JPH04201624A - Installation structure for power train - Google Patents

Abstract

PURPOSE:To prevent the projection of a propeller shaft at collision by supporting one edge of a member which interferes with an extension housing shaft supporting part at collision onto a car body, in a vehicle equipped with the universal joint of the propeller shaft directly behind a transmission. CONSTITUTION:When a vehicle collides with an obstacle, a force in the rearward direction acts on a power train PT, and a transmission 1 is shifted rearward. Then, the A1 part and A2 part of the transmission 1 apply a rearward pushing force for a transmission member 21. Since a car body 19 does not shift, the transmission member 21 shifts in lever form, having the B1 and B2 part as fulcrum, and the C part shifts rearward, and collides with the first dynamic damper 14. Accordingly, the damper D of an extension housing 5 is broken, and the support for an output shaft 2 is eliminated, and a propeller shaft 4 is bent, and projection is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power train mounting structure.

[Conventional technology] Generally, FR cars (front engine/rear drive cars)
In a vehicle, a power train in which an engine and a transmission are arranged in series is arranged vertically with the transmission located at the rear side of the vehicle. The transmission is usually mounted on the vehicle body using a transmission mount member (see, for example, Japanese Utility Model Application No. 62-27825). Here, the output shaft of the transmission (arranged so as to protrude from the rear end of the transmission toward the rear side, this output shaft is supported by a shaft support part of an extension housing attached to the transmission) The output shaft is connected to the propeller shaft near the rear end of the extension housing.

[Problem to be Solved by the Invention] By the way, when such a PR vehicle collides with an obstacle in front of it, a strong force toward the rear acts on the power train, and the power train (transmission) tries to displace toward the rear. do. This causes a problem in that the propeller shaft connected to the output shaft of the transmission is stretched in the longitudinal direction.

Therefore, focusing on the fact that universal joints generally have relatively low rigidity or strength, one possible solution is to bend the universal joint in the event of a vehicle collision to prevent the propeller shaft from being stretched.

However, when the universal joint is placed directly behind the transmission or extension housing, the output shaft immediately in front of the universal joint is firmly supported by the shaft support part of the extension housing, so the universal joint It is difficult to cause the propeller shaft to bend, and there is a problem in that it is not possible to effectively prevent the propeller shaft from being stretched during a vehicle collision.

The present invention has been made in order to solve the above-mentioned conventional problems, and an object of the present invention is to provide a power train mounting structure that can effectively prevent the propeller shaft from being stretched during a vehicle collision. shall be.

[Means for Solving the Problems] In order to achieve the above object, a first invention provides a vehicle in which a universal joint of a propeller shaft is provided immediately behind a transmission, at least one end of which is fixed to the vehicle body side, and Provided is a power train mounting structure characterized in that a collision interference means is provided in which a portion not fixed to the vehicle body interferes with a shaft support portion of an extension housing by interfering with a part of the power train when a vehicle collides. do.

A second invention is the power train mounting structure according to the first invention, in which the collision interference means includes a mission mount member having at least one end fixed to the vehicle body, and an extension by interference with the mission mount member when the vehicle collides with the transmission mount member. Provided is a power train mounting structure characterized by comprising an interference member that destroys a shaft support portion of a housing in the event of a collision.

A third invention is the power train mounting structure according to the second invention, in which the collision interference member is fixed to the shaft support portion of the extension housing, while a portion thereof is disposed close to the mission mount member. The present invention provides a power train mounting structure characterized by a dynamic damper.

[Operations and Effects of the Invention] According to the first invention, for example, when the vehicle collides with an obstacle in front of the vehicle, the power train is displaced toward the rear, and the collision interference means is displaced toward the rear with a strong force. . Here, one end of the collision interference means is fixed to the vehicle body, and this fixed portion hardly moves during a collision. For this reason, the collision interference means uses the above-mentioned fixed part to the vehicle body as a fulcrum,
A lever-like displacement occurs with the point of force interfering with the power train, and the part that is displaced most rearward interferes with the shaft support part of the extension housing. here,
If the collision is severe, the shaft support part will be destroyed by the interference means at the time of collision, and the shaft in front of the universal joint will no longer be supported, so the rigidity of the shaft around the universal joint will decrease, and the universal joint will bend. Propeller shaft tension is prevented.

According to the second invention, basically the same functions and effects as the first invention can be obtained. Since the collision interference means is configured using the originally provided mission mount member, the collision interference means can be easily formed.

According to the third invention, basically the same operation and effect as the first invention can be obtained. Furthermore, since the collision interference means can be formed simply by arranging the originally provided dynamic damper in close proximity to the originally provided mission mount member, an increase in cost is hardly caused.

(Example] Examples of the present invention will be specifically described below.

As shown in Fig. 1, the output torque of the transmission l of the vertically mounted series powertrain PT of an FR vehicle is determined by
It is designed to be transmitted to the rear wheels via. Here, the output shaft 2 is arranged so as to protrude rearward from the rear end of the transmission l. An extension housing 5 is attached to the rear end of the transmission l, and the output shaft 2 is supported by a shaft support IJIK 6 formed at the rear of the extension housing 5.

