JP3463363B2 - Switching mechanism of auxiliary 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 switching mechanism for an auxiliary transmission.
In particular, the auxiliary transmissionPlanetary gear train phosphorus
Gear and switching sleeveHigh speed, neutral and low speed by moving
And the planetary carrier hits the output shaft.
Can be fixed firmly without causing
The present invention relates to a switching mechanism of an auxiliary transmission that can be reduced. [0002] 2. Description of the Related Art In a four-wheel drive vehicle, an engine is driven.
The force is converted and taken out by the transmission, and this driving force is pushed forward.
Driving the front and rear wheels by distributing them to the axle and the rear propulsion axis
are doing. In such a four-wheel drive vehicle, the transmission
Sub-transmission that further converts and extracts the extracted driving force
Some are provided. A conventional auxiliary transmission is disclosed in, for example,
JP-A-60-215427 and JP-A-63-13822
Some are disclosed in the gazette. [0004] Japanese Patent Application Laid-Open No. 60-215427 discloses
Is the driveshaft to which the engine rotation is transmitted.
Separate the rear drive shaft coaxially with the shaft
With the front drive parallel to this rear drive shaft.
A live shaft is provided, and the shaft end of the drive shaft
Axially on the sun gear and the rear drive shaft
The sun gear is movably engaged with a spline.
Carrier case that can be disengaged from the carrier case and this carrier case
A planetary gear that is journalled to mesh with the sun gear
The carrier case is rotatably held by the carrier case.
Planetary gear consisting of a ring gear meshing with the gear
A speed reducer having a rain is provided.
A shift mechanism that switches the meshing state of the gear train
Provided. [0005] The shift mechanism is provided with the rear driveshaft.
With the shaft and front drive shaft disconnected
In this state, the sun gear and the carrier case
Connect drive shaft and rear drive shaft
A first shift position, the rear drive shaft and the Freon;
Drive shaft with the drive shaft connected.
Keep the shaft and rear drive shaft connected
A second shift position between the sun gear and the carrier case;
With the engagement released, the drive shaft and rear drive
3rd shift position to disconnect the connection with the eve shaft, front
Planetary gear train that prevents rotation of the ring gear
To transmit the decelerated rotation by the rear drive shaft
Are sequentially switched. [0006] Japanese Patent Application Laid-Open No. 63-13822 discloses
Some of them have an input shaft connected to the transmission output shaft,
That the first output shaft is separated coaxially from the input shaft of
A second output shaft is provided in parallel with the input shaft,
The sun gear provided at the shaft end of the power shaft meshes with this sun gear
A carrier provided on the input shaft to support a pinion;
Between the fixing member fixed to the device case and the carrier
Ring gear that is held rotatably and meshes with the pinion
An auxiliary transmission having a planetary gear device consisting of
And the ring gear is
Gears and carrier and fixed members are switched to disconnected state
The slide sleeve is provided. [0007] The slide sleeve is provided with the ring gear.
When the planetary gear unit is
Release the connection between the transmission output shaft and the input shaft
When the ring gear and carrier are connected,
The transmission output shaft and the input shaft are connected, and the ring gear and
The rotation of the transmission output shaft when the fixed member is
Is decelerated and transmitted to the input shaft. [0008] SUMMARY OF THE INVENTION However, Japanese Patent Application Laid-Open
No. 60-215427 discloses a carrier.
Case to the rear drive shaft so that it can move axially.
The gear is engaged with the carrier case and the ring gear is
Roll case, the carrier case and ring gear
The auxiliary transmission is switched by axial movement. For this reason, Japanese Patent Application Laid-Open No. 60-215427 discloses
What is described in the report is the carrier case and
Gear and the ring gear must be moved.
Between the rear drive shaft that supports the rear case
There is an inconvenience of rattling, and the carrier case
There are inconveniences that cannot be supported. [0010] Further, Japanese Patent Application Laid-Open No. 63-13822 describes the above.
