JPH04290677A - Control for shift operation device - Google Patents

Abstract

PURPOSE:To provide the control method for a shift operation device for carrying out the damper action without installing the parts which are used exclusively for damper. CONSTITUTION:In the exhaust operation for the pressure chambers 6 and 7 by using selector valves A' and B' in a subcontrol system which are used in emergency, exhaust from the selector valves A' and B' is once suspended, and the damper action is carried out.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of controlling a shift operating device, and more particularly, to a method of controlling a shift operating device that utilizes a sub-control system used in an emergency as a damper.

0002

[Prior Art] Buses, trucks, etc. that have large transmissions require a large amount of force to operate the transmission, so compressed air is used and the compressed air is pumped into two pressure chambers defined by pistons. A transmission operating device is installed that operates a power piston by supplying and discharging the power, and operates a shift lever via a piston rod. Incidentally, a synchronous gear is usually used as a gear in a transmission, but in this synchronous gear, the load of a shift operation reaches its maximum immediately before synchronization is completed, and the load rapidly decreases after synchronization is completed.

Therefore, when the above-mentioned transmission operating device is adopted, the power piston suddenly accelerates immediately after gear synchronization is completed, and as a result, an impact is applied to the dog teeth of the transmission gear, gear shift fork, etc., causing mechanical damage to them. This can cause damage, which can significantly reduce the durability of the device.

[0004] Therefore, in such a transmission operating device,
A damper means is provided to reduce the impact at the end of the shift operation.

[0005] As such a damper means, there is one in which a mechanical damper device is incorporated into the operating device to perform a damping action (Japanese Patent Application Laid-open No. 312547/1983). However, such a damper device has an increased number of parts, and the operating device becomes complicated.

[0006] On the other hand, the damper effect is achieved by controlling the exhaust by using a switching valve that supplies and discharges compressed air to the pressure chamber of the operating device, without attaching such a mechanical damper device. A method (Utility Model Application Publication No. 63-104230) is also provided.

However, when such a damper means is employed, the number of times the switching valve is operated increases, so the durability of the switching valve must be increased.

[0008] Such a problem can be solved by adding a dedicated exhaust valve, but this increases the cost accordingly.

[0009] Therefore, an object of the present invention is to utilize a sub-control system installed for emergency use and to perform a damper action by controlling the switching valve of the control system, thereby increasing the number of parts. It is an object of the present invention to provide a control method that realizes a more advantageous shift operation device without causing any problems.

0010

[Means for Solving the Problems] A control method for a shift operation device according to the present invention has two pressure chambers, maintains a neutral state by supplying compressed fluid to both pressure chambers, and supplies compressed fluid to both pressure chambers to maintain a neutral state. A shift operating device body that performs a shift operation by discharging compressed fluid, a main control system having two main switching valves connected to both pressure chambers, and two sub-switching valves each having an exhaust port to the atmosphere. A sub-control system having a valve, and a pressure source switching valve that communicates a pressure source of compressed fluid with either the main control system or the sub-control system, and the pressure source switching valve is in an inoperable state. A pressure source is communicated with each of the above main switching valves, the pressure source is communicated with each of the above sub switching valves in an activated state, and each of the main switching valves is in an inactive state and each of the pressure chambers is communicated with each of the above sub switching valves. The switching valves for the pressure source communicate with each of the pressure chambers in an activated state, and the sub-switching valves communicate their exhaust ports with each of the main switching valves in an inactive state, and communicate with the pressure source in an activated state. and a control unit that communicates the switching valves with the main switching valves, and in normal operation, the one main switching valve supplies compressed fluid to the one pressure chamber, and the compressed fluid in the other pressure chamber. is discharged to the atmosphere through the other main switching valve and further through one of the sub-switching valves, and in an emergency operation, through the other sub-switching valve and then the one main switching valve. The compressed fluid is supplied to one of the pressure chambers, and the compressed fluid in the other pressure chamber is discharged to the atmosphere through the other main switching valve and the one sub-switching valve. At the end of the shift operation, one of the sub-switching valves is operated to temporarily stop the exhaust from the other pressure chamber, thereby performing a damper action.

[0011]

[Operation] In the method for controlling a shift operation device of the present invention,
A sub-switching valve for emergency operation, which is not required during normal operation, is used to provide a damper effect. In an emergency, that is, when the main switching valve stops operating, the sub control system is used to perform a shift operation. In this case, the damper action cannot be performed, but since the emergency operation is temporary, there is almost no problem.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a shift operating device for carrying out the method according to the invention.

