JP3505776B2 - transmission - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission, and more particularly to a transmission in which the size in the length direction is shortened, the reverse shift mechanism is simplified, and the reverse synchronous switching mechanism can be easily attached. Regarding

[0002]

2. Description of the Related Art A vehicle is equipped with a manual or automatic transmission in order to convert the power of an internal combustion engine into a desired one in accordance with a driving condition and take it out. Such transmissions include gear type transmissions and belt type transmissions, and gear type transmissions with low power transmission loss are often used.

As a gear type transmission, there is one shown in FIGS. That is, in FIG. 6, reference numeral 202 denotes a front engine front drive vehicle (FF vehicle) transmission, 204
Is a gear unit, 206 is a differential unit, and 208 is a transmission case. In the transmission case 208, a main shaft 210, which is an input shaft where a driving force from an internal combustion engine (not shown) is intermittently connected by a clutch (not shown), and a counter shaft 21.
2 and the reverse idler shaft 214 are sequentially arranged in the entire length direction (longitudinal direction) of the transmission 202 and substantially parallel to each other.

The main shaft 210 is held by the first main shaft bearing 220 held by the right wall portion 218 of the right case 216 of the transmission case 208 and the left wall portion 224 of the left case 222 of the transmission case 208. It is rotatably supported by the second main shaft bearing 226.

The counter shaft 212 is disposed on the side of the small differential unit 206, and is held by the first counter shaft bearing 228 held by the right wall part 218 of the right case 216 and the left wall part 224 of the left case 222. It is rotatably supported by the second counter shaft bearing 230.

The reverse idler shaft 214 has a differential section 20.
6 and the right wall 218 and the left wall 22 at positions away from
It is rotatably supported by 4 and.

The main shaft 210 is provided with a plurality of stages of respective main speed gears sequentially from the internal combustion engine side to the first speed main gear 2
32, reverse main gear 234, and second speed main gear 23
6 is fixedly provided, the third speed main gear 238, the fourth speed main gear 240, and the transmission case 208.
In the side case 242 of the fifth speed main gear 244
And are rotatably provided.

A final drive gear 248 which constitutes a final reduction mechanism 246 is fixedly provided on the counter shaft 212 sequentially from the internal combustion engine side as a plurality of counter speed gears, and a first speed main gear 232. Is rotatably provided, a second speed counter gear 252 that meshes with a second speed main gear 236 is rotatably provided, and a third speed main gear 238 that meshes with a third speed counter gear 238. A fourth speed counter gear 256 that meshes with the fourth speed main gear 240 and a fifth speed counter gear 258 that meshes with the fifth speed main gear 244 are fixedly provided in the side case 242.

The reverse idler shaft 214 has a reverse idler gear 2 which is meshable with a reverse main gear 234.
60 is provided integrally with the reverse sleeve 262.

The counter shaft 212 between the first speed counter gear 250 and the second speed counter gear 252 has a first speed / second speed synchronous switch having a first speed / second speed sleeve 264 and a reverse counter gear 266 integrally formed. A mechanism 268 is provided. The reverse idler gear 260 is meshed with the reverse counter gear 266.

Third speed main gear 238 and fourth speed main gear 2
On the main shaft 210 between 40, a 3rd / 4th speed synchronous switching mechanism 272 having a 3rd / 4th speed sleeve 270 is provided.

On the main shaft 210 close to the fifth speed main gear 244, a fifth speed synchronous switching mechanism 276 having a fifth speed sleeve 274 is provided.

A final driven gear 278 is provided in mesh with the final drive gear 248 of the counter shaft 212. This final driven gear 2
The gear 78 is fixed to the differential case 280 of the differential portion 6 by a gear mounting bolt 282. This differential case 278
Inside, a differential pinion shaft 284 fixed to the differential case 280 and differential pinion gears 286-1 and 286-2 provided at both ends of the differential pinion shaft 284.
And the left and right diff side gears 288-1 and 28, which are meshed with the diff pinion gears 286-1 and 286-2, respectively.
8-2 and 8-2 are provided.

In the differential case 280, the one side case bearing 294 in which the outer peripheral surface of the shaft holding section 290-1 on the left side is held by the left supporting section 292 of the left case 222.
Is rotatably supported by the shaft holder 290-2 on the right side, and the outer peripheral surface of the shaft holder 290-2 on the right side is rotatably supported by the other-side case bearing 298 held by the light support 296 of the light case 216.