Is disclosed in US Pat.
Id sleeve is provided by spline engagement, and the ring gear is
Rotation between fixed member and carrier fixed to the equipment case
Holding as possible. For this reason, JP-A-63-13822
Is a slide three around the ring gear
There is a disadvantage that the total outer diameter increases due to the
When the ring gear slides on the fixed member and the carrier
There is a disadvantage that the mechanical loss becomes larger,
Thrust gap between fixing member and carrier and ring gear
The clearance in the thrust direction is large due to the need for
There is a disadvantage. [0012] SUMMARY OF THE INVENTION Accordingly, the present invention provides
Input to which driving force is input to eliminate the inconvenience
AxisRotatably supported on the auxiliary transmission caseProvided,
A drive sprocket is fixedly provided on the force shaft, and the input
Output shaft parallel to the axisThe sub-transmission case is rotatably mounted on the shaft.
SupportAnd a driven sprocket on this output shaft.rotation
FreelyThe drive sprocket and the drive
Install the chain around the driven sprocket,
On the force axisRotatableThe sun gear supported on the shaft and this sun gear
The planetary gear to be meshed with the output shaft
A planetary carrier for supporting the planetary gear and the planetary carrier;
Meshed with planetary gearsWith the axis of the output shaft
Movable in the directionWith ring gearPlanetary gear consisting of
TrainA sub-transmission havingConnection of this auxiliary transmission
A switching mechanism that switches the state between high speed, neutral and low speed is provided,
This switching mechanism is driven by the driven sprocket
A dog is provided, and the planetary carrier is
The driven side dog and the carrier side
On the chain side of the planetary gear and on the side opposite to the chain.
Before being moved in the axial direction of the output shaft, respectively
The ring gear is provided so as to be meshable and disengageable,
The case side dog is provided in the machine case, and this case side dog
Is provided on the opposite side of the sun gear chain,
The dog and sun gear are moved in the axial direction of the output shaft
A switching sleeve is provided so as to be meshable and disengageable, and the ring
Ring gear shift engaged with gear and switching sleeve
A shift fork for fork and sleeve is provided.
Shift fork for ring gear and shift for sleeve
The shaft is fixed to the shift shaft, and the shift shaft
The shaft can be moved to the auxiliary transmission case in the axial direction of the output shaft.
It is provided in the case of high speed switching and neutral switching.
The movement of the output shaft in the axial direction is high when switching at low speed.
It is positioned at the speed position, the neutral position, and the low speed position,
The switching mechanism moves the shift shaft to a high speed position.
MovedWhen switching at high speedThe ring gear is
Gear and the driven dog and carrier dog
And the switching sleeve is attached to the case side dog.
Only meshed,Prevention of rotation of the planetary gear
The planetary carry for the driven sprocket
Ya at the same speed,Previous Shift shaft to neutral position
MovedWhen switching neutralThe ring gear is
Before being engaged with the Tali gear and the driven side dog
The switching sleeve is engaged only with the case side dog,Said
Due to the permissible rotation of the planetary gear,
Said againstSun gearIdle,The shift shaft
Was moved to the low speed positionAt low speed switching, Said phosphorus
Gears mesh with the planetary gears and the driven dog.
