JP2004340384A - Engine mount - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine mount for producing uniform distortion of a stopper rubber portion during load input in a direction perpendicular to a shaft. <P>SOLUTION: The curvature of radius of a one-direction side abutment portion 4S of the stopper rubber portion 4 is almost the same as the curvature of radius of the inner peripheral face of an engine side mounting bracket 2. A rubber thickness TO of a coating rubber 6 in one direction S is made constant in the peripheral direction. The one-direction side abutment portion 4S abuts on the inner peripheral face of the engine side mounting bracket 2 in a wide range while producing its uniform distortion. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to an engine mount interposed in a mounting portion of an engine to a vehicle body.

  2. Description of the Related Art Generally, an engine mount for controlling vibration transmitted from an engine to a vehicle body is interposed in a mounting portion of an engine such as an automobile to a vehicle body. FIG. 4 shows an example of the engine mount.

  The engine mount is a cylindrical body-side mounting bracket 101 mounted on the vehicle body, an engine-side mounting bracket 102 mounted on the engine side, and interposed between the vehicle-body mounting bracket 101 and the engine-side mounting bracket 102. It comprises a vibration-proof base 103 made of a rubber-like elastic body and a liquid chamber 104. The engine-side mounting bracket 102 has a substantially disc-shaped stopper rubber portion 107 composed of an outer peripheral flange 105 formed so as to project in a direction perpendicular to the axis and a covering rubber 106 covering the peripheral portion of the outer peripheral flange 105. It is projected in the direction.

  The engine-side mounting bracket 102 is disposed substantially concentrically at a distance from the vehicle-body-side mounting bracket 101, and its stopper rubber portion 107 faces the inner peripheral surface of the vehicle-body-side mounting bracket 101, and extends in a direction perpendicular to the axis. It absorbs the impact force at the time of load input to prevent deterioration of ride comfort.

  However, since the stopper rubber portion is disposed inside the vehicle-body-side mounting bracket, the radius of curvature of the outer peripheral edge is smaller than the radius of curvature of the inner peripheral surface of the vehicle-body-side mounting bracket. Therefore, when a load is input in the direction perpendicular to the axis, the tip end in the displacement direction of the stopper rubber portion first contacts the inner peripheral surface of the vehicle body-side mounting bracket with a small area, and the entire stopper rubber portion is distorted due to the distortion of the contacted portion. By approaching the vehicle body-side mounting bracket, the range of contact with the vehicle body-side mounting bracket gradually widens to both sides. Therefore, since the stopper rubber portion has a large distortion at a portion which first comes into contact with the vehicle body-side mounting bracket, the load in the direction perpendicular to the axis is repeatedly input due to long-time running on a rough road or the like, and the stopper rubber portion is cracked. May occur.

  In view of the above-mentioned problem, the present invention provides a protection device including a cylindrical vehicle body-side mounting bracket, an engine-side mounting bracket mounted on an engine side, and a rubber-like elastic body interposed between both mounting brackets. An engine mount comprising a vibration base and a substantially disk-shaped stopper rubber portion protruding from an engine-side mounting bracket in a direction perpendicular to an axis, and the stopper rubber portion is substantially concentric with the body-side mounting bracket at an interval. When the load is input in the direction perpendicular to the axis, the stopper rubber portion is brought into wide contact with the vehicle-body-side mounting bracket in the engine mounts arranged in the shape of a circle so that the distortion of the stopper rubber portion is made as uniform as possible. Here, the direction perpendicular to the axis refers to a direction orthogonal to the axial direction when a line direction passing through the center of the cylinder of the vehicle body-side mounting bracket is defined as the axial direction.

  As a specific means for contacting the stopper rubber portion with the vehicle body side mounting bracket in a wide range, the stopper rubber portion comes into contact with the inner peripheral surface of the vehicle body side mounting bracket when a load is input in one direction perpendicular to the axis. The radius of curvature of the outer peripheral edge of the one-side contact portion may be set to be larger than the radius of curvature of a concentric imaginary circle passing through one point of the outer peripheral edge of the stopper rubber portion. Then, compared with the case where the outer peripheral edge of the stopper rubber portion is set to be a circle concentric with the inner peripheral surface of the vehicle body side mounting bracket, the contact surface of the one-side contact portion with the vehicle body side mounting bracket is wider. And the local rubber distortion is eliminated. Here, the virtual circle is a concentric circle with the vehicle-body-side mounting bracket, and refers to a virtual circle passing at least one point on the outer peripheral edge of the stopper rubber portion.

  If the radius of curvature of the abutting portion on one side is larger than the virtual circle, it will come into wide contact with the vehicle body-side mounting bracket, but if the radius of curvature is larger than the inner peripheral surface of the vehicle body-side mounting bracket, , The hit surface is reduced. Therefore, it is preferable that the radius of curvature of the contact portion on one side is larger than the virtual circle and is equal to or smaller than the radius of curvature of the inner peripheral surface of the vehicle-body-side mounting bracket. In particular, if the radius of curvature of the one-way contact portion is set to be substantially the same as the radius of curvature of the inner peripheral surface of the vehicle-body-side mounting bracket, the entire outer peripheral edge of the one-way-side contact portion abuts on the vehicle-body-side mounting bracket. It is possible and suitable.

