JPH05209684A - Assembling method and structure for transmission - Google Patents

Abstract

PURPOSE:To simply assemble a transmission provided with the first and second shafts having multiple gear trains and multiple shift rods having shift forks and automatically assemble the transmission. CONSTITUTION:Multiple shift rods 41-43 are connected to a sub-frame 45 in the fixed positional relation to assemble a shift rod assembly AS1 as a sub-assembly, gear train constituting members are assembled to a main shaft 22 and a counter shaft 23, then both shafts 22, 23 are connected while corresponding gears are engaged to assemble a gear assembly AS2. The shift rod assembly AS1 and the gear assembly AS2 are assembled while shift forks are coupled with gear trains.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of assembling a transmission including first and second shafts having a plurality of gear trains and a plurality of shift rods having a shift fork, and a structure thereof.

[0002]

2. Description of the Related Art Generally, a transmission that changes gears in response to an operation of a change lever has first and second gear trains having a plurality of gear trains.
A shaft and a plurality of shift rods having a shift fork that gives an axial displacement to each gear train are provided, and one of the plurality of shift rods is moved in the axial direction in response to an operation of a change lever, and this shift is performed. A shift fork provided on the rod operates a synchronizer provided for the gear train.

In this type of transmission, for example, as disclosed in Japanese Patent Laid-Open No. 2-8558, a plurality of shift rods are arranged in parallel with each other and are moved in the axial direction with respect to the transmission case. It is possible to install. In the transmission shown in the above publication, each shift rod is attached to a support member attached to the transmission case so as to be movable in the axial direction, and further, an interlock mechanism for preventing simultaneous operation of a plurality of shift rods is provided. Has been done.

[0004]

As a method of assembling a transmission of this type, generally, the first and second shafts and the shift rods are individually attached to a transmission case. Assemble each member to the machine case in sequence, mesh the gears when assembling,
It is also necessary to individually perform operations such as positioning of the shift rod and engagement of the shift fork with the gear train. Therefore, there is a problem that these assembling operations are troublesome and automation is difficult.

Although the transmission disclosed in the above publication is provided with a support member for supporting each shift rod, the support member is attached to the transmission case and the shift rod is attached to the support member. The procedure, the positioning of the shift rod, the method of assembling the shaft provided with the gear train, etc. are not shown, and the assembly method is not improved.

In view of the above circumstances, the present invention can easily assemble a transmission including first and second shafts having a plurality of gear trains and a plurality of shift rods having a shift fork. An object of the present invention is to provide a method of assembling a transmission and a structure thereof that can be easily automated.

[0007]

In order to achieve the above object, a first invention is a first and a second shaft having a plurality of gear trains, and a shift fork for giving an axial displacement to each gear train. A method of assembling a transmission including a plurality of shift rods having a plurality of shift rods, wherein the shift rod assembly is assembled as a subassembly by coupling the plurality of shift rods in a fixed positional relationship with a support member, After assembling the gear train component to the second shaft,
When the corresponding gears of each gear train are engaged,
The second shaft is coupled to assemble the gear assembly, and the shift rod assembly and the gear assembly are assembled in a state in which the shift fork is engaged with the gear train.

A second invention is a transmission provided with first and second shafts having a plurality of gear trains, and a plurality of shift rods having a shift fork for giving an axial displacement to each gear train, A supporting member that has a supporting portion that supports the shift rods and a positioning portion that maintains the shift rods in a fixed positional relationship and that forms a subassembly is provided.

In a third aspect based on the second aspect, the supporting member is provided with a detent mechanism for restricting the movement of each shift rod as a positioning portion for each shift rod.

In a fourth aspect based on the third aspect, the detent mechanism constituting member is accommodated in the detent mechanism accommodating portion projectingly provided on the supporting member to configure the detent mechanism, and the first and second shafts are provided. The support member is arranged on the outer peripheral side of the bearing that supports one end of one of the shafts, and in the space existing between the bearing and the synchronizer arranged near the one end of the one shaft, The detent mechanism accommodating portion has a protruding structure.

According to a fifth aspect of the present invention, in any one of the second to fourth aspects, an interlock mechanism is provided between the shift rods of the support member to prevent simultaneous movement of the plurality of shift rods. It is a thing.

