JPH0218363Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a drive shaft vibration damping device that is used by being attached to a drive shaft that vibrates heavily.
Particularly suitable for drive systems that transmit engine rotation to the left and right drive wheels via the clutch → transmission → differential gear → drive shaft, such as front engine/front drive or rear engine/rear drive vehicles. The present invention relates to a vibration damping device for a drive shaft.

Unlike the front engine/rear drive system, the front engine/front drive system and the rear engine/rear drive system do not have a propeller shaft, so vibrations generated by the engine and vibrations due to torque fluctuations are transmitted to the drive shaft. It is easily transferred and induces bending vibration in the driveshaft.

When the above-mentioned driveshaft resonance occurs during actual engine rotation, the vibration is transmitted from the nutcle arm to the vehicle body via suspension parts such as the shock absorber and spring, and furthermore produces a muffled sound inside the vehicle cabin, causing discomfort to the passengers. It may give you a feeling of pleasure.

A small and effective vibration device that solves the above problems includes a boss part with a center hole that is fitted into the drive shaft, a ring-shaped weight arranged concentrically with the boss part, and a ring-shaped weight arranged at equal angular intervals. an elastic coupling member formed of a plurality of rubber elastic materials, which is arranged on the inner surface of the weight and connects the boss part and the weight radially; A vibration damping device for a drive shaft is known, which includes a stopper made of a rubber elastic material that protrudes in the direction and is formed at a predetermined interval on the boss portion and the elastic coupling member to restrict the amount of expansion and contraction of the elastic coupling member. .

In this drive shaft vibration damping device, the weight and the spring constant of the elastic coupling member are set to match the resonance point of the drive shaft. and,
Attach a driveshaft vibration damping device to the driveshaft. This creates a difference in the vibrations of the drive shaft and weight, lowers the resonance point of the shaft, blocks transmission of vibration to the suspension, and improves ride comfort. Further, the stopper comes into contact with the boss when a vibration of a predetermined value or more is applied to regulate the relative distance between the boss and the weight within a predetermined value, thereby regulating the amount of expansion and contraction of the elastic coupling member.

This conventional drive shaft vibration damping device is highly effective in damping drive shaft resonance. However, stones and the like are sucked into the space formed by the predetermined interval between the stopper and the boss that constitute the vibration damping device of the drive shaft.
There was a danger that the pebble would be trapped.

The present invention was devised to prevent the above-mentioned flying stones from being sucked in and to maintain stable performance at all times.

That is, the vibration damping device for a drive shaft of the present invention connects at least a stopper and a boss portion in the direction in which the stopper protrudes while closing a predetermined distance therebetween, and connects the stopper with the boss portion in the direction in which the stopper protrudes, and connects the stopper with the boss portion in the direction in which the stopper protrudes. A thin curtain-like closing member made of a rubber elastic material is provided, and this closing member prevents flying stones from being sucked in. Here, the axial direction refers to the direction in which the shaft of the drive shaft extends and the direction parallel to this direction.

Note that the closing member may be provided not only in the space between the stopper and the boss portion but also in the space between the stopper and the elastic coupling member. The material of the closing member is a flexible rubber elastic material. In terms of performance, the thinner the thickness, the better. In terms of mechanical strength, the practical thickness is
Approximately 0.3 to 3 mm is good.

The closing member extends along an axially perpendicular plane including the axially central portion of the stopper so as not to trap stones or the like in the space between the stopper and the boss.
It is preferable that the portion where the closing member is provided is located closest to the stopper and the boss portion.
As a result, the groove-shaped space formed on both sides of the closing member has a tangle-like cross-sectional shape with wide intervals between openings. When the opening expands in this rasp-like shape,
Even if a flying stone were to be trapped, the vibration would push it out into the wide opening.

Note that the boss portion, the elastic coupling member, the stopper, and the closing member, excluding the weight, constituting the drive shaft vibration damping device of the present invention may be integrally made of a rubber elastic material such as rubber. Further, it is preferable that the ring-shaped weight is made of metal such as iron, and that the weight is covered with a rubber elastic member in order to strengthen the integrity of the weight and other components.

Examples will be explained below.

