JPS61290266A - Operating device for range change type speed change gear - Google Patents

Abstract

PURPOSE:To prevent the mulfunction of the change lever in the captioned device by inhibiting the operation of selecting the change lever to a predetermined position before finishing the changeover of gears of an auxiliary speed change gear. CONSTITUTION:When a change lever 135 is selected at the position X shown in figure, directional control valves 29, 30, 99, 100 are respectively subjected to be set at the condition shown in figure. Thus, a higher side stopper mechanism 37 is stoppedly operated and a lower side stopper mechanism 38 is released. Therefore, a valve body 101 is pushed up and the compressive air in an air reserver 59 is introduced to the pressure chamber 39 of the higher side stopper mechanism 37 through a passage 123 a valve lifter chamber 124 a passage 128 and thereby a stopper piston 37b is subjected to be forcedly attached to a cushion ring 138. When the change lever 135 is selected from the position X to the position Y, an auxiliary speed change gear is selected from the higher side to the lower side.

Description

Detailed Description of the Invention: a. Field of Industrial Application The present invention relates to an operating device for a range change type transmission, and particularly when changing the range of the auxiliary transmission by selecting a change lever, The present invention relates to an operating device in which a change lever cannot be operated to a desired selection position until after the operation of an actuator is completed.

b. Conventional technology For large vehicles such as trunks and trailers, it is possible to drive economically on city streets, highways, intricately curved slopes, uneven roads, etc. by adjusting the optimal transmission gear ratio for each. Therefore, there is a tendency for a multi-stage transmission with a wider shift range to be required. As such a multi-stage transmission, one in which a main transmission and a sub-transmission are combined is already known, and the transmission methods thereof are also known, such as a so-called splitter type and a range change type.

The former is a multi-stage transmission with an auxiliary transmission configured so that it can switch between high and low at each shift position in the gear shift pattern, but it is not recommended to increase the allowable input torque or increase the gear ratio. I'm not good at it.

On the other hand, range change type transmissions have large gear ratios,
In addition, since it is possible to increase the allowable input torque, it tends to be frequently used as a transmission suitable for the recent large-sized vehicles that are oriented toward high tractive force.

However, this range change type transmission has a drawback in that the speed change operation is rather complicated.

In order to improve this, a transmission device has been devised in which a so-called double S Hs shift pattern is obtained in which all transmission ratios from the low range to the high range have their own shift positions.

In other words, when the driver operates the change lever installed in the driver's cab in the same way as a normal transmission, the select movement of the change lever is detected and the sub-transmission is set to high.
It is designed so that low is automatically switched by actuation of a hydraulic actuator.

However, in conventional devices of this kind, when switching between high and low in the sub-transmission, a device was devised to notify the driver that the changeover would be made by applying appropriate resistance to the select operation of the change lever. However, this alone does not clearly convey to the driver that the high/low switching is complete, so the driver may shift gears before the high/low switching is complete, resulting in an accident involving the gear synchronization mechanism or the gear itself. There remains a fear that this will continue.

C8 Problems to be solved by the invention Conventional range change type transmissions are generally as described above, but this transmission requires operation of the change lever while confirming the completion of high/low gear changes each time with a confirmation lamp etc. This makes driving operations complicated, and in some cases, there is a risk of damaging the sub-transmission gears, etc. due to incorrect operation, such as shifting the change lever before the high/low gear change is completed. .

The present invention was developed in view of the above circumstances, and its purpose is to prevent the change lever from being operated to the desired select position until the gear change of the auxiliary transmission is completed. In this way, erroneous operation of the change lever is reliably prevented, and the driver is made to sense the completion of the gear change of the sub-transmission by the feeling of operating the change lever, thereby eliminating the hassle of checking the confirmation lamp every time the range is changed. The purpose is to omit.

d1 Means for solving the problem When the auxiliary transmission is switching between high and low gears,
A stopper mechanism using fluid pressure is installed at an appropriate part that moves or rotates in conjunction with the gear selection operation of the change lever installed in the driver's cab, and the stopper mechanism is installed until the high/low gear change of the sub-transmission is completed. The gear select movement stopper functions to restrict the select movement of the change lever, and when the high/low gear change of the auxiliary transmission is completed, the stopper function is released and the change lever can be moved freely to the desired gear select position. The problem was solved by installing a new mechanism.

