axially with any of the dog gears, the rotation of the counter shaft 2 is transmitted to the main shaft 22. The main shaft 22 is free with respect to the countershaft 2 in a state in which the gear is disengaged during the shift period. Since the main shaft 22 is connected to an output shaft (not shown) via a gear, the main shaft 22 rotates in proportion to the vehicle speed.

  At this time, when the rotation speed of the dog gear is higher than the rotation speed of the sleeve corresponding to the target gear stage, the counter shaft brake 6 is operated to decrease the rotation speed of the dog gear (= the rotation speed of the counter shaft 2). On the contrary, when the rotation speed of the dog gear is lower than the rotation speed of the sleeve, the rotation speed of the dog gear is increased by connecting the clutch and increasing the engine rotation speed. Gearing becomes possible by synchronizing the rotation of the sleeve and dog gear. As described above, the electronic synchronous transmission 21 does not require a synchronization mechanism constituted by a machine.

  The countershaft brake 6 is constituted by a so-called wet multi-plate brake (CSB) 5. That is, the countershaft brake 6 has a disk plate that is coaxially attached to the countershaft 2 in opposition to a disk plate that is fixed to the transmission housing 4. In order to perform braking of the countershaft 2 in the synchronous control, the synchronization electromagnetic valve 24 is driven by a synchronization braking command, and a piston (not shown) is pressed by the air pressure from the air source 25 to bring the disk plates into pressure contact with each other. The brake 6 is operated. When there is no braking command at the time of synchronization, the driving of the synchronizing electromagnetic valve 24 is turned off, and the air pressure of the countershaft brake 6 is released from the synchronizing electromagnetic valve 24 to the atmosphere by the pressing of a return spring (not shown). As a result, the countershaft brake 6 is deactivated.

  Incidentally, as shown in FIG. 3, the transmission housing 4 of the electronic synchronous transmission 21 includes a part of each of the plurality of counter gears 3 attached to the counter shaft 2, in the illustrated example, in the vicinity of the lower surface of the counter shaft 2. Is stored in the lubricating oil L, and the lubricating oil L is circulated as the counter gear 3 rotates.

  However, when the counter gear 3 agitates the lubricating oil L, energy loss called agitation loss occurs. The stirring loss is a loss that cannot be ignored and should be reduced. In particular, when the temperature of the lubricating oil L is low, a large stirring loss occurs because the viscosity of the lubricating oil L is high. Further, when the lubricating oil L is circulated by the oil pump 26, the pump driving force required for pumping the lubricating oil L increases when the temperature of the lubricating oil L is low. The phenomenon that the temperature of the lubricating oil L is low becomes prominent immediately after starting the engine or when the outside air temperature is low.

  Therefore, in order to reduce stirring loss and pump driving force, when the temperature of the lubricating oil L is low, it is necessary to raise the temperature of the lubricating oil L to a predetermined temperature at an early stage. As an electronic synchronous transmission for raising the temperature of the lubricating oil L, an electric heater 42 is installed in the transmission housing 4 as in the electronic synchronous transmission 41 shown in FIG. As in the electronic synchronous transmission 51 shown in FIG. 5, the heat exchanger 52 is installed, the exhaust gas is guided to the heat exchanger 52, and the temperature of the lubricating oil L is increased by the heat of the exhaust gas. Things are known. By increasing the temperature of the lubricating oil L and maintaining the viscosity of the lubricating oil L low, the stirring loss and the driving force of the oil pump 26 can be reduced, and the loss of the entire transmission can be reduced.

  Note that if the stirring loss is merely reduced, the oil level of the lubricating oil L in the transmission housing 4 may be lowered. However, when the oil level is lowered, the lubrication performance decreases. Therefore, it is desirable to reduce the stirring loss without lowering the oil level.

JP 2000-234669 A JP 2007-127237 A

  When the temperature of the lubricating oil L is increased by the electric heater 42, a large amount of electric power is consumed, so that it is necessary to enhance the electrical system including the alternator, and the fuel consumption deteriorates due to the electric power consumption.

  When the temperature of the lubricating oil L is raised by the heat of the exhaust gas, although the fuel efficiency is not deteriorated, the heat exchanger 52 is installed, so the apparatus configuration becomes large, many parts are added, the transmission and the exhaust system Accompanied by significant design changes.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an electronic synchronous transmission that solves the above-described problems, can reduce the fuel consumption, and can increase the temperature of the lubricating oil with fewer parts added.

  In order to achieve the above object, the present invention provides a countershaft that is mounted on a vehicle and to which power from an engine is transmitted via a clutch, and a part of a counter gear attached to the countershaft is immersed in lubricating oil. Counter comprising: a transmission housing in which the lubricating oil is stored; and a wet multi-plate brake having a disk plate mounted coaxially to the counter shaft so as to oppose a disk plate fixed to the transmission housing Lubricating oil temperature for detecting the temperature of the lubricating oil in an electronic synchronous transmission comprising a shaft brake and shift control means for controlling the countershaft by operating the countershaft brake when the gear is engaged during a shift period A sensor, vehicle driving state detecting means for detecting a driving state of the vehicle, and whether the shift control means is in a shift period; A shift period detecting means for detecting whether or not the vehicle is in a decelerating state and the shift control means is not in a shift period when the temperature of the lubricating oil is not more than a set value; Lubricating oil temperature rise control means for operating the shaft brake to raise the temperature of the lubricating oil is provided.

