JPH05280612A - Automatic transmission for vehicle - Google Patents

Abstract

PURPOSE:To improve assembling performance of a mission case, secure satisfactory and accurate assembling operability, secure stable bearing support of a sub-shaft, and further satisfactorily provide a forward/back switching mechanism. CONSTITUTION:A forward/back switching mechanism 14 is arranged between a main shaft 16 and a torque converter 12, installed and held onto a torque converter casing 42. One end 16a of the main shaft 16 being connected to the side of the torque converter 12 is rotatably supported by a bearing 54 arranged in a through-hole 48. The other end 16b is supported by a bearing 56 arranged in an opening 50. One end 20a of a sub-shaft 20 is rotatably supported by a bearing 64 arranged in a recession 58. The other end 20b is supported by a bearing 66 arranged in an opening 60.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic transmission for a vehicle equipped with a continuously variable automatic transmission, and in particular, it can improve the assemblability of a mission case and has a good and highly accurate sub-shaft. The present invention relates to an automatic transmission for a vehicle, which can ensure workability in assembling, can secure stable bearing support for a sub-shaft, and can also preferably install a forward / reverse switching mechanism.

[0002]

2. Description of the Related Art There is a continuously variable automatic transmission as a transmission mounted on a vehicle. This continuously variable automatic transmission has an endless belt that is wound around a pair of pulleys having variable groove widths. The engine rotation input to one pulley is continuously changed and output to the other pulley.

By the way, these pulleys are carried by a main shaft and a sub-shaft, which are arranged in parallel at a distance from each other, and these shafts are rotatably supported by bearings on a fixed member such as a casing. . As a specific example of this support structure, the one disclosed in Japanese Patent Publication No. 3-72858 is known. In this support structure, of the pair of shafts, the main shaft connected to the torque converter side has one end supported by the torque converter casing that houses the torque converter,
The other end is supported by a mission casing that houses the continuously variable automatic transmission. On the other hand, the sub shaft connected to the output shaft side has one end supported by the mission casing and the other end supported by a partition wall member provided separately from the mission casing and the torque converter casing. There is. The partition wall member is arranged in the torque converter casing so as to partition the continuously variable automatic transmission side and the output shaft side reduction gear train. The partition wall member includes the reduction gear train side and the pulley side. A through hole for penetrating the other end of the sub-shaft extended so as to connect to and is formed. The other end of the sub shaft is supported by a bearing arranged in the through hole at a position where it is sandwiched between the pulley and the reduction gear train.

On the other hand, in the automatic transmission equipped with the continuously variable automatic transmission, a forward / reverse switching mechanism for changing the direction of the transmission rotation to switch between forward and backward movement is provided. The one disclosed in JP-A-57-173652 is known. In this structure, the forward / reverse switching mechanism is carried on the sub shaft.

[0005]

By the way, in the above-mentioned conventional structure, when assembling the mission case with high rigidity, it is necessary to similarly assemble the partition wall member with high rigidity in addition to the mission casing and the torque converter casing. was there. That is, since this partition wall member not only partitions the space but also functions as a fixing member for positioning and supporting the sub-shaft at a fixed position, it has to be assembled with a high degree of rigidity and high rigidity. .. Therefore, there is a problem that the assembly of the mission case is not good.

Further, regarding the support of the other end of the sub-shaft, the sub-shaft is supported by utilizing a partition wall member which is separately arranged at an intermediate position between the mounting position of the pulley and the mounting position of the reduction gear train. Therefore, it is difficult to assemble with the reduction gear train that exists in the back of the mission casing from the side where the assembly is performed, and it is not possible to secure a good assemble workability.

Further, when positioning the shafts in parallel with each other, the mounting position accuracy of the other end of the sub-shaft is affected by the accumulation of the dimensional error of the torque converter casing and the partition wall member and the mounting error. Accumulation of such errors makes it difficult to set the position of the sub shaft with respect to the main shaft, so that it is impossible to secure high assembly accuracy.

Further, with respect to the bearing support position at the other end of the sub-shaft, since a reduction gear train is further provided outside the bearing position, a support state like a cantilever is provided at this other end, and the reduction gear train is stabilized. It was difficult to secure the support they had.

On the other hand, regarding the arrangement structure of the forward / reverse switching mechanism, the sub-shaft has the above-mentioned problems of assembling workability and mounting accuracy, and the sub-shaft having such various problems has a forward-reverse switching mechanism. It has been difficult to secure high assembly accuracy in the mounting position relationship with peripheral parts.

