JPS622178B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speed change operation device used in a range shift type transmission of a vehicle, particularly an automobile.

Conventionally, multi-stage transmissions used in automobiles consist of a main transmission and a sub-transmission, and are particularly designed to be compact and quick to change gears, such as a range shift type. There is a transmission.

This type of transmission is structurally equipped with a gear shift operation device that prevents shifting errors electrically-mechanically or fluidly-mechanically and that enables quick gear shifting operations. In addition, the shift operation device is required to have easier shift operation and higher reliability of shift operation, that is, higher reliability of shift operation. In particular, conventional high-speed operating devices of this type tend to have complicated structures in order to improve the reliability of gear shifting operations.

For example, Japanese Patent Application No. 53-25722 entitled ``Shift Control Device for Range Shift Type Transmission'' is an example of a speed change operating device for this type of transmission.

This shift control device is a lock that connects the neutral air lock unit installed in the double engagement prevention mechanism of the main transmission, the operating cylinder of the neutral air lock unit, and the air pressure source. A locking solenoid valve installed in the pneumatic piping, an air shift unit installed in the range transmission, and a high-speed valve that connects the high-speed side cylinder chamber of the operating cylinder of the air shift unit and the air pressure source. a solenoid valve for high-speed shift provided in the pneumatic piping for the air shift unit, and a solenoid valve for low-speed shift provided in the low-speed pneumatic piping that connects the low-speed cylinder chamber of the operating cylinder of the air shift unit and the air pressure source. and a power circuit to operate those solenoid valves,
Range transmission shift completion detection comprising high-speed side and low-speed side normally closed relays that respond to the shift operation of the air shift unit, and connecting the output sides of these relays to the electric circuit of the locking solenoid valve. a shift solenoid valve switching circuit that switches and connects the electric circuits of the high-speed side and low-speed side shift solenoid valves to the power supply circuit; and a lock solenoid valve switching circuit that switches and connects the input side of the low-speed normally closed relay to the power supply circuit, and the input side of the shift solenoid valve switching circuit of the switch. and a neutral position detector connected in series between the gear shift hand lever and the power supply circuit and responsive to the neutral position of the gear shift hand lever. Operate the control switch to range shift the air shift unit from low speed to high speed or from high speed to low speed to change the range.
A shift fork disposed in the transmission had to be shifted, and the range shift operation was performed separately from the gear shift hand lever operation, which was complicated.

The purpose and problem of this invention is to make gear shifting operations easy and simple without depending on the driver's advanced operating skills, to enable quick gear shifting operations, and to shift gears with high reliability. A range shift type transmission that enables easy operation, prevents gear shifting errors, prevents damage to the synchronous meshing mechanism, prevents troubles that interfere with vehicle operation, and also simplifies the structure. The purpose of the present invention is to provide a speed change operation device used in a transmission.

In order to solve these problems, the gear shift operation device used in the range shift type transmission of the present invention has a plurality of main transmission gear shift shafts disposed in the main transmission, and the main transmission gear shift shaft. - A plurality of main transmission gear shift forks held in the transmission gear shift shaft and the main transmission gears in response to gear shift hand lever operation. - A main shift lever having two shift levers projecting at predetermined intervals in the length direction to selectively shift the plurality of main transmission gear shift forks along with the shift shaft. A transmission shift and select shaft, low-speed and high-speed range switching stages formed on the main transmission shift and select shaft, and a low-speed and high-speed range switching stage located on the sub-transmission. Sub-transmission gear shift fork and its sub-transmission gear shift
A fluid pressure actuator for shifting the shift fork, and a fluid pressure piping connecting the fluid pressure actuator to a fluid pressure source, and the main transmission shift and
A directional valve that is switched between the low-speed and high-speed range switching stages in response to the movement of the select shaft, and a directional valve that connects the fluid pressure actuator to the fluid pressure source upstream of the directional valve. A fluid pressure cutoff valve that is disposed in the fluid pressure piping and cuts off fluid pressure supplied from the fluid pressure source to the fluid pressure actuator, and in the axial direction of the main transmission shift and select shaft, spaced apart from the directional valve and the main transmission shift and
Positioned in the neutral position of the select shaft, the tip is constantly pressed against the outer circumferential surface of the main transmission shift and select shaft by a plunger spring, and opens and closes the fluid pressure cutoff valve. associated with the plunger and the valve opening/closing plunger, the main transmission shift and select shaft being appropriately spaced from the lower range gearing stage in the axial direction of the main transmission shift and select shaft; The main transmission shift and select shaft is located on the outer circumference of the main transmission shift and select shaft in the neutral position of the transmission shift and select shaft.
When the select shaft is extended and opened in the lengthwise direction, and the main transmission shift and select shaft is in the neutral position, the tip of the valve opening/closing plunger is received, and the valve is inserted into the valve opening/closing plunger. The main transmission shift and select shaft is operated by operating the gear shift hand lever, and the sub transmission has a cam groove that provides opening/closing operation. It range-shifts from high speed to high speed, and from high speed to low speed, and then changes the gear mesh in the main transmission to change gears.

