JP2012225464A - Vibration isolating mount - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration isolating mount suppressing abnormal noise caused by collision with an engine support bracket, with relatively simple structure.SOLUTION: An outer cylinder body 21 is fit into a mounting hole 8a of the engine support bracket 8. The outer cylinder body 21 has a cylindrical cylinder body part 22 and a flange part 23 radially expanded on one end side in an axial direction of the cylinder body part 22. A cylindrical inner cylinder body 25 is concentrically disposed in the outer cylinder body 21. The outer cylinder body 21 and the inner cylinder body 25 are connected by a rubber elastic body 30. A plurality of slits 22a are formed to the cylinder body part 22 of the outer cylinder body 21 at intervals in a circumferential direction.

Description

  The present invention relates to a vibration-proof mount.

  Conventionally, in a construction machine such as a hydraulic excavator, an anti-vibration mount is used to suppress vibration applied to the engine during the operation of the construction machine (see, for example, Patent Document 1). The vibration-proof mount has a vibration-proof rubber bush and a retainer portion that holds the rubber bush. The retainer portion of the vibration isolating mount is fitted into the mounting hole of the engine support bracket so that the engine support bracket and the vibration isolating mount are fixed integrally.

  Here, a slight gap is provided between the retainer portion of the vibration-proof mount and the mounting hole of the engine support bracket. For this reason, with the horizontal vibration applied to the engine during the operation of the construction machine, the retainer portion of the vibration isolating mount repeatedly collides with the peripheral portion of the mounting hole of the engine support bracket, and noise may be generated.

  Therefore, in Patent Document 1, the engine support bracket is provided on the contact portion between the upper surface of the engine support bracket and the retainer portion of the upper vibration-proof mount, and the contact portion between the lower surface of the engine support bracket and the retainer portion of the lower vibration-proof mount. A technique is disclosed in which a restricting means for restricting relative movement of the retainer portion in the direction along the upper surface and the lower surface of the bracket is provided. Specifically, the relative movement of the retainer portion is restricted by engaging protrusions provided on the vibration-proof mount and recesses provided on the upper and lower surfaces of the engine support bracket.

JP 2010-215086 A

  However, in the engine vibration-proof structure described in Patent Document 1, the retainer portion of the vibration-proof mount is provided with a protrusion and the engine support bracket is provided with depressions on the upper and lower surfaces. There was a problem that it was necessary to carry out with high precision and cost was increased.

  Further, in order to attach the vibration isolating mount having the protrusion to the retainer portion, it is necessary to provide a recess on the abutting surface of the engine support bracket. Therefore, the vibration isolating mount of Patent Document 1 should be applied to other construction machines. However, the engine support bracket has to be exchanged together with the vibration-proof mount, resulting in a problem that the number of work steps increases.

  The present invention has been made in view of this point, and an object of the present invention is to provide a vibration isolating mount that has a relatively simple configuration and suppresses the generation of noise due to a collision with an engine support bracket.

  The present invention is directed to an anti-vibration mount that is attached to an engine support bracket that supports an engine and suppresses vibrations of the engine, and has taken the following solutions.

That is, the first invention comprises an outer cylindrical body having a cylindrical cylindrical body portion that is fitted into the mounting hole of the engine support bracket,
A cylindrical inner cylinder disposed concentrically in the outer cylinder;
A rubber elastic body connecting the outer cylinder body and the inner cylinder body,
A plurality of slits are formed in the cylinder main body portion of the outer cylinder body at intervals in the circumferential direction.

  In the first invention, the outer cylinder is fitted into the mounting hole of the engine support bracket. The outer cylinder has a cylindrical cylinder body. A cylindrical inner cylinder is concentrically disposed in the outer cylinder. The outer cylinder and the inner cylinder are connected by a rubber elastic body. A plurality of slits are formed in the cylinder main body of the outer cylinder at intervals in the circumferential direction.

