JPH07127683A - Liquid-seal type mount device - Google Patents

Abstract

PURPOSE:To provide a liquid-seal type mount device which can damp vertical oscillation without being damaged even though a large displacement is caused by a high load, and which can exhibit a function of satisfactorily damping rolling. CONSTITUTION:In a liquid-seal type mount device, a load bearing coil spring 5 is interposed between a damping plate 2 and the bottom 1a of a cylindrical housing 1 secured at its upper end part with a resilient cylinder 6 whose inner periphery is fitted therein with a stud 3 through the intermediary of a sleeve 7, in the axial direction thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration mounting device for holding a cab on a chassis of a construction machine such as a power shovel with anti-vibration properties, and particularly for shock absorption even when a large load is applied. It is intended to keep the action.

[0002]

2. Description of the Related Art In a construction machine such as a power shovel as well as an ordinary vehicle or truck, a mount device is interposed between the chassis side and the cab side so as to prevent the shock from being transmitted to the cab side. Construction machinery used to be considered to be durable and not to be broken, but recently, habitability, operability, and riding comfort of passengers have been required to be as good as passenger cars. Conventionally, a liquid-filled mount device using an elastic body and a high-viscosity damping liquid as a cab mount has been known (Japanese Utility Model Laid-Open No. 64-11450). As shown in FIG. 2, this liquid-filled mount device has a cylindrical elastic body c interposed between a stud a attached to the cab and a casing metal fitting b attached to the chassis side, and a casing of the cylindrical elastic body c. The joint surface to the metal fitting is press-fitted. Further, a damping plate d is attached to the lower end of the stud a, and a silicone oil e is sealed in a space inside the casing fitting where the damping plate d is provided.

Further, the present applicant has proposed a mount device in which a large damping force is obtained in the vertical direction by increasing both tan δ and the damping coefficient in a wide frequency range in terms of damping property (actually, Kaihei). 4-101835). In this case, the tubular elastic body is baked and adhered in the tubular casing metal fitting, the stud is baked and adhered in the central hole of the cylindrical elastic body, and the damping plate is attached to the lower end of the stud.
A high-viscosity damping liquid is sealed inside a casing that houses the damping plate. The tubular elastic body and the damping plate cushion the load direction, and the tubular elastic body cushions the lateral direction.

[0004]

Various liquid-filled mounts are known as in the prior art, but a stud having a damping plate attached thereto is adhered to the inner circumference of the tubular elastic body. Since the outer periphery of the stud is held in the casing, there is a problem that when a large load is applied to the stud, the stud is largely displaced and a large shearing force is applied to the tubular elastic body, and the tubular elastic body is easily damaged. . Therefore, it is an object of the present invention to provide a liquid-filled mount device capable of buffering in the up-and-down direction without being damaged even when subjected to a large load and a large displacement, and having a sufficient buffering action against rolling. To do.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a damping plate is attached to the lower end of a stud that supports a shock-absorbing body, the damping plate is housed in a cylindrical housing having a bottom, and a viscous material is contained in the cylindrical housing. The above object has been achieved in a mounting device in which a liquid is sealed. That is, a load supporting spring is provided between the damping plate and the bottom of the tubular housing, the elastic tubular body is fixed to the upper part of the tubular housing, and the stud is attached to the inner circumference of the elastic tubular body through a sleeve. It was fitted so that it could slide in any direction. Further, stoppers made of elastic bodies are provided at the vertically opposing positions of the damping plate so that the vertical movement amount of the damping plate can be regulated.

[0006]

In the liquid-filled mount device for construction machinery of the present invention, a spring is provided between the damping plate and the bottom of the tubular housing, and a sleeve is interposed between the stud and the elastic tubular body to allow sliding. Therefore, even if a large load is applied to the stud, the stud is supported by the spring and no load is applied to the elastic cylindrical body, so that the elastic cylindrical body is not damaged.
The damping in the vertical direction is performed by the damping plate and the spring, which is desirable. Further, the stud can move up and down in the sleeve, and the elastic cylindrical body provided on the outer periphery of the stud acts as a cushioning effect on the stud in the lateral direction.

