JP5177393B2 - Vibration isolator - Google Patents

Description

  The present invention relates to an anti-vibration device used for an agricultural machine such as a trucker, a construction machine such as a bulldozer, an engine mount of a vehicle or the like.

  As an anti-vibration device used for agricultural machines such as truckers, construction machines such as bulldozers, engine mounts for vehicles, etc., as shown in Patent Document 1, for example, an outer cylinder provided with a flange at the tip, A bracket attached to an engine that is a vibration generating portion between a pair of anti-vibration rubbers, in which an inner cylinder and a rubber elastic body interposed between the outer cylinder and the inner cylinder are integrated. A so-called sandwich type is widely used in which a pair of anti-vibration rubber is attached to a vehicle body side member serving as a vibration receiving portion, for example, a vehicle body frame with fixing bolts and nuts.

  FIG. 12A shows an example of a sandwich type vibration isolator provided with a pair of vibration isolator rubber as described above. In the vibration isolator 100, a bracket 112 coupled to a side portion 110a of an engine 110 by a mounting bolt 111 is disposed between a fixing plate 101 and a mounting plate 102 provided on a vehicle body frame (not shown), and a pair of vibration isolating rubbers. It is attached via 105.

  Each anti-vibration rubber 105 includes an outer cylinder 106 in which a flange 106b that extends in an annular shape is formed at the tip of the cylindrical portion 106a, an inner cylinder 107 accommodated in the outer cylinder 106, and a cylindrical portion 106a of the outer cylinder 106. A frustoconical rubber elastic body 108 interposed between the inner peripheral surface and the flange 106 b and the outer peripheral surface of the inner cylinder 107 is configured integrally, and the outer cylinder 106 and the inner cylinder 107 are interposed via the rubber elastic body 108. And elastically connected.

  On the other hand, the fixing plate 101 and the mounting plate 102 are respectively provided with bolt insertion holes 101a and 102a through which the fixing bolt 103 passes. The bracket 112 has a substantially L-shaped cross-section in which a mounting portion 112b is bent at the lower end of a base portion 112a attached to the side portion 110a of the engine 110 by a mounting bolt 111, and the mounting portion 112b has a cylindrical portion 106a of the outer cylinder 106. A mounting hole 112c into which can be inserted is drilled.

  Then, as shown in FIG. 12 (a), the base ends of the outer cylinders 106 of the anti-vibration rubbers 105 are opposed to each other so that the mounting holes 112c of the bracket 112 are fitted into the cylinder portions 106a and between the opposing flanges 106b. Pinch. Further, the fixing bolt 103 is inserted from the bolt insertion hole 102a of the mounting plate 102 so as to pass through the inner cylinder 107 of each anti-vibration rubber 105 and the bolt insertion hole 101a of the fixing plate 101, and the nut is provided at the tip via the washer 104a. 104 is screwed together. At this time, the fixing cylinders 103 and the nuts 104 are tightened until the inner cylinders 107 of the anti-vibration rubbers 105 come into contact with each other. As a result, each rubber elastic body 108 between the fixed plate 101 and the mounting plate 102 is compressed by a predetermined preliminary compression amount along the central axis Z direction, and is applied by the bracket 112 along the central axis Z direction. The required repulsive force can be generated with respect to the applied load.

  In the vibration isolator 100 attached to the vehicle body frame, a load due to the weight of the engine 110 is input as an offset load along the central axis Z direction via the bracket 112, and is interposed between the fixed plate 101 and the bracket 112. The engine 110 is mounted by the repulsive force of the rubber elastic body 108.

  On the other hand, when vibration along the central axis Z direction is input from the engine 110 side via the bracket 112 to the vibration isolator 100, the rubber elastic bodies 108 of the anti-vibration rubbers 105 are reversed along the central axis Z direction. It is elastically deformed in the direction, that is, the compression direction or the tensile direction, to attenuate and absorb the input vibration.

  On the other hand, in order to ensure the durability of each rubber elastic body 108 when the supporting load acting on the vibration isolator 100 increases with the increase in size of the engine or the like, the vibration isolating rubber 105 in FIG. With respect to the diameter of the rubber elastic body 108, as shown in FIG. 12B, the diameter of the rubber elastic body 108 of the anti-vibration rubber 105 is enlarged to set a high spring constant.