The differential side gears 288-1, 288-
2 is a gear side spline hole 3 in which a spline is formed.
00-1 and 300-2 are formed.

The shaft holding portion 290 of the differential case 280 is also included.
1, 290-2 includes the gear side spline hole 300.
-1,300-2 communicating with shaft holding holes 302-1,30-2
2-2 is formed.

The gear side spline holes 300-1 and 30
Left and right axle shafts (not shown) are connected to 0-2 and the shaft holding holes 302-1 and 302-2.

According to this transmission 202, during reverse operation, the driving force of the internal combustion engine is transmitted from the reverse main gear 234 on the main shaft 210 to the reverse idler gear 260, and then through the reverse counter gear 266, the counter shaft 212. To the final drive gear 24
Rotate 8.

Further, as such a gear type transmission, for example, Japanese Patent Application Laid-Open Nos. 61-21451 and 6 are known.
It is disclosed in Japanese Patent No. 1-21452 and Japanese Utility Model Laid-Open No. 5-12807. The one disclosed in Japanese Patent Laid-Open No. 61-21451 is connected to a reverse drive gear provided on a main shaft, a reverse driven gear provided on a counter shaft, and an idle gear having a two-stage gear structure for reduction, and the idle gear is connected to the idle gear. A shifter that engages and disengages the reverse driven gear and the counter shaft is provided within one of the gear widths of the gear, which allows the idle gear to have a two-stage configuration, the reduction ratio to be set to an arbitrarily large value, and the gear to have two stages. With the configuration, it is possible to reduce the distance between the shafts while increasing the reduction ratio, so that it is possible to achieve compactness, and also to provide a shifter within one gear width to bring the gear and the shifter closer to each other, and effectively use the space outside the shifter. It is possible to further reduce the size of the entire mission for shortening the axis-to-axis. Japanese Patent Laid-Open No. 61-214
In the one disclosed in Japanese Patent No. 52, a common drive gear for the first speed and reverse is integrally provided on the main shaft, and the reduction ratio is close.
That is, a driven gear for the first speed and reverse having a large diameter and a similar diameter is provided adjacent to the counter shaft, and one is driven directly by the drive gear and the other is driven through the idle gear.
First, gears with similar diameters are concentrated in a predetermined part of the transmission, and this part of the reduction gear case can be enlarged.
The other parts are smaller, which makes the entire transmission compact. In Japanese Utility Model Laid-Open No. 5-12807, a reverse idler gear is used as a first reverse idler gear that constantly meshes with a reverse gear on the input shaft side and a second reverse idler gear that constantly meshes with a reverse gear on the output shaft side. The total length is shortened by splitting and providing the reverse gear synchromesh mechanism that connects and disconnects these first and second reverse idler gears, while also using this input reverse gear as the first forward gear It is intended to

[0020]

By the way, when the vehicle is a front engine front drive vehicle (FF vehicle), it is desirable that the size of the transmission in the entire length direction is short in view of installation of the engine.

However, in a conventional FF vehicle transmission, since the reverse shift mechanism including parts such as a reverse idler shaft is arranged side by side in the entire length direction of the vehicle, the dimension of the transmission in the entire length direction is long. As a result, the overall width of the vehicle is affected, and it becomes impossible to construct a 6-speed transmission within the width of the 5-speed transmission.
The reverse shift mechanism becomes complicated, and further, the processing of the transmission case becomes complicated, resulting in a high cost.

Further, due to its structure, there is a disadvantage that the installation of the reverse synchronization switching mechanism to the reverse idler gear becomes complicated.

[0023]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention firstly arranges a main shaft, a counter shaft, and a reverse idler shaft in a transmission case in substantially parallel to each other. A plurality of main speed gears are provided on the main shaft, a plurality of counter speed gears are provided on the counter shaft corresponding to the main speed gears, and a final drive gear is provided on the counter shaft. A transmission provided with a final driven gear that is meshed with a final drive gear and fixed to a differential case of a differential section, wherein the reverse idler shaft is arranged on the differential section side and is axially supported by the transmission case. The reverse idler shaft is meshed with the first speed counter gear of the counter shaft.
Reverse idler gear
Reverse final gear meshed with the null driven gear
Is provided to prevent the internal combustion engine from operating during reverse operation of the shift lever.
The driving force is from the 1st speed main gear of the main shaft to the 1st speed
It is transmitted to the reverse idler gear through the counter gear.
The reverse synchronization switching mechanism is the reverse idler gear.
By connecting the reverse idler shaft and
Reverse reverse gear from the reverse idler shaft
After that, it is transmitted to the final driven gear,
It is characterized by rotating the null driven gear .

