JP2012189142A - Vibration-isolating connecting rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration-isolating connecting rod which facilitates adjustment of a spring constant and is excellent in durability.SOLUTION: The vibration-isolating connecting rod includes a rod body equipped with a first cylinder part and a second cylinder part, a first vibration-isolating bush 18 which contains a first inner cylinder 22 and a first rubber-like elastic part that covers the outer periphery of the first inner cylinder, to be provided inside the first cylinder part, and a second vibration-isolating bush 20 provided inside the second cylinder part. A first metal plate 34 and a second metal plate 36 which is overlapped with the first metal plate are swaged and fixed with the rod body. The first rubber-like elastic part 24 includes a pair of protruding parts 26 which protrude outward in radial direction from the positions facing each other, on the outer peripheral surface of the first inner cylinder. The first cylinder part includes a pair of housing parts 38a in which the pair of protruding parts are inserted. The interval between bottom parts of the pair of housing parts is set to be shorter than the distance between tip faces 27 of the pair of protruding parts.

Description

  The present invention relates to an anti-vibration connecting rod that can be used as, for example, a torque rod for connecting an automobile engine to a vehicle body while preventing vibration.

  An anti-vibration connecting rod called a torque rod is provided between an automobile body and an engine which is a vibration generation source in order to suppress movement and vibration in the roll direction of the engine.

  As such an anti-vibration connecting rod, for example, a first cylinder part provided at one end part in the longitudinal direction, a second cylinder part provided at the other end part in the longitudinal direction, a first cylinder part and a second cylinder part, A rod body that connects the first body, a first inner cylinder and a first rubber-like elastic part, and a first vibration isolating bush provided in the first cylinder part; a second inner cylinder and a second rubber-like elastic part; And a second anti-vibration bush provided in the second cylinder portion, and is attached to an engine or a vehicle body using the first inner cylinder and the second inner cylinder as attachment members (see Patent Document 1 below). ).

  By the way, in the anti-vibration connecting rod, the demand for high durability has been increased with the recent increase in output of automobiles, and the rubber-like elastic portion has been improved in order to optimize characteristics such as ride comfort and handling stability. It is required that the spring constant of can be easily adjusted.

JP 2001-29432 A

  The present invention has been made in consideration of the above points, and an object thereof is to provide a vibration-isolating connecting rod that can easily adjust a spring constant and improve durability.

  The vibration-isolating connecting rod according to the present invention includes a first tube portion provided at one end portion in the longitudinal direction, a second tube portion provided at the other end portion in the longitudinal direction, the first tube portion, and the second tube portion. A first vibration isolating bush provided in the first cylindrical portion, the rod main body connecting the cylindrical portion; a first inner cylinder; and a first rubber-like elastic portion covering an outer peripheral portion of the first inner cylinder. A second anti-vibration bush provided in the second cylinder portion with a second inner cylinder and a second rubber-like elastic portion covering an outer peripheral portion of the second inner cylinder, In the anti-vibration connecting rod obtained by caulking and fixing one metal plate and the second metal plate superimposed on the first metal plate, the first rubber-like elastic portion is formed on the outer peripheral surface of the first inner cylinder. A pair of convex portions projecting radially outward from positions facing each other are provided, and the first cylindrical portion is a pair of housings into which the pair of convex portions are fitted. The provided spacing the bottom of said pair of housing portions, characterized in that provided less than the distance of the front end faces of the pair of convex portions.

  Further, in the above-described anti-vibration connecting rod of the present invention, the pair of accommodating portions may be provided at a line-symmetrical position with a straight line connecting the first inner cylinder and the second inner cylinder as an axis of symmetry, Further, a gap may be formed between the first rubber elastic body and the first tube portion in the direction in which the straight line extends.

  Furthermore, in the anti-vibration connecting rod according to the present invention, the pair of housing portions includes at least one of a direction in which a straight line connecting the first inner cylinder and the second inner cylinder extends and an axial direction of the first inner cylinder. The pair of convex portions may be compressed.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to adjust a spring constant easily, the vibration-proof connection rod excellent in durability can be provided.

It is a top view of the vibration isolating connecting rod which concerns on one Embodiment of this invention. It is a disassembled perspective view of the vibration isolating connecting rod which concerns on one Embodiment of this invention. It is AA sectional drawing of FIG. It is a perspective view of the state where the 1st metal plate and the 2nd metal plate were piled up. (A) is a top view of the state which piled up the 1st metal plate and the 2nd metal plate, (b) is a top view of the 1st anti-vibration bush. (A) is BB sectional drawing of FIG. 4, (b) is a side view of a 1st anti-vibration bush. It is a disassembled perspective view which shows the assembly method of the vibration isolating connection rod which concerns on one Embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  The anti-vibration connecting rod 10 of this embodiment is a torque rod that is assembled between a vehicle body of an automobile and an engine that is a vibration generation source, and suppresses movement and vibration in the roll direction of the engine.

