JP2686654B2 - Lift hydro mount - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention is capable of adjusting the height and providing a comfortable ride when supporting a cab of a large vehicle under heavy load or an industrial machine. The present invention relates to a lift hydromount capable of supporting well.

[Prior Art] A coil spring is used or hydraulic pressure is used in order to hold a cab of a large vehicle or an industrial machine at a predetermined height and buffer vibrations and impacts caused by traveling or vibrations caused by engine driving. A shock absorber or mount is used.

In a mount using hydraulic pressure, an elastic plate attached to a support shaft is attached inside a case, and a load is supported by the rigidity of the elastic plate. Further, a damping liquid is enclosed under the elastic plate in the case, and when the mount is subjected to an impact, the damping liquid is caused to flow by flowing from the pressure chamber to the branch chamber through the throttle passage to provide a buffering action. . More recently, there is also a mount in which a large number of curved recesses are provided in the throttle passage to prevent noise during the buffering action when the damping liquid flows through the throttle passage (Japanese Patent Laid-Open No. Sho 60). -21141).

[Problems to be Solved by the Invention] When a large load such as a cab of a large vehicle is held by a spring, the holding height changes due to a change in the load, which is not convenient for driving. Further, the mount using air pressure can reduce the natural frequency in order to improve riding comfort, but has a problem that sufficient damping force cannot be obtained.

On the other hand, a mount or shock absorber that uses hydraulic pressure can have a damping force, but if the spring constant is increased in order to hold a large load, the natural frequency also increases and the ride comfort deteriorates. there were. Further, in the conventional mount, the load acting on the support shaft is held by the elastic plate, but since a large impact is applied to the mount, there is a problem that the mount is cracked and damaged when used for a long time.

In view of this, the present invention supports a supporting shaft with a rolling diaphragm through a support plate, and elastically deforms an elastic plate having a diaphragm in a liquid chamber that applies hydraulic pressure to the rolling diaphragm, so that a sudden impact acting on the supporting shaft is generated. The purpose of the present invention is to make the mount have an excellent cushioning function and to be durable by absorbing high frequency vibrations by elastic deformation of the elastic plate.

[Means for Solving the Problem] In the lift hydromount of the present invention, a rolling diaphragm and a diaphragm plate are mounted in a case with an opening at the upper end with a space therebetween to form a liquid chamber between the rolling diaphragm and the diaphragm plate. In addition, an air chamber is formed between the diaphragm panel and the bottom wall of the case, a supporting shaft is attached to the rolling diaphragm via a supporting plate, and the upper end of the supporting shaft can be projected from the opening of the case to be connected to the supported member. It is like this. The liquid chamber was divided into upper and lower parts by an elastic plate having a throttle passage, the air chamber was connected to a pressure source via an opening / closing valve, and the valve element of the opening / closing valve was connected to a diaphragm plate via a connecting rod. Further, a through hole is provided to connect the air chamber to the atmosphere so that the valve body is opened when the valve body is raised. If a guide rod is provided in the center of the upper surface of the diaphragm board and the guide rod is inserted into the guide hole provided in the elastic board, the valve element of the opening / closing valve will not tilt and its opening / closing operation will be reliable. It can prevent damage.

[Operation] In the lift hydromount of the above means, when a small load is applied to the support shaft, the support shaft is held by the liquid pressure in the liquid chamber that acts on the rolling diaphragm attached to the support shaft, and when a shock occurs, As the rolling diaphragm deforms and descends, the liquid flows through the throttle passage, and the shock is damped. Also, when a sudden shock or high-frequency vibration acts on the spindle, the diaphragm of the elastic plate may be locked and the rolling diaphragm may not extend, so vibration and shock may be transmitted.In this case, the elastic plate is elastic. It deforms and absorbs vibration.

When a large load is applied to the support shaft, most of the liquid in the upper liquid chamber flows into the lower liquid chamber through the throttle passage, so that the diaphragm plate is largely lowered. Due to this lowering, the on-off valve opens, air enters from the pressure source into the air chamber, the internal pressure of the air chamber rises, and the diaphragm disk is pushed up. Therefore, the pressure in the liquid chamber rises, the fluid in the lower liquid chamber can be returned to the upper liquid chamber, and the rolling diaphragm can be pushed up to hold the support shaft at a predetermined height.

Also, when the load acting on the support shaft becomes small, the diaphragm plate rises above a predetermined level and the through hole that communicates the air chamber with the atmosphere opens, lowering the internal pressure of the liquid chamber and raising the support shaft too much. And cushioning with a comfortable ride is possible.

[Embodiment] An embodiment of the present invention will be described with reference to the drawings.

A rolling diaphragm 2 and a diaphragm board 3 are provided in order from the upper side in a cylindrical case 1 having an upper end opening, and a liquid chamber 4 is provided between the rolling diaphragm 2 and the diaphragm board 3.
And an air chamber 5 is formed between the diaphragm plate 3 and the case bottom wall 1a.

