JPH03229011A - Power transmission of automobile - Google Patents

Abstract

PURPOSE:To suppress vertical exciting force acting upon a differential gear device by providing a mass member on one or both of front and rear ends of the rear shaft of a propeller shaft in the opposite side of the rear shaft with a joint member in between. CONSTITUTION:A sleeve 14 is installed coaxially backward from a rear end of a rear shaft 3 of a propeller shaft 1 to be used as a mass member A front end of the rear shaft 3 is connected to a front shaft 2 through a center joint member 4, and the rear end of the rear shaft 3 is connected to a differential device 9 through a rear joint member 8. Because of this mass member 14, a node can be shifted in such direction that the vertical exciting force acting upon the rear shaft is reduced. Consequently, amplification and propagation of the noise at the differential device 9 can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF THE INVENTION The present invention relates to a power transmission device for an automobile, which is centered around a propeller shaft.

2. Description of the Related Art As shown in FIG. 6, a propeller shaft 1 is formed by interconnecting a front shaft portion 2 and a rear shaft portion 3 via a center joint member 4. The front end of the front shaft portion 2 is connected to the output shaft of the 17726 transmission 7 via the front joint member 5, while the rear end of the rear shaft portion 3 is connected to the differential gear via the rear joint member 8. It is known that it is connected to 9 (for example, in 1986
-67441 and Utility Model Application Publication No. 62-196730).

In such a structure, the propeller shaft 1
is divided into two parts at the front and back to form three joint members 4.5.8
It is generally referred to as a three-joint type because of the presence of a center joint member 4 in the front shaft portion 2, and is supported by the vehicle body 11 through a center bearing device 10 at a position immediately in front of the center joint member 4.

12 and 13 indicate front and rear wheels.

Problem to be Solved by the Invention When looking at the relationship between the constraint conditions at both ends of the rear/set section 3 and the vibration mode in the structure shown in FIG. As shown in (B), when points a and b inside the joint member 4°8 are taken as note points, a downward bend occurs in the shaft part 3, and this bending force generates an excitation force in the 'FJj direction. Therefore, there is a problem in that so-called differential noise such as gear meshing noise in the differential device 9 is particularly amplified.

The present invention was made in view of the above problems.
The purpose of I:1 is to reduce the vibrational force in the direction by aligning the /-d point of the bending vibration motor of the rear/set part with the position of the front and rear nocoindo members of the rear shaft part. The objective is to provide a structure that suppresses differential noise and thereby improves the differential noise.

Means for Solving the Problems As described above, the present invention provides a propeller shaft in which the front shaft part and the rear/set part are connected to each other via the 1128 member, and the front end of the front shaft part is In an automobile power transmission system, the rear end of the rear shaft section is connected to the output shaft of the transmission via a joint member, and the rear end of the rear shaft section is connected to the tiphalen noyal device via the joint member. The invention is characterized in that a mass member is provided on either one of the ends, sandwiching the joint member at the corresponding end and positioned closer to the opposite shaft than the joint member.

According to the structure described above, for example, as shown in FIG. The point is moved rearward by Q and coincides with the rear joint member 8 compared to the conventional case. As a result, the vertical excitation force acting on the differential device through at least the rear joint member 8 is suppressed, and so-called differential noise can be improved.

Embodiment FIG. 1 is a diagram showing a first embodiment of the present invention, and parts common to FIG. 6 are given the same reference numerals.

As shown in FIG. 1, from the rear end of the rear/set part 3 of the propeller shaft 1 toward the rear thereof, the TI'i1 member is positioned on the same axis -L as the rear shaft part 3. A shaped sleeve 14 is integrally formed to protrude, and the weight and shape of the sleeve 14 itself are set so that the center of gravity of the sleeve 14 is located rearward of the central axis 15 of the rear joint member 8 on the axis of the rear shaft portion 3. It is. 16 indicates the input shaft of the differential device 9.

According to the structure of this embodiment, as is clear from a comparison between FIG. 2(B) and FIG. It is now possible to move the rear joint member 8 by a larger distance and to match the rear joint member 8.

As a result, at least one of the node points coincides with the position of the rear adjustment member 8 as described above.
The vertical excitation force acting on the differential device 9 due to the vibration of the propeller shaft 1 is significantly suppressed, and the amplification and propagation of noise in the differential device 9 is prevented, resulting in so-called differential noise.

In the embodiment shown in FIGS. 3(A) and 3(B), a link river 9 as a mass member is attached to the end surface of a sleeve 17 integrally attached to the rear end of the rear/set part 3 via a rubber elastic body 18. It is equipped with.

In this embodiment as well, since the ring 19 functions as a tie-back ring, the same effects as in the first embodiment can be obtained.

In the embodiment shown in FIG. 4, a first
A sleeve 20 as a mass member is provided by a method similar to that shown in the figure. In the case of this embodiment, since the other note point a can be made to coincide with the position of the center joint member 4, the vibrational force in the downward direction of 1L acting on the center hair ring device 10 can be particularly suppressed, and the so-called This has the advantage that the amplification and propagation of differential noise can be suppressed and at the same time the load on the center hair ring device 10 can be reduced.

Further, in the embodiment shown in FIG. 5, rear/back) ffi<
Sleeves 14 and 20 as mass members shown in FIGS. 1 and 4 are attached to both rear ends of iii.

In this embodiment, since the note point a on one side can be made to correspond to the rear/finish member 8 and the note point a on the other side can be made to correspond to the center/three point member 4, the -1- This makes it possible to significantly suppress the excitation force in the forward direction, and thus the amplification and propagation of differential noise.

EFFECTS OF THE INVENTION As described above, according to the present invention, since there is a mass member, it is possible to move the 7-point point in the direction in which the excitation force of the rear shaft part in the 1st direction becomes smaller. ” From becoming Noh,! - By suppressing the amplification and propagation of the differential noise caused by the excitation force mentioned above, the differential noise can be significantly improved and the T knee C can be reduced.

[Brief explanation of drawings]

FIG. 1 is a configuration explanatory diagram showing the first embodiment of the present invention;
The figure is an explanatory diagram of the bending vibration mode of the power transmission system centered on the propeller shaft, FIG. 3 (Δ) is an explanatory diagram of the configuration showing the second embodiment of the present invention, and FIG. The explanation of the bending vibration motor in A) is 1, FIG. 4 is an explanatory diagram of the bending vibration motor showing the third embodiment of the present invention, and FIG.
Fig. 6 is a schematic configuration diagram of a power transmission system with propeller/naft (41 cores). Department,
3-Rear shaft part, 4 Sentan yoint member, 5
・Front yoint member, 7...Transmission, 8 Rear yoint member, 9. Tefalenoyel device, 14.2
0 - Sleeve as a mass member, )9 - Ring as a mass member. Figure 2 Figure 0 Figure 1 Figure 1

Claims (1)

[Claims] (1) It has a propeller shaft in which the front shaft part and the rear shaft part are connected to each other through a joint member, and the front end of the front shaft part is connected to the output shaft of the transmission through the joint member, and the rear shaft part is connected to the output shaft of the transmission through the joint member. In a power transmission system for an automobile in which the rear ends are each connected to a differential device via a joint member, the joint member at the corresponding end is sandwiched between at least one of both ends of the rear shaft portion. A power transmission device for an automobile, characterized in that a mass member is provided on a side opposite to a rear shaft portion.