JP2005132287A - Rack shaft support device, sealing member and its manufacturing method - Google Patents

Rack shaft support device, sealing member and its manufacturing method Download PDF

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JP2005132287A
JP2005132287A JP2003373081A JP2003373081A JP2005132287A JP 2005132287 A JP2005132287 A JP 2005132287A JP 2003373081 A JP2003373081 A JP 2003373081A JP 2003373081 A JP2003373081 A JP 2003373081A JP 2005132287 A JP2005132287 A JP 2005132287A
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sealing member
rack shaft
manufacturing
screw portion
male screw
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Masahiko Hirose
雅彦 広瀬
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Koyo Seiko Co Ltd
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Koyo Seiko Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive rack shaft support device with sufficient work efficiency for assembling, a sealing member and its manufacturing method. <P>SOLUTION: A swelling part 23 radially swelled is previously provided on a part of a male screw 20 at the rear end of the sealing member 17. When the sealing member 17 is threaded into a retaining hole 9, the swelling part 23 is friction-engaged with a female screw 9b without plastically deforming the female screw 9b of the retaining hole 9 to autonomously accomplish a rotation stopper of the sealing member 17. A lock nut is eliminated. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は操舵部材の回転動作に連動してピニオン軸を回転させ、これと噛み合うラック軸を軸長方向に往復移動させて操舵を行うラック・ピニオン式舵取り装置において、ラック軸を支持するラック軸支持装置に関し、またラック軸支持装置に用いる封止部材およびその製造方法にするものである。   The present invention relates to a rack-and-pinion type steering apparatus that performs steering by rotating a pinion shaft in conjunction with the rotation operation of a steering member and reciprocating a rack shaft meshing with the pinion shaft in the axial length direction. The present invention relates to a support device, and a sealing member used in a rack shaft support device and a manufacturing method thereof.

ラック軸のラックとピニオン軸のピニオンとの噛み合い部分では、ピニオン軸の回転に伴ってラック軸とピニオン軸との間に互いに離反する力が作用するため、ラック軸にたわみが発生し、ラック軸の歯すじ方向へのガタつきが大きくなり、ラックとピニオンとの歯部間に打音が生じる。
そこで、ハウジングに設けられた保持孔に前後に摺動自在な円筒状のサポートヨーク（ラックガイドともいう）を収容し、このサポートヨークによって、ラック軸の軸方向への移動を許容しつつ、ラック軸をピニオン軸側へ押圧するラック軸支持装置が提供されている（例えば特許文献１）。 At the meshed portion of the rack shaft rack and the pinion shaft pinion, as the pinion shaft rotates, a force separating them acts between the rack shaft and the pinion shaft, so that the rack shaft is deflected and the rack shaft The backlash in the direction of the tooth trace increases, and a hitting sound is generated between the teeth of the rack and the pinion.
Therefore, a cylindrical support yoke (also referred to as a rack guide) slidable back and forth is accommodated in a holding hole provided in the housing, and the rack is allowed to move in the axial direction of the rack shaft by the support yoke. A rack shaft support device that presses the shaft toward the pinion shaft is provided (for example, Patent Document 1).

このラック軸支持装置では、保持孔の入口に設けられた雌ねじ部に封止ねじがねじ込まれ、この封止ねじとサポートヨークとの間に付勢部材を介在させ、サポートヨークをラック軸側へ付勢している。封止ねじは保持孔内でのサポートヨークの後退位置を規制する機能を果たす。このため、封止ねじとサポートヨークとの間のクリアランスを厳密に調整した後、封止ねじに螺合させたロックナットを保持孔の周縁に締めつけて、封止部材の回り止めを達成している。
特開昭５４−１３８２３９号公報 In this rack shaft support device, a sealing screw is screwed into a female thread portion provided at the entrance of the holding hole, and an urging member is interposed between the sealing screw and the support yoke so that the support yoke moves toward the rack shaft. Energized. The sealing screw functions to regulate the retracted position of the support yoke in the holding hole. For this reason, after strictly adjusting the clearance between the sealing screw and the support yoke, the lock nut screwed to the sealing screw is tightened to the periphery of the holding hole to achieve detent of the sealing member. Yes.
JP 54-138239 A

しかしながら、ロックナットを用いる方式では、下記の問題がある。すなわち、ロックナットを締め付けるときに、封止部材が供回りし、封止部材の調整位置がずれてしまう場合がある。この場合、再度、上記のクリアランス調整が必要であり、作業工数が増加し、作業能率が悪いという問題がある。また、通例、封止部材とロックナットは別工程で仮組を行っており、この点からも作業能率が悪い。   However, the method using a lock nut has the following problems. That is, when the lock nut is tightened, the sealing member may be rotated and the adjustment position of the sealing member may be shifted. In this case, the above-described clearance adjustment is required again, and there are problems that the number of work steps increases and the work efficiency is poor. In general, the sealing member and the lock nut are temporarily assembled in separate steps, and the work efficiency is poor from this point.

