JPH0547889Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a gear shift operation device for a transmission used in a vehicle.

[Prior Art] As is well known, with the automation of driving, various transmissions have been proposed that detect vehicle driving conditions and automatically shift gears (for example, Utility Model Application No. 59-94068 filed by the present applicant). No., Utility Application No. 163039 (1981)). In this technique, for example, as shown in FIG. 2, a shift fork shaft 2 that operates a striker 3 to change gears can be moved from side to side in the drawing by a shift actuator 4.
Compressed air from the air tank 5 is used as this working fluid, and as described later, when the solenoid valve 6a is turned on, the compressed air flows into the chamber A of the shift actuator 4 and moves the ring piston 7a to the right in the drawing. Therefore, the shift fork shaft 2 moves to the right, and when the solenoid valve 6b is turned on, compressed air enters the chamber B, moves the ring piston 7b to the left, and the shift fork shaft 2 moves to the left.
A control device 4c that outputs signals to each of the electromagnetic valves 6a and 6b receives signals from a means for detecting vehicle operating conditions, such as load, accelerator opening, vehicle speed, engine speed, etc., and determines the electromagnetic valve. valve 6a,
6b can be opened and closed. Also, the shift position of the shift fork shaft 2, that is, the neutral position N, and the positions
Position Y of speed, 3rd speed, and 6th speed is X position switch 1
It is detected by the X and Y position switch 1Y and the neutral position switch 1N, and is inputted as information to the control device 8.

Such a device works well per se and is suitable for motor vehicle motion automation. In addition, especially large vehicles are usually equipped with a compressor and a water tank, making it easy to implement.

However, if such a device is implemented, if a failure occurs in the signal system from the control device or any of the solenoid valves, the solenoid valve will remain in the closed position and the compressed air in the air tank will run out. or if there is a malfunction in the air system,
The shift fork shaft becomes inoperable, making it impossible to shift gears.

Other conventional techniques include, for example, JP-A-53-
Publication No. 34071 describes a pressure accumulation type accumulator,
A hydraulic system is shown that includes a hydraulic circuit provided with a solenoid valve for actuating the accumulator. However, this conventional technology provides a solenoid valve to connect the hydraulic circuit and the accumulator.
This assumes the existence of a hydraulic circuit and an accumulator. Therefore, it is virtually impossible to apply this method to a speed change operation device that operates a shift actuator using high-pressure gas.

Furthermore, even if it is assumed that two solenoid valves are provided separately in a speed change operation device that includes a high-pressure air circuit,
If one solenoid valve fails to supply air due to a failure, even if air is supplied from the remaining solenoid valve from a separate air source, high-pressure air will flow out from the exhaust port of the failed solenoid valve. , there is a problem that the piston does not work.

[Purpose of the invention] The present invention was proposed in view of the problems of the prior art described above, and it is an object of the present invention to provide a gear shift operation device for a transmission that can shift gears even if a failure occurs in a signal system, solenoid valve, or air system. It is an object.

[Configuration of the invention] According to the invention, the shift fork shaft 2 is actuated via the first and second solenoid valves 6a and 6b independent from the high-pressure gas supply source 5 to shift the transmission to the neutral position, the shift position, and the like. Two free pistons 7a and 7b are arranged in the cylinder and are equipped with a shift actuator 4 that is operated to the opposite shift position, and are slidably attached to the outer periphery of the piston on both sides of the piston fixed to the shift fork shaft 2. , in a speed change operating device that includes two cylinder chambers on the axially outer side of a piston and sends gas to each cylinder to operate a shift actuator 4, the first and second solenoid valves 6a and 6b each have a When it is on, it is connected to the high pressure gas supply source 5, and when it is off, it returns with a spring, and the exhaust side of each valve is connected to the third and fourth solenoid valves 11a and 11b, respectively. solenoid valve 11
Exhaust ports a and 11b are exhaust ports 10a and 10 of first and second solenoid valves 6a and 6b, respectively.
b, and the first or second solenoid valve 6
If a or 6b fails, the third or fourth
The third or fourth solenoid valve 11a is turned on from another air tank 12 by turning on the solenoid valves 11a and 11b.
Alternatively, lines La and Lb are provided which are connected to the exhaust port 10a or 10b of the failed electromagnetic valve 6a or 6b via 11b.