An embodiment in which the present invention is applied to a range change type seven-speed transmission will be described below with reference to the drawings.

FIG. 1 shows a side view of a transmission 1 to which the present invention is applied, in which 2 is a main transmission, 3 is a sub-transmission, and 4 is a clutch. An operating device 6 for operating the main transmission 2 is attached to the upper surface of the housing 5 of the main transmission 2, and an actuator 8 for operating the auxiliary transmission 3 is attached to the upper surface of the housing 7 of the auxiliary transmission 3. installed.

[Main transmission operating device]

More specifically, as shown in FIG. 2, the operating device 6 includes a case 9 fixed to the housing 5 of the main transmission 2 with bolts (not shown), and a case 9 that is attached horizontally (in FIG. 2, perpendicular to the plane of the paper). ) is provided with a rotatable shift shaft 10. One end of this shift shaft 10 is connected to a change lever on the driver's seat via a shift link (not shown), and in conjunction with the shift operation of the change lever, the shift shaft 10 moves clockwise or counterclockwise in FIG. It is designed to rotate in the direction. A spline 11 is formed on the outer peripheral surface of the shift shaft IO, and a base end 12a of a shift lever 12 is slidably fitted onto the spline 11. The tip end 12b of the shift lever 12 protrudes into the main transmission 2.

On the other hand, within the main transmission 2, three shift rods 13 to 15 are arranged parallel to each other as shown in FIG. 3fa). Among these three shift bars 13 to 15, the middle shift bar 14 has a pair of shift levers and a yoke 16 as a retaining surface.
．． 17 is fixedly installed, and one yoke 18, 19 is fixedly installed on each of the shift rods 13 and 15 on both sides. The tip end 12b of the shift lever 12
19 can be selectively engaged with.

As shown in FIG. 2, a shaft hole 22 is vertically formed in the case 9 of the operating device 6, and a select shaft 23 is rotatably inserted into this shaft hole 22. A lever 24 fixed to the upper end of the select shaft 23 is connected to a change lever on the driver's seat via a select link (not shown). Further, the tip portion 25a of the select arm 25, which is fixed to the lower end portion of the select shaft 23, is loosely fitted into an engagement hole 26 formed in the shift lever 12. When the change lever is operated to select, the tip 25a of the select arm 25 moves in the direction of arrow a or b in FIG. Move the tip m of the shift lever 12
12b is adapted to engage with any one of the four yokes 16-19.

A relay valve unit 27 is attached to the side of the operating device 6, as shown in FIGS. 1 and 2. This relay valve unit 27 is for controlling the supply of compressed air to the actuator 8 of the sub-transmission 3 in conjunction with the select movement of the shift lever 12, and is connected to the shift shaft as shown in FIGS. 2 and 4. 10 and a valve operating shaft 28. It is composed of a first direction control valve 29 and a second direction control valve 30.

[Valve operation shaft]

The valve operating shaft 28 is arranged so as to be slidable and rotatable in the directions of arrows c and d in FIG. 32 are inserted adjacent to each other. The distal end 31b of the connecting arm 31 is fitted into a fitting hole 33 formed in the base end 12a of the shift lever 12, as shown in FIGS. 2 and 4, so that the shift lever 12 is connected to the shift shaft 10. When the valve operating shaft 28 is selectively moved along the same direction, the valve operating shaft 28 also slides in the same direction. In addition, the valve operation shaft 2
Retaining rings 34 and 35 are fitted onto the outer circumferential surface of the connecting arm 31 and the cam sleeve 32 from moving in the axial direction by these two retaining rings 34 and 35.

A high side stopper mechanism 37 and a low side stopper mechanism 38 are respectively disposed in a case 36 that pivotally supports both ends of the valve operating shaft 28. These stoppers 37, 38 are cylinders 37a, 3 formed in the axial direction of the valve operating shaft 28.
8a, and stopper pistons 37b and 38b that are slidably disposed within these cylinders 37a and 38a. Pressure chambers 39.40 are formed behind the stopper pistons 37b and 38b, respectively, and these pressure chambers 39.40 are connected to a third directional control valve 99 and a third direction control valve as stopper control means, which will be described later, through conduits 128.129. 4 directional control valve 100 pressure outlet 126.12
7 are connected to each other. When compressed air is introduced into the pressure chamber 39 or 40, the stopper screw 1 37
b or 38b moves forward to move the valve operating shaft 28 to the high side (fourth
direction of arrow d in the figure) or low side (direction of arrow C in figure 4)
Movement to is now regulated. The detailed state of movement restriction of the valve operating shaft 28 will be clarified in relation to the selection operation of the change lever 135, which will be described later.

