JPH0791536A - Speed change operating device used for mechanical transmission - Google Patents

Abstract

PURPOSE:To enable the power shift by changing quantity of power shift assist in response to the oil temperature, and to avoid the application of excessive load to a synchronizing mechanism. CONSTITUTION:A speed change operating device is formed of plural shift solenoid valves 13, 14 for supplying/discharging the air pressure to/from a shift air cylinder 11, a high air-pressure pipeline 17 and a low air-pressure pipeline 18 for connecting an air pressure source 22 to these shift solenoid valves 13, 14, a high air-pressure supplying solenoid valve 19, which is arranged in the high air-pressure pipeline 17 and which is to be opened at a predetermined transmission-oil temperature or lower and which can supply the high air-pressure from the air-pressure source 22 to the shift air cylinder 11, a reduction valve 20 arranged in the low air-pressure pipeline 18, and a low air-pressure supplying solenoid valve 21, which is arranged in the low air-pressure pipeline 18 downstream of the reduction valve 20 and which is to be opened at a predetermined transmission-oil temperature or higher and which can supply the low air-pressure from the air-pressure source 22 to the shift air cylinder 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear shift operating device used in a mechanical transmission.

[0002]

BACKGROUND ART Recently, in this type of mechanical transmission, an electro-pneumatic control gear shift operation device has been developed and used in a large route bus, and the gear shift operation force is reduced and the operation stroke is reduced to reduce the driver's stroke. Is reducing fatigue. And, this electric-pneumatic control gear shift operation device includes a shift air cylinder and a select air cylinder.
A gear shift and select lever that has a cylinder and whose shift air cylinder is selectively engaged with multiple gear shift forks according to the operation of the gear change lever of the gear change unit. Moves the shift and select shaft that it has in the shift direction, while its select air cylinder moves its gear onto the shift and select shaft.
This is the structure where the shift and select lever is moved in the select direction.

In the electro-pneumatic control gear shift operating device having such a structure, the amount of power assist is always constant regardless of the change in the oil temperature of the transmission, so that the oil temperature becomes high and the oil When the viscous resistance is reduced and gear shifting is possible with a small operating force, the power assist amount becomes too large, causing an excessive load on the synchro mechanism of the transmission. There is a possibility that the durability of the may be impaired.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to change the power shift assist amount according to the oil temperature to enable the power shift, thereby avoiding an excessive load on the synchronizing mechanism, and durability of the synchronizing mechanism. The purpose of the present invention is to provide a speed change operation device used for a mechanical transmission, which is improved in performance.

[0005]

[Means corresponding to the problem and its action]
A shift air cylinder for moving a shift and select shaft in a shift direction, which has a gear shift and select lever selectively engaged with a plurality of gear shift forks, and the shift and
A select air cylinder that moves the gear shift and select lever in the select direction on the select shaft, a plurality of shift solenoid valves that allow air pressure to be supplied to and discharged from the shift air cylinder, and an air pressure source A plurality of select solenoid valves that are connected to and that supply and exhaust air pressure to and from the select air cylinder, and high air pressure piping and low air pressure piping that connect the air pressure source to the shift solenoid valve,
A high air pressure supply solenoid valve that is arranged in the high air pressure pipe and opens the transmission oil temperature below a predetermined value, and that can supply high pressure air from the air pressure source to the shift air cylinder, and the low air pressure pipe. Is placed in the low air pressure piping downstream of the pressure reduction valve, the transmission oil temperature is opened above a predetermined value, and low air pressure is applied from the air pressure source to the shift air cylinder. A low air pressure supply solenoid valve that enables supply is provided, and the power shift assist amount is changed according to the oil temperature of the transmission to enable power shift.

[0006]

DESCRIPTION OF SPECIFIC EXAMPLES Specific specified examples of the shift operating device used in the mechanical transmission of the present invention will be described below with reference to the drawings. FIG. 1 is a specific example 10 of a shift operating device used in a mechanical transmission of the present invention applied to a route bus.
Is shown. The shift operating device 10 shifts the five forward gears and one reverse gear of the synchronous meshing mechanical transmission 50 on the route bus.