JP-A-8-326811

  However, in order to increase the spring constant of each frustoconical rubber elastic body 108 as the supporting load acting on the vibration isolator 100 increases, for example, the rubber elastic body 108 of the vibration isolating rubber 105 shown in FIG. 12b, the distance a between the center axis Z of the vibration isolator 100 and the base 112a of the bracket 112 attached to the side 110a of the engine 110 increases to the distance b (a <B)

  As the weight of the engine 110 increases and the distance from the base 112a of the bracket 112 to the central axis Z increases from a to b, the moment acting on the mounting bolt 111 increases, and the load on the mounting bolt 111 increases. As the load increases, deformation and damage of the mounting bolt 111 are induced, and the durability is lowered, and there is a concern that the support and the vibration isolation function of the vibration isolation device 100 may be affected.

  Accordingly, an object of the present invention made in view of such points is to provide a vibration isolator having excellent vibration isolating function and durability while reducing the load on the mounting bolt 111 that fastens the bracket and the vibration generating portion. .

The invention of an anti-vibration measure according to claim 1, which achieves the object, includes an outer cylinder in which a flange extending in an annular shape is formed at a tip of a cylinder portion, and an inner cylinder disposed in the outer cylinder. A pair of anti-vibration rubber having a rubber elastic body interposed between the flange and the outer peripheral surface of the inner cylinder; a base end coupled to the engine by a mounting bolt; and a mounting portion extending to the base end. A bracket in which a mounting hole for inserting the cylindrical portion is formed in a portion, a fixing plate provided in a vehicle body frame and formed with a bolt insertion hole, and a mounting plate provided with a bolt insertion hole, the pair of rubber elastic body is opposed to the proximal end of another of the inner tube, and while being connected to the bracket by sandwiching the mounting portion between the pair of flanges, axially outwardly of the pair of rubber elastic body Each of the fixing plate and mounting plate Together sandwiching the pair of the rubber elastic body between the fixed plate and the mounting plate by inserting hole and fixing bolts and nuts screwed into the fixing bolt inserted through the pair of the inner cylinder, the fixing bolts extend An anti-vibration device in which an offset load along the central axis direction is input from the engine to each anti-vibration rubber through the bracket, and the rubber elastic body has a short axis direction in contact with and away from the engine. A major axis direction having a diameter and a major axis direction orthogonal to the minor axis direction is provided as a major axis, and the major axis direction is parallel to a crankshaft extending direction of the engine .

According to the present invention, when an offset vibration load along the central axis direction is input from the engine via the bracket mounting portion, the rubber elastic body of each vibration isolating rubber is between the bracket and the fixing plate and between the bracket and the mounting plate. The vibrations transmitted to the vehicle body frame via the fixed plate are reduced by elastically deforming along the central axis direction to attenuate the input vibration.

The damping of the input vibration due to the elastic deformation of the rubber elastic body can increase the rubber amount by increasing the long axis direction of the rubber elastic body parallel to the crankshaft of the engine , and the spring constant can be set without increasing the hardness. And excellent vibration damping characteristics can be secured. In particular, the distance between the center shaft and the engine can be reduced, the load on the mounting bolt is reduced, and the durability of the mounting bolt is improved.

The invention of an anti-vibration device according to claim 2, which achieves the above object, includes an outer cylinder in which a flange extending in an annular shape is formed at a tip of a cylinder portion, and an inner cylinder disposed in the outer cylinder. A pair of anti-vibration rubber having a rubber elastic body interposed between the flange and the outer peripheral surface of the inner cylinder; a base end coupled to the engine by a mounting bolt; and a mounting portion extending to the base end. comprising a bracket bolt insertion holes bored in the parts, a fixed plate mounting hole is drilled to insert said tubular portion provided on the vehicle body frame, and a mounting plate bolt insertion hole is bored, The pair of rubber elastic bodies are opposed to the base ends of the inner cylinders and are connected to the vehicle body frame with a fixing plate sandwiched between the pair of flanges, while the pair of rubber elastic bodies are axially outward of the pair of rubber elastic bodies. each volume of the bracket and the mounting plate respectively arranged The pair of rubber elastic bodies are sandwiched between the mounting portion of the bracket and the mounting plate by a fixing bolt inserted into the insertion hole and the pair of inner cylinders and a nut screwed to the fixing bolt, and the fixing bolt An anti-vibration device in which an offset load along a central axis direction extending from the engine is input to each anti-vibration rubber from the engine via the bracket, and the rubber elastic body is a short axis that contacts and separates from the engine An outer peripheral surface having a major axis direction that is a minor axis and a major axis direction that is orthogonal to the minor axis direction is formed as a major axis, and the major axis direction is parallel to the crankshaft extending direction of the engine.