The present invention was devised in view of the above-mentioned conventional problems, and an object thereof is to improve the assembling property of the mission case and to assemble the sub shaft in a good and highly accurate manner. An object of the present invention is to provide an automatic transmission for a vehicle, which can ensure workability, can also ensure stable bearing support of a sub-shaft, and can also preferably install a forward / reverse switching mechanism.

[0011]

SUMMARY OF THE INVENTION The present invention is directed to an automatic transmission equipped with a continuously variable automatic transmission for controlling a transmission between a pair of pulleys carried on a main shaft and a sub-shaft, respectively, via a belt wound around the pulleys. The transmission case of the device is configured to be separable into two parts, a torque converter casing for housing a torque converter and a mission casing for housing the continuously variable automatic transmission. A support portion for supporting the end portion of the shaft as a bearing is formed, and a forward / reverse switching mechanism is provided between the main shaft and the torque converter, and the forward / backward switching mechanism is supported by the torque converter casing. Is characterized by.

[0012]

The operation of the present invention will be described. Since the transmission case is divided into two parts, that is, the torque converter casing and the transmission casing, and the main shaft and the sub shaft are supported only by these casings. It is possible to eliminate the need for the partition wall member to have a sub-shaft supporting function, and therefore the only members that should be assembled with high precision and rigidity to support the shaft are the torque converter casing and the mission casing. The assembling property can be improved.

With respect to the support of the other end of the sub-shaft, the support position is set to the torque converter casing in which the mounting position of the pulley and the mounting position of the reduction gear train are located on the same side. When viewed from the casing side, the sub-shaft can be attached to the innermost torque converter casing in a state where the pulley and the reduction gear train are attached to the sub-shaft in advance, and good assembling workability can be secured.

Further, since the sub-shaft is directly supported by the torque converter casing instead of being supported by the torque converter casing through the partition wall member as in the conventional case, the shafts are positioned parallel to each other. At the time of installation, it is possible to easily secure the mounting position accuracy of the sub shaft with respect to the main shaft, and thus to secure high assembly accuracy.

Further, since the bearing supporting position at the other end of the sub-shaft is set to the innermost torque converter casing, the mounting position of the pulley and the reduction gear train can be set to the intermediate position of the sub-shaft. The support of the sub shaft does not have a cantilever shape, and thus the bearing support of the sub shaft can be stably ensured.

Further, since the forward / reverse switching mechanism is arranged between the main shaft and the torque converter and the forward / reverse switching mechanism is supported by the torque converter casing, the mounting accuracy and the like are relatively secured as in the conventional case. It is no longer necessary to equip the sub-shaft with a forward / reverse switching mechanism, and the torque converter casing has higher rigidity than the sub-shaft, ensuring high assembly accuracy in the mounting position relationship with the surrounding parts. can do.

[0017]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 shows an embodiment of an automatic transmission for a vehicle according to the present invention, and more specifically, is a sectional front view showing the automatic transmission in a developed state.

That is, in the automatic transmission 10 according to the present embodiment, the engine rotation (not shown) as a power source arranged on the right side in the figure as shown in FIG. 1 causes the planetary gear mechanism to operate via the torque converter 12. Input to the forward / reverse switching mechanism 14 used,
Input from the forward / reverse switching mechanism 14 to the main shaft 16 that constitutes the continuously variable automatic transmission 40. That is, in this embodiment, the forward / reverse switching mechanism 14 is arranged between the main shaft 16 and the torque converter 12. The main shaft 16 connected to the forward / reverse switching mechanism 14 has a primary pulley 1 whose groove width is variable via hydraulic pressure.
8 is carried.

On the other hand, a sub shaft 20 is arranged in parallel with the main shaft 16, and a secondary pulley 22 is carried on the sub shaft 20 at a position corresponding to the primary pulley 18. Like the primary pulley 18, the secondary pulley 22 has a variable groove width via hydraulic pressure, but the secondary pulley 22 is driven by a change in the groove width of the primary pulley 18, and both the pulleys 18,
The groove width 22 is changed in an inversely proportional relationship.

An endless V belt 2 is formed between the primary pulley 18 and the secondary pulley 22.
4 is wound around and circulated, the rotation is transmitted between the main shaft 16 and the sub shaft 20 via the V belt 24, and the groove width change between the primary pulley 18 and the secondary pulley 22 causes stepless speed change. To be done.