And the switching sleeve is
Gear and sun gear,Prevent rotation of the sun gear and front
Due to the rotation of the planetary gear,
Rotating the planetary carrier with respect to the
The ring gearAnd switching sleeveThe output shaft
In the axial direction ofOf the auxiliary transmissionSwitch connection status
It is characterized by [0013] According to the structure of the present invention, the auxiliary transmission is provided with
Gear, planetary gear, planetary carrier and ring gear
WhenPlanetary gear train consisting ofHas,This sub-shift
Switching mechanism that switches the connection state of the machine between high speed, neutral and low speed
Moved the shift shaft to the high-speed positionFast switching
Sometimes, Ring gear is planetary gear and driven side dog
And the switching dog
Is engaged only with the dog on the case,Planetary gear
Prevents rotation of the driven sprocket
Rotate the Tari carrier at the same speed,For neutral shift shaft
Moved to positionWhen switching neutral, Ring gear is planetar
Switched and engaged with the gear and driven side dog
The sleeve is engaged only with the dog on the case,Planetary
For driven sprockets by allowing gear rotationSa
GearIdle,Move shift shaft to low speed position
LetAt low speed switching, Ring gear and planetary gear
The switching sleeve is engaged with the dog on the
Meshed with the case side dog and sun gear,Sun gear times
Driving due to rotation prevention and planetary gear rotation tolerance
Reduce the rotation of the planetary carrier with respect to the
Ring gearAnd switching sleeveThe axis direction of the output shaft
To change the connection state of the sub-transmission by moving the
So that when switchingPlanetary gear trainring
One piece of gearCan only be moved,Also ring
The gear is driven by the self-aligning action of the planetary gear train.
Maintains shaft center even when loose engagement with driven sprocket
can do. [0014] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
I will tell. 1 to 4 show an embodiment of the present invention.
is there. In FIG. 1, reference numeral 2 denotes a subtransmission. This sub-shift
Machine 2 is an engine mounted on the front side of a four-wheel drive vehicle (not shown).
Connected to the transmission. The auxiliary transmission 2 is an auxiliary transmission
An input shaft 6 for receiving a driving force from a transmission is provided in a case 4.
I am. The input shaft 6 isFor sub transmission case 4Input 1 ・
By the second bearings 8 and 10RotatableIt is pivoted. input
A drive sprocket 12 is fixedly provided on the shaft 6.
I have. The sub-transmission 2 has an output parallel to the input shaft 6.
A shaft 14 is provided. The output shaft 14 is a rear output shaft 14-
1 and a front output shaft 14-2. Rear output shaft 14-
1 and the front output shaft 14-2 are arranged in series.
The rear output shaft 14-1 is connected to the rear transmission case 4 by a rear output shaft.
By the first and second bearings 16 and 18RotatableAxle support, illustrated
Not connected to the rear propulsion shaft. Front output shaft 14-2
Is connected to the auxiliary transmission case 4 by the front output first bearing 20.Times
Free to rollIt supports the shaft and the rear side is the rear output shaft 14-
1 to the front output second bearing 22RotatableAxle, figure
Connected to front propulsion shaft not shown. The rear output shaft 14-1 has a driving force
Proket 24 is driven by driven bearing 26Rotatableaxis
Support. Drive sprocket 12 and drive
A chain 28 is wound around the sprocket 24
ing. The rear output shaft 14-1 and the front output shaft 14
-2, a two-wheel / four-wheel switching mechanism 30 is provided.
You. The two-wheel / four-wheel switching mechanism 30 includes a synchronizer hub 3.
2 and synchronizer key 34 and synchronizer ring 3
6, Synchronizer Dog 38 and Synchronizer Three
The sleeve 40 and the dog 38
By releasing, the output shaft from the rear output shaft 14-1 to the front output shaft
The transmission of the driving force to 14-2 is interrupted to achieve two-wheel drive.
The rear output is generated by engaging the leave 40 with the dog 38.
The driving force is transmitted from the shaft 14-1 to the front output shaft 14-2.
And four-wheel drive. The auxiliary transmission 2 is connected to a rear output shaft 14-1.
A planetary gear train 42 is provided. Planetary
The gear train 42 is connected to the rear output shaft 14-1.Rotatable
A sun gear 44 supported by a shaft and meshed with the sun gear 44
Fixed to the planetary gear 46 and the rear output shaft 14-1
Planetary carrier for supporting the planetary gears 46
Gear 48 and the planetary gear 46With after
Movable in the axial direction of the side output shaft 14-1Ring gear 5
0. The sun gear 44 is a sun gear bearing
52 to the rear output shaft 14-1RotatablePivoted
I have. The rear output shaft 14-1 is fixed to the rear output shaft 14-1.
