JPH09264403A - Transmission gear and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the assembly of a reverse idle gear to improve working efficiency. SOLUTION: After an input shaft 3, a counter shaft and an output shaft are assembled into a case member 2 to accommodate them, an another support member 100 where an idle gear 102 to be engaged with a pair of transmission gears on a backward stage among plural pairs of transmission gears is previously assembled is built into a case member 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission and a method of manufacturing the same, and more particularly, to a transmission and a manufacturing method thereof in which a reverse idle gear that meshes with reverse gears of an input shaft and a counter shaft is retrofitted to a transmission case. It is about the method.

[0002]

2. Description of the Related Art Conventionally, in a manual transmission,
In order to reverse the output shaft and achieve the reverse stage, the reverse idle gear is engaged with the reverse drive gear of the input shaft and the reverse counter gear of the counter shaft to reverse the rotation of the counter shaft by the reverse idle gear.

This reverse idle gear is disclosed in
As disclosed in Japanese Patent No. 27338, it is rotatably supported by a support portion integrally formed with the transmission case.

[0004]

By the way, when the reverse idle gear is pivotally supported by the support portion formed integrally with the transmission case as in the above-mentioned prior art, the reverse idle gear is not supported. It is necessary to assemble at the same time as each gear train, shift rod, shift fork, etc. arranged on the input shaft and the counter shaft, and in the state of meshing with the reverse input gear and the reverse counter gear,
Assembleability is poor and work efficiency is unavoidable.

The present invention was proposed in order to solve the above-mentioned drawbacks of the prior art. The object of the present invention is to make it possible to easily assemble a reverse idle gear and improve work efficiency, and a method of manufacturing the same. To provide.

[0006]

In order to solve the above problems and achieve the object, the transmission of the present invention has the following structure. That is, the input shaft (3), an output shaft (5) concentrically provided with the input shaft (3) and rotatably provided independently of the input shaft (3), and the input shaft (3). ) And a counter shaft (4) arranged in parallel to the output shaft (5) and transmitting the rotational force of the input shaft (3), and each of the shafts (3, 4, 5).
A plurality of transmission gear pairs (6,
7,8,9,10,12,13,14,15,16) is operated by the shift lever operation (3
4) by selecting via the synchronizer (18, 19, 20) the rotational force of the input shaft (3) to the counter shaft (4).
In the transmission device for transmitting to the output shaft (5) through the plurality of transmission gear pairs (6, 7, 8, 9, 10, 12, 1)
3, 14, 15, 16), the idle gear (102) meshed with the reverse speed change gear pair (7, 13)
The input shaft (3), the counter shaft (4), and the output shaft (5) are supported by a supporting member (100) provided separately from the case member (2).

Further, the method of manufacturing the transmission according to the present invention has the following features. That is, the input shaft (3), an output shaft (5) concentrically provided with the input shaft (3) and rotatably provided independently of the input shaft (3), and the input shaft (3). ) And a counter shaft (4) which is arranged parallel to the output shaft (5) and transmits the rotational force of the input shaft (3), and is provided on each of the shafts (3, 4, 5). , A plurality of transmission gear pairs (6, 7, 8, 9, 10, 12, 13, 14, 1 that mesh with each other).
(5, 16) of the transmission gear pair is selected by the shift lever operation (34) via the synchronizer (18, 19, 20), the rotational force of the input shaft (3) is changed to the counter shaft ( 4) A method for manufacturing a transmission in which the transmission is transmitted to the output shaft (5) via the plurality of transmission gear pairs (6, 7,
8, 9, 10, 12, 13, 14, 15, 16), which is a separate support member (100) in which an idle gear (102) to be meshed with a reverse speed change gear pair (7, 13) is incorporated in advance. The input shaft (3), the counter shaft (4),
After being assembled to the case member (2) that houses the output shaft (5), it is assembled to the case member (2).

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment will be described in which the transmission of the vehicle of the present invention is applied to a transmission of a vehicle having a manual transmission.

<Overall structure of transmission>
The overall structure of the transmission according to the embodiment of the present invention will be described. FIG. 1 is a side sectional view showing an overall structure of a transmission according to an embodiment of the present invention.
FIG. 2 is an upper cross-sectional view showing a mounting position of the reversing mechanism in the transmission case.

In FIG. 1, a transmission 1 is a manual transmission type rear-wheel drive manual transmission, and in a transmission case 2 of the transmission 1, an input shaft 3 and a counter shaft 4 arranged in parallel in the vertical direction are provided. Are rotatably supported by bearings 50 to 54 provided in the. Further, at the rear end of the input shaft 3, that is, at the output side, an output shaft 5 having the same rotation axis as that of the input shaft 3 is slidably fitted and pivotally supported by bearings 54 and 55. The input shaft 3 includes a fifth speed input gear 6, a reverse input gear 7, a first speed input gear 8, a second speed input gear 9, and 3 in order from the input side.
A speed input gear 10 is provided, and the gears 6 to 10 are integrally formed with the input shaft 3 or meshed with splines to rotate with the input shaft 3. The counter shaft 4 is provided with a fifth speed counter gear 12, a reverse counter gear 13, a first speed counter gear 14, a second speed counter gear 15, and a third speed counter gear 16 rotatably with respect to the counter shaft 4 from the input side. The fourth speed counter gear 17 is meshed with the counter shaft 4 by a spline and rotates together with the counter shaft 4. Output gear 5 has 4 speed drive gear 1
1 is formed integrally or meshed with a spline and rotates with the output shaft 5.