Further, the universal joint 3 is connected to the output shaft 2 by spline-fitting its hollow portion 7 to the output shaft 2.

The transmission l is mounted on the vehicle body 19 (see Fig. 4) by a transmission mount member 8, which will be explained later.
is mounted on. Further, an oil pan 9 is attached to the lower end of the transmission l.

In addition, the damper mounting portion 1 of the extension housing 5
1, use the fastening bolt 12 to connect the transmission! A dynamic damper assembly is installed to dampen vibrations. For dynamic damper assembly,
A first dynamic damper 14 and a second dynamic damper I5 fixed to the mounting plate 13 are provided. Here, the first dynamic damper 14 is arranged so that its front end face is close to the mission mount member 8, and the second dynamic damper 15 is arranged slightly to the rear side of the first dynamic damper 14. 1st
The dynamic damper 14 includes a weight portion 14a and a rubber portion 14b, and the second dynamic damper 15 similarly includes a weight portion 15a and a rubber portion 15b.

As shown in FIGS. 2 to 4, the mission mount member 8 is provided with a mission member 21 that is bolted to the vehicle body 19 (side frame) using mounting bolts 18. Then, attach this mission member 21 to the extension housing 5 (transmission l).
A mount member M is provided for mounting on. This mount member M includes a first mounting member 23 that is fastened to the mission member 21 using a fixing bolt 22, and an intermediate member 25 that is connected to the first mounting member 23 via a rubber 24 for absorbing vibrations. , and a second mounting member 26 welded to this intermediate member 25, and the second mounting member 26 is bolted to the extension housing 5 (transmission l) using a mount bolt 27.

In this way, the transmission mount member 8 mounts the transmission 7 1 on the vehicle body 19 (site frame) and prevents transmission of vibrations of the transmission i/1 to the vehicle body 19.

Below, the above power train PT and its mounting structure,
The behavior at the time of a vehicle collision will be explained.

The arrangement of each member under normal conditions is shown in FIGS. 5 and 6.

Here, when the vehicle collides with an obstacle in front, for example, as shown in FIGS. 7 and 8, the power train PT
A strong force acts in the rear direction, causing the transmission
is displaced in the rear direction. Therefore, in the A3 section and the A2 section, the transmission 1 and the mission member 21
and interfere with each other, A1. A strong force in the rear direction acts on the mission member 21 at the point A. However, since the vehicle body 19 (side frame) hardly displaces during a collision, the mission member 21 uses the B2 portion and the B2 portion fixed to the vehicle body 19 (side frame) as fulcrums, respectively, and the A1 portion and the A, portion. A lever-like displacement occurs, which is the point of effort in each case. For this reason, a large displacement occurs in the rear direction at the center C portion of the mission member 21, and the C portion collides with the first dynamic damper 14, and this impact force causes the dynamic damper of the extension housing 5 (shaft support portion 6) to move. The base of the assembly is destroyed, and the portion shown by the imaginary line is missing from the extension housing 5.

Therefore, the output shaft 2 is no longer supported by the shaft support part 6, and the rigidity of the shaft around the universal joint 3 is reduced, so that the output shaft 2 or the propeller shaft 4 is bent at the universal joint 3 as a node. As a result, the propeller shaft 4 in the event of a collision
The occurrence of tension is prevented.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view of a power train and its mounting structure, showing an embodiment of the present invention. FIG. 2 is a partially sectional side view of the mission mount member. FIG. 3 is an explanatory plan view of the mission mount member. FIG. 4 is a front explanatory view of the mission mount member. FIG. 5 is an explanatory bottom plan view of the power train and its mounting structure shown in FIG. 1 in normal conditions. FIG. 6 is a partially sectional side view of the power train and its mounting structure shown in FIG. 1 in normal conditions. FIG. 7 is an explanatory bottom plan view of the power train and its mounting structure shown in FIG. 1 at the time of a vehicle collision. FIG. 8 is a partially sectional side view of the power train and its mounting structure shown in FIG. 1 at the time of a vehicle collision. PT...Power train, D...Dynamic damper assembly, M...Mount member, l...Transmission, 2...Output shaft, 3...Universal joint, 4...Propeller shaft , 5... Extension housing, 6... Shaft support part, End...
Mission mount member, 14... first dynamic damper, 15... second dynamic damper, 19.
...Vehicle body (side frame), 21...Minyong member.

Claims (3)

[Claims] (1) In a vehicle where a universal joint for the propeller shaft is installed immediately behind the transmission, at least one end is fixed to the vehicle body, and the part that is not fixed to the vehicle body due to interference with a part of the power train in the event of a vehicle collision. A powertrain mounting structure characterized in that a collision interference means is provided for interfering with a shaft support portion of an extension housing. (2) In the power train mounting structure according to claim 1, the collision interference means includes a transmission mount member having at least one end fixed to the vehicle body, and the extension housing due to interference with the mission mount member when the vehicle collides. A powertrain mounting structure characterized by comprising an interference member that destroys a shaft support portion in the event of a collision. (3) In the power train mounting structure according to claim 2, the collision interference member is fixed to the shaft support portion of the extension housing, while a portion thereof is disposed close to the mission mount member. A powertrain mounting structure characterized by a damper.