[0012]

According to the method of the first invention and the structure of the second invention applied to this method, when assembling the transmission, first, a plurality of shift rods are combined in a fixed positional relationship and are collectively assembled as a subassembly. This simplifies the work of combining the gear assembly with the gear assembly, and assembling the gear assembly with the gear case.

According to the structure of the third invention, the detent mechanism is used for positioning the shift rods when the shift rods are coupled in a fixed positional relationship to form a subassembly.

According to the structure of the fourth aspect of the invention, the space existing between the bearing and the synchronizing device is used for disposing the detent mechanism.

According to the structure of the fifth invention, the interlock mechanism can be easily assembled when the subassembly is assembled.

[0016]

Embodiments of the present invention will be described with reference to the drawings.
1 to 4 show an example of a transmission to which the present invention is applied. In these drawings, reference numeral 1 denotes a transmission case that also serves as a clutch housing, which is divided into two parts in front and rear, a front case 11 and a rear case 12 thereof. And a plurality of bolts 13 are connected to each other in a state in which the flange portions 110 and 120 are in contact with each other. The transmission case 1 shown in the figure has a cone shape that is generally narrowed toward the rear side, and is formed into a tubular shape having a substantially constant cross section in a predetermined range of an intermediate portion including a combined portion of the front and rear cases 11 and 12. A bolt boss portion 14 is formed on this tubular portion. Inside the transmission case 1, a transmission 2 including members such as an input shaft 21, a main shaft (first shaft) 22 and a counter shaft (second shaft) 23, and a clutch 3 located on the front side of the transmission 2. It is housed. Various auxiliary mechanisms such as a detent mechanism 50 and an interlock mechanism 60 described later in the transmission 2 are arranged inside the tubular portion.

The front case 11 is integrally provided with a clutch housing portion 111 and a mission housing portion 112, and a bearing 115 for the input shaft 21 and the counter shaft 23 is provided in a front portion of the mission housing portion 112 in the front case 11. , 116
Is provided, and the front cover 15 and the collar member 16 located in front of the
It is installed in. On the other hand, bearings 121 and 122 for the main shaft 22 and the counter shaft 23 are arranged in the rear case 12, and
The bearing cover 17 in front of the bearing 121 is attached with a bolt 170.

The input shaft 21 of the transmission 2 is connected to an engine output shaft (not shown) via the clutch 3, and the sliding yoke at the end of a propeller shaft (not shown) is connected to the rear end of the main shaft 22. The input shaft 21 and the main shaft 22 are arranged in a straight line in the front-rear direction and are rotatably coupled to each other via bearings.
Reference numeral 3 is arranged below the main shaft 22 in parallel therewith. These are the bearings 115, 11
It is rotatably supported by the transmission case 1 via 6, 121 and 122.

The rotation of the input shaft 21 is transmitted to the counter shaft 23, and the main shaft 22 and the counter shaft 23 are provided with a gear train including gears for providing a plurality of gear ratios and a synchronizing device. It is arranged.

That is, a drive gear 210 is provided at the rear end of the input shaft 21. Further, on the counter shaft 23, a counter drive gear 230, a counter third speed gear 231, a counter second speed gear 232, and a counter first speed gear 233 and a counter tooth gear 235, which are sequentially arranged from the front side. Reverse gear 234
And a counter overdrive gear 236,
The counter drive gear 230 meshes with the drive gear 210 of the input shaft 21, whereby the counter shaft 23 is interlocked with the input shaft 21.

On the main shaft 22, from the front side, the third-fourth speed synchronizer 24, the third-speed gear 221, the second-speed gear 222, the first-second speed synchronizer 25, the first-speed gear 223,
A reverse gear 224, an overdrive-reverse synchronization device 26, and an overdrive gear 226 are provided, and the gears 221 to 224 and 226 are rotatably attached to the main shaft 22. The respective synchronizing devices 24 to 26 are sleeves 24a, 25a, 26a that slide according to the operation of the shift rods 41 to 43 described later.
When the sleeve slides to the front side, the gear in front of the synchronizer (in the case of the 3rd-4th synchronizer 24, the input shaft 2
1) is connected to the main shaft 22, and when the sleeve slides to the rear side, the gear behind the synchronizer is connected to the main shaft 22. When the sleeve is in the neutral position, the gears on the front and rear sides are not connected to the main shaft 22. Is configured to be.

