A guide bush includes a plurality of bush elements combined to form a cylindrical shape as a whole. The plurality of bush elements includes a cylindrical fitting portion. The cylindrical fitting portion is fitted in a fit-and-hold portion of a housing, and has an inner peripheral surface configured
A guide bush includes a plurality of bush elements combined to form a cylindrical shape as a whole. The plurality of bush elements includes a cylindrical fitting portion. The cylindrical fitting portion is fitted in a fit-and-hold portion of a housing, and has an inner peripheral surface configured to guide an outer peripheral surface of a displacement shaft that has been inserted in the cylindrical fitting portion in an axially displaceable manner. The diameter of the circumscribed circle of the plurality of bush elements in a state in which the end faces of the plurality of bush elements with respect to a circumferential direction abut each other is not greater than the inside diameter of the fit-and-hold portion.
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1. A guide bush comprising a plurality of bush elements combined to form a cylindrical shape as a whole, wherein the plurality of bush elements comprises a cylindrical fitting portion configured to be fitted in a fit-and-hold portion of a housing having a cylindrical inner peripheral surface, the cy
1. A guide bush comprising a plurality of bush elements combined to form a cylindrical shape as a whole, wherein the plurality of bush elements comprises a cylindrical fitting portion configured to be fitted in a fit-and-hold portion of a housing having a cylindrical inner peripheral surface, the cylindrical fitting portion having an inner peripheral surface configured to guide an outer peripheral surface of a displacement shaft that has been inserted in the cylindrical fitting portion in an axially displaceable manner,wherein a diameter of a circumscribed circle of the plurality of bush elements in a state in which end faces of the plurality of bush elements with respect to a circumferential direction abut each other is not greater than an inside diameter of the fit-and-hold portion, andwherein a gap is provided between the end faces of the plurality of bush elements with respect to the circumferential direction in a state in which the cylindrical fitting portion is fitted in the fit-and-hold portion and the displacement shaft is inserted in the cylindrical fitting portion. 2. The guide bush according to claim 1, wherein the plurality of bush elements further comprises a flange portion provided to protrude radially outward from an axially partial outer peripheral surface of the cylindrical fitting portion and configured to engage with an engagement groove formed on the inner peripheral surface of the fit-and-hold portion, and wherein a diameter of a circumscribed circle of the flange portion in the state in which the end faces of the plurality of bush elements with respect to the circumferential direction about each other is not greater than the inside diameter of the fit-and-hold portion. 3. The guide bush according to claim 2, wherein a width L of the gap with respect to the circumferential direction is equal to or greater than (D-d)sin(π/n), wherein n is the number of the plurality of bush elements, D is the diameter of the circumscribed circle of the flange portion in a state in which the displacement shaft is inserted in the cylindrical fitting portion, and d is the inside diameter of the fit-and-hold portion. 4. The guide bush according to claim 2, further comprising a joint portion configured to couple the plurality of bush elements to each other in a state before the displacement shaft is inserted into the cylindrical fitting portion and to break or to elongate in the circumferential direction in accordance with the insertion of the displacement shaft into the cylindrical fitting portion, wherein the joint portion is provided to bridge between the end faces of the plurality of bush elements with respect to the circumferential direction, and couples, at least axially partially, the end faces with respect to the circumferential direction to each other. 5. The guide bush according to claim 4, wherein the joint portion is provided at one axial end portion of the cylindrical fitting portion, the flange portion is provided at another axial end portion of the cylindrical fitting portion,the end faces of the plurality of bush elements with respect to the circumferential direction comprise a pair of slanted face portions opposed to each other in the circumferential direction at the other axial end portion of the cylindrical fitting portion and slanting in directions separating from each other toward an axially outer side of the cylindrical fitting portion, andthe diameter of the circumscribed circle of the flange portion is not greater than the inside diameter of the fit-and-hold portion in the state before the displacement shaft is inserted into the cylindrical fitting portion and in a state in which the pair of slanted face portions are caused to abut each other or closely opposed to each other. 6. The guide bush according to claim 2, wherein the diameter of the circumscribed circle of the flange portion is not greater than the inside diameter of the fit-and-hold portion in a state before the displacement shaft is inserted into the cylindrical fitting portion. 7. The guide bush according to claim 1, further comprising an elastic ring, wherein an outer peripheral surface of the cylindrical fitting portion has a catching groove, andthe elastic ring is fitted along the catching groove. 