JP5541010B2 - Synthetic resin ball sheet and ball joint using the same - Google Patents

Description

  The present invention relates to a ball seat made of a synthetic resin that is housed in a socket and slidably supports a ball portion of a ball stud, and a ball joint using the same.

JP 2006-292094 A JP 2008-164126 A

  For example, in a ball joint used for a suspension device or a steering device of an automobile, a ball portion of a ball stud is conventionally rotatably accommodated in a socket, and the ball portion smoothly rotates with respect to the socket. For this purpose, a synthetic resin ball sheet called a sheet bearing is interposed between the inner surface of the socket and the spherical outer surface of the ball portion.

  By the way, in the ball joint, in order to prevent the ball portion from coming out of the opening of the ball seat in which the ball stud extends, the outer surface of the ball portion is left as it is to reduce the diameter of the cylindrical portion on the opening side through which the ball stud of the ball seat passes. If the cylindrical portion is deformed into a spherical band and reduced in diameter following the above, a large internal stress is generated in the reduced-side opening-side spherical band portion, and this internal stress causes a significant decrease in strength, resulting in a reduction in diameter to receive a high load. On the other hand, the load side of the spherical part on the open side is significantly deteriorated and the durability may be lowered. On the other hand, the diameter of the open side is reduced by facilitating the deformation of the cylindrical part on the open side through which the ball stud of the ball seat passes. If a slit (notch) is formed in the cylindrical portion of the ball seat on the opening side in order to avoid the occurrence of such a large internal stress in the spherical belt-shaped portion, the pressure receiving area is reduced. The loadability is reduced, it becomes susceptible to creep deformation under high load, and the spherical zone near the slit plastically flows into the slit, resulting in non-uniform shape of the spherical zone and unstable sliding torque. Or, due to the occurrence of abnormal wear, there is a risk that rattling between the spherical outer surface of the ball portion of the ball stud and the inner surface of the ball seat will increase.

  The present invention has been made in view of the above-mentioned points, and the object of the present invention is to reduce the load resistance without causing a large internal stress in the ball-shaped portion on the opening side through which the stud portion of the ball stud passes. The ball-shaped part on the opening side through which the ball stud passes by preventing the deterioration of the durability and preventing creep deformation of the synthetic resin on the ball-shaped part on the opening side through which the ball stud passes due to the pulling of the ball stud by providing the slit It is an object of the present invention to provide a synthetic resin ball sheet and a ball joint using the same, which can prevent deformation and maintain uniform sliding torque and prevent rattling.

  The ball seat made of the synthetic resin of the present invention has a sheet base portion having a first spherical inner surface, is adjacent to the sheet base portion in the axial direction, and is disposed corresponding to the cylindrical inner surface and the cylindrical inner surface. A cylindrical portion having a cylindrical outer surface, and the circumferential width is gradually reduced from the annular end surface of the cylindrical portion toward the spherical center of the first spherical inner surface in the axial direction. A ball seat made of a synthetic resin having a wedge-shaped slit portion that extends while having a slit formed in a cylindrical portion, the wedge-shaped slit portion being a ball portion of a ball stud accommodated in the ball seat. It has a circumferential width corresponding to the amount of deformation in the circumferential direction of the cylindrical portion that occurs in the deformation of the cylindrical inner surface into the second spherical belt-shaped inner surface that contacts the spherical outer surface.

  Further, the synthetic resin ball sheet of the present invention corresponds to the first spherical inner surface, the cylindrical inner surface adjacent to the large diameter end of the first spherical inner surface in the axial direction, and the cylindrical inner surface. A cylindrical outer surface arranged in an annular manner, an annular end surface connected to the cylindrical outer surface, and gradually from the annular end surface toward the spherical center of the first spherical inner surface in the axial direction toward the spherical center. A synthetic resin ball sheet having a slit having a wedge-shaped slit portion extending while reducing a width in the circumferential direction, the wedge-shaped slit portion being a ball portion of a ball stud accommodated in the ball sheet. It has a circumferential width corresponding to the amount of deformation in the circumferential direction of the cylindrical inner surface that occurs in the deformation of the cylindrical inner surface into the second spherical belt-shaped inner surface that contacts the spherical outer surface.

