JPH01317831A - Propeller shaft supporting device of automobile - Google Patents

Abstract

PURPOSE:To obtain smooth rapping of inserts and load deflection characteristic by forming a protrusion on an elastic body provided between an external tube fixed at a car body and an internal tube supporting a center bearing and setting the height of the protrusion such as to be larger at the lower side. CONSTITUTION:A supporting device is composed of an internal cylinder 3 for holding a center bearing 2 fixed at a propeller shaft 1, an external tube 5 installed on a car body and an elastic body 4 provided between the internal and external tubes. Before assembling these, the central line X of the internal tube 3 is offset by the fixed measure upward from the central line Y of the external tube 5. A protrusion 6 protruding diagonally from the outer periphery of the internal tube toward the inner peripheral surface of the external tube 5 is formed on the elastic body 4. Before assembling, the protrusion 6 is set such that the central line of its tip is united with the central line Y of the external tube and its height is large at the lower part, H and smaller at the upper part (h).

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a propulsion shaft support device used for supporting the propulsion shaft of an automobile.

Conventional technology An automobile propulsion shaft support device t"z is used to support the propulsion shaft on the vehicle body, and consists of an outer cylinder attached to the vehicle body, an inner cylinder that holds a center bearing, and the outer cylinder and cylinder. An elastic body is provided between the two.

This example will be explained with reference to FIGS. 3 to 6. A center bearing 2 is attached to the outer periphery of the propulsion shaft 1, and an inner cylinder 3 for holding the center bearing 2 is provided on the outside of the center bearing 2.

Further, a rubber body 4 is integrally molded on the outer periphery of the inner cylinder 3, and an outer cylinder 5 that is attached to the vehicle body panel is attached to the rubber body 4.
is integrally molded.

The rubber body 4 is provided with a protrusion 6 for a stopper from the inner cylinder 3 side toward the outer cylinder 5. It is shown on page 297 of ``Complete Book Volume 9, Power Transmission Device''.

By the way, in this type of propulsion shaft support device, the center line X of the inner cylinder 3 and the center line Y of the outer cylinder 5 are made to coincide with each other as shown in FIG. 5 when the propulsion shaft l is supported. to 1
Before assembly, as shown in FIG. 4, the center line X of the inner cylinder 3 is offset above the center line Y of the outer cylinder 5 (offset -IZ).

In the past, vibrations caused by rotation perpendicular to the propulsion shaft either acted on the inner cylinder 3 via the center bearing 2, or did not act on the outer cylinder 5 due to the cushioning effect of the rubber body 4, and were transmitted to the vehicle body. There isn't.

In addition, if the inner cylinder 3 becomes larger than the clearance C from the tip of the protrusion 6 to the inner circumferential surface of the outer cylinder 5, the stopper action of the protrusion 6 provided on the rubber body 4 will cause the above-mentioned This controls the feel of the inner cylinder 3.

Problems to be Solved by the Invention Is it possible to control the occurrence of a large vibration in the inner cylinder 3 by the stopper action of the protrusion 6 provided on the rubber body 4? Since the load-sweeping characteristics before contacting the outer cylinder 5 and the load-deflection characteristics after contacting the protrusion 6 or the outer cylinder 5 are different, it is necessary to make a smooth transition as shown by the solid line in FIG. 6. The problem is that it is not possible.

On the other hand, it would be better to increase the height of the protrusion 6 so that it comes into smooth contact with the outer cylinder 5. However, if this is done, the protrusion 6 can be made to come into contact with the outer cylinder 5 smoothly. A problem arises in that the clearance C between the strip 6 and the outer cylinder 5 becomes smaller, making it impossible to secure a sufficient dimension for removing the core.

Therefore, this invention provides a support for the propulsion shaft of an automobile that provides smooth load-to-stamp characteristics without interfering with core mold-cutting, etc.! ! This is to provide a convenient location.

Means for Solving the Problems In an automatic propulsion shaft support device in which an elastic body is provided between an outer cylinder attached to one body and a cylinder holding a center bearing, the axis is lower than the center line of the outer cylinder. The center line of the inner cylinder is arranged with an upper mK offset, and a stopper protrusion is provided on the elastic body toward the outer circumferential surface of the inner cylinder or the inner circumferential surface of the open sea, and the protrusion height of this protrusion is greater than the upper side. The lower side is also set larger.

Since the height of the protrusion on the lower side of the action is set large, the stopper action by the protrusion is made smooth, and the center line of the inner cylinder is aligned with the center IIi of the outer cylinder [as opposed to the center line because it is offset upwards]. It is possible to secure a margin for cutting out child molds, etc.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, with the same reference numerals assigned to the same parts as in the conventional structure.