  As shown in FIGS. 1 and 2, the vibration-isolating connecting rod 10 includes a rod body 16 having a first cylinder portion 12 and a second cylinder portion 14, and a first anti-vibration rod provided on the first cylinder portion 12. It consists of a vibration bush 18 and a second vibration isolation bush 20 provided in the second cylinder portion 14.

  The first anti-vibration bush 18 covers the first inner cylinder 22 arranged in parallel with the first cylinder portion 12 and the outer peripheral surface of the first inner cylinder 22, and the first inner cylinder 22 and the first cylinder portion 12. It is comprised from the 1st rubber-like elastic part 24 interposed between.

  The first inner cylinder 22 is a cylindrical member made of metal such as iron, steel, and aluminum, and is connected to either the vehicle body or the engine, for example, the vehicle body side. The first rubber-like elastic portion 24 is integrally vulcanized and bonded to the outer peripheral surface of the first inner cylinder 22, and is a pair that protrudes radially outward from positions facing each other on the outer peripheral surface of the first inner cylinder 22. The convex part 26 is provided.

  The pair of convex portions 26 includes a pair of first side surface portions 26-1 that are parallel to the axis O 1 direction of the first inner cylinder 22 and the protruding direction of the convex portion 26, and the axis of the first inner cylinder 22. It has a substantially prismatic shape including a pair of second side surface portions 26-2 that form a plane perpendicular to the center O1 and a tip surface 27 that is perpendicular to the protruding direction of the convex portion 26.

  The second anti-vibration bush 20 covers the second inner cylinder 28 that is arranged in parallel and coaxially in the second cylindrical portion 14 provided in a cylindrical shape, and covers the outer peripheral surface of the second inner cylinder 28. It is comprised from the 2nd rubber-like elastic part 30 interposed between the pipe | tube 28 and the 2nd cylinder part 14. As shown in FIG.

  Similar to the first inner cylinder 22, the second inner cylinder 28 is a cylindrical member made of metal such as iron, steel, or aluminum, and is connected to either the vehicle body or the engine, for example, the engine side. The second rubber-like elastic portion 30 is integrally vulcanized and bonded to the outer peripheral surface of the second inner cylinder 28, and has an annular shape that bulges outward in the radial direction at the axial central portion of the second inner cylinder 28. A bulging portion 32 is provided.

  The rod body 16 includes a first cylinder portion 12 that holds the first vibration isolating bush 18 at one end in the longitudinal direction L, a second cylinder portion 14 that holds the second vibration isolating bush 20 at the other end, The cylindrical portion 12 and the second cylindrical portion 14 are connected to each other, and the first metal plate 34 and the second metal plate 36 having the same shape are overlapped with each other.

  Specifically, as shown in FIGS. 2 and 4, the first cylindrical portion 12 is provided in a cylindrical shape having a rectangular shape with rounded corners, and is recessed outwardly on the inner peripheral surface thereof. A pair of first rubber accommodating portions 38 is provided.

  The pair of first rubber accommodating portions 38 includes an axial center O1 of the first inner cylinder 22 of the first vibration isolation bush 18 provided in the first cylinder portion 12 and a second anti-vibration provided in the second cylinder portion 14. A line symmetric position having a straight line C (hereinafter referred to as a center line) C connecting the axis O2 of the second inner cylinder 28 of the vibration bush 20 as a symmetry axis, in other words, in the axial direction of the center line C and the first cylinder portion 12. It is disposed opposite to the direction W (hereinafter referred to as the width direction of the vibration-isolating connecting rod 10) W.

  The pair of first rubber accommodating portions 38 has a concave shape in which the convex portion 26 provided in the first rubber-like elastic portion 24 of the first vibration isolating bush 18 is fitted and holds the first vibration isolating bush 18. Specifically, as shown in FIGS. 5 and 6, a pair of first side walls 38-1 having a plane perpendicular to the center line C and sandwiching the first side surface part 26-1 of the convex part 26, A pair of second side walls 38-2 having a plane perpendicular to the axial direction of the one cylindrical portion 12 and sandwiching the second side surface portion 26-2 of the convex portion 26, and the width direction W of the vibration proof connecting rod 10 And a bottom 39 having a vertical plane.

