JP2561390Y2 - Transmission case structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a transmission case.

[0002]

2. Description of the Related Art A transmission changes an output torque of an engine by changing a gear ratio in accordance with changing running conditions, thereby enabling smooth and comfortable running.

[0003] Usually, a transmission is constituted by supporting a plurality of gears meshed with each other on a plurality of shafts arranged in parallel, respectively, and combining the gears meshed between the upper and lower two shafts. By changing the torque, the torque output from the engine is converted.

[0004] The transmission is housed in a transmission case and connected to the vehicle body via the transmission case.

Since the transmission case must support a large number of gears that mesh with each other while rotating, not only does the transmission case need to have sufficient strength, but it also requires a high precision in order to smoothly mesh the gears. Is required.

An output housing of the two-wheel drive vehicle is connected to an output side end of the transmission case, which rotatably supports a propeller shaft and has a mount for connecting the transmission case to a vehicle body.

On the other hand, in the case of a four-wheel drive vehicle, the torque output from the transmission must be distributed to the front wheels and the rear wheels. For this reason, for example,
As disclosed in Japanese Patent No. 14062, a transfer is provided on the output side of the transmission, and a transfer housing for supporting the transfer is connected to an output side end of the transmission case. .

An annular flange portion is integrally formed on the outer periphery of the connection end of the extension housing and the transfer housing, and the flange portion is brought into contact with an annular flange portion provided at an output end of the transmission case. By tightening the bolt, the extension housing or the transfer housing is connected to the transmission case.

[0009]

[Problems to be solved by the invention]
As disclosed in the above publication, a gear mechanism for distributing the torque output from the transmission is provided therein. For this reason, the transfer housing for accommodating them is considerably larger than the extension housing.

Therefore, even when the same transmission is used, the connection of the extension housing or the transfer housing is required.
Transmission cases with different connection flange sizes had to be prepared separately.

For this reason, there are problems that it is difficult to rationalize the manufacturing process and the manufacturing cost increases.

In order to solve the above problem, a method of connecting a transfer housing with a connection housing between the output side end of the transmission case and the transfer housing has been adopted.

However, as described above, the transmission case is required to have high rigidity and high accuracy. Therefore, if the connection housing or the like is interposed, the accuracy and rigidity are reduced by that amount, and vibration characteristics and the like are reduced. Is also reduced. In addition, the steps for assembling the connection housing greatly increase the production cost.

The present invention was conceived in view of the above circumstances, and solves the above-mentioned conventional problems. Thus, an extension housing and a transfer housing can be provided in one transmission case without using a connecting housing or the like. An object of the present invention is to provide a structure of a transmission case to which any of the housings can be directly connected.

[0015]

Means for Solving the Problems To solve the above problems, the present invention takes the following technical means.

That is, the invention of the present application is a structure of a transmission case in which an extension housing for two-wheel drive or a transfer housing for four-wheel drive is connected to the output end. Is characterized in that an annular flange portion for connecting the extension housing and an annular flange portion for connecting the transfer housing are provided on the same plane so that a part thereof is common. And

[0017]

Operation and Effect of the Invention At the output end of the transmission case according to the invention, an annular flange for connecting the extension housing and an annular flange for connecting the transfer housing are partially formed. They are provided on the same plane in common.

That is, although the size of the annular flange for connecting the extension housing is different from the size of the annular flange for connecting the transfer housing, a part of these flanges is made common. Thus, both flange portions are formed.

Each of the flange portions is provided on the same plane, and either the extension housing or the transfer housing can be directly connected to one transmission case with a sealing property.

Therefore, it is not necessary to separately prepare a transmission case corresponding to the extension housing or the transfer housing, so that the number of manufacturing steps can be reduced and the manufacturing cost can be greatly reduced.

Further, by interposing a conventional connecting housing,
The assembly process can be greatly reduced as compared with the case where the extension housing or the transfer housing is connected. Further, there is no problem that the rigidity of the transmission case is reduced.

Therefore, it is possible to provide a transmission case capable of reducing the number of parts, reducing the number of manufacturing steps, and reducing the manufacturing cost.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the present invention will be specifically described below with reference to the drawings.

In the transmission case 1 according to the present invention, as shown in FIGS. 1 and 2, an input shaft 2 extending from the engine is introduced from one end, and torque is controlled by a gear train (not shown) provided inside the transmission case. After the shift is performed, the driving torque is transmitted to the axle via the output shaft 3 extending from the other end.

As shown in FIGS. 1 and 2, a two-wheel drive extension housing 5 or a four-wheel drive transfer housing 6 is connected to the output side end of the transmission case 1 according to this embodiment.

The extension housing 5 includes:
A bearing or the like for rotatably supporting the output shaft 3 is incorporated, and the output side end opening of the transmission case 1 is closed with a sealing property so that the lubricating oil inside does not leak. .

