JP5188147B2 - Vibration isolator - Google Patents

Description

  The present invention relates to a vibration isolator used for an engine mount of a construction machine such as a hydraulic excavator.

  Conventionally, as a vibration isolator used for an engine mount of a construction machine such as a hydraulic excavator, for example, in Patent Documents 1 to 3, rubber is provided between a metal inner cylinder and a metal flanged outer cylinder. The elastic body is formed by vulcanization and bonding so as to expose the upper end surface and the outer peripheral portion thereof, and is sandwiched between the outer periphery on the lower end side of the inner cylindrical body and the inner periphery on the lower end side of the outer cylindrical body There is disclosed a groove in which a concave groove that enters a relatively shallow upper part is formed in an annular shape so as to follow the outer periphery of the inner cylindrical body at the lower end surface of the elastic body.

  This vibration isolator is used in a pair of upper and lower sides, and is fitted in a mounting hole provided in the engine side bracket with the inner cylinders and the bosses of the outer cylinders facing each other. And, a fastening bolt is inserted into the main body frame side bracket of the construction machine disposed on the upper part of the upper vibration isolator and the inner cylinders of the upper and lower vibration isolators, and the head of the fastening bolt is connected to the main body frame side. A fastening nut is fastened via a receiving bracket to a lower end portion that is brought into contact with the upper surface of the bracket and projects downward from the inner cylinder of the vibration isolator on the lower side of the fastening bolt. Thus, the engine is mounted after the inner cylinders are brought into contact with each other to give a pre-compression amount to the rubber elastic body.

FIG. 4 is a schematic diagram showing a state in which the engine side bracket is held by a vibration isolator. As shown in FIG. 4, a metal stopper 41 protrudes toward the main body frame 43 on the surface of the engine 40 facing the main body frame 43 of the vehicle body (the lower surface of the engine 40 in FIG. 4). The metal stopper 41 is in contact with the main body frame 43 when the engine 40 supported by the vibration isolating devices 10 and 10 rotates about the center of gravity position 42 so that the engine 40 does not rotate any more. The engine 40 is prevented from being greatly displaced. Thereby, various members arranged in the peripheral region of the engine 40 and the engine 40 are prevented from interfering with each other.
Japanese Utility Model Publication No. 54-28815 Japanese Utility Model Publication No. 63-37538 Japanese Utility Model Publication No. 3-28199

  However, the conventional vibration isolator is configured to receive and absorb all the kinetic energy when the engine vibrates when the construction machine bounces, etc., with a metal stopper. The load acting on the made stopper and the main body frame is increased, and there is a possibility that the contact portion is damaged or a loud collision sound is generated.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a vibration isolation device that can absorb a part of the kinetic energy at the time of vibration generation before the metal stopper acts to reduce the impact acceleration. To provide an apparatus.

  In order to achieve the above-described object, the present invention forms a standing portion and a horizontal portion on the flange portion of the outer cylindrical body, and provides a rubber stopper portion on the surface of the horizontal portion to absorb a part of the kinetic energy. I did it.

  Specifically, the present invention includes an outer cylindrical body that is formed in a cylindrical shape and has a flange portion that projects in the outer peripheral direction at one end in the cylindrical axis direction, and is formed in a cylindrical shape and concentric with the outer cylindrical body. And is provided between the outer cylinder and the inner cylinder, and an inner cylinder whose one end in the cylinder axis direction protrudes outward in the cylinder axis direction from the flange portion of the outer cylinder. The following solution was taken for a vibration isolator provided with a rubber elastic body for connecting the two.

That is, in the invention of claim 1, a standing portion standing in the protruding direction of the inner cylindrical body is integrally formed on the outer peripheral edge of the flange portion over the entire circumference.
A horizontal portion projecting in the outer peripheral direction of the outer cylindrical body is integrally formed at the distal end peripheral portion of the standing portion,
On the protruding side surface of the inner cylindrical body in the horizontal portion, a rubber stopper portion is provided in which the top surface in the thickness direction is set at a position lower than the protruding side end surface of the inner cylindrical body,
The rubber stopper portion is provided so as to cover the entire surface of the standing portion and the horizontal portion.