A fifth speed input gear 6 and a fifth speed counter gear 12, a first speed input gear 8 and a first speed counter gear 14,
The second speed input gear 9 and the second speed counter gear 15, the third speed input gear 10 and the third speed counter gear 16, the fourth speed input gear 11 and the fourth speed counter gear 17 are meshed with each other, and the output shaft 5 is a fourth speed input gear. The gear 11 and the fourth speed output gear 17 mesh with each other to rotate together with the counter shaft 4.

On the other hand, the reverse input gear 7 of the input shaft 3 meshes with a reverse idle gear described later, and the reverse idle gear is the reverse counter gear 1.
By engaging with 3, the rotation of the input shaft 3 is reversed and transmitted to the counter shaft 4.

As mentioned above, this transmission 1
Is a so-called output, in which the counter shaft 4 and the output shaft 5 are constantly meshed with each other, and a rotational speed is transmitted from the input shaft 3 to the output shaft 5 via the counter shaft 4 when a certain gear is connected. It is a reduction type.

Between the fifth speed counter gear 12 and the reverse counter gear 13 on the counter shaft 4, 5
The -R shift synchronizer 18 is meshed by a spline so as to rotate together with the counter shaft 4. Similarly,
Between the first speed counter gear 14 and the second speed counter gear 16 on the counter shaft 4, a 1-2 shift synchronizer 19 is engaged by a spline so as to rotate together with the counter shaft 4. Further, between the 3rd speed input gear 10 and the 4th speed drive gear 17 on the input shaft 3, a 3-4 shift synchronizing device 20 is meshed by a spline so as to rotate together with the input shaft 3.

The 5-R gear shift synchronizer 18 and the 1-2 gear shift synchronizer 19 mesh with a clutch hub that meshes with the counter shaft 4 and with this clutch hub 8 and slide in the axial direction by a shift fork 33 described later. A sleeve capable of engaging with a gear chamfer of one of the counter gears 4 arranged on both sides of the synchronizers 18 and 19, respectively, so that the rotation of the input shaft 3 is transmitted through the counter gear of the shift stage. Is transmitted to the counter shaft 4.

Here, the 5-R shift synchronizer 18, 1-2
The speed change synchronization device 19 is provided on the counter shaft 4 side for the following reason.

That is, if the synchronizers 18 and 19 are provided on the input shaft 3 side, the reverse input gear 7 and the 1st speed input gear, which are gears rotatable relative to the shaft, are provided due to the structural characteristics of the output reduction type. The rotation speed of the gear 8 and the second speed input gear 9 becomes high (especially in the fifth speed stage, the rotation speed of the counter shaft is increased by the fifth speed counter gear, and further, the reverse speed, the first speed,
Since the speed is increased by the second speed counter gear, the rotation speeds of the reverse input gear 7, the first speed input gear 8, and the second speed input gear 9 are very high), and the relative speed between the gears 7 to 9 and the input shaft 3 is relatively high. Since the difference in rotation speed becomes large, there is a great concern about image sticking during synchronization.

Therefore, as in this embodiment, the synchronization device 1
By providing 8 and 19 on the counter shaft 4 side, the rotational speeds of the reverse counter gear 13, the first speed counter gear 14, and the second speed counter gear 15, which are rotatable relative to the counter shaft 4, are reduced, and the counter shaft 4 Since it is always immersed in the mission oil in the mission case, the lubricity can be improved.

In the mission case 2, the connecting rod 3
A control rod 30 is provided to which the operating force from the shift lever 34 is transmitted via 3 and the joint 32. The connecting rod 33 is connected to the shift lever 34, and the spherical portion 3 is operated by the driver operating the shift lever.
It is supported in the mission case so that it can be tilted in the front-rear direction and the left-right direction of the vehicle with 3a as the pivot center. The control rod 30 is slidably supported on the mission case 2 above the input shaft 3 and is centered on its own axis by the action of the connecting rod 33 in the left-right direction (the normal direction to the paper surface of FIG. 1). It is rotatably supported. Control rod 30
A joint arm 31 extending downward is fixed to the boss portion 31a. Joint arm 31
Is engaged with the reversing mechanism 40 and transmits the movement of the control rod 30 in the front-rear direction and the rotating direction to the reversing mechanism 40. The reversing mechanism 40 includes a reversing member 41 that is rotatably supported by a support shaft 42 provided in the left and right direction inside the mission case 2 and is also slidably supported along the longitudinal direction of the support shaft 42. . The reversing member 41 is provided with a select arm 43 extending downward on the opposite side with the support shaft 42 sandwiched between the connecting portion with the joint arm 31. A recess 42a is provided in the support shaft 42 in the longitudinal direction of the shaft. As shown in FIG. 16, the ball 41a is fitted into the recess 42a by the urging force of the compression coil spring 41b so that the support shaft 42 slides smoothly. It has.

