Elastic bush and method of press-fitting elastic bush

A resilient bush used to, by fitting into a support hole formed in the article to be supported, resiliently support the article, comprising:

• an inner sleeve;
• a resilient body having a tubular portion that directly contacts the inside face of the support hole and is formed with leg portions fixed to the inner sleeve at the inner circumference of an intermediate portion in an axial direction of the tubular portion;
• and
• an inserted sleeve embedded in the tubular portion of the resilient body,
• characterized in that
• flanges bent in a diametrically outwards direction are formed at both ends of the inserted sleeve, the flanges at both ends extending in the diametrically outwards direction from a projection plane in the axial direction of the support hole in a condition in which the resilient bush is fitted into the support hole;
• and
• a notch extending in a tubular portion of the inserted sleeve is formed in at least part, in a circumferential direction, of the flange at one end such that the flange at one end is capable of being reduced in diameter, the flanges at one end being one of the flanges at both ends which is positioned at the leading end of the resilient bush in the direction of insertion of same with respect to the support hole and in that
• a diametrical stopper portion is provided on one of the inner sleeve and the tubular portion of the resilient body that restricts reduction in diameter by abutting the other of the inner sleeve and the tubular portion of the resilient body when the flange at one end is reduced in diameter.

A resilient bush used to, by fitting into a support hole formed in an article to be supported, resiliently support the article to be supported, comprising:

• an inner sleeve;
• a resilient body having a tubular portion that directly contacts the inside face of the support hole and is formed with leg portions fixed to the inner sleeve at the inner circumference of an intermediate portion in an axial direction of the tubular portion;
• and
• an inserted sleeve, embedded in the tubular portion of the resilient body,
• characterized in that
• flanges bent in a diametrically outwards direction are formed at both ends of the inserted sleeve, the flanges at both ends extending in the diametrically outwards direction from a projection plane in the axial direction of the support hole in a condition in which the resilient bush is fitted into the support hole;
• and
• a notch extending in a tubular portion of the inserted sleeve are formed in at least part, in a circumferential direction, of the flange at one end such that the flange at one end is capable of being reduced in diameter, the flange at one end being one of the flanges at both ends which is positioned at the leading end of the resilient bush in the direction of insertion of same with respect to the support hole, and in that
• a split groove in the same phase as said notch and that reaches the end face at the leading end in said direction of insertion are formed in the tubular portion of the resilient body, a wedge member being provided that fit into the split groove.

A method of pressure-insertion, into a support hole, of a resilient bush used to, by fitting into a support hole formed in an article to be supported, resiliently support the article, the resilient bush comprising:

• an inner sleeve;
• a resilient body that directly contacts the inside face of the support hole and is fixed to the outer circumference of the inner sleeve;
• and
• an inserted sleeve embedded in a diametrically intermediate part of the resilient body, in which flanges are formed at both ends of the inserted sleeve, extending in an diametrically outwards direction from a projection plane in an axial direction of the support hole in a condition in which the resilient bush is fitted into the support hole;
• and a notch extending in a tubular portion of the inserted sleeve is formed in at least part, in a circumferential direction, of the flange at one end such that the flange at one end is capable of being reduced in diameter, the flange at one end being one of the flanges at both ends which is positioned at the leading end of the resilient bush in a direction of pressure-insertion of same with respect to the support hole,
• characterized in that
• an annular diameter reduction guide, whose internal diameter reduces with approach to the support hole, is arranged at an aperture face on an inlet side of the support hole of the article to be supported, and said flange at one end of the inserted sleeve is arranged to be guided into the support hole by diameter reduction performed by pressing the flange into the diameter reduction guide;
• and
• the diameter reduction guide is constituted by a plurality of segments that can be opened and closed in the diametrical direction, these segments being opened in the diametrical direction after pressure-insertion of the resilient bush.