The cam sleeve 32 is connected to the first and second directional control valves 2.
9.30, a step portion 46 is formed at approximately the center of the outer circumferential surface thereof and slightly protrudes outward in the radial direction, and this step portion 46 allows first and second directional control. The operating balls 47 and 48 of the valves 29 and 30 are pushed up. A pair of inclined portions 49.50 are formed at both ends of the stepped portion 46, so that the operating balls 47.48 can smoothly slide into the stepped portion 46 when the valve operating shaft 28 is slid.
It is configured to ride on.

[First and second directional control valves] The first and second directional control valves 29.30 have the same structure as shown in FIG. Valve lifter chambers 55 and 56 are provided.The valve chambers 53 and 54 communicate with each other through a passage 57 serving as a pressure supply port.
is connected to the near reservoir 59 via a pressure supply port 60 and a conduit 58. Therefore, compressed air from the near reservoir 59 is always introduced into the valve chambers 53 and 54. Valve bodies 62,63 are disposed within the valve chambers 53,54, and these valve bodies 62,63 are constantly held in the valve seat hole 6 by springs 64,65.
It is energized on the 6th and 67th sides. On the other hand, the valve lifter chamber 5
A cylindrical valve lifter 68,69 having piston portions 68a, 69a is disposed within the valve lifter 5.56 so as to be able to slide vertically in the vertical direction as shown in FIG. The valve lifters 68, 69 have exhaust holes 72, 73 along their axial direction, and these exhaust holes 72, 7
3 is communicated with the outside through an exhaust lower 4.75.

The operation ball 47, 48 and the valve lifter 6B, 69
An operation plunger 79.80 is disposed between the piston portions 68a and 69a of the valve lifter 68.69 and the spring 70.71 when the operation ball 47.48 is pushed up.
It is configured to be pushed up against the When the valve bodies 62 and 63 are pushed up against the springs 64 and 65 by the tips 68b and 69b of the valve lifters 6B and 69, the valve seat holes 66 and 67 are opened and compressed air flows into the valve lifter chambers 55 and 56. is configured to be introduced.

The pressure discharge lower 7 of the valve lifter chamber 55 of the first directional control valve 29 is connected to a low-speed cylinder chamber 93 of an actuator 8, which will be described later, through a first pipe line 81. Further, the pressure discharge lower 8 of the valve lifter chamber 56 of the second directional control valve 30 is connected to a high-speed side cylinder chamber 92 of the actuator 8, which will be described later, through a second pipe line 82.

[Actuator]

The details of the actuator 8 are shown in FIGS. 4 and 5 (al.
As shown in the cylinder 88. It consists of a piston 89 and a piston loft 90, and a shift fork 91 fixed to a piston rod 90 switches the sub-transmission 3 between high and low gears. The above piston 8
A high-speed cylinder chamber 92 and a low-speed cylinder chamber 93 are formed on both sides of the cylinder chamber 92.9.
3 are connected to the pressure discharge lowers 7, 78 of the first and second directional control valves 29, 30 by the first conduit 81 and the second conduit 82, as described above. When compressed air is introduced into the high-speed side cylinder chamber 92, the piston 89
．． The piston rod 90 and the shift fork 91 slide together in the direction of arrow e at ta+ in FIGS. 4 and 5, so that the auxiliary transmission 3 is shifted to a high gear.

Conversely, when compressed air is introduced into the low-speed cylinder 93, the piston 89. The piston rod 90 and the shift fork 91 move together in the direction of the arrow r, thereby switching the sub-transmission 3 to a low gear.

[Stopper control means]

A stopper control means 97 is attached to the piston rod 90 of the actuator 8, as shown in FIGS. 4 and 5. This stopper control means 97 is for operating the above-mentioned high side stopper mechanism 37 and low side stopper mechanism 38, and includes a cam sleeve 98 attached to the piston rod 90, a third directional control valve 99, and a fourth directional control valve 99. directional control valve 100.

