JPH06221409A - Manufacture of continuously variable transmission - Google Patents

Abstract

PURPOSE:To form a casing to be common for continuously variable transmissions of different transmission torque capacities except for a cover. CONSTITUTION:A casing is composed of a housing 76, a casing main body 78, and a cover 72. Axial direction sizes of V-belt type continuously variable transmission mechanisms 29 are set different in accordance with different transmission torque capacities. When the axial direction size of the V-belt type continuously variable transmission mechanism 29 is large, the cover 72 having a large axial direction size is used, while the axial direction size of the V-belt type continuously variable transmission mechanism 29 is small, the cover of a small axial direction size is selected and used. By thus selecting the cover only, casings for plural continuously variable transmissions can be manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a V-belt type continuously variable transmission.

[0002]

2. Description of the Related Art As a conventional continuously variable transmission, for example, there is one disclosed in Japanese Patent Application Laid-Open No. 3-204436. The continuously variable transmission shown therein uses a V-belt type continuously variable transmission mechanism that uses a V-belt having a constant width dimension.
Therefore, the axial dimension of the V-belt type continuously variable transmission mechanism is constant, and accordingly, the axial dimension of the casing that houses the V-belt type continuously variable transmission mechanism and other fluid transmissions, forward / reverse switching mechanisms, etc. Is also constant. The casing includes a housing for accommodating the fluid transmission, a casing main body for accommodating the forward / reverse switching mechanism and the V-belt type continuously variable transmission mechanism.
And a cover for closing the opening of the casing body, which are always given ones having a constant axial dimension.

[0003]

However, in the conventional continuously variable transmission as described above, when a plurality of transmission torque capacities of the V-belt type continuously variable transmission mechanism are to be set according to the width dimension of the V belt, The following problems occur. That is, when the transmission torque capacity may be small, a V-belt having a small width is used, and accordingly, the axial dimension of the entire V-belt type continuously variable transmission mechanism is reduced. On the other hand, in order to obtain a large transmission torque capacity, basically, the same V-belt type continuously variable transmission mechanism having a large V-belt width dimension is used. Therefore, for example, when manufacturing a continuously variable transmission having two types of transmission torque capacities, two types of casings for accommodating two types of V-belt type continuously variable transmission mechanisms are required. In such a case, in the conventional manufacturing method, since it is necessary to manufacture a casing corresponding to each V-belt type continuously variable transmission mechanism, the number of parts that need to be managed is increased and the manufacturing price is increased. . The present invention aims to solve such problems.

[0004]

The present invention solves the above problems by making it possible to form a plurality of casings by changing only the cover constituting the casing. That is, in the method for manufacturing a continuously variable transmission according to the present invention, the casing includes a housing for housing the fluid transmission, a casing main body for housing the forward / reverse switching mechanism and a part of the V-belt type continuously variable transmission, and a V-belt. And a cover that closes the opening of the casing body on the side remote from the engine while accommodating the remaining part of the continuously variable transmission.
A plurality of covers having different axial dimensions are prepared according to the axial dimension of the V-belt type continuously variable transmission mechanism according to the width dimension of the V-belt, and the cover is adapted according to the width dimension of the assembled V-belt Select and assemble the cover that has the axial dimension.

[0005]

In the case of a continuously variable transmission that needs to transmit a large torque, a V-belt having a large width dimension is assembled. Accordingly, the cover having a large axial dimension is assembled. On the other hand, in the case of a continuously variable transmission that requires a relatively small transmission torque, a V-belt having a small width dimension is assembled. In this case, a cover having a small axial dimension may be assembled. As for the housing and the casing body, the same thing can be used in any case.

[0006]

EXAMPLE FIG. 2 shows the overall structure of a continuously variable transmission (this is similar to that shown in FIG. 3). The continuously variable transmission includes a fluid coupling 12 (which may be a torque converter), a forward / reverse switching mechanism 15, and a V.
It has a belt type continuously variable transmission mechanism 29, a differential device 56, and the like, and can transmit the rotation of the output shaft 10a of the engine 10 to the drive shafts 66 and 68 at a predetermined gear ratio and rotation direction. This continuously variable transmission includes a fluid coupling 12 (lockup oil chamber 12a, pump impeller 12
b, turbine runner 12c, lockup clutch 12
d), rotating shaft 13, forward-reverse switching mechanism 1
5 (comprising planetary gear device 19, forward clutch 40, reverse brake 50, etc.), drive shaft 14, drive pulley 1
6 (fixed cone member 18, drive pulley cylinder chamber 20,
(Movable cone member 22, groove 22a, etc.), V belt 24, driven pulley 26 (composed of fixed cone member 30, driven pulley cylinder chamber 32, movable cone member 34, etc.), driven shaft 28, drive gear 46, idler gear 48. ,
Idler shaft 52, pinion gear 54, final gear 4
4, pinion gear 58, pinion gear 60, side gear 62, side gear 64, drive shaft 66, drive shaft 6
8 and so on.