A method of pressure-insertion, into a support hole, of a resilient bush used to, by fitting into a support hole formed in an article to be supported, resiliently support the article, the resilient bush comprising:

• an inner sleeve;
• a resilient body that directly contacts the inside face of the support hole and is fixed to the outer circumference of the inner sleeve;
• and
• an inserted sleeve embedded in a diametrically intermediate part of the resilient body, in which flanges are formed at both ends of the inserted sleeve, extending in a diametrically outwards direction from a projection plane in an axial direction of the support hole in a condition in which the resilient bush is fitted into the support hole;
• and a notch extending in a tubular portion of the inserted sleeve is formed in at least part, in a circumferential direction, of the flange at one end such that the flange at one end is capable of being reduced in diameter, the flange at one end being one of the flanges at both ends which is positioned at the leading end of the resilient bush in the direction of pressure-insertion of same with respect to the support hole,
• characterized in that
• an annular diameter reduction guide is arranged at an aperture face on the inlet side of the support hole of the article to be supported, guide projections, the amount of whose projection diametrically inwards increases with approach to the support hole, being provided at a plurality of locations in the circumferential direction of the inner circumference of the diameter reduction guide, said flange at one end of the inserted sleeve being arranged to be guided into the support hole by diameter reduction performed by the guide projections by pressing the flange into the diameter reduction guide;
• and
• recesses are formed at a plurality of locations in the circumferential direction in the same phase as the guide projections in the flange at the other end of the inserted sleeve, the diameter reduction guide being arranged to be separated in the axial direction such that the guide projections pass through the recesses after pressure-insertion of the resilient bush.

A method of pressure-insertion, into a support hole, of a resilient bush used to, by fitting into a support hole formed in the article to be supported, resiliently support the article, the resilient bush comprising:

• an inner sleeve;
• a resilient body that directly contacts the inside face of the support hole and is fixed to the outer circumference of the inner sleeve;
• and
• an inserted sleeve embedded in a diametrically intermediate part of the resilient body, in which flanges are formed at both ends of the inserted sleeve, extending in a diametrically outwards direction from a projection plane in an axial direction of the support hole in a condition in which the resilient bush is fitted into the support hole;
• and a notch extending in a tubular portion of the inserted sleeve is formed in at least part, in a circumferential direction, of the flange at one end such that the flange at one end is capable of being reduced in diameter, the flange at one end being one of the flanges at both ends, positioned at the leading end of the resilient bush in a direction of pressure-insertion of same with respect to the support hole,
• characterized in that
• a practically U-shaped diameter reduction guide is arranged at an aperture face on the inlet side of the support hole of the article to be supported, whose internal diameter decreases as the support hole is approached and which opens on one side in the diametrical direction matching said notch, guidance into the support hole being effected by diameter reduction of said flange at one end of the inserted sleeve by pressing the flange into the diameter reduction guide and;
• the diameter reduction guide being arranged to be separated in the direction opposite to the direction of opening of this guide after pressure-insertion of the resilient bush.

A method of pressure-insertion, into a support hole, of a resilient bush used to, by fitting into a support hole formed in an article to be supported, resiliently support the article to be supported, the resilient bush comprising:

• an inner sleeve;
• a resilient body that directly contacts the inside face of the support hole and is fixed to the outer circumference of the inner sleeve;
• and
• an inserted sleeve embedded in a diametrically intermediate part of the resilient body, in which flanges are formed at both ends of the inserted sleeve, extending in a diametrically outwards direction from a projection plane in an axial direction of the support hole in a condition in which the resilient bush is fitted into the support hole;
• and a notch extending in a tubular portion of the sleeve insert is formed in at least part, in a circumferential direction, of the flange at one end such that the flange at one end is of the flange at one end such that the flange at one end is capable of being reduced in diameter, the flange at one end being one of the flanges at both ends which is positioned at the leading end of the resilient bush in the direction of pressure-insertion of same with respect to the support hole,
• characterized in that
• the aperture face on the outlet side of the support hole of the article to be supported is contacted to a fixing jig so as to receive the pressure-insertion load of the resilient bush
• a concavity being formed in the fixing jig that receives said flange, at one end of the inserted sleeve, when this is extruded from the outlet of the support hole on completion of pressure-insertion of the resilient bush, this concavity being formed in elliptical shape whose long-diameter direction is a direction parallel with the width direction of said notch.