A main body 1 of this shift operating device has a piston rod 3 within a housing 2. The piston rod 3 has a power piston 4 which is housed in a cylinder 5 formed in the housing 2 . The cylinder 5 has two pressure chambers 6,
7. The pressure chambers 6 and 7 have ports 8 and 9.

The piston rod 3 also has a shift lever 10. This shift lever 10 is engaged with a shift rod 11, and a shift fork 12 of the shift rod 11 is engaged with a shift sleeve 13. On both sides of this shift sleeve 13, transmission gears 14 and 15 are arranged.

When compressed air is supplied to the pressure chamber 6, the piston 4 is moved to the right. Therefore, the piston rod 3 is moved to the right together with the shift lever 10. This shift lever 10 operates the shift rod 11 to the right, and via the shift fork 12, operates the sleeve 13 to the right. This sleeve 13 meshes with a transmission gear 14 via a synchronizer ring (not shown) or the like. Note that during the above shift operation, the compressed air in the pressure chamber 7 is discharged from the pressure chamber 7 by the piston 4.

A stroke sensor 16 for detecting the amount of displacement of the piston rod 3 is disposed between the piston rod 3 and the housing 2. The stroke sensor 16 confirms the neutral position and the shift completion position, thereby operating a switching valve to be described later.

The shift operating device main body 1 is controlled by a control section 20 shown in FIG. This control section 20 is
3-port electromagnetic switching valves A and B that constitute the main control system,
It is equipped with 3-port electromagnetic switching valves A' and B' that constitute the sub-control system, and a 3-port electromagnetic switching valve C for supplying compressed air from the air tank D to either the main control system or the sub-control system. .

The first port a of the switching valve C is connected to the air tank D, and the second port b is connected to the switching valve A.
The third port c is connected to the first port a of the switching valve A' and the first port a of the switching valve B'. has been done. Further, the second ports b, b of the switching valves A, B are connected to the pressure chambers 6, 7, respectively, and the third ports c, c are connected to the second ports b, b of the switching valves A', B'. b, respectively. Further, the third ports c and c of the switching valves A' and B' are exhaust ports.

The above-mentioned switching valve C connects the first port a and the second port b when it is in the non-operating (OFF) state, and when it is activated (ON), the first port a communicates with the third port a. port c
communicate with. In addition, switching valves A and B are inactive (OFF).
) state, the second port b and the third port c are in communication with each other, and when activated (ON), the second port b is communicated with the first port a. In addition, when the switching valves A' and B' are in an inoperative (OFF) state, the second port b is connected to the third port c.
When activated (ON), the second port b
is communicated with the first port a.

Therefore, in this control section 20, when the switching valves A, B, C, A', B' are in the non-operating (OFF) state, the pressure chambers 6, 7 are controlled via the switching valves A, B. , and is further opened to the atmosphere via switching valves A' and B'. The compressed air in the air tank D is supplied to the switching valves A and B via the switching valve C;
It is blocked by B.

[0021] Here, when the transmission is to be maintained in a neutral state, the switching valves A and B are operated. Then, the compressed air in the air tank D is supplied to the pressure chambers 6 and 7 via the switching valves A and B, respectively, and thereby,
Piston 4 is held in a neutral position. This neutral position of the piston 4 corresponds to the neutral position of the sleeve 13.

From this state, when the sleeve 13 is to be brought into mesh with the gear 14, for example, the switching valve B is deactivated (OFF).
) state. Then, the compressed air in the pressure chamber 7 is
It is discharged to the atmosphere via switching valves B and B'. Accordingly, the piston 4 is actuated to the right, and a shift operation is performed.

At the end of this shift operation, that is, when gear synchronization is completed, the switching valve B' is activated (ON). Then, exhaustion of the pressure chamber 7 is stopped, and therefore a damper action is performed. Thereafter, the switching valve B' is again deactivated (
OFF) state. The switching valve B' can be operated by detecting when gear synchronization is completed and based on the detection signal, but since it is difficult to directly detect when synchronization is complete, for example, when the shift operation is started, After measuring the time based on the standard and assuming that the gear synchronization is completed after a certain period of time, selector valve B is
It is preferable to manage by time, such as by operating '. In addition, after the shift operation is completed, the switching valve A is also deactivated (OF
F) state, and the compressed air in the pressure chamber 6 is also discharged to the atmosphere.

In order to return to the neutral state from this state, the switching valves A and B are activated (ON) and compressed air is introduced into the pressure chambers 6 and 7. Then, the piston 4 moves to the left, and the sleeve 13 separates from the gear 14 accordingly. Then, the piston 4 reaches the neutral position and is held at the neutral position.

