JPH10225833A - Assembling method for transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate assembling of an output reduction type transmission and reduce irregularity of tooth contact of a speed reduction gear. SOLUTION: An output shaft assembly 69 is assembled in a transmission case 1 to form a speed changer case subassembly. To the transmission case subassembly, a shaft assembly comprising an input shaft assembly 45 and a counter shaft assembly 46 is assembled. At this time, an end surface of a reduction gear 24o is supported through a positioning jig 72, the shaft assembly is assembled in the condition where a transmission case 1 is positioned to the end surface as a reference surface, and a clutch housing 2 is assembled. After that, an assemblage position is adjusted by a shin, and a front cover is assembled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for assembling a transmission.

[0002]

2. Description of the Related Art A manually operated transmission generally includes an input shaft, an output shaft arranged on the same axis as the input shaft, a counter shaft,
Power transmission switching including a plurality of transmission gear pairs provided in pairs with an input shaft, an output shaft, and a counter shaft corresponding to each gear position and meshing with each other, and a synchromesh device including a shift rod and a shift fork. The mechanism is provided in the transmission case. Conventionally, as a method of assembling such a transmission, conventionally, a method of manually incorporating a plurality of shafts to which gears and the like are attached in advance through an opening on the rear end side of the transmission case while adjusting the phase is generally adopted. Have been.

Further, as a technique for automating the assembling work of a transmission, as shown in Japanese Patent Application Laid-Open No. Hei 8-57723, a plurality of shafts to which transmission gears are attached are combined in a state where the transmission gears mesh with each other. 2. Description of the Related Art Conventionally, there has been known an assembling method of assembling the clutch housing in a lump.

[0004]

A so-called output reduction type transmission in which a reduction gear pair is provided between an output shaft and a counter shaft (for example, described in Japanese Patent Application Laid-Open No. 2-93151). In particular, in the case of a transmission provided with a reduction gear pair near the input end of the output shaft and near the output end of the counter shaft,
Since the rotational torque of the input shaft is transmitted to the countershaft without being amplified, the input load on each transmission gear is small, but the input load on the reduction gear is correspondingly large. Management is important. However, when assembling the output reduction type transmission with the conventional assembling method described above, the front end of the input shaft is used as a reference, and shim adjustment or the like is performed at the rear end (output side) of the output shaft and the counter shaft. Therefore, it is difficult to manage the contact of the reduction gear. Accordingly, there is a possibility that the gear contact of the reduction gear varies in the axial direction, thereby causing a problem that gear noise occurs.

Accordingly, it is an object of the present invention to provide a method of assembling a transmission that can reduce variations in the contact of the reduction gears of an output reduction type transmission.

[0006]

According to a first aspect of the present invention, there is provided a transmission assembling method, wherein an output shaft provided with a reduction gear is assembled to an output side casing member of a transmission, and an input shaft and a counter shaft are attached to the output shaft. Assemble multiple transmission gear pairs excluding reduction gears,
In a state where the casing member is positioned with the end face of the reduction gear assembled to the output shaft as a reference plane, with respect to these output shaft and the casing member,
The input shaft and the counter shaft are assembled.

According to the above-described method of assembling the transmission, the input shaft and the counter shaft are assembled to the casing member by assembling the input shaft and the counter shaft with the casing member positioned with the end face of the reduction gear of the output shaft as the reference plane. In contrast, since it can be assembled at an accurate position, and can also be assembled at an accurate position with respect to the output shaft, the variation in tooth contact between the reduction gear attached to the predetermined position of the counter shaft and the reduction gear of the output shaft can be reduced. Can be reduced.

According to a second aspect of the present invention, there is provided a transmission assembling method according to the first aspect, wherein the output shaft is assembled to the casing member to form a first assembly member, and the input shaft and the counter shaft are decelerated. A plurality of speed change gear pairs except for the gears are assembled, and the input shaft and the counter shaft are assembled in a state where the gears of the speed change gear pair mesh with each other.
By assembling the second assembly member with the first assembly member, the input shaft and the counter shaft are assembled with the output shaft and the casing member. By sub-assembling the output side and the input side in this way, the assembling work of the transmission is facilitated and the automatic assembling is also facilitated.