Secondly, the main shaft, the counter shaft, and the reverse idler shaft are arranged substantially in parallel in the transmission case, the main shaft is provided with a plurality of main speed gears, and the counter shaft is provided with the main speed gears. A final driven gear which is provided with a plurality of counter speed gears corresponding to the main speed gears, a final drive gear is provided on the counter shaft, and which is meshed with the final drive gear and fixed to the differential case of the differential section. In the transmission provided with, the reverse idler shaft is disposed on the differential portion side and is pivotally supported by the transmission case, and the reverse idler shaft is meshed with the counter lowest speed gear of the counter shaft. A reverse idler gear is provided and one end of the reverse idler shaft is connected to the reverse idler gear during reverse operation. Provided a reverse synchronous switching mechanism to continue, said the other end of the reverse idler shaft is provided a reverse final gear which is meshed with the final driven gear, when the reverse operation of the shift lever, driving of the internal combustion engine
Power is transferred from the 1st speed main gear of the main shaft to the counter
The reverse idler gear is passed through the first-speed counter gear of the rotary shaft.
And the reverse synchronization switching mechanism is transmitted to the river.
Connect the swirler gear and the reverse idler shaft.
The reverse idler shaft to
Transmission to the final driven gear via the internal gear
The final driven gear is rotated .

[0025]

According to the structure of the present invention, firstly , the reverse
Place the idler shaft on the differential side and pivotally support the transmission case.
The reverse idler shaft is equipped with a counter shaft with 1st speed cow
If a reverse idler gear that meshes with the
Both reverse gears mesh with the final driven gear.
When equipped with an internal gear to operate the shift lever in reverse
The driving force of the internal combustion engine is
Transmitted to the reverse idler gear through the first speed counter gear
The reverse synchronization switching mechanism works with the reverse idler gear.
By connecting to the reverse idler shaft, the river
From the idler shaft to the reverse final gear,
The final driven gear is transmitted to the null driven gear.
Rotate ya. By the way, in this transmission, there is no reverse gear in the main shaft and the counter shaft, which allows the size of the transmission in the entire length direction to be shortened. Further, since the transmission has a margin in the entire length direction, the structure of the 6-speed transmission can be realized within the width of the conventional 5-speed transmission, the reverse shift mechanism is simplified, and the transmission case is further processed. Etc. can be simplified and made cheaper.

Secondly, the reverse idler shaft is connected to the differential section side.
, And is provided so as to be pivotally supported by the transmission case, and
The idler shaft meshes with the counter lowest speed gear of the counter shaft.
Equipped with a reverse idler gear
One end of the reverse idler shaft and the
Reverse synchronous switching mechanism that connects with the verse idler gear
On the other end of the reverse idler shaft.
Installed a reverse final gear that meshes with the driven gear
Drive the internal combustion engine during reverse operation of the shift lever.
The force is from the 1st speed of the main shaft to the 1st speed of the counter shaft.
It is transmitted to the reverse idler gear through the counter gear,
Reverse synchronous switching mechanism has reverse idler gear and river
By connecting with the swirler shaft, the reverse eye
Final drive from drive shaft through reverse final gear
It is transmitted to the driven gear and rotates the final driven gear.
Turn over. By the way, in this transmission, the main shaft and the counter shaft do not have reverse gears, and thus the size of the transmission in the entire length direction can be shortened.
And since the transmission has a margin in the entire length direction,
The structure of a 6-speed transmission can be realized within the width of the speed transmission, the reverse shift mechanism can be simplified, the processing of the transmission case can be simplified, and the cost can be reduced. Reverse synchronization switching mechanism to the gear can be the attached Ri easily collected.

[0027]

Embodiments of the present invention will be described in detail and specifically with reference to the drawings. 1 to 5 show an embodiment of the present invention. In FIG. 1, 2 is a transmission of a front engine front drive vehicle (FF vehicle), 4 is a gear portion, 6 is a differential portion, and 8 is a transmission case. In the transmission case 8, a main shaft 10 which is an input shaft to which a driving force from an internal combustion engine (not shown) is intermittently connected by a clutch (not shown) and a counter shaft 12 are the entire length of the transmission 2. They are arranged in the direction (longitudinal direction) and substantially parallel to each other.