The gear shift operating device 10 includes three gear shift shafts (not shown) arranged in a gear shift housing 52 mounted on a gear case 51 of the mechanical transmission 50, and Three
Three gear shift forks (not shown) correspondingly supported on the three gear shift shafts and the gear shift forks associated with the three gear shift shafts.
The shift and select shaft (not shown) arranged in the housing 52 and its three gear shift shafts.
A shift air cylinder 11 having a gear shift and select lever (not shown) selectively engaged with the fork to move the shift and select shaft in the shift direction, and the shift and air cylinder 11
A select air cylinder 12 that moves the gear shift and select lever in the select direction on the select shaft and a shift air cylinder 11 are assembled to supply air pressure to the shift air cylinder 11. First and second shift solenoid valves 1 that can be discharged
3, 14 and the first and second select units which are assembled to the select air cylinder 12 and are connected to the air tank 22 by the pneumatic pipe 23, and which supply and discharge the air pressure to and from the select air cylinder 12. Solenoid valve 15,1
6, a high air pressure pipe 17 and a low air pressure pipe 18 that connect the air tank 22 to the first and second shift solenoid valves 13 and 14, and a high air pressure pipe 17 that is arranged in the high air pressure pipe 17 to keep the transmission oil temperature at a predetermined level. A high air pressure supply solenoid valve 19 that is opened below a value and that enables high pressure air to be supplied from the air tank 22 to the shift air cylinder 11, and a pressure reducing valve 20 arranged in the low air pressure pipe 18. , The low air pressure pipe 18 downstream of the pressure reducing valve 20.
The transmission oil temperature is opened above a certain value, and the shift from the air tank
A low air pressure supply solenoid valve 21 capable of supplying a low air pressure to the air cylinder 11, a gear change unit 23 having a fingertip operation type gear change lever 24, and a gear change operation of the gear change unit 23. The solenoid valves 13, 14, 15 and 16 are provided with a controller 25 that controls the currents respectively flowing through the solenoid valves 19 and 21 according to the transmission oil temperature.

The three gear shift shafts are prepared for switching between forward first speed-reverse speed gear, forward second speed-forward third speed gear, and forward fourth speed-forward fifth speed gear, and
The gear shift forks of the first forward speed-reverse speed, the second forward speed-third forward speed, and the fourth forward speed-5th forward speed are fixedly supported in correspondence with each other.

The shift-and-select shaft is provided with a striker (not shown) which is the gear shift-and-select lever, and the striker is connected to the yokes of the three gear shift forks. The gears selectively engaged with a head (not shown)
The shift fork can be selectively shifted.

The shift air cylinder 11 is provided with a cylinder body 30 and two cylinder chambers (not shown) in the cylinder body 30 so that the shift air cylinder 11 can reciprocate and slide. Assembled with a partitioning piston (not shown) and a two-sided operating rod (not shown) fixed to the piston, and in relation to the select air cylinder 12 thereof, as can be seen from FIG. Located in the gear shift housing 52, and
One end of each of the operation rods on both sides is connected to the shift and select shaft so that the shift and select shaft can reciprocate in the shift direction.

The select air cylinder 12 is provided with a cylinder body 31 and two cylinder chambers (not shown) arranged in the cylinder body 31 so as to be capable of reciprocating sliding movement. Assembled with a partitioning piston (not shown) and a double-sided operating rod (not shown) fixed to the piston, which is associated with its shift air cylinder 11 as can be seen from FIG. It is located in the gear shift housing 52, and one end of the operating rods on both sides of the shift and
By connecting to the select shaft, the shift and select shaft can be reciprocated in the select direction.

The first shift solenoid valve 13 is a three-port, two-position type directional control valve.
The cylinder 11 of the cylinder 11 is integrally assembled by being screwed to the cylinder body 30.
A coil (not shown) is electrically connected to the controller 25, and the solenoid coil is energized and degaussed to the shift air cylinder 11
Compressed air is supplied to and discharged from one of the cylinder chambers.