According to a third aspect of the present invention, there is provided the transmission assembling method according to the first or second aspect, wherein the input shaft and the counter shaft are assembled to the output shaft and the casing member on the output side. And a casing member on the input side of the transmission. By assembling the casing member on the input side in this way, the positions of the input shaft and the counter shaft are reliably defined.

According to a fourth aspect of the present invention, there is provided a transmission assembling method according to the first aspect, wherein the plurality of shift rods are sub-assembled with respect to the input shaft and the counter shaft and assembled to the output-side casing member. Things. By assembling the shift system in this way when assembling the input shaft and the counter shaft with the casing member positioned with the end face of the reduction gear of the output shaft as the reference plane, the shift system can be easily positioned in the gear train. According to a fifth aspect of the present invention, there is provided the transmission assembling method, wherein the end surface of the casing member is supported by the support member in a state where the output shaft is assembled to the output-side casing member. The casing member is positioned by supporting the end face of the reduction gear by a positioning jig assembled to the member. With such an arrangement of the support member and the jig, it is possible to easily position the casing member with the end surface of the reduction gear of the output shaft as a reference plane.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 9 show an example (Example 1) of an embodiment of the present invention. This example shows the so-called FR
This is applied to a transmission with five forward steps and one reverse step, which is mounted on a model car. FIG. 1 shows the configuration of the transmission. In the figure, 1 is a transmission case, 2 is a transmission case 1
Is a clutch housing connected to the front end of the clutch housing. Reference numeral 3 denotes an extension housing connected to the rear end of the transmission case 1, 4 denotes an input shaft, 5 denotes a counter shaft, 6 denotes an output shaft, 7A, 7
B and 7C are shift rods. And 8, 9, 10
Is a shift fork.

The input shaft 4 has its input side (front end side: left end side in FIG. 1) connected to an engine output shaft (not shown) via a clutch (not shown), and has an output side (rear end side: The right end in FIG. 1 is combined with the input end (front end) of the output shaft 6 arranged rearward on the same axis. The output side (rear end side: right end side in FIG. 1) of the output shaft 6 is connected to a propeller shaft (not shown) that transmits driving force to the rear wheel side. Further, the rear end of the clutch housing 2 adjacent to the input side end (front end) of the transmission case 1 has a shaft support wall 11 at the input side end on the front inner side with respect to the connection surface with the transmission case 1. The central portion of the input shaft 4 is rotatably supported by a bearing wall 11 via a bearing 12, and the front end of the counter shaft 5 is rotatably supported by a bearing 13 via a bearing 13. Shift rod 7A,
The front ends of 7B and 7C are supported so as to be able to move back and forth.
A front cover 14 is attached so as to cover each of the shaft support portions and the support portions of the shaft support wall 11 from the front end side. A shaft support wall 15 is provided at the rear end of the transmission case 1, and the front end of the output shaft 6 is rotatably supported on the shaft support wall 15 via a bearing 16. The rear end is a bearing 17
, And the center of three shift rods 7A, 7B, 7C is supported movably back and forth.

The above-mentioned transmission is provided with a pair of input shafts 4 and counter shafts 5 corresponding to the respective shift speeds, and is provided with a total of six sets of transmission gears for the first to fifth speeds and the reverse gear meshing with each other. And a power transmission path for transmitting power from the input shaft 4 to the output shaft 6 via the counter shaft 5 or directly to the output shaft 6 by a predetermined transmission gear pair corresponding to the selected gear position. As the power transmission switching mechanism for switching, a total of three synchromesh devices including a 1-2 speed switching synchro 31, a 3-4 speed switching synchro 32, and a 5th speed-R switching synchro 33 are provided.