The third speed gear 221, the second speed gear 222, 1
The high speed gear 223 and the overdrive gear 226 correspond to the gears 231 and 231 of the counter shaft 23, respectively.
It meshes with 32, 233 and 236. The reverse gear 224 is linked to the counter reverse gear 234 via an idle gear provided on the idle shaft 27. In particular, in this embodiment, two reverse gears are integrally rotated in order to increase the reverse reduction ratio. Idle gear 2
71 and 272 are provided on the idle shaft 27, the first idle gear 271 meshes with the counter reverse gear 234, and the reverse gear 224 meshes with the second idle gear 272. The idle shaft 27
Has an attached portion 273 that projects laterally at its rear end, and this attached portion 273 is attached to the rear case 12 by bolts 28.

A spline 228 for connecting a sliding yoke is formed on the rear side of the main shaft 22.

A control rod 40 is attached to the upper portion of the transmission case 1, and first, second and third shift rods 41, 42 and 43 are provided. The control rod 40 is used in the transmission case 1.
The rear end of the link 40 is disposed above the tubular portion of the rear case 12 and protrudes outside the cone-shaped portion of the rear case 12.
By being connected to a change lever (not shown) via 1, the control rod 40 rotates and slides in response to the change lever's selection or shift operation. Further, a connecting member 40 for connecting the change lever holding portion and the transmission case 1 is provided on both sides of the link 401 to prevent unnecessary swinging of the change lever.
4 is arranged, and the transmission side end of the connecting member 404 is
A bracket 405 that is fastened together with a bolt 13 that connects the front and rear cases 12 is connected via a pivot 406 and a rubber bush 407.

As shown in FIG. 3, the control rod 40 is provided with a select engaging piece 40a.
Select gates 41a, 42a, and 43a are provided on the shift rods 41 to 43, respectively, and the engagement piece 4 is formed in accordance with the rotational position of the control rod 40.
0a is selectively the select gates 41a, 42a, 4
It is adapted to engage with one of the 3a. Also,
The shift rods 41 to 43 are provided with sleeves 24 a and 2 of the synchronizers 24 to 26 arranged on the main shaft 22, respectively.
Shift forks 41b and 42 engaging with 5a and 26a
b and 43b are provided.

5 to 8 concretely show the structure of the portion where the shift rods 41 to 43 are supported. In these drawings, the shift rods 41 to 43 are arranged in parallel with each other, and a front portion of the shift rods 41 to 43 is slidably supported by a shift rod support portion 118 formed integrally with the front case 11, and a rear case is provided. A rear portion is slidably supported by a sub-frame 45, which is a support member disposed inside 12.

The sub-frame 45 includes three rows of shift rod support portions 450 in which rod guide holes 451 for inserting the shift rods 41 to 43 are formed, and an end provided on one end side of the support portion 450. Bolt boss portions 452a are provided on both sides of the part wall 452, and a positioning portion for the subassembly is further provided. In this embodiment, the detent mechanism accommodating portion 52 is connected to the support portion 450 for the shift rods 41 to 43 so that the detent mechanism is used as the positioning portion. Then, the corrugated unevenness 51 is formed at a predetermined position near the rear end of each of the shift rods 41 to 43, and the spring 53 and the ball 54 are housed in the cavity 52a in each detent mechanism housing 52. The detent mechanism 50 is configured. The detent mechanism 50 elastically elastically shifts the shift rods 41 to 43 when the ball 54 urged by the spring 53 is pressed against the unevenness 51.
Positioning in the neutral position and operating position of
When the shift rods 41 to 43 are slid, a feeling of motion is given.

The detent mechanism accommodating portion 52 starts from the portion corresponding to each rod guide portion 451 from the shift rod 4
It projects inwardly of the transmission case 1 at right angles to 1 to 43. The sub-frame 45 is arranged on the outer peripheral side of the bearing 121 supporting the rear portion of the main shaft 22, and the space between the bearing cover 17 on the front side of the bearing 121 and the overdrive-reverse synchronization device 26. The detent mechanism storage 52
With the bolt protruding, the sub-frame 4
5 is attached to the rear case 12.