The second shift solenoid valve 14 is likewise
A three-port, two-position type directional control valve, which is integrally assembled by screwing onto the cylinder body 30 of the shift air cylinder 11, and has a solenoid coil (not shown) as its controller 25. , And its solenoid coil is excited and demagnetized to supply compressed air to the other cylinder chamber of the shift air cylinder 11.
Discharge.

The first select solenoid valve 15 is a three-port, two-position type directional control valve, which is integrally assembled by being screwed to the cylinder body 31 of the select air cylinder 12. Plumbing 26
Is connected to the air tank 22 and a solenoid coil (not shown) is electrically connected to the controller 25, and the solenoid coil is energized and demagnetized to select the selected air.・ Cylinder 1
Compressed air is supplied to and discharged from one of the two cylinder chambers.

Similarly, the second select solenoid valve 16 is a three-port, two-position type directional control valve, and is integrally assembled by being screwed to the cylinder body 31 of the select air cylinder 12. Is connected to the air tank 22 by the pneumatic pipe 26, and a solenoid coil (not shown) is electrically connected to the controller 25, and the solenoid coil
The coil is excited and demagnetized to supply and discharge compressed air to the other cylinder chamber of the select air cylinder 12.

The high air pressure supply solenoid valve 19 is a 2-port / 2-position type directional control valve, which electrically connects a solenoid coil 32 to its controller 25, and the solenoid coil 32 is excited. High-pressure air is supplied to the shift air cylinder 11.

The low air pressure supply solenoid valve 21 similarly has
A 2-port / 2-position type directional control valve in which a solenoid coil 33 is electrically connected to its controller 25, and the solenoid coil 33 is excited to supply low pressure air to the shift air cylinder 11. To do.

The gear change unit 23 is mounted on a stand (not shown) fixed to the floor adjacent to the driver's seat and assembled so that it can be operated with a fingertip. More specifically, the gear change unit 23 includes first and second shift switches (not shown) arranged in a gear change box 34 and first and second select switches. (Not shown)
And the first and second shift switches and the first and second shift switches moved into the speed gate pattern of a top plate (not shown) that is screwed into the opening of the gear change box 34. Finger-operated gear change lever 2 that operates the 2 select switches
It is assembled including 4 and. Of course, the first and second shift switches are used for the first and second shift solenoid valves 13, 14, and the first and second select switches are for the first and second shift switches. Used for the two select solenoid valves 15, 16.

Further, the gear change unit 23
Then, the gear change lever 24 receives a reaction force from an air reaction cylinder (not shown) as it moves into the speed gate pattern, and
Any speed within that speed gate pattern
When the gate is shifted, that is, when the shift is completed, the reaction force is released from the air reaction cylinder so that the completion of the shift operation can be sensed. Of course, the air reaction cylinder is connected to the air tank 22 by pneumatic piping (not shown) in which a pressure reducing valve (not shown) and a manual solenoid valve (not shown) are arranged.

The controller 25 is mainly composed of an input and output circuit, a memory circuit, an arithmetic circuit, a control circuit, and a power supply circuit, and the input circuit is the first and second of the gear change unit 23. Shift switch and first and second select switches, shift position sensor 35, select position sensor 36,
Transmission / gear position sensor 37, clutch position sensor 38, and transmission oil temperature sensor 3
9 is electrically connected to the output circuit, while its output circuit is
And second shift solenoid valves 13, 14, first and second
Select solenoid valves 15 and 16, high air pressure supply solenoid valve 1
9 and the low air pressure supply solenoid valve 21 and is electrically connected to the low air pressure supply solenoid valve 21, and its gear change unit 23 is operated by the driver to perform gear change control for normal running and gear change for emergency running. Control
Then, at that time, the shift operation of the shift air cylinder 11 is controlled where the power shift assist amount is changed according to the oil temperature of the mechanical transmission 50 to enable the power shift.

