JP2012051002A - Inner shaft of telescopic shaft and method of manufacturing the same - Google Patents

Inner shaft of telescopic shaft and method of manufacturing the same Download PDF

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JP2012051002A
JP2012051002A JP2010195361A JP2010195361A JP2012051002A JP 2012051002 A JP2012051002 A JP 2012051002A JP 2010195361 A JP2010195361 A JP 2010195361A JP 2010195361 A JP2010195361 A JP 2010195361A JP 2012051002 A JP2012051002 A JP 2012051002A
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shaft
punch
workpiece
inner shaft
longitudinal direction
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Shigeru Tanaka
茂 田中
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MITSUBOSHI SEISAKUSHO
MITSUBOSHI SEISAKUSHO KK
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MITSUBOSHI SEISAKUSHO
MITSUBOSHI SEISAKUSHO KK
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Abstract

PROBLEM TO BE SOLVED: To inexpensively obtain an inner shaft of a telescopic shaft such as being used in a telescopic mechanism of a steering shaft, and to reduce the weight of the inner shaft and to secure the dimensional accuracy thereof.SOLUTION: A method of manufacturing an inner shaft of a telescopic shaft is provide, and comprises: a first step of forming an outer circumferential surface having rolling grooves, by drawing a portion of a metallic pipe where the rolling grooves are to be formed, using dies and punches; and a second step of expanding a workpiece 32 having been subjected to the first step thereby forming an inner circumferential surface, by inserting a third punch 62 into the workpiece 32 by pressurization so as to penetrate it while the workpiece 32 is inserted into and held by a third die 61.

Description

この発明は、たとえばステアリングシャフト（中間軸を含む。）のテレスコピック機構などを構成する伸縮自在シャフトの内軸とその製法に関する。   The present invention relates to an inner shaft of a telescopic shaft constituting a telescopic mechanism of a steering shaft (including an intermediate shaft) and a method for manufacturing the same.

伸縮自在シャフトの内軸には、転動体が転動する転動溝を、長手方向に沿って有するものがある。このような内軸は、下記特許文献１に開示されているように中実構造であった。すなわち、中実の棒状素材に対する塑性変形により転動溝などが加工されていた。   Some inner shafts of telescopic shafts have rolling grooves along the longitudinal direction in which rolling elements roll. Such an inner shaft has a solid structure as disclosed in Patent Document 1 below. That is, a rolling groove or the like has been processed by plastic deformation of a solid rod-shaped material.

特開２００８−６９０３号公報JP 2008-6903 A

しかし、このような製法では、製造コストがかかる上に、軽量化を図れない難点があった。   However, in such a manufacturing method, the manufacturing cost is high and there is a problem that the weight cannot be reduced.

そこでこの発明は、コストを抑えつつ軽量化を図れるような伸縮自在シャフトの内軸を得ることを主たる目的とする。   Accordingly, the main object of the present invention is to obtain an inner shaft of a telescopic shaft that can be reduced in weight while suppressing cost.

そのための手段は、転動体を転動可能に保持するため長手方向に沿って延びる転動溝を外周面に有し、長手方向に相対移動可能で、且つトルク伝達可能に、筒状の外軸に対して挿入される伸縮自在シャフトの内軸の製造方法であって、金属パイプにおける前記転動溝を形成する部分を金型とパンチを用いて絞り加工して前記転動溝を有する外周面を形成する第１工程と、該第１工程の終了後のワークに、金型と、前記ワーク内に加圧挿入されるパンチとを用いて拡管加工して内周面を成形する第２工程とを備える伸縮自在シャフトの内軸の製造方法である。   For this purpose, the cylindrical outer shaft has a rolling groove on the outer peripheral surface extending along the longitudinal direction so as to hold the rolling element so as to be able to roll, can move relative to the longitudinal direction, and can transmit torque. A method for manufacturing an inner shaft of a telescopic shaft to be inserted into an outer peripheral surface having a rolling groove formed by drawing a portion of a metal pipe that forms the rolling groove using a mold and a punch And a second step of forming the inner peripheral surface of the workpiece after completion of the first step by expanding the tube using a die and a punch inserted into the workpiece under pressure. Is a manufacturing method of an inner shaft of a telescopic shaft.