The first speed gear pair 21 includes a fixed gear 21i on the input shaft 4 and an idle gear 21c on the counter shaft 5. Also, the second speed gear pair 22
It comprises a fixed gear 22i on the input shaft 4 and an idle gear 22c on the counter shaft 5. Also, 3
The speed gear pair 23 includes an idle gear 23i on the input shaft 4 and a fixed gear 23c on the counter shaft 5. The fourth gear pair 24 includes a counter reduction gear (fixed gear) 24 c provided near the rear end (output side end) of the counter shaft 5 and a front end (input side end) of the output shaft 6. A reduction gear (fixed gear) 24o provided in the vicinity constitutes a reduction gear pair. The fifth speed gear pair 25 includes a fixed gear 25i on the input shaft 4 and an idle gear 25c on the counter shaft 5. Further, the reverse gear pair 26 is connected to the fixed gear 26 on the input shaft 4.
i and an idle gear 26c on the counter shaft 5, and the fixed gear 26i and the idle gear 26c mesh with each other via a reverse idle gear (shown in FIGS. 3 to 5 described later) on a reverse idle shaft. It is a thing.

The six gear pairs 21 to 26 are formed by combining a fifth speed gear pair 25 and a reverse gear pair 26 to form a 5-R
The first gear pair 21 and the second speed gear pair 22 are combined to form a 1-2 gear unit, and the third speed gear pair 23 and the fourth speed gear pair 24 are combined. Combined to form a 3-4 gear unit, the 5-R gear unit, 1-2 gear unit, 3-4 gear unit are arranged in this order from the input side (front side), and each gear pair 21-26. From the input side (front side), 5th gear pair 2
5, a reverse gear pair 26, a first speed gear pair 21, a second speed gear pair 22, a third speed gear pair 23, and a fourth speed gear pair 24 are arranged in this order.

The 5-R gear unit including the 5-speed gear pair 25 and the reverse gear pair 26 has a 5-speed gear unit.
An R switching synchro 33 is provided, and the 1-2 speed switching synchro 31 is provided for a 1-2 gear unit including a first speed gear pair 21 and a second speed gear pair 22. The 3-4 gear unit gear unit including the third speed gear pair 23 and the fourth speed gear pair 24 has
A 4-speed switching synchro 32 is provided. The configurations of these synchromesh devices are known per se.

The transmission is assembled by an assembly line shown in FIG. In this assembly line, a speed change gear and the like are incorporated into an input shaft 4, a counter shaft 5, and a reverse idle shaft to form an input shaft assembly, a counter shaft assembly, and a reverse idle shaft assembly, respectively, and these assemblies are combined to form a shaft assembly. Shaft assembly sub line 4
1, a transmission case assembly sub-line 42 for assembling the output shaft 6 with the transmission case 1 to form a transmission case sub-assembly, and receiving the transmission case sub-assembly from the transmission case assembly sub-line 42; Shaft assembly
Upon receiving the supply of the shaft assembly from the sub line 41, the shaft assembly is assembled to the transmission case sub-assembly, then the clutch housing 2 and the like are assembled, and then the front cover is assembled, and the gear train assembly thus formed is turned upside down. Then, a main assembly line 43 for assembling a counter reduction gear and the like, and assembling the extension housing 3 to complete a main part of the transmission, and a shaft assembly transfer device 44 having a pair of moving heads 44a and 44b are constituted. ing.

The above-mentioned shaft assembly sub-line 4
Reference numeral 1 denotes an input shaft 4, a counter shaft 5, and a reverse idle shaft, each of which includes a transmission gear and members of a synchromesh device (shift rods 7A, 7B, 7C and shift forks 8, 9, 10), and as shown in FIG. 4, they are spaced apart from each other as an input shaft assembly 45, a counter shaft assembly 46, and a reverse idle shaft assembly 47, It is set on the shaft subline pallet 48 in the form of a shaft assembly. Then, the shaft subline pallets 48 on which the respective shaft assemblies are set are sequentially transferred, and the shaft assemblies on the transferred shaft subline pallets 48 are held by the first moving head 44a of the shaft assembly transfer device 44. Then, it is transferred to the shaft combination device 49 disposed at the end of the shaft assembly subline 41.