The planetary carrier 48 has
Unit 24 by driven bearing 26RotatablePivot
I have. Therefore, the driven sprocket 24 is
The planetary carrier 48 fixed to the output shaft 14-1
Via a driven bearing 26 on the rear output shaft 14-1
RotatablePivotIsing. The auxiliary transmission 2 is connected toFast and neutral
And slowA switching mechanism 54 for switching is provided. Switching machine
The structure 54 has a driven hub on the driven sprocket 24.
56 is fixed, and the driven side hub 56 is
A side dog 58 is provided. In addition, the switching mechanism 54
Carrier-side dog 60 is provided on planetary carrier 48
ing. Driven dog 58 and carrier dog 6
0 is provided on the rear side and the front side of the planetary gear 46, respectively.
And is moved in the axial direction of the rear output shaft 14-1.
A ring gear 50 is provided so as to be able to engage and disengage. The switching mechanism 54 is provided with an auxiliary transmission cable.
The case-side hub 62 is fixedly provided on the case 4
The hub 62 is provided with a case-side dog 64. Case side
The dog 64 is provided on the front side of the sun gear 44.
The case side dog 64 and the sun gear 44 have a rear output shaft.
The switching sleeve 66 moved in the axial direction of 14-1
It is provided so as to be able to join and leave. The switching mechanism 54 includes the ring gear 50
And shift for ring gear engaged with switching sleeve 66
Providing fork 68 and sleeve shift fork 70
ing. Shift fork 68 and sleeve for ring gear
Shift fork 70 is fixed to a shift shaft 72.
Provided. The shift shaft 72 is attached to the auxiliary transmission case.
4 supports the rear output shaft 14-1 so that it can move in the axial direction.
Provided. The shift shaft 72 includes a positioning mechanism 74
Smell at high speed switching, neutral switching and low speed switching
And the movement of the rear output shaft 14-1 in the axial direction.For high speed
Position, neutral position and low speed positionPositioned. Rank
The positioning mechanism 74 is provided with a shift shaft
A holding hole 76 is provided so as to be oriented in the radial direction
The pressure spring 78 presses the hole
The sphere 80 elastically pressed in the direction
High-speed positioning where the sphere 80 is elastically engaged with the shaft 72
Recess 82, neutral positioning recess 84, and low-speed positioning recess
A part 86 is provided. The shift shaft 72 includes a shift lever
88 moves in the axial direction of the rear output shaft 14-1.
You. The shift lever 88 shifts to a lower intermediate portion.
A spherical portion 90 which is the center of the
72 is provided with an engaging portion 94 to be engaged with the engaging hole 92.
Is provided with a shift knob (not shown). shift lever
The spherical portion 90 of 88 is attached to the support portion 96 of the subtransmission case 4.
More spherical support. The switching mechanism 54 is connected to a shift lever 88
The shift shaft 72 is connected to the axis of the rear output shaft 14-1.
In the direction of high-speed switching, neutral switching, and low-speed switching.
, The rear output shaft 14-
One axial movement is positioned. The switching mechanism 54Shift shaft 72 high
Moved to speed positionFast switchingTimeThen, as shown in FIG.
The ring gear 50 is connected to the planetary gear 46 and the driven side
Gear 58 and the carrier side dog 60Totoro
The switching sleeve 66 is engaged only with the case side dog 64
Re, Driven sprocket 24 and planetary gear 46
The planetary carrier 48 is connected to the planetary gear
The rotation of 46 is prevented. The switching mechanism 54Shift shaft 72 inside
Moved to standing positionAt the time of neutral switching, as shown in FIG.
The ring gear 50 is connected to the planetary gear 46 and the driven side
Gear 58And the switching sleeve 66 is
Only meshed with the dog 64, Driven sprocket
24 and the planetary gear 46 are connected, and the planetary gear
The rotation of the gear 46 is allowed. The switching mechanism 54Shift shaft 72 low
Moved to speed positionAt the time of low-speed switching, as shown in FIG.