別の手段は、転動体を転動可能に保持するため長手方向に沿って延びる転動溝を外周面に有し、長手方向に相対移動可能で、且つトルク伝達可能に、筒状の外軸に対して挿入される伸縮自在シャフトの内軸であって、一端から他端まで中空に形成された伸縮自在シャフトの内軸である。   Another means has a rolling groove extending along the longitudinal direction on the outer peripheral surface to hold the rolling element so as to be able to roll, and is capable of relative movement in the longitudinal direction and torque transmission so as to be able to transmit torque. It is an inner shaft of a telescopic shaft that is inserted into the telescopic shaft, and is an inner shaft of a telescopic shaft that is formed hollow from one end to the other end.

この発明によれば、金属パイプから製造するので、材料コストを抑えることができるとともに、金型とパンチで加工するので加工にかかるコストも抑えることができる。また、中空構造であるので、軽量化を図れ、低燃費に資することができる。さらに、第１工程で外周面を形成した後、第２工程で内周面を拡管加工するので、転動溝の寸法精度は高い。   According to this invention, since it manufactures from a metal pipe, it can suppress material cost, and since it processes by a metal mold | die and a punch, the cost concerning a process can also be suppressed. Moreover, since it is a hollow structure, weight reduction can be achieved and it can contribute to a low fuel consumption. Furthermore, since the inner peripheral surface is expanded in the second step after the outer peripheral surface is formed in the first step, the dimensional accuracy of the rolling groove is high.

伸縮自在シャフトの内軸の形態を示す説明図。Explanatory drawing which shows the form of the inner shaft of a telescopic shaft. 伸縮自在シャフトの内軸の要部の断面図。Sectional drawing of the principal part of the inner shaft of a telescopic shaft. 伸縮自在シャフトの内軸の製造に用いる金属パイプの断面図。Sectional drawing of the metal pipe used for manufacture of the inner shaft of a telescopic shaft. 第１工程の第１段階の説明図。Explanatory drawing of the 1st step of a 1st process. 第１工程の第２段階の説明図。Explanatory drawing of the 2nd step of a 1st process. 第２工程の加工前の状態の説明図。Explanatory drawing of the state before the process of a 2nd process. 第２工程の加工後の状態の説明図。Explanatory drawing of the state after the process of a 2nd process. 仕上げ加工の説明図。Explanatory drawing of finishing.

この発明を実施するための一形態を、以下図面を用いて説明する。
図１は、伸縮自在シャフトの内軸１１（以下、「内軸」という。）を示し、図１中、（ａ）は正面図、（ｂ）は左側面図、（ｃ）は右側面図、（ｄ）は（ｂ）におけるＡ−Ａ断面図、（ｅ）は平面図である。これらの図に示すように、内軸１１は、一端から他端にかけて略全体にわたって断面略正方形状をなす嵌合部１２が形成され、他端部に、断面円形をなし外周面にセレーション１３を有する接続部１４が形成されている。前記嵌合部１２の外周面における相反する２つの面には、長手方向に延びる転動溝１５が形成されている。この転動溝１５には、図２に仮想線で示したように、鋼球からなる転動体２１が保持される。そして、嵌合部１２が図示しない筒状の外軸内に挿入され、外軸との間で、長手方向に相対移動可能でかつトルク伝達可能な状態となる。 An embodiment for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 shows an inner shaft 11 (hereinafter referred to as “inner shaft”) of a telescopic shaft. In FIG. 1, (a) is a front view, (b) is a left side view, and (c) is a right side view. (D) is AA sectional drawing in (b), (e) is a top view. As shown in these drawings, the inner shaft 11 is formed with a fitting portion 12 having a substantially square cross section from one end to the other end, and has a circular cross section at the other end and a serration 13 on the outer peripheral surface. A connecting portion 14 is formed. Rolling grooves 15 extending in the longitudinal direction are formed on two opposite surfaces on the outer peripheral surface of the fitting portion 12. As shown by the phantom lines in FIG. 2, rolling elements 21 made of steel balls are held in the rolling grooves 15. And the fitting part 12 will be inserted in the cylindrical outer shaft which is not shown in figure, and will be in the state which can be relatively moved to a longitudinal direction between the outer shafts, and can transmit torque.