  The vehicle driving state detecting means may determine that the driving state of the vehicle is a deceleration state when it is detected by the accelerator sensor that the accelerator is off.

  The lubricating oil temperature raising control means may operate the countershaft brake so that a braking force is transmitted through the lubricating oil while the disk plates are not in contact with each other.

  The present invention exhibits the following excellent effects.

  (1) Does not deteriorate fuel consumption.

  (2) There are few additional parts.

  (3) The temperature of the lubricating oil can be raised.

It is a block diagram of the electronic synchronous transmission which shows one Embodiment of this invention. It is a block diagram of the conventional electronic synchronous transmission. It is a block diagram of the conventional electronic synchronous transmission which does not heat up lubricating oil. It is a block diagram of the electronic synchronous transmission which heats up the conventional lubricating oil. It is a block diagram of the electronic synchronous transmission which heats up the conventional lubricating oil.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 1, an electronic synchronous transmission 1 according to the present invention is mounted on a vehicle, and a countershaft 2 to which power from an engine (not shown) is transmitted via a clutch (not shown) is attached to the countershaft 2. The countershaft 2 is opposed to the transmission housing 4 in which the lubricating oil L is stored so that a part of the counter gear 3 is immersed in the lubricating oil L, and the disk plate fixed to the transmission housing 4. A countershaft brake 6 comprising a wet multi-plate brake 5 having a disk plate mounted coaxially, and a shift control means 7 for controlling the countershaft 2 by operating the countershaft brake 6 when the gear is engaged during a shift period. An electronic synchronous transmission 1 is provided.

  The electronic synchronous transmission 1 determines whether or not the lubricating oil temperature sensor 8 that detects the temperature of the lubricating oil L, the vehicle driving state detecting unit 9 that detects the driving state of the vehicle, and the shift control unit 7 are in the shifting period. When the shift period detecting means 10 to detect and the temperature of the lubricating oil L is equal to or lower than the set value, the countershaft brake 6 is selected if the driving state of the vehicle is a deceleration state and the shift control means 7 is not in the shift period. And the lubricating oil temperature rise control means 11 for raising the temperature of the lubricating oil L.

  The vehicle equipped with the electronic synchronous transmission 1 includes an accelerator sensor (not shown) that detects the accelerator being turned off (not shown), as well as all known sensors and actuators necessary for engine control and shift control, even if not shown. is there.

  The shift control means 7 controls the transmission actuator (not shown) to shift the current gear stage to the target gear stage to release the gear and put in the gear. The synchronization electromagnetic valve 24 can be driven. The shift control means 7 is conventionally incorporated in an electronic control unit (ECU) 12 as a program. The vehicle drive state detection means 9, the shift period detection means 10, and the lubricating oil temperature rise control means 11 are preferably incorporated in the ECU 12 as a program.

  Here, the shift control means 7 outputs a status signal “during a shift period” during the shift period, and the vehicle drive state detection means 9 outputs a status signal “deceleration state” when the vehicle is in a deceleration state, The lubricating oil temperature rise control means 11 outputs a status signal “low oil temperature” when the temperature of the lubricating oil L detected by the lubricating oil temperature sensor 8 is equal to or lower than a set value. The lubricating oil temperature rise control equivalent circuit 13 shows the function of the lubricating oil temperature rise control means 11 with a logic circuit. The lubricating oil temperature rise control equivalent circuit 13 outputs a temperature rise braking command and outputs a temperature rise electromagnetic valve 14 when it is “low oil temperature”, “deceleration state”, and not “during a shift period”. Can be driven.

  In the temperature raising solenoid valve 14, the E port is opened to the atmosphere, and the P2 port is directly connected to the air source 25, or is connected to the air source 25 via the decompression unit 15 as indicated by a broken line. The output port of the temperature raising solenoid valve 14 is connected to the E port of the synchronization solenoid valve 24.

  Next, the operation of the electronic synchronous transmission 1 will be described.

  In the present invention, the lubricating oil in which the disk plate of the countershaft brake 6 is immersed by operating the countershaft brake 6 when the temperature of the lubricating oil L is low, such as immediately after starting the engine or when the outside air temperature is low. L is raised in temperature.

  However, when the vehicle is accelerating, or when the vehicle is traveling at a constant speed, operating the countershaft brake 6 undesirably decelerates the vehicle. On the other hand, it is convenient to operate the countershaft brake 6 when the vehicle is decelerating. Therefore, in the present invention, the vehicle driving state detecting means 9 detects that the vehicle is in a decelerating state. Preferably, the vehicle driving state detection means 9 determines that the driving state of the vehicle is a deceleration state when the accelerator sensor detects that the accelerator is off.

  The countershaft brake 6 is originally used for synchronous control during the shift period. Therefore, in the present invention, the shift period detecting means 10 detects whether or not the shift control means 7 is in the shift period, and the temperature of the lubricating oil L is increased by the countershaft brake 6 only when the shift period is not in effect.