In implementing the present invention, the shift fork actuator may be of any structure, provided that it is actuated by supplying high pressure gas via a solenoid valve, and any suitable source of high pressure gas may be used, such as an air tank, an air compressor, or an inert gas cylinder.

[Function] According to the speed change operation device of the present invention having the above-described configuration, in the event that a failure occurs in the signal system, solenoid valve, or air system, the solenoid valve is in the on position, that is, in the conductive state. In virtually no cases, the solenoid valve is usually located on the exhaust port side. This is because the solenoid valve is in the off position when no signal is input, and turns on only when gear shifting is performed, and the time it is on is extremely short, so it can be safely assumed that it is normally in the off position. It is. Therefore, in the event of a failure, by opening another solenoid valve, another source of high pressure gas can be supplied to the shift fork actuator and the shift shaft rod can be moved.

Therefore, even if a gear malfunctions while the gear is engaged, it can be returned to the neutral position in order to remove the gear, and for example, in order to input into a gear that is not malfunctioning, it is possible to return to the neutral position and then This is effective when driving an engine.

In particular, since the exhaust port of the solenoid valve is normally left open, it is extremely easy to connect another solenoid valve, and it can be easily added to the conventional technology.

As described above, according to the present invention, reliability can be improved simply by installing another high-pressure gas supply source and another electromagnetic valve.

In addition, according to the present invention, by providing another solenoid valve using the exhaust port, if one of the solenoid valves malfunctions and cannot supply high-pressure air, the malfunctioning solenoid valve will be replaced. Since high-pressure gas air is supplied from the exhaust port, the actuator can be operated without high-pressure air flowing out from a malfunctioning solenoid valve. Therefore, even if high-pressure air is supplied from the remaining solenoid valves, the problem in the prior art in which high-pressure air flows out from the exhaust port of the failed solenoid valve and the piston does not operate is also solved.

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1, and the same parts as in FIG. 2 will be given the same reference numerals and repeated explanation will be omitted. Note that the control device is omitted in FIG.

In FIG. 1, lines La and Lb are connected to exhaust ports 10a and 10b of solenoid valves 6a and 6b, respectively, and another air tank 12 is connected to these lines La and Lb via separate solenoid valves 11a and 11b, respectively. It is connected.

Therefore, if any of the solenoid valves becomes inoperable in the illustrated state, the driver can, for example, actuate a fault switch (not shown) provided on the instrument panel to make another solenoid valve conductive. (For example, if the solenoid valve 6a fails, another solenoid valve 11a
When activated), compressed air from a separate air tank can move the shift fork shaft 2, which is sent to the shift fork actuator 4.

[Effects of the invention] As described above, according to the invention, it is only necessary to connect another high-pressure gas supply source to the exhaust port of the conventional solenoid valve via another solenoid valve, and a simple and highly reliable speed change operation device can be achieved. can be obtained.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a transmission operating device according to the present invention, and FIG. 2 is an explanatory diagram showing a conventional transmission operating device. 2...Shift fork shaft, 4...Shift fork actuator, 6a, 6b...Solenoid valve, 11a, 11b...Another solenoid valve, 12...Another air tank.

Claims (1)

[Scope of utility model registration request] first and second independent from the high pressure gas supply source 5;
The shift actuator 4 operates the shift fork shaft 2 through the solenoid valves 6a and 6b of the shift fork shaft 2 to operate the transmission to a neutral position, a shift position, and an opposite shift position. Two free pistons 7a, 7 are swingably attached to the outer circumference on both sides of the piston.
b is disposed in a cylinder and has two cylinder chambers on the axially outer side of the piston, and the shift actuator 4 sends gas to each cylinder to actuate the shift actuator 4. The solenoid valves 6a and 6b are respectively connected to the high pressure gas supply source 5 when they are on, and are returned by springs when they are off, and the exhaust sides of the respective valves are connected to the third and fourth solenoid valves 11a and 11b, respectively. , normally the exhaust ports of the third and fourth solenoid valves 11a, 11b are connected to the first and second solenoid valves 6, respectively.
a, 6b, and when the first or second solenoid valve 6a or 6b fails, the third or fourth solenoid valve 1
1a, 11b to turn on the third or fourth solenoid valve 11a or 11 from another air tank 12.
A speed change operation device for a transmission, characterized in that lines La and Lb are provided which are connected to the exhaust port 10a or 10b of the failed electromagnetic valve 6a or 6b via the line La and Lb.