Hereinafter, preferred specific examples of the speed change operating device used in the range shift type transmission according to the present invention will be described with reference to the drawings.

Figures 1 to 4 show a preferred embodiment 10 of the speed change operating device of the present invention applied to a range shift type transmission of a tail cab type truck equipped with a main transmission and a sub-transmission. There is.

The speed change operating device 10 is configured to be suitable for a range shift type transmission with nine forward speeds and one reverse speed, and has a plurality of main transmission gear shift shafts 11, 1.
2, 13, a plurality of main transmission gear shift forks (not shown), a plurality of shift heads 14, 15, 16, and selectively connected to the shift heads 14, 15, 16. A main transmission shift and select shaft 17 with two geared shift levers 18, 19, low-speed and high-speed range switching stages 20, 21, and a sub-transmission. Placed sub-transmission
gear shift fork 22, a hydraulic or pneumatic source (not shown), and a hydraulic actuator, or pneumatic source, for its sub-transmission gear shift fork 22;
a cylinder 23, a directional control valve 24 disposed in the hydraulic line of the air cylinder 23, that is, a pneumatic line 28, a hydraulic cutoff valve 25 disposed in the pneumatic line 28, and a hydraulic cutoff valve thereof; That is, a valve opening/closing plunger 26 for the pneumatic shutoff valve 25 and a longitudinally extending valve opening/closing plunger 26 for the valve opening/closing plunger 26 for the main transmission shift.
The cam groove 27 formed in the gear shift and select shaft 17, the cab shift hand lever (not shown), and the gear shift hand lever are connected to the main transmission shift and select. - a control rod (not shown) that is continuous with the shaft 17;

Its main transmission gear shift shafts 11, 12, 13 are for reverse and very low speeds, for 1st and 2nd gears - 5th and 6th gears, and for 3rd and 4th gears. 7th and 8th speeds, located on the case cover (not shown) of the main transmission.

A plurality of main transmission gear shift forks are connected to corresponding main transmission gear shift shafts 11, 12, 13 within the main transmission case (not shown). The coupling sleeve held on the main shaft spline is slid, and the main shaft gear which idles on the main shaft is meshed with the main shaft, so that power can be transmitted to the sub-transmission side.

The plurality of shift heads 14, 15, 16 are connected to the main transmission gear shift head.
For the fork, in a predetermined position it is fixed to its main transmission gear shift shaft 11, 12, 13, allowing the tips of the shift levers 18, 19 to engage, the shift levers 18, The movement of 19 allows the main transmission gear shift fork to be shifted via the main transmission gear shift shafts 11, 12, 13.

The shift heads 14, 15, 16 have a pair of protruding corners 35, 36 at appropriate intervals to receive the tips of the shift levers 18, 19.
A yoke portion 34 is provided. It is of course also possible for one of the shift heads 14, 15, 16 to be integrally formed on the top of the corresponding main transmission gear shift fork.

The main transmission shift and select shaft 17 is located in a control box 70 formed in the case cover of the main transmission, and the control rod, shift and select shaft assembly (not shown), gear shift
It is connected to a gear shift hand lever (not shown) via a hand lever housing (not shown) or the like.

The main transmission shift and select shaft 17 includes two shift levers 18 and 19 that project at a predetermined distance in the length direction, and the gear shift hand. In response to lever operation, the main transmission gear shift shafts 11, 12, and 13 as well as the plurality of main transmission gear shift shafts 11, 12, and 13
The transmission gear shift fork can be selectively shifted.