As shown in FIG. 5, the shaft combination device 49 is a movable first holder for holding the input shaft assembly 45 in an upright position with the input side facing upward on the lower support base 50. 51 and a fixed second holding the counter shaft assembly 46 in a vertical position.
And a movable third holder 5 for holding the reverse idle shaft assembly 47 in a vertical position.
3, the first holder 51 can be moved and driven to the second holder 52 side via the cylinder 54, and the third holder 53 is also connected to the second holder 52 side via the cylinder 55. It can be driven to move. Above the lower support table 50, an upper support table 56 that can move in the horizontal direction is arranged, and the upper support table 56 can be driven to move vertically by a support member 57 via a cylinder (not shown). Is provided. The electric motor 5 is mounted on the support member 57.
8, a connecting rod 59 connected to the rotating shaft of the electric motor 58 extends downward, and a connecting cylinder 60 extending downward at the lower end of the connecting rod 59 is urged downward via a spring member 61. The connecting tube 6
At the lower end of 0, a socket 62 is provided which can be fitted to the upper end of the shaft (input shaft 4) of the input shaft assembly 45. The support member 57, the electric motor 58, the connecting rod 59, the connecting cylinder 60, the spring member 61 and the socket 62 constitute a gear meshing device.

In the shaft combination device 49,
The support member 57 is driven to move downward, and the socket 62 is externally mounted on the upper end of the shaft (input shaft 4) of the input shaft assembly 45, and the electric motor 5
8, while the input shaft assembly 45 is driven to rotate at a low speed, the upper support 56 is driven to move in the horizontal direction by a cylinder (not shown).
4, the input shaft assembly 45 is moved through the first holder 51 to the counter shaft assembly 46.
The reverse idle shaft assembly 47 is driven by the cylinder 55 via the third holder 53 to move the countershaft sub-assembly 46, and the phases of these assemblies 45, 46, 47 are matched. Are combined. Then, in this state, the shift rods 7A, 7B, 7C and the shift forks 8, 9, 10 are assembled.

The transmission case assembly sub-line 42 is provided in such a manner that the transmission case supply device 63 sets the transmission case 1 on the main line pallet 64 and the transmission case 1 set on the main pallet 64 The output shaft supply device 65 supplies the output shaft 6, and the transmission case sub-assembly assembly device 66 assembles bearings, reduction gears 24o and the like as shown in FIG. The bearing press-fitting device 68 is driven upward from below while being backed up by the device 67, and the output shaft 6 is attached to the transmission case 1.
And a bearing portion of the output shaft assembly 69 including the reduction gear 24o and the like are press-fitted and fixed to form a sub-assembly (transmission case sub-assembly). A main line pallet 64 on which the transmission case sub-assembly (an assembly of the transmission case 1 and the output shaft assembly 69) is set.
Are sequentially transferred to the main assembly line 43.

The main assembly line 43 is installed in series with the shaft assembly sub-line 41. The transmission case assembly sub-line 42 is provided at the end on the upstream side (left side in FIG. 2) of the line.
Supplies a main line pallet 64 in which the transmission case sub-assembly (an assembly of the transmission case 1 and the output shaft assembly 69) is sequentially set, and a shaft composed of a combination of the above-described assemblies 45, 46, 47 The assembly is transferred from the shaft combination device 49 onto the main line pallet 64 by the second moving head 44b of the shaft assembly transfer device 44, as shown in FIG. It is assembled to the machine case sub-assembly and transported together with the main line pallet 64 as an assembly.
Then, the clutch housing 2 supplied from the housing supply line Lc is supplied to the clutch housing assembling device 71 by the housing transfer device 70, and the clutch housing assembling device 71 transfers the clutch housing 2 onto the main line pallet 68 as shown in FIG. The clutch housing 2 is assembled to the above assembly.