The main shaft 10 is held by the first main shaft bearing 18 held by the right wall portion 16 of the right case 14 of the transmission case 8 and the left wall portion 22 of the left case 20 of the transmission case 8. It is rotatably supported by the second main shaft bearing 24.

The counter shaft 12 is arranged on the side of the small differential portion 6 and is held by the first counter shaft bearing 26 held by the right wall portion 16 of the right case 14 and the left wall portion 22 of the left case 20. It is rotatably supported by the second counter shaft bearing 28.

The main shaft 10 is provided with a plurality of stages of respective main speed gears, in order from the internal combustion engine side, a first speed main gear 30.
And a second speed main gear 32 are provided and 3
A high speed main gear 34, a fourth speed main gear 36, a fifth speed main gear 38 and a sixth speed main gear 40 are provided.

On the counter shaft 12, a final reduction mechanism 42 is sequentially provided from the internal combustion engine side as a multi-stage counter each speed gear.
Is provided with a final drive gear 44, and the first speed counter gear 4 meshes with the first speed main gear 30.
6 is provided, and 2 which meshes with the second-speed main gear 32
A speed counter gear 48 is provided, and a third speed counter gear 50 that meshes with the third speed main gear 34, a fourth speed counter gear 52 that meshes with the fourth speed main gear 36, and a fifth speed counter gear 58 that meshes with the fifth speed main gear 38. A sixth speed counter gear 56 that meshes with the sixth speed main gear 40 is provided.

The counter shaft 12 between the first speed counter gear 46 and the second speed counter gear 48 is provided with a first speed / second speed synchronous switching mechanism 60 having a first speed / second speed sleeve 58.

5th speed main gear 38 and 6th speed main gear 40
5th and 6th speed sleeves 66 on the main shaft 10 between
A fifth-speed / sixth-speed synchronous switching mechanism 68 is provided.

The end portion of the left case 20 is closed by an end case 70 as shown in FIG.

A final driven gear 72 is provided in mesh with the final drive gear 44 of the counter shaft 10. This final driven gear 72
It is fixed to the differential case 74 of the differential section 6 by gear mounting bolts 76. Inside the differential case 74, a differential pinion shaft 78 fixed to the differential case 74, differential pinion gears 80-1 and 80-2 provided at both ends of the differential pinion shaft 78, and the differential pinion gear 8 are provided.
Left and right differential side gears 82-1 and 82-2 meshed with 0-1 and 80-2, respectively, are provided.

The differential case 74 is rotatably supported by the one side case bearing 88 held by the left case 20 left supporting portion 86 on the outer peripheral surface of the one side shaft holding portion 84-1 on the left side. The outer peripheral surface of the other side shaft holding portion 84-2 is rotatably supported by the other side case bearing 92 held by the light supporting portion 90 of the light case 14.

Gear side spline holes 94-in which splines are formed in the differential side gears 82-1 and 82-2.
1, 94-2 are formed.

The shaft holding portion 84 of the differential case 74-
1, 84-2, the gear side spline hole 94-1,
Shaft holding holes 96-1 and 96-2 communicating with 94-2 are formed.

The gear side spline holes 94-1 and 94-
Left and right axle shafts (not shown) are connected to 2 and the shaft holding holes 96-1 and 96-2.

The transmission case 8 on the side of the differential portion 6 has a reverse idler shaft 1 which constitutes a reverse shift mechanism 98.
00 is pivotally supported. This reverse idler shaft 1
00 has one end rotatably supported by the first idler shaft bearing 102 held by the left case 20, and the other end rotatably supported by the second idler shaft bearing 104 held by the right case 14. It is supported.

The reverse idler shaft 100 is provided with a reverse idler gear 106 which meshes with the first speed counter gear 46 which is the counter lowest speed gear of the counter shaft 12, and a reverse final gear 108 which meshes with the final driven gear 72. To be

Further, on one end side of the reverse idler shaft 100, between the first idler shaft bearing 102 and the reverse idler gear 106, a reverse synchronous switching mechanism for connecting the reverse idler shaft 100 and the reverse idler gear 106 during a reverse operation. 110 is provided.

The reverse synchronization switching mechanism 110 includes a reverse hub 112 spline-coupled to the reverse idler shaft 100, a reverse synchronizer key 114 axially provided on the reverse hub 112, and a shaft for the reverse synchronizer key 114. The reverse sleeve 116 is provided so as to be movable in the direction.