Next, the operation of the above-described shift operating device 10 will be described. The shift operating device 10 includes a shift position sensor 35, a select position sensor 36, a transmission gear position sensor 37, and a clutch in addition to an electric signal of the gear change unit 23 whose controller 25 is operated by the driver. An electric signal of the position sensor 38 is input to determine output currents for the first and second shift solenoid valves 13 and 14 and the first and second select solenoid valves 15 and 16, and
The output current is passed through the corresponding first and second shift solenoid valves 13 and 14 and the first and second select solenoid valves 15 and 16, and the shift solenoid valves 13 and 14 and the select solenoid valves 15 and 16 The mechanical transmission 50 is operated to change gears by selectively controlling opening and closing.
Of course, the speed change operation is performed for normal traveling and emergency traveling of the route bus, and particularly for emergency traveling of the route bus, it is performed at the first forward speed and the reverse speed.

The controller 25 inputs the electric signal of the transmission oil temperature sensor 39 again to the high air pressure supply solenoid valve 19 and the low air pressure supply solenoid valve 21 during the shifting operation thus performed. The output current to be selectively flown is determined, and the output current is selectively flown to the high air pressure supply solenoid valve 19 and the low air pressure supply solenoid valve 21 to open and close the high air pressure supply solenoid valve 19 and the low air pressure supply solenoid valve 21. The power of the shift air cylinder 11 is controlled by changing the power shift assist amount of the shift air cylinder 11 according to the oil temperature of the mechanical transmission 50.
Allow shifts.

More specifically, when the oil temperature of the mechanical transmission 50 is low and equal to or lower than a predetermined value, the controller 25 inputs an electric signal corresponding to the low oil temperature from the transmission oil temperature sensor 39. To determine the output current, and the solenoid coil 32 of the high air pressure supply solenoid valve 19 is energized, while the solenoid coil 33 of the low air pressure supply solenoid valve 21 is energized. The high air pressure supply solenoid valve 19 is opened, while the low air pressure supply solenoid valve 21 is opened.
Is closed.

When the high air pressure supply solenoid valve 19 is opened, the air pressure is not reduced and flows from the air tank 22 to the first and second shift solenoid valves 13 and 14 through the high air pressure pipe 17. The shift air cylinder 11 can be supplied. In that state, when the first and second shift solenoid valves 13 and 14 are selectively opened and closed,
The shift air cylinder 11 uses high air pressure to
Selectively shift one gear shift fork.
In this case, the shift operation by the shift air cylinder 11 is performed when the power shift assist amount is fully assisted.

When the oil temperature of the mechanical transmission 50 is equal to or higher than a predetermined value, the controller 25 receives an electric signal corresponding to the high oil temperature from the transmission oil temperature sensor 39 to determine the output current. Then, the solenoid coil 32 of the high air pressure supply solenoid valve 19 is cut off from current, and at the same time, the solenoid coil 33 of the low air pressure supply solenoid valve 21 is supplied with current and the high air pressure supply solenoid valve is closed. 19 is closed, while its low air pressure supply solenoid valve 21 is opened.

When the low air pressure supply solenoid valve 21 is opened, the air pressure is reduced by the pressure reducing valve 20, passes through the low air pressure pipe 18, and from the air tank 22 to the first and second shift solenoid valves 13, The shift to 14
The air cylinder 11 can be supplied. In that state, when the first and second shift solenoid valves 13, 14 are selectively opened and closed, the shift air cylinder 11 selectively operates the three gear shift forks at a low air pressure. To shift. In this case, the shift operation by the shift air cylinder 11 is performed where the power shift assist amount is appropriately reduced.

As described above, the gear shift operating device 10 carries out gear shifting operations during normal running and emergency running of the route bus, and in particular, the shifting operation performed in the gear shifting operation is performed by the oil of the mechanical transmission 50. When the temperature is low and a large operating force is required for gear shifting, the shift air cylinder 11 is moved by high air pressure to fully assist the operating force, and the oil temperature of the mechanical transmission 50 is high. When a large operating force is no longer required for shifting, the shift air cylinder 11 is moved by a low air pressure and the operating force is lightly assisted. In this way, in the gear shift operating device 10, the shift operation is made possible by optimally changing the power shift assist amount according to the oil temperature of the mechanical transmission 50, and as a result, the performance is improved. If necessary and sufficient, the load applied to the synchronizing mechanism of the mechanical transmission 50 is adapted to the oil temperature of the mechanical transmission 50, and the oil temperature rises,
The load on the synchronizing mechanism is reduced, damage to the synchronizing mechanism is prevented in long-term use, and the durability of the synchronizing mechanism is improved.