The third and fourth direction sides/a99.100 are
It has almost the same configuration as the second directional control valve 29.30, and the spring 103.104 connects the valve seat hole 105.1.
Valve bodies 101 and 102 energized to the 06 side and exhaust hole 11
1.112 and spring 109.110 in FIG.
The valve lifter 107.10B is energized downwardly. The valve chambers 120 and 121 in which the valve bodies 101 and 102 are disposed are communicated with each other by a passage 122, and one valve chamber 120 is connected to the near reservoir 59 by a conduit 123. Therefore, the valve chamber 120.1
Compressed air from the near reservoir 59 is constantly introduced into the tank 21.

On the other hand, the valve lifter chambers 124 and 125 in which the valve lifters 107 and 108 are housed are connected to one valve lifter chamber 1.
24 is connected to the pressure chamber 39 of the high side stopper mechanism 37 via the pressure outlet 126 and the pipeline 128, and the other valve lifter chamber 125 is connected to the pressure outlet 127 and the pipeline 12.
It is connected to the pressure chamber 40 of the low side stopper mechanism 38 via 9. Further, the exhaust holes 111, 112 of the valve lifters 107, 108 communicate with the outside through exhaust ports 113, 114.

The outer peripheral surface 132 of the cam sleeve 98 and the pulp lifter 1
Between the piston portions 107a and 108a of the cam sleeve 98, operating plungers 116, 117 and operating balls 118, 119 are arranged so as to be movable up and down in FIG. A cam hole 133 is formed approximately in the center, and when the actuator 8 completes its operation to the high side as shown in FIG.
As shown in the figure, when the actuator 8 completes its operation to the low side, the other operation ball 118 fits into the cam hole 133.

08 operation The operating device for the range change type transmission is constructed as described above, and by selectively moving the change lever on the driver's seat in the left and right direction in the gear shift pattern 134 shown in FIG. Figure 3 (
In a), it can be moved in the direction of the arrow a or b to engage the yokes 16 to 19 of the desired shift rods 13 to 15.

Here, the select position of the change lever 135 in the shift pattern 134 will be represented by the following symbols for convenience.

Select position for R (reverse) and L speed - - W Select position for 2nd and 3rd speed - - - - - - - -
−・−・−X4th and 5th speed select position −−−−
−−−−−−−−−−−−−−Y 6th and 7th speed select positions ・−・−・−・・−・−・−2′ Change lever 135 select position and shift lever 12 To explain the relationship with the movement position, the change lever 13
When 5 is in position W, the shift lever 12 has moved to 1 so that it engages with the yoke 18. Also, at position X, yoke 1
6, the shift lever 12 is in a position where it engages with the yoke 17 when it is in position Y, and with the yoke 19 when it is in position Z.
is moving.

Therefore, when the change lever 135 is shifted at position W, for example, the shift shaft 10 shown in FIG. Gear or 1st gear is engaged.

In the operating device according to the present invention, the change lever 13
5 from position X to position Y, the sub-transmission 3 is switched from low to high, and the change lever 1
35 from position Y to position X, the sub-transmission 3 is switched from high to low. Hereinafter, this switching operation status will be explained in detail based on FIGS. 5 to 8.

[Low range]

First, when the change lever 135 is selected to position X as shown in FIG. 5fbl, each directional control valve 29.
30.99.100 is in the state shown in the same figure (al).

That is, in this state, the operating ball 47 of the first directional control valve 29 rides on the stepped portion 46 of the cam sleeve 32, and the operating plunger 79 pushes up the valve lifter 68. Further, the valve body 62 is connected to the tip 68b of the valve lifter 68.
is pushed up, closing the exhaust hole 72 of the valve lifter 68 and opening the valve seat hole 66 to enter the supply mode. Therefore, the compressed air in the near reservoir 59 is transferred from the pipe line 58 to the pressure supply port 60 to the valve seat hole 66 to the pulp lifter chamber 5.
5-Pressure discharge tube 77→Pipe line 81 is introduced into the low speed side cylinder chamber 93 of the actuator 8.

On the other hand, the operation ball 48 of the second directional control valve 30 is located in front of the inclined part 50 of the cam sleeve 32 and does not ride on the step part 46. Therefore, the operation plunger 80 and the valve lifter 69 are located in front of the inclined part 50 of the cam sleeve 32. As shown in the figure, the valve seat hole 67 is closed by the valve element 63, and the exhaust hole 73 of the valve lifter 69 is opened, thus being in the exhaust mode. Therefore, atmospheric pressure is introduced into the pulp lifter chamber 56 through the exhaust lower 4 and the exhaust hole 73.
This atmospheric pressure is introduced into the high-speed side cylinder chamber 92 of the actuator 8 via the pressure discharge lower 8-pipe line 82 path. Therefore, in this state, the piston 89 of the actuator 8 is moving to the low speed side (right side) as shown in FIG. 5 (al).