The reversing mechanism 40 is a space for arranging the 1-2 speed change synchronizer 19 of the input shaft 3 and is a space above the input shaft 3, that is, the first speed input above the input shaft 3. Annular recess 3a between the gear 8 and the second speed input gear 9
Placed in As a result, the vertical layout of the transmission becomes advantageous, and the vertical length of the transmission can be shortened, for example.

In FIG. 2, both ends of a support shaft 42 which pivotally supports the reversing mechanism 40 are attached near the case dividing surface X of the mission case 2 which is divided into three along the axial direction of the shaft. It is fixed by bolts 45 and the like near the case dividing surface X in the left-right direction. An opening 41 c that engages with the joint arm 31 is formed on the upper surface of the reversing member 41. A compression coil spring 44 is wound around the outer peripheral surface of the support shaft 42 located at both ends of the reversing member 41 in the longitudinal direction so that the compression coil spring 44 returns to the original position when the reversing member 41 moves in the left-right direction along the axis. Press from one side to hold the reversal member in the neutral position.

The reversing mechanism 40 includes a reversing member 41 and a support shaft 4.
2. The compression coil spring 44 and the like are assembled in advance in a sub-assembly state and assembled in the mission case 2. By providing the support shaft 42 near the case dividing surface X in this way, at a position where the operator can reach. It can be easily assembled.

<Reason for providing the reversing mechanism> In the transmission of this embodiment, the gear arrangements of the input shaft 3 and the counter shaft 4 are arranged in order from the input side to the fifth speed input gear 6, the fifth speed counter gear 12, and the reverse input gear. 7 and reverse counter gear 13, first speed input gear 8 and first speed counter gear 14, second speed input gear 9 and second speed counter gear 15, third speed input gear 10 and third speed counter gear 16, fourth speed drive gear 1
The 1st and 4th speed counter gears 17 are used. In this gear arrangement, the reverse gears 7 and 13 are on the rear side (output side) with the 5-R shift synchronizer 18 interposed, and the second speed gears 9 and 15 are on the rear side (output side) with the 1-2 shift synchronizer 19 interposed. ) The 4th speed gear 11 with the 3-4 speed change synchronizer 20 in between,
17 are arranged on the rear side (output side), respectively. on the other hand,
As shown in FIG. 7, looking at the shift pattern of this transmission, the second speed, the fourth speed, and the reverse speed are all shift operations to the rear of the vehicle. However, since the shift rod 34 is supported in the mission case with the spherical portion 33a as the pivot center, the shift rod 34 shifts to the front of the vehicle without the reversing mechanism 40. This is an operation, and the H-shaped shift pattern shown cannot be achieved. For the reason described above, the reversing mechanism 40 is provided.

<Effects of Gear Arrangement> As described above, in the input shaft and the counter shaft, the fifth speed gears 6 and 12 are connected to the front side (input side) and the reverse gears 7 and 13 with the 5-R shift synchronizer 18 interposed therebetween. On the rear side (output side),
The first-speed gears 8 and 14 are arranged on the front side (input side) and the second-speed gears 9 and 15 are arranged on the rear side (output side) with the 1-2 speed change synchronization device 19 interposed therebetween, and in the output shaft and the counter shaft, 3- The third speed gears 10 and 16 are connected to the front side (input side) and the fourth speed gears 11 and 1 with the fourth speed change synchronization device 20 interposed therebetween.
By arranging 7 on the rear side (output side),
By only providing one reversing mechanism 40, three shift rods 63 to 65 described later can be operated, and an H-shaped shift pattern can be realized by one reversing mechanism, which simplifies the structure and reduces the cost, and the transmission case. The degree of freedom in the layout of each part inside can be increased.

In this embodiment, 5-R gears, 1-2
Each combination of the high speed gear and the 3-4 speed gear is arranged in order from the front side of the shaft. For example, the combination of the 1-2 speed gear is the front side of the shaft and the combination of the 5-R gear is the rear side of the shaft. Even if it is arranged on the side, the above effect can be enjoyed.

<Reason for Arranging Gears> One of the reasons for arranging the gears as described above is to arrange the gear with the largest diameter (the fifth speed input gear 6 in FIG. 1) on the input side and compare the diameters. By arranging relatively small gears (reverse, first speed, second speed, third speed input gears 7 to 9 in FIG. 1) in the central portion of the shaft, it is possible to easily install each counter gear and the synchronizing device on the counter shaft. is there.

Another reason is that the fifth-speed counter gear 12, which has a small gear diameter and is a floating gear that is relatively rotatable, has a small shaft diameter, is arranged at the end of the shaft. The shaft can be made thin and has a thick central portion, and bending of the shaft can be suppressed. On the other hand, since the 1st speed and 2nd speed input gears on the input shaft 3 side are directly toothed on the shaft, they are not as thin as the 5th speed counter gear. As shown in FIG. 14, 5 of the counter shaft 4
Assuming that the speed counter gear inner diameter d1, the hub inner diameter d2 of the 5-R shift synchronizer 18 and the reverse counter gear inner diameter d3 are:
When assembled, the inner diameter of each gear of the counter shaft is d1 <
It cannot be assembled unless the relationship of d2 <d3 is satisfied. If the fifth gear input gear 6 is arranged behind the reverse input gear 7, that is, on the output side, and the gear arrangements thereof are interchanged, the relationship of d3 <d2 <d1 is set with the smallest inner diameter of the fifth gear as a reference. Must be met. When the gears are arranged on the counter shaft so as to satisfy this relationship, as shown in FIG. 15, the counter shaft 4 ′ becomes extremely thin and weak in strength, and the flexure of the shaft becomes large, which makes it impossible to realize. Become.