Therefore, the reverse idler shaft 100
Is located on the differential portion 6 side and is disposed in the dead space in the transmission case 8, as shown in FIGS.

The transmission 2 constructed as described above is operated to change gears by the gear change operation unit 118 shown in FIG.

The shift operation unit 118 is provided with a shift-and-select shaft 120 that is axially moved at the time of selection by a shift lever (not shown) and is rotated in the circumferential direction at the time of shift. There is. An interlock plate 122 is provided on the shift and select shaft 120.

A shift and select lever 124 is provided on the shift and select shaft 120 in the interlock plate 122.

This shift and select lever 124
By the operation of the shift and select shaft 120, the first and second speed shift yokes 126 and the third and fourth speed shift yokes 1
It selectively engages the 28th, 5th and 6th speed shift yokes 130 and the reverse shift yoke 132.

The first / second speed shift yoke 126 communicates with the first / second speed shift shaft 134 provided in the transmission case 8. The third-speed / fourth-speed shift yoke 128 communicates with the third-speed / fourth-speed shift shaft 136 provided in the transmission case 8. The fifth-speed and sixth-speed shift yoke 130 communicates with the fifth-speed and sixth-speed shift shaft 138 provided in the transmission case 8. The reverse shift yoke 132 is used in the transmission case 8.
Is connected to a reverse shift shaft 140 provided in the.

The first / second speed shift shaft 134 is provided with a first / second speed shift fork 142 whose front end engages with the first / second speed sleeve 58. The third / fourth speed shift shaft 136 is provided with a third / fourth speed shift fork 144 whose front end engages with the third / fourth speed sleeve 62. The 5th and 6th speed shift shaft 138 has the above-mentioned 5
A fifth and sixth speed shift fork 146 that engages with the sixth and sixth speed sleeves 66 is provided. Reverse shift shaft 140
Is provided with a reverse shift fork 148 that engages with the reverse sleeve 116.

Next, the operation of this embodiment will be described.

During reverse operation of the shift lever,
The driving force from the internal combustion engine is transmitted from the first speed main gear 30 through the first speed counter gear 46 to the reverse idler gear 106, and the reverse synchronous switching mechanism 110 connects the reverse idler gear 106 and the reverse idler shaft 100. Is transmitted from the reverse idler shaft 100 to the final driven gear 72 via the reverse final gear 108, and the final driven gear 7
Rotate 2.

By the way, the transmission 2 of the FF vehicle of this embodiment
1, there is no reverse shift mechanism gear on the main shaft 10 and the counter shaft 12, as shown in FIGS.
Moreover, as shown in Nos. 3 to 5, the reverse idler shaft 100 is used.
Since the reverse idler gear 106 is disposed in the dead space in the transmission case 8 on the differential portion 6 side, the size of the transmission 2 in the entire length direction can be shortened.

Further, since a space is formed in the entire length direction of the transmission 2, the width of the conventional 5-speed transmission shown in FIGS. 6 and 7 corresponds to the 6-speed transmission as shown in FIGS. 2 can be configured.

Further, the structure of the reverse shift mechanism 98 of the reverse idler shaft 100 can be simplified, the processing of the transmission case 8 can be simplified, and the cost can be reduced.

Furthermore, since the reverse synchronization switching mechanism 110 only needs to be attached to one end of the reverse idler shaft 100, the reverse synchronization switching mechanism 110 can be easily attached due to its structure.

[0057]

As is apparent from the above detailed description, according to the present invention, firstly , the reverse idler shaft is connected to the differential portion side.
, And is provided so as to be pivotally supported by the transmission case, and
The idler shaft is meshed with the first speed counter gear of the counter shaft.
Reverse idler gear is installed and finalized
Installed a reverse final gear that meshes with the driven gear
Drive the internal combustion engine during reverse operation of the shift lever.
The force is from the 1st speed main gear of the main shaft to the 1st speed counter gear.
Is transmitted to the reverse idler gear via the
Switching mechanism is reverse idler gear and reverse idler shaft
By connecting the reverse idler shaft and
After berth final gear to final driven gear
By transmitting and transmitting the final driven gear, there is no reverse gear on the main shaft and the counter shaft, so that the dimension of the transmission in the entire length direction can be shortened, and thus, in the entire length direction of the transmission. With a margin, the structure of a 6-speed transmission can be realized within the width of the conventional 5-speed transmission, the reverse shift mechanism is simplified, and further processing of the transmission case can be simplified and the cost can be reduced.

