JPH0671959U - Vehicle transmission - Google Patents

Abstract

(57) [Abstract] [Purpose] Select shift actuators that perform gear shift operations of multi-stage gear type transmissions with fluid pressure and solenoid valves for select shift that drive these actuators based on electrical signals from shifters in the cab. In a vehicle transmission equipped with a control unit that is controlled via a manual control valve and a directional control valve (differential pressure responsive type) that constitutes an emergency circuit, allows manual shifting to the same number of gears as in normal operation. Constitute. [Structure] Manual switching valves 25-2 for gear-shifting the transmission 4 to a gear position required for normal traveling
7 and the differential pressure responsive directional switching valves a to h for selectively connecting the discharge ports of the select shift solenoid valves A to H to the manual switching valve side and the atmosphere opening side, and the operating positions of the manual switching valves. Accordingly, a differential pressure responsive logic circuit 29 for supplying fluid pressure to the same select shift solenoid valves A to H that are turned on by an electric signal from the shifter, and an emergency supply circuit for fluid pressure to the manual switching valve are provided. A manual switching valve 28 for opening and closing is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a vehicle transmission.

[0002]

[Prior art]

 Select shift actuators that perform gear shift operations of multi-stage gear type transmissions with fluid pressure, and control units that control these actuators in response to electrical signals from the shifter via solenoid valves for select shifts. In the transmission, an emergency solenoid valve connected to the exhaust port of the select shift solenoid valve is installed to prevent the vehicle from falling into an inoperable state due to a control unit failure, etc. There is one that controls the fluid pressure from the discharge port of the select shift solenoid valve to the select shift actuator via an emergency solenoid valve that operates according to the operation (Japanese Utility Model Laid-Open No. 2-21366). In addition, a solenoid valve is not used for emergency so that not only the failure of the control system but also the failure of the electric system can be dealt with.A manual switching valve for controlling the fluid pressure to the select shift actuator is provided. Have been proposed (Japanese Patent Laid-Open Nos. 63-253553 and 63-243554).

[0003]

[Problems to be solved by the device]

 However, in any of the conventional examples as described above, only the gear shift operation to the first forward speed and the reverse gear can be performed in an emergency, so that this has only the function of evacuating the vehicle, which is an emergency. There was a problem that normal driving was very difficult.

An object of the present invention is to provide a device capable of manual shifting to the same number of shift stages as in a normal state by configuring an emergency circuit with a manual switching valve and a directional switching valve (differential pressure responsive type). To do.

[0005]

[Means for Solving the Problems] Therefore, actuators for select shift that perform gear shift operation of a multi-stage gear type transmission by fluid pressure, and drive of these actuators for select shift based on an electric signal from a shifter in a cab In a transmission of a vehicle equipped with a control unit that controls via the solenoid valve, a manual switching valve for gearshifting the transmission to the number of gears required for normal running, and a discharge port for each selectshift solenoid valve. The differential pressure responsive directional switching valve that selectively connects the switch to the manual switching valve side and to the atmosphere open side, and the same select shift solenoid that is turned on by the electric signal of the shifter according to the operating position of the manual switching valve. To open and close the differential pressure responsive logic circuit that supplies fluid pressure to the valve and the emergency supply circuit that supplies fluid pressure to the manual switching valve. Providing a manual switching valve.

[0006]

[Action]

 According to this, when the manual switching valve of the emergency supply circuit is opened when the electrical system fails, the fluid pressure is supplied to the manual switching valve for gear shift operation. Gear shifting is possible. The fluid pressure passes through the logic circuit according to the operation position of the manual switching valve, and is supplied to the select shift actuator from the same discharge port of the selector shift solenoid valve that is turned on by the electric signal of the shifter. Therefore, the fluid pressure to the select shift actuator is switched to the supply state corresponding to the number of gears required for normal traveling by the manual switching valve, so that the transmission can be set to the neutral position and the gear set to the requested shift stage safely. be able to.

[0007]

【Example】

 FIG. 1 is an overall configuration diagram showing an application example to a diesel engine vehicle. In a mechanical clutch 1, a clutch actuator 3 (air booster) that performs an on / off operation of a clutch according to a depression angle of a clutch pedal 2 is a multistage gear. In addition to the gear shift actuator 5 that drives the gear shift mechanism, the transmission 4 is provided with a range actuator 7 that shifts each range gear behind the main gear.

As means for detecting the operating state necessary for gear shift control of the transmission 4, the clutch 1 is provided with an engine rotation sensor 8 for detecting the rotational speed of the engine from the flywheel, and the clutch pedal 2 is provided with the initial and operating positions of the pedal. The pedal SWs 9a and 9b for detecting the shift are included in the transmission 4, a shift position sensor 10 for detecting the actual shift position, and a main shaft rotation sensor 11 (as a vehicle speed sensor) for detecting the rotation speed of the main shaft connected to the propeller shaft. Functioning) is installed.

On the main side and the sub side of the transmission 4, a main gear that idles on the main shaft meshes with the main shaft in the synchronizing region, so that the counter shaft rotation that detects the rotational speed of the counter shaft that constantly meshes with the main gear is detected. Sensors 12a and 12b are provided. In the cab, in addition to an accelerator pedal (not shown) that drives the fuel injection pump 13 of the engine, a shift lever device 15 (shifter) that commands a gear shift of the transmission 4, and a monitor 16 that displays the shift position of the transmission 4 Is provided. The operation pattern of the shifter 15 is simplified into an h-type (having 5 positions of shift up, shift down, hold, reverse, and neutral).

