JP3533509B2 - Liquid-filled mount - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine such as a power shovel, which is provided between a vehicle body directly receiving vibration and a vibration protector such as a cab. The present invention relates to a vibration-proof liquid-filled mount that protects a liquid crystal panel from vibration. 2. Description of the Related Art At present, cabs and the like of construction machines are required to have a comfortable livability and operability as well as a soft and round design that is gentle to people. In addition, in order to improve the vibration received by the vibration protection unit such as the cab due to the increase in the traveling speed of the construction machine, a liquid-filled mount having higher performance than a rubber mount is required. FIG. 9 is a schematic sectional view showing a conventional liquid-filled mount. In the figure, reference numeral 1 denotes a case, and the case 1 includes a cylindrical portion 1A, a cup portion 1B, an upper flange portion 1C, and a lower flange portion 1D, and an upper flange portion 1C is provided at an upper end portion of the cylindrical portion 1A. The lower flange 1D is attached to the lower end of the cylindrical portion 1A by welding or the like. A bending claw 1E is provided at the upper end of the cup portion 1B, and the bending claw 1E of the cup portion 1B is swaged so as to enclose the lower end portion of the cylindrical portion 1A and the flange portion 1D. And caulked by such means. In addition, an injection hole 1F for injecting the following highly viscous liquid is provided at the bottom of the cup portion 1B. 2
Is a tubular elastic body, and this tubular elastic body 2 is made of an elastic body such as rubber, and has a protruding portion 2A formed radially at the upper end thereof and a through hole 2B provided at the center thereof. Have been. Reference numeral 3 denotes a stud. The stud 3 has a threaded hole 3A at the upper end and a threaded groove (not shown) at the lower end.
Is cut off. [0004] Reference numeral 4 denotes an attenuation plate, which is formed in a disk shape and has a mounting hole 4A and a plurality of holes 4B. The hole 4B is for moving the air that has entered from the injection hole 1F during the assembly to the upper air layer. Reference numeral 5 denotes a nut. The nut 5 is screwed into a thread groove (not shown) cut at the lower end of the stud 3 to fix the damping plate 4 to the lower end of the stud 3. Reference numeral 6 denotes a high-viscosity liquid, and the high-viscosity liquid 6 is sealed in the cup 1B of the case 1. Reference numeral 7 denotes a stopper, which is fitted into the injection hole 1F of the cup portion 1B of the case 1. Reference numeral 8 denotes a stopper. The stopper 8 is formed of an elastic body such as rubber.
Is adhesively fixed to the upper surface of the outer peripheral portion. 9 is a cushioning member,
The cushioning member 9 is made of an elastic body such as a sponge formed in a ring shape, and is adhered and fixed to the lower surface of the outer peripheral portion of the attenuation plate 4. A bolt (not shown) attached to a cab (not shown) has a screw hole 3 cut at the upper end of the stud 3.
The cab (not shown) is fixed by being screwed into A. Next, the assembling operation of the liquid-filled mount having the above configuration will be described. First, the stud 3 is inserted into the through hole 2B of the tubular elastic body 2, and the stud 3 is fixed in the through hole 2B of the tubular elastic body 2 by baking adhesion. Further, a stopper 8 is adhered and fixed to the upper surface of the outer peripheral portion of the damping plate 4, and
The buffer member 9 is bonded and fixed to the lower surface of the outer peripheral portion of the attenuation plate 4. At the lower end of the stud 3, a mounting hole 4A for the damping plate 4 is provided.