Further, a rattling noise prevention spring 46 for urging at least one shift rod in a fixed direction is provided between the rear end of the shift rod and the transmission case. In the example shown in FIG. 6, a certain amount of friction is applied to the reverse gear 224 to prevent a rattling noise of the gear 224, so that an appropriate urging force is applied to the shift rod 43 for overdrive-reverse forward. It is equipped with a spring 46 that gives This spring 46
Cylindrical spring insertion part 1 formed in the rear case 12
25, and a plug 47 is screwed to the rear end of the spring insertion portion 125.

Further, an interlock mechanism 60 for preventing simultaneous movement of a plurality of shift rods is provided between the shift rods 41 to 43 in the sub-frame 45. The interlock mechanism 60 is shown in FIG. The structure is as shown in FIG. That is, the lock pin 61 is inserted into the through hole 64 that crosses the partition wall between the rod guide holes 451 of the sub-frame 45.
While it is mounted so as to be movable in a direction orthogonal to ~ 43,
Engagement recesses 62 are provided on the inner sides of the shift rods 41 and 43 on both sides and on both sides of the center shift rod 42, respectively, and both ends of the center shift rod 42 face the recesses 62 across them. A pin 63 is attached. When the shift rods 41 to 43 are in the neutral position, the lock pins 61 correspond to the recesses 62. When one shift rod slides to the non-shift position, the lock pins 61 are pushed out to the side. The other shift rod is locked by engaging with the recess 62 of the other shift rod.

In addition to the above-mentioned mechanisms, a reverse misshift prevention mechanism 70 and a select return mechanism 80 are also arranged inside the tubular portion of the intermediate portion of the transmission case 1.

The reverse misshift prevention mechanism 70 is
The shift from overdrive to reverse due to an erroneous operation is prevented, and a main part thereof is unitized and assembled to the rear case 12. That is, as shown in FIG. 4, the protrusion 71 is continuously provided at a predetermined position of the control rod 40, while the misshift prevention unit 72 is provided.
Is a mounting hole 73 formed on the upper side of the rear case 12.
The unit 7 is fixed to the rear case 12 with a bolt (not shown) while being fitted into the unit 7 from the outside.
2 includes a base block 75, a misshift prevention cam 77 rotatably attached to the base block 75 via a pivot 76,
A spring (not shown) that elastically holds the cam 77 at the reference position is provided. When the shift operation is performed from the overdrive position to the reverse position, the tip portion of the cam 77 is pushed by the projecting piece 71 as the control rod 40 slides, and the cam 77 pivots to some extent accordingly. Therefore, the further rotation of the cam 77 is prevented, so that the misshift to the reverse is prevented.

The select return mechanism 80 returns the control rod 40 to the intermediate position within the rotation range (returns the change lever 402 to the intermediate position within the select operation range) when it is brought into the neutral state. It is provided between the upper part and the control rod 40. That is, as shown in FIG. 3, the rear case 1
A pair of return member accommodating holes 81 are formed on both sides of the control rod arranging place of No. 2, and in each accommodating hole 81,
A return piston 82 having a lower end protruding below the accommodation hole 81 and a spring 83 for urging the piston 82 downward are accommodated, and a lid member 84 is screwed to the upper end of the accommodation hole 81. On the other hand, the control rod 40 has
A pair of claw pieces 85 protruding on both sides are continuously provided, and each claw piece 85 is in contact with the lower end of the piston 82. The biasing force of the spring 83 acts on the pair of claw pieces 85 as a restoring force for returning the control rod 40 to the intermediate position.

In the structure of this embodiment as described above,
Subframe 45 supporting each shift rod 41-43
Since the shift rods 41 to 4 are provided with
3 and the detent mechanism 50 etc. can be easily assembled,
Furthermore, the entire transmission can be easily assembled, and the assembly can be automated. That is, each of the shift rods 41 to 43 is previously attached to the sub-frame 45 by an assembling method which will be specifically described later.
, And the detent mechanism 50 and the interlock mechanism 60 are also incorporated in the subframe 45 to form a shift rod assembly as a subassembly. Then, the shift rod assembly is united with the main shaft 22, the counter shaft 23, and the like by an automatic assembling apparatus. Further, in this embodiment, after these are inserted into the front case 11, the rear case 12 is covered from the rear side, and further, the cases 11 and 12 are joined by bolting from the rear side, the subframe 45 is fixed, and the bearing cover is provided. Fixing of 17 etc. is automatically performed.

