上記内側、外側両係合溝４５、４６及び止め輪４４の寸法を上述の様に規制する為、この止め輪４４を内側係合溝４５部分に装着した状態で、上記外輪３ａを上記ナックル３０の支持孔３２に挿入すれば、前記車輪用軸受ユニット１ａと上記ナックル３０とを不離に結合できる。即ち、上記外輪３ａをこのナックル３０に対し結合する場合には、上記止め輪４４を上記内側係合溝４５部分に装着した状態で、上記外輪３ａを上記支持孔３２に、外側から内側に、図１、２の左から右に挿入する。この挿入作業により上記止め輪４４は、上記支持孔３２の外端部に形成した円すい凹面状のガイド面４８に案内されつつ、外径が弾性的に縮められて、上記支持孔３２内に押し込まれる。そして、上記止め輪４４と外側係合溝４６とが整合した状態で、この止め輪４４の直径が、この止め輪４４の外周縁が上記外側係合溝４６の底面に当接する状態に迄、弾性的に広がる。そして、この様に止め輪４４の直径が弾性的に広がった状態で、この止め輪４４が上記内側、外側両係合溝４５、４６同士の間に掛け渡された状態になって、上記外輪３ａが上記支持孔３２から抜け出る事が防止され、上記車輪用軸受ユニット１ａとナックル３０とが不離に結合される。
In order to restrict the dimensions of the inner and outer engagement grooves 45 and 46 and the snap ring 44 as described above, the outer ring 3a is mounted on the knuckle 30 with the snap ring 44 attached to the inner engagement groove 45. The wheel bearing unit 1a and the knuckle 30 can be coupled together indiscriminately by being inserted into the support hole 32 of FIG. That is, when the outer ring 3a is coupled to the knuckle 30, the outer ring 3a is attached to the support hole 32 from the outer side to the inner side in a state where the snap ring 44 is attached to the inner engagement groove 45. Insert from left to right in Figures 1 and 2. By this insertion operation, the retaining ring 44 is guided by the conical concave guide surface 48 formed at the outer end of the support hole 32, and its outer diameter is elastically contracted and pushed into the support hole 32. Be In a state where the aforementioned retaining ring 44 and the outer engagement grooves 46 are aligned, the diameter of the retaining ring 44, the outer peripheral edge of the retaining ring 44 until the abutting state on the bottom of the outer engagement grooves 46, It spreads elastically. Then, in a state in which the diameter of the snap ring 44 is elastically expanded in this manner, the snap ring 44 is in a state of being stretched between the inner and outer engagement grooves 45, 46, and the outer ring It is prevented that 3a slips out of the support hole 32, and the wheel bearing unit 1a and the knuckle 30 are coupled together in an invariable manner.
上記ナックル３０に車輪用軸受ユニット１ａを結合する場合には、上記止め輪５４を上記内側係合溝４５部分に装着した状態で、上記第一、第二各腕部５６、５７を上記凹入部４７ａに整合させつつ、上記外輪３ａを上記支持孔３２に、外側から内側に、図７の左から右に挿入する。この挿入作業に伴って、上記止め輪５４は、上記支持孔３２の外端部に形成した円すい凹面状のガイド面４８に案内されつつ、本体部５５の外径が上記支持孔３２の内径以下に弾性的に縮められて、この支持孔３２内に押し込まれる。そして、上記本体部５５と外側係合溝４６とが整合した状態で、この本体部５５の直径が、この本体部５５の外周縁が上記外側係合溝４６の底面に当接する状態に迄、弾性的に広がる。そして、この様に本体部５５の直径が弾性的に広がった状態で、この本体部５５が上記内側、外側両係合溝４５、４６同士の間に掛け渡された状態になって、上記外輪３ａが上記支持孔３２から抜け出る方向に変位する事が防止され、車輪用軸受ユニット１ａとナックル３０とが不離に結合される。
When the wheel bearing unit 1a is coupled to the knuckle 30, the first and second arm portions 56 and 57 are engaged with the recessed portion while the snap ring 54 is attached to the inner engagement groove 45. while matched to 47 a, the outer ring 3a in the support hole 32, from the outside to the inside, is inserted from left to right in FIG. With the insertion operation, the retaining ring 54 is guided by the conical concave guide surface 48 formed at the outer end of the support hole 32, and the outer diameter of the main body 55 is smaller than the inner diameter of the support hole 32. And is compressed into this support hole 32. Then, in a state where the main body portion 55 and the outer engagement groove 46 are aligned, the diameter of the main body portion 55 is such that the outer peripheral edge of the main body portion 55 abuts on the bottom surface of the outer engagement groove 46, It spreads elastically. Then, in a state in which the diameter of the main body portion 55 is elastically expanded in this manner, the main body portion 55 is in a state of being bridged between the inner and outer engagement grooves 45 and 46 and the outer ring The displacement of the wheel 3a in the direction of coming out of the support hole 32 is prevented, and the wheel bearing unit 1a and the knuckle 30 are coupled together in an indelible manner.