On the other hand, when the reverse counter gear 13 is arranged in the first speed counter gear and the fifth speed counter gear 12 is arranged in the second speed counter gear, the rear side of the fifth speed counter gear becomes narrower and the same cannot be realized as described above. Becomes

Therefore, the transmission according to the present embodiment is provided with 5th speed, reverse, 1st speed, 2nd speed, 3rd speed, 4th speed from the input side.
The gears are arranged like speed.

<Shift Rod> Next, the shift rod will be described. FIG. 3 is a view showing the shift rod arranged in the mission case. FIG. 4 is a cross-sectional view showing the mounting position of the shift rod, as viewed from above inside the mission case. 5 is a sectional view taken along the line AA of FIG.

3 to 5, the select arm 43 of the reversing mechanism 40 has rod arms 60 to 60 extending laterally from three shift rods 63 to 65 provided in parallel.
It is engaged with 62. The shift rods 63 to 65 are used as 3-4 shift shift rods, 5-R shift shift rods, 1-2 shift shift rods for each shift operation in order from the top of FIG. On the side, the input shaft 3 and the counter shaft 4
It is slidably disposed between the upper and lower widths defined by and. 3
-4 The rod arm 60 of the shift rod 63 is 3-
The rod arm 61 of the 5-R gear shift rod 64 extends diagonally upward from the end fixed to the 4-speed gear shift rod 63, and extends diagonally upward from the end fixed to the 5-R gear shift rod 64. Installed, 1-2 shift rod 6
The rod arm 62 of No. 5 is a 1-2 speed shift rod 65.
The shift fork fixed to (since the shift fork and the end portion are integrated) extends obliquely upward. The shift rod 63 is slidably fitted in the boss portion 66. Further, the shift rods 64 and 65 are slidably fitted together by a boss portion 68.

Each shift rod 63-65 has three recesses 70-72, 72-75, 76-7 arranged in the axial longitudinal direction.
8 is provided, and as shown in FIGS. 4 and 5, the balls 81 to 83 provided for each shift rod are provided with three recesses 70 to 72, 7 by the biasing force of the compression coil springs 84 to 86.
2 to 75 and 76 to 78 are fitted so that the shift rods 63 to 65 can be slid. That is, the shift rods 63 to 65 are defined at the positions of the recesses 70, 73, and 76 that are synchronized with the front gear, and the recesses 71,
The neutral position is defined by the positions of 74 and 77, and the position is defined by the recesses 72, 75 and 78 to be synchronized with the rear gear. Balls 81-83 and compression coil springs 84-8
6 is attached to the inner surface of the mission case 2 with a bolt or the like.

<Lock Plate> Next, the lock plate provided on the shift rod will be described. FIG.
It is the figure which looked at the lock plate shown in FIG. 3 from the output side.

As shown in FIGS. 3 and 4, the recesses 70 to 7 are formed.
A lock plate 90 is engaged with one end of each of the shift rods 63 to 65 further to the side of 2, 72 to 75, 76 to 78. The lock plate 90 is supported so as to be sandwiched between the side surfaces inside the mission case 2 and is slidable in the vertical direction. The lock plate 90 is formed with recessed grooves 91 to 93 that engage with the shift rods 63 to 65. Inner surfaces 91a and 91b of the recessed groove 91, inner surfaces 92a and 92b of the recessed groove 92, inner surfaces 93a of the recessed groove 93, 93b is formed in a curved surface. Further, the shift rod 63 has
A concave portion 63a is formed at a position corresponding to the inner surface 91a of the concave groove 91, and the inner surface 91a of the concave groove 91 and the concave portion 63a are fitted to each other according to the operation of the shift rods 63 to 65. Similarly, the shift rods 64 and 65 are provided with recesses 64a and 65a at positions corresponding to the inner surfaces 92b and 93b of the recessed grooves 92 and 93, and the recesses 92a and 65a are formed in accordance with the operation of the shift rods 63 to 65. , Inner surface 9 of 93
2b and 93b are fitted in the recesses 64a and 65a.

(Operation of Lock Plate) The operation of the above lock plate will be described.

The lock plate 90 includes, for example, the select arm 43 of the reversing mechanism 40 having two rod arms 60,
61, and if you operate the shift lever as it is, the two shift forks will be moved at the same time.
It is provided to prevent a so-called double shift operation.

For example, the inner surface 91a of the concave groove 91 shown in FIG.
While the 5-R shift rod 64 and the 1-2 shift rod 65 can be freely operated in the left-right direction when the recessed portion 63a and the recess 63a are fitted together, once the 3-4 shift rod 63 is When the gear is moved to the third speed or the fourth speed, the fitting between the inner surface 91a of the concave groove 91 and the concave portion 63a is released, the lock plate is moved upward, and the inner surface 92 of the concave groove 92 is moved this time.
b and the concave portion 64a, and the inner surface 93b of the concave groove 93 and the concave portion 65a are fitted to each other, and in the state where the gear is shifted to the third speed or the fourth speed, the 5-R shift shift rod 64, the 1-2 shift shift. The movement of the rod 65 is restricted.