The main line pallet 64 supports the output side end face of the transmission case 1 from below.
4a. A jig receiving portion 64b is provided inside the support portion 64a in a stepped manner. After attaching the output shaft assembly 69 to the transmission case 1 supported on the support portion 64a of the main line pallet 64 with the output side end face down, the output shaft assembly 69 is attached to the jig receiving portion 64b as shown in FIG. Positioning jig 7
2 is set, and the output side end surface of the reduction gear 24o of the output shaft assembly is supported by the positioning jig 72. By doing so, the transmission case 1 is set with the end face of the reduction gear 24o as the reference plane.
Is positioned.

As shown in FIG. 6, the second moving head 44b of the shaft assembly transfer device 44 suspends the shaft assembly with the output side down, and the transmission case subassembly (the transmission case 1 and the transmission case 1). When the transmission case 1 is positioned with the end surface of the reduction gear 24o as a reference surface and held by the main line pallet 64, the shaft assembly is assembled to the transmission case sub-assembly.

The clutch housing assembling device 71
As shown in FIG. 7, a pair of upper and lower support members 74 and 75 are provided on a frame 73 so as to be vertically movable via a cylinder (not shown). The pair of support members 74 and 75 are driven to move downward while sandwiching the clutch housing 2. Then, the clutch housing 2 is assembled to the assembly of the shaft assembly and the transmission case sub-assembly on the main line pallet 64, and the bearings 76 and 77 are press-fitted. In this manner, the clutch housing 2 is assembled by the clutch housing assembling device 71, whereby the assembly position of the shaft assembly is reliably defined.

In the main assembly line 43, the assembly in which the clutch housing 2 is assembled by the clutch housing assembling device 71 is
An operator attaches the front cover 14. It should be noted that the front cover 14 is assembled after final adjustment of the assembly position by the shim 78 (see FIG. 8). Then, the gear train, to which the front cover 14 has been assembled, is inverted by 180 ° by the reversing device 79 as shown in FIG. 8, the counter reduction gear 24c and the like are assembled, and the clutch housing 2 is turned upright again. It is set on the main line pallet 64.

As shown in FIG. 8, the reversing device 79 includes:
A rotatable plate 81 is provided at the front end of a rotatable shaft member 80, and a pair of upper and lower support members 82, 83 is provided on the front surface of the rotatable plate 81 via a cylinder (not shown) so as to be movable. . The shaft member 80 includes:
It is rotatably supported by a support table (not shown) and is reciprocally driven by 180 ° by an electric motor (not shown).

The gear train 180 ° inverted by the reversing device 79 is provided with the main line pallet 64 in a vertical position with the clutch housing 2 down and the output side up.
Set on top and transport. Then, the extension housing 3 is assembled by an operator.

FIG. 9 is a block diagram showing a method of assembling a transmission using the above-mentioned assembly line. Next, the steps of this assembling method will be described in the order of steps.

[Step 1] Transmission case assembly
In the sub-line 42, the transmission case 1 is set on the main line pallet 64, the output shaft 6 is supplied, the bearing, the reduction gear 24o, etc. are assembled, and the output shaft assembly 69 including the output shaft 6, the bearing, the reduction gear 24o, etc. The transmission case 1 is assembled to the transmission case 1 to form a transmission case sub-assembly (see FIG. 3), and is transferred to the main assembly line 43.

[Step 2] In the shaft assembly sub-line 41, the input shaft 4, the counter shaft 5, and the reverse idle shaft are assembled with a transmission gear and the like to form an input shaft assembly 45, a counter shaft assembly 46, and a reverse idle shaft assembly 47, respectively. Then, they are set at intervals on the shaft subline pallet 48 (see FIG. 4).

[Step 3] The shaft assembly including the assemblies 45, 46 and 47 on the shaft subline pallet 48 is transferred to the shaft combination device 49 by the shaft assembly transfer device 44.

[Step 4] The assemblies 45, 46, and 47 are combined in the desired positional relationship by adjusting the phases by the shaft combining device 49.
A, 7B, 7C and shift forks 8, 9, 10 are assembled to form a shaft assembly (see FIG. 5).