[0007]

EXAMPLE An example of the present invention will be described with reference to FIG. 1, but the present invention is not limited to this example. In the liquid-filled mount for a construction machine, a damping plate 2 is provided in a cylindrical housing 1 having a bottom 1a so as to be vertically movable.
The stud 3 is mounted on the stud 3 by a bolt 3a, and the stud 3 is mounted on the upper portion of the stud 3 on a shock-absorbing body such as a vehicle cab. The damping plate 2 is formed in a disk shape having a diameter slightly smaller than the inner diameter of the cylindrical housing 1, and in the present embodiment, the damping plate 2 is provided with an orifice hole 4 which penetrates vertically. In addition, a viscous liquid L such as silicone oil is enclosed in the cylindrical housing 1, and when the damping plate 2 moves up and down,
The viscous liquid L passes through the outer peripheral portion of the damping plate 2 or the orifice hole 4 so that the vertical impact acting on the stud 3 can be buffered. A coil spring 5 is provided between the damping plate 2 and the bottom of the cylindrical housing 1,
As a result, a large load acting on the stud 3 can be counteracted and shock can be buffered. The upper and lower ends of the coil spring 5 are respectively the cylindrical housing 1
Is connected to the bottom 1a and the damping plate 2. Instead of the coil spring 5, various types of springs such as a known conical coil spring, a bamboo shoot spring, and a spring in which a large number of spring plates are stacked can be applied.

An elastic cylindrical body 6 made of rubber, resin or the like is attached to the upper part of the cylindrical housing 1 to absorb a lateral impact on the stud 3, and the inner periphery of the elastic cylindrical body 6 is attached to the stud 3.
Is designed to penetrate. A sleeve 7 is attached to the inner circumference of the elastic cylindrical body 6 so that the stud 3 is in airtight contact with the inner circumference of the sleeve 7 and can slide up and down. The outer peripheral surface of the elastic tubular body 6 is fixed to the inner periphery of the tubular mounting member 8 attached to the upper peripheral edge of the tubular housing 1 by being bonded. Further, a bellows 9 is integrally connected to the lower end of the elastic cylindrical body 6 to seal the viscous liquid L around the damping plate 2 so as not to leak out from the gap between the stud 3 and the sleeve 7.

Further, a ring-shaped stopper 10 made of an elastic body is integrally extended in the radial direction on the upper end of the elastic cylindrical body 6, and a stopper plate 3b provided on the upper portion of the stud 3 hits the lower end of the stud 3. The amount of movement to A mounting plate 11 is fixed between the ring-shaped stopper 10 and the flange portion of the mounting member 8, and the mounting plate 11 is fixed to the chassis side of the vehicle.

An annular stopper 12 made of an elastic material such as rubber is provided on the bottom 1a of the cylindrical housing 1 so as to regulate the amount of downward movement of the damping plate 2. The annular stopper 12 is formed by extending a thin-walled tubular cushioning member 13 upward from the upper end of the annular stopper 12, and the tubular cushioning member 13 is adhered to the inner peripheral surface of the tubular housing 1 so that the damping plate 2 is attached to the inner peripheral surface of the tubular housing 1. I am trying to prevent it from being hit and damaged.
An annular stopper 14 made of an elastic body is provided between the upper portion of the tubular housing 1 and the tubular mounting member 8 to regulate the amount of upward movement of the damping plate 2. The bottom 1a of the cylindrical housing 1 has a hole for injecting the viscous liquid L, and the hole is closed by a plug 15.

[0011]

According to the liquid-filled mount device of the present invention, a coil spring is provided between the damping plate and the bottom of the tubular housing to counter the load, and the stud is an elastic tubular body. Since it slides in the sleeve adhered to the inner circumference of the elastic cylinder, the elastic cylinder is not damaged even when a large load is applied. Further, since the elastic cylinder is provided on the outer periphery of the stud, it is possible to absorb a lateral impact. further,
Since the stoppers are provided above and below the damping plate, the damping plate does not move up and down by a predetermined amount or more, and damage to a large load or a very large impact can be prevented.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a liquid-filled mount device for construction machinery according to the present invention.

FIG. 2 is a sectional view of a conventional liquid-filled mount device.

[Explanation of symbols]

 1 Cylindrical housing 2 Damping plate 3 Stud 5 Coil spring 6 Elastic cylinder 12 Annular stopper 14 Annular stopper

Claims (2)

[Claims] 1. A mounting device in which a damping plate is attached to a lower end of a stud for supporting a buffered body, the damping plate is housed in a cylindrical housing having a bottom, and a viscous liquid is sealed in the cylindrical housing. A spring for supporting the load is provided between the damping plate and the bottom of the tubular housing, the elastic tubular body is fixed to the upper part of the tubular housing, and the stud is axially attached to the inner circumference of the elastic tubular body through the sleeve. A liquid-filled mount device characterized by being slidably fitted. 2. The liquid-filled mount according to claim 1, wherein stoppers made of an elastic body are provided at positions vertically opposed to the damping plate so that the vertical movement amount of the damping plate can be regulated.