Figure 1 is a sectional view before assembly, and the second figure is a sectional view after assembly.

In FIG. 2, the propulsion shaft support device is provided between an inner cylinder 3 that holds the center bearing 2 attached to the propulsion shaft l, an outer cylinder 5 that is attached to the vehicle body, and the inner cylinder 3 and the outer cylinder 5. It has a rubber body 4 as an elastic body, and the assembly is 1 at the front, and the inner cylinder 3
The center line
), and the above-mentioned center lines X and Y coincide after one assembly, which is the same as in the prior art.

Here, the rubber body 4 is bent in a 0-shape and attached between the inner cylinder 3 and the outer cylinder 5, and is inclined obliquely from the outer peripheral part of the inner cylinder 3 toward the inner peripheral surface of the outer cylinder 5. A protruding ridge 6 is provided.

The protrusion 6 is set so that the center line of its tip portion substantially coincides with the center line Y of the outer cylinder 5 before assembly, and therefore the height of the protrusion 6 is set at the lower side. big(
The height H) is set smaller (height h) on the upper side.

In addition, before assembly, the clearance C between the tip of the protrusion 6 and the inner circumferential surface of the outer cylinder 5 is kept constant, and this clearance C is set to a size necessary for the removal allowance for the core. The assembly is set so that the tip of the lower protrusion 6 (i& is also a portion with a large protrusion height) does not come into contact with the inner circumferential surface of the outer cylinder 5 later.

Therefore, after assembly, the clearance CI on the upper side of the protrusion 6 and the clearance C1 or C on the lower side of the protrusion 6,
>C.

According to the structure of the above embodiment, the protrusion height of the protrusion 6 is set to be large at the lower part thereof, and the clearance C8 between the protrusion 6 and the inner circumferential surface of the outer cylinder 5 is small. When the deflection becomes large, the upper part of the protrusion 6 comes into contact with the inner circumferential surface of the outer cylinder 5 before the upper part of the protrusion 6, and therefore, a smooth load-deflection characteristic can be obtained with respect to the deflection of the inner cylinder 3 (the broken line in Fig. 6). ).

In addition, the protruding height of the lower part of the protrusion 6 is large, and the clearance C1 after one assembly is small. This is due to the fact that the protruding height of the protruding ridge 6 is large because it is approximately aligned with @Y and a clearance C is secured between the inner circumferential surface of the outer cylinder 5 and the allowance for removing the core mold. Manufacturing problems can be avoided.

In this way, while solving manufacturing problems.

The desired load-deflection characteristics are obtained.

Note that the present invention is not limited to the above-mentioned embodiments; for example, the protrusions may be formed from the outer cylinder side toward the outer circumferential surface of the cylinder.

As described in detail, according to the present invention, by appropriately setting the protrusion height of the protrusion, the lower side of the protrusion can be brought into contact with the upper side before the protrusion. A smooth stopper action is achieved by the portion with a large protruding height, which has the effect of providing a smooth stopper action.

In addition, at the front of the assembly, the center line of the outer cylinder is set higher than the center line of the inner cylinder, so the clearance between the tip of the lower protrusion and the outer cylinder or cylinder is correspondingly large. This has the effect that a sufficient amount of clearance for removing the core mold during manufacturing can be ensured, and no manufacturing problems occur.

[Brief explanation of the drawing]

1.2 shows an embodiment of the present invention, FIG. 1 is a sectional view before assembly, and FIG. 2 is a sectional view after assembly. Figure 3 is a sectional view of the conventional assembly, and Figure 4.5 is a cross-sectional view of the conventional assembly. FIG. 6 is a sectional view corresponding to FIG. 1.2 of the prior art, and a graph diagram. 2... Center bearing, 3... Inner cylinder, 4...
Rubber body (elastic body), 5...Outer cylinder, 6...Protrusion, X.
・・Center line of inner cylinder, Y・・・center line of outer cylinder, H, h・・
・Protrusion height. External 2 people 1st cause 6 ---- Jakuji X -----1 Inner angle of Kō・Shikiryo y -------Central ring for external use H, h ---・Kojiajimapo Figure 4 fart

Claims (1)

[Claims] (1) In an automobile propulsion shaft support device in which an elastic body is provided between an outer cylinder attached to the vehicle body and an inner cylinder holding a center bearing, the center line of the inner cylinder is lower than the center line of the outer cylinder. is arranged offset on the upper side, and a protrusion for a stopper is provided on the elastic body toward the outer circumferential surface of the inner cylinder or the inner circumferential surface of the outer cylinder, and the protrusion height of this protrusion is on the lower side than on the upper side. A propulsion shaft support device for an automobile, characterized by having a large diameter.