[Step 5] Main assembly line 4
At 3, the transmission case 1 of the transmission case sub-assembly is positioned on the main line pallet 64 with the end face of the reduction gear 24o as a reference surface, and the shaft assembly is transferred from the shaft combination device 49 onto the main line pallet 68. And the transmission case sub-assembly (see FIG. 6).

[Step 6] Assemble the clutch housing 2 (see FIG. 7).

[Step 7] The assembling position is finally adjusted by shims, and the front cover 14 is assembled.

[Step 8] The gear train to which the front cover 14 is assembled is turned upside down by 180 ° by the reversing device 79, and the counter reduction gear 24c. , Bearings and the like are assembled (see FIG. 8).

[Step 9] The clutch housing 2 is set on the main line pallet 64 with the clutch housing 2 facing down and the output side facing upward.

[Step 10] The extension housing 3 is assembled.

FIGS. 10 to 14 show an example (example 2) of an embodiment applied to another transmission having a different configuration. This transmission is a five-speed forward and one-reverse one-speed transmission which is also mounted on an FR-type vehicle with an engine mounted vertically. As shown in FIG. 10, a transmission case 101A integrally formed with a clutch housing portion is provided. , A bearing housing 101B connected to the output side end of the transmission case 101A.
, A center housing 101C connected via a bearing housing 101B and an extension housing 103 on the rear end side constitute a casing, and the casing includes shafts such as an input shaft 104, a counter shaft 105, and an output shaft 106. It constitutes a gear train.

The input shaft 104 has its input side (front end side: left end side in FIG. 10) connected to an engine output shaft (not shown) through a clutch (not shown).
The output side (rear end side: right end side in FIG. 1) is combined with the input side end (front end) of the output shaft 106 arranged on the same axis rearward. The output side (rear end side: right end side in FIG. 1) of the output shaft 106 is connected to a propeller shaft (not shown) that transmits driving force to the rear wheel side. Further, the transmission case 101
A has a support wall 111 at the input side end in the center of the inside, and the center of the input shaft 104 is rotatably supported by the support wall 111 via a bearing 112, and the front end of the counter shaft 105. Are rotatably supported via bearings 113, and the front end of a shift rod (not shown) is supported so as to be able to move back and forth. A front cover 114 is attached so as to cover each of the shaft support portions and the support portions of the shaft support wall 111 from the front end side. The rear end of the input shaft 104 is rotatably supported by a bearing housing 101B provided at the rear end of the transmission case 101 via a bearing 116, and the intermediate portion of the counter shaft 105 is supported by a bearing 117 via a bearing 117. The center part of three shift rods (not shown) is supported so as to be able to move back and forth. Further, the rear end of the center housing 101C forms a pivot wall 118, on which the front end of the output shaft 106 is rotatably supported via a bearing 119, and the rear end of the counter shaft 105. The parts are rotatably supported via bearings 120, and the rear ends of three shift rods (not shown) are supported so as to be able to move back and forth. Bearing housing 1
01B, a bearing cover 140a for holding the bearings 116 and 117 of the input shaft 104 and the counter shaft 105 is provided at the rear end.
A bearing cover 140 that holds the bearings 119 and 120 of the output shaft 106 and the counter shaft 105 is provided at the rear end of the center housing 101C.
c and a lock nut 141 are provided. Also,
A speedometer gear 142 is attached to the center of the output shaft 106 in the axial direction.

The transmission has an input shaft 104 and a countershaft 10 corresponding to each gear position.
And a total of six sets of speed change gear pairs 121 to 126 for the first to fifth speeds and for retreating which are provided in pairs with the fifth and fifth gears,
Further, the input shaft 104 and the countershaft 10 are driven by a predetermined gear pair corresponding to the selected gear position.
As a power transmission switching mechanism for switching the power transmission path so that power is transmitted to the output shaft 106 via the transmission gear 5 or directly, the 1-2 speed switching synchro 131,3-
It is provided with a total of three synchromesh devices, a 4-speed switching synchro 132 and a 5-speed-R switching synchro 133.