On the other hand, the transfer housing 6 also incorporates a gear mechanism for distributing the torque converted by the transmission to the front and rear wheels.
An output shaft 3a for transmitting torque to the front wheels and an output shaft 3b for transmitting torque to the rear wheels are extended.

A flange 4 shown in FIGS. 1 to 3 is provided at an output end of the transmission case 1 according to the present embodiment, and an annular flange of the extension housing 5 or the transfer housing 6 is provided. The extension housing 5 or the transfer housing 6 is joined to the transmission case 1 by bringing the parts 8 and 9 into contact with each other via a sealing member (not shown) and screwing a plurality of connection bolts 10 together.

The flange 4 is, as shown in FIG.
The upper portion has a double configuration, and is formed so that two closed annular sealing surfaces can be configured on the same plane.

That is, the extension housing flange portion 4a located at the middle portion in FIG. 3 and the common flange portion 4c formed below the extension housing flange portion 4a provide:
An annular flange portion A corresponding to the flange portion 8 provided on the extension housing 5 shown in FIG. 4 can be formed.

On the other hand, an annular flange portion B corresponding to the annular flange portion 9 provided on the transfer housing 6 shown in FIG. 5 is constituted by the transfer housing flange portion 4b located on the upper outside and the common flange portion 4c. Can be.

The portion surrounded by the extension housing flange 4a and the transfer housing flange 4b according to the present embodiment is configured so as not to communicate with the inside of the transmission housing 1. Therefore, both the extension housing 5 and the transfer housing 6 can be joined to the transmission case 1 with sealing properties.

The flange portion 4 according to the present embodiment includes an annular flange portion A corresponding to the annular flange portion 8 of the extension housing 5 and an annular flange portion B corresponding to the annular flange portion of the transfer housing 6. Are provided on the same plane so that a part thereof is common, that is, the lower common flange portion 4c is common.

Therefore, as shown in FIGS. 1 and 2,
Both the extension housing 5 and the transfer housing 6 can be directly connected to one transmission case 1.

Therefore, it is not necessary to prepare a separate transmission case for the extension housing 5 and the transfer housing 6, and the manufacturing cost can be greatly reduced.

The extension housing 5
And the transfer housing 6 can be directly connected to the end of the transmission case 1,
Compared with the case where the transfer housing is connected using the conventional connection housing, the number of parts and the manufacturing process can be reduced, and the manufacturing cost can be significantly reduced.

Further, as shown in FIG. 1, when the extension housing 5 for two-wheel drive is connected to the transmission case 1, the transfer housing flange 4b is exposed. In this embodiment, the transmission case 1 is formed by using the exposed transfer housing flange 4b.
Or an engine mount member 7 for connecting the extension housing 5 to the vehicle body.

Therefore, the extension housing 5 can be configured more easily, and the transmission case 1 can be connected to the vehicle body with high rigidity.

The scope of the present invention is not limited to the above embodiment. In the embodiment, the extension housing flange 4a and the transfer housing flange 4b are provided in the upper part, and the common flange part 4c is provided in the lower part.
The positions where b and 4c are formed are not limited to the embodiment, and for example, the common flange portion 4c can be provided above.

Further, in the embodiment, when the extension housing 5 is connected, the engine mounting member 7 is provided by utilizing the transfer housing flange 4b.
However, an engine mount member may be provided in the extension housing as in the conventional case.

Further, the shapes and the like of the transmission case 1, the extension housing 5, and the transfer housing 6 are not limited to those in the embodiment, but can be various.

[Brief description of the drawings]

FIG. 1 is a side view for explaining an outline of a transmission case according to the invention of the present application, and is a side view to which a two-wheel drive extension housing is connected.

FIG. 2 is a view for explaining an outline of a transmission case according to the present invention, and is a side view showing a state where a four-wheel drive transfer housing is connected.

FIG. 3 is a view showing a shape of a flange portion of the transmission case, and is a cross-sectional view along the line III-III in FIG. 1;

FIG. 4 is a view showing a shape of a flange portion of the extension housing, and is a cross-sectional view taken along a line IV-IV in FIG. 1;

FIG. 5 is a view showing a shape of a flange portion of the transfer housing, and is a cross-sectional view taken along line VV in FIG. 2;

[Explanation of symbols]

 1 Transmission case 4c Part of (flange) A, B Annular flange

Claims (1)

(57) [Scope of request for utility model registration] 1. A transmission case structure in which an extension housing for two-wheel drive or a transfer housing for four-wheel drive is connected to an output side end, wherein the output side end of the transmission case is provided with the extractor. A transmission, wherein an annular flange portion for connecting a tension housing and an annular flange portion for connecting the transfer housing are provided on the same plane so that a part thereof is common. Case structure.