また、内部には一端から他端にかけて連通する貫通孔１６が形成されて、全体が中空状をなす。   Further, a through hole 16 communicating from one end to the other end is formed inside, and the whole is hollow.

このような内軸１１の製造方法を、図３乃至図８を用いて、次に説明する。   Next, a method for manufacturing the inner shaft 11 will be described with reference to FIGS.

まず、図３に示したように素材となる円筒状をなす塑性金属製の金属パイプ３１を用意する。図３（ａ）は金属パイプ３１の長手方向に沿った断面図、図３（ｂ）は（ａ）におけるＢ−Ｂ切断部端面図である。   First, as shown in FIG. 3, a cylindrical metal pipe 31 made of plastic metal is prepared. Fig.3 (a) is sectional drawing along the longitudinal direction of the metal pipe 31, FIG.3 (b) is BB cutting part end elevation in (a).

次に、この金属パイプ３１に前記嵌合部１２を形成するための絞り加工をする第１工程を行う。この第１工程は２段階に分けて行う。   Next, a first process of drawing the metal pipe 31 to form the fitting portion 12 is performed. This first step is performed in two stages.

まず先に、第１段階として、図４に示したように、第１金型４１と第１パンチ４２を用いて、図４（ｂ）に示したような正方形状に絞り加工する。前記第１金型４１は、前記金属パイプ３１の直径と嵌合対応する径の円形孔部４３と、略テーパコーン状の縮径部４４と、金属パイプ３１の直径よりも小径の角孔部４５とを有する。第１パンチ４２は、前記円形孔部４３内において金属パイプ３１の他端面を加圧する加圧面４６を有する。   First, as a first stage, as shown in FIG. 4, the first die 41 and the first punch 42 are used to draw into a square shape as shown in FIG. The first mold 41 includes a circular hole 43 having a diameter corresponding to the diameter of the metal pipe 31, a reduced diameter part 44 having a substantially tapered cone shape, and a square hole 45 having a diameter smaller than the diameter of the metal pipe 31. And have. The first punch 42 has a pressing surface 46 that pressurizes the other end surface of the metal pipe 31 in the circular hole 43.

すなわち、第１金型４１内に図３に示す金属パイプ３１を挿入し、第１パンチ４２で金属パイプ３１を加圧して、ワーク３２の一端側から他端部にかけて延びる中空状の角筒状部３２ａと、テーパ状をなすテーパ部３２ｂを絞り加工する。図４（ａ）は、第１金型４１とワーク３２の長手方向に沿った断面図と第１パンチ４２の側面図、図４（ｂ）は（ａ）におけるＣ−Ｃ切断部端面図である。   That is, a metal pipe 31 shown in FIG. 3 is inserted into the first mold 41, the metal pipe 31 is pressurized by the first punch 42, and a hollow rectangular tube shape extending from one end side to the other end portion of the work 32. The portion 32a and the tapered portion 32b having a tapered shape are drawn. 4A is a cross-sectional view of the first die 41 and the workpiece 32 along the longitudinal direction, and a side view of the first punch 42. FIG. 4B is an end view of the C-C cut portion in FIG. is there.

次に、第２段階として、図５に示したように、第２金型５１と前記第２パンチ５２を用いて、図５（ｂ）に示したような、後に前記転動溝１５となる溝部３２ｃを有する略方形状に絞り加工する。前記第２金型５１は、前記第１金型４１と同様に、前記金属パイプ３１の直径と嵌合対応する径の円形孔部５３と、略テーパコーン状の縮径部５４と、金属パイプ３１の直径よりも小径の角孔部５５とを有し、該角孔部５５の内周面には、前記溝部３２ｃを形成する２本の突条５６を有する。第２パンチ５２は、前記第１パンチ４２と同一形状で、前記円形孔部５３内においてワーク３２の他端面を加圧する加圧面５７を有する。   Next, as a second stage, as shown in FIG. 5, the second die 51 and the second punch 52 are used to form the rolling groove 15 later as shown in FIG. 5B. Drawing is performed into a substantially square shape having the groove 32c. Similar to the first mold 41, the second mold 51 includes a circular hole portion 53 having a diameter corresponding to the diameter of the metal pipe 31, a reduced diameter portion 54 having a substantially tapered cone shape, and the metal pipe 31. A square hole portion 55 having a diameter smaller than that of the first hole portion, and an inner peripheral surface of the square hole portion 55 has two protrusions 56 forming the groove portion 32c. The second punch 52 has the same shape as the first punch 42 and has a pressure surface 57 that pressurizes the other end surface of the workpiece 32 in the circular hole 53.