According to the present invention, when an offset vibration load along the central axis direction is input from the engine via the bracket mounting portion, the rubber elastic body of each vibration isolating rubber is attached between the bracket and the fixed plate and attached to the fixed plate. The vibrations transmitted to the vehicle body frame via the fixed plate are reduced by elastically deforming along the direction of the central axis with the plate to attenuate the input vibration. The damping of the input vibration due to the elastic deformation of this rubber elastic body can increase the amount of rubber by increasing the long axis direction of the rubber elastic body parallel to the crankshaft of the engine , and it is possible to set the spring constant and excellent vibration damping Characteristics can be secured. In particular, the distance between the center shaft and the engine can be reduced, the load on the mounting bolt is reduced, and the durability of the mounting bolt is improved.

According to a third aspect of the present invention, in the vibration isolator according to the first or second aspect, the bracket includes a base portion coupled to a side portion of the engine and a mounting portion extending from the base portion in the minor axis direction. It is characterized by having an L shape.

The present invention specifically shows a bracket, and is formed in a simple L shape having a base portion coupled to a side portion of an engine and a mounting portion extending from the base portion in a minor axis direction.

  According to a fourth aspect of the present invention, in the vibration isolator of the first aspect, the mounting hole formed in the mounting portion of the bracket is circular in cross section, and the cylindrical portion of the outer cylinder is used as the mounting hole of the bracket. It is characterized by a cylindrical shape that can be inserted.

  According to the present invention, since the cylindrical portion of the outer cylinder is formed in a cylindrical shape as in the prior art, existing brackets, fixing plates, mounting plates, mounting bolts, nuts, and the like can be used. Excellent compatibility with rubber and versatility.

  The invention according to claim 5 is the vibration isolator according to any one of claims 1 to 4, wherein the rubber elastic body has a symmetrical shape in the minor axis direction and the major axis direction. To do.

  According to the present invention, the rubber elastic body is formed symmetrically with respect to the major axis and the minor axis orthogonal to each other on the central axis, so that the rubber is evenly distributed in the major axis direction and the minor axis direction around the central axis. Increased amount can be secured. Further, the rubber amount of the rubber elastic body is an object in the major axis direction and the minor axis direction, and the rubber elastic body can be elastically deformed well along the central axis to ensure excellent vibration damping.

According to the present invention, the amount of rubber can be increased by increasing the rubber elastic body in the major axis direction, the spring constant can be set without increasing the hardness of the rubber elastic body, and excellent vibration damping characteristics can be secured. Further, the distance between the center shaft and the engine can be reduced, the load on the mounting bolt is reduced, and the durability of the mounting bolt is improved.

An embodiment of the vibration isolator according to the present invention, the case of mounting the engine on a body frame of the construction設用machine will be described with reference to FIGS example.

  FIG. 1 is a schematic plan view schematically showing a state in which an engine 40 is mounted on a vehicle body frame 1 via a vibration isolator 10 that is a plurality of, in the present embodiment, four engine mounts, on the vehicle body frame 1. Reference numeral 41 denotes a crankshaft of the engine 40, and F denotes an extending direction of the crankshaft 41 of the engine 40.

  Each vibration isolator 10 is arranged symmetrically on both sides with respect to the extending direction F of the crankshaft 41 of the engine 40 and is installed between the side portion 40 a of the engine 40 and the vehicle body frame 1. These anti-vibration devices 10 have the same configuration, and only one anti-vibration device 10 will be described for convenience of explanation.

  The vibration isolator 10 will be described with reference to FIGS. 2 is an enlarged view of part A in FIG. 1, FIG. 3 is a cross-sectional view taken along the line II in FIG. 2, and FIG. 4 is a cross-sectional view taken along the line II-II in FIG.

  The vibration isolator 10 includes a bracket 42 coupled to a side portion 40a of the engine 40 by a mounting bolt 45, a fixing plate 11 and a mounting plate 12 provided on the vehicle body frame 1, a pair of vibration isolating rubber 20, a fixing bolt 35, and a nut. 36 and the like, and a bracket 42 coupled to the side portion 40a of the engine 40 is attached to the mounting bolt 35 via a pair of anti-vibration rubber 20 disposed between the fixing plate 11 and the mounting plate 12 attached to the vehicle body frame 1. The engine 40 is mounted on the vehicle body frame 1 by being attached to the vehicle body frame 1 by the nut 36.

  For convenience of explanation, prior to the description of the vibration isolator 10, the vibration isolator 20 used in the vibration isolator 10 will be described with reference to FIGS. 5 is a plan view of the anti-vibration rubber 20, FIG. 6 is a sectional view taken along line III-III in FIG. 5, FIG. 7 is a sectional view taken along line IV-IV in FIG.