Is inserted, and the nut 5 is screwed into the thread groove 3B of the stud 3, and the attenuation plate 4 is fixed to the lower end of the stud 3. Then, the tubular elastic body 2 (to which the stud 3, the attenuation plate 4, the stopper 8, and the buffer member 9 are attached) is inserted into the tubular portion 1A of the case 1, and is fixed at a predetermined position by baking adhesion. Then, the lower end portion of the cylindrical portion 1A of the case 1 and the flange portion 1D are bent and fixed together by means such as caulking so that the folding claw 1E of the cup portion 1B of the case 1 is wrapped. Then, the high-viscosity liquid 6 is injected from an injection hole 1F provided at the bottom of the cup portion 1B of the case 1, and the stopper 7 is fitted into the injection hole 1F. Next, the buffering operation of the liquid-filled mount having the above-described configuration will be described. First, construction equipment (not shown)
, Vibration is applied to a vehicle body (not shown), and the vibration is transmitted to the case 1. In the case of high-frequency minute vibration, when the case 1 vibrates, the buffer member 9 adhered and fixed to the lower surface of the outer peripheral portion of the damping plate 4 is deformed before the high-viscosity liquid 6 is stirred by the damping plate 4 and the vibration is caused. Attenuate. Also,
When a large vibration having a low frequency is applied, the case 1 vibrates, and the high viscous liquid 6 is stirred by the damping plate 4. At this time, since a damping action acts on the damping plate 4 due to the viscous resistance of the high-viscosity liquid 6, the stud 3 becomes damped vibration, and the vibration transmitted to the cab (not shown) can be reduced. Note that the load of the cab (not shown) can be received by the cylindrical elastic body 2. However, in the conventional liquid-filled mount, since the damping plate stirs the high-viscosity liquid due to the vibration of the case 1, the buffer member is damaged by the liquid pressure of the high-viscosity liquid. There was a problem that it was easy and durability was poor. In the case of a liquid-filled mount in which the cushioning member is not adhered and fixed to the lower surface of the outer peripheral portion of the damping plate, in the case of minute vibration, the dynamic spring constant increases due to the large hydraulic pressure applied to the damping plate, and the minute vibration is reduced. It cannot be absorbed sufficiently. [0008] A liquid-filled mount according to the present invention accommodates a highly viscous liquid and directly receives a vibration from the outside, and has a vibration protection portion fixed at one end through a stud. A liquid comprising a stud to be fixed, a cylindrical elastic body having this stud fixed at the center, and a peripheral edge closely attached to the case, and a damping plate fixed to the other end of the stud and contained in the highly viscous liquid. In the enclosed mount, an attenuation plate including a disk-shaped attenuation portion and a holding portion formed on an outer peripheral portion of the disk-shaped attenuation portion, a dish-shaped disk having a through hole in a central portion, and the dish-shaped circle A pair of O-rings, which sandwich a support portion on the outer peripheral surface of the plate and are supported by a U-shaped holding portion of the damping plate, are provided. The present invention is provided between a vehicle body which receives direct vibrations such as construction machinery and a vibration protection portion such as a cab, and absorbs vibrations from high frequency minute vibrations to low frequency vibrations to protect the vibrations. The part can be isolated. FIG. 1 is a sectional view showing an embodiment of a liquid-filled mount according to the present invention. In the drawing, reference numeral 10 denotes a case, and as shown in a schematic perspective view of FIG. 2, the case 10 is composed of a cup portion 10A and a mounting plate 10B. Further, the mounting plate 10B has a mounting hole 10C and a fixing claw. 10D. Reference numeral 11 denotes a stud. The stud 11 has a through hole 11A at the center thereof for injecting the highly viscous liquid 6, and a thread groove 11B at an upper end of the through hole 11A. A hole 11C is provided, and a caulking claw 11D is formed at the other end. Reference numeral 12 denotes a detent pin. One end of the detent pin 12 is fitted into and fixed to the detent pin hole 11C of the stud 11. Reference numeral 13 denotes a cylindrical member.
As shown in FIG. 3 (A) and FIG. 3 (B), a detailed perspective view thereof includes a cylindrical portion 13A and a mounting plate 13C having a mounting hole 13B. Reference numeral 14 denotes a cylindrical elastic body. The cylindrical elastic body 14 is provided with a through hole 14A at a central portion, and is formed by positioning the cylindrical member 13 and then press-fitting rubber so as to surround the cylindrical member 13. I do. Fifteen
4A shows a detailed plan view of the attenuation plate 15, and FIG. 4B shows a sectional view taken along line A1-A2 of FIG.
As shown in the figure, the disk-shaped attenuation portion 15A and the disk-shaped attenuation portion 1
It comprises a holding portion 15B integrally formed on the outer peripheral surface of 5A. The disc-shaped damping portion 15A has a mounting hole 15C and a damping hole 15D at the center thereof, and the holding portion 15B has therein a movable plate described below and two O-rings for holding the movable plate. After being inserted, it is crimped to form a cross section in a U-shape (see FIG. 1). Reference numeral 16 denotes a movable plate. The movable plate 16 has a detailed plan view shown in FIG. 5A, and a sectional disk B1-B2 shown in FIG. A through hole 16A is provided at the center of the hole, and a support portion 16B is provided on the outer peripheral surface. This through hole 16A is made of a highly viscous liquid 6
For injecting. 17A and 17B are O
O-rings 17A and 17B are made of an elastic material such as rubber.
The supporting portion 16B of the movable plate 16 is inserted between the movable member 16 and the supporting member 16B. 18
Is a stud, the stud 18 has a thread groove 18A cut at one end, a nut (not shown) is screwed into the thread groove 18A, and a cab (not shown) is fixed. The thread groove 18B is cut, and the thread groove 18B is screwed into the thread groove 11B of the stud 11 and fixed. Reference numeral 19 denotes a one-shaped plug. The one-shaped plug 19 can be held in the through hole 11A of the stud 11 to enhance sealing performance. Next, the assembling operation of the liquid-filled mount having the above configuration will be described. First, the stud 11 and the cylindrical member 13 are set in a jig (not shown), an elastic body such as rubber is press-fitted, and the cylindrical elastic body 14 is formed so as to wrap the cylindrical member 13 and then vulcanized and bonded. The stud 11, the cylindrical member 11, and the cylindrical elastic body 14 are integrally fixed. Then, as shown in FIG. 6, after inserting the mounting hole 15C of the attenuation plate 15 into the other end of the stud 11, the stud 11
The caulking claw 11D is caulked to fix the damping plate 15. Then, as shown in FIG. 7, the O-ring 17A, the movable plate 16, and the O-ring 17 are provided in the holding portion 15B of the attenuation plate 15.