すなわち、第２金型５１内に、第１金型４１と第１パンチ４２で絞り加工した後のワーク３２を挿入し、第２パンチ５２でワーク３２を加圧して、ワーク３２の一端側から他端部にかけて中空状で前記溝部３２ｃを有する略角筒状部３２ａを絞り加工する。前記溝部３２ｃは、前記転動溝１５の所望の寸法と同一寸法になるように形成される。図５（ａ）は、第２金型５１とワーク３２の長手方向に沿った断面図と第２パンチ５２の側面図、図５（ｂ）は（ａ）におけるＤ−Ｄ切断部端面図である。   That is, the workpiece 32 after drawing with the first die 41 and the first punch 42 is inserted into the second die 51, and the workpiece 32 is pressurized with the second punch 52, and from one end side of the workpiece 32. A substantially rectangular tube-shaped portion 32a that is hollow and has the groove 32c is drawn to the other end. The groove 32c is formed to have the same dimension as the desired dimension of the rolling groove 15. 5A is a cross-sectional view of the second mold 51 and the workpiece 32 along the longitudinal direction, and a side view of the second punch 52. FIG. 5B is an end view of the DD cut portion in FIG. is there.

続いて、第２工程に移行し、第１工程で加工したワーク３２に拡管加工をして内周面を成形する。   Then, it transfers to a 2nd process, the pipe | tube expansion process is carried out to the workpiece | work 32 processed at the 1st process, and an internal peripheral surface is shape | molded.

第２工程は、図６に示したような、第３金型６１と第３パンチ６２を用いて行う。第３金型６１は、前記第２金型５１と同一形状で、前記金属パイプ３１の直径と嵌合対応する径の円形孔部６３と、略テーパコーン状の縮径部６４と、金属パイプ３１の直径よりも小径の角孔部６５とを有し、該角孔部６５の内周面には、前記溝部３２ｃを形成する２本の突条６６を有する。前記第２金型５１を用いることもできる。   The second step is performed using a third mold 61 and a third punch 62 as shown in FIG. The third mold 61 has the same shape as the second mold 51, a circular hole 63 having a diameter corresponding to the diameter of the metal pipe 31, a reduced diameter part 64 having a substantially tapered cone shape, and the metal pipe 31. A square hole portion 65 having a diameter smaller than the diameter of the square hole portion 65, and the inner peripheral surface of the square hole portion 65 has two protrusions 66 forming the groove portion 32c. The second mold 51 can also be used.

第３パンチ６２は、ワーク３２内を挿通可能な棒状軸６７の先端に形成され、先端側からテーパ部６８としごき部６９を有する。テーパ部６８及びしごき部６９の断面形状は正方形の相反する２つの面を凹状に湾曲した凹部６８ａ，６９ａを有する形状である。この凹部６８ａ，６９ａが、前記溝部３２ｃ部分に対応する部分である。図６（ａ）は第３金型６１とワーク３２の長手方向に沿った断面図と第３パンチ６２の側面図、図６（ｂ）は第３パンチ６２の正面図である。   The third punch 62 is formed at the tip of a rod-shaped shaft 67 that can be inserted through the workpiece 32, and has a tapered portion 68 and an ironing portion 69 from the tip side. The cross-sectional shape of the taper part 68 and the ironing part 69 is the shape which has the recessed parts 68a and 69a which curved two opposing surfaces of the square into the concave shape. The recesses 68a and 69a are portions corresponding to the groove portion 32c. 6A is a cross-sectional view of the third die 61 and the workpiece 32 along the longitudinal direction, and a side view of the third punch 62. FIG. 6B is a front view of the third punch 62. FIG.