Further, at this time, the high-side stopper mechanism 37 is actuated and the low-side stopper mechanism 38 is released.

That is, at this time, the operation ball 118 of the third directional control valve 99 rides on the outer peripheral surface 132 of the cam sleeve 98, and the operation plunger 116 pushes up the valve lifter 107. Therefore, the valve body 101 is pushed up by the tip 107b of the valve lifter 107, and the valve body 101
The exhaust hole 111 of No. 7 is closed and the valve seat hole 105 is opened to enter the supply mode. Therefore, the compressed air in the near reservoir 59 is introduced into the pressure chamber 39 of the high-side stopper mechanism 37 through the path of pipe line 123 → valve seat hole 105 → pulp lifter chamber 124 - pressure outlet 126 - pipe line 128, and this pressure causes the stopper The piston 37b has moved forward and is pressed against the cushion ring 138.

On the other hand, the operating ball 119 of the fourth directional control valve 100 is fitted into the cam hole 133 of the cam sleeve 98, and the operating plunger 117 and pulp lifter 108 are
The valve seat hole 106 is closed by the valve body 102 and the valve lifter 10B is in the lowered state as shown in FIG.
The exhaust hole 112 is opened and the exhaust mode is set.

Therefore, atmospheric pressure is introduced into the pulp lifter chamber 125 through the exhaust port 114 and the exhaust hole 112, and this atmospheric pressure is introduced into the pressure chamber 40 of the low-side stopper mechanism 38 through the path of the pressure discharge port 127→pipe line 129. , the stopper piston 38b is in a free state.

[Low range to high range]

Next, when the change lever 135 is moved more than halfway from position X to position Y as shown in FIG.
99.100 is in the state shown in FIG. That is, in this state, the operating ball 48 of the second directional control valve 30
passes through the inclined portion 50 of the cam sleeve 32 and rides on the stepped portion 46, and the operating plunger 80 pushes up the valve lifter 69. Further, the valve body 63 is connected to the tip 69b of the valve lifter 69.
is pushed up, closing the exhaust hole 73 of the valve lifter 69 and opening the valve seat hole 67 to set the supply mode. Therefore, the compressed air in the near reservoir 59 is transferred to the pipe line 58-
The pressure is introduced into the high-speed side cylinder chamber 92 of the actuator 8 through the path of pressure supply port 6〇-passage 57-valve seat hole 67-pressure discharge lower 8-pipe line 82.

On the other hand, since the operation ball 47 of the first directional control valve 29 falls from the stepped portion 46 of the cam sleeve 32 to the lower side through the inclined portion 49, the valve lifter 68 and the operation plunger 7
9 is pressed down by the spring 70, the exhaust hole 72 of the valve lifter 68 is opened, and the valve seat hole 66 is opened to the valve body 6.
2 and enters exhaust mode.

Therefore, the compressed air in the low-speed side cylinder chamber 93 flows through the pipe line 81-
It is discharged to the outside through a path of pressure discharge port 77 - pulp lifter chamber 55 - exhaust hole 72 - exhaust port 75 .

For this reason, the piston 89 of the actuator 8 is
As shown in a), the sub-transmission 3 moves in the direction of arrow e, and the shift fork starts the switching operation of the sub-transmission 3 from low to high.

Further, at this time, both the high side stopper mechanism 37 and the low side stopper mechanism 38 operate as stoppers.

That is, at this time, the operation ball 118 of the third direction control valve 99 remains on the outer peripheral surface 132 of the cam sleeve 98, and the third direction control valve 99 is
remain in the same state. Therefore, the high side stopper mechanism 37
continues to operate the stopper.

