JPS59212551A - Shock absorber - Google Patents

Abstract

PURPOSE:To prevent the twist deformation of a cylindrical flexible film and improve the durability by rotatably forming a connecting section between a damper forming a gas chamber with a cylindrical flexible film above it and an axle side member via a bearing. CONSTITUTION:A radial ball bearing 11 or a thrust bearing is provided to the end of a cylinder 1a of a damper 1 connected to an axle side member as a rotary member, and an eye 13 fitting the axle side member is provided to a dish- like member 12 receiving an outer race. Thereby, the angular motion transmitted from the axle side member to the dish-like member 12 is reliably absorbed by the bearing 11, and the force in the twist direction is never transmitted. Therefore, the durability of its flexible film 7 is improved.

Description

[Detailed description of the invention] This invention relates to an improvement in a vibration isolator.

As a conventional vibration isolator of this type, there is one shown in FIG. 1, for example.

In the figure, 1 indicates a telescope type attenuator, and this attenuator l, which can be a conventionally known shock absorber, is
This example includes a cylinder 1a, a piston (not shown) that divides the inside of the cylinder 1a into two liquid chambers, an orifice and a valve (also not shown) provided in the piston, and a piston rod 1b fixed to the piston. I can do it.

Here, the piston rod 1b is connected to a cylindrical member 2 surrounding it.
A radial ball bearing 4 and a mount rubber 5 are sequentially attached to a shaft portion 3 which is firmly connected to a hard top wall 2a by welding or other means and protrudes outward from the broken hard top wall 2a. A bracket 6 serving as a mounting member to the vehicle body is connected therebetween. On the other hand, the cylinder 1a is connected to an axle side member as a rotating member by an eye IC provided at its lower end, and one end is connected to the outer periphery of the cylinder 1a, and the other end is connected to the outer periphery of the cylindrical member 2. The cylindrical member 2 is sealed by the cylindrical flexible membrane 7 which is airtightly fixed.
The cylinder 1a, the cylindrical member 2, and the cylindrical flexible membrane 7 constitute an air chamber 8 as an example of a gas chamber.

According to such a conventional device, the vehicle height is adjusted depending on the magnitude of the load acting on the vehicle body side, for example, by supplying and discharging compressed air to the air chamber 8, and also adjusts the vehicle height depending on the magnitude of the load acting on the vehicle body side. Frequency small-amplitude vibrations and large-amplitude vibrations are damped by the flow resistance of the liquid within the damper and the volume change of the air within the air chamber. Further, the angular movement around the axis of the cylinder 1a as shown by the arrow A in the figure, which is transmitted from the axle side to the cylinder 1a based on, for example, the steering of the vehicle, is transmitted through the cylindrical flexible membrane 7 and the cylindrical member 2. It will be absorbed by the radial ball bearing 4.

However, in this prior art, since the radial ball bearing 4 is provided at the end farthest from the rotating member connected to one end of the vibration isolator, which is the upper end in the illustrated example, the above-mentioned problem arises. When absorbing the angular motion, torsional deformation occurs particularly in the cylindrical flexible membrane 7, and as a result, the durability of the cylindrical flexible membrane 7 deteriorates.

The present invention provides a vibration isolator which advantageously solves this problem of the prior art.In particular, in a vibration isolator provided with a gas chamber, the connecting portion between the attenuator and the rotating member is By interposing a radial or thrust bearing, the angular movement of the rotating member is absorbed without being transmitted to the cylindrical flexible membrane.

The present invention will be explained below based on the drawings.

FIG. 2 is a partial sectional view showing an embodiment of the present invention.
In the figure, parts similar to those in FIG. 1 are designated by the same numbers.

In this example, a radial ball bearing 11 is provided at the end of a cylinder 1a of a damper 1, which is normally connected to an axle side member as a rotating member, and an outer race lla of this radial ball bearing 11 is received. The dish-shaped member 12 is provided with an eye 18 for attaching the axle side member, and the configuration of the other parts is as shown in FIG. 1, except that the attachment of the radial ball bearing to the shaft portion 8 is omitted. It is almost the same as

According to the vibration isolator configured in this way, vehicle height adjustment and absorption of low frequency, small amplitude vibrations and large amplitude vibrations are performed in the same manner as in the prior art.
The angular motion transmitted to radial ball bearing 1
1, and the force in the torsional direction is not transmitted to the cylindrical flexible membrane 7, so the durability of the flexible membrane 7 does not deteriorate.

Note that the radial ball bearing 11 in this example may be replaced by a radial roller bearing, a thrust bearing, or the like, and in such a case, the problem regarding the durability of the cylindrical flexible membrane 7 will be satisfactorily resolved. Furthermore, if the bearing is a thrust bearing, vibrations transmitted from the axle side member to the damper l can be advantageously dealt with.