FIG. 1 shows a continuously variable transmission in which the width of the V belt is large. The V belt 24 is wound around the drive pulley 16 and the driven pulley 26. The movable cone member of the drive pulley 16 is provided with two hydraulic working chambers 20a and 20b. The drive shaft 14 is supported by a cover 72 by a bearing 70. Similarly, the driven shaft 28 is also supported by the cover 72 by the bearing 74. The casing includes a housing 76 that houses the fluid coupling 12, a casing main body 78 that houses part of the forward / reverse switching mechanism 15 and the V-belt type continuously variable transmission mechanism 29, and a V
The cover 72 accommodates a part of the belt type continuously variable transmission mechanism 29 and closes the opening of the casing body 78. The V-belt 24 has a large width in order to transmit a relatively large torque. Therefore, the axial dimension of the V-belt type continuously variable transmission mechanism 29 is L1, and accordingly, the axial dimension of the cover is L2. The cover 72 has an oil passage 9 for supplying hydraulic pressure to the driven pulley cylinder chamber 32.
9 is provided.

FIG. 3 shows a continuously variable transmission having a relatively small transmission torque capacity. In this case, V shown in FIG.
The width dimensions of the belt 24 'are different. That is, the V-belt 24 'has a widthwise dimension B smaller than that of the V-belt 24 shown in FIG. The hydraulic action chamber 20 of the drive pulley is constituted by one chamber, but the axial dimension thereof is the same as that shown in FIG. Therefore, the axial dimension S1 of the V-belt type continuously variable transmission mechanism 29 'is S1 = L1-B. The casing has a housing 76 and a casing body 78 similar to those shown in FIG. 1, with a cover 72 ′ different from that of FIG.
Is assembled. The axial dimension S2 of the cover 72 'is
It is L2-B. The cover 72 'is also provided with the oil passage 99 similar to that described above.

When manufacturing two types of continuously variable transmissions as described above, only two types (29, 29 'and 72, 72') of the V-belt type continuously variable transmission mechanism and the cover may be prepared. The housing 76 and the casing body 78 are exactly the same. At the time of manufacture, a V-belt type continuously variable transmission having an axial dimension of L1 (29)
When assembled, the cover (7
2) is selected and assembled, and when the V-belt type continuously variable transmission of S1 (29 ') is assembled, the cover (72') having the axial dimension S2 may be selected and assembled. As for the casing, if only two types of covers are prepared, two types of casings for continuously variable transmissions having different torque capacities can be manufactured.
In particular, in this embodiment, the width dimension of the V-belt can be changed by simply extending or shortening the cylindrical portion of the cover on the drive pulley side. Is not formed on the cover side, and an oil passage 99 is provided on the driven pulley side that does not change. Therefore, it is possible to deal with the difference in the width dimension of the V-belt by changing the cover as described above without changing the oil passage. Further, since the cover is changed only in the cylindrical portion on the drive pulley side, and the outer shape of the cover does not significantly change, the vehicle mountability is hardly affected.

[0010]

As described above, according to the present invention, the casing is constructed by using the cover selected according to the axial dimension of the V-belt type continuously variable transmission mechanism. By using a common casing body and selectively using only the cover, it is possible to manufacture a plurality of continuously variable transmissions having different transmission torque capacities.

[Brief description of drawings]

FIG. 1 is a diagram showing a continuously variable transmission according to the present invention.

FIG. 2 is a diagram showing a configuration of an entire continuously variable transmission.

FIG. 3 is a diagram showing another continuously variable transmission according to the present invention.

[Explanation of symbols]

 12 Fluid coupling (fluid transmission) 15 Forward / reverse switching mechanism 29, 29 'V-belt type continuously variable transmission mechanism 72, 72' Cover 76 Housing 78 Casing body

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hirofumi Okahara 2nd Takara-cho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd.

Claims (1)

[Claims] 1. A fluid transmission device, a forward / reverse switching mechanism, and a V-belt type continuously variable transmission mechanism are arranged in order from the side closer to the engine, and the V-belt type continuously variable transmission mechanism has an axial dimension according to a plurality of models. In a method of manufacturing a continuously variable transmission, in which different ones are assembled, the casing includes a housing that houses the fluid transmission,
A casing main body that accommodates a part of the forward / reverse switching mechanism and the V-belt type continuously variable transmission mechanism, and a remaining part of the V-belt type continuously variable transmission mechanism, and closes the opening of the casing body on the side far from the engine. The cover is made up of a plurality of covers having different axial dimensions according to the axial dimension of the V-belt type continuously variable transmission mechanism according to the width dimension of the V-belt. A method for manufacturing a continuously variable transmission, characterized in that a cover having an axial dimension corresponding to a width dimension is selected and assembled.