  The pair of first rubber accommodating portions 38 is provided such that the distance A1 between the bottom portions 39 of the first rubber accommodating portion 38 is smaller than the distance B1 between the front end surfaces 27 of the pair of convex portions 26 provided on the first vibration isolating bush 18. It has been. Further, in the first rubber accommodating portion 38, the distance A <b> 2 between the pair of first side walls 38-1 is greater than the distance B <b> 2 between the pair of first side surface portions 26-1 provided on the convex portion 26 of the first vibration isolation bush 18. The distance A3 between the pair of second side walls 38-2 is smaller than the distance B3 between the pair of second side surface parts 26-2 provided on the convex part 26 of the first vibration isolating bush 18.

  Such a first tube portion 12 is provided with a gap 13 between the first rubber-like elastic portion 24 of the first vibration isolating bush 18 and the inner peripheral surface of the first tube portion 12 in the direction in which the center line C extends. The first vibration isolating bush 18 is held by the pair of first rubber accommodating portions 38.

  The 2nd cylinder part 14 is provided in the cylindrical shape, and the cyclic | annular 2nd rubber accommodating part 40 which sinks outward is provided in the internal peripheral surface. In the second rubber accommodating portion 40, an annular bulging portion 32 provided in the second rubber-like elastic portion 30 of the second vibration isolating bush 20 is fitted, and the second vibration isolating bush 20 is held.

  A plurality of through holes 60 (two in this embodiment) penetrating the first metal plate 34 and the second metal plate 36 are provided in the connecting portion 15 that connects the first tube portion 12 and the second tube portion 14. ing. The two through holes 60 are in a line-symmetric position with the center line C as the axis of symmetry, that is, in a position where the straight line connecting the two through holes 60 is orthogonal to the center line C and the distance to the center line C is equal. Is provided.

  As shown in FIGS. 2 to 4, the first metal plate 34 constituting the rod body 16 is formed by press-molding a metal plate into a predetermined shape, and has a rectangular shape with rounded corners at one end in the longitudinal direction L. The first rectangular hole portion 42 is formed with a circular first circular hole portion 46 at the other end, and two through holes are provided between the first rectangular hole portion 42 and the first circular hole portion 46. A hole 60a is formed.

  A first cylindrical portion 12 a that rises outward from the rod body 16 (that is, in a direction away from the second metal plate 36 superimposed on the first metal plate 34) is formed at the peripheral portion of the first rectangular hole portion 42. . The first cylinder portion 12 a is provided with a first rubber accommodating portion 38 a that is recessed outward from the first cylinder portion 12 a and opens to a mating surface with the second metal plate 36.

  A second cylinder portion 14 a that rises outward from the rod body 16 is formed at the peripheral edge of the first circular hole portion 46. The second cylindrical portion 14a is provided with a tapered second rubber accommodating portion 40a that inclines radially inward from the peripheral edge of the first circular hole portion 46 toward the distal end side.

  The second metal plate 36 is formed by press-molding a metal plate in the same shape as the first metal plate 34. Specifically, as shown in FIGS. A rectangular second rectangular hole portion 44 with rounded corners is formed, and a circular second circular hole portion 48 is formed at the other end, and the second rectangular hole portion 44 and the second circular hole portion 48 are also formed. Two through holes 60b are formed between the two.

  A first cylindrical portion 12b that rises outward from the rod body 16 (that is, in a direction away from the first metal plate 34 superimposed on the second metal plate 36) is formed at the peripheral edge of the second rectangular hole 44. . The first tube portion 12b is provided with a first rubber housing portion 38b that is recessed outward from the first tube portion 12a and opens to a mating surface with the first metal plate 34.

  A second cylinder portion 14 b that rises outward from the rod body 16 is formed at the peripheral edge of the second circular hole portion 48. The second cylindrical portion 14b is provided with a tapered second rubber accommodating portion 40b that is inclined radially inward from the peripheral edge of the second circular hole portion 48 toward the distal end side.

  Then, as shown in FIG. 4, by superimposing the first metal plate 34 and the second metal plate 36 arranged so as to be reversed with the center line C as a rotational symmetry axis with respect to the first metal plate 34, A first tube portion 12 having a first rubber housing portion 38 formed by connecting the first rubber housing portion 38a and the first rubber housing portion 38b is formed from the first tube portion 12a and the first tube portion 12b, and A second cylindrical portion 14 having a second rubber accommodating portion 40 formed by connecting the second rubber accommodating portion 40a and the second rubber accommodating portion 40b is formed from the second cylindrical portion 14a and the second cylindrical portion 14b.