本発明は上記課題に鑑みてなされたものであり、組み立ての作業能率が良く安価なラック軸支持装置並びに封止部材及びその製造方法を提供することを目的とする。   The present invention has been made in view of the above problems, and an object of the present invention is to provide a rack shaft support device, a sealing member, and a method for manufacturing the same that have good assembly work efficiency and are inexpensive.

上記目的を達成するため、本発明は、ラック軸を摺動自在に収容するハウジングと、このハウジングに設けられハウジングの開口形成面に開口を形成する保持孔と、この保持孔内に進退自在に保持されラック軸を軸方向に摺動可能に支持する支持部材と、この支持部材の後退位置を位置決めし保持孔の開口を封止する封止部材と、支持部材と封止部材の間に介在し支持部材をラック軸側に付勢する付勢部材とを備えるラック軸支持装置において、上記保持孔の入口の内周面に形成された雌ねじ部と、封止部材の外周面に形成され保持孔の雌ねじ部に螺合する雄ねじ部と、封止部材の後端の雄ねじ部に予め形成され径方向に膨出する膨出部とを備え、膨出部が雌ねじ部を塑性変形させることなく雌ねじ部に摩擦係合することで封止部材の回り止めが達成されたことを特徴とするラック軸支持装置を提供する。   In order to achieve the above object, the present invention provides a housing that slidably accommodates a rack shaft, a holding hole that is provided in the housing and forms an opening in the opening forming surface of the housing, and can be moved forward and backward in the holding hole. A supporting member that is held and supports the rack shaft so as to be slidable in the axial direction, a sealing member that positions the retracted position of the supporting member and seals the opening of the holding hole, and is interposed between the supporting member and the sealing member And a biasing member that biases the supporting member toward the rack shaft, a female screw portion formed on the inner peripheral surface of the inlet of the holding hole, and an outer peripheral surface of the sealing member. A male screw part that is screwed into the female screw part of the hole and a bulge part that is formed in advance on the male screw part at the rear end of the sealing member and bulges in the radial direction without the bulging part plastically deforming the female screw part. Locking of sealing member by frictional engagement with female thread Providing the rack shaft supporting device, characterized in that but was achieved.

本発明では、封止部材に予め形成された膨出部が雌ねじ部に摩擦係合して封止部材の回り止めを達成できるので、従来用いていたロックナットを廃止することができる。したがって、従来ロックナット使用時に必要であった面倒な再調整作業を廃止でき、組み立て作業の能率が格段に向上する。部品点数の削減と作業工数の削減で製造コストを格段に安くすることができる。   In the present invention, since the bulging portion formed in advance on the sealing member can be frictionally engaged with the female screw portion to achieve rotation prevention of the sealing member, the conventionally used lock nut can be eliminated. Therefore, the troublesome readjustment work conventionally required when using the lock nut can be eliminated, and the efficiency of the assembly work is greatly improved. Manufacturing costs can be significantly reduced by reducing the number of parts and working man-hours.

また、本発明は、上記ラック軸支持装置に用いる封止部材であって、雄ねじ部が形成された外周面と、後端の雄ねじ部の一部に形成され径方向に膨出する膨出部とを備えることを特徴とする封止部材を提供する。この場合、ラック軸支持装置に適用することで、安価に作業能率を向上させることができる。
また、本発明は、上記封止部材の製造方法であって、外周面に雄ねじ部形成用部分を有し且つこの雄ねじ部形成用部分の一部に膨出部が形成された製造用中間体を鍛造により形成する工程と、上記製造用中間体の雄ねじ部形成用部分にねじ転造を施す工程とを含むことを特徴とする封止部材の製造方法を提供する。鍛造であれば容易に膨出部を有する製造用中間体を得ることができ、製造コストを安くすることができる。 Further, the present invention is a sealing member used in the rack shaft support device, wherein the outer peripheral surface on which the male screw portion is formed and the bulging portion which is formed on a part of the male screw portion at the rear end and bulges in the radial direction. A sealing member is provided. In this case, the work efficiency can be improved at a low cost by applying to the rack shaft support device.
Moreover, this invention is a manufacturing method of the said sealing member, Comprising: The intermediate body for manufacture which has the part for external thread part formation in an outer peripheral surface, and the bulging part was formed in a part of this external thread part formation part A method for producing a sealing member is provided, which includes a step of forming a part by forging and a step of subjecting the male thread part forming portion of the production intermediate to thread rolling. If it is forging, the intermediate for manufacture which has a bulging part can be obtained easily, and manufacturing cost can be made cheap.