8. A guide bush comprising: a cylindrical fitting portion configured to be fitted in a fit-and-hold portion of a housing having a cylindrical inner peripheral surface, the cylindrical fitting portion comprising an inner peripheral surface configured to guide an outer peripheral surface of a displacement shaft that has been inserted in the cylindrical fitting portion in an axially displaceable manner and a discontinuous portion at at least one location in a circumferential direction; anda joint portion provided to bridge between end faces of the cylindrical fitting portion with respect to a circumferential direction interposing the discontinuous portion and couples, at least axially partially, the end faces with respect to the circumferential direction to each other,wherein the joint portion is configured to break or to elongate in the circumferential direction in accordance with the insertion of the displacement shaft into the cylindrical fitting portion, anda width of the discontinuous portion with respect to the circumferential direction is increased by the insertion of the displacement shaft into the cylindrical fitting portion. 9. The guide bush according to claim 8, further comprising a flange portion provided to protrude radially outward from an axially partial outer peripheral surface of the cylindrical fitting portion and configured to engage with an engagement groove formed on the inner peripheral surface of the fit-and-hold portion. 10. The guide bush according to claim 9, wherein a diameter of a circumscribed circle of the flange portion is not greater than the inside diameter of the fit-and-hold portion in a state before the displacement shaft is inserted into the cylindrical fitting portion. 11. The guide bush according to claim 9, wherein the discontinuous portion is provided at a plurality of locations in the circumferential direction, and the guide bush is formed by coupling a plurality of partially cylindrical bush elements together by the joint portion in a state before the displacement shaft is inserted into the cylindrical fitting portion. 12. The guide bush according to claim 11, wherein the joint portion is provided to bridge between the end faces of the plurality of bushes with respect to the circumferential direction at an axial end portion of the cylindrical fitting portion, the flange portion is provided at another axial end portion of the cylindrical fitting portion,the end faces of the plurality of bush elements with respect to the circumferential direction comprise a pair of slanted face portions opposed to each other in the circumferential direction at the other axial end portion of the cylindrical fitting portion and slanting in directions separating from each other toward an axially outer side of the cylindrical fitting portion, anda diameter of a circumscribed circle of the flange portion is not greater than the inside diameter of the fit-and-hold portion in the state before the displacement shaft is inserted into the cylindrical fitting portion and in a state in which the pair of slanted face portions are caused to abut each other or closely opposed to each other. 13. The guide bush according to claim 8, wherein the discontinuous portion is provided only at one location in the circumferential direction. 14. A rack-and-pinion steering gear unit comprising: a housing having a fit-and-hold portion and configured to be fixed to a vehicle body;a guide bush fixed to the fit-and-hold portion, the guide bush comprising a plurality of bush elements combined to form a cylindrical shape as a whole, wherein the plurality of bush elements comprises a cylindrical fitting portion configured to be fitted in the fit-and-hold portion of the housing having a cylindrical inner peripheral surface, the cylindrical fitting portion having an inner peripheral surface configured to guide an outer peripheral surface of a displacement shaft that has been inserted in the cylindrical fitting portion in an axially displaceable manner, wherein a diameter of a circumscribed circle of the plurality of bush elements in a state in which end faces of the plurality of bush elements with respect to a circumferential direction abut each other is not greater than an inside diameter of the fit-and-hold portion, and wherein a gap is provided between the end faces of the plurality of bush elements with respect to the circumferential direction in a state in which the cylindrical fitting portion is fitted in the fit-and-hold portion and the displacement shaft is inserted in the cylindrical fitting portion;a rack shaft having a front face on which rack teeth are formed axially partially, and supported inside the housing in a state of being inserted in the guide bush;a pinion shaft having an outer peripheral surface on which pinion teeth are formed axially partially, and rotatably supported inside the housing in a state in which the pinion teeth are meshed with the rack teeth; andpressing means comprising a pressing member and provided inside the housing in a state in which the pressing member elastically presses a portion of a back face of the rack shaft opposite to the pinion shaft across the rack shaft,wherein with respect to an axial direction of the rack shaft, the fit-and-hold portion is provided at at least one end portion of the housing, the one end portion being farther from the pinion shaft than another end portion of the housing, andan outer peripheral surface of the rack shaft is supported inside the housing in a state of being guided by the inner peripheral surface of the guide bush in the axially displaceable manner.
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이 특허에 인용된 특허 (17)
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