As described above, the lock plate is moved upward or downward by the driver's shift change operation, and the double shift operation can be reliably regulated by the lock plate having a simple structure.

<Shifting Operation> Next, shifting operation of the transmission shown in FIG. 1 will be described.

(Shifting Operation to 5th Speed or Reverse Speed) FIG. 7 is a diagram showing a shift pattern of the transmission shown in FIG. FIG. 8 is a diagram for explaining the operation at the time of a speed change operation to the fifth speed or the reverse speed. FIG. 9 is a cross-sectional view of FIG. 8, showing the interior of the mission case in more detail.

In FIGS. 7 to 9, the neutral position N
9 is operated in the direction of arrow S1, the control rod 30 is rotated, and the reversing member 41 resists the urging force of the one compression coil spring 44 along the longitudinal direction of the support shaft 42 to the left in FIG. Slide in the direction. In this state,
The select arm 43 engages with the rod arm 61 of the 5-R transmission shift rod 64.

When the shift lever is further shifted to the fifth speed from this state, the control rod 30 slides in the arrow P1 direction in FIG. 8, and the reversing member 41 rotates with respect to the support shaft 42 in the arrow R1 direction. Therefore, the select arm 43 slides the shift rod 64 through the rod arm 61 in the direction Q1 opposite to the sliding direction P1 of the control rod. Then, a shift fork (not shown) extended from the shift rod 64 and engaged with the 5-R shift synchronizer 18
However, the sleeve is moved to the 5-speed counter gear 12 side, and the sleeve gradually synchronizes the rotation with the 5-speed counter gear 12. Finally, the sleeve is a 5-speed counter gear 12
, The rotation of the input shaft 3 is transmitted to the counter shaft 4 via the fifth speed counter gear,
The rotational force changed to the fifth speed is transmitted to the output shaft 5.

On the other hand, when the shift lever is shifted to the reverse speed, the control rod 30 slides in the direction of arrow P2 in FIG.
Since it rotates in two directions, the select arm 43 slides the shift rod 64 in the direction Q2 opposite to the sliding direction P2 of the control rod via the rod arm 61. Then, a shift fork (not shown) extended from the shift rod 64 and engaged with the 5-R shift synchronizer 18 moves the sleeve to the reverse counter gear 13 side, and the sleeve gradually moves to the reverse counter gear 13. Synchronize the rotation. Finally, the sleeve is reverse counter gear 13
The rotation of the input shaft 3 is inverted via the reverse idle gear and the reverse counter gear and transmitted to the counter shaft 4, and the rotational force shifted to the reverse stage is transmitted to the output shaft 5.

(Shifting operation to 1st gear or 2nd gear) FIG.
[Fig. 6] is a diagram for explaining an operation at the time of a speed change operation to the first speed or the second speed. FIG. 11 is a cross-sectional view of FIG. 10, showing the interior of the mission case in more detail.

In FIGS. 7, 10, and 11, when the shift lever at the neutral position N is operated in the direction of arrow S2, the control rod 30 is rotated and the reversing member 41 is moved along the longitudinal direction of the support shaft 42. It slides to the right in FIG. 9 against the biasing force of one compression coil spring 44. In this state, the select arm 43 engages with the rod arm 62 of the 1-2 speed shift rod 65.

When the shift lever is further shifted to the first speed from this state, the control rod 30 slides in the arrow P3 direction in FIG. 10, and the reversing member 41 rotates with respect to the support shaft 42 in the arrow R3 direction. So select arm 43
Shifts the shift rod 65 through the rod arm 62 in the direction Q3 opposite to the sliding direction P3 of the control rod. Then, it is extended from the shift rod 65, and 1-2.
The shift fork 62a that engages with the speed change synchronization device 19,
The sleeve is moved to the first speed counter gear 14 side, and the sleeve gradually synchronizes the rotation with the first speed counter gear 14. Finally, when the sleeve meshes with the first speed counter gear 14, the rotation of the input shaft 3 is transmitted to the counter shaft 4 via the first speed counter gear, and the rotational force shifted to the first speed is applied to the output shaft 5. Transmitted to.

On the other hand, when the shift lever is shifted to the 2nd speed, the control rod 30 slides in the direction of arrow P4 in FIG.
Since it rotates in the direction, the select arm 43 slides the shift rod 65 via the rod arm 62 in the direction Q4 opposite to the sliding direction P4 of the control rod. Then, the shift fork 62a extending from the shift rod 65 and engaged with the 1-2 shift synchronizer 19 moves the sleeve thereof to the second speed counter gear 15 side, and the sleeve gradually rotates to the second speed counter gear 15. Tune in. Finally, when the sleeve meshes with the second speed counter gear 15, the rotation of the input shaft 3 is transmitted to the counter shaft 4 through the second speed counter gear, and the rotational force shifted to the second speed is applied to the output shaft 5. Transmitted.

(Shifting operation to the third speed or the fourth speed) FIG.
[Fig. 8] is a diagram for explaining an operation at the time of a shift operation to the third speed or the fourth speed. FIG. 13 is a cross-sectional view of FIG. 12, showing the interior of the mission case in more detail.