According to the first aspect of the present invention, since the standing portion and the horizontal portion are integrally provided on the flange portion of the outer cylindrical body, and the rubber stopper portion is provided on the protruding side surface of the inner cylindrical body in the horizontal portion, the engine vibrates. Sometimes, the rubber stopper part and the main body frame side bracket are brought into contact with each other, and a part of the kinetic energy at the time of vibration generation can be absorbed by the rubber stopper part. That is, if the metal stopper provided on the engine side abuts against the vehicle body frame and the displacement of the engine is restricted, a part of the kinetic energy is absorbed by the rubber stopper portion in advance. The impact acceleration when the stopper acts can be reduced, which is advantageous in preventing breakage and wear of the contact portion between the metal stopper and the main body frame and reducing collision noise.

  Furthermore, instead of directly providing the rubber stopper portion on the surface of the flange portion, a horizontal portion is provided to stand upright from the outer peripheral edge portion of the flange portion and project from the peripheral edge portion of the flange portion in the outer peripheral direction. Since the rubber stopper portion is provided on the projecting side surface of the inner cylindrical body, it is advantageous in improving the spring characteristics of the rubber stopper portion.

  That is, when the rubber stopper part is directly provided on the surface of the flange part, the distance between the main body frame side bracket and the rubber stopper part is large, so the rubber thickness of the rubber stopper part is increased to bring them into contact with each other. Must. However, if the rubber thickness of the rubber stopper is thick, the elasticity will increase, so the metal stopper will act before absorbing the kinetic energy at the time of vibration generation enough to reduce the impact acceleration sufficiently. There is a concern that the rubber stopper may have poor durability performance. Therefore, as in the case of the vibration isolator of the present invention, if a standing portion and a horizontal portion are provided with respect to the flange portion so as to keep the thickness of the rubber stopper portion to a minimum thickness, the movement at the time of vibration occurrence After sufficiently absorbing energy, the engine-side metal stopper can be activated.

  Moreover, since the whole surface of the standing part and the horizontal part of the flange part is covered with the rubber stopper part, the rubber stopper part can be used as a coating material for rust prevention of the standing part and the horizontal part. That is, when forming a standing part and a horizontal part by press-molding a metal flange part, it is necessary to perform a coating treatment for rust prevention on the standing part and the horizontal part. When the rubber stopper is vulcanized and bonded to the projecting side surface of the inner cylinder in the horizontal part as in the case of the vibration isolator, the rubber stopper is also vulcanized and bonded to the entire surface of the standing part and the horizontal part. By doing so, the coating process for rust prevention can be omitted, and the work efficiency is improved as a whole.

  As described above, according to the present invention, the standing portion and the horizontal portion are provided on the flange portion of the outer cylindrical body, and the rubber stopper portion is provided on the protruding side surface of the inner cylindrical body in the horizontal portion. The rubber stopper portion and the main body frame side bracket can be brought into contact with each other so that a part of the kinetic energy at the time of vibration generation can be absorbed by the rubber stopper portion. That is, if the metal stopper provided on the engine side abuts against the vehicle body frame and the displacement of the engine is restricted, a part of the kinetic energy is absorbed by the rubber stopper portion in advance. The impact acceleration when the stopper acts can be reduced, which is advantageous in preventing breakage and wear of the contact portion between the metal stopper and the main body frame and reducing collision noise.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature and is not intended to limit the present invention, its application, or its use.

  FIG. 1 is a side sectional view showing a configuration of a vibration isolator according to an embodiment of the present invention. As shown in FIG. 1, the vibration isolator 10 includes an outer cylinder 11, an inner cylinder 15 disposed concentrically in the outer cylinder 11, and an outer cylinder 11 and an inner cylinder 15. The rubber elastic body 20 which connects both provided is provided.

  A flange portion 12 that protrudes in the outer peripheral direction is provided at one end portion (upper side in FIG. 1) of the outer cylindrical body 11 in the tube axis direction. The cross-sectional shape of the flange portion 12 is a shape having a curved portion 12a curved upward at the base end portion and a horizontal surface portion 12b extending horizontally from the outer peripheral edge portion of the curved portion 12a in the outer peripheral direction. ing. The flange portion 12 may be formed with the horizontal surface portion 12b from the base end portion without providing the curved portion 12a.

  And the standing part 13 standing up in FIG. 1 is formed in the outer peripheral edge part of the horizontal surface part 12b of the flange part 12 over the perimeter. Further, a horizontal portion 14 is formed at the peripheral edge of the tip of the standing portion 13 so as to project in the outer peripheral direction of the outer cylinder 11. In addition, the flange part 12, the standing part 13, and the horizontal part 14 are integrally formed by press-molding and bending the outer cylindrical body 11.

  The inner cylindrical body 15 is disposed concentrically in the outer cylindrical body 11, and the upper end portion projects upward from the flange portion 12 (more precisely, the horizontal portion 14) of the outer cylindrical body 11.