The first speed gear pair 121 is composed of a fixed gear 121i on the input shaft 104 and the countershaft 10
5 is comprised of an idle gear 121c. The second gear pair 122 includes a fixed gear 122i on the input shaft 104 and an idle gear 12
2c. Further, the third speed gear pair 123 includes an idle gear 123i on the input shaft 104 and a fixed gear 123c on the counter shaft 105. Further, the fourth speed gear pair 124 is a counter shaft 1
05, a counter reduction gear (fixed gear) 124c provided near the rear end (output side end), and a reduction gear (fixed gear) 124o provided near the front end (input side end) of the output shaft 106. And constitute a reduction gear pair. In addition, 5 speed gear pair 1
25 is a fixed gear 125 on the input shaft 104
i and an idle gear 125c on the counter shaft 105. The reverse gear pair 126 is composed of a fixed gear 126i on the input shaft 104 and an idle gear 126c on the counter shaft 105. The fixed gear 126i and the idle gear 126c are connected to the reverse idle shaft on the reverse idle shaft. They are meshed via gears (not shown).

The six gear pairs 121 to 126 constitute a 5-R gear unit by combining the fifth speed gear pair 125 and the reverse gear pair 126, and include the first speed gear pair 121 and the second speed gear pair 121. The gear pair 122 is combined to form a 1-2 gear unit, and the third speed gear pair 123 and the fourth speed gear pair 124 are combined to form a 3-4 gear unit. From the (front side), the 5-R gear unit, the 1-2 gear unit, and the 3-4 gear unit are arranged in this order, and each gear pair 121 to 126 is connected to the input side (front side).
From the fifth gear pair 125, the reverse gear pair 126, the first gear pair 121, the second gear pair 122, and the third gear pair 1.
The 23rd and 4th gear pairs 124 are arranged in this order.

The 5-R gear unit including the fifth speed gear pair 125 and the reverse gear pair 126 has the above-mentioned 5th gear unit.
A speed-R switching synchro 133 is provided. The 1-2 speed switching synchro 131 is provided for a 1-2 gear unit including a first speed gear pair 121 and a second speed gear pair 122. The 3-4 gear changeover synchro 132 is provided for a 3-4 gear unit gear unit composed of the 3rd gear pair 123 and the 4th gear pair 124. The configurations of these synchromesh devices are known per se.

In this example, the transmission is assembled in the following steps in an assembling line using the same apparatus as in the examples shown in FIGS.

[Step 1] Center housing 101C
, The output shaft 106 is assembled, the bearing 119 is press-fitted, and the cover 140c is assembled. Then, the speedometer gear 142 is assembled to the output shaft 106 (see FIG. 11).

[Step 2] The input shaft 104,
A third speed gear pair 123, a 3-4 speed switching synchro 1 are provided on the counter shaft 105 and the reverse idle shaft.
32 and the gears other than the counter reduction gear 124c are incorporated into the input shaft assembly 145 and the counter shaft assembly 14 respectively.
6 and reverse idle shaft assembly,
These assemblies are combined in phase and in a desired positional relationship, and further, a shift rod and a shift fork are assembled to form a shaft assembly. Then, the shaft assembly is assembled into the bearing housing 101B, the bearings 116 and 117 are press-fitted, and the bearing covers 140a and 140b are assembled. Thereafter, the third speed gear 123i on the input shaft 104 side and the 3-4 speed switching synchro 132 are assembled, and then the third speed gear 12
3c, the counter reduction gear 124c, the bearing 120, and the lock nut 141 (see FIG. 12).

[Step 3] The output shaft / center housing assembly A formed in step 1 is held in an upright position with the input side facing upward, and the gear train assembly G formed in step 2 is assembled. At this time, the position of the reduction gear 124o is defined by supporting the end face of the inner race of the bearing 119 from below by a positioning jig (see FIG. 13).

[Step 4] The assembly of the output shaft / center housing assembly A and the gear train assembly G is held in an upright position with the input side up, and the position of the reduction gear 124o is defined to thereby reduce the position of the reduction gear 124o. The transmission case 101A is assembled in a state where the center housing 101C is positioned with the end face of the front cover 114C as a reference plane.
Assemble. Then, the extension housing 103 is installed upside down by 180 ° and held in a vertical position with the output side facing upward. Finally, the control case assembly C is assembled (see FIG. 14).