すなわち、第２金型５１と第２パンチ５２で絞り加工されたワーク３２を第３金型６１に挿入し、ワーク３２内に第３パンチ６２を加圧挿入して、ワーク３２の他端から一端にかけて貫いて、図７に示したように拡管加工する。具体的には、第３金型６１の内周面の角孔部６５と第３パンチ６２のしごき部６９との間でしごき、所定の肉厚に仕上げるとともに、前記嵌合部１２の外周面、特に溝部３２ｃの寸法を所定値に仕上げて、所望寸法の前記転動溝１５を形成する。図７（ａ）は第３金型６１とワーク３２の長手方向に沿った断面図と第３パンチ６２の側面図、図７（ｂ）は、第３パンチ６２で拡管加工している状態を示す断面図である。   That is, the workpiece 32 drawn by the second die 51 and the second punch 52 is inserted into the third die 61, and the third punch 62 is press-inserted into the workpiece 32, and the other end of the workpiece 32 is inserted. Through one end, the tube is expanded as shown in FIG. Specifically, ironing is performed between the square hole portion 65 on the inner peripheral surface of the third mold 61 and the ironing portion 69 of the third punch 62 to finish to a predetermined thickness, and the outer peripheral surface of the fitting portion 12. In particular, the rolling groove 15 having a desired dimension is formed by finishing the dimension of the groove 32c to a predetermined value. 7A is a cross-sectional view of the third die 61 and the workpiece 32 along the longitudinal direction, and a side view of the third punch 62. FIG. 7B is a state where the third punch 62 is expanded. It is sectional drawing shown.

最後に、このような第２工程を経て加工されたワーク３２に対して仕上げ加工を行う。すなわち、図８に示したように、ワーク３２における前記接続部１４に対応する部位にセレーション１３を加工するとともに、両端部を切削加工して、所望の形態に仕上げる。これによって内軸１１が完成する。   Finally, finishing is performed on the workpiece 32 processed through the second step. That is, as shown in FIG. 8, the serrations 13 are processed at the portions corresponding to the connection portions 14 in the work 32 and both end portions are cut to finish in a desired form. As a result, the inner shaft 11 is completed.

以上のように、内軸１１は、金属パイプ３１の外周面に対して２段階で絞り加工をする第１工程を経て製造されるので、転動溝１５を有する嵌合部１２が無理なく加工できる。   As described above, the inner shaft 11 is manufactured through the first step of drawing the outer peripheral surface of the metal pipe 31 in two stages, so that the fitting portion 12 having the rolling groove 15 can be processed without difficulty. it can.

また、このような第１工程を経た後にワーク３２内に第３パンチ６２を加圧挿入して拡管加工をして内周面を成形する第２工程を行うので、嵌合部１２の外周面の寸法精度を出せる。このため、転動溝１５の寸法精度は高く、所望の伸縮機能を良好に発揮できる。   In addition, since the second step of forming the inner peripheral surface by press-inserting the third punch 62 into the workpiece 32 and forming the inner peripheral surface after the first step is performed, the outer peripheral surface of the fitting portion 12 is performed. Dimensional accuracy can be achieved. For this reason, the dimensional accuracy of the rolling groove 15 is high, and a desired expansion / contraction function can be exhibited well.

さらに、内軸１１は金属パイプ３１から製造されるので、材料コストを抑え、また汎用性あるプレス装置で製造できるので加工コストも抑えることができ、製造にかかるコストを大幅に低減できる。   Furthermore, since the inner shaft 11 is manufactured from the metal pipe 31, the material cost can be suppressed, and since it can be manufactured by a versatile press apparatus, the processing cost can be suppressed and the manufacturing cost can be greatly reduced.

しかも、一端から他端まで全体が中空であるので、軽量化も図れ、低燃費化にも資する。   Moreover, since the entire body is hollow from one end to the other end, the weight can be reduced and the fuel consumption can be reduced.