  With such a configuration, by using a precompression load applied to the rubber elastic body when assembling the vibration-proof mount, by deforming so that the outer diameter of the cylinder body portion of the outer cylinder body is increased, A gap with the mounting hole of the engine support bracket can be eliminated.

  Specifically, in order to insert the cylinder body portion of the outer cylinder body into the attachment hole of the engine support bracket, it is necessary to provide a slight gap between the cylinder body portion and the attachment hole. For this reason, along with the horizontal vibration applied to the engine during construction machine work, the cylinder main body of the outer cylinder repeatedly collides with the peripheral edge of the mounting hole of the engine support bracket, and noise may be generated. .

  On the other hand, in the present invention, since a plurality of slits are formed in the cylindrical body portion of the outer cylindrical body at intervals in the circumferential direction, a precompression load applied to the rubber elastic body when the vibration isolating mount is assembled. Thus, the slit of the tube main body can be enlarged and deformed so as to expand the tube main body in the radial direction. As a result, the gap between the cylinder body of the outer cylinder and the mounting hole of the engine support bracket can be eliminated, so that the cylinder body of the outer cylinder is attached to the engine support bracket along with the horizontal vibration of the engine. It is possible to suppress the generation of abnormal noise by repeatedly colliding with the peripheral edge of the hole.

  Further, since the generation of abnormal noise can be suppressed with a relatively simple configuration in which only a plurality of slits are formed in the cylinder main body portion of the outer cylinder body, the engine support bracket is recessed as in the invention of Patent Document 1. It is not necessary to perform special processing on the engine support bracket side, such as forming the shape, which is advantageous for cost reduction.

  Also, during pre-compression when mounting the anti-vibration mount, the rubber elastic body protrudes from the slit gap, and this protruding rubber elastic body also closes the gap with the mounting hole of the engine support bracket. This is advantageous in suppressing the generation of abnormal noise due to the collision with the bracket.

According to a second invention, in the first invention,
The cylindrical main body portion of the outer cylindrical body is divided into a plurality of portions in the circumferential direction by extending the slit in the entire axial direction.

  In the second invention, the slit extends in the entire axial direction. As a result, the cylinder body portion of the outer cylinder is divided into a plurality in the circumferential direction.

  With such a configuration, the divided cylinder main body portions are moved away from each other in the radial direction by the precompression load applied to the rubber elastic body when the vibration isolating mount is assembled, and the cylinder main body portion is moved in the radial direction. Can be expanded. As a result, the gap between the cylinder body of the outer cylinder and the mounting hole of the engine support bracket can be eliminated, so that the cylinder body of the outer cylinder is attached to the engine support bracket along with the horizontal vibration of the engine. It is possible to suppress the generation of abnormal noise by repeatedly colliding with the peripheral edge of the hole.

A third invention is directed to an anti-vibration mount that is attached to an engine support bracket that supports an engine and suppresses vibration of the engine.
An outer cylinder having a cylindrical tube main body portion to be fitted into the mounting hole of the engine support bracket, and a flange portion projecting in a radial direction on one axial end side of the cylinder main body portion;
A cylindrical inner cylinder disposed concentrically in the outer cylinder;
A rubber elastic body connecting the outer cylinder body and the inner cylinder body,
The cylinder main body portion and the flange portion are divided at the boundary position, and at least the flange portion is divided into a plurality in the circumferential direction.

  In the third invention, the outer cylinder is fitted into the mounting hole of the engine support bracket. The outer cylinder body has a cylindrical tube main body portion and a flange portion projecting radially on one end side in the axial direction of the tube main body portion. A cylindrical inner cylinder is concentrically disposed in the outer cylinder. The outer cylinder and the inner cylinder are connected by a rubber elastic body. The tube main body portion and the flange portion are divided at the boundary position. Further, at least the flange portion is divided into a plurality in the circumferential direction.

  With this configuration, the pre-compressed load applied to the rubber elastic body when the vibration-proof mount is assembled moves the divided flange portions away from each other in the radial direction, and the flat surface of the engine support bracket The contact area can be increased. Thereby, since the frictional force in the horizontal direction increases, it is possible to suppress the outer cylinder from moving relative to the engine support bracket in the horizontal direction along with the vibration in the horizontal direction of the engine.