  Further, in order to equalize the distortion of the coated rubber, it is desirable that the rubber thickness in the load input direction is constant in the circumferential direction of the contact portion. Therefore, the rubber thickness in one direction of the coating rubber of the one-side contact portion can be made constant in the circumferential direction of the stopper rubber portion, and the distortion of the one-direction contact portion can be made uniform. This configuration is characterized in that the rubber thickness in the direction parallel to the load input on one side is made constant in the circumferential direction, unlike the attempt to make the rubber thickness in the radial direction of the stopper rubber portion constant in the circumferential direction. .

  In order to make the rubber thickness in the direction parallel to the load input on one side in the circumferential direction constant, for example, the outer peripheral edge of the outer peripheral flange inside the covering rubber is made substantially elliptical, and the shorter diameter side peripheral portion is formed. Is desirably a contact portion on one side. At this time, if the outer peripheral edge of the stopper rubber portion is substantially circular, the rubber thickness of the contact portion on the other direction becomes thin, but the rubber thickness in the radial direction of the coating rubber of the contact portion on one direction is set to be thick. And the ride comfort performance can be improved. The other direction is a direction perpendicular to the axis and orthogonal to one direction, and the rubber thickness in the radial direction is a rubber thickness in a direction orthogonal to the outer peripheral edge of the stopper rubber portion.

  By the way, the load in the direction perpendicular to the axis due to the running of a car or the like is often input in a certain direction. Therefore, by arranging the one direction of the stopper rubber portion and the main input direction (predominant direction) of the input load in the direction perpendicular to the axis, the durability and the riding comfort performance of the stopper rubber portion can be improved. .

  As is apparent from the above description, according to the present invention, the radius of curvature of the contact portion in one direction is made substantially the same as the inner peripheral surface of the mounting bracket on the vehicle body side, and the rubber thickness of the coating rubber in one direction is made constant. Thereby, the distortion of the coated rubber can be made uniform. As a result, when it comes into contact with the inner peripheral surface of the vehicle body-side mounting bracket, it is possible to prevent a large distortion from occurring in a part of the covering rubber, and the covering rubber can be cracked even when running on a rough road for a long time. Can be prevented from occurring.

  Hereinafter, embodiments of an engine mount according to the present invention will be described with reference to the drawings. FIG. 1 is a layout view of an engine-side mounting bracket of the engine mount of the present invention, FIG. 2A is a plan view of the engine-side mounting bracket, FIG. (S: short diameter side), and the right half indicates the other direction side (L: long diameter side).

  This engine mount is composed of a cylindrical body-side mounting bracket 1 mounted on the vehicle body side, an engine-side mounting bracket 2 mounted on the engine side, and a rubber-like elastic body interposed between the mounting brackets 1 and 2. A vibration-proof base is provided, and a steel engine-side mounting bracket 2 is disposed substantially concentrically inside a steel vehicle-body-side mounting bracket 1 at a distance from the vehicle-body-side mounting bracket 1.

  The engine-side mounting bracket 2 is formed in a substantially columnar shape having a bolt hole 3 into which an engine-side bolt is screwed at an upper end portion in the axial direction. A substantially disk-shaped stopper rubber portion 4 is provided so as to protrude in the direction perpendicular to the axis so as to oppose the direction perpendicular to the axis. The portion of the stopper rubber portion 4 that comes into contact with the vehicle-body-side mounting bracket 1 due to an input load in one direction (S) of the direction perpendicular to the axis is defined as a one-way side contact portion 4S, and one direction (S The part which comes into contact with the vehicle-body-side mounting bracket 1 due to the input load in the other direction (L) orthogonal to ()) is defined as the other-direction-side contact part 4L.

  The stopper rubber portion 4 includes an outer peripheral flange 5 formed so as to protrude from the engine-side mounting bracket in a direction perpendicular to the axis, and a covering rubber 6 covering the peripheral portion of the outer peripheral flange 5. Of these, the outer peripheral flange 5 has a substantially elliptical shape in which one direction (S) side is a short diameter side and the other direction (L) side is a long diameter side, and the one direction (S) is perpendicular to the axis. The main input direction of the input load (for example, the front-rear direction of the vehicle) is arranged. Further, a peripheral edge of the outer peripheral flange 5 on one side (S: shorter diameter side) is formed to have a radius of curvature substantially the same as the inner peripheral surface of the vehicle-body-side mounting bracket 1.

  The covering rubber 6 is made of synthetic rubber or natural rubber, and absorbs an impact force when coming into contact with the vehicle-body-side mounting bracket 1 to prevent a reduction in ride comfort performance. Among the coating rubbers 6, the coating rubber 6S of the one-side contact portion 4S has a constant rubber thickness (T0) in one direction (S: short diameter direction) in the circumferential direction, and a radius of curvature of the outer peripheral edge thereof. Are set to be substantially the same as the radius of curvature of the inner peripheral surface of the vehicle-body-side mounting bracket 1. The distance (A) in one direction (S) of each point on the outer peripheral edge of the covering rubber 6S of the one-way side contact portion 4S from the inner peripheral surface of the vehicle-body-side mounting bracket 1 is constant.