  The anti-vibration rubber 20 includes a cylindrical tube portion 22 extending in the central axis Z direction serving as an axis of the fixing bolt 35, an outer tube 21 having a flange 23 protruding annularly at the tip of the tube portion 22, and a fixing bolt 35 is a cylindrical shape through which 35 can pass, and is disposed in the outer cylinder 21, and a front end 25 b projects from the flange 23 in the central axis Z direction, and is disposed on the same axis as the outer cylinder 21. A rubber elastic body 30 is integrally formed by vulcanization adhesion between the inner peripheral surface 22a of the cylindrical portion 22 and the mounting surface 23a of the flange 23 and the outer peripheral surface 25a of the inner cylinder 25, and the outer cylinder 21 and the inner cylinder The cylinder 25 is elastically coupled with the rubber elastic body 30 interposed therebetween.

  The flange 23 formed at the tip of the outer cylinder 21 has a major axis direction L1 which is orthogonal to each other on the central axis Z in a plan view and parallel to the extending direction F of the crankshaft 41 of the engine 40, and the engine The minor axis direction L2 that is in contact with and away from 40 is a planar shape having an elliptical outer peripheral edge 23b having a minor axis, and is formed symmetrically with respect to the major axis direction L1 and the minor axis direction L2.

  The rubber elastic body 30 has an outer peripheral edge 31b on the base end face 31 side that is vulcanized and bonded to the mounting surface 23a of the flange 23 of the outer cylinder 21, and a major axis D1 in the major axis direction L1 and a short axis substantially following the outer peripheral edge 23b of the flange 23. It has an elliptical shape with a minor axis D2 in the axial direction L2. On the other hand, the top surface 32 formed flush with the distal end 25b of the inner cylinder 25 has a major axis d1 and a minor axis d2 that are smaller than the major axis D1 and minor axis D2 on the base end surface 31 side in the major axis direction L1 and minor axis direction L2, respectively. It is formed in a planar shape parallel to the base end face 31 having an elliptical outer peripheral edge 32b provided with. An annular groove 32 a is formed on the top surface 32 along the outer periphery of the tip 25 b of the inner cylinder 25.

  The outer peripheral surface 33 formed between the outer peripheral edge 31 b of the base end surface 31 of the rubber elastic body 30 and the outer peripheral edge 32 b of the top surface 32 is from the outer peripheral edge 31 b side of the base end surface 31 to the outer peripheral edge 32 b side of the top surface 32. It is formed in the shape of an elliptical cone that is gradually reduced in diameter as it shifts to.

  Thus, by forming the rubber elastic body 30 in an elliptical truncated cone shape having a major axis direction L1 orthogonal to the major axis and a minor axis direction L2 as a minor axis, for example, the minor axis dimension of the rubber elastic body 30 in the minor axis direction L2 Is set to be the same as the dimension in the radial direction of the conventional truncated cone-shaped rubber elastic body, the amount of rubber is increased by increasing the dimension in the major axis direction L1 without increasing the dimension in the minor axis direction L2. The spring constant in the central axis Z direction can be set high without increasing the hardness of the rubber elastic body 30. Further, the rubber elastic body 30 is formed symmetrically with respect to the major axis L1 and the minor axis L2 orthogonal to each other on the central axis Z, so that the major axis direction L1 and the minor axis direction L2 are centered on the central axis Z. And even amount of rubber can be increased.

  The anti-vibration rubber 20 is set so that the base end 22c of the cylindrical portion 22 of the outer cylinder 21 protrudes by a predetermined amount in the central axis Z direction from the base end 25c of the inner cylinder 25 in an unloaded state.

  On the other hand, as shown in FIGS. 2 to 4, the fixing plate 11 and the mounting plate 12 attached to the vehicle body frame 1 can abut the entire top surface 32 of the rubber elastic body 30 in the axial direction over the entire surface. Bolt insertion holes 11a and 12a that are planar and penetrate in the central axis Z direction are formed.

  The bracket 42 is bent in a direction away from the side portion 40a of the engine 40 at the lower end or upper end of the base portion 43 and the lower end of the base portion 43 in this embodiment, and attached to the side portion 40a of the engine 40 by a mounting bolt 45. An attachment hole 44a having a circular cross-section, which is formed in a substantially L-shaped section having an attachment portion 44 and into which the cylindrical portion 22 of the outer cylinder 21 can be inserted, is formed in the attachment portion 44 along the central axis Z direction.