  According to the ball seat made of the synthetic resin of the present invention, the circumference of the cylindrical portion generated in the deformation of the cylindrical inner surface to the second spherical belt-like inner surface contacting the spherical outer surface of the ball portion of the ball stud accommodated in the ball seat Since the wedge-shaped slit portion has a circumferential width corresponding to the amount of deformation in the direction, in other words, to the second spherical belt-shaped inner surface that contacts the spherical outer surface of the ball portion of the ball stud accommodated therein Since the wedge-shaped slit portion has a circumferential width corresponding to the amount of deformation in the circumferential direction of the cylindrical inner surface that occurs in the deformation of the cylindrical inner surface, the cylindrical inner surface contacts the spherical outer surface of the ball portion. In this way, even if the ball sheet is disposed in the socket of the ball joint by being deformed to the second spherical inner surface, the deformation can be absorbed by the wedge-shaped slit portion, and as a result, the second diameter obtained by reducing the diameter is obtained. Spherical inner surface Without causing a large internal stress in the ball-shaped portion on the opening side through which the ball stud of the ball seat has, the load resistance and durability can be prevented, and the circumferential width of the wedge-shaped slit portion can be prevented. A pair of opposing end faces facing each other in the circumferential direction of the ball sheet that defines the wedge-shaped slit portion as zero contact each other, and as a result, the creep deformation of the synthetic resin in the circumferential direction of the ball-shaped portion caused by pulling the ball stud contacts each other This can be prevented by pressing the pair of opposing end faces, and the maintenance of uniform sliding torque and rattling can be prevented.

  In the present invention, the cylindrical portion defined by the cylindrical inner surface and the cylindrical outer surface does not need to have the same diameter, and for example, the diameter may be reduced toward the annular end surface on the wedge-shaped slit portion side, The number of slits may be one, but preferably a plurality of slits may be spaced apart from each other in the circumferential direction. In addition, the circumferential width of the wedge-shaped slit portion may be the circumferential direction of the cylindrical portion. The same amount of deformation, in other words, the same amount of deformation in the circumferential direction of the cylindrical inner surface, and a pair of opposed end faces facing each other in the circumferential direction of the ball sheet defining the wedge-shaped slit portion are in the vicinity of the opposed end face. The ball strips on the one opening side of the ball sheet may have such lengths that they simply contact each other without causing internal stress, and instead, the amount of deformation in the circumferential direction of the cylindrical portion is slightly Small, in other words The degree of deformation in the circumferential direction of the cylindrical inner surface is slightly smaller and the pair of opposing end faces facing each other in the circumferential direction of the ball sheet that defines the wedge-shaped slit portion do not cause a decrease in load resistance and durability The internal stresses of the ball sheet may be of such a length that they are pressed against each other so as to be generated in the ball-shaped portion on one opening side of the ball sheet in the vicinity of the opposing end surface.

  In a preferred example of improving the durability of the mold, the slit has a width in the circumferential direction from one end of the wedge-shaped slit portion having the smallest circumferential width toward the sphere center of the first spherical inner surface in the axial direction. Are further provided with slits of the same width extending in the same manner.

  Such a slit having the same width preferably extends to the sphere center of the first inner surface in the axial direction, but instead, does not reach the sphere center of the first inner surface in the axial direction. Furthermore, it may extend to the front of the sphere center of the first inner surface in the axial direction in the axial direction.

  The slit extends in the axial direction from one end of the wedge-shaped slit portion toward the spherical center of the first inner surface of the first zonal belt, while the wedge angle is a wedge-shaped slit instead of the same-width slit portion. You may have a small wedge-shaped slit part smaller than this.

  In a preferred example, the pair of opposing end faces facing each other in the circumferential direction that define the wedge-shaped slit portion gradually move from the annular end face toward the sphere center of the first spherical inner surface in the axial direction toward the sphere center. It stretches close. The distance between the pair of opposed end faces that define such a wedge-shaped slit portion is shortened from the cylindrical outer surface toward the cylindrical inner surface.

  A pair of opposed end faces facing each other in the circumferential direction that define the wedge-shaped slit portion are in contact with each other by deformation of the cylindrical inner surface into a second spherical inner surface that contacts the spherical outer surface of the ball portion accommodated in the ball seat. It is good to come to do.

  The ball seat of the present invention may further have a ball-like groove for accommodating a lubricant disposed between the first ball-like inner surface and the cylindrical inner surface in the axial direction.

