JPH0478342A - Mount with vibration damper - Google Patents

Abstract

PURPOSE:To increase a damping factor when the acceleration of a loaded load is large and reduce when it is small by parallelly arranging a suspension spring and a damper, and providing a tapered cross-section-variable orifice part in the hole of a damper cylinder. CONSTITUTION:In the small acceleration condition of the acceleration of a load loaded with a suspension body 6, a piston head 2a reciprocates in a small acceleration range A because of the small displacement of a suspention spring 5. A damping factor is small in the range A because of the large cross-section area of a cross-section-vbariable orifice part 3. In a large acceleration condition, the piston head 2a reciprocates in the large acceleration range C because of the large displacement of the suspention spring 5. The damping factor is large in the range C because of the small cross-section area of the cross-section- variable orifice part 3. The range B is an interpolation part for the intermedciate part of he ranges A and C, and the variation of the damping factor can be optionally set by adjusting the variation of the cross-section shape of the part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mount with a vibration damper applied to aircraft, automobiles, etc.

[Conventional technology]

Some conventional mounts change the attenuation rate by changing the orifice diameter using an electric actuator, but there are no other mounts that make the attenuation rate variable.

[Problem to be solved by the invention]

In conventional mounts, the damping rate is constant, so if the acceleration as a condition for determining the damping rate is determined by the expected maximum acceleration, the impact buffering ability in the slight acceleration state is low, and the It causes high stress on the object and has an adverse effect on it.

Additionally, if the damping rate is determined under small acceleration conditions, problems such as the suspension device (spring-damper system) bottoming out under large acceleration conditions and resonance occurring under repeated input acceleration conditions (i.e., vibrating conditions) may occur. was there.

In order to solve the above-mentioned problems, the present invention attempts to provide a mount whose damping rate changes depending on acceleration such that the damping rate becomes large under large acceleration conditions and large acceleration vibration conditions, and becomes small under small acceleration conditions. It is something to do.

[Means to solve the problem]

The mount with a vibration damper of the present invention has a piston whose one end is connected to an upper frame structure and whose other end is provided with a piston head, and into which the piston is inserted and has a variable cross-section orifice portion tapering downward. It is characterized in that it is formed by a damper made of a damper cylinder having a hole provided therein, and a suspension spring that is arranged parallel to the damper and whose upper end is connected to the suspension member.

[Effect]

In the above, when the acceleration of the load applied by the suspended object is small, the displacement of the suspension spring is small, so the piston head reciprocates in the small acceleration range where the cross-sectional area of the variable cross-section orifice part of the damper cylinder is large, and the damper is damped. rate is small. In addition, since the displacement of the wide spring is large in a state of high acceleration, the piston head reciprocates in the high acceleration range where the cross-sectional area of the variable cross-section orifice part of the damper cylinder is small.
Its attenuation rate is large.

As a result of the above, it is possible to realize a mount that has a large damping rate when the acceleration of the load applied by the suspended object is large, and a small damping rate when the acceleration is small.

Two examples: An embodiment of the present invention is shown in FIGS. 1 and 2.

In this embodiment shown in FIGS. 1 and 2, one end is upward! A damper having a piston 2 connected to a bridge 6 and provided with a piston rod 2a at the other end of the piston, and a hole 1a into which the piston 2 is inserted and provided with a downwardly tapering variable cross-section orifice portion 3. Damper 7 consisting of cylinder 1
, and a suspension spring 5 which is arranged parallel to the damper 7 and whose upper end is connected to the suspension member 6, and the cross-sectional shape of the hole 1a of the damper cylinder 1 is as shown in FIG. It has a cocoon-like shape, and the lower part is circular, and the inside is filled with hydraulic oil 4.

In the above, when the acceleration of the load applied by the suspended object 6 is small, the displacement of the suspension spring 5 is small;
The piston head 2a reciprocates under the small acceleration condition 8 shown in FIG. In this range A, the cross-sectional area of the variable cross-section orifice portion 3 is large, so the attenuation rate is small.

Furthermore, in a state of high acceleration, the displacement of the suspension spring 5 is large, so the piston head 2a reciprocates in the high acceleration range C shown in FIG. In this range C, the cross-sectional area of the variable cross-section orifice portion 3 is small, so the attenuation factor is large.

Range B shown in FIG. 1 is a part interpolated between ranges A and C, and by adjusting the change in the cross-sectional shape of this part, the change in the attenuation rate can be arbitrarily set.

According to item 1, the cross-sectional area of the variable cross-section orifice part is small when the load is under a large acceleration condition, and large when the load is under a small acceleration condition. realizes a mount with a small damping rate.

C. Effects of the Invention] The mount with a vibration damper of the present invention has a suspension spring and a damper arranged in parallel, and the hole in the damper cylinder of the damper is provided with a variable cross-section orifice portion tapering downward. , to realize a mount that has a large damping rate when the acceleration of the load applied by the suspended object is large, and a small damping rate when the acceleration is small.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention, and FIG. 2 is a view taken along arrows -■ in FIG. 1... Damper cylinder, 2... Piston, 2
a... Piston head, 3... Variable cross section orifice portion, 4... Hydraulic oil,
5... Suspension spring, 5... Suspension object, 7... Damper

Claims (1)

[Claims] It consists of a piston whose one end is connected to an upper frame structure and whose other end is provided with a piston head, and a damper cylinder which has a hole into which the piston is inserted and is provided with a variable cross-section orifice portion tapering downward. A mount with a vibration damper, characterized in that it is formed by a damper and a suspension spring arranged parallel to the damper and whose upper end is coupled to the suspension structure.