  The rubber elastic body 20 is provided between the outer cylinder body 11 and the inner cylinder body 15, and is configured by being vulcanized and bonded integrally so as to expose the upper end portion 20a and the outer peripheral portion 20b. The outer peripheral portion 20b of the rubber elastic body 20 is formed in a tapered shape that becomes narrower from the lower end portion covering the upper surface of the flange portion 12 to the upper end portion 20a.

  A concave groove that is deeply penetrated into the entire upper portion on the lower end surface of the rubber elastic body 20 sandwiched between the outer periphery on the lower end side of the inner cylinder 15 and the inner periphery on the lower end side of the outer cylinder 11. 20 c is formed in an annular shape so as to follow the outer periphery of the inner cylindrical body 15.

  On the upper surface of the horizontal portion 14 of the outer cylindrical body 11, a rubber stopper portion 16 is formed in an annular shape over the entire circumference. The rubber stopper portion 16 is formed integrally with the rubber elastic body 20 by vulcanization adhesion, and the top surface (the upper surface in FIG. 1) in the thickness direction is lower than the upper end surface of the inner cylinder 15. Set to position. Further, the rubber stopper portion 16 is integrally formed so as to cover the outer peripheral surface of the standing portion 13 and the lower surface of the horizontal portion 14.

  Thus, if the entire surface of the standing portion 13 and the horizontal portion 14 of the flange portion 12 is covered with the rubber stopper portion 16, the rubber stopper portion is used as a rust-preventing coating material for the standing portion 13 and the horizontal portion 14. 16 can be used. That is, when the metal flange portion 12 is press-formed to form the standing portion 13 and the horizontal portion 14, it is necessary to apply a coating treatment for rust prevention to the standing portion 13 and the horizontal portion 14. However, when the rubber stopper portion 16 is vulcanized and bonded to the upper surface of the horizontal portion 14 as in the vibration isolator 10 of the present invention, the rubber stopper portion 16 is also applied to the entire surfaces of the standing portion 13 and the horizontal portion 14 together. If vulcanized and bonded, the coating process for rust prevention can be omitted, and the work efficiency is improved as a whole.

  FIG. 2 is a side sectional view showing a use state of the vibration isolator according to the present embodiment. As shown in FIG. 2, a pair of upper and lower vibration damping devices 10, 10 are attached to the mounting holes 51 provided in the engine-side bracket 50, the inner cylindrical bodies 15, 15 and the outer cylindrical bodies 11, 11. 11a is fitted so that each may oppose. Then, the fastening bolts 53 are inserted into the main body frame side bracket 52 of the construction machine arranged at the lower part of the lower vibration isolator 10 and the inner cylinders 15 and 15 of the upper and lower vibration isolators 10 and 10 and fastened. A fastening nut 55 is fastened to an upper end portion of the bolt 53 protruding above the inner cylinder 15 of the upper vibration isolator 10 via a main body frame side bracket 54. Thus, the engine (not shown) is mounted after the inner cylinders 15 and 15 are brought into contact with each other and the vibration isolators 10 and 10 are set in a pre-compressed state.

  Here, when a large load is applied and vibration is generated, the rubber stopper portion 16 and the main body frame side bracket 52 come into contact with each other, and a part of the kinetic energy at the time of vibration generation is absorbed by the rubber stopper portion 16. That is, as shown in FIG. 4, before the metal stopper 41 provided on the engine 40 side abuts against the vehicle body frame 43 and the displacement of the engine 40 is restricted, the kinetic energy of the rubber stopper 16 is preliminarily controlled. If a part of the metal stopper 41 is absorbed, the impact acceleration when the metal stopper 41 acts can be reduced, and the contact portion between the metal stopper 41 and the main body frame 43 can be prevented from being damaged or worn. This is advantageous in reducing sound.

  Further, the rubber stopper portion 16 is not directly provided on the surface of the flange portion 12, but the standing portion 13 is erected from the outer peripheral edge portion of the flange portion 12, and the horizontal portion 14 is projected from the distal end peripheral portion in the outer peripheral direction. Since the rubber stopper portion 16 is provided on the upper surface of the horizontal portion 14, it is advantageous in improving the spring characteristics of the rubber stopper portion 16.