After providing in the order of B, the holding section 16B is swaged to form a U-shaped cross section. Then, as shown in FIG.
1. An integrated member obtained by integrating the cylindrical member 13, the cylindrical elastic body 14, the damping plate 15, the movable plate 16, and the O-rings 17A and 17B is inserted into the cup 10A of the case 10, and the cylindrical elastic body 14 The tapered outer side surface is in close contact with the inner side surface of the cup portion 10A. And the fixing claw 10 of the case 10
This integrated member can be fixed to the case 10 by bending D so as to wrap the end surface of the mounting plate 13C of the tubular member 13. At this time, the upper end of the tapered outer side surface of the cylindrical elastic body 14 is sandwiched between the curved bent portion of the cylindrical member 13 and the curved bent portion of the case 10 to be compressed and adhered. Can be. Then, the highly viscous liquid 6 is injected from a through hole 11A provided at the center of the stud 11. Then, after holding the one-shaped plug 19 in the through hole 11A, the thread groove of the stud 11 is screwed into the thread groove 11B of the stud 11, and the high viscous liquid 6 can be sealed in the cup portion 10A of the case 10. . Next, the buffering operation of the liquid-filled mount having the above-described configuration will be described. First, construction equipment (not shown)
, A high-frequency minute vibration is applied to a vehicle body (not shown), and the minute vibration is transmitted to the case 1. When the case 1 is slightly vibrated, since the movable plate 16 has an arc-shaped cross section, the contact area with the high-viscosity liquid 6 is widened, and the liquid pressure of the high-viscosity liquid 6 can be received in a wide area. So
The movable plate 16 forcibly compresses the O-rings 17A and 17B, which are elastic bodies, and the elastic return (expansion) of the O-rings 17A and 17B causes the movable plate 16 to vibrate and stir the viscous liquid 6. And the highly viscous liquid 6
5 through the damping hole 15D, it is possible to reduce the hydraulic pressure and absorb the minute vibration. When a large vibration is applied to a vehicle body (not shown) at a low frequency, the large vibration is transmitted to the case 1. When the case 1 vibrates greatly, the damping plate 15 vibrates, and the movable plate 16 supported by the O-rings 17A and 17B also stirs the highly viscous liquid 6 together with the damping plate 15. The contact area of the high-viscosity liquid 6 is widened by the damping plate 15 and the movable plate 16, the liquid pressure of the high-viscosity liquid 6 can be received in a wide area, and a large vibration corresponding to the shear resistance of the high-viscosity liquid 6 is ensured. Can be absorbed. As described above in detail, according to the liquid-filled mount according to the present invention, the liquid-mount mount is provided between a vehicle body that directly receives vibration from a construction machine or the like and a vibration protection section such as a cab. Since it is possible to reliably absorb a minute vibration of a high frequency to a large vibration of a low frequency, there is an effect that the vibration protection unit can be prevented from vibration.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an embodiment of a liquid-filled mount according to the present invention. FIG. 2 is a schematic perspective view showing the case of FIG. FIG. 3 is a schematic perspective view showing the tubular member of FIG. FIG. 4 is a plan view showing the attenuation plate of FIG. 1 and its A1-A.
FIG. FIG. 5 is a plan view showing the movable plate of FIG. 1 and B1-B thereof.
FIG. FIG. 6 is a partially detailed sectional view showing a fixed state between the stud and the damping plate in FIG. 1; FIG. 7 is a cross-sectional view for explaining a method for attaching a movable plate and an O-ring to a holding portion of the damping plate of FIG. FIG. 8 is a cross-sectional view for explaining the assembling operation of FIG. FIG. 9 is a cross-sectional view showing a conventional liquid-filled mount. [Description of Signs] 10 Case 11 Stud 13 Cylindrical member 14 Cylindrical elastic body 15 Damping plate 16 Movable plate 17A O-ring 17B O-ring 18 Stud bolt 19 One-piece plug

Claims (1)

(57) [Claims 1] A case for storing a high-viscosity liquid and directly receiving vibration from the outside, a stud having one end fixed to a vibration protection portion via a stud, and In a liquid-filled mount composed of a cylindrical elastic body with a stud fixed and a peripheral edge in close contact with the case, and an attenuating plate fixed to the other end of the stud and contained in the high-viscosity liquid, A damping plate comprising a damping portion and a holding portion formed on the outer periphery of the disc-shaped damping portion; a dish-shaped disc having a through hole in the center portion; and a pair of holding plates for supporting the disc-shaped disc. And a holding portion for the damping plate, wherein the holding portion of the dish-shaped disk holds the pair of O-rings in a state of being sandwiched therebetween.