  As shown in FIGS. 3 and 4, the pair of anti-vibration rubbers 20 has the long axis direction L1 of each anti-vibration rubber 20 parallel to the extending direction F of the crankshaft 41 of the engine 40 and the short axis direction L2. In a plan view, the base ends 22c of the cylindrical portions 22 of the outer cylinders 21 face each other in a state of extending in a direction perpendicular to the crankshaft extending direction F and in contact with and separating from the bracket 42 base portion 43. The mounting portion 44 of the bracket 42 is sandwiched between the opposing flanges 23 of the outer tube 21 of the rubber 20, and the mounting hole 44 a is fitted into the tube portion 22.

  With the long axis direction L1 of each anti-vibration rubber 20 positioned in parallel with the extending direction F of the crankshaft 41, the fixed plate 11 and the mounting plate 12 disposed on the outer side in the axial direction of the anti-vibration rubbers 20 Place between. Further, the fixing bolt 35 is inserted from the bolt insertion hole 12a of the mounting plate 12 set on the vibration isolating rubber 20, and the inner cylinder 25 of each anti-vibration rubber 20 and the bolt insertion hole 11a of the fixing plate 11 are penetrated. In addition, a nut 36 is screwed with a washer 37 interposed at the tip of the fixing bolt 35 protruding from the bolt insertion hole 11 a of the fixing plate 11.

  At this time, the nut 36 is fastened to the fixing bolt 35 until the base ends 25c of the inner cylinders 25 of the antivibration rubbers 20 come into contact with each other. As a result, the mounting portion 44 of the bracket 42 is sandwiched between the flanges 23 of the outer cylinders 21, and the rubber elastic bodies 30 are respectively moved in the central axis Z direction by the fixing plate 11 and the mounting plate 12 approaching each other from the outside in the axial direction. Compression is applied by a preset preliminary compression amount, and a required repulsive force is generated with respect to the load in the central axis Z direction inputted from the mounting portion 44 of the bracket 42 and the fixed plate 11 and the mounting plate 12.

  By mounting the engine 40 on the vehicle body frame 1 via the vibration isolator 10 configured as described above, a load due to the weight of the engine 40 or the like is applied to each vibration isolator 10 via the bracket 42 in the direction of the central axis Z. The offset support load is input, and the engine 40 is supported on the vehicle body frame 1 by the repulsive force of the rubber elastic body 30 interposed between the fixing plate 11 and the bracket 42 of each vibration isolator 10.

  On the other hand, when an offset vibration load along the central axis Z direction is input from the engine 40 side through the mounting portion 44 of the bracket 42 as the engine 10 is operated or travels, the rubber elastic bodies 30 of the antivibration rubbers 20 are The elastic plate is elastically deformed in the opposite direction along the central axis Z direction between the bracket 42 and the fixing plate 11 and between the bracket 42 and the mounting plate 12, that is, in the compression direction or the tensile direction, and the input vibration is attenuated. The vibration transmitted to the vehicle body frame 1 through 11 is reduced.

  The attenuation of the input vibration due to the elastic deformation of the rubber elastic body 30 in the compression direction or the tensile direction can increase the amount of rubber without increasing the dimension in the short axis direction L2 due to the increase in the long axis direction L1 of the rubber elastic body 30. The spring constant can be set without increasing the hardness, and the rubber amount of the rubber elastic body 30 is the target in the long axis direction L1 and the short axis direction L2, and the rubber elastic body 30 is along the central axis Z. It is possible to secure excellent vibration damping by elastically deforming well.

  On the other hand, since the rubber amount can be increased without increasing the dimension in the short axis direction L2 by increasing the long axis direction L1 of the rubber elastic body 30, the flange 23 and the rubber projecting from the central axis Z side to the engine 40 side. The dimension of the elastic body 30 can be suppressed, the dimension c from the base 43 of the bracket 42 to the central axis Z can be reduced, the moment acting on the mounting bolt 45 is reduced, and the load on the mounting bolt 45 is reduced. Decrease. By reducing the load on the mounting bolt 45, deformation and damage of the mounting bolt 45 can be prevented and durability can be improved.

  Further, the flange 23 of the outer cylinder 21 constituting the vibration isolating rubber 20 and the dimensions of the rubber elastic body 30 and the flange 23 projecting from the central axis Z toward the engine 40 side while the dimension of the anti-vibration rubber 20 in the short axis direction L2 are suppressed. Since the cylindrical portion 22 of the outer cylinder 21 is formed in a cylindrical shape as in the conventional case, it is possible to use existing brackets, fixing plates, mounting plates, mounting bolts, nuts, and the like. In addition, it is excellent in compatibility with conventional anti-vibration rubber, and versatile.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, in the above embodiment, the bracket mounting portion is sandwiched between the flanges of the pair of rubber elastic bodies, and the fixing plate is arranged on the outer side in the axial direction of the rubber elastic body. And the mounting portion of the bracket can be disposed outside the rubber elastic body in the axial direction.