On the other hand, since the operating ball 119 of the fourth directional control valve 100 rides on the outer peripheral surface 132 from the cam hole 133 of the cam sleeve 98, the operating plunger 117 moves to the valve lifter 108.
Push up. Therefore, the valve body 102 is connected to the valve lifter 108.
The valve lifter 1 is pushed up by the tip 108b of the valve lifter 1.
The exhaust hole 112 of 08 is closed and the valve seat hole 106 is opened to enter the supply mode. Therefore, the near reservoir 59
The compressed air flows through the pipe line 123 - passage 122 → valve seat hole 106 →
Valve lifter chamber 125 → pressure discharge port 127 - pipe line 129
The piston 38b is introduced into the pressure chamber 40 of the low-side stopper mechanism 38 through the path , and this pressure causes the stopper piston 38b to move forward and press against the kungjon ring 139. In this way, the high side stopper mechanism 37 and the low side stopper mechanism 38
When the respective stoppers are actuated, the movement of the valve operating shaft 28 in the direction of the arrow d in FIG. 6(a) is regulated by the stopper piston 37b.

(High range) When the actuator 8 completes its operation to the high side position as shown in FIG. 11B fits into the cam hole 133 of the cam sleeve 98, and the valve lifter 107 and the operating plunger 116
is pushed down by the spring 109 and the valve lifter 107
The exhaust hole 111 is opened, and the valve seat hole 105 is closed by the valve body 101 to enter the exhaust mode. Therefore, the compressed air in the pressure chamber 39 of the high side stopper mechanism 37 flows from the pipe line 128 to the pressure outlet 126 to the pulp lifter chamber 12.
It is discharged to the outside through the path of 4-tJl-stoma 111-exhaust port 113, and the high-side stopper mechanism 37 is released. As a result, the valve operating shaft 28 can be moved in the direction of arrow d as shown in FIG. 7, and the change lever 135 can be moved to position Y as shown in FIG. 7 (bl).

At this time, the first and second directional control valves 29°30
continues in the same state as in FIG. 6(a).

[High range to low range]

Next, when the change lever 135 is moved more than halfway from position Y to position X as shown in FIG.
99.100 is in the state shown in fal in the figure. That is, in this state, the operating ball 47 of the first directional control valve 29
passes through the inclined portion 49 of the cam sleeve 32 and rides on the stepped portion 46, and the operating plunger 79 pushes up the valve lifter 68. Further, the valve body 62 is connected to the tip 68b of the valve lifter 68.
is pushed up by the exhaust hole 72 of the valve lifter 68.
is closed, and the valve seat hole 66 is opened to set the supply mode.

Therefore, the compressed air in the near reservoir 59 is introduced into the low-speed side cylinder chamber 93 of the actuator 8 through the path of pipe line 58 - pressure supply port 60 - valve seat hole 66 - pressure discharge lower 7 - pipe line 81.

On the other hand, since the operation ball 48 of the second directional control valve 30 falls from the stepped portion 46 of the cam sleeve 32 to the lower side through the inclined portion 50, the valve lifter 69 and the operation plunger 8
0 is pushed down by the spring 71, the exhaust hole 73 of the valve lifter 69 is opened, and the valve seat hole 67 is opened to the valve body 6.
3 and enters exhaust mode.

Therefore, the compressed air in the high-speed side cylinder chamber 92 is transferred to the pipe line 82.
-Pressure outlet 78-Valve lifter chamber 56-Exhaust hole 73-
It is discharged to the outside through the exhaust ports 74 and 75.

Therefore, the piston 89 of the actuator 8 is
1 to move in the direction of arrow r, and a switching operation of the sub-transmission 3 from high to low is started.

At this time, the operation balls 118 and 119 of the third and fourth directional control valves 99 and 100 are riding on the outer peripheral surface of the cam sleeve 98, so the supply is performed in the same manner as in the case of the switching operation to the low range described above. mode.

Therefore, the high side stopper mechanism 37 and the low side stopper mechanism 38 are each operating as a stopper, and the valve operating shaft 28
In FIG. 8(a), movement in the direction of arrow C is restricted by the stopper piston 38b of the low-side stopper mechanism 38.

Next, when the actuator 8 completes its operation to the low side position as shown in FIG. It fits into the cam hole 133 of the cam sleeve 98 and becomes the exhaust mode again, and the low side stopper mechanism 3
8 is released from the stopper. As a result, the valve operating shaft 28 can be moved in the direction of arrow C as shown in FIG. 5, and the change lever 135 can be moved to position X as shown in FIG. 5(b).

At this time, the first and second directional control valves 29°30
maintains the same state as in FIG. 8 (8).