The shift rods 41 to 43, the detent mechanism 50, the interlock mechanism 60, etc. are compactly arranged. That is, the sub-frame 45 that supports the shift rods 41 to 43 is the bearing 1
21 is provided on the outer peripheral side of the detent mechanism 50 and is provided on the sub-frame 45.
The detent mechanism housing portion 52 for housing 4 projects between the bearing cover 17 and the synchronizing device 26, so that the space existing in this portion is effectively used, and the detent mechanism 50 can be used without taking up an extra space. It is arranged compactly. The detent mechanism accommodating portion 52, when abutting against the bearing cover 17, also serves as a retainer for the bearing cover 17 during assembly. On the other hand, the lock pin 61 of the interlock mechanism 60 is arranged between the shift rods 41 to 43 of the sub-frame 45.
Compactly assembled without increasing the spacing of ~ 43.

Further, since the tooth striking sound preventing spring 46 is incorporated between the shift rods 41 to 43 and the rear case 12, and only the spring insertion portion 125 projects from the rear case 12, a structure for preventing the tooth striking sound is provided. Is also the minimum required, and the spring insertion part 125
The biasing force of the spring 46 can be easily adjusted from the outside by adjusting the screwing amount of the plug 47 at the rear end.

In the above embodiment, each shift rod 4
The rear end sides of 1-43 are supported by the sub-frame 45, and the sub-frame 45 can be attached to the rear case 12 in this state. The front end side of the sub frame 45 may be supported by the sub frame 45, and the sub frame 45 may be attached to the front case 11 in this state.

Further, the shape of the sub-frame 45 is not limited to the above-mentioned embodiment, but may be, for example, the shape shown in FIG. The sub-frame 45 shown in FIG. 9 includes three rows of shift rod support portions 45 that support the shift rods in a parallel state.
5, an end wall 457 provided at one end side of these support portions 455 and having a bolt boss portion 457a, and each support portion 45.
5 is similar to that of the above-described embodiment in that it has a detent mechanism housing portion 52 and the like projecting in a predetermined direction from 5, but each of the support portions 455 is located above the guide hole 456 except the end wall 457. The part is formed in a shape that is open only within a certain range. In the end wall 457, the guide hole end portion 456a is formed in a through hole shape.

The sub-frame 45 having such a shape is convenient for mounting the detent mechanism 50 and inserting the shift rods 41 to 43 as shown in FIGS.

Next, an embodiment of the method for assembling the transmission will be described with reference to FIG.
This will be described with reference to FIGS. In the examples shown in these figures, the sub-frame 45 as shown in FIG. 9 is used, and the front end sides of the shift rods 41 to 43 are supported by the sub-frame 45.

FIG. 10 schematically shows an example of an assembly line for automating the assembly method of the present invention. The assembly line shown in this figure is a shift rod assembly line La, a gear train assembly line Lb, and an entire assembly line. Line L
c and. 11 to 17 described below are performed at a plurality of stations in the shift rod assembly line La, for example, at the first to fourth stations S ₁ , S ₂ , S ₃ , and S ₄ , respectively. 18 to FIG.
Each work up to 0 is performed in the entire assembly line Lc.

As the work to be performed on the shift rod assembly line La, first, in the first station S ₁ , as shown in FIG. 11, it is formed on the end wall 457 at the end of each guide hole 456 in the sub-frame 45. The slide bearing 45 is attached to the through-hole-like portion 456a.
8 is fitted. Subsequently, in the second station S ₂ , as shown in FIG. 12, the shift fork 42b for the third speed and the fourth speed, the shift fork 41b for the first speed and the second speed, and the shift fork 43b for the overdrive-reverse,
It is set in a fixed positional relationship with the sub-frame 45, and a jig (not shown) is used to set this positional relationship.
And each shift fork 41b, 42b, 43b is hold | maintained.

