JPH068368Y2 - Operating device for range change type multi-speed transmission - Google Patents

Description

Detailed Description of the Invention a. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating device for a range change type multi-stage transmission, and in particular, after the range change of the auxiliary transmission is completed by selecting the change lever, the compressed air is discharged from the cylinder chamber of the auxiliary transmission operating actuator. The present invention relates to an operating device configured to exhaust air.

b. Conventional technology For large vehicles such as trucks and trailers, it is possible to economically drive urban areas, highways, complicatedly curved slopes and uneven ground surfaces, etc., with optimal transmission gear ratios. There is a tendency for a transmission having a wider speed range to be required. As such a transmission, a combination of a main transmission and an auxiliary transmission is already known, and a so-called range change type is known as its transmission method. As shown in FIG. 8, this range change type has a gear shift pattern corresponding to a shift stage from a low speed range to a high speed range. The sub-transmission switches from the low speed range to the high speed range during the selective movement to the select position 53. At this time, the select position of the main transmission is not switched.

c. Problems to be Solved by the Invention Although the conventional range change type multi-stage transmission is roughly as described above, the following problems have been pointed out in this transmission. That is, the gear change of the auxiliary transmission is performed by the actuator linked with the select operation of the change lever 51, but conventionally, even after completing the high-speed / low-speed range change, compressed air is supplied to one of the cylinder chambers of this actuator. Was left alone. For this reason, when compressed air is supplied to the other cylinder chamber and a range change is to be performed again, the compressed air in the one cylinder chamber must be exhausted at the same time, and this exhaust cannot be completed speedily. The actuator stroke was delayed, which hindered speedy range changes.

The present invention was devised to effectively solve the above-mentioned problems, and its purpose is to immediately discharge compressed air from the cylinder chamber of the actuator after completing the gear change of the auxiliary transmission. An object of the present invention is to provide an operating device of a range-change type multi-stage transmission that can be operated.

d. Means for Solving the Problems In order to solve the above-mentioned problems, the present invention is provided with a plurality of shift rods having shift forks and a shift shaft that rotates in association with a shift operation of a change lever, and the above shift. A main transmission having a shift lever that can be selectively engaged with the rod and a select arm that selectively moves the shift lever in the axial direction of the shift shaft in conjunction with a select operation of the change lever; A multi-stage transmission comprising: an auxiliary transmission that switches the output of the machine to a high speed range or a low speed range by a high speed gear or a low speed gear; and an actuator that switches and operates the high speed gear and the low speed gear. It has an empty switching valve connected to each of the high-speed side cylinder chamber and the low-speed side cylinder chamber. An air pressure supply system, (b) a first detection stage for detecting the high speed side and low speed side select positions of the select arm, and (c) a first detection stage for detecting the high speed side and low speed side stroke completion positions of the actuator. 2 detection means and (d) a pair of detection results of the first and second detection means are compared, and when one of these detection results is on the high speed side and the other is on the low speed side, one of the air pressure supply systems is connected. In addition to the supply mode, when both of the detection results are on the high speed side or the low speed side, both of the air pressure supply systems are placed in the exhaust mode.

e. In the operating device configured as described above, when the change lever is switched to the low speed range or the high speed range, one of the first detecting means and the second detecting means is on the high speed side and the other is on the low speed side. Different detection results are obtained, and the control means sets the low speed side or high speed side air pressure supply system to the supply mode based on this detection result, so that the actuator operates and the gear shift of the auxiliary transmission is performed. When the stroke of the actuator is completed and the gear change is completed, the second detecting means detects this, and the detection result matches the detection result of the first detecting means. When the detection results thus match, the control means sets both of the air pressure supply systems to the exhaust mode based on this, so that the compressed air in the cylinder chamber is exhausted to the outside. As described above, according to the present invention, the compressed air in the cylinder chamber is quickly exhausted after the completion of the stroke of the actuator. Therefore, when the actuator is operated in the opposite direction, the operation is extremely smooth and speedy. A range change can be realized.

f. Embodiment An embodiment of the present invention will be described below with reference to the drawings. First
FIG. 4 to FIG. 4 (c) show a first embodiment of the present invention, in which a mechanical switching valve is used. On the other hand, the second embodiment shown in FIGS.
It uses an electromagnetic switching valve.