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can be modified in various ways.For example, in the above embodiment, one shift rod may be used as shown in FIG. By providing two yokes 16 and 17 on the shift lever 14, the shift lever 12 is engaged with the yoke 16 or 17 at two adjacent select positions, but the same effect can be obtained as shown in FIG. This can also be achieved by forming two tip portions 12b and 12c on the shift lever 12.

Further, in the above embodiment, the high side stopper mechanism 37 and the low side stopper mechanism 38 are connected to the cam sleeve 98 and the third and fourth
However, the stroke position of the piston rond, etc. of the actuator 8 is detected by a limit switch, etc., and the high side stopper mechanism is controlled based on the detection result. 37 and the low-side stiffener mechanism 38 may be controlled by electromagnetic valves.

Further, in the above embodiment, the high side stopper mechanism 37 and the low side stopper mechanism 38 are arranged at both ends of the valve operating shaft 28, but they can be placed at any position of the select link mechanism from the change lever 135 to the shift lever 12. In other words, as long as the stopper mechanisms 37 and 38 can appropriately restrict the selection operation of the change lever 135, the structure and arrangement position thereof can be modified in various ways as necessary.

Further, in the above embodiment, the first and second directional control valves 29
．． 30 to the high-speed side Schilling chamber 9 of the actuator 8
2 and the low-speed side cylinder chamber 93, one switching valve 142 is used instead of the first and second directional control valves 29 and 30 as shown in FIG. The switching valve 1 may be operated by a cam surface 144 formed on the shift lever 12.
42 is a four-point/two-position switching valve as shown in FIG. 10, and when the operation plunger 143 is pushed in, the pipe line 81 is connected to the near reservoir 59, and the pipe line 82 is communicated with the atmosphere. It has become. Also, the operating plunger 14
3 protrudes, the conduit 81 communicates with the atmosphere and the conduit 82 is connected to the near reservoir 59. In addition, in FIG. 9, the high side stopper mechanism 37 and the low side stopper mechanism 38 are arranged at both ends of the shift shaft 10,
The shift lever 12 is fixed to the shift shaft lO.

Further, in the above embodiment, the first and second directional control valves 29
．． Although the control valve 30 is constructed of a mechanically operated control valve, a control valve that is a combination of a switch and a solenoid valve may also be used. Figure 11~
FIG. 13 shows an example using such a control valve, and in FIG. 11, 146 is a select link rond, 147 is a shift link rond, 148 is a range change valve, and 149 is a rotating arm. . The rotating arm 149 is connected to the lever 24 of the operating device 6 and the camshaft 152 of the range change valve 148 by a link rod 150°.

A high-side stopper mechanism 37 and a low-side stopper mechanism 38 are provided at both ends of the camshaft 152. The high side switch 153 and the low side switch 154 are connected to the camshaft 15
It is turned ON and OFF by sliding 2. The switches 153 and 154 are connected to the high-side solenoid valve 155 and the low-side solenoid valve 156, and the switches 153,
154 Rondo 157.156 is pushed and switch 1
When 53 and 154 are turned on, solenoid valves 155 and 156 are excited and compressed air is supplied to pressure chambers 92 and 93 of actuator 8. Also Rondo 157
When the actuator 158 is projected and the switches 153 and 154 are turned off, the solenoid valves 155 and 156 are de-energized and compressed air is discharged from the pressure chambers 92 and 93 of the actuator 8 to the outside.