この発明の構成と、前記一形態の構成との対応において、
この発明の第１工程の金型は、第１金型４１、第２金型５１に対応し、
以下同様に、
第１工程のパンチは、第１パンチ４２、第２パンチ５２に対応し、
第２工程の金型は、第３金型６１に対応し、
第２工程のパンチは、第３パンチ６２に対応するも、
この発明は、前記の構成のみに限定されるものではなく、その他の形態を採用することもできる。 In correspondence between the configuration of the present invention and the configuration of the one aspect,
The mold of the first step of this invention corresponds to the first mold 41 and the second mold 51,
Similarly,
The punch in the first step corresponds to the first punch 42 and the second punch 52,
The mold in the second step corresponds to the third mold 61,
The punch in the second step corresponds to the third punch 62,
The present invention is not limited to the above-described configuration, and other forms can be adopted.

たとえば、第１工程は、２段階のほか、１段階あるいは３段階以上で加工することもできる。   For example, the first step can be processed in one step or three or more steps in addition to two steps.

また、転動溝は２本以外であるもよい。   Further, the number of rolling grooves may be other than two.

１１…伸縮自在シャフトの内軸
１５…転動溝
１６…貫通孔
２１…転動体
３１…金属パイプ
３２…ワーク
４１…第１金型
４２…第１パンチ
５１…第２金型
５２…第２パンチ
６１…第３金型
６２…第３パンチ DESCRIPTION OF SYMBOLS 11 ... Inner shaft of a telescopic shaft 15 ... Rolling groove 16 ... Through-hole 21 ... Rolling body 31 ... Metal pipe 32 ... Work piece 41 ... 1st metal mold | die 42 ... 1st punch 51 ... 2nd metal mold 52 ... 2nd punch 61 ... Third mold 62 ... Third punch

Claims (2)

転動体を転動可能に保持するため長手方向に沿って延びる転動溝を外周面に有し、長手方向に相対移動可能で、且つトルク伝達可能に、筒状の外軸に対して挿入される伸縮自在シャフトの内軸の製造方法であって、
金属パイプにおける前記転動溝を形成する部分を金型とパンチを用いて絞り加工して前記転動溝を有する外周面を形成する第１工程と、
該第１工程の終了後のワークに、金型と、前記ワーク内に加圧挿入されるパンチとを用いて拡管加工して内周面を成形する第２工程とを備える
伸縮自在シャフトの内軸の製造方法。 In order to hold the rolling element in a rollable manner, the outer circumferential surface has a rolling groove extending along the longitudinal direction, and is inserted into the cylindrical outer shaft so as to be relatively movable in the longitudinal direction and transmit torque. A method for manufacturing the inner shaft of a telescopic shaft,
A first step of forming an outer peripheral surface having the rolling groove by drawing a portion of the metal pipe that forms the rolling groove using a mold and a punch;
An inside of a telescopic shaft comprising a second step of forming an inner peripheral surface by expanding a tube using a die and a punch press-inserted into the workpiece into the workpiece after completion of the first step. Shaft manufacturing method. 転動体を転動可能に保持するため長手方向に沿って延びる転動溝を外周面に有し、長手方向に相対移動可能で、且つトルク伝達可能に、筒状の外軸に対して挿入される伸縮自在シャフトの内軸であって、
一端から他端まで中空に形成された
伸縮自在シャフトの内軸。 In order to hold the rolling element in a rollable manner, the outer circumferential surface has a rolling groove extending along the longitudinal direction, and is inserted into the cylindrical outer shaft so as to be relatively movable in the longitudinal direction and transmit torque. The inner shaft of the telescopic shaft,
An inner shaft of a telescopic shaft formed hollow from one end to the other end.
JP2010195361A 2010-09-01 2010-09-01 Inner shaft of telescopic shaft and method of manufacturing the same Pending JP2012051002A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003172372A (en) * 2001-11-29 2003-06-20 Gkn Loebro Gmbh Longitudinal direction insertion unit
JP2003311366A (en) * 2002-04-22 2003-11-05 Matsuoka Minako Method for manufacturing hollow rack member
EP1375943A1 (en) * 2002-06-18 2004-01-02 Dana Corporation Rolling ball slip joint formed from two tubular members

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003172372A (en) * 2001-11-29 2003-06-20 Gkn Loebro Gmbh Longitudinal direction insertion unit
JP2003311366A (en) * 2002-04-22 2003-11-05 