The control unit 17 controls the drive of the actuator based on these detection signals. Based on a shift request corresponding to the lever position of the shifter 15, the transmission unit is set to the neutral position and the required stage is set. Perform a gear set operation. The control unit 17 is designed so that the power supply circuit is shut off when an abnormality described later occurs.

By the way, as the gear shift actuator 10 and the range actuator 7, as shown in FIG. 2, air cylinders 20 to 22 and electromagnetic valves A to H for controlling the air pressure to these cylinders 20 to 22 are adopted. . In this case, the solenoid valves A to H are controlled to be turned on and off according to the shift request of the control unit 17 as shown in FIG. 3. For example, the solenoid valves for shift are responded to the request to set the neutral position. Since A and C are on and supply air pressure, the shift cylinder 20 shifts to the neutral position, and when a request for setting the first gear is generated thereafter, the electromagnetic valves A, D, F and G are on. In order to supply the air pressure, the select shift operation of the select cylinder 21 and the shift cylinder 20 to the first to third gears and the shift operation of the range cylinder 22 to the low gear are executed. Reference numeral 23 is a tank as a supply source of air pressure, and 24 is a reversing lever for engaging the select cylinder 21 with the gear shift mechanism.

The air circuit to these cylinders 20 to 22 is provided with a position corresponding to all forward gears of the transmission 4 in order to enable a manual speed change that copes with a failure of the electric system. ), A manual switching valve 26 (opening / closing valve) for setting the transmission 4 to the neutral position, a manual switching valve 27 (opening / closing valve) for performing a gear shift operation to the reverse gear, and each solenoid valve A to. Differential pressure responsive directional switching valves a to h (double check valves) are provided to selectively connect the H discharge port to the manual switching valves 25 to 27 side and the atmosphere open side. In addition, a differential pressure responsive logic circuit 29 that supplies air pressure to the same solenoid valves A to H that are turned on by a shift request of the control unit 17 according to the operation position of the manual switching valve 25 is a double check valve. A manual switching valve 28 (opening / closing valve) configured to open and close the emergency supply circuit for air pressure to the manual switching valves 25 to 27 side is provided. Incidentally, the operation parts of the manual switching valves 25 to 28 are collectively attached to positions where the driver can easily operate, like the shifter 15.

With such a configuration, when the manual switching valve 28 of the emergency supply circuit is opened when the electric system fails, air pressure is supplied to the manual switching valves 25 to 27 for gear shift operation, so that these manual switching valves are operated. Manual shifting is possible by operating the valves 25 to 27. The air pressure passes through the logic circuit 29 according to the operation position of the manual switching valves 25 to 27, and from the discharge port of the same solenoid valve A to H that is turned on by the lever operation of the shifter 15 to each cylinder 20 to 22. Supplied. Therefore, the manual switching valves 25 to 27 switch the air pressure to the cylinders 20 to 22 to the supply state corresponding to the number of gear stages in the normal state, so that the transmission 4 is set to the neutral position and the gear set is set to the required stage. Can be done safely.

In this case, the manual switching valve 25 can perform the gear shift operation of the transmission 4 at all forward speeds, but by assembling the differential pressure responsive logic circuit 29 with the double check valves i to q. Effectively avoiding complication of the configuration such as the number of ports. The number of positions of the manual switching valve 25 is not necessarily all forward gears, and may be simplified to the minimum number of shift gears required for normal traveling.

[0015]

[Effect of device]

 In short, according to the present invention, an actuator for select shift that performs a gear shift operation of a multi-stage gear type transmission by fluid pressure and an electromagnetic valve for select shift that drives these actuators based on an electric signal from a shifter in a cab. In a transmission of a vehicle equipped with a control unit that is controlled via a manual switching valve for operating the transmission to shift gears to the number of shift steps required for normal running, and the exhaust port of each select shift solenoid valve to the manual switching valve side. And differential pressure responsive directional switching valve that is selectively connected to the atmosphere open side, and to the same select shift solenoid valve that is turned on by an electric signal from the shifter according to the operating position of the manual switching valve. To open and close the differential pressure responsive logic circuit that supplies the Is provided with the switching valve, Tomedo Marazu about retraction of the vehicle, the effect of normal driving also in general path obtained by shifting the manual selector valve, such as during failure of the electrical system.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a transmission.

FIG. 2 is a circuit configuration diagram of a gear shift actuator or the like.

FIG. 3 is an explanatory diagram of an operating state corresponding to a shift request of each solenoid valve.

[Explanation of symbols]

 4 Tonance transmission 5 Gear shift actuator 8 Engine rotation sensor 10 Shift position sensor 11 Main shaft rotation sensor 12a, 12b Counter shaft rotation sensor 15 Shifter 17 Control unit 20 Shift cylinder 21 Select cylinder 25-28 Manual switching valve 29 Logic circuit A to H Solenoid valve aq Double check valve

Claims (1)

[Scope of utility model registration request] 1. A select shift actuator for performing a gear shift operation of a multi-stage gear type transmission by fluid pressure, and driving of these actuators is controlled through a select shift solenoid valve based on an electric signal from a shifter in a cab. In a vehicle transmission equipped with a control unit, select a manual switching valve for gearshifting the transmission to the number of gears required for normal running, and select the exhaust port of each select shift solenoid valve between the manual switching valve side and the atmosphere open side. Pressure differential type directional switching valve that is connected electrically and differential pressure responsive type that supplies fluid pressure to the same select shift solenoid valve that is turned on by an electric signal from the shifter according to the operating position of the manual switching valve It has a logic circuit and a manual switching valve for opening and closing the emergency supply circuit of fluid pressure to the manual switching valve. And the vehicle transmission.