The shift levers 18, 19 are spaced apart by a distance L, such that one shift lever 18 is used for the first and second gears - the fifth and sixth gears, as shown in FIG. Main transmission gear shift shaft 12 shift for high speed
The distance 1 between the shift head 14 of the main transmission gear shift shaft 11 for reverse and very low speeds and the other shift lever 19 when engaged with the shift lever 15, or the third
for 7th and 4th gears - twice the distance l between the shift head 16 of the main transmission gear shift shaft 13 and one of the shift levers 18 for 7th and 8th gears. .

Further, in this transmission operating device 10, the distance between the shift heads 15 and 16 is matched to the distance l between the shift head 16 and the shift lever 18.

Low speed side and high speed side range switching stage 20, 21
As can be understood from FIG.
Depending on the movement of the shaft 17, the directional control valve 2
4 is switched to enable operation.

The sub-transmission gear shift fork 22 is disposed within the case of the sub-transmission, and range-shifts from low speed to high speed and from high speed to low speed, and shifts the gear of the sub-transmission. This makes it possible to change the mesh of the parts. Of course, the sub-transmission gear shift fork 22 is the air cylinder 2.
It is fixed to the operating rod 39 of No. 3 and range-shifted by its air cylinder 23.

The air cylinder 23 includes a cylinder 37 formed in the case cover 69 of the sub-transmission, a piston 38 fitted into the cylinder 37 so as to be able to reciprocate and slide, and the piston 3.
It consists of an operating rod 39 with one end fixed to 8,
The low-speed side and high-speed side cylinder chambers 40, 41 of the cylinder 37 are connected to an air pressure source, ie, an air tank, via a pneumatic pipe 28.

To be more specific, the air cylinder 2
3 connects the low-speed side and high-speed side pneumatic piping portions 67 and 68 of the pneumatic piping 28 branched by the directional switching valve 24 to the low-speed side and high-speed side cylinder chambers 4.
0 and 41 through connectors 42 and 43, respectively, to enable the sub-transmission gear shift fork 22 to range shift.

The directional valve 24 is located on the main transmission case cover in line with the control box 70 and is configured to move in response to movement of the main transmission shift and select shaft 17. Main transmission shift and select shaft 17 low speed and high speed range switching stage 2
0 and 21, the valve is switched.

The directional valve 24 is incorporated into a valve housing block 44 that shares a pneumatic isolation valve 25.

That is, the directional valve 24 is a valve.
Bore 45 into its valve housing block 4
4, an inlet 46 and low-speed and high-speed side outlets 47, 48 are formed in the valve bore 45, and a spool 4 is formed in the valve bore 45.
9 are arranged to be able to slide back and forth.

The spool 49 further includes a push rod 50 at one end.
The tip of the valve spring 52 is constantly pressed against the transmission shift and select shaft 17 through the opening 51, that is, against the low-speed and high-speed range switching stages 20, 21.

The directional valve 24 also connects the inlet 46 to the pneumatic isolation valve 2 through a communication passage 53 formed in the valve housing block 44.
5, and the low-speed and high-speed side outlets 47, 48 are connected to the low-speed and high-speed side pneumatic piping sections 67, 68, respectively, via connectors 54, 55.

Upstream of the directional valve 24, the pneumatic isolation valve 25 connects the pneumatic line 2 connecting the air cylinder 23 to the air tank.
8, specifically, its pneumatic piping 28
and the valve housing block 4
disposed in communication passages 53, 62 formed in 4,
The compressed air supplied from the air tank to the air cylinder 23 is cut off. The pneumatic isolation valve 25, as seen in FIG. , a poppet 58 is disposed in the valve bore 56 and a valve spring 59 constantly presses the poppet 58 against the valve seat 57.

Further, the pneumatic cutoff valve 25 has a poppet 58 whose tip protrudes into a plunger bore 65, and which engages with a notch 64 of a valve opening/closing plunger 26 fitted into the plunger bore 65 so as to be able to reciprocate and slide. I'm letting you do it.

Further, the pneumatic isolation valve 25 connects the inlet 60 to the air tank via a communication passage 62 formed in the valve housing block 44, a connector 63 and a pneumatic line 28, and
As described above, the outlet 61 is connected to the inlet 46 of the directional control valve 24 via the communication passage 53.