The ring gear 50 is connected to the planetary gear 46 and the driven side
And the switching sleeve 66 is
Driven dog 64 and the sun gear 44
Connecting the sprocket 24 and the planetary gear 46
And the sun gear 44 and the case-side hub 62 are connected.
To allow the planetary gear 46 to rotate and
The rotation of the gear 44 is prevented. As a result, the switching mechanism 54 operates during high-speed switching.
To prevent the planetary gear 46 from rotating.
The planetary carrier 48 rotates at the same speed as the
And the rotation of the planetary gear 46 is allowed during neutral switching.
Driven sprocket 24Sun gear 44The sky
To prevent the sun gear 44 from rotating and
Driven sprocket by allowing rotation of the sprocket 46
24, the planetary carrier 46 is decelerated and rotated.
Therefore, the ring gear 50And switching sleeve 66The rear output
Move in the axial direction of shaft 14-1Of the auxiliary transmission 2Connected
Switch state. Next, the operation will be described. The driving force of the engine (not shown)
Is input to the input shaft 6 of the auxiliary transmission 2 via the
Driven sprocket driven by rocket 12 through chain 28
It is transmitted to the rocket 24. Driven sprocket 24
The driving force transmitted to the motor is switched at high speed by the switching mechanism 54, respectively.
Switching between switching, neutral switching, and low-speed switching
The power is transmitted to the rear output shaft 14-1. The switching mechanism 54 is controlled by a shift lever 88.
Shift shaft 72 from neutral switching state to rear output shaft 14
1 in the direction of the axis B of FIG.
0 is resiliently engaged with the high-speed positioning concave portion 82 to perform high-speed switching.
State. The switching mechanism 54 is shown in FIG.
Thus, the ring gear shift fork 68
The gear 50 is composed of the planetary gear 46 and the driven dog 58.
And the driven dog 60
Rocket 24, planetary gear 46 and planetary carry
And the wire 48. As a result, the switching mechanism 54 is driven by the planetary
The rotation of the gear 46 is prevented, and the driven sprocket 24
On the other hand, the planetary carrier 48 is rotated at the same speed. Plastic
The spoiler 48 is fixed to the rear output shaft 14-1.
By having the driven sprocket 24
The side output shaft 14-1 is rotated at the same speed. At this time, the planetary gear 46 and the sun gear
No driving force is transmitted to the driving force. In addition, switching
The leave 66 is engaged only with the case side dog 64.
You. The switching mechanism 54 is controlled by a shift lever 88.
The shift shaft 72 in the high-speed switching state shown in FIG.
Move in the direction of the axis A of the force axis 14-1 in the direction A of FIG.
The sphere 80 is elastically engaged with the neutral positioning recess 84.
To a neutral switching state. The switching mechanism 54 is shown in FIG.
Thus, the ring gear shift fork 68
The gear 50 is composed of the planetary gear 46 and the driven dog 58.
And the driven sprocket 24 and planetary
The gear 46 is connected. As a result, the switching mechanism 54 is
Allows the rotation of the gear 46 and allows the driven sprocket 24
forSun gear 44Idle. The ring gear 50 is
It is open from the planetary carrier 48. Ringgi
The driving force transmitted to the gear 50 is the difference between the planetary gears 46.
It is not transmitted to the planetary carrier 48 due to dynamic rotation.
Therefore, the driving force is not transmitted to the rear rotation shaft 14-1. The switching mechanism 54 is controlled by a shift lever 88.
The shift shaft 72 in the neutral switching state shown in FIG.
Further movement in the direction A of FIG.
The sphere 80 elastically engages the low-speed positioning recess 86.
Then, a low-speed switching state is set. The switching mechanism 54 is shown in FIG.
Thus, the ring gear shift fork 68
The gear 50 is composed of the planetary gear 46 and the driven dog 58.
And the shift fork 70 for the sleeve.