  The ball seat of the present invention may further include a step portion formed on the cylindrical inner surface along a pair of opposed end faces facing each other in the circumferential direction defining the wedge-shaped slit portion. When the pair of opposed end surfaces are brought into contact with each other, it is preferable that the axial groove for accommodating the lubricant is formed in cooperation with each other.

  Further, in the ball seat according to the present invention, the step portion includes an axial groove for accommodating the lubricant that communicates with the spherical groove for accommodating the lubricant in cooperation with each other when the pair of opposed end surfaces are in contact with each other. May be formed.

  Preferred synthetic resins for forming the ball sheet of the present invention include polyamide resins, polyarylate resins, polyacetal resins, polyolefin resins, polyurethane elastomer resins, polyether ketone resins, and polyester elastomer resins. it can.

  The ball joint of the present invention has a socket having a cylindrical inner surface and a spherical inner surface connected to the cylindrical inner surface in the axial direction, a cylindrical outer surface in contact with the cylindrical inner surface of the socket, and a spherical shape of the socket. A synthetic resin ball sheet for the ball joint having a spherical outer surface that contacts the inner surface, and a second spherical inner surface deformed following the first spherical inner surface of the ball sheet and the spherical inner surface of the socket A ball stud having a spherical outer surface that contacts each of the ball studs and having a ball portion disposed in the ball seat, and the spherical outer surface of the ball sheet corresponds to the cylindrical inner surface of the ball sheet. The cylindrical outer surface of the ball sheet is deformed to follow the inner surface of the socket and is formed in the circumferential direction defining the wedge-shaped slit portion of the ball sheet. A pair of opposed end faces facing Te are in contact with each other.

  According to the present invention, it is possible to prevent a decrease in load resistance and a decrease in durability without causing a large internal stress in a spherical band-like portion on the opening side through which the stud portion of the ball stud passes. By preventing the plastic deformation of the synthetic resin at the opening side through which the ball studs pass due to pulling as much as possible, deformation of the spherical part at the opening side through which the ball studs pass is prevented, maintaining uniform sliding torque and rattling. It is possible to provide a synthetic resin ball sheet and a ball joint using the same.

FIG. 1 is a cross-sectional explanatory diagram of a preferred example of an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional explanatory view of the ball seat of the example shown in FIG. FIG. 3 is a front explanatory view of the ball seat of the example shown in FIG. FIG. 4 is an explanatory plan view of the ball seat of the example shown in FIG. FIG. 5 is an explanatory plan view before mounting the ball seat of the example shown in FIG. 1 to the socket. 6 is a cross-sectional explanatory view taken along the line VI-VI of the socket shown in FIG. FIG. 7 is a partially enlarged explanatory view of the socket shown in FIG. FIG. 8 is an explanatory plan view of another preferred example of the embodiment of the present invention. FIG. 9 is a partially enlarged explanatory view of the example shown in FIG. 10 is a cross-sectional explanatory view taken along line XX shown in FIG. 11 after being mounted on the socket of the example shown in FIG. FIG. 11 is an explanatory plan view of the example shown in FIG. 8 after being mounted on the socket. FIG. 12 is a cross-sectional explanatory view of another preferable example of the embodiment of the present invention. FIG. 13 is an explanatory cross-sectional view of another preferred example of an embodiment of the present invention. FIG. 14 is a cross-sectional explanatory view of another preferable example of the embodiment of the present invention. FIG. 15 is a cross-sectional explanatory view of another preferable example of the embodiment of the present invention. FIG. 16 is a cross-sectional explanatory view of another preferable example of the embodiment of the present invention.

  Next, the present invention will be described in more detail based on an example of a preferred embodiment shown in the drawings. The present invention is not limited to these examples.

  1 to 4, a ball joint 1 of this example includes a cylindrical inner surface 2, a socket 4 having a spherical inner surface 3 connected to the cylindrical inner surface 2 in the axial direction A, and a cylindrical inner surface 2 of the socket 4. A synthetic resin ball sheet 7 having a spherical outer surface 6 in contact with the cylindrical outer surface 5 and the spherical inner surface 3 of the socket 4, and having a spherical outer surface 6 in contact with the spherical inner surface 3. Each of the spherical inner surfaces 10 in which the cylindrical inner surface 9 (see FIG. 6) of the ball sheet 7 is deformed along with the following deformation of the spherical outer surface 6 of the ball sheet 7 according to the spherical inner surface 8 and the spherical inner surface 3 of the socket 4. A ball stud 13 having a ball portion 12 having a spherical outer surface 11 in contact with the ball 4 and disposed in the socket 4, and a closing disc 14 for preventing the ball seat 7 from coming out of the socket 4. That.