  The two metal plates 34 and 36 overlapped in this way are provided on the plurality of (four in this embodiment) first caulking portions 50 provided on the first metal plate 34 and the second metal plate 36. The rod main body 16 is formed by caulking and fixing by a plurality of (four in this embodiment) second caulking portions 52.

  In order to assemble the anti-vibration connecting rod 10 having the above-described configuration, first, as shown in FIG. 7, one of the first metal plate 34 and the second metal plate 36 (for example, the second metal plate 36 here). ), The positioning pins 62 are inserted through the two through holes 60b. The positioning pin 62 is provided with a size that fits in the through hole 60a and the through hole 60b without any gap, and prevents the second metal plate 36 from being displaced.

  Next, the convex portion 26 of the first vibration isolating bush 18 is disposed on the first rubber accommodating portion 38b of the second metal plate 36 inserted through the positioning pin 62, and the second anti-vibration bushing is disposed on the second rubber accommodating portion 40b. Twenty bulges 32 are arranged. At this time, the pair A of the first side walls constituting the first rubber accommodating portion 38 is provided such that the distance A1 between the bottom portions 39 of the first rubber accommodating portion 38 is set smaller than the distance B1 between the tip surfaces 27 of the pair of convex portions 26. Since the interval A2 of 38-1 is smaller than the distance B2 between the pair of first side surface portions 26-1 provided on the convex portion 26, the convex portion 26 is in the direction along the center line C and the vibration isolating connecting rod. It fits in the 1st rubber | gum accommodation part 38b in the state pre-compressed to the 10 width direction W.

  In addition, although not shown in particular, in addition to the positioning pin 62 described above, the mounting table on which the second metal plate 36 is mounted is provided inside the first cylinder portion 12b and the second cylinder portion 14b of the second metal plate 36. The rod inserted into the predetermined position protrudes, and the convex portion 26 of the first anti-vibration bush 18 is inserted into the first rubber while the first inner cylinder 22 is inserted into the rod disposed inside the first cylinder portion 12b. The bulging portion 32 of the second anti-vibration bush 18 is disposed in the housing portion 38b and the second rubber housing portion 40b while the second inner tube 28 is inserted into the rod disposed inward of the second tube portion 14b. It arranges in.

  Next, the first metal plate 34, which has been turned upside down with respect to the second metal plate 36 with the center line C as the axis of rotational symmetry, is superimposed on the second metal plate 36 while the positioning pin 62 is inserted through the through hole 60a. Thus, the convex portion 26 of the first vibration isolating bush 18 is fitted into the first rubber accommodating portion 38a provided on the first metal plate 34, and the bulging portion of the second vibration isolating bush 20 is engaged with the second rubber accommodating portion 40b. 32 fits in.

  Since the distance A3 between the pair of second side walls 38-2 constituting the first rubber accommodating portion 38 is smaller than the distance B3 between the pair of second side surface portions 26-2 provided on the convex portion 26, the first vibration isolating bush When the 18 convex portions 26 are fitted into the first rubber accommodating portion 38a, the first convex portion 26 is pre-compressed in the axial direction O1 of the first inner cylinder 22.

  Next, a first caulking process is performed to bend the plurality of first caulking portions 50 provided on the first metal plate 34 so as to sandwich the peripheral edge portion of the second metal plate 36, and the first metal plate 34 and the second metal plate 34. The metal plate 36 is fixed by caulking.

  Then, a second caulking step of bending the plurality of second caulking portions 52 provided on the second metal plate 36 so as to sandwich the peripheral edge portion of the first metal plate 34 is performed, and the first metal plate 34 and the second metal After the plate 36 is further caulked and fixed, a positioning pin 62 inserted through a through hole 60 provided in the rod body 16 and a rod (not shown) inserted through the first inner cylinder 22 and the second inner cylinder 28 are connected. Pull out and complete the assembly of the anti-vibration connecting rod 10.

  As described above, in the present embodiment, the interval A1 between the bottom portions 39 of the pair of first rubber accommodating portions 38 that hold the convex portion 26 provided on the first rubber-like elastic portion 24 of the first vibration isolating bush 18 is convex. The two metal plates 34 and 36 are overlapped so that the convex portion 26 is sandwiched in the first rubber accommodating portion 38, and the caulking portions 50 and 52 are disposed. By caulking and fixing, the convex portion 26 is held in the first rubber accommodating portion 38 in a state in which the convex portion 26 is pre-compressed in the width direction W of the anti-vibration connecting rod 10, and the durability of the first rubber-like elastic portion 24 is improved. Can do.