First, the first embodiment will be described. FIG. 1 is a side view of a transmission 1 to which the present invention is applied, in which 2 is a main transmission, 3 is an auxiliary transmission, and 4 is a clutch. Is. An operation device 6 for operating the main transmission 2 is mounted on the upper surface of the housing 5 of the main transmission 2, and the auxiliary transmission 3
An actuator 8 for operating the auxiliary transmission 3 is mounted on the upper surface of the housing 7.

[Main transmission operating device]

The operating device 6 is, as shown in detail in FIG. 2, a case 9 fixed to the housing 5 of the main transmission 2 with bolts (not shown), and a horizontal direction (in FIG. 2, a direction perpendicular to the paper surface) in the case 9. ) And a rotatable shift shaft (10) disposed in (4). One end of the shift shaft 10 is connected to a driver's seat change lever via a shift link (not shown).
The 10 is adapted to rotate clockwise or counterclockwise in FIG. A spline 11 is formed on the outer peripheral surface of the shift shaft 10, and the base end portion of the shift lever 12 is formed on the spline 11.
12a is slidably fitted. The tip 12b of the shift lever 12 projects into the main transmission 2.

On the other hand, in the main transmission 2, as shown in FIG. 3, three shift rods 13 to 15 are arranged parallel to each other and horizontally.
Of these three shift rods 13 to 15, a pair of yokes 16 and 17 is fixedly mounted on the intermediate shift rod 14, and one yoke 18 and 19 is fixedly mounted on the shift rods 13 and 15 on both sides. ing. The tip portion 12b of the shift lever 12 can be selectively engaged with any one of the yokes 16 to 19.

As shown in FIG. 2, a shaft hole 22 is formed in the case 9 of the operating device 6 in the vertical direction, and a select shaft 23 is rotatably inserted in the shaft hole 22. The lever 24 fixed to the upper end of the select shaft 23 is connected to the change lever of the driver's seat via a select link (not shown). Further, the tip end portion 25a of the select arm 25 fixed to the lower end portion of the select shaft 23 has an engaging hole 2 formed in the middle portion of the shift lever 12.
Fitted in 6. Then, when the change lever is selected, the tip of the select arm 25 works in conjunction with this.
25a moves in the direction of arrow a or b in FIG. 3, the shift lever 12 slides in the axial direction of the shift shaft 10, and the tip portion 12b of the shift lever 12 has four yokes 16-19.
To engage with any one of the above.

A relay valve unit 27 is attached to the side of the operating device 6 as shown in FIGS. 1 and 2. The relay valve unit 27 is interlocked with the select movement of the shift lever 12 or the stroke of the actuator 8 and the auxiliary transmission 3
Is an air supply system for supplying / discharging compressed air to / from the actuator of FIG. 4, including two mechanical switching valves 31, 32 and two pilot pressure switching valves 33, 34 as shown in FIGS. 4 (a) to (c). It is composed of. Among these, the valves 31 and 32 are adapted to be switched by a cylindrical cam 37. More specifically, the cam 37 is slidably inserted into a guide shaft 38 arranged in parallel with the shift shaft 10 as shown in FIG.
A spherical head portion 37a integrally provided on the outer peripheral surface of 37 is fitted into a fitting hole 39 formed on the outer peripheral surface of the base end portion 12a of the shift lever 12. Therefore, the cam 37 slides along with the shift lever 12 in the longitudinal direction of the shift shaft 10.

On the other hand, the piston rod 40 of the actuator 8 is shown in FIG.
As shown in (a) to (c), it is attached to the chevron cam 41, and the chevron cam 41 causes the valves 35 and 36 to perform a switching operation. Further, the valves 33, 34 are designed to be switched by receiving the pressure from the valves 35, 36.

The six valves 31 to 36 are connected by pipes as shown in FIGS. 4 (a) to 4 (c), respectively. Now, as shown in FIG. 4 (a), the change lever 51 is connected to the 4-5th speed select position ( High speed range) 53 to 2-3 speed select position (low speed range)
When moved to 52, the cam 37 slides from the position shown by the chain line in FIG. 4 (a) to the position shown by the solid line. When the cam 37 slides in this way, the contact 31a of the valve 31 is pushed by the cam 37 and the valve 31 is switched to the supply mode, and the contact 32a of the valve 32 is disengaged from the cam 37 and the valve 32 is exhausted. Switch to.