An example of this vibration isolating apparatus with reference to the sectional view shown in FIG. 9 corresponds to FIG. 3 will be described. 9, parts corresponding to those in FIG. 3 are given the same reference numerals, and detailed descriptions thereof are omitted.

  In the vibration isolator 10, the long axis direction L1 of each vibration isolating rubber 20 is parallel to the extending direction F of the crankshaft 41 of the engine 40, and the short axis direction L2 is orthogonal to the crankshaft extending direction F in a plan view. Then, the base ends 22c of the cylindrical portions 22 of the outer cylinders 21 face each other in a state of extending in the direction of contact with and away from the base portion 43 of the bracket 42, and between the opposing flanges 23 of the outer cylinders 21 of the antivibration rubbers 20 Then, the fixing plate 11 is clamped and the cylindrical portion 22 is fitted into the mounting hole 11 b of the fixing plate 11. The mounting portion 44 of the bracket 42 and the mounting plate 12 are disposed on the outer side in the axial direction of both the vibration isolating rubbers 20. Further, a fixing bolt 35 is inserted from a bolt hole 44b drilled in the mounting portion 44 of the bracket 42 set on the outer side in the axial direction of both the anti-vibration rubbers 20, and the inner cylinder 25 and the attachment plate 12 of each anti-vibration rubber 20 are inserted. The nut 36 is screwed with a washer 37 interposed at the tip of the fixing bolt 35 that passes through the bolt hole 12 a and protrudes from the mounting plate 12.

  In this structure, when an offset vibration load along the central axis Z direction is input from the engine 40 via the mounting portion 44 of the bracket 42, the rubber elastic body 30 of each anti-vibration rubber 20 is attached to the bracket 42 and the fixing plate 11. And between the fixed plate 11 and the mounting plate 12 are each elastically deformed along the central axis Z direction to attenuate the input vibration, and the vibration transmitted to the vehicle body frame via the fixed plate 11 is reduced. .

  Since the rubber amount can be increased without increasing the dimension in the short axis direction L2 by increasing the major axis direction L1 of the rubber elastic body 30, the flange 23 and the rubber elastic body projecting from the central axis Z side to the engine 40 side. 30 can be suppressed, the dimension c from the base 43 of the bracket 42 to the central axis Z can be reduced, the moment acting on the mounting bolt 45 is reduced, and the load on the mounting bolt 45 is reduced. . By reducing the load on the mounting bolt 45, deformation and damage of the mounting bolt 45 can be prevented and durability can be improved.

  Further, in the above embodiment, vibration prevention using the vibration-proof rubber 20 provided with the flange 23 of the elliptical outer cylinder 21 having the major axis direction L1 having the major axis and the minor axis direction L2 having the minor axis and the rubber elastic body 30 is provided. Although the apparatus 10 has been described as an example, it is also possible to use various anti-vibration rubbers whose length in the minor axis direction L2 is smaller than that in the major axis direction L1.

A specific example of this type of anti-vibration rubber will be described with reference to FIG. 10A is a plan view of the vibration-proof rubber 50, FIG. 10B is a sectional view taken along the line V - V in FIG. 10A, FIG. 10C is a sectional view taken along the line VI - VI in FIG. It is C arrow line view of c).

  The anti-vibration rubber 50 has a cylindrical cylindrical part 52 extending in the central axis Z direction, an outer cylinder 51 having a flange 53 protruding annularly at the tip of the cylindrical part 52, and a cylindrical shape through which the fixing bolt 35 can pass. An inner cylinder 55 which is accommodated in the outer cylinder 51 and whose tip protrudes from the flange 53 in the direction of the central axis Z and is arranged coaxially with the outer cylinder 51, and an inner peripheral surface and a flange of the cylindrical portion 52 of the outer cylinder 51 53 is constituted by a rubber elastic body 60 integrated by vulcanization adhesion between the mounting surface of 53 and the outer peripheral surface of the inner cylinder 55, and the outer cylinder 51 and the inner cylinder 55 are elastic with the rubber elastic body 60 interposed therebetween. Connected to

  The flange 53 formed at the tip of the outer cylinder 51 has a pair of arcuate short-axis-side outer peripheral edges 53c having a center axis Z as a center and a short-axis direction L2 as a diameter, and a short-axis direction on the center axis Z. A pair of U-shaped long-axis-side outer peripheral edges 53d projecting in the long-axis direction L1 orthogonal to L2 has a planar shape having an outer peripheral edge 53b, and are in the long-axis direction L1 and the short-axis direction L2. Are formed symmetrically.