The valve opening/closing plunger 26 has a notch 6 for the poppet 58 of the pneumatic shutoff valve 25.
4, located at an appropriate distance from the directional control valve 24 in the axial direction of the main transmission shift and select shaft 17, and Select shaft 1
7 is reciprocally slidably fitted into a plunger bore 65 formed in its valve housing block 44 corresponding to the neutral position of its main transmission shifter.
The shift and select shaft 17 is located at its neutral position, and the plunger spring 66 always presses the tip against the outer circumferential surface of the main transmission shift and select shaft 17 to close the pneumatic cutoff valve 25. Operate opening and closing. Of course, this valve opening/closing plunger 26
The tip of the plunger is pressed so that it is always pressed against the outer circumferential surface of the main transmission shift and select shaft 17, which forms a cam groove 27 that will be described in detail later.
A tendency to project outward of the bore 65 is provided by its plunger spring 66.

Therefore, only when the main transmission shift and select shaft 17 is in the neutral position, the valve opening/closing plunger 26 is moved into the cam groove 27 by the plunger spring 66.
The tip of the valve opening/closing plunger 26 engages with the cam groove 27, and as the valve opening/closing plunger 26 moves,
As shown in FIG. 1, the relative positions of the tip of the poppet 58 of the pneumatic shutoff valve 25 and the notch 64 of the valve opening/closing plunger 26 are misaligned, and the poppet 58 is aligned with the valve seat 57 of the valve bore 56.
Open the air cylinder 23 from the air tank.
According to the position of the directional switching valve 24, the gear shift fork 22 of the sub-transmission is shifted from the low speed side to the high speed side, and
Enables range shifting from high speed to low speed.

The cam groove 27 is connected to the main transmission shift gear in conjunction with the valve opening/closing plunger 26, as shown in FIGS.
The main transmission shift and select shaft 1 is located at an appropriate distance from the low speed range switching stage 20 in the axial direction of the shift and select shaft 17.
Its main transmission shift and select shaft 1 in the neutral position of 7
The main transmission is located on the outer peripheral surface of 7.
The shift and select shaft 17 is extended in the length direction and opened to receive the tip of the valve opening/closing plunger 26 when the main transmission shift and select shaft 17 is in the neutral position. , gives the valve opening/closing action to the valve opening/closing plunger 26. That is, this cam groove 27 receives the tip of the valve opening/closing plunger 26 only when the main transmission shift and select shaft 17 is in the neutral position, and
When the main transmission shift and select shaft 17 is in either the shift or select position, the tip of the valve opening/closing plunger 26 is connected to the main transmission shift and select shaft 1.
7, the valve opening/closing plunger 26 is slid back and forth into the plunger bore 65, and the pneumatic cutoff valve 25 is opened and closed.

Further, the transmission operating device 10 forms low speed and high speed range select sensing stages 29, 30 on its main transmission shift and select shaft 17, as shown in FIG. A steel ball 32 is placed in a hole 31 drilled in the control box 70, and a spring 33 moves the steel ball 32 in response to the shift operation of the main transmission shift and select shaft 17.
Its low speed and high speed range select sensing stage 2
9 and 30 to give the driver a feeling of selecting the gear shift operating device 10 from a low speed range to a high speed range, from a high speed range to a low speed range, and furthermore, to select reverse and ultra-low speeds. At the same time, the driver is provided with selection positions of first and second speeds, fifth and sixth speeds, third and fourth speeds, seventh speeds and eighth speeds.

Also, the gear shift hand lever, control rod, etc. are constructed as usual and placed in predetermined positions.

Next, the operation of the shift operating device 10 of the present invention configured as described above will be explained.

Now, let's talk about the case where the sub-transmission is range-shifted from the low-speed range to the high-speed range, and then the gears of the main transmission are changed to change gears. In the state shown in the figure, the directional control valve 24 5
0 is located at the low speed range switching stage 20 of the main transmission shift and select shaft 17, and the directional control valve 24
The spool 49 connects the inlet 46 to the low speed outlet 4.
7, the valve opening/closing plunger 26 engages with the cam groove 27, the pneumatic cutoff valve 25 is opened, and the compressed air is transferred from the air tank to the low speed side cylinder chamber 40 of the air cylinder 23. The gear shift fork 20 of the sub-transmission is shifted into the low speed range, with the shift lever 1
8 is engaged with the shift head 15 for the first and second gears, so that the main transmission shift and select shaft 1
7 is rotated as shown in FIG. 3, the gear shift fork of the main transmission gear shift shaft 12 is shifted to first or second gear.