また、本発明は、上記封止部材の製造方法であって、鍛造成形品の外周面に雄ねじ部を加工して製造用中間体を形成する工程と、この製造用中間体の後面への局部加圧により製造用中間体の雄ねじ部の一部に膨出部を形成する工程とを含むことを特徴とする封止部材の製造方法を提供する。局部加圧であれば容易に膨出部を形成することができ、製造コストを安くすることができる。   Further, the present invention is a method for manufacturing the sealing member, the step of forming a manufacturing intermediate by processing a male screw portion on the outer peripheral surface of the forged molded product, and a local part to the rear surface of the manufacturing intermediate And a step of forming a bulging portion in a part of the male screw portion of the intermediate for production by pressurization. If it is local pressurization, the bulging part can be easily formed, and the manufacturing cost can be reduced.

本発明の好ましい実施の形態の添付図面を参照しつつ説明する。
図１は本発明の一実施の形態のラック軸支持装置１が適用されたラック・ピニオン式のステアリング装置２の断面図である。図１を参照して、ピニオン軸３は軸受４，５にてピニオンハウジング６内に回転可能に支持され、また、ラック軸７は図示しない軸受部材にて軸長方向（紙面に直交する方向）に沿って移動自在に支持されている。ピニオン軸３とラック軸７はピニオンハウジング６内で相互に噛み合わされている。図示していないが、ラック軸７の両端部はタイロッドを介して操向車輪に連結されており、図示しないステアリングホイール等の操舵部材の回転に伴ってラック軸７が軸長方向に移動し操向が行われる。 A preferred embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view of a rack and pinion type steering device 2 to which a rack shaft support device 1 according to an embodiment of the present invention is applied. Referring to FIG. 1, pinion shaft 3 is rotatably supported in pinion housing 6 by bearings 4 and 5, and rack shaft 7 is a shaft length direction (a direction perpendicular to the paper surface) by a bearing member (not shown). It is supported so that it can move along. The pinion shaft 3 and the rack shaft 7 are meshed with each other within the pinion housing 6. Although not shown, both ends of the rack shaft 7 are connected to the steering wheel via tie rods, and the rack shaft 7 moves in the axial length direction along with the rotation of a steering member such as a steering wheel (not shown). The direction is done.

ピニオンハウジング６にはラック軸７を隔ててピニオン軸３と反対側にラック軸支持装置１のハウジング８が設けられており、このハウジング８の保持孔９内に円筒状をなす支持部材としてのサポートヨーク１０が前後に進退自在に収容されている。ピニオンハウジング６およびハウジング８は例えばダイキャストにより製作される。また、サポートヨーク１０は、例えば焼結、ダイキャスト等により形成される。   The pinion housing 6 is provided with a housing 8 of the rack shaft support device 1 on the opposite side of the pinion shaft 3 across the rack shaft 7, and a support as a cylindrical support member in the holding hole 9 of the housing 8. The yoke 10 is accommodated so as to be able to move forward and backward. The pinion housing 6 and the housing 8 are manufactured by die casting, for example. The support yoke 10 is formed by, for example, sintering or die casting.

サポートヨーク１０の前面１０ａには、ラック軸７を軸長方向に摺動自在に支持する凹面１１が形成されている。この凹面１１にはラック軸７の周面に摺接するパッド１２が取り付けられている。サポートヨーク１０の後面１０ｂには、サポートヨーク１０をラック軸７側へ付勢する付勢部材としてのスプリング１３を収容するための凹所１４が形成されている。   The front surface 10a of the support yoke 10 is formed with a concave surface 11 that supports the rack shaft 7 so as to be slidable in the axial direction. A pad 12 slidably contacting the peripheral surface of the rack shaft 7 is attached to the concave surface 11. The rear surface 10b of the support yoke 10 is formed with a recess 14 for accommodating a spring 13 as a biasing member that biases the support yoke 10 toward the rack shaft 7 side.