  A rigid metal socket 4 having annular end faces 21 and 22 in the axial direction A is provided between the end face 22 and the spherical inner face 3 in addition to the cylindrical inner face 2 and the spherical inner face 3. An annular tapered surface 23 that is connected to the inner surface 3 and has a diameter that increases from the spherical inner surface 3 toward the end surface 22, and an annular shape that is formed on the cylindrical inner surface 2 adjacent to the end surface 21 in the axial direction A. And a space 25 in the socket 4 for accommodating the ball seat 7 is formed by the cylindrical inner surface 2, the spherical inner surface 3, and the tapered surface 23. The space 25 is cylindrical. The inner surface 2 communicates with the outside of the socket 4 through openings 26 and 27 defined by one end portion in the axial direction A and the tapered surface 23.

  In addition to the ball portion 12, the ball stud 13 is integrally formed with the ball portion 12 on the opening 27 side at one end and a stud portion 32 having a screw portion 31 for attachment at the other end. The ball portion 12 is supported so as to be swingable with respect to the socket 4 around the ball center O of the ball portion 12 via the ball seat 7.

  The closed disc 14 fitted in the recess 24 of the socket 4 at the annular outer peripheral end 35 closes the opening 26 of the socket 4 to prevent the ball seat 7 from coming out of the space 25 through the opening 26. In addition, the spherical outer surface 6 is pressed against the spherical inner surface 3 so that no gap is generated between the spherical outer surface 6 of the ball sheet 7 and the spherical inner surface 3 of the socket 4.

  Before the deformation to the spherical outer surface 6 and the spherical inner surface 10, the ball seat 7 basically has a sheet base 36 having a spherical inner surface 8 and a seat base 36 as shown in FIGS. A cylindrical portion 71 having a cylindrical inner surface 9 and a cylindrical outer surface 47 arranged corresponding to the cylindrical inner surface 9 and a plurality of slits 51 formed in the cylindrical portion 71 are integrally formed adjacently. More specifically, the ball sheet 7 before being deformed into the spherical outer surface 6 and the spherical inner surface 10 has one annular end surface 41 in the axial direction A and an annular end surface 41 having an annular shape. A cylindrical inner surface 43 connected to the inner peripheral end and defining one opening 42, a spherical inner surface 8 connected to the cylindrical inner surface 43 at an annular small-diameter end, and a large annular shape of the spherical inner surface 8 In the axial direction A with a ball-shaped groove 44 for accommodating the lubricant in the radial end. A cylindrical inner surface 9 provided adjacent to the cylindrical inner surface 9 and a tapered inner surface 46 which is adjacent to the cylindrical inner surface 9 in the axial direction A and defines the other opening 45 and which has a diameter increased from the cylindrical inner surface 9 in the axial direction A. A cylindrical outer surface 47 disposed corresponding to the tapered inner surface 46 and the cylindrical inner surface 9, the other annular end surface 48 in the axial direction A connected to each of the cylindrical outer surface 47 and the tapered inner surface 46, and a cylindrical shape A cylindrical outer surface 5 continuously extending from the outer surface 47 toward the annular end surface 41, and disposed between the cylindrical outer surface 5 and the annular end surface 41, and from the cylindrical outer surface 5 toward the annular end surface 41. The taper outer surface 49 having a reduced diameter and the circumferential direction R gradually toward the spherical center O of the ball portion 12 that is also the spherical center of the spherical inner surface 8 in the axial direction A from the annular end surface 48. The width of the However, each of the slits 50 has a wedge-shaped slit portion 50 that extends while being spaced apart from each other in the circumferential direction R. In this example, the slits 50 are spaced apart from each other at an angular interval of 90 degrees in the circumferential direction R. The four slits 51 are provided.

  In addition to the wedge-shaped slit portion 50, each slit 51 has the same width in the circumferential direction R from one end of the wedge-shaped slit portion 50 having the smallest width in the circumferential direction R toward the spherical center O in the axial direction A. A slit 52 having the same width extending to the spherical center O is further provided.