Next, if the main transmission shift and select shaft 17 is placed in the neutral position and moved a distance l to the left in FIG.
The tip of the main transmission shift
The directional switching valve 24 of the low speed range switching stage 20 of the and select shaft 17
is in an open state connecting the inlet 46 to the low speed side outlet 47, and the valve opening/closing plunger 26 is in a state engaged with the cam groove 27,
The pneumatic isolation valve 25 is in the open state and therefore the sub-transmission gear
Since the shift fork 20 is in the low speed range and the shift lever 18 is engaged with the third and fourth gear shift heads 16, as shown in FIG. If the main transmission shift and select shaft 17 is rotated, the gear shift fork of the main transmission gear shift shaft 13 is shifted to third or fourth gear. Ru.

Furthermore, with the main transmission shift and select shaft 17 in the neutral position as shown, move it a distance l to the left in FIG.
If the push rod 50 of the directional valve 24 is moved by
The directional switching valve 24 is connected to the inlet 46 by a spool 49.
The valve opening/closing plunger 26 engages with the cam groove 27 to open the pneumatic cutoff valve 25, and the compressed air enters the high speed side cylinder chamber 41 of the air cylinder 23. It is supplied from the tank via the high-speed side pneumatic piping section 68, and is supplied to the sub-transmission gear shift.
When the fork 22 is range shifted from low to high speed, the shift lever 18 is disengaged from the third and fourth gear shift heads 16 and the shift lever 18 is disengaged from the third and fourth gear shift heads 16.
The lever 19 is engaged with the first and second gear shift heads, that is, the fifth and sixth gear shift heads 15, so that the main transmission shift and select shaft 17 is engaged. When rotating as shown in FIG. 3, the gear shift fork of main transmission gear shift shaft 12 is shifted to fifth or sixth gear.

Next, if the main transmission gear shift and select shaft 17 is placed in the neutral position and moved a distance l to the left in FIG. The tip is the main transmission
In the high-speed range switching stage 21 of the shift and select shaft 17, the directional valve 24 is in an open state connecting the inlet 46 to the high-speed outlet 48, and the valve opening/closing plunger 26 is in an open state. is engaged with the cam groove 27, its pneumatic cutoff valve 25 is open, and therefore the gear shift fork 20 of the sub-transmission is shifted to the high speed range. In addition, the shift lever 19 is connected to the shift head 1 for the 3rd and 4th speeds, that is, the shift head 1 for the 7th and 8th speeds.
6, so the main transmission shift and select is engaged again.
If shaft 17 is rotated as shown in FIG. 3, the gear shift fork of main transmission gear shift shaft 13 will be shifted to seventh or eighth gear.

Also, if the main transmission shift and select shaft 17 is moved a distance l to the right from the position shown in FIG.
The tip of the main transmission shift
The directional switching valve 24 of the low speed range switching stage 20 of the and select shaft 17
is in an open state where the inlet 46 is connected to the low speed side outlet 47, and the valve opening/closing plunger 26 is in a state engaged with the cam groove 27,
The pneumatic isolation valve 25 is in the open state and therefore the sub-transmission gear
When the shift fork 20 is shifted to the low speed range, the shift lever 18 is disengaged from the shift head 15, while the shift lever 19 is disengaged from the reverse and very low speed shift head 1.
4, so if the main transmission shift and select shaft 17 is rotated as shown in FIG. The gear shift fork is shifted into reverse or very low speed.

As described above, the range shift type transmission can easily and reliably change gears by operating the gear shift hand lever.