サポートヨーク１０の外周面１０ｃには、周方向に延びて環状をなす一対の収容溝１５が形成され、各収容溝１５には例えばＯリングからなる環状の弾性部材１６がそれぞれ収容され、保持孔９の内周面９ａに弾性的に接触している。一対の弾性部材１６はサポートヨーク１０を径方向に弾性支持し、サポートヨーク１０のがたつきを防止する。
ハウジング８の保持孔９の入口における内周面９ａには雌ねじ部９ｂが形成され、この雌ねじ部９ｂに固定プラグからなる封止部材１７がねじ込まれて固定されている。 A pair of accommodation grooves 15 extending in the circumferential direction and forming an annular shape are formed on the outer peripheral surface 10c of the support yoke 10, and each accommodation groove 15 accommodates an annular elastic member 16 made of, for example, an O-ring. 9 is in elastic contact with the inner peripheral surface 9a. The pair of elastic members 16 elastically support the support yoke 10 in the radial direction and prevent the support yoke 10 from rattling.
A female threaded portion 9b is formed on the inner peripheral surface 9a at the entrance of the holding hole 9 of the housing 8, and a sealing member 17 made of a fixed plug is screwed and fixed to the female threaded portion 9b.

封止部材１７の前面１７ａはサポートヨーク１０の後面１０ｂに所定の隙間Ｓをあけて対向する。この隙間Ｓの量は、封止部材１７のねじ込み位置の調整により、例えば０．１ｍｍのように厳密に調整される。 封止部材１７の後面１７ｂには、封止部材１７を回動操作する工具に係合するための工具係合孔１８が形成されている。工具係合孔１８は例えば断面多角形形状に形成される。また、封止部材１７の外周面１７ｃには円筒面１９および雄ねじ部２０が形成されている。円筒部１９は、雄ねじ部２０よりも前側に雄ねじ部２０の谷径よりも小径に形成されている。円筒面１９には周方向に延びて環状をなす収容溝２１が形成され、この収容溝２１に例えばＯリングからなる環状のシール部材２２が収容されている。   The front surface 17a of the sealing member 17 faces the rear surface 10b of the support yoke 10 with a predetermined gap S therebetween. The amount of the gap S is strictly adjusted to 0.1 mm, for example, by adjusting the screwing position of the sealing member 17. On the rear surface 17b of the sealing member 17, a tool engaging hole 18 for engaging with a tool for rotating the sealing member 17 is formed. The tool engagement hole 18 is formed, for example, in a polygonal cross section. A cylindrical surface 19 and a male screw portion 20 are formed on the outer peripheral surface 17 c of the sealing member 17. The cylindrical portion 19 is formed with a diameter smaller than the root diameter of the male screw portion 20 on the front side of the male screw portion 20. The cylindrical surface 19 is formed with an annular accommodating groove 21 extending in the circumferential direction, and an annular sealing member 22 made of, for example, an O-ring is accommodated in the accommodating groove 21.

図１および図２を参照して、本実施の形態の特徴とするところは、封止部材１７の後端の雄ねじ部２０に径方向に膨出する微小な膨出部２３を予め設けておく点にある。これにより、封止部材１７を保持孔９にねじ込むと、膨出部２３が雌ねじ部９ｂを塑性変形させることなく雌ねじ部９ｂに摩擦係合することで封止部材１７を回り止めを自律的に達成することができる。   With reference to FIG. 1 and FIG. 2, the feature of the present embodiment is that a small bulging portion 23 that bulges in the radial direction is provided in advance on the male screw portion 20 at the rear end of the sealing member 17. In the point. Accordingly, when the sealing member 17 is screwed into the holding hole 9, the swollen portion 23 frictionally engages the female screw portion 9b without plastically deforming the female screw portion 9b, thereby autonomously preventing the rotation of the sealing member 17 Can be achieved.

その結果、従来のロックナットを廃止することができる。したがって、従来、ロックナット使用時に必要となる場合のあった面倒な再調整作業を廃止でき、組み立て作業の能率が格段に向上する。その結果、部品点数の削減と作業工数の削減を通じて製造コストを格段に安くすることができる。膨出部２３としては封止部材１７の周方向に等間隔をあけて複数設けることが好ましい。   As a result, the conventional lock nut can be eliminated. Therefore, the troublesome readjustment work that has been conventionally required when using the lock nut can be eliminated, and the efficiency of the assembly work is greatly improved. As a result, the manufacturing cost can be significantly reduced through the reduction of the number of parts and the reduction of the work man-hours. A plurality of bulging portions 23 are preferably provided at equal intervals in the circumferential direction of the sealing member 17.