f. Effects of the Invention As described above, the present invention reliably prevents erroneous operation of the change lever since the change lever cannot be operated to the desired select position until the gear switching operation of the sub-transmission is completed. This completely eliminates the risk of unexpected damage to the gears of the sub-transmission. Furthermore, since the driver can notify the completion of gear change in the auxiliary transmission by the sensation of operating the change lever, there is no longer the hassle of checking the FLIl confirmation lamp every time the range is changed, which was the case in the past. , it is possible to realize ease and comfort of driving operation, and it is also possible to eliminate the need for devices such as confirmation lamps.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which FIG. 1 is a side view of the transmission, FIG. 2 is a longitudinal sectional view of the operating device of the main transmission, and FIGS. 3 (II) and (b). ) is a side view of the shift shaft, Fig. 4 is a schematic cross-sectional view of the transmission operating device, No. 51 m t
a) Cross-sectional view of the relay valve unit and actuator in the halo range, Part 5) is a plan view of the gear shift pattern at that time, and Figure 6 (a) is the relay valve when the range change from low to high starts. A cross-sectional view of the unit and actuator, Fig. 6) is a plan view of the gear shift pattern at that time, Fig. 7 (al
is a cross-sectional view of the relay valve unit and actuator in the high range, FIG. 7(b) is a plan view of the gear shift pattern at that time, and FIG. FIG. 8 is a cross-sectional view of the actuator (BL is a plan view of the gear shift pattern at that time, FIG. 9 is a longitudinal cross-sectional view of the main transmission operating device and actuator showing a modification of the present invention, and FIG. 10 is a vertical cross-sectional view of the actuator) Schematic diagram of the switching valve shown in Figure 11~
Fig. 13 shows another modification of the present invention, in which Fig. 11 is a plan view of the transmission, Fig. 12 is a plan view of the main transmission operating device, and Fig. 13 is a range change valve and a plan view of the main transmission. FIG. 3 is a longitudinal cross-sectional view of the actuator. ■...Transmission, 2...Main transmission, 3.
... Sub-transmission, 6... Operating device, 8...
Actuator, 10...Shift shaft, 12...
Shift levers 113 to 15...Shift rods, 23...
Select shaft, 25... Select arm, 27... Relay valve unit, 28... Valve operation shaft, 29... First directional control valve, 30... Second directional control valve, 32. ...Cam sleeve, 33...Fitting hole, 37...High side stopper mechanism, 38...Low side stopper mechanism, 46...Step part, 47
, 48... Operation ball, 49.50... Inclined part, 59... Near reservoir, 77, 78...
Pressure discharge port, 79.80... Operation plunger, 81... First pipe line, 82... Second pipe line, 92... High speed side cylinder chamber of actuator 8, 9
3...Low speed side cylinder chamber of actuator 8, 97.
...Stopper control means, 98...Cam sleeve, 9
9... Third direction control valve, 100... Fourth direction control valve, 133... Cam hole, 135... Change lever. Figure 9 jllZ diagram procedural amendment stamp button January 29, 1986 Director General of the Patent Office Hisashi Uga Michibe 1;
Indication of the case 1985 Patent Application No. 130982 2 Name of the invention Operating device for range change type transmission 3 Relationship to the case by the person making the amendment Patent applicant name Jidosha Mki Co., Ltd. (and 1 other person) 4. Agent 〒107 6. Contents of amendment Contents of amendment as attached + 11 Page 27, line 9 of the specification “Mouth/throat 157.1
56J is corrected as "Rondo 157.158J." (2) Figure 13 is corrected as shown in the attached sheet.

Claims (1)

[Claims] A main transmission consisting of a plurality of gear trains arranged in parallel, a gear type sub-transmission that switches the output of the main transmission to a high speed range or a low speed range, and a gear ratio of the main transmission. a plurality of shift rods arranged parallel to the axis of the gear train to select , a shift lever disposed on the shift shaft and rotatable together with the shift shaft, and at least two shifters mounted on the shift rod for receiving the tip of the shift lever and sliding the shift rod in the axial direction thereof. a main transmission transmission device having a shifter having a lever engagement surface; and a select arm that selectively moves the shift lever in the axial direction of the shift shaft in response to a select operation of the change lever; A sub-transmission transmission including a fluid pressure actuator for switching between range and low speed range; A range change type transmission comprising: (a) high/low range switching means that moves in response to select movement of the change lever; b) When the change lever is located at a lower speed range than a predetermined position due to the operation of the range switching means, working fluid is supplied to the low side pressure chamber of the actuator and working fluid is discharged from the high side pressure chamber. In addition, when the change lever is located on the high speed range side from a predetermined position, a high/low range change control is performed to supply working fluid to the high side pressure chamber of the actuator and to discharge working fluid from the low side pressure chamber. (c) When the change lever reaches an appropriate select position between the predetermined position and a position where the lowest gear shift of the high speed range is possible, preventing the change lever from moving toward the high speed range. (d) When the change lever comes to an appropriate selection position between the predetermined position and the highest gear shifting position in the low speed range, the change lever is moved to the low speed range side. (e) When the fluid pressure actuator is in operation, the high-side stopper mechanism and the low-side stopper mechanism are actuated to stop the fluid pressure actuator from moving to the high side or An operating device for a range change type transmission, comprising: stopper control means for releasing the high-side stopper mechanism or the low-side stopper mechanism when the operation to the low side position is completed;