An embodiment of the drive shaft vibration damping device of the present invention is shown in FIGS. 1 and 2. FIG. 1 is a plan view of a vibration damping device for a drive shaft, and FIG. 2 is a sectional view taken along the arrow in FIG. This drive shaft vibration damping device 1 includes a metal ring-shaped weight 11.
, a cylindrical boss portion 12 , six elastic coupling members 13 arranged radially at equal intervals, and six stoppers 14 protruding from the weight 11 toward the boss portion 12 .
, a film-like closing member 15 stretched in a space surrounded by the weight 11, the boss portion 12, the elastic coupling member 13, and the stopper 14, and a band 16 that tightens the outer periphery of the boss portion 12. The boss portion 12, the elastic coupling member 13, the stopper 14 and the closing member 15 are integrally made of rubber. Further, the weight 11 is covered with the same rubber and held integrally. The closing member 15 is arranged at a substantially intermediate position with respect to the circumference of the stopper 14 in the thickness direction. And the second
As is clear from the figure, each of the recesses formed on both sides of the stopper 14 with the closing member 15 in the center has an opening in the shape of a flap. In other words, two recesses are formed on both sides of each stopper 14, the bottom of which is the surface of the closing member 15, and the bottom is narrow and the opening is wide.

In the drive shaft vibration damping device of this embodiment, since there is no space around the stopper 14 that communicates from one side of the vibration damping device to the other side, wind, etc. I can't pass by. Therefore, there is little risk of flying stones carried by the wind getting stuck in the recesses on both sides of the stopper 14. Moreover, even if a flying stone gets stuck, when the stopper 14 and the boss part 12 are expanded, the bottom of the recess connected by the closing member 15 will expand narrower than the opening. For this reason, the recess has a narrow bottom and a wide opening, so even if a stone gets stuck in the recess, the stone easily falls out of the recess. In particular, in this embodiment, even in a normal state, the shape of the recess is such that the opening is wide and the bottom is narrow, so that the stones can easily fall out due to vibration. Therefore, the vibration damping effect is always achieved as designed.

As shown in FIG. 3, this drive shaft vibration damping device 1, for example, controls the rotation of an engine 2 by a clutch 3, a transmission 4, a differential gear 5, a drive shaft 6,
It can be used in a drive device that transmits information to the left and right wheels 8 and 9 via the motor 7. Here, the engine 2 is of a horizontal type. The drive shaft vibration damping device of this embodiment is used by being attached to a long drive shaft 6 where vibrations are likely to occur.

Note that a vibration damping device 1' for a drive shaft may be used, with a plan view shown in FIG. 4 and a sectional view taken along the arrow in FIG. 4 shown in FIG. In this drive shaft vibration damping device 1', recesses 16' and 17' defined by a stopper 14', a boss portion 12', an elastic coupling member 13' and a closing member 15' have openings that are normally closed. It's not spreading. In this drive shaft vibration damping device 1', the stopper 14' and the boss part 1
2' moves away from each other relatively, the closing member 15' acts to prevent the bottoms of the recesses 16' and 17' from expanding, so that the openings of the recesses 16' and 17' open and are closer to each other than the recesses 16' and 17'. Stones fall off. However, the vibration damping device 1' of this drive shaft is
Compared to the drive shaft vibration damping device 1 shown in the figure, if stones are trapped in the recesses 16' and 17',
The effect of removing stones is weak.

[Brief explanation of the drawing]

1 and 2 show a vibration damping device for a drive shaft which is an embodiment of the present invention, FIG. 1 is a plan view thereof, FIG. 2 is a cross-sectional view taken along the arrow in FIG.
The figure is a front view of a wheel drive device equipped with one of the drive shaft vibration damping devices of this embodiment.
5 shows another modification of this embodiment, and FIG.
The figure is a plan view thereof, and FIG. 5 is a sectional view taken along the arrow in FIG. 4. 1, 1'... Drive shaft vibration damping device,
11, 11'... Weight, 12, 12'... Boss part, 1
3, 13'... Elastic coupling member, 14, 14'... Stopper, 15, 15'... Closing member, 2... Engine, 6... Drive shaft.

Claims (1)

[Claims for Utility Model Registration] (1) A boss part having a center hole that is fitted into the drive shaft, a ring-shaped weight arranged concentrically with the boss part, and a ring-shaped weight arranged at equal angular intervals and arranged at equal angular intervals. An elastic coupling member formed of a plurality of rubber elastic materials radially connects the boss portion and the weight, and an elastic coupling member that is coupled to the inner surface of the weight and protrudes toward the boss portion into the space between the adjacent elastic coupling members. A vibration damping device for a drive shaft comprising a boss portion and a stopper made of a rubber elastic material formed at a predetermined interval on the elastic coupling member and regulating the amount of expansion and contraction of the elastic coupling member, at least the stopper and the stopper. A thin curtain-shaped closing member formed of a rubber elastic material, which connects with the boss portion in the protruding direction while closing the predetermined interval, and extends along an axially perpendicular surface including the axially central portion of the stopper. A vibration damping device for a driveshaft, characterized in that it is provided with. (2) The vibration damping device for a drive shaft according to claim 1, wherein the closing member connects the stopper, the boss portion surrounding the stopper, and the elastic coupling member while closing a predetermined interval therebetween.