また、図２を参照して、封止部材１７の軸方向に関する膨出部２３の長さＡとしては、１〜３．５ｍｍの範囲であれば好ましい。長さＡが１ｍｍ未満では、回り止め効果が低くなるおそれがあり、３．５ｍｍを超えると、雌ねじ部９ｂに悪影響を与えるおそれがあるので、この範囲に設定した。
また、封止部材１７の径方向に関する膨出部２３の突出量Ｂとしては、０．４〜０．６ｍｍの範囲にあれば良い。突出量Ｂが０．４ｍｍ未満では、回り止め効果が低くなるおそれがあり、０．６ｍｍを超えると、雌ねじ部９ｂに悪影響を与えるおそれがあるので、この範囲に設定した。 In addition, referring to FIG. 2, the length A of the bulging portion 23 in the axial direction of the sealing member 17 is preferably in the range of 1 to 3.5 mm. If the length A is less than 1 mm, the anti-rotation effect may be reduced. If the length A exceeds 3.5 mm, the internal thread portion 9b may be adversely affected.
Further, the protruding amount B of the bulging portion 23 in the radial direction of the sealing member 17 may be in the range of 0.4 to 0.6 mm. If the protrusion amount B is less than 0.4 mm, the anti-rotation effect may be reduced. If the protrusion amount B exceeds 0.6 mm, the internal thread portion 9b may be adversely affected.

封止部材１７の周方向に関して膨出部２３の幅（すなわち周長）としては、好ましくは３５．６４〜３６．２ｍｍが好ましい。幅が３５．６４ｍｍ未満では、回り止め効果が低くなるおそれがあり、３６．２ｍｍを超えると、雌ねじ部９ｂに悪影響を与えるおそれがあるので、この範囲に設定した。
次いで、図３Ａおよび図３Ｂを参照して、上記の封止部材１７を製造する方法について説明する。まず、鍛造工程によって、図３Ａに示すような製造用中間体３０を形成する。この製造用中間体３０は、封止部材１７の基本の外郭形状を既に形成しており、雄ねじ部２０がまだ形成されていない。 The width (that is, the circumferential length) of the bulging portion 23 with respect to the circumferential direction of the sealing member 17 is preferably 35.64 to 36.2 mm. If the width is less than 35.64 mm, the anti-rotation effect may be reduced, and if it exceeds 36.2 mm, the internal thread portion 9b may be adversely affected.
Next, a method for manufacturing the sealing member 17 will be described with reference to FIGS. 3A and 3B. First, a manufacturing intermediate 30 as shown in FIG. 3A is formed by a forging process. The manufacturing intermediate 30 has already formed the basic outline shape of the sealing member 17, and the male screw portion 20 has not yet been formed.

すなわち、製造用中間体３０の後面３０ｂには工具係合孔１８が形成され、製造用中間体３０の外周面３０ｃには円筒面１９および収容溝２１が形成されている。また、製造用中間体３０の外周面３０ｃには、円筒面からなる雄ねじ部形成用部分３１が形成されており、製造用中間体３０の後端において、上記雄ねじ部形成用部分３１には鍛造により複数の膨出部３２が円周等配に形成されている。   That is, the tool engagement hole 18 is formed in the rear surface 30 b of the manufacturing intermediate 30, and the cylindrical surface 19 and the housing groove 21 are formed in the outer peripheral surface 30 c of the manufacturing intermediate 30. Further, a male thread portion forming portion 31 having a cylindrical surface is formed on the outer peripheral surface 30 c of the manufacturing intermediate body 30, and the male thread portion forming portion 31 is forged at the rear end of the manufacturing intermediate body 30. Thus, a plurality of bulging portions 32 are formed in a circumferentially equidistant manner.

次いで、この製造用中間体３０の外周面３０ｃの雄ねじ部形成用部分３１にねじ転造を施すことにより、雄ねじ部２０と雄ねじ部２０の一部に膨出部２３を形成して封止部材１７を得る。
このように、通例実施している鍛造工程で同時に膨出部３２を形成して製造用中間体３０を得た後、ねじ転造を施すことで、雄ねじ部２０の膨出部２３を容易に実現でき、製造コストを安くすることができる。 Next, the external thread 30 forming portion 31 of the outer peripheral surface 30c of the manufacturing intermediate 30 is subjected to thread rolling, thereby forming the bulge 23 in a part of the external thread 20 and the external thread 20 to form a sealing member. Get 17.
Thus, after forming the bulging part 32 simultaneously in the forging process currently implemented and obtaining the intermediate body 30 for manufacture, the bulging part 23 of the external thread part 20 is easily performed by performing thread rolling. This can be realized and the manufacturing cost can be reduced.