  In addition, since the boundary position between the cylinder main body portion and the flange portion where the collision is easily repeated and the peripheral portion of the mounting hole of the engine support bracket is divided, it is advantageous in suppressing the generation of abnormal noise.

  In addition to dividing the flange portion, a plurality of slits may be formed in the cylindrical body portion of the outer cylindrical body at intervals in the circumferential direction, or the cylindrical body portion may be divided into a plurality of portions in the circumferential direction. Good. In this way, the pre-compressed load applied to the rubber elastic body when the vibration-proof mount is assembled is used to move the divided flange portions away from each other in the radial direction, and the cylinder of the outer cylinder body. By expanding the main body portion in the radial direction, it is possible to eliminate a gap with the mounting hole of the engine support bracket.

  According to the present invention, by using the precompression load applied to the rubber elastic body when the vibration-proof mount is assembled, the cylinder body portion of the outer cylinder body is expanded in the radial direction, and the mounting hole of the engine support bracket The gap can be eliminated. As a result, it is possible to suppress the occurrence of abnormal noise due to repeated collision of the cylinder body portion of the outer cylinder body with the peripheral edge portion of the mounting hole of the engine support bracket accompanying the vibration in the horizontal direction of the engine.

It is a side view which shows the structure of the construction machine which concerns on Embodiment 1 of this invention. It is a plane sectional view showing the composition of a construction machine. It is a side view which shows the structure of an anti-vibration mount. It is side surface sectional drawing which shows the structure of a vibration proof mount. It is side surface sectional drawing which shows the use condition of an anti-vibration mount. It is side surface sectional drawing which shows another structure of an anti-vibration mount. It is a top view which shows the structure of the outer cylinder body of the vibration isolating mount concerning this Embodiment 2. It is a top view which shows the structure of the outer cylinder body of the vibration isolating mount concerning this Embodiment 3. It is side surface sectional drawing which expands and shows a part of outer cylinder body before giving a precompression load to a rubber elastic body. It is side surface sectional drawing which expands and shows a part of outer cylinder after giving a precompression load. It is a top view which shows another structure of the outer cylinder body of an anti-vibration mount.

  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.

Embodiment 1
FIG. 1 is a side view showing a configuration of a construction machine according to Embodiment 1 of the present invention, and FIG. 2 is a plan sectional view. As shown in FIGS. 1 and 2, the construction machine 1 is a so-called hydraulic excavator, and performs excavation of earth and sand, crushed stone, and demolition of a building at a construction site where civil engineering work or construction work is performed. The construction machine 1 includes a lower traveling body 3 provided with a crawler 2 in which a large number of plate-like members are connected endlessly, and an upper revolving body 5 attached to the upper side of the lower traveling body 3 via a swiveling device 4. It has.

  A base 10 is provided at the lower part of the upper swing body 5. On the upper surface of the base 10, a pair of reinforcing ribs 18 extending in the front-rear direction of the apparatus are erected. A swing post 19 for connecting the attachment 11 is provided on the front side of the base 10 in the traveling direction.

  The attachment 11 includes a boom 12 attached to the base 10 so as to be tiltable in the vertical direction, an arm 13 attached to the tip of the boom 12 so as to be swingable, and a bucket 14 connected to the tip of the arm 13. It has.

  An operator cabin 15 is disposed next to the attachment position of the attachment 11 on the upper surface of the base 10. In the cabin 15, operating devices and air conditioners (not shown) for operating the attachment 11 are arranged.

  A machine room 16 is provided at the rear of the base 10. The engine 6 is disposed in the machine room 16 via a vibration-proof mount 20. The machine room 16 is covered with a cover 16a. A counterweight 17 is mounted behind the cover 16a.