Below the right end of the sub-shaft 20 from the secondary pulley 22 in the drawing, an output shaft 26 is arranged in parallel with the sub-shaft 20, and between the sub-shaft 20 and the output shaft 26. Is provided with a first gear 28 and a second gear 30 as reduction gear trains meshed with each other, and the rotation of the sub shaft 20 is transmitted to the output shaft 26 via the first and second gears 28, 30. .. Further, the output shaft 26 has a small-diameter gear 32 constituting a final gear.
The small diameter gear 32 is meshed with the ring gear 36 of the differential gear 34. The rotational force distributed to the left and right by the differential gear 34 is transmitted to the left and right drive wheels (not shown).

By the way, as shown in the drawing, the torque converter 12 side including the forward / reverse switching mechanism 14 is housed in a torque converter casing 42 which entirely covers these components. In particular, the forward / reverse switching mechanism 14 is housed and fixed in a recess 70 formed in the torque converter casing 42 having high rigidity. A transmission casing 44, which defines a space for housing the continuously variable automatic transmission 40 and the like, is detachably attached to the outside of one side of the torque converter casing 42. The continuously variable automatic transmission 40 and the reduction gear trains 28 and 30 are built in the transmission casing 44 between the transmission casing 44 and the torque converter casing 42. That is, the torque converter 12 and the continuously variable automatic transmission 40
The mission case 46 including a torque converter casing 42 and a mission casing 44 is divided into two parts.

On the other hand, the main shaft 16 and the sub-shaft 20 carrying the pair of pulleys 18, 22 of the continuously variable automatic transmission 40 have a torque converter casing 42 and a transmission casing 44 at both ends thereof, respectively.
Is configured to be supported by a bearing.

More specifically, the torque converter casing 42 is formed with a through hole 48 for allowing the main shaft 16 connected to the forward / reverse switching mechanism 14 to penetrate from the mission casing 44 side. An opening 50 is formed to surround the main shaft 16 at a distance from the outside in the radial direction, and a cover 52 is attached to the outside of the opening 50 to close the outside from the opening 50. The main shaft 16 is connected to the opening 5 of the mission casing 44.
From 0 to the torque converter 12 side through the through hole 48 of the torque converter casing 42,
One end 16a connected to the forward / reverse switching mechanism 14 on the torque converter 12 side is rotatably supported by a ring-shaped bearing 54 disposed on the inner peripheral portion of the through hole 48, and the other end 16b is connected. Bearings are supported by a ring-shaped bearing 56 provided on the inner peripheral portion of the opening 50, and both ends thereof are supported. The openings 50 and the through holes 48 function as a support portion that supports the ends 16a and 16b of the main shaft 16 by bearings.

Further, the torque converter casing 42 is formed with a recess 58 corresponding to the position of the one end 20a of the sub-shaft 20, into which the one end 20a is inserted with a margin, and the transmission casing 44 is provided with the sub-shaft 20. An opening 60 is formed surrounding the outside in the radial direction with a space therebetween, and a cover 62 is attached to the outside of the opening 60 in the same manner as described above. The sub-shaft 20 is provided with the opening 60 of the mission casing 44.
To the recessed portion 58 of the torque converter casing 42, the one end 20a thereof is provided with the recessed portion 58.
The bearing 64 is rotatably supported by a ring-shaped bearing 64 disposed on the inner peripheral portion of the inner end of the opening, and the other end 20b is supported by a ring-shaped bearing 66 disposed on the inner peripheral portion of the opening 60. Both ends are supported. Then, the opening 60 and the recess 58 function as a support portion for bearing-supporting the ends 20a and 20b of the sub-shaft 20. Particularly, in the sub-shaft 20, when viewed from the side of the transmission casing 44 where the assembly is performed, not only the secondary pulley 22 but also the reduction gear train is formed on the same side before the recess 58 of the torque converter casing 42. 1 gear 28
Are placed. Reference numeral 68 is a partition wall member that divides the space on the reduction gear train 28, 30 side and the space on the continuously variable automatic transmission 40 side. The partition wall member 68 is attached to the outermost peripheral edge of the secondary pulley 22 and is configured to simply partition these spaces.

By the way, as is apparent from the above structure, in the present embodiment, the transmission case 46 includes the torque converter casing 42 and the transmission casing 44.
Since the main shaft 16 and the sub shaft 20 are supported only by the casings 42 and 44, it is necessary to provide the partition wall member with the function of supporting the sub shaft 20 as in the conventional case. Therefore, the torque converter casing 4 is a member which can be eliminated, and which is to be assembled with high precision and rigidity to support the shaft.
2 and the mission casing 44 alone, the assemblability of the mission case 46 can be improved.