Secondly, the reverse idler shaft is connected to the differential unit side.
, And is provided so as to be pivotally supported by the transmission case, and
The idler shaft meshes with the counter lowest speed gear of the counter shaft.
Equipped with a reverse idler gear
One end of the reverse idler shaft and the
Reverse synchronous switching mechanism that connects with the verse idler gear
On the other end of the reverse idler shaft.
Installed a reverse final gear that meshes with the driven gear
Drive the internal combustion engine during reverse operation of the shift lever.
The force is from the 1st speed of the main shaft to the 1st speed of the counter shaft.
It is transmitted to the reverse idler gear through the counter gear,
Reverse synchronous switching mechanism has reverse idler gear and river
By connecting with the swirler shaft, the reverse eye
Final drive from drive shaft through reverse final gear
It is transmitted to the driven gear and rotates the final driven gear.
By rotating the main shaft and the counter shaft, there are no reverse gears, which reduces the size of the transmission in the entire length direction. The structure of a 6-speed transmission is possible within the width of a 5-speed transmission, the reverse shift mechanism is simple, and further, the processing of the transmission case and the like can be simplified, and the cost can be reduced. Reverse synchronization switching mechanism may attach easily taken to the idler gear.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a transmission for six speeds.

FIG. 2 is a skeleton diagram of the transmission of FIG.

FIG. 3 is a configuration diagram of a shift operation unit.

FIG. 4 is a diagram showing an arrangement of gears.

FIG. 5 is a side view of the transmission.

FIG. 6 is a configuration diagram of a conventional 5-speed transmission.

7 is a skeleton diagram of the transmission of FIG.

[Explanation of symbols]

2 transmission 6 Differential section 8 transmission case 10 Main axis 12 counter axes 30 1st speed main gear 44 final drive gear 46 1st speed counter gear 72 Final Driven Gear 74 differential case 98 Reverse shift mechanism 100 reverse idler shaft 106 Reverse idler gear 108 Reverse Final Gear 110 Reverse synchronization switching mechanism 116 reverse sleeve

Claims (2)

(57) [Claims] 1. A main shaft, a counter shaft, and a reverse idler shaft are arranged substantially parallel to each other in a transmission case, a plurality of main speed gears of a plurality of stages are provided on the main shaft, and the main shaft is provided with each main gear. A counter-speed gear having a plurality of stages corresponding to the speed gear is provided, a final drive gear is provided on the counter shaft, and a final driven gear which is meshed with the final drive gear and fixed to the differential case of the differential portion is provided. In the transmission, the reverse idler shaft is arranged on the differential portion side and is pivotally supported by the transmission case, and the reverse idler shaft is a reverse idler meshed with a first speed counter gear of the counter shaft. gear
And mesh with the final driven gear.
A reverse final gear is installed to
During the berth operation, the driving force of the internal combustion engine is
From the 1st speed main gear through the 1st speed counter gear,
It is transmitted to the verse idler gear and the reverse synchronous switching mechanism
Is the reverse idler gear and the reverse idler shaft
By connecting to and from the reverse idler shaft
Final reverse rib through the reverse final gear
The final driven gear is rotated.
A transmission that is characterized by being made. 2. A main shaft, a counter shaft, and a reverse idler shaft are arranged substantially in parallel in a transmission case, a plurality of main speed gears of a plurality of stages are provided on the main shaft, and the main shaft is provided with each main gear. A counter-speed gear having a plurality of stages corresponding to the speed gear is provided, a final drive gear is provided on the counter shaft, and a final driven gear which is meshed with the final drive gear and fixed to the differential case of the differential portion is provided. In the above transmission, the reverse idler shaft is arranged on the side of the differential portion and is pivotally supported by the transmission case, and the reverse idler shaft is engaged with a counter idler gear of the counter shaft. A gear is provided to connect one end of the reverse idler shaft with the reverse idler gear during reverse operation. Provided Bath synchronous switching mechanism, the reverse final gear which is meshed with the final driven gear provided at the other end of the reverse idler shaft, Schiff
The drive force of the internal combustion engine is
From the 1st speed main gear of the main shaft to the 1st speed of the counter shaft
It is transmitted to the reverse idler gear through the counter gear.
The reverse synchronization switching mechanism is installed in the reverse idler.
By connecting the gear and the reverse idler shaft,
From the reverse idler shaft to the reverse final
Is transmitted to the final driven gear via a gear,
A transmission characterized by rotating the final driven gear .