  FIG. 3 is a side view showing the configuration of the vibration-proof mount, and FIG. 4 is a side sectional view. As shown in FIGS. 3 and 4, the anti-vibration mount 20 includes an outer cylindrical body 21, an inner cylindrical body 25 disposed concentrically within the outer cylindrical body 21, an outer cylindrical body 21, an inner cylindrical body 25, and the like. And a rubber elastic body 30 for connecting the two.

  The outer cylinder 21 includes a cylindrical tube main body portion 22 and a flange portion 23 that projects radially from one axial end side of the tube main body portion 22. A plurality of slits 22 a are formed in the cylinder body 22 at intervals in the circumferential direction.

  The inner cylinder 25 is disposed concentrically within the outer cylinder 21 and has an upper end protruding upward from the flange portion 23 of the outer cylinder 21.

  The rubber elastic body 30 is configured by being integrally vulcanized and bonded to the outer cylinder body 21 and the inner cylinder body 25. The outer peripheral portion of the rubber elastic body 30 is formed in a tapered shape that becomes narrower from the lower end portion covering the upper surface of the flange portion 23 to the upper end portion. A concave portion 30 a that is recessed upward is formed annularly along the inner circumferential direction of the outer cylindrical body 21 at a position near the inner cylindrical body 25 on the lower end surface of the rubber elastic body 30.

  FIG. 5 is a side cross-sectional view showing a usage state of the vibration-proof mount. As shown in FIG. 5, a support base 7 is erected on the base 10 of the upper swing body 5. An engine support bracket 8 that supports the engine 6 is installed on the support base 7 via an anti-vibration mount 20.

  The anti-vibration mounts 20 are arranged in a pair of upper and lower sides. Specifically, the cylinder main body portion 22 of the upper vibration-proof mount 20 is fitted into the mounting hole 8 a formed in the engine support bracket 8 from the upper side. The upper flange portion 23 is in contact with the upper surface of the engine support bracket 8. The lower vibration-proof mount 20 is fitted into the mounting hole 8a of the engine support bracket 8 from the lower side. The lower flange portion 23 is in contact with the lower surface of the engine support bracket 8. As a result, the engine support bracket 8 is held between the pair of upper and lower flange portions 23.

  The lower vibration isolating mount 20 is placed on the support base 7. A main body side bracket 9 of the construction machine 1 is arranged on the upper part of the upper vibration-proof mount 20. The fastening bolt 35 is inserted into the bolt hole 9 a of the main body side bracket 9, the inner cylinder 25 of the upper and lower vibration-proof mounts 20, and the bolt hole 7 a of the support base 7. A lower end portion of the fastening bolt 35 protrudes below the support base 7 and is fastened by a fastening nut 36. Thus, the engine 6 is mounted after the pair of upper and lower inner cylinders 25 are opposed to each other, the rubber elastic body 30 is elastically deformed, and the vibration-proof mount 20 is set in a precompressed state.

  Here, since a plurality of slits 22 a are formed in the cylinder main body portion 22 of the outer cylinder body 21 at intervals in the circumferential direction, it is preliminarily applied to the rubber elastic body 30 when the vibration isolating mount 20 is assembled. Due to the compressive load, the slit 22a of the tube main body portion 22 expands and the tube main body portion 22 is deformed so as to expand in the radial direction. As a result, the gap between the cylinder body 22 of the outer cylinder 21 and the mounting hole 8a of the engine support bracket 8 is closed. Moreover, the rubber elastic body 30 protrudes from the clearance gap of the slit 22a at the time of this precompression.

  With such a configuration, when a load is applied to the vibration isolating mount 20 due to the horizontal vibration applied to the engine 6 during the operation of the construction machine 1, the rubber elastic body 30 is elastically deformed to cause kinetic energy. Can be absorbed.

  Further, since the gap between the cylinder main body portion 22 of the outer cylinder body 21 and the mounting hole 8a of the engine support bracket 8 is eliminated, the cylinder main body portion 22 of the outer cylinder body 21 is moved along with the horizontal vibration of the engine 6. It is possible to suppress the generation of noise due to repeated collisions with the peripheral edge of the mounting hole 8a of the engine support bracket 8.