According to the above invention, the low speed side and high speed side range switching stages formed on the main transmission shift and select shaft and the fluid pressure actuator are arranged in the fluid pressure piping connecting to the fluid pressure source. and a directional valve that is operated at the low-speed and high-speed range switching stages according to the movement of the main transmission shift and select shaft, and on the upstream side of the directional valve. , a fluid pressure isolation valve disposed in the fluid pressure piping connecting the fluid pressure actuator to the fluid pressure source for isolating fluid pressure supplied to the fluid pressure actuator from the fluid pressure source; located at a suitable distance from the directional valve in the axial direction of the main transmission shift and select shaft and in a neutral position of the main transmission shift and select shaft; A valve opening/closing plunger whose tip is constantly pressed against the outer circumferential surface of the main transmission shift and select shaft by a plunger spring, and which opens and closes the fluid pressure cutoff valve; , its main transmission shift and select
The main transmission shift and select shaft is located at a suitable distance from the low-speed range changeover stage in the axial direction of the shaft, and is in the neutral position of the main transmission shift and select shaft.・An opening is formed on the outer circumferential surface of the select shaft that extends in the length direction of the main transmission shift and select shaft, and the main transmission shift and select shaft is in the neutral position. The valve opening/closing plunger is equipped with a cam groove that receives the tip of the valve opening/closing plunger and allows the valve opening/closing operation to be performed when the gear shift hand lever is operated. The and select shaft is moved, and the sub-transmission range-shifts from low to high speed and from high to low, and then the main transmission changes gear engagement. In this way, the gear shifting operation is very easy and does not depend on the driver's advanced operating skills.
It also makes it easier and faster to shift gears, and it also allows for more reliable gear shifting operations, which prevents shifting errors and prevents damage to the synchronized mesh mechanism, making it easier to operate the vehicle. In addition, solenoid valves, electrical detectors, electrical switching devices, etc. are omitted, simplifying the structure, and the equipment is resistant to mechanical vibrations, making the equipment more durable. The durability of the equipment has been improved, which in turn extends the life of the equipment and the range of the vehicle.
It becomes very useful and practical for shift type transmissions.

[Brief explanation of the drawing]

FIG. 1 is a partial longitudinal cross-sectional view of the speed change operating device of the present invention applied to a range shift type transmission comprising a main transmission and a sub-transmission, and FIG. FIG. 3 is a cross-sectional view taken along line 3--3 in FIG. 1, and FIG. 4-4 in Figure 1
FIG. 3 is a cross-sectional view taken along the line. 10... Speed change operation device, 11, 12, 13...
Main transmission gear shift shaft, 14, 15, 16...shift head,
17...Main transmission shift
and select shaft, 18, 19...Shift lever, 20, 21...Low speed side and high speed side range switching stage, 22...Sub transmission gear shift fork, 23...Air cylinder , 24... Directional switching valve, 25...
...Pneumatic cutoff valve, 26...Valve opening/closing plunger, 27...Cam groove, 28...Pneumatic piping, 2
9, 30...Low speed and high speed range select sensing stage, 32...Steel ball, 33...Spring.

Claims (1)

[Claims] 1. A plurality of main transmission gear shift shafts arranged in a main transmission, and a plurality of main transmission gear shift shafts held by the main transmission gear shift shafts.・A transmission gear shift fork and its main transmission gear shift shaft and its plurality of main transmission gears in response to gear shift hand lever operation. a main transmission shift and select shaft having two shift levers projecting longitudinally at predetermined intervals to selectively shift the shift forks; Low-speed and high-speed range switching stages formed on the transmission shift and select shaft, and sub-transmission stages located on the sub-transmission.
a transmission gear shift fork, a fluid pressure actuator for shifting the sub-transmission gear shift fork, and a fluid pressure piping that connects the fluid pressure actuator to a fluid pressure source; And its main transmission shift and select
A directional valve that is switched between the low-speed and high-speed range switching stages in response to the movement of the shaft, and a fluid pressure that connects the fluid pressure actuator to the fluid pressure source upstream of the directional valve. a fluid pressure shutoff valve disposed in the piping to shut off fluid pressure supplied from the fluid pressure source to the fluid pressure actuator, and in the axial direction of the main transmission shift and select shaft;
spaced apart from the directional valve, and the main transmission shift
Positioned in the neutral position of the shift and select shaft, the tip is constantly pressed against the outer circumferential surface of the main transmission shift and select shaft by a plunger spring, opening and closing the hydraulic shutoff valve. a valve opening/closing plunger; and, in connection with the valve opening/closing plunger, the valve opening/closing plunger, associated with the valve opening/closing plunger, located at a suitable distance from the lower range gearing stage in the axial direction of the main transmission shift and select shaft; Main transmission shift
The main transmission is located on the outer circumference of the shift and select shaft in its neutral position.
The transmission shift and select shaft is extended and opened in the length direction,
When its main transmission shift and select shaft is in the neutral position,
A speed change operating device used in a range shift type transmission, which includes a cam groove that receives the tip of the valve opening/closing plunger and provides the valve opening/closing operation to the valve opening/closing plunger.