次いで、図４Ａ、図４Ｂおよび図４Ｃを参照して、上記の封止部材１７を製造する別の方法について説明する。まず、封止部材１７の基本の外郭形状を形成した鍛造成形品４０を鍛造により得る。この鍛造成形品４０の後面４０ｂには、工具係合孔１８が形成され、鍛造成形品４０の外周面４０ｃには円筒面１９および収容溝２１が形成されている。また、製造用中間体４０の外周面４０ｃには、円筒面からなる雄ねじ部形成用部分４１が形成されている。   Next, another method for manufacturing the sealing member 17 will be described with reference to FIGS. 4A, 4B, and 4C. First, a forged product 40 in which the basic outline shape of the sealing member 17 is formed is obtained by forging. A tool engagement hole 18 is formed on the rear surface 40 b of the forged product 40, and a cylindrical surface 19 and a housing groove 21 are formed on the outer peripheral surface 40 c of the forged product 40. Further, a male thread portion forming portion 41 having a cylindrical surface is formed on the outer peripheral surface 40 c of the manufacturing intermediate 40.

次いで、この鍛造成形品４０の雄ねじ部形成用部分４１に雄ねじ部２０を加工して図４Ｂに示すような製造用中間体４２を得る。製造用中間体４２は後面４２ｂに工具係合孔１８を有し、外周面４２ｃに円筒面１９および収容溝２１を有している。
次いで、この製造用中間体４２の後面４２ｂにおいて、工具係合孔１８の周縁を周方向に等間隔をあけた複数の部位４３（図４Ｃ参照）にて、製造用中間体４２の軸方向に平行に延びる複数のかしめピン（図示せず）を用いて局部加圧することで、製造用中間体４２の後端における雄ねじ部２０を径方向外方へ局部的に膨出させ、図４Ｄに示すように、雄ねじ部２０の一部に膨出部３２が形成された封止部材１７を得る。 Next, the male screw portion 20 is processed into the male screw portion forming portion 41 of the forged molded product 40 to obtain a manufacturing intermediate 42 as shown in FIG. 4B. The manufacturing intermediate 42 has the tool engagement hole 18 on the rear surface 42b, and the cylindrical surface 19 and the accommodation groove 21 on the outer peripheral surface 42c.
Next, on the rear surface 42b of the manufacturing intermediate 42, the peripheral edge of the tool engagement hole 18 is circumferentially spaced at a plurality of portions 43 (see FIG. 4C) in the axial direction of the manufacturing intermediate 42. By locally pressurizing using a plurality of caulking pins (not shown) extending in parallel, the male threaded portion 20 at the rear end of the manufacturing intermediate 42 is locally bulged radially outward, as shown in FIG. 4D. Thus, the sealing member 17 in which the bulging portion 32 is formed in a part of the male screw portion 20 is obtained.

本製造方法によれば、通常の工程に局部加圧（かしめ）工程を加えるのみで、コスト安価に、膨出部３２を有する雄ねじ部２０を形成することができ、製造コストを安くすることができる。   According to this manufacturing method, it is possible to form the male screw portion 20 having the bulging portion 32 at a low cost only by adding a local pressurizing (caulking) step to a normal step, thereby reducing the manufacturing cost. it can.

図４の局部加圧により、雄ねじ部２０の円周の６箇所に周方向に等間隔で膨出部２３を形成した実施例の封止部材１７を製作した。封止部材１７の軸方向に関する膨出部２３の長さＡは２．６ｍｍであり、膨出部２３の突出量Ｂは、０．７ｍｍであり、封止部材１７の周方向に関する膨出部２３の幅（周長）は、３６ｍｍであった。
また、膨出部を形成しない点のみが上記の実施例と異なる比較例の封止部材を作成した。 The sealing member 17 of the Example which formed the bulging part 23 in the circumferential direction at equal intervals in six places of the periphery of the external thread part 20 by the local pressurization of FIG. 4 was manufactured. The length A of the bulging portion 23 in the axial direction of the sealing member 17 is 2.6 mm, the protruding amount B of the bulging portion 23 is 0.7 mm, and the bulging portion in the circumferential direction of the sealing member 17. The width (perimeter) of 23 was 36 mm.
Moreover, only the point which does not form a bulging part produced the sealing member of the comparative example different from said Example.

実施例および比較例の封止部材をハウジングの保持孔にねじ込んだ後、これを緩ますときのトルクを測定したところ、比較例が７Ｎ・ｍであったのに対して、実施例が２１Ｎ・ｍであり、緩みトルクとして、比較例に対して約３倍の増加を得ることができた。その結果、実施例に関して、ロックナッを廃止しても十分な回り止め効果が得られることが判明した。   After screwing the sealing member of the example and the comparative example into the holding hole of the housing and measuring the torque when loosening this, the comparative example was 7 N · m, whereas the example was 21 N · m. m, and an increase of about 3 times that of the comparative example was obtained as the loosening torque. As a result, it has been found that a sufficient anti-rotation effect can be obtained even if the lock nuts are abolished.