FIG. 8 is a partial sectional view showing another embodiment of the invention.

Here, an inner cylinder 14 is projected inward from the hard top wall 2a of the cylinder member 2, and within this inner cylinder 14, the end of the piston rod lb is connected to a rubber or rubber-like elastic member 15.
By connecting the piston rod 1b and the cylindrical member 2
A plate-like member 12 provided with an eye 13 is attached to a thrust ball bearing 16 provided at the end of the cylinder IC.

According to this example, the angular movement of the axle side member attached to the eye 18 is absorbed by the thrust ball bearing 16, similar to the embodiment shown in FIG. There is no risk of this occurring.

In addition, in this example, since the piston rod 1b and the cylindrical member 2 are flexibly connected, the telescopic damper 1 can hardly attenuate the damping, and the damping force is directly transmitted from the cylinder 1a to the piston rod 1b. It is possible to sufficiently insulate the cylindrical member 2 from high-frequency, small-amplitude vibrations. That is, the telescope-type damper 1 effectively absorbs high-frequency, small-amplitude vibrations, such as those caused when a car drives on a gravel road, by using the viscous resistance of the liquid sealed therein, the inertial resistance of the cylinder 1a, the piston, and other components. However, according to this example, the vibrations transmitted from the cylinder 1a to the piston rod 1b without being effectively absorbed are caused by the elastic member 15 allowing the relative vibration of the piston rod 1b with respect to the cylindrical member 2. Since it is absorbed by the vehicle, it is not transmitted to the vehicle body and impairs the ride comfort of the vehicle.

FIG. 4 is a partial sectional view showing still another embodiment of the invention.

Here, a radial ball bearing 11, a dish-like member 12, and an eye 18 are arranged at the lower end of the cylinder 1a in the same manner as described with reference to FIG. A reduced diameter portion 2b is provided at the upper end of the cylindrical member 2, and this reduced diameter portion 2b
is separated from other parts by a stopper 17 through which the tip of the piston rod 1b passes, and a flange 18 provided on the piston rod 1b within the reduced diameter portion 2b is provided with a ring-shaped or circumferential cross-sectional shape that is approximately rhombic. The rubber or rubber-like elastic member 19 that has been cut off is fixed to the reduced diameter portion 2b without being connected to it.

According to this example, the angular movement of the axle side member is absorbed in the same manner as in the embodiment shown in FIG.
This is absorbed by the displacement of the elastic member 19 in the axial direction of the piston rod and the elastic deformation caused by contact with the hard top wall 2a and the stopper 17. Note that the elastic member 19 in this example
Unlike the elastic member 15 of the embodiment shown in FIG. 8, it is not connected to the cylindrical member 2, so that when the piston rod 1b vibrates relative to the cylindrical member 2, the deformation reaction force due to the deformation of the elastic member is generated by the cylinder. The amount of transmission to the member 2 can be reduced compared to the embodiment shown in FIG.

Although the present invention has been described above based on the illustrated examples, the present invention is also applicable to other types of gas chambers, for example, in which part or all of the top wall of the cylindrical member is formed of rubber or a rubber-like elastic member,
The present invention can also be applied to a vibration isolator that includes a gas chamber in which the tip of a piston rod is connected to the elastic member. By interposing a radial or thrust bearing in the connection between the cylindrical flexible membrane and the rotating member, the transmission of angular motion to the cylindrical flexible membrane can be sufficiently prevented, thereby increasing the durability of the cylindrical flexible membrane. This is a significant increase compared to the conventional technology.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing a conventional technique, and FIGS. 2 to 4 are partial sectional views showing embodiments of the present invention. 1...Attenuator 1a...Cylinder 1b
...Piston rod 2...Cylinder member 2a...Hard top wall 2b...Reduced diameter part 8...Shaft part
7... Cylindrical flexible membrane 8... Air chamber 11... Radial ball bearing 12... Dish-shaped member 1B... Eye 14...
・Inner cylinder 15, 19...elastic member 16
...Thrust ball bearing 17...Stopper. Figure 2 9

Claims (1)

[Claims] L A telescope type attenuator whose one end is connected to the rotating member, a cylindrical member with a top wall surrounding the piston rod of this attenuator, one end of which is connected to the cylinder of the attenuator, and the other end of which is connected to the cylinder of the attenuator. a cylindrical flexible membrane airtightly connected to each cylindrical member;
A vibration isolator comprising the cylindrical member, a cylinder, and a gas chamber formed by the cylindrical flexible membrane, characterized in that a bearing is interposed in a connecting portion between the attenuator and the rotary member. Anti-vibration device.