  In the rubber elastic body 60, a pair of opposed outer diameters 61b of the base end face 61 that is vulcanized and bonded to the mounting surface of the flange 53 of the outer cylinder 51 has a short axis direction L2 that follows the outer edge 53b of the flange 53 as a diameter. The outer peripheral edge 61b of the arc-shaped short-axis-side outer peripheral edge 61c and a pair of U-shaped long-axis-side outer peripheral edges 61d projecting in the long-axis direction L1 are continuous. It has a major axis D2 in the direction and a minor axis D1 in the minor axis direction L2, and is formed symmetrically with respect to the major axis direction L1 and the minor axis direction L2. On the other hand, the top surface 62 formed flush with the tip of the inner cylinder 55 has a pair of arcuate short-axis-side outer peripheral edges 62c having a diameter in the direction of the short axis L2 and a pair protruding in the long-axis direction L1. The U-shaped long-axis-side outer peripheral edge 62d has an outer peripheral edge 62b, and the outer peripheral edge 62b has a major axis d2 and a minor axis in the major-axis direction L1 smaller than the major axis D1 and minor axis D2 on the base end face 61 side, respectively. It has a minor axis d1 in the L2 direction. The outer peripheral surface 63 of the rubber elastic body 60 is formed in a conical surface shape that gradually decreases in diameter as it moves from the outer peripheral edge 61 b of the base end surface 61 to the outer peripheral edge 62 b of the top surface 62.

Still another specific example of the vibration-proof rubber will be described with reference to FIG. (A) is a plan view of a vibration-proof rubber 70 in FIG. 11, (b) the V II -V II line sectional view of (a), (c) the V III -V III line sectional view of (a), ( d) is a view on arrow D in (c).

  The anti-vibration rubber 70 has a cylindrical cylindrical portion 72 extending in the central axis Z direction, an outer cylinder 71 having a flange 73 projecting annularly at the tip of the cylindrical portion 72, and a cylindrical shape through which the fixing bolt 35 can pass. An inner cylinder 75 that is accommodated in the outer cylinder 71 and has a tip projecting from the flange 73 in the central axis Z direction and disposed coaxially with the outer cylinder 71, and an inner peripheral surface and a flange of the cylinder portion 72 of the outer cylinder 71 73 is constituted by a rubber elastic body 80 integrated by vulcanization adhesion between the mounting surface of 73 and the outer peripheral surface of the inner cylinder 75, and the outer cylinder 71 and the inner cylinder 75 are elastic with the rubber elastic body 80 interposed therebetween. Connected to

  The flange 73 formed at the tip of the outer cylinder 71 has a planar shape having a rectangular outer peripheral edge 73b having a major axis in the major axis L1 direction and a minor axis in the minor axis direction L2 perpendicular to each other on the central axis Z. They are formed symmetrically with respect to the major axis direction L1 and the minor axis direction L2.

  In the rubber elastic body 80, the outer peripheral edge 81b of the base end surface 81 that is vulcanized and bonded to the mounting surface of the flange 73 of the outer cylinder 71 has a major axis direction D1 in the major axis direction L1 and a minor axis direction substantially following the outer peripheral edge 73b of the flange 73. It is formed in a substantially rectangular shape with a short diameter D2 of L2. On the other hand, the top surface 82 formed flush with the distal end 75b of the inner cylinder 75 has a major axis d1 and a minor axis d2 smaller than the major axis D1 and minor axis D2 on the base end surface 81 side in the major axis direction L1 and minor axis direction L2, respectively. Is formed in a planar shape having a substantially rectangular outer peripheral edge 82b. Further, the outer peripheral surface 83 of the rubber elastic body 80 is formed in a conical surface shape that is gradually reduced in diameter as it moves from the outer peripheral edge 81 b of the base end surface 81 toward the outer peripheral edge 82 b of the top surface 82.

It is a schematic plan view which shows typically the engine mounting state which concerns on embodiment. It is the A section enlarged view of FIG. It is the II sectional view taken on the line of FIG. It is the II-II sectional view taken on the line of FIG. It is a top view of anti-vibration rubber. It is the III-III sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG. It is a B arrow line view of FIG. It is sectional drawing corresponding to FIG. 2 which shows another vibration isolator. It is explanatory drawing of anti-vibration rubber, (a) is a top view, (b) is a VV line sectional view of (a), (c) is a VI-VI line sectional view of (a), (d) is It is C arrow line view of (c). It is explanatory drawing of an anti-vibration rubber, (a) is a top view, (b) is a VII-VII line sectional view in (a), (c) is a VIII-VIII line sectional view of (a), (d) is It is a D arrow line view of (c). It is explanatory drawing of the conventional vibration isolator.