  A pair of opposing end surfaces 61 and 62 facing each other in the circumferential direction R defining each wedge-shaped slit portion 50 are directed from the annular end surface 48 toward the spherical center O of the spherical inner surface 8 toward the spherical center O in the axial direction A. The pair of opposed end faces 63 and 64 that face each other in the circumferential direction R that defines the same width slit portions 52 are axially extended from one end of the corresponding pair of opposed end faces 61 and 62. In A, it extends in parallel to the spherical center O of the spherical inner surface 8.

  The opposing end surfaces 61 and 62 of each pair are accommodated in a space 65 in the ball sheet 7 defined by the spherical belt-shaped inner surface 8, the spherical belt-shaped groove 44, the cylindrical inner surface 9 and the tapered inner surface 46 shown in FIGS. The cylindrical inner surface 9 shown in FIGS. 1 to 4 is brought into contact with the spherical outer surface 11 of the ball portion 12 so as to come into contact with each other. Similarly, each pair of end surfaces 63 and 64 are in contact with each other. Are in contact with each other by deformation of the cylindrical inner surface 9 into the spherical inner surface 10 so as to be in contact with the spherical outer surface 11 of the ball portion 12 accommodated in the space 65, and thus each wedge-shaped slit portion 50. Is the circumferential direction R corresponding to the amount of deformation in the circumferential direction R of the cylindrical inner surface 9 that occurs in the deformation of the cylindrical inner surface 9 to the spherical inner surface 10 that contacts the spherical outer surface 11 of the ball portion 12 accommodated in the space 65. Having a width d of d decreases from the cylindrical outer surface 47 toward the cylindrical inner surface 9 due to the difference in deformation amount in the circumferential direction R between the cylindrical inner surface 9 and the cylindrical outer surface 47, that is, the opposed end surfaces 61 and 62. The distance between them and the distance between the end faces 63 and 64 are shortened from the cylindrical outer surface 47 toward the cylindrical inner surface 9 based on the difference in deformation amount in the circumferential direction R.

  Therefore, the ball-shaped outer surface 6 of the ball sheet 7 formed by deforming the cylindrical outer surface 47 of the ball sheet 7 arranged corresponding to the cylindrical inner surface 9 of the ball sheet 7 following the ball-shaped inner surface 3 of the socket 4. In the ball joint 1 shown in FIGS. 1 to 4 having the above, a pair of opposed end faces 61 and 62 facing each other in the circumferential direction R defining the wedge-shaped slit portion 50 of each slit 51 of the ball seat 7 are in contact with each other. The pair of end faces 63 and 64 facing each other in the circumferential direction R defining the same width slit portion 52 of each slit 51 of the ball sheet 7 face each other with a tear-like gap.

  The ball joint 1 described above includes, for example, a ball portion 12 accommodated in a space 65 of the ball seat 7 shown in FIGS. 5 to 7 integrally formed using a mold or the like, and the ball seat 7 containing the ball portion 12 is accommodated. The cylindrical portion with the slit 51 of the ball seat 7 having the cylindrical inner surface 9, the tapered inner surface 46, the annular end surface 48 and the cylindrical outer surface 47 by press-fitting into the space 25 of the socket 4 from the opening 26 with the screw portion 31 as the leading end. 71 is made to follow the spherical inner surface 3 of the socket 4 and the spherical outer surface 11 of the ball portion 12 by utilizing the plasticity of the ball sheet 7 made of synthetic resin, and the spherical inner surface 10, the tapered inner surface 46, the annular end surface 48, and the like. It can be manufactured by deforming into a sphere-like portion 72 having a sphere-like outer surface 6 and fitting the closed disc 14 in the recess 24 after this press-fitting.