  The outer peripheral edge of the covering rubber 6 of the stopper rubber portion 4 is substantially circular, and the rubber thickness (T0) of the covering rubber 6S of the one-side contact portion 4S is equal to that of the covering rubber 6L of the other-direction contact portion 4L. It is set thicker than the rubber thickness (T1).

  According to the above configuration, the distance (A) in one direction (S) from the inner peripheral surface of the one-side contact portion 4S to the inner peripheral surface of the vehicle-body-side mounting bracket 1 is constant. The entire one-way contact portion 4 </ b> S contacts the inner peripheral surface of the vehicle-body-side mounting bracket 1. Further, when the rubber thickness of the coated rubber is made constant in the radial direction as in the related art, the rubber thickness in one direction (S) becomes thicker as the distance from the center of the one-side contact portion increases, and the distortion becomes non-uniform. However, since the rubber thickness (T0) in one direction (S) is constant, the distortion is uniform, and a large distortion does not occur only in a part of the stopper rubber portion 4, and the generation of a crack can be prevented. .

  When a load is input in the other direction (L), the other-direction contact portion 4L having a small rubber thickness of the covering rubber 6L contacts the inner peripheral surface of the vehicle-body-side mounting bracket 1. At this time, since the spring constant of the coated rubber 6L is high, the riding comfort performance is reduced, but the influence is small since the direction of the input load is not the main input direction. Also, by making the outer peripheral edge of the stopper rubber portion 4 substantially circular, the distance from the inner peripheral surface of the vehicle-body-side mounting bracket 1 to the stopper rubber portion 4 becomes substantially constant, so that the other-direction-side contact portion 4L easily contacts. Can be prevented.

  It should be noted that the present invention is not limited to the above-described embodiment, and appropriate modifications can be made within the scope of the present invention. For example, as shown in FIG. 3, the radius of curvature of the outer peripheral edge 7 of the one-way side contact portion 4 </ b> S is not only made substantially the same as the radius of curvature of the inner peripheral surface of the vehicle-body-side mounting bracket 1, but also of the virtual circle 8. If it is set to be larger than the radius of curvature, it may be smaller than the radius of curvature of the inner peripheral surface of the vehicle body-side mounting bracket 1. In this case, the one-side contact portion 4 </ b> S abuts the inner peripheral surface of the vehicle-body-side mounting bracket 1 with a wider width than that in which the outer peripheral edge 7 of the stopper rubber portion 4 is circular (virtual circle 8). An imaginary circle 8 shown by a dashed line in FIG. 3 is a circle that is inscribed in the outer peripheral edge 7 of the stopper rubber portion 4 about the axial center O of the vehicle body-side mounting bracket 1.

Arrangement diagram of the engine side mounting bracket of the engine mount of the present invention (A) is a plan view of an engine-side mounting bracket, and (b) is a cross-sectional view taken along line AA. Arrangement diagram of stopper rubber part of another embodiment Configuration diagram of conventional engine mount

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Car body side mounting bracket 2 Engine side mounting bracket 4 Stopper rubber part 4S One-way side contact part 4L The other direction side contact part 5 Outer peripheral flange 6 Coated rubber 8 Virtual circle

Claims (5)

  An engine-side mounting bracket mounted on the engine side; a vibration-isolating base made of a rubber-like elastic body interposed between the mounting brackets; An engine mount in which a substantially disc-shaped stopper rubber portion projects from the mounting bracket in a direction perpendicular to the axis and is disposed substantially concentrically with a space from the vehicle-side mounting bracket, wherein the stopper rubber portion includes the shaft The radius of curvature of a concentric virtual circle passing through one point of the outer peripheral edge of the stopper rubber portion so that the outer peripheral edge of the abutting portion on one side in the right angle direction abuts on the opposite vehicle body side mounting bracket with a wide width. An engine mount characterized in that it is set to be smaller than the radius of curvature of the inner peripheral surface of the vehicle-body-side mounting bracket.   2. The engine mount according to claim 1, wherein the stopper rubber portion has an outer peripheral edge of the contact portion on the one direction side set to be substantially the same as a radius of curvature of an inner peripheral surface of the vehicle body-side mounting bracket. 3.   The stopper rubber portion includes an outer peripheral flange formed so as to protrude from the engine-side mounting bracket in a direction perpendicular to the axis, and a covering rubber covering the peripheral portion of the outer peripheral flange. 3. The engine mount according to claim 1, wherein a rubber thickness in one direction is constant in a circumferential direction of the stopper rubber portion.   The outer peripheral edge of the outer peripheral flange is substantially elliptical, the outer peripheral edge of the covering rubber is substantially circular, and the radial thickness of the covering rubber of the one-side contact portion is one direction in a direction perpendicular to the axis. 4. The engine mount according to claim 3, wherein the thickness of the covering rubber in the abutting portion on the other side orthogonal to the radial direction is set to be thicker than the radial thickness.   The engine mount according to claim 1, wherein the one direction is a main input direction of the input load in a direction perpendicular to the axis.

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