In FIGS. 7, 12, and 13, the shift lever is a compression coil spring 44 wound around the reversing member 41.
As a result, the neutral position N is maintained in the state where no gear is selected. At this neutral position N, the select arm 43 is engaged with the rod arm 60 of the 3-4 speed shift rod 63.

When the shift lever is further shifted to the third speed from this state, the control rod 30 slides in the direction of arrow P5 in FIG. 12, and the reversing member 41 rotates with respect to the support shaft 42 in the direction of arrow R5. So select arm 43
Slides the shift rod 63 through the rod arm 60 in the direction Q5 opposite to the sliding direction P5 of the control rod. Then, it is extended from the shift rod 63 and 3-4
A shift fork (not shown) engaged with the speed change synchronizer 20
62a moves the sleeve to the third speed input gear 10 side, and the sleeve gradually synchronizes the rotation with the third speed input gear 14. Finally, when the sleeve meshes with the third speed input gear 10, the rotation of the input shaft 3 is transmitted to the counter shaft 4 via the third speed counter gear 16, and the rotational force shifted to the third speed is applied to the output shaft. 5 is transmitted.

On the other hand, when the shift lever is shifted to the fourth speed, the control rod 30 slides in the direction of arrow P6 in FIG.
Since it rotates in the direction, the select arm 43 slides the shift rod 63 through the rod arm 60 in the direction Q6 opposite to the sliding direction P6 of the control rod. Then, a shift fork (not shown) that extends from the shift rod 63 and engages with the 3-4 shift synchronizer 20 moves the sleeve thereof to the 4th speed input gear 11 side, and the sleeve gradually moves to the 4th speed input gear. Tune the rotation to 11. Finally, the sleeve meshes with the fourth speed input gear 11, whereby the rotation of the input shaft 3 is directly shifted to the fourth speed without passing through the counter shaft 4 and transmitted to the output shaft 5.

As described above, in the transmission of this embodiment, the three shift rods 63 to 65 can be operated only by providing one reversing mechanism 40, and the H-type shift pattern can be realized by one reversing mechanism. .

<Arrangement of Shift Rods> Next, the arrangement positions of the above-mentioned three shift rods will be described. FIG.
FIG. 18 is a cross-sectional view of the inside of the mission case showing the positional relationship between the shift rods.

16 to 18, in each shift rod 63 to 65, the reversing mechanism 40 is arranged above the input shaft 3, and the 5-R shift synchronizing device 18 and the 1-2 shift synchronizing device 19 are the counter shaft 4. On the other hand, in view of the layout in the mission case 2 in which the 3-4 gear shift synchronizer 20 is arranged on the input shaft 3 side, it is necessary to provide it on the side of the input shaft 3 and the counter shaft 4. Moreover, the shift rods 63 to 65 are arranged on the sides of the input shaft 3 and the counter shaft 4 and in the range between the shaft center axes D. The reversing mechanism 40 is located above the input shaft 3 (substantially directly above).
It is provided in. The shift rods 63 to 65 are slidably supported in the mission case 2.

With this arrangement, the ring-shaped arm 60a extending from the rod arm 60 and engaged with the sleeve of the synchronizer has a symmetrical shape with respect to the vertical direction, and the rod arm 6 is provided. Since the ring-shaped arms 61a and 62a extending from 62 and engaged with the sleeve of the synchronizer can be approximated to an asymmetrical but symmetrical shape, the rigidity of both arms can be made substantially equal. Improves the driver's feeling of gear shifting operation by eliminating the drawbacks that the arm flexes due to the operation force required for synchronization and the gear shifting operation cannot be performed smoothly, and the driver's gear shifting operation feels uncomfortable. be able to. If the arm rigidity is extremely different, the sleeve is pushed only by the arm with the higher rigidity, the sleeve tilts and twists, which increases the operating force and wears the sliding part of the shift fork with the sleeve. As a result, gear disengagement is likely to occur, and in extreme cases it may be impossible to shift.

<Reverse Idle Gear Mechanism> Next, the structure of the reverse idle gear mechanism mounted on the transmission of this embodiment and the method of assembling it will be described. FIG. 19 is a cross-sectional view showing a part of the reverse idle gear mechanism in which the transmission of FIG. 1 is viewed from above. 20 is a sectional view showing the reverse idle gear mechanism of FIG. 19 as a single unit. FIG. 21 corresponds to FIG.
It is the bottom view which looked at the reverse idle gear mechanism of 0 from the lower part. 22 is a sectional view taken along the line BB of FIG.

As shown in FIGS. 19 to 22, the reverse idle gear mechanism 100 includes the reverse idle gear 1
02 is retrofitted to the side surface portion inside the mission case 2 so that it meshes with both the reverse input gear 7 and the reverse counter gear 12. Reverse idle gear 10
By engaging with the reverse counter gear 13, the reference numeral 2 reverses the rotation of the reverse input shaft 7 of the input shaft 3 and transmits it to the counter shaft 4.