  Further, the rubber elastic body 30 protruding from the gap of the slit 22a also closes the gap between the mounting hole 8a of the engine support bracket 8 and suppresses the generation of noise due to the collision with the engine support bracket 8. It will be advantageous.

  The width of the slit 22a may be changed as appropriate in order to adjust the amount of protrusion of the rubber elastic body 30. For example, as shown in FIG. 6, the width of the slit 22 a may be increased to increase the amount of protrusion of the rubber elastic body 30.

<< Embodiment 2 >>
FIG. 7 is a plan view showing the configuration of the outer cylindrical body of the vibration-proof mount according to the second embodiment. Since the difference from the first embodiment is that the outer cylindrical body 21 is divided, the same parts as those of the first embodiment are denoted by the same reference numerals, and only the differences will be described below.

  As shown in FIG. 7, the outer cylindrical body 21 includes a cylindrical tube main body portion 22 and a flange portion 23 that projects radially from one end side in the axial direction of the tube main body portion 22. In the cylinder main body 22 and the flange 23, slits 22a and 23a extending in the entire axial direction are formed at two locations at intervals in the circumferential direction. As a result, the outer cylinder 21 is divided into two in the circumferential direction.

  With such a configuration, the divided outer cylinders 21 move away from each other in the radial direction due to the precompression load applied to the rubber elastic body 30 when the vibration isolating mount 20 is assembled. 21 can be expanded in the radial direction. As a result, the gap between the cylinder body 22 of the outer cylinder 21 and the mounting hole 8a of the engine support bracket 8 can be eliminated, so that the cylinder body of the outer cylinder 21 is accompanied by vibration in the horizontal direction of the engine 6. It is possible to suppress the occurrence of abnormal noise due to the collision of 22 with the peripheral edge portion of the mounting hole 8a of the engine support bracket 8.

<< Embodiment 3 >>
FIG. 8 is a plan view showing the configuration of the outer cylindrical body of the vibration-proof mount according to the third embodiment. Since the difference from the second embodiment is that the cylinder main body portion 22 and the flange portion 23 are divided at the boundary position, the same parts as those of the second embodiment are denoted by the same reference numerals, and the differences are the same. Only will be described.

  As shown in FIG. 8, the outer cylindrical body 21 includes a cylindrical tube main body portion 22 and a flange portion 23 that projects radially from one end side in the axial direction of the tube main body portion 22. In the cylinder main body 22 and the flange 23, slits 22a and 23a extending in the entire axial direction are formed at two locations at intervals in the circumferential direction. As a result, the outer cylinder 21 is divided into two in the circumferential direction.

  Further, an annular slit 21a is formed at the boundary position between the cylinder main body portion 22 and the flange portion 23 over the entire circumference in the circumferential direction. As a result, the tube main body portion 22 and the flange portion 23 are divided at the boundary position.

  FIG. 9 is a side cross-sectional view showing a partially enlarged outer cylinder before applying a precompression load to the rubber elastic body, and FIG. 10 is a partially enlarged view of the outer cylinder after applying the precompression load. FIG. As shown in FIG. 9, before the precompression load is applied to the rubber elastic body 30, the upper end edge of the cylinder main body portion 22 of the outer cylinder body 21 and the inner peripheral edge of the flange portion 23 are close to each other. .

  Then, as shown in FIG. 10, when the anti-vibration mount 20 is assembled and a pre-compression load is applied to the rubber elastic body 30, the cylinder body portion 22 and the flange portion 23 of the divided outer cylinder body 21 are separated from each other in the radial direction. To move. Thereby, the upper end edge of the cylinder main body 22 of the outer cylinder 21 and the inner peripheral edge of the flange 23 are separated.