  That is, when the temperature of the lubricating oil L detected by the lubricating oil temperature sensor 8 is equal to or lower than the set value, the lubricating oil temperature increase control means 11 indicates that the vehicle driving state detected by the vehicle driving state detecting means 9 is in the deceleration state. If the gear change control means 7 is not in the gear change period, a temperature increase braking command is output to drive the temperature increase electromagnetic valve 14. When the temperature raising solenoid valve 14 is driven, the air pressure of the air source 25 is applied to the countershaft brake 6 via the synchronization solenoid valve 24. As a result, the countershaft brake 6 is operated and the temperature of the lubricating oil L is increased.

  As described above, according to the electronic synchronous transmission 1 of the present invention, the temperature of the lubricating oil L is increased by heat generated when the countershaft brake 6 is operated. Since the calorific value of the countershaft brake 6 is large, the temperature of the lubricating oil L can be quickly raised.

  According to the electronic synchronous transmission 1 of the present invention, the structure of the transmission is not changed at all with respect to the conventional electronic synchronous transmission 21, and the additional parts are substantially composed only of the temperature raising solenoid valve 14. Because there is, it is kept to a minimum.

  According to the electronic synchronous transmission 1 of the present invention, since the countershaft brake 6 is operated when the vehicle is decelerated, the kinetic energy of the vehicle is used as an energy source for increasing the temperature of the lubricating oil. What is consumed for raising the temperature of the lubricating oil is about the electric power for driving the temperature raising solenoid valve 14, and does not deteriorate the fuel consumption.

  According to the electronic synchronous transmission 1 of the present invention, more preferably, the countershaft brake 6 is operated only when the accelerator is off in the deceleration state of the vehicle, that is, only when the driver is aware of the engine brake. By doing so, you will not feel uncomfortable driving.

  Next, another embodiment of the present invention will be described.

  Here, as indicated by a broken line in FIG. 1, the P2 port of the temperature raising solenoid valve 14 is connected to the air source 25 via the pressure reducing unit 15. As a result, when the lubricating oil temperature raising control means 11 drives the temperature raising electromagnetic valve 14, the air pressure of the air source 25 is reduced and applied to the countershaft brake 6.

The air pressure P2 applied to the P2 port of the temperature raising solenoid valve 14 includes the piston area A [m ² ] of the countershaft brake 6, the spring constant k [N / m] of the return spring, and the piston movable range l [m]. Is set within the range of the formula (1) using

  With this setting, the air pressure P2 that is lower than the air pressure of the air source 25 is applied to the countershaft brake 6, so that the countershaft brake 6 is operated in a range where the disk plates in the countershaft brake 6 do not contact each other. In this case, a braking force is transmitted between the disk plates via the lubricating oil L. As a result, energy loss occurs due to the shearing of the lubricating oil L. In this case, since the disk plates do not directly contact each other, the durability of the disk plates does not deteriorate compared to the case where the disk plates contact each other. On the other hand, when the synchronization electromagnetic valve 24 is driven during the shift period, the air pressure P1 of the air source 25 is applied to the countershaft brake 6, so that there is no adverse effect on the braking during the original synchronization control.

DESCRIPTION OF SYMBOLS 1 Electronic synchronous transmission 2 Counter shaft 3 Counter gear 4 Transmission housing | casing 5 Wet multi-plate brake 6 Counter shaft brake 7 Shift control means 8 Lubricating oil temperature sensor 9 Vehicle drive state detection means 10 Shift period detection means 11 Lubricating oil temperature rising Control means 12 ECU
13 Lubricating oil temperature rise control equivalent circuit 14 Temperature raising solenoid valve 15 Pressure reducing unit

Claims (3)

A countershaft mounted on a vehicle and transmitting power from an engine via a clutch;
A transmission housing in which the lubricating oil is stored such that a part of the counter gear attached to the counter shaft is immersed in the lubricating oil;
A countershaft brake consisting of a wet multi-plate brake having a disc plate coaxially attached to the countershaft against a disc plate fixed to the transmission housing;
In an electronic synchronous transmission comprising a shift control means for controlling the countershaft by operating the countershaft brake when the gear is engaged during a shift period,
A lubricating oil temperature sensor for detecting the temperature of the lubricating oil;
Vehicle driving state detecting means for detecting the driving state of the vehicle;
Shift period detecting means for detecting whether the shift control means is in a shift period; and
When the temperature of the lubricating oil is equal to or lower than a set value, if the driving state of the vehicle is a decelerating state and the shift control means is not in a shift period, the countershaft brake is operated to An electronic synchronous transmission comprising a lubricating oil temperature rise control means for raising the temperature.   2. The electronic synchronous shift according to claim 1, wherein the vehicle driving state detecting means determines that the driving state of the vehicle is a deceleration state when it is detected by an accelerator sensor that the accelerator is off. Machine.   3. The electronic device according to claim 1, wherein the lubricating oil temperature raising control unit operates the counter shaft brake so that the braking force is transmitted through the lubricating oil without contact between the disk plates. Synchronous transmission.

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