Next, at the third station S ₃ ,
Spring 53 and ball 54 of detent mechanism 50
, The shift rods 41 to 43, and the interlocking lock pin 61 and the like are sequentially inserted (FIGS. 13 to 16). That is, the shift rod support portion 4
The spring 53 and the ball 54 are accommodated in the detent mechanism accommodating portion 52 connected to the lower end portion of the support portion 455 from the upper opening portion of 55, and the ball 54 is pressed by the pressing rod 500 to be pressed into the detent mechanism accommodating portion 52. (Fig. 13). In this state, the shift rod 41
After being inserted into the corresponding shift fork 41b,
The push rod 500 is inserted into the shift rod support portion 455 of the sub-frame 45. In this case, the push rod 500 is displaced as the shift rod 41 is inserted (FIG. 14), and when the shift rod 41 reaches the ball 54, the push rod 500 is removed. Then, the shift rod 41 continues to move forward while pressing the ball.

Then, when the shift rod 41 is inserted to a predetermined position, it is stopped, and in this state, the detent mechanism 5
By engaging the ball 54 of 0 with the predetermined position of the corrugated unevenness 51 formed on the shift rod 41, the shift rod 4
1 is positioned (FIG. 15). Further, the shift rods 41 to 43 are sequentially inserted, and the lock pin 61 and the pin 62 for interlock are inserted into the through hole 64 and the like of the partition wall portion from one side of the sub frame 45 (between them) ( (Fig. 16). When the insertion of all the shift rods 41 to 43 is completed together with the provision of the interlock mechanism 60, the shift pins 41 to 43 are moved by the split pin 47.
Shift forks 41 b to 43 b are fixed to 43. In this way, the shift rod assembly AS ₁ is assembled (FIG. 17).

Such a shift rod assembly AS ₁
Is automatically performed on the shift rod assembly line La, while the components of the gear assembly are assembled on the gear train assembly line Lb, that is, a gear train is formed on the main shaft 22 and the counter shift 23. Each gear, the synchronizing device and the like are assembled, and the gear is also assembled to the idle shaft 23. Then, these gear assembly components and the shift rod assembly AS ₁ are sent to the entire assembly line Lc as shown by the arrow in FIG.

As the work to be carried out on the entire assembly line Lc, first, as shown in FIG. 18, the main shaft 22 and the counter shift 23 are connected to each other while the corresponding gears of each gear train are engaged with each other. The idle shaft 23 is also coupled to assemble the gear assembly AS ₂ , and at the same time, the shift rod assembly AS ₁ is brought into a state in which the shift forks 41 b to 43 b are engaged with the gear train with respect to the gear assembly AS ₂ . It is assembled.

The whole internal mechanism unit as shown in FIG. 19 in which the gear assembly AS ₂ and the shift rod assembly AS ₁ are combined is transferred to a predetermined case assembly station by a transfer robot (not shown). Then, here, the front case 11 is fitted to the entire internal mechanism unit from the front by a case assembling loader (not shown) as shown in FIG. Although not shown in the figure as the subsequent steps, the rear case 12 and the like are coupled to the internal mechanism and the front case 11,
The transmission is completed.

According to the above assembling method, FIGS.
According to the process described in (1), a sub-assembly for connecting the shift rods 41 to 43 is performed using the sub-frame 45. Further, the assembly AS ₁ and the gear assembly AS ₂ are combined, and then these and the transmission case are combined. By doing so, as compared with the case where each shaft and each shift rod is individually assembled to the transmission case, the assembling work is rationalized and simplified, and the whole can be easily automated.

[0049]

In the method of assembling the transmission according to the first aspect of the present invention, the shift rod assembly is assembled as a sub-assembly by connecting the plurality of shift rods in a fixed positional relationship with the support member. After assembling the gear train constituent member to the second shaft, the first and second shafts are combined to assemble the gear assembly, and the shift rod assembly and the gear assembly are assembled. Assembly work can be performed as a unit in which each shift rod is integrated. Therefore, the assembly of the transmission can be greatly simplified, and automation can be easily performed.