[0025] When the sleeve 13 and the gear 15 are to be brought into mesh with each other, the switching valve A may be set to a non-operating (OFF) state and the compressed air within the pressure chamber 6 may be discharged to the atmosphere. In this case as well, the switching valve A' is once activated (O
N) state to perform damper action.

The shift control under normal conditions has been described above, but in the control section 20, for example, a case may occur (in an emergency) when the switching valve A stops operating. In such a case, switching valve C is activated (ON) and control is performed using switching valves A' and B'.

In such an emergency, to maintain the neutral state, switch valves A' and B' are activated (ON).
Just let it happen. Then, the compressed air in the air tank D is supplied to the switching valves A' and B' via the switching valve C, and then from the switching valves A' and B' to the respective pressure chambers 6 and 7 via the switching valves A and B.
supplied to Therefore, the piston 4 is held in the neutral position.

From this state, when the sleeve 13 is brought into mesh with the gear 14, for example, the switching valve B' is deactivated (OF).
F). Then, the compressed air in the pressure chamber 7 is discharged to the atmosphere via the switching valves B and B'. Accordingly, the piston 4 is actuated to the right, and a shift operation is performed.

In this case as well, the damper action can be performed by once operating (ON) the switching valve B at the end of the shift operation. However, since this is an emergency shift operation, there is no need for the damper to act. That is,
Assuming that the emergency shift operation is not performed for a long period of time, there is no problem in using it without a damper during that time. Note that after the shift is completed, the switching valve A'
The compressed air in the pressure chamber 6 is discharged to the atmosphere by turning it into a non-operating (OFF) state.

In order to return to the neutral state from this state, switch valve A' and switch valve B' are activated (ON).
compressed air is introduced into the pressure chambers 6 and 7. Then, the piston 4 moves to the left, and the sleeve 13 separates from the gear 14 accordingly. Then, the piston 4 reaches the neutral position and is held at the neutral position.

Furthermore, when the sleeve 13 is to be engaged with the gear 15, the switching valve A' is set to the inoperative (OFF) state.
The compressed air in the pressure chamber 6 may be discharged to the atmosphere. In this case, since the switching valve A is out of order, it cannot perform the damping action.

[0032] In the above embodiment, an example was shown in which the present invention was applied to a transmission having a synchromesh mechanism.
The present invention can also be applied to a transmission in which transmission gears are engaged by a dog clutch.

[0033]

As described above, according to the method for controlling a shift operating device according to the present invention, a damper action is performed using a sub-control system for emergency use, which is not normally used.

Therefore, there is no need for a special damper mechanism, and there is no need to overuse the switching valve in the main control system.
Provides sufficient durability.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a longitudinal section of a shift operating device main body and piping of a control section for carrying out a control method according to the present invention.

[Explanation of symbols]

1　Device body 3 Piston rod 4 Power piston 6,7 Pressure chamber 10 Shift lever 11 Shift rod 12 Shift fork 13 Sleeve 14,15　Shift gear 20 Control section A, B, C, A', B' switching valve D Air tank

Claims (1)

[Claims] 1. A shift operation device that has two pressure chambers, maintains a neutral state by supplying compressed fluid to both pressure chambers, and performs a shift operation by discharging compressed fluid from one pressure chamber. A main control system having a main body, two main switching valves each connected to both pressure chambers, a sub-control system having two sub-switching valves having an exhaust port to the atmosphere, and the main control system and sub-control. A pressure source switching valve that communicates a compressed fluid pressure source to either one of the systems, the pressure source switching valve communicating the pressure source to each of the main switching valves in an inactive state,
communicating the pressure source to each of the sub-switching valves in the operating state;
Each of the main switching valves communicates the pressure chambers with the sub switching valves when in an inactive state, communicates the pressure source switching valve with each of the pressure chambers in an operating state, and each of the sub switching valves is inactive. and a control unit that communicates the exhaust ports with each of the main switching valves in the state and communicates the pressure source switching valve with each of the main switching valves in the activated state, and in normal operation, one of the main switching valves is connected to the main switching valve. The valve supplies compressed fluid to one of the pressure chambers, and the compressed fluid in the other pressure chamber is discharged to the atmosphere through the other main switching valve and the one sub-switching valve for emergency operation. Then, compressed fluid is supplied to the one pressure chamber through the other sub-switching valve and the one main switching valve, and the compressed fluid in the other pressure chamber is supplied to the other main switching valve. In addition, at the end of the shift operation in normal operation, one of the sub-switching valves is operated to temporarily remove the exhaust air from the other pressure chamber. A method for controlling a shift operation device, characterized in that a damper action is performed by stopping the shift operation device.