  With such a configuration, the cylinder main body portions 22 of the divided outer cylinders 21 move away from each other in the radial direction by the precompression load applied to the rubber elastic body 30 when the vibration isolating mount 20 is assembled. And the cylinder main-body part 22 can be expanded to radial direction. As a result, the gap between the cylinder body 22 of the outer cylinder 21 and the mounting hole 8a of the engine support bracket 8 can be eliminated, so that the cylinder body of the outer cylinder 21 is accompanied by vibration in the horizontal direction of the engine 6. It is possible to suppress the occurrence of abnormal noise due to the collision of 22 with the peripheral edge portion of the mounting hole 8a of the engine support bracket 8.

  Further, the flange portion 23 of the divided outer cylindrical body 21 also moves away from each other in the radial direction due to the precompression load applied to the rubber elastic body 30, so that the flange portion 23 and the upper surface of the engine support bracket 8 are separated from each other. The frictional force can be increased by increasing the contact area.

  Specifically, a chamfered portion 8 b is formed on the inner peripheral edge of the mounting hole 8 a of the engine support bracket 8. Therefore, before applying the precompression load, the portion corresponding to the chamfered portion 8 b in the flange portion 23 is not in contact with the upper surface of the engine support bracket 8. When the precompression load is applied, the flange portions 23 move away from each other in the radial direction, and the portion of the flange portion 23 corresponding to the chamfered portion 8b comes into contact with the engine support bracket 8, and the precompression load is applied. The contact area can be increased compared to before application.

  Thereby, since the frictional force in the horizontal direction is increased, it is possible to suppress the outer cylinder body 21 from moving relative to the engine support bracket 8 in the horizontal direction along with the vibration in the horizontal direction of the engine 6.

  In addition, since the boundary position between the cylinder main body portion 22 and the flange portion 23 that is likely to repeatedly collide with the peripheral edge portion of the mounting hole 8a of the engine support bracket 8 is divided, it is advantageous in suppressing the generation of abnormal noise.

  In addition, although this embodiment demonstrated the form which divided the cylinder main-body part 22 of the outer cylinder 21 into the circumferential direction, as shown in FIG. 11, only the flange part 23 is divided | segmented and a cylinder main-body part 22 is cylindrical. It may be in the form of a shape. Moreover, the form which formed the some slit 22a at intervals in the circumferential direction at the cylinder main-body part 22 like Embodiment 1 may be sufficient.

  As described above, the present invention provides a highly practical effect that it is possible to provide an anti-vibration mount that has a relatively simple configuration and suppresses the generation of noise due to a collision with the engine support bracket. It is useful and has high industrial applicability.

6 Engine 8 Engine Support Bracket 8a Mounting Hole 20 Anti-Vibration Mount 21 Outer Cylindrical Body 22 Cylinder Body 22a Slit 23 Flange 25 Inner Cylinder 30 Rubber Elastic Body

Claims (3)

An anti-vibration mount that is attached to an engine support bracket that supports the engine and suppresses vibration of the engine,
An outer cylinder having a cylindrical tube main body portion to be fitted into the mounting hole of the engine support bracket;
A cylindrical inner cylinder disposed concentrically in the outer cylinder;
A rubber elastic body connecting the outer cylinder body and the inner cylinder body,
An anti-vibration mount characterized in that a plurality of slits are formed in the cylinder body portion of the outer cylinder body at intervals in the circumferential direction. In claim 1,
The tube body portion of the outer cylinder body is divided into a plurality of portions in the circumferential direction by extending the slit in the entire axial direction. An anti-vibration mount that is attached to an engine support bracket that supports the engine and suppresses vibration of the engine,
An outer cylinder having a cylindrical tube main body portion to be fitted into the mounting hole of the engine support bracket, and a flange portion projecting in a radial direction on one axial end side of the cylinder main body portion;
A cylindrical inner cylinder disposed concentrically in the outer cylinder;
A rubber elastic body connecting the outer cylinder body and the inner cylinder body,
The vibration-proof mount is characterized in that the tube main body portion and the flange portion are divided at a boundary position thereof, and at least the flange portion is divided into a plurality in the circumferential direction.

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