The reverse idle gear mechanism 100 comprises a case member 101, a reverse idle gear 102, a reverse idle shaft 103, and an O-ring 104. The reverse idle gear 102 is meshed with and fixed to the shaft 103 by a spline so as to rotate together with the reverse idle shaft 103. The reverse idle shaft 103 is rotatably supported by the bearing portion 101b of the case member 101. An annular flange portion 101a is formed in the case member 101, and a plurality of bolt holes 101c (six in FIG. 21) are formed in the flange portion 101a at substantially equal intervals. The O-ring 104 is provided on the fitting surface between the flange portion 101 a and the mission case 2. This flange part 10
1a has the effect of improving the oil sealability when assembled to the mission case 2 together with the O-ring 104.

(Assembling Method of Reverse Idle Gear Mechanism) Next, an assembling method of the above reverse idle gear mechanism will be described.

The reverse idle gear mechanism 100 is provided separately from the mission case 2 in a sub-assembled state in which the reverse idle gear 102 and the reverse idle shaft are incorporated in the case member 101 in advance.

This reverse idle gear mechanism 100 is
After the transmission gears of the input shaft 3 and the counter shaft 4 in the mission case 2 are assembled, the flange portion 101a of the case member 101 is positioned in the mounting opening 2a provided on the outer side surface of the mission case 2 and the bolts are positioned. It is assembled with a bolt or the like through the hole 101c. Since the shafts are assembled before the reverse idle gear mechanism 100 is attached to the mission case, the shafts can be assembled without interfering with the reverse idle gear when the shafts are assembled. The fitting portion of the mounting opening 2a and the flange portion 101a are formed to have substantially the same outer dimensions, and the mounting opening 2a and the flange portion 101a are formed in a circular shape to improve the positioning accuracy of both members. . Further, the mounting rigidity is increased by extending the mounting opening 2a laterally of the mission case 2.

The reverse idle gear mechanism 100 is mounted on the input side of the position where the reversing mechanism 40 is arranged in the transmission case 2, and the shift rods 63 to 65 are arranged with the input shaft or the like interposed therebetween. Is a side surface portion of the mission case 2 on the side opposite to the open side, and the case split surface X of the mission case 2 divided into three
It is attached to the input side in the vicinity. As described above, by providing the reverse idle gear mechanism 100 on the input side of the case dividing surface X, the entire length can be shortened as compared with the case of being supported integrally with the conventional case.

[Modification] The present invention can be applied to a modified or modified version of the above embodiment without departing from the spirit thereof.

For example, the reverse idle gear mechanism 100 described with reference to FIGS. 19 to 22 is mounted on an input reduction type transmission 1'as shown in FIG. 23 in addition to the output reduction type transmission shown in FIG. be able to.

In this transmission 1 ', the input shaft 3'and the counter shaft 4'are constantly meshed with the 4-speed input shaft 10' and the 4-speed counter shaft 16 ', and the input shaft 3'to the counter shaft 4'. The rotational force transmitted to the output shaft is transmitted from the counter shaft 4 ′ by being connected at a gear stage having a drive gear of the output shaft.

In this type of transmission 1 ', the reverse idle gear mechanism 100 is retrofitted to the transmission case 2'so as to mesh with the reverse drive gear 7'and the reverse counter shaft 13'.

[0067]

As described above, according to the transmission and the method of manufacturing the same of the present invention, the idle gear that meshes with the reverse gear pair among the plurality of gear pairs is the input shaft, the counter shaft, A support member provided separately from the case member accommodating the output shaft is pivotally supported.

Further, of the plurality of transmission gear pairs, a separate support member in which an idle gear to be meshed with the rear transmission gear pair is incorporated in advance is attached to a case member for accommodating the input shaft, the counter shaft and the output shaft. And then assemble it to the case member.

Therefore, the reverse idle gear can be easily assembled, and the working efficiency can be improved.

[0070]

[Brief description of drawings]

FIG. 1 is a side sectional view showing an overall structure of a transmission according to an embodiment of the present invention.

FIG. 2 is an upper sectional view showing a mounting position of a reversing mechanism in the transmission case.

FIG. 3 is a diagram showing a shift rod arranged in a mission case.

FIG. 4 is a cross-sectional view showing the mounting position of the shift rod, as viewed from above inside the mission case.

FIG. 5 is a sectional view taken along the line AA of FIG. 4;

6 is a view of the lock plate shown in FIG. 3 viewed from the output side.

FIG. 7 is a diagram showing a shift pattern of the transmission shown in FIG.

FIG. 8 is a diagram illustrating an operation at the time of a speed change operation to the fifth speed or the reverse speed.

9 is a cross-sectional view of FIG. 8, showing the interior of the mission case in more detail.

FIG. 10 is a diagram illustrating an operation during a gear shift operation to the first speed or the second speed.

11 is a cross-sectional view of FIG. 10, showing the interior of the mission case in more detail.

FIG. 12 is a diagram for explaining an operation at the time of a shift operation to the third speed or the fourth speed.

FIG. 13 is a sectional view of FIG. 12, showing the interior of the mission case in more detail.

FIG. 14 is a diagram illustrating the reason why the gear arrangement is as shown in FIG. 1.

FIG. 15 is a diagram illustrating the reason why the gear arrangement is as shown in FIG.

16 is a sectional view of the inside of the mission case showing the positional relationship of the shift rods shown in FIG.