  That is, when the rubber stopper portion 16 is directly provided on the surface of the flange portion 12, since the distance between the main body frame side bracket 52 and the rubber stopper portion 16 is large, the rubber stopper portion is used to bring them into contact with each other. The rubber thickness of 16 must be increased. However, if the rubber thickness of the rubber stopper portion 16 is increased, the elasticity is increased. Therefore, before the kinetic energy is sufficiently absorbed when the vibration is generated, the metal stopper 41 acts to sufficiently reduce the impact acceleration. There are concerns about problems such as failure to perform and poor durability. Therefore, as in the vibration isolator 10 of the present invention, if the standing portion 13 and the horizontal portion 14 are provided with respect to the flange portion 12 to suppress the rubber thickness of the rubber stopper portion 16 to a minimum thickness, The kinetic energy at the time of vibration generation can be absorbed sufficiently.

  FIG. 3 is a graph showing the relationship between the load and displacement of the vibration isolator according to the present embodiment and the conventional vibration isolator. In FIG. 3, a solid line 31 represents the vibration isolator of the present invention, and a two-dot chain line 32 represents the spring characteristics of the conventional vibration isolator. Reference numeral 35 denotes an operation start position of the rubber stopper portion 16, and reference numeral 36 denotes an operation start position of the metal stopper 41.

  As shown in FIG. 3, in the vibration isolator 10 of the present invention, when vibration is generated, the rubber stopper portion 16 is first brought into contact with the main body frame side bracket 52 and elastically deformed. 41 is in contact with the main body frame 43 so that the displacement of the engine is restricted. Therefore, in the section from the action start position 35 of the rubber stopper 16 to the action start position 36 of the metal stopper 41 in FIG. It can be seen that the kinetic energy corresponding to is absorbed by the rubber stopper 16 and the impact acceleration when the metal stopper 41 acts can be reduced.

  As described above, according to the vibration isolator 10 according to the present embodiment, the standing portion 13 and the horizontal portion 14 are provided on the flange portion 12 of the outer cylinder 11, and the rubber stopper portion 16 is provided on the upper surface of the horizontal portion 14. Therefore, after absorbing a part of the kinetic energy when the engine 40 vibrates with the rubber stopper 16, the metal stopper 41 provided on the engine 40 side is brought into contact with the main body frame 43 to obtain the remaining kinetic energy. It is possible to absorb the impact acceleration when the metal stopper 41 acts, and the rubber stopper portion 16 can reduce the impact acceleration in advance, and the impact noise can be reduced and the damage and wear of the parts can be greatly reduced. . In addition, since the standing portion 13 and the horizontal portion 14 are provided in the flange portion 12 so that the rubber thickness of the rubber stopper portion 16 is suppressed to a minimum thickness, the kinetic energy at the time of occurrence of vibration can be sufficiently absorbed. it can.

  As described above, the present invention can provide a vibration isolator that can absorb a part of the kinetic energy at the time of vibration generation before the metal stopper acts to reduce the impact acceleration. Since it is possible to obtain highly effective effects, it is extremely useful and has high industrial applicability.

It is side surface sectional drawing which shows the structure of the vibration isolator which concerns on embodiment of this invention. It is side surface sectional drawing which shows the use condition of a vibration isolator. It is a graph which shows the relationship between the load and displacement of the vibration isolator which concerns on this embodiment, and the conventional vibration isolator. It is a schematic diagram which shows the state which hold | maintained the engine side bracket with the vibration isolator.

DESCRIPTION OF SYMBOLS 10 Vibration isolator 11 Outer cylinder 12 Flange part 13 Standing part 14 Horizontal part 15 Inner cylinder 16 Rubber stopper part 20 Rubber elastic body

Claims (1)

An outer cylindrical body formed in a cylindrical shape and provided with a flange portion projecting in the outer peripheral direction at one end portion in the cylindrical axial direction, and formed in a cylindrical shape and arranged concentrically in the outer cylindrical body and in the cylindrical axial direction An inner cylinder in which one end of the outer cylinder protrudes outward in the cylinder axial direction from the flange portion of the outer cylinder, and a rubber elastic body provided between the outer cylinder and the inner cylinder to connect the two An anti-vibration device comprising:
On the outer peripheral edge portion of the flange portion, a standing portion erected in the protruding direction of the inner cylinder is integrally formed over the entire circumference,
A horizontal portion projecting in the outer peripheral direction of the outer cylindrical body is integrally formed at the distal end peripheral portion of the standing portion,
On the protruding side surface of the inner cylindrical body in the horizontal portion, a rubber stopper portion is provided in which the top surface in the thickness direction is set at a position lower than the protruding side end surface of the inner cylindrical body,
The rubber stopper portion is provided so as to cover the entire surface of the standing portion and the horizontal portion.

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