なお、本発明は上記各実施の形態に限定されるものではなく、本発明の特許請求の範囲で種々の変更を施すことができる。   In addition, this invention is not limited to said each embodiment, A various change can be given in the claim of this invention.

本発明の一実施の形態のラック軸支持装置が適用されたをラック・ピニオン式のステアリング装置の要部の断面図である。1 is a cross-sectional view of a main part of a rack and pinion type steering device to which a rack shaft support device according to an embodiment of the present invention is applied. 封止部材の要部の拡大断面図である。It is an expanded sectional view of the important section of a sealing member. 図３Ａおよび図３Ｂは第１の製造方法により封止部材を製造する工程を順次に示す模式的断面図である。3A and 3B are schematic cross-sectional views sequentially showing steps of manufacturing a sealing member by the first manufacturing method. 図４Ａ，図４Ｂ，図４Ｃおよび図４Ｄは第２の製造方法により封止部材を製造する工程を順次に示す模式的断面図である。4A, 4B, 4C, and 4D are schematic cross-sectional views sequentially showing steps of manufacturing the sealing member by the second manufacturing method.

符号の説明Explanation of symbols

１ ラック軸支持装置
２ ステアリング装置
３ ピニオン軸
７ ラック軸
８ ハウジング
９ 保持孔
９ａ 内周面
９ｂ 雌ねじ部
１０ サポートヨーク（支持部材）
１０ａ 前面
１０ｂ 後面
１０ｃ 外周面
１３ スプリング（付勢部材）
１７ 封止部材
１７ａ 前面
１７ｂ 後面
１７ｃ 外周面
１８ 工具係合孔
２０ 雄ねじ部
２３ 膨出部
３０ 製造用中間体
３０ｃ 外周面
３１ 雄ねじ部形成用部分
３２ 膨出部
４０ 鍛造成形品
４０ｃ 外周面
４１ 雄ねじ部形成用部分
４２ 製造用中間体
４２ｂ 後面
４２ｃ 外周面 DESCRIPTION OF SYMBOLS 1 Rack shaft support apparatus 2 Steering apparatus 3 Pinion shaft 7 Rack shaft 8 Housing 9 Holding hole 9a Inner peripheral surface 9b Female thread part 10 Support yoke (support member)
10a Front surface 10b Rear surface 10c Outer peripheral surface 13 Spring (biasing member)
17 sealing member 17a front surface 17b rear surface 17c outer peripheral surface 18 tool engaging hole 20 male screw portion 23 bulging portion 30 production intermediate 30c outer peripheral surface 31 male screw portion forming portion 32 bulging portion 40 forged product 40c outer peripheral surface 41 male screw Part forming portion 42 Manufacturing intermediate 42b Rear surface 42c Outer peripheral surface

Claims (4)