  According to the ball sheet 7 made of such a synthetic resin, the cylindrical inner surface 9 is deformed to the spherical inner surface 10 that contacts the spherical outer surface 11 of the ball portion 12 of the ball stud 13 accommodated in the space 65 that is inside. Since each wedge-shaped slit portion 50 has a width d in the circumferential direction R corresponding to the amount of deformation in the circumferential direction R of the cylindrical inner surface 9, the cylindrical inner surface 9 contacts the spherical outer surface 11 of the ball portion 12. As described above, even when the ball seat 7 is disposed in the space 25 in the socket 4 of the ball joint 1 after being deformed into the spherical inner surface 10, such a deformation can be absorbed by each wedge-shaped slit portion 50, thereby reducing the diameter. Without causing a large internal stress in the ball-shaped portion 72 on the opening 45 side of the ball sheet 7 having the ball-shaped inner surface 10 obtained in this way, it is possible to prevent a decrease in load resistance and a decrease in durability, and each wedge. As a result of the contact between the pair of opposed end surfaces 61 and 62 facing each other in the circumferential direction R of the ball sheet 7 defining each wedge-shaped slit portion 50 with the width of the slit portion 50 in the circumferential direction R being zero, the ball stud 13 Creep deformation of the synthetic resin in the circumferential direction R of the sphere-shaped portion 72 due to the pulling of the ball can be prevented by pressing the pair of opposed end faces 61 and 62 that are in contact with each other, so that uniform sliding torque can be maintained and rattling can be prevented. .

  By the way, in the ball seat 7 described above, the ball-shaped groove 44 for accommodating the lubricant is provided between the ball-shaped inner surface 8 and the cylindrical inner surface 9 in the axial direction A. As shown in FIGS. One end portion communicates with the spherical groove 44 and the other end portion includes a tapered inner surface 46 or a tapered inner surface 46 and an annular end surface 48. In this example, an axial groove 81 for containing a lubricant that opens at the tapered inner surface 46 is formed. The taper inner surface 46 and the ball-shaped inner surface 10 may be provided so as to be spaced apart from each other by 90 degrees in the circumferential direction R. In this case, as shown in FIGS. 8 and 9, in the ball sheet 7 before being deformed into the spherical outer surface 6 and the spherical inner surface 10, in the circumferential direction defining each wedge-shaped slit portion 50 and the same width slit portion 52. Step portions 82 and 83 are formed on the tapered outer surface 46 and the cylindrical inner surface 9 along a pair of opposed end surfaces 61 and 62 and 63 and 64 that face each other, and the pair of opposite end surfaces 61 and 62 are mutually connected by the step portions 82 and 83. When contacted, the lubricant containing axial groove 81 communicating with the lubricant containing spherical belt groove 44 may be formed.

  Further, in the present invention, the step portions 82 and 83 forming the axial groove 81 are provided on the tapered inner surface 46 and the cylindrical inner surface 9 and, as shown in FIG. 12, one end communicates with the spherical groove 44 and the other end Then, an axial groove 91 for accommodating a lubricant communicating with the opening 42 may be provided in the spherical inner surface 8. Further, instead of the axial grooves 81 and 91, as shown in FIG. 13 and FIG. A plurality of circular or elliptical grooves 92 and 93 for containing the agent may be provided on the spherical inner surface 8 and the cylindrical inner surface 9 in the circumferential direction R with a plurality of steps in the axial direction A at equal angular intervals, In this case, as shown in FIG. 14, the circular grooves 92 and the circular grooves 93 may be arranged in a staggered manner with respect to the circumferential direction R or the axial direction A.

  In the ball seat 7 described above, the seat base portion 36 and the cylindrical portion 71 are integrally formed. Instead, as shown in FIGS. 15 and 16, the seat base portion 36 and the cylindrical portion 71 are separated from each other. In the ball sheet 7 of the present invention shown in FIG. 15, the sheet base portion 36 is fitted in the thick cylindrical portion 95 of the cylindrical portion 71, while the thick cylindrical portion 95 is A thin cylindrical portion 96 of the integral cylindrical portion 71 is disposed adjacent to the seat base 36 in the axial direction A, and the ball seat 7 of the present invention shown in FIG. The section 71 is arranged adjacent to and arranged in the axial direction A, and in any case, as shown in FIGS. 15 and 16, the spherical inner surface 8 of the seat base 36 has an axial direction for containing the lubricant. At least one groove 98 It may form.