The rolling diaphragm 2 is formed of a cloth-like material that does not stretch but is easily deformed, and the outer peripheral edge portion thereof is the case 1
Fixed to A support plate 7 having a support shaft 6 projecting from it is attached to the upper surface of the rolling diaphragm 2, and the rolling diaphragm 2 is bent between the inner wall of the case 1 and the support plate 7 so that it can be vertically deformed. The support plate 7
Is formed of a rigid body such as metal, and a peripheral wall 7a is provided on the outer periphery thereof to guide the bending of the rolling diaphragm 2. The support shaft 6 projects from the opening at the upper end of the case 1 and is connected to the supported body.

An elastic plate 8 is provided in the liquid chamber 4 so that the liquid chamber 4 has an upper chamber.
It is divided into 4a and lower chamber 4b. The elastic plate 8 is made of an elastic material such as rubber and is configured to elastically deform and buffer when the upper chamber 4a is suddenly impacted and the throttle passage 9 described later is in a locked state. A spiral throttle passage 9 that connects the upper chamber 4a and the lower chamber 4b to each other is provided on the outer peripheral portion of the elastic board 8, and the liquid filled in the liquid chamber 4 flows through the throttle passage 9 to generate an impact force on the spindle 6. Can be buffered. Further, a guide hole 8a is provided at the center of the elastic board 8 so that a guide rod 16 which will be described later penetrates.

The diaphragm plate 3 is made of an elastic material and is elastically deformable, and has a hard disk 11 such as an iron plate at the center thereof.
And the diaphragm plate 3 is lowered when the liquid enters from the upper chamber 4a to the lower chamber 4b.

An opening / closing valve 12 is provided at the center of the case bottom wall 1a, and the opening / closing valve 12 is connected to a pressure source 13 such as an air tank so that air can flow into the air chamber 5. The valve body 12a of the on-off valve is pushed in the closing direction by the spring 14, and the valve body 12a is connected via the connecting rod 15 to the disk 11 of the diaphragm disk 3.
Linked to Therefore, when a large load is applied to the support shaft 6, most of the liquid enters the lower chamber 4b, the diaphragm plate 3 is lowered below a predetermined level and the on-off valve 12 is opened, and the air chamber 5 is opened.
The internal pressure is increased by the pressure source 13 and the diaphragm plate 3
Is raised and the support shaft 6 is further raised, so that the support shaft will not be lowered too much. Further, a guide rod 16 is provided at the center of the upper surface of the diaphragm plate 3, and the guide rod 16 is penetrated into the guide hole 8a of the elastic plate 8 to eliminate the inclination of the connecting rod 15 accompanying the ascent and descent of the diaphragm plate 3, The opening / closing operation of the body 12a can be reliably performed.

The casing of the on-off valve 12 is provided with a through hole 17 that communicates the inside of the air chamber 5 with the atmosphere, and the inner wall opening of the through hole 17 of the air chamber 5 is closed by a lid 18. Lid
The spring 18 is pushed by the spring 19 in a direction to close the through hole 17, and when the valve body 12a rises, the spring 18 is engaged with the lid body 18 and integrally rises, and the upward movement opens the through hole 17. ing.

[Advantages of the Invention] In the lift hydromount of the present invention, the support shaft connected to the supported body is connected to the rolling diaphragm under hydraulic pressure. Therefore, the rolling diaphragm is not affected by the load or shock acting on the support shaft. It is easily deformed in accordance with the hydraulic pressure for holding, and is less likely to be damaged and has durability as compared with the conventional type in which a thick elastic body is deformed. Further, since the rolling diaphragm does not extend, it itself cannot elastically deform to absorb a sudden shock or vibration, but the elastic plate in the liquid chamber elastically deforms to absorb a sudden shock or vibration.

Also, the support shaft is designed so that air pressure is applied to the liquid chamber to adjust and maintain it at a predetermined height, so that it is possible to support it with a small natural frequency and a comfortable ride, and at the same time, with sufficient damping force to reduce impact and shock. Vibration can be buffered.

Furthermore, when the valve body of the on-off valve provided in the air chamber moves up and down,
Since the guide rod is guided through the guide hole of the partition wall, the opening / closing operation of the opening / closing valve is reliable and the breakage is less likely to occur.

[Brief description of the drawings]

The drawings are cross-sectional views of the lift hydromount of the present invention. 2; rolling diaphragm, 3; diaphragm plate 4; liquid chamber, 5; air chamber 6; support shaft, 8; elastic plate 12; open / close valve, 16; guide rod 17; through hole

Claims (2)

(57) [Claims] Claim: What is claimed is: 1. A rolling diaphragm and a diaphragm board are mounted in a case having an opening at an upper end thereof with a space therebetween to form a liquid chamber between the rolling diaphragm and the diaphragm board, and between the diaphragm board and the case bottom wall. An air chamber is formed in the, and a support shaft is attached to the rolling diaphragm via a support plate, the upper end of which is projected from the case opening, and the liquid chamber is vertically divided into two parts by an elastic plate having a throttle passage to open and close the air chamber. A lift hydromount that communicates with the pressure source via the valve body and connects the valve body of the on-off valve to the diaphragm board via the connecting rod, and provides a through hole that communicates the air chamber with the atmosphere so that it opens when the valve body rises. . 2. The lift hydromount according to claim 1, wherein a guide rod is provided so as to protrude from the center of the upper surface of the diaphragm plate, and the guide rod is inserted into a guide hole provided in the elastic plate.