  In addition, the spring constant of the anti-vibration connecting rod 10 can be changed by changing at least one of the distance A1 of the bottom 39 of the first rubber accommodating portion 38 and the distance B1 between the front end surfaces 27 of the convex portions 26. The spring constant of the vibration proof connecting rod 10 can be easily adjusted.

  In the vibration isolating connecting rod 10 of the present embodiment, the gap 13 is formed between the first rubber-like elastic portion 24 of the first vibration isolating bush 18 and the inner peripheral surface of the first cylindrical portion 12 in the direction in which the center line C extends. The spring constant in the direction along the center line C of the anti-vibration connecting rod 10 is low, the spring constant in the width direction W of the anti-vibration connecting rod 10 is high, and the spring constants in two directions orthogonal to each other are provided. The ratio can be set large.

  Furthermore, the first rubber accommodating portion 38 has a pair of first rubber accommodating portions 38 in addition to the distance A1 between the bottom portions 39 of the first rubber accommodating portion 38 being smaller than the distance B1 between the front end surfaces 27 of the convex portions 26. An interval A2 between the first side walls 38-1 is smaller than a distance B2 between the pair of first side surface portions 26-1 provided on the convex portion 26, and an interval A3 between the pair of second side walls 38-2 is equal to the convex portion 26. By changing these various dimensions, the spring constants in three orthogonal directions, that is, the vibration isolating connecting rod 10 Since the spring constant in the direction along the center line C, the spring constant in the width direction W of the anti-vibration connecting rod 10 and the spring constant in the axial direction O1 of the first inner cylinder 22 can be changed independently, Easy adjustment of spring characteristics It can be.

DESCRIPTION OF SYMBOLS 10 ... Anti-vibration connecting rod 12 ... 1st cylinder part 13 ... Gap 14 ... 2nd cylinder part 15 ... Connection part 16 ... Rod main body 18 ... 1st anti-vibration bush 20 ... 2nd anti-vibration bush 22 ... 1st inner cylinder 24 ... 1st rubber-like elastic part 26-1 ... 1st side part 26-2 ... 2nd side part 26 ... Convex part 27 ... End face 28 ... 2nd inner cylinder 30 ... 2nd rubber-like elastic part 32 ... Swelling part 34 ... 1st metal plate 36 ... 2nd metal plate 38 ... 1st rubber accommodating part 38-1 ... 1st side wall 38-2 ... 2nd side wall 39 ... Bottom part 40 ... 2nd rubber accommodating part 50 ... 1st crimping part 52 ... second caulking portion 60 ... through hole C ... center line L ... longitudinal direction O1 ... axial center O2 ... axial center W ... width direction

Claims (4)

A first cylinder part provided at one end part in the longitudinal direction, a second cylinder part provided at the other end part in the longitudinal direction, a rod body connecting the first cylinder part and the second cylinder part, A first anti-vibration bushing provided in the first cylinder portion with a first inner cylinder and a first rubber-like elastic portion covering an outer peripheral portion of the first inner cylinder; a second inner cylinder; and the second inner cylinder A second rubber-like elastic part covering the outer periphery of the cylinder, and a second vibration isolating bush provided in the second cylinder part, wherein the rod body includes a first metal plate and the first metal plate In the vibration-proof connecting rod formed by caulking and fixing the second metal plate superimposed on
The first rubber-like elastic portion includes a pair of convex portions projecting radially outward from positions facing each other on the outer peripheral surface of the first inner cylinder,
The first tube portion includes a pair of accommodating portions into which the pair of convex portions are fitted,
An anti-vibration connecting rod, wherein an interval between bottom portions of the pair of accommodating portions is provided smaller than a distance between tip surfaces of the pair of convex portions.   2. The antivibration connecting rod according to claim 1, wherein the pair of housing portions are provided at a line-symmetrical position with a straight line connecting the first inner cylinder and the second inner cylinder as a symmetry axis.   The anti-vibration connecting rod according to claim 2, wherein a gap is formed between the first rubber elastic body and the first cylindrical portion in a direction in which the straight line extends.   The pair of accommodating portions compress the pair of convex portions in at least one of a direction in which a straight line connecting the first inner cylinder and the second inner cylinder extends and an axial direction of the first inner cylinder. The vibration-isolating connecting rod according to claim 2 or 3.

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