DESCRIPTION OF SYMBOLS 1 Ball joint 2 Cylindrical inner surface 3, 8, 10 Spherical inner surface 4 Socket 5 Cylindrical outer surface 6 Spherical outer surface 7 Ball seat 9 Cylindrical inner surface 11 Spherical outer surface 12 Ball part 13 Ball stud 14 Closing disc

Claims (8)

A sheet base portion having a first spherical inner surface, a cylindrical portion adjacent to the sheet base portion in the axial direction and having a cylindrical inner surface and a cylindrical outer surface corresponding to the cylindrical inner surface; and From the annular end surface of the cylindrical portion toward the sphere center of the first inner surface in the axial direction in the axial direction, each has a wedge-shaped slit portion extending while gradually reducing the width in the circumferential direction toward the sphere center. ball a synthetic resin ball seat provided with the plurality of slits formed in the cylindrical portion is disposed apart from each other in the circumferential direction, each of the wedge-shaped slit portion may be housed in the ball seat with there A circumferential width corresponding to a circumferential deformation amount of the cylindrical portion generated in the deformation of the cylindrical inner surface to the second spherical belt-shaped inner surface contacting the spherical outer surface of the ball portion of the stud, and a plurality of widths Slit S has the same width slit portion extending in the width in the circumferential direction in the same toward the spherical center of the one end of each of the wedge-shaped slits in the axial direction in which the width in the circumferential direction is minimized further ball Synthetic resin ball sheet for joints. A first spherical inner surface, a cylindrical inner surface adjacent to the large diameter end of the first spherical inner surface in the axial direction, a cylindrical outer surface corresponding to the cylindrical inner surface, and a cylindrical outer surface An annular end surface that is connected, and a wedge-shaped slit portion that extends from the annular end surface toward the center of the first inner surface in the axial direction in the axial direction while gradually reducing the width in the circumferential direction toward the center. Each having a plurality of slits spaced apart from each other in the circumferential direction, each of the wedge-shaped slit portions of the ball stud accommodated in the ball seat A circumferential width corresponding to the amount of deformation in the circumferential direction of the cylindrical inner surface that occurs in the deformation of the cylindrical inner surface into the second spherical belt-shaped inner surface that contacts the spherical outer surface of the ball portion ; Each of the slits is circumferential Plastic balls but the ball-joint which has the same width slit portion extending in the width in the circumferential direction in the same direction from one end of each of the wedge-shaped slit portion to be minimized spherical center in the axial direction yet Sheet. The pair of opposed end faces that confront each other in the circumferential direction that define the wedge-shaped slit portion gradually approach each other toward the sphere center of the first spherical inner surface in the axial direction from the annular end face. The ball sheet made of a synthetic resin for a ball joint according to claim 1 or 2, which is extended. A pair of opposed end faces facing each other in the circumferential direction that define the wedge-shaped slit portion are in contact with each other by deformation of the cylindrical inner surface into a second spherical inner surface that contacts the spherical outer surface of the ball portion accommodated in the ball seat. The ball sheet made of a synthetic resin for a ball joint according to any one of claims 1 to 3, wherein the ball sheet is made of a synthetic resin. 5. The ball joint according to claim 1, further comprising a spherical groove for accommodating a lubricant disposed between the first spherical inner surface and the cylindrical inner surface in the axial direction. Ball sheet made of synthetic resin. In the case where a pair of opposed end faces are formed in the cylindrical inner surface along a pair of opposed end faces facing each other in the circumferential direction defining the wedge-shaped slit part, the pair of opposed end faces are in contact with each other. The ball seat made of a synthetic resin for a ball joint according to any one of claims 1 to 5, wherein an axial groove for accommodating a lubricant is formed in cooperation with each other. In the case where a pair of opposed end faces are formed in the cylindrical inner surface along a pair of opposed end faces facing each other in the circumferential direction defining the wedge-shaped slit part, the pair of opposed end faces are in contact with each other. 6. A ball seat made of a synthetic resin for a ball joint according to claim 5, wherein an axial groove for accommodating a lubricant communicating with a spherical groove for accommodating a lubricant is formed in cooperation with each other. . A socket having a cylindrical inner surface and a spherical inner surface connected in axial direction to the cylindrical inner surface, and a spherical outer surface having a cylindrical outer surface in contact with the cylindrical inner surface of the socket and in contact with the spherical inner surface of the socket A synthetic resin ball sheet for a ball joint according to any one of claims 1 to 7, and a second ball deformed following the first inner surface of the ball sheet and the inner surface of the socket. And a ball stud provided with a ball portion disposed in the ball seat, the spherical outer surface of the ball seat being a cylindrical inner surface of the ball seat. The cylindrical outer surface of the ball sheet disposed corresponding to the inner surface of the socket is deformed to follow the inner surface of the socket's spherical band, and is formed in the circumferential direction defining the wedge-shaped slit portion of the ball sheet. There a pair of opposing end faces which face each other, the ball joint in contact with each other.

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