Switch sleeve 66 and case side dog 64 and sangi
And the driven sprocket 24 and the plastic
The spur gear 46 and the sun gear 44
The case-side hub 60 is connected. Thus, the switching mechanism 54 is driven by the planetary
Allow rotation of gear 46 and prevent rotation of sun gear 44
And the driven sprocket 24
The rear 48 is rotated at a reduced speed. Transmitted to the ring gear 50
The driving force is reduced by the planetary gear 46 and
Transmitted to the spur carrier 48 and thus the rear rotating shaft
14-1 is rotated at a reduced speed. As described above, the switching mechanism 54 operates at the time of high-speed switching.
To prevent the planetary gear 46 from rotating.
The planetary carrier 48 rotates at the same speed as the
And the rotation of the planetary gear 46 is allowed during neutral switching.
Driven sprocket 24Sun gear 44The sky
To prevent the sun gear 44 from rotating and
Driven sprocket by allowing rotation of the sprocket 46
24, the planetary carrier 46 is decelerated and rotated.
Therefore, the ring gear 50And switching sleeve 66The rear output
The auxiliary transmission 2 is moved in the axial direction of the shaft 14-1 to
Switch state. That is, the switching mechanism 54 includes the ring gear 50
And switching sleeve 44Is the axial direction of the rear output shaft 14-1
To change the connection state of the auxiliary transmission 2
So that when switchingPlanetary gear train 42Re
Member of the ring gear 50Can only be movedMa
Also, the self-aligning action of the planetary gear train 42
Engage the ring gear 50 with the driven sprocket 24
Even if loosened, the axis can be maintained. Therefore, the switching mechanism 54 of the auxiliary transmission 2
Sets the auxiliary transmission 2Of planetary gear train 42ring
Gear 50And the switching sleeve 44High speed and neutral by moving
Switch to and low speedThe planetary
The gear train 42By moving only the ring gear 50
To move the planetary carrier 48 to the rear output shaft 1
4-1 firmly fixed without rattlingTo do
CanAlso, it is possible to cut
The switching operation force can be reduced. The switching mechanism 54 of the auxiliary transmission 2
A slide sleeve for switching is provided on the outer periphery of the ring gear 50
Cause an increase in the total outer diameter.
And the ring gear 50 slides against another member.
Inconvenience of large mechanical loss
Can be avoided and the ring gear
By eliminating the need for a thrust gap between
To avoid the inconvenience of large rattling in the last direction
Can be done. The auxiliary transmission 2 has two-wheel / four-wheel switching.
A mechanism 30 is provided. The two-wheel / four-wheel switching mechanism 30 is
By releasing the engagement between the leave 40 and the dog 38
Driving force from rear output shaft 14-1 to front output shaft 14-2
Transmission is interrupted and two-wheel drive is performed.
38 from the rear output shaft 14-1 to the front side.
By transmitting the driving force to the output shaft 14-2, four-wheel drive is performed.
Can be. [0047] As described above, according to the present invention, the switching device
The structure is a ring gearAnd switching sleeveThe axis direction of the output shaft
To change the connection state of the auxiliary transmission.
More when switchingPlanetary gear trainRinggi
One member of yaCan only be moved, Also a planeta
The ring gear is driven by the self-aligning action of the gear train.
Maintains the shaft center even if the engagement with the bun sprocket is loosened
Can be For this reason, the switching mechanism of the auxiliary transmission
GearboxOf planetary gear trainRing gearAnd switch
LeaveSwitching between high speed, neutral and low speed by movingRuko
When switching, the planetary gear trainRin
Gear planetary planetar
Re-carrier firmly without rattling on output shaft
Can be fixed, and the center of the shaft
The switching operation force can be reduced by holding. The switching mechanism of the auxiliary transmission is a ring mechanism.
Do not provide a slide sleeve for switching around the gear.
This does not cause the disadvantage that the total outer diameter becomes large.
And the ring gear is not in sliding contact with other members.