17 is a cross-sectional view of the inside of the mission case showing the positional relationship of the shift rods shown in FIG.

18 is a cross-sectional view of the inside of the mission case showing the positional relationship of the shift rods shown in FIG.

FIG. 19 is a top view of the transmission shown in FIG.
It is a sectional view showing a portion where a reverse idle gear mechanism is arranged.

20 is a sectional view showing the reverse idle gear mechanism of FIG. 19 as a single body.

FIG. 21 is a bottom view of the reverse idle gear mechanism of FIG. 20 seen from below.

22 is a sectional view taken along the line BB of FIG.

FIG. 23 is a side sectional view in which a reverse idle gear mechanism is mounted on another type of trunk transmission as a modified example.

[Explanation of symbols]

 1 ... transmission 2 ... mission case 3 ... input shaft 4 ... counter shaft 5 ... output shaft 6 ... 5-speed input gear 7 ... reverse input gear 8 ... first speed input gear 9 ... second speed input gear 10 ... third speed input gear 11 ... Fourth speed drive gear 12 ... Fifth speed counter gear 13 ... Reverse counter gear 14 ... First speed counter gear 15 ... Second speed counter gear 16 ... Third speed counter gear 17 ... Fourth speed counter gear 18 ... 5-R shift synchronizer 19 ... 1 -2 speed change synchronizer 20 ... 3-4 speed change synchronizer 30 ... control rod 31 ... joint arm 32 ... joint 33 ... connection rod 34 ... shift lever 40 ... inversion mechanism 50-55 ... bearing 60-62 ... rod arm 63 ... 3 -4 speed shift rod 64 ... 5-R Shift rod 65 ... 1-2 shift shift rod 90 ... lock plate 100 ... the reverse idle gear mechanism

Claims (6)

[Claims] 1. An input shaft (3), an output shaft (5) concentrically provided with the input shaft (3) and rotatably arranged independently of the input shaft (3), and the input. Each of the shafts (3, 4, 5) has a shaft (3) and a counter shaft (4) arranged in parallel with the output shaft (5) and transmitting the rotational force of the input shaft (3).
A plurality of transmission gear pairs (6,
7,8,9,10,12,13,14,15,16) is operated by the shift lever operation (3
4) by selecting via the synchronizer (18, 19, 20) the rotational force of the input shaft (3) to the counter shaft (4).
A transmission device for transmitting to an output shaft (5) via a plurality of transmission gear pairs (6, 7, 8, 9, 10, 12,
13, 14, 15, 16), the idle gear (102) that meshes with the reverse speed change gear pair (7, 13)
A transmission comprising: a support member (100) provided separately from the case member (2) accommodating the input shaft (3), the counter shaft (4), and the output shaft (5). 2. The support member (100) is fitted to the case member (2), and a fitting portion of the support member (100) and the case member (2) is formed in a circular shape. The transmission according to Item 1. 3. The fitting portion on the case member (2) side is extended to the outside of the case, and the inner surface of the fitting portion on the case member (2) side is fitted to the supporting member (100) side. 3. The transmission according to claim 2, wherein the outer surface of the portion is brought into contact with and an oil seal is provided at the contact portion. 4. The transmission comprises predetermined transmission gears (11, 11) provided on the input shaft (3) and the output shaft (5), respectively.
17) is made to be interlocked with each other by being constantly meshed, and the plurality of transmission gear pairs (6, 7, 8, 9, 10,
12, 13, 14, 15, 16) are output reduction type transmissions provided on the input shaft (3) and the counter shaft (4), and the synchronization device (18, 1)
Transmission according to claim 1, characterized in that 9) is provided on the counter shaft (4). 5. The plurality of transmission gear pairs (6, 7,) by inverting the operation direction of the shift lever (34).
Inversion means (4, 8, 9, 10, 12, 13, 14, 15, 16) that enables selection according to a predetermined shift pattern.
0), the reversing means (40) is supported in the vicinity of the mating surface of the case member (2) divided into a plurality, and the supporting member (100) is the mating surface () of the case member (2). The transmission according to claim 4, wherein the transmission is arranged on the input side of 3a) and on the input side of the arrangement position of the reversing mechanism 40. 6. An input shaft (3), an output shaft (5) concentrically arranged with the input shaft (3) and rotatably arranged independently of the input shaft (3), and the input. Each of the shafts (3, 4, 5) has a shaft (3) and a counter shaft (4) arranged in parallel with the output shaft (5) and transmitting the rotational force of the input shaft (3).
A plurality of transmission gear pairs (6,
7,8,9,10,12,13,14,15,16) is operated by the shift lever operation (3
4) by selecting via the synchronizer (18, 19, 20) the rotational force of the input shaft (3) to the counter shaft (4).
A method for manufacturing a transmission device, which transmits to an output shaft (5) via a plurality of transmission gear pairs (6, 7, 8, 9, 10, 12,
Of the 13, 14, 15, 16), a separate support member (100) in which an idle gear (102) to be meshed with a reverse speed change gear pair (7, 13) is incorporated in advance is used as the input shaft (3). A method for manufacturing a transmission, comprising: assembling the counter shaft (4) and the output shaft (5) to a case member (2) that accommodates them, and then assembling the case member (2).