In the structure of the transmission according to the present invention as defined in claim 2, a subassembly is formed by having a support portion for supporting each shift rod and a positioning portion for keeping each shift rod in a fixed positional relationship. Since the supporting member is provided, the above assembling method can be achieved.

In this structure, if the supporting member is provided with a detent mechanism as a positioning portion for each shift rod as described in claim 3, a simple structure utilizing the detent mechanism is used at the time of sub-assembly. Can be positioned.

Further, as described in claim 4, the detent mechanism component is accommodated in the detent mechanism accommodating portion projectingly provided on the supporting member to configure the detent mechanism, and at the same time, the detent mechanism is constructed. If the structure in which the detent mechanism accommodating portion projects into the space between the bearing that supports one end of one of the shafts and the synchronizer that is arranged near the one end of the shaft, the above space is used. The detent mechanism can be arranged compactly.

When the support member is provided with an interlock mechanism as described in claim 5, the interlock mechanism can be easily incorporated at the stage of assembling the sub-assembly.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an entire transmission according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional plan view of the transmission.

3 is a cross-sectional view taken along the line III-III in FIG.

FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG.

FIG. 5 is a cross-sectional view of a shift rod arrangement portion.

6 is a cross-sectional view of a shift rod arrangement portion in a direction orthogonal to FIG.

FIG. 7 is an enlarged cross-sectional view of a main part showing details of a detent mechanism.

FIG. 8 is an enlarged cross-sectional view of a main part showing details of an interlock mechanism.

FIG. 9 is a perspective view showing another example of a subframe.

FIG. 10 is a schematic view showing an example of an assembly line for performing the assembly method of the present invention.

FIG. 11 is an explanatory diagram showing a first step of the assembling method.

FIG. 12 is an explanatory diagram showing a step performed after the step of FIG. 11.

FIG. 13 is an explanatory diagram showing a step performed after the step of FIG.

FIG. 14 is an explanatory diagram showing a step performed after the step of FIG.

FIG. 15 is an explanatory diagram showing a step performed after the step of FIG.

16 is an explanatory diagram showing a step performed after the step of FIG.

FIG. 17 is an explanatory diagram showing a step performed after the step of FIG. 16.

FIG. 18 is an explanatory diagram showing a step performed after the step of FIG. 17.

FIG. 19 is an explanatory diagram showing a step performed after the step of FIG.

FIG. 20 is an explanatory diagram showing a step performed after the step of FIG. 19.

[Explanation of symbols]

1 Transmission Case 2 Transmission 41-43 Shift Rod 45 Subframe 50 Detent Mechanism 52 Detent Mechanism Storage 60 Interlock Mechanism AS ₁ Shift Rod Assembly AS ₂ Gear Assembly

Claims (5)

[Claims] 1. A method of assembling a transmission, comprising: first and second shafts having a plurality of gear trains; and a plurality of shift rods having shift forks for axially displacing each gear train. While assembling the shift rod assembly as a sub-assembly by coupling the plurality of shift rods in a fixed positional relationship with a support member, after assembling the gear train constituent members to the first and second shafts, When the corresponding gears are engaged, the first and second
A method for assembling a transmission, comprising assembling a gear assembly by connecting shafts, and assembling the shift rod assembly and the gear assembly in a state in which a shift fork is engaged with a gear train. 2. A transmission comprising: first and second shafts having a plurality of gear trains; and a plurality of shift rods having a shift fork for axially displacing each gear train. A structure of a transmission, comprising: a supporting member that supports the gears and a positioning portion that positions each shift rod in a fixed positional relationship, and a supporting member that forms a subassembly is provided. 3. The structure of the transmission according to claim 2, wherein the support member is provided with a detent mechanism for restricting the movement of each shift rod as a positioning portion for each shift rod. 4. A detent mechanism component is accommodated in a detent mechanism accommodating portion projectingly provided on the support member to configure a detent mechanism, and one end of one of the first and second shafts is The detent mechanism accommodating portion projects into a space existing between the bearing and a synchronizer arranged near one end of the one shaft, the supporting member being arranged on an outer peripheral side of a bearing to be supported. The structure of the transmission according to Item 3. 5. The structure of the transmission according to claim 2, wherein an interlock mechanism for preventing simultaneous movement of the plurality of shift rods is provided between the shift rods of the support member.