On the other hand, when the actuator 8 is operating on the high speed side as shown in FIG. 4 (a), the contact 35a of the valve 35 is pushed by the chevron cam 41 and the valve 35 is in the supply mode. Further, the contact 36a of the valve 36 comes off the chevron 41 and the valve 3
6 is in exhaust mode. Therefore, the pilot pressure is applied to the valve 34, and the valve 34 is in the exhaust mode. Also, the valve 33 is in the supply mode.

Therefore, the air pressure supply system constituted by the valves 31 and 33 enters the supply mode, so that the compressed air in the air tank 42 is supplied to the low speed side cylinder chamber 43 of the actuator 8 via the valves 31 and 33, and the piston 45 moves to the first position. Move to the right in Fig. 4 (a). At this time, the high speed side cylinder chamber 44 is
Since it communicates with the atmosphere through 34, it does not hinder the movement of the piston 45.

When the piston 45 moves to some extent, the chevron cam 41 is disengaged from the contact 35a and the valve 35 is switched to the exhaust mode, as shown in FIG. 4 (b). When the valve 35 is switched to the exhaust mode in this way, the pilot pressure acting on the valve 34 is released, and the valve 34 is switched to the supply mode. However, since the valve 32 is in the exhaust mode at this time, the valve 32
The air pressure supply system constituted by 32 and 34 is in the exhaust mode, and the high speed side cylinder chamber 44 is still in communication with the atmosphere via the valves 34 and 32. Therefore, the piston 45 of the actuator 8 intermittently moves to the right.

Next, when the piston 45 moves to the right end as shown in FIG. 4 (c), the auxiliary transmission 3 switches to the low speed side and the valve
The contact 36a of 36 is pushed by the chevron cam 41 to switch the valve 36 to the supply mode. When the valve 36 is switched to the supply mode, pilot pressure is applied to the valve 33 to switch the valve 33 to the exhaust mode. Therefore, the compressed air in the low speed side cylinder chamber 43 is exhausted to the outside via the valve 33.

Above is the change lever 51 from the 4-5 speed select position (high speed range) 53 to the 2-3 speed select position (low speed range) 52.
It shows the operating state of the valve when it is moved to, but when it is moved from the 2-3 speed select position 52 to the 4-5 speed select position 53, the operation is completely opposite to the above. .

As described above, according to the present invention, the drive pressure is exhausted from the actuator 8 at the same time when the switching of the auxiliary transmission is completed, so that the operability when the auxiliary transmission is changed back to the original state is extremely speedy.

Although the above description is for the first embodiment of the present invention, the present invention is not limited to the first embodiment, and may be modified as shown in, for example, the second embodiment. In the second embodiment, a pair of limit switches 46 and 47 are provided as shown in FIGS.
And 48 and 49, and a pair of electromagnetic switching valves 54 and 55. The pair of limit switches 46, 47 constitutes a second detecting means, and is turned on and off by the chevron cam 41 attached to the piston rod 40.
In Fig. 5, limit switch 46 is ON, limit switch
47 is off. The limit switches 48 and 49 constitute the first detecting means, and are turned on and off by the select movement of the change lever 51. As shown in FIG. 7, the limit switch 49 is turned on and off in the low speed range. The switch 48 is turned off, and the limit switch 49 is turned off and the limit switch 48 is turned on in the high speed range. Of the pair of solenoid valves 54, 55, one solenoid valve 54 is arranged in a passage connecting the air tank 42 and the high speed side cylinder chamber 44, and the solenoid valve 55 connects the air tank 42 and the low speed side cylinder chamber 43. Is arranged in the passage.