To avoid the disadvantage of large mechanical loss
And a thrust between the other member and the ring gear
The clearance in the thrust direction is eliminated by eliminating the need for
Can avoid inconveniences
You.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an auxiliary transmission showing an embodiment of the present invention. FIG. 2 is an enlarged sectional view of a main part of a subtransmission in a high-speed switching state. FIG. 3 is an enlarged sectional view of a main part of the auxiliary transmission in a neutral switching state. FIG. 4 is an enlarged view of a main part of the subtransmission in a low-speed switching state. [Description of Signs] 2 Sub-transmission 4 Transmission case 6 Input shaft 12 Drive sprocket 14-1 Rear output shaft 14-2 Front output shaft 24 Driven sprocket 28 Chain 30 Two-wheel / four-wheel switching mechanism 42 Planetary gear train 44 Sun gear 46 planetary gear 48 planetary carrier 50 ring gear 58 driven side dog 60 carrier side dog 64 case side dog 66 switching sleeve 68 ring gear shift fork 70 sleeve shift fork 72 shift shaft 74 positioning mechanism 88 shift lever

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60K 17/344 F16H 3/44

Claims (1)

(57) [Claim 1] The input shaft to which the driving force is input is connected to the auxiliary transmission
A drive sprocket is fixedly mounted on the input shaft, and an output shaft parallel to the input shaft is rotatably supported on the auxiliary transmission case. A driven sprocket is rotatably supported on a shaft, a chain is wound around the drive sprocket and the driven sprocket, and the driven sprocket is rotatable on the output shaft.
Axially supported by a sun gear to the movable while being meshed with the planetary gear and planetary carrier and planetary gears meshing with the sun gear fixed to said output shaft for supporting the planetary gear in the axial direction of said output shaft
The auxiliary transmission provided with a planetary gear train consisting of a ring gear, fast and medium coupling state of the auxiliary transmission
A switching mechanism for switching between standing and low speed is provided.
A driven dog is provided on the driven sprocket,
A carrier dog is provided on the planetary carrier,
The driven dog and carrier dog are planetary.
It is provided on the chain side of the gear and on the opposite side of the chain, respectively.
And the ring gear moved in the axial direction of the output shaft is
The auxiliary transmission case is provided so as to be meshable and disengageable.
The case side dog is provided with a sun gear
And the case side dog and sun
The gear has a switching sleeve that moves in the axial direction of the output shaft.
The ring gear and the switching gear are provided so as to be meshable and disengageable.
Shift fork and ring gear for a ring gear engaged with a sleeve
A shift fork is provided for these gears.
Shift forks for shafts and sleeves
The shift shaft is fixed to the shaft.
Installed in the transmission case so that it can move in the axial direction of the output shaft.
During high-speed switching, neutral switching, and low-speed switching
In the axial direction of the output shaft and the neutral position
And the switching mechanism
The ring gear is connected to the planetary gear when the shift shaft is moved to the high speed position at high speed switching.
When engaged with the bun side dog and the carrier side dog
The switching sleeve is engaged only with the case side dog.
Is, the planetary carrier relative to the driven sprocket by the rotation prevention of the planetary gear is rotated the speed, the shift shaft <br/> neutral switching is moved to the neutral for position, and the ring gear is the planetary gear
The gear is engaged with the driven dog and
Gear is engaged only with the case-side dog, the sun gear rotates idly with respect to the driven sprocket by allowing rotation of the planetary gear, and the shift shaft is driven at a low speed.
The ring gear moves forward when switching to low speed
When the planetary gear meshes with the driven dog
In both cases, the switching sleeve is the case side dog and sun gear
The ring gear and the switching sleeve are moved in the axial direction of the output shaft to reduce the rotation of the planetary carrier with respect to the driven sprocket by preventing rotation of the sun gear and permitting rotation of the planetary gear. A switching mechanism for a sub-transmission, which switches a connection state of the transmission.