With respect to the support of the one end 20a of the sub-shaft 20, the support position is set to the torque converter casing 42 where the mounting position of the secondary pulley 22 and the mounting position of the first gear 28 are located on the same side. When viewed from the side of the mission casing 44 to be assembled, the subshaft 20 can be attached to the innermost torque converter casing 42 with the secondary pulley 22 and the first gear 28 attached to the subshaft 20 in advance, which is excellent. Assembly workability can be secured.

Further, the torque converter casing 42 is not supported by the torque converter casing 42 through the partition wall member as in the conventional case, but is arranged in the torque converter casing 4 instead.
Since the sub-shaft 20 is directly supported by 2, the positioning accuracy of the sub-shaft 20 with respect to the main shaft 16 can be easily ensured when positioning and installing the shafts 16 and 20 in parallel with each other. Accuracy can be secured.

Further, the bearing support position of the one end 20a of the sub-shaft 20 is set to the innermost torque converter casing 4
Since it is set to 2, the mounting position of the secondary pulley 22 and the first gear 28 can be set to an intermediate position of the sub-shaft 20, and the support of the sub-shaft 20 does not become a cantilever, so that the sub-shaft is not supported. The bearing support of 20 can be stably ensured.

Further, a forward / reverse switching mechanism 14 is provided between the main shaft 16 and the torque converter 12,
Since the forward / reverse switching mechanism 14 is directly supported by the torque converter casing 42, the forward / reverse switching mechanism 1 is attached to the sub-shaft where it is relatively difficult to secure mounting accuracy as in the conventional case.
4 is not necessary, and the torque converter casing 42 has higher rigidity than the sub-shaft 20. Therefore, high mounting accuracy can be secured in the mounting positional relationship with the peripheral parts.

[0031]

In summary, according to the present invention, the automatic transmission provided with the continuously variable automatic transmission for controlling the gear shift between the pair of pulleys carried on the main shaft and the sub-shaft through the belt wound around them The transmission transmission transmission case is configured so that it can be divided into two parts, a torque converter casing that houses the torque converter and a mission casing that houses the continuously variable automatic transmission.
Since a support portion for bearing-supporting the ends of the main shaft and the sub shaft is formed, a forward / reverse switching mechanism is provided between the main shaft and the torque converter, and the forward / reverse switching mechanism is supported by the torque converter casing. , The mission case has a two-part configuration of a torque converter casing and a mission casing,
By supporting the main shaft and sub-shaft only with these casings, the only components that need to be assembled with high precision and rigidity to support the shaft are the torque converter casing and the mission casing, and the mission case can be easily assembled. It can be improved and the support position of the other end of the sub-shaft can be set to the torque converter casing where the pulley mounting position and the reduction gear train mounting position are located on the same side. With the pulley and reduction gear train already attached to the sub-shaft, the sub-shaft can be attached to the innermost torque converter casing to ensure good assembly workability, and the torque converter casing directly Can support the shafts and When positioning and installing in a row, it is possible to easily secure the mounting position accuracy of the sub shaft with respect to the main shaft, to ensure high assembly accuracy, and the bearing support position at the other end of the sub shaft to the deepest position. Can be set in the torque converter casing to secure stable bearing support for the sub-shaft.Furthermore, a forward / reverse switching mechanism is installed between the main shaft and the torque converter, and this forward / reverse switching mechanism can be used for torque conversion. By directly supporting the converter casing, it is possible to secure high assembly accuracy in the mounting positional relationship with the peripheral components.

[Brief description of drawings]

FIG. 1 is a sectional front view showing an embodiment of an automatic transmission for a vehicle according to the present invention in a developed state.

[Explanation of symbols]

 10 Automatic Transmission 12 Torque Converter 14 Forward / Reverse Switching Mechanism 16 Main Shaft 18 Primary Pulley 20 Sub Shaft 22 Secondary Pulley 24 V Belt 40 Continuously Variable Transmission 42 Torque Converter Casing 44 Mission Casing 46 Mission Case 48 Through Hole 50 Opening 58 Recess 60 Opening

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masako Kagawa 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Motor Corporation

Claims (1)

[Claims] 1. A transmission case of an automatic transmission equipped with a continuously variable automatic transmission, wherein a transmission is controlled between a pair of pulleys carried on a main shaft and a sub shaft via a belt wound around the pulleys. Of the main shaft and the sub shaft are bearing-supported by the torque converter casing and the transmission casing, respectively. An automatic transmission for a vehicle, characterized by forming a support portion, disposing a forward / reverse switching mechanism between the main shaft and the torque converter, and supporting the forward / backward switching mechanism on the torque converter casing. apparatus.