The present invention is not limited to the above embodiment, but can be applied to various output reduction type transmissions.

[0053]

According to the present invention, it is easy to assemble the output reduction type transmission, and the reduction in the tooth contact of the reduction gear is reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a transmission according to an example (Example 1) of an embodiment.

FIG. 2 is a layout diagram of an assembly line of Example 1.

FIG. 3 is an explanatory diagram of an assembling step 1 of Example 1.

FIG. 4 is an explanatory view of an assembling step 3 of the transmission of Example 1.

FIG. 5 is an explanatory view of an assembling step 5 of the transmission of Example 1.

FIG. 6 is an explanatory diagram of an assembling step 7 of the transmission of Example 1.

FIG. 7 is an explanatory diagram of an assembling step 8 of the transmission of Example 1.

FIG. 8 is an explanatory diagram of an assembling step 9 of the transmission of Example 1.

FIG. 9 is a block diagram of an assembling method of Example 1.

FIG. 10 is a longitudinal sectional view of a transmission according to another example (Example 2) of the embodiment.

FIG. 11 is an explanatory view of an assembling step 1 of Example 2;

FIG. 12 is an explanatory diagram of an assembling step 2 of the transmission of Example 2.

FIG. 13 is an explanatory diagram of an assembly process 3 of the transmission of Example 2.

FIG. 14 is an explanatory diagram of an assembly process 4 of the transmission of Example 2.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Transmission case 2 Clutch housing 4 Input shaft 5 Counter shaft 6 Output shaft 7A, 7B, 7c Shift rod 8, 9, 10 Shift fork 14 Front cover 21, 22, 23, 24, 25, 26 Transmission gear pair 24o Reduction gear 24c Counter reduction gear 41 Shaft assembly / sub line 42 Transmission case assembly / sub line 43 Main assembly line 64 Main line pallet 72 Positioning jig 101A Transmission case 101B Bearing housing 101C Center housing 103 Extension housing 104 Input shaft 105 Counter shaft 106 Output shaft 114 Front cover 121,122,123,124 125,126 shift gear pair 124o reduction gear 124c counter reduction gear

Claims (5)

[Claims] 1. A transmission having an input shaft, an output shaft, and a counter shaft, wherein a reduction gear pair is provided near an input end of the output shaft and near an output end of the counter shaft. In the assembling method, an output shaft provided with one gear of the reduction gear pair is assembled to an output-side casing member of a transmission, and a plurality of transmission gear pairs excluding a reduction gear are assembled to the input shaft and the counter shaft. With the casing member positioned with the end face of the reduction gear assembled to the output shaft as a reference surface, the input shaft and the counter shaft having the plurality of speed change gear pairs are assembled to the output shaft and the casing member. And a method of assembling a transmission. 2. The output shaft is assembled to the casing member to form a first assembly member. The input shaft and the counter shaft are assembled with a plurality of transmission gear pairs excluding the reduction gear, and the input shaft and the counter are assembled. The output shaft and the output shaft are assembled by assembling a shaft in a state where the respective gears of the transmission gear pair mesh with each other to form a second assembly member, and assembling the second assembly member with the first assembly member. The transmission assembling method according to claim 1, wherein the input shaft and the counter shaft are assembled to a casing member. 3. The casing member on the input side of the transmission after assembling the input shaft and the counter shaft to the output shaft and the casing member.
Or the method of assembling the transmission according to 2. 4. The method for assembling a transmission according to claim 1, wherein a plurality of shift rods are sub-assembled with respect to the input shaft and the counter shaft and assembled to the casing member. 5. An end face of the casing member is supported by a support member in a state where the output shaft is assembled to the casing member, and an end face of the reduction gear is supported by a positioning jig assembled to the support member. The method for assembling a transmission according to claim 1, wherein the casing member is positioned.