As will be apparent from the specific embodiments of the present invention described above with reference to the drawings, those of ordinary skill in the art to which the present invention pertains have the subject matter of the present invention. Is the nature of the invention (na
It is easily embodied in other embodiments that are derived from the true) and substance and that are objectively recognized as having them internalized. Of course, the contents of the present invention are essential to the establishment of the invention in accordance with the problems of the invention.

[0029]

Benefits of the Invention As will be understood from the above, the gear shift operating device used in the mechanical transmission of the present invention is a gear shift and select lever which is selectively engaged with a plurality of gear shift forks. And a shift air cylinder that moves the shift and select shaft in the shift direction
A select air cylinder that moves the gear shift and select lever in the select direction on the and select shaft, and a plurality of shift solenoid valves that allow air pressure to be supplied to and discharged from the shift air cylinder, A plurality of select solenoid valves connected to the air pressure source to supply and exhaust air pressure to the select air cylinder, high air pressure piping and low air pressure piping connecting the air pressure source to the shift solenoid valve, and high air pressure piping A high air pressure supply solenoid valve that is arranged to open the transmission oil temperature below a predetermined value and that can supply high pressure air from the air pressure source to the shift air cylinder, and a pressure reducing valve that is arranged in the low air pressure pipe. Valve and downstream of the pressure reducing valve in the low air pressure pipe to open the transmission oil temperature above a predetermined value, and The shift operation device used in the mechanical transmission of the present invention includes a low air pressure supply solenoid valve that enables low air pressure to be supplied from the air pressure source to the shift air cylinder. The power shift assist amount is changed according to the oil temperature of the power transmission, power shift becomes possible, performance is secured sufficiently, and when the oil temperature of the mechanical transmission becomes high, the synchro mechanism of the mechanical transmission becomes The load on the synchro mechanism is reduced and damage to the synchro mechanism is prevented during long-term use, and the durability of the synchro mechanism is improved accordingly, which is very useful and practical for mechanical transmissions. .

[Brief description of drawings]

FIG. 1 is a schematic view showing a specific example of a gear shift operating device used in a mechanical transmission of the present invention applied to a mechanical transmission of a route bus.

[Explanation of symbols]

 11 shift air cylinder 12 select air cylinder 13 first shift solenoid valve 14 second shift solenoid valve 15 first select solenoid valve 16 second select solenoid valve 17 high pneumatic piping 18 low pneumatic piping 19 high Air pressure supply solenoid valve 20 Pressure reducing valve 21 Low air pressure supply solenoid valve 23 Gear change unit 25 Controller

Claims (1)

[Claims] 1. A gear shift and select device that is selectively meshed with a plurality of gear shift forks.
A shift air cylinder that moves a shift-and-select shaft with a lever in the shift direction, and a select air that moves the gear shift-and-select lever on the shift-and-select shaft in the select direction.・ Cylinder and a plurality of shift solenoid valves that allow air pressure to be supplied to and discharged from the shift air cylinder
A plurality of select solenoid valves connected to the air pressure source to supply and exhaust air pressure to the select air cylinder, high air pressure piping and low air pressure piping connecting the air pressure source to the shift solenoid valve, and high air pressure piping A high air pressure supply solenoid valve that is arranged to open the transmission oil temperature below a predetermined value and that can supply high pressure air from the air pressure source to the shift air cylinder, and a pressure reducing valve that is arranged in the low air pressure pipe. A valve and a low pressure pipe located downstream of the pressure reducing valve to open the transmission oil temperature above a predetermined value, and to provide low air pressure from the air pressure source to the shift air cylinder. A speed change operation device used in a mechanical transmission including an air pressure supply solenoid valve.