The limit switches 46 to 49 and the solenoids 54a and 55a of the solenoid valves 54 and 55 are wired as shown in FIG. 6, and the solenoid 54a and 55a are connected only when the limit switches 46, 48 and 55a are simultaneously turned on.
Power is supplied to a or 55a. Therefore, the seventh
As shown in the figure, when the change lever 51 is moved from the 4-5 speed select position (high speed range) to the 2-3 speed select position (low speed range), the valve 55 is first turned ON to enter the supply mode and the air tank 42 Compressed air is supplied to the low speed side cylinder chamber 43. When compressed air is supplied to the low speed side cylinder chamber 43, the piston 45 moves to the right as shown in FIG. 5 to switch the auxiliary transmission 3 to the low speed range. When this changeover is completed, the limit switch 47 moves to the angle cam 41.
Is turned off, the valve 55 is turned off, and the exhaust mode is set. Therefore, the compressed air in the low speed side cylinder chamber 43 is exhausted to the outside at the same time when the switching of the auxiliary transmission 3 is completed. When the change lever 51 is moved from the low speed range to the high speed range, the reverse operation is performed.

The embodiments of the present invention have been described above, but the present invention is not limited to the above-mentioned embodiments, and various modifications can be made.
For example, the first detecting means for detecting the high speed side and low speed side select positions of the select arm 25 (or the change lever 51) is the contactor 3 of the valves 31 and 32 in the first embodiment.
1a and 32a, and limit switches 48 and 49 in the second embodiment, but may be other detection means. Further, the second detecting means for detecting the stroke completion positions of the high speed side and the low speed side of the actuator 8 is constituted by the contacts 35a, 36a of the valves 35, 36 in the first embodiment,
Although the limit switches 46 and 47 are used in the second embodiment, other detecting means may be used. Further, as the control means of the switching valve for supplying and discharging the compressed air to and from the actuator 8, various control means other than the mechanical control means shown in the first embodiment and the electric control means shown in the second embodiment. Can be adopted.

f. As described above, the present invention supplies the compressed air to the actuator only when the actuator is operated by the first detecting means, the second detecting means and the control means, and stops the operation of the actuator otherwise. Since the compressed air in the cylinder chamber of the actuator is exhausted to the outside at the same time when the switching of the auxiliary transmission is completed, the speed at which the actuator is operated in the reverse direction is fast and a quick range change is possible. Is.

[Brief description of drawings]

1 to 4 (c) show a first embodiment of the present invention, in which FIG. 1 is a side view of a transmission, and FIG. 2 is a longitudinal sectional view of an operating device of a main transmission. 3 is a side view of the shift shaft, and FIGS. 4 (a), 4 (b) and 4 (c) are piping diagrams of the operating device of the auxiliary transmission. FIGS. 5 to 7 show a second embodiment of the present invention. FIG. 5 is a piping diagram of an operating device of an auxiliary transmission, and FIG. 6 is a solenoid wiring diagram of an electromagnetic switching valve. , FIG. 7 is a schematic plan view of a gear shift pattern for explaining an operating range of a limit switch. FIG. 8 is a plan view of a conventional gear shift pattern. 2 ... Main transmission, 3 ... Sub transmission, 8 ... Actuator, 10 ... Shift shaft, 12 ... Shift lever, 13-15 ... Shift rod, 25 ... Select arm, 31-36 ... Changeover valve, 37 ... Cam, 41 ... chevron cam, 42 ... air tank, 43 ... low speed side cylinder chamber, 44 ... high speed side cylinder chamber, 45 ... piston, 46 ~ 49 ... limit switch, 54, 54 ... electromagnetic switching valve.

Claims (1)

[Scope of utility model registration request] 1. A plurality of shift rods having shift forks, a shift lever mounted on a shift shaft that rotates in conjunction with a shift lever shift operation, and selectively engageable with the shift rods, and a change lever. Of the main transmission having a select arm for selectively moving the shift lever in the axial direction of the shift shaft in conjunction with the select operation of, and the output of the main transmission is set to a high speed range or a low speed range by a high speed gear or a low speed gear. In a multi-stage transmission including an auxiliary transmission for switching to the above and an actuator for switching between the high speed gear and the low speed gear, (a) connected to the high speed side cylinder chamber and the low speed side cylinder chamber of the actuator, respectively. Air supply system with switching valve, (b) High speed side and low speed of the select arm Detection means for detecting the side select position; (c) second detection means for detecting the high speed side and low speed side stroke completion positions of the actuator; and (d) the first and second detections. A pair of detection results of the means are compared, and when one of the detection results is on the high speed side and the other is on the low speed side, one of the air pressure supply systems is set to the supply mode, and both of the detection results are on the high speed side or the low speed side. And a control means for setting both of the air pressure supply systems to the exhaust mode at this time.