Explanation of symbols

1 Body frame (vibration receiver)
DESCRIPTION OF SYMBOLS 10 Anti-vibration apparatus 11 Fixing plate 12 Mounting plate 20 Anti-vibration rubber 21 Outer cylinder 22 Cylinder part 23 Flange 25 Inner cylinder 30 Rubber elastic body 31 Base end surface 32 Top surface 33 Outer peripheral surface 35 Fixing bolt 36 Nut 40 Engine 40 Side part 41 Crank Shaft 42 Bracket 43 Base 44 Mounting portion 44a Mounting hole 44b Bolt insertion hole 45 Mounting bolt 50 Anti-vibration rubber 51 Outer tube 52 Tube portion 53 Flange 55 Inner tube 60 Rubber elastic body 63 Outer peripheral surface 70 Anti-vibration rubber 71 Outer tube 72 Tube portion 73 Flange 75 Inner cylinder 80 Rubber elastic body 83 Outer peripheral surface Z Center axis F Crankshaft extending direction L1 Long axis direction L2 Short axis direction

Claims (5)

A pair of an outer cylinder in which an annularly extending flange is formed at the tip of the cylinder part and an inner cylinder disposed in the outer cylinder, and a rubber elastic body interposed between the flange and the outer peripheral surface of the inner cylinder Anti-vibration rubber
A bracket having a base end coupled to the engine by a mounting bolt and a mounting portion extending to the base end, and a mounting hole in which the cylindrical portion is inserted in the mounting portion;
A fixing plate provided on the vehicle body frame and having a bolt insertion hole,
And a mounting plate with a bolt insertion hole,
The pair of rubber elastic body is opposed to the proximal end of another of the inner tube, and while being connected to the bracket by sandwiching the mounting portion between the pair of flanges, axially outwardly of the pair of rubber elastic body the pair of elastic between the fixed plate and the mounting plate the fixed plate and the mounting plate by the bolt insertion holes and fixing bolts and nuts screwed into the fixing bolt inserted through the pair of the inner cylinder of placing each An anti-vibration device that clamps the body and inputs an offset load along a central axis direction in which the fixing bolt extends from the engine to each anti-vibration rubber through the bracket,
The rubber elastic body includes an outer peripheral surface in which a minor axis direction contacting and separating from the engine has a minor axis and a major axis direction orthogonal to the minor axis direction is a major axis, and the major axis direction is the crankshaft of the engine. A vibration isolator characterized by being parallel to the extending direction . A pair of an outer cylinder in which an annularly extending flange is formed at the tip of the cylinder part and an inner cylinder disposed in the outer cylinder, and a rubber elastic body interposed between the flange and the outer peripheral surface of the inner cylinder Anti-vibration rubber
A bracket having a base end coupled to the engine by a mounting bolt and a mounting portion extending to the base end, the bracket having a bolt insertion hole formed in the mounting portion;
A fixing plate provided in a vehicle body frame and provided with a mounting hole into which the cylindrical portion is inserted ;
And a mounting plate with a bolt insertion hole,
The pair of rubber elastic bodies are opposed to the base ends of the inner cylinders and are connected to the vehicle body frame with a fixing plate sandwiched between the pair of flanges, while the pair of rubber elastic bodies are axially outward of the pair of rubber elastic bodies. The pair of rubbers between the mounting portion of the bracket and the mounting plate by the fixing bolts inserted through the respective bolt insertion holes of the bracket and the mounting plate and the pair of inner cylinders and nuts screwed to the fixing bolts. An anti-vibration device that sandwiches an elastic body and that inputs an offset load along a central axis direction in which the fixing bolt extends from the engine to each anti-vibration rubber through the bracket,
The rubber elastic body includes an outer peripheral surface in which a minor axis direction contacting and separating from the engine has a minor axis and a major axis direction orthogonal to the minor axis direction is a major axis, and the major axis direction is the crankshaft of the engine. A vibration isolator characterized by being parallel to the extending direction. 3. The prevention according to claim 1, wherein the bracket is formed in an L shape having a base portion coupled to a side portion of the engine and a mounting portion extending from the base portion in the minor axis direction. Shaker. The mounting hole drilled in the mounting portion of the bracket has a circular cross section,
The vibration isolator according to claim 1, wherein the cylindrical portion of the outer cylinder has a cylindrical shape that can be fitted into the mounting hole of the bracket.   The vibration isolator according to any one of claims 1 to 4, wherein the rubber elastic body has a symmetrical shape in the short axis direction and the long axis direction.

Images