ラック軸を摺動自在に収容するハウジングと、このハウジングに設けられハウジングの開口形成面に開口を形成する保持孔と、この保持孔内に進退自在に保持されラック軸を軸方向に摺動可能に支持する支持部材と、この支持部材の後退位置を位置決めし保持孔の開口を封止する封止部材と、支持部材と封止部材の間に介在し支持部材をラック軸側に付勢する付勢部材とを備えるラック軸支持装置において、
上記保持孔の入口の内周面に形成された雌ねじ部と、
封止部材の外周面に形成され保持孔の雌ねじ部に螺合する雄ねじ部と、
封止部材の後端の雄ねじ部に予め形成され径方向に膨出する膨出部とを備え、
膨出部が雌ねじ部を塑性変形させることなく雌ねじ部に摩擦係合することで封止部材の回り止めが達成されたことを特徴とするラック軸支持装置。 A housing that slidably accommodates the rack shaft, a holding hole that is provided in the housing and forms an opening in the opening forming surface of the housing, and is slidably moved in the holding hole so that the rack shaft can be slid in the axial direction. A supporting member for supporting the support member, a sealing member for positioning the retracted position of the supporting member and sealing the opening of the holding hole, and a support member interposed between the supporting member and the sealing member to bias the supporting member toward the rack shaft side. In a rack shaft support device comprising an urging member,
An internal thread formed on the inner peripheral surface of the inlet of the holding hole;
A male screw portion formed on the outer peripheral surface of the sealing member and screwed into the female screw portion of the holding hole;
A pre-formed bulge portion that is pre-formed on the male thread portion at the rear end of the sealing member and bulges in the radial direction;
A rack shaft support device, wherein the bulging portion is frictionally engaged with the female screw portion without plastically deforming the female screw portion, thereby preventing the sealing member from rotating. 請求項１記載のラック軸支持装置に用いる封止部材であって、雄ねじ部が形成された外周面と、後端の雄ねじ部の一部に形成され径方向に膨出する膨出部とを備えることを特徴とする封止部材。   A sealing member used in the rack shaft support device according to claim 1, wherein an outer peripheral surface on which a male screw portion is formed, and a bulging portion that is formed on a part of the male screw portion at the rear end and bulges in a radial direction. A sealing member comprising the sealing member. 請求項２記載の封止部材の製造方法であって、外周面に雄ねじ部形成用部分を有し且つこの雄ねじ部形成用部分の一部に膨出部が形成された製造用中間体を鍛造により形成する工程と、上記製造用中間体の雄ねじ部形成用部分にねじ転造を施す工程とを含むことを特徴とする封止部材の製造方法。   3. The method for manufacturing a sealing member according to claim 2, wherein a manufacturing intermediate having a male screw portion forming portion on an outer peripheral surface and a bulging portion formed in a part of the male screw portion forming portion is forged. The manufacturing method of the sealing member characterized by including the process formed by these, and the process of performing thread rolling to the external thread part formation part of the said intermediate body for manufacture. 請求項２記載の封止部材の製造方法であって、鍛造成形品の外周面に雄ねじ部を加工して製造用中間体を形成する工程と、この製造用中間体の後面への局部加圧により製造用中間体の雄ねじ部の一部に膨出部を形成する工程とを含むことを特徴とする封止部材の製造方法。   It is a manufacturing method of the sealing member of Claim 2, Comprising: The process of processing an external thread part in the outer peripheral surface of a forge molded product, and forming the manufacturing intermediate body, and the local pressurization to the rear surface of this manufacturing intermediate body And a step of forming a bulging portion in a part of the male screw portion of the manufacturing intermediate.
JP2003373081A 2003-10-31 2003-10-31 Rack shaft support device, sealing member and its manufacturing method Withdrawn JP2005132287A (en)

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WO2006123719A1 (en) 2005-05-18 2006-11-23 Jtekt Corporation Rack guide, and rack and pinion steering device with the rack guide
WO2007013173A1 (en) * 2005-07-29 2007-02-01 Jtekt Corporation Method and structure for preventing screw from loosening and method of manufacturing male screw
JP2007296923A (en) * 2006-04-28 2007-11-15 Jtekt Corp Steering device for vehicle
US7815204B2 (en) * 2006-04-24 2010-10-19 Oiles Corporation Rack-and-pinion type steering apparatus
JP2013199158A (en) * 2012-03-23 2013-10-03 Nsk Ltd Method for fixing adjusting screw of steering device, and steering device
JP2013241051A (en) * 2012-05-18 2013-12-05 Nsk Ltd Method of fixing adjustment screw of steering device and steering device
CN105619163A (en) * 2016-03-21 2016-06-01 中车青岛四方机车车辆股份有限公司 Protecting device for threaded hole

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006123719A1 (en) 2005-05-18 2006-11-23 Jtekt Corporation Rack guide, and rack and pinion steering device with the rack guide
EP1882622A1 (en) * 2005-05-18 2008-01-30 JTEKT Corporation Rack guide, and rack and pinion steering device with the rack guide
EP1882622A4 (en) * 2005-05-18 2012-05-30 Jtekt Corp Rack guide, and rack and pinion steering device with the rack guide
WO2007013173A1 (en) * 2005-07-29 2007-02-01 Jtekt Corporation Method and structure for preventing screw from loosening and method of manufacturing male screw
EP1914430A1 (en) * 2005-07-29 2008-04-23 JTEKT Corporation Method and structure for preventing screw from loosening and method of manufacturing male screw
EP1914430A4 (en) * 2005-07-29 2009-11-25 Jtekt Corp Method and structure for preventing screw from loosening and method of manufacturing male screw
US7815204B2 (en) * 2006-04-24 2010-10-19 Oiles Corporation Rack-and-pinion type steering apparatus
JP2007296923A (en) * 2006-04-28 2007-11-15 Jtekt Corp Steering device for vehicle
JP2013199158A (en) * 2012-03-23 2013-10-03 Nsk Ltd Method for fixing adjusting screw of steering device, and steering device
JP2013241051A (en) * 2012-05-18 2013-12-05 Nsk Ltd Method of fixing adjustment screw of steering device and steering device
CN105619163A (en) * 2016-03-21 2016-06-01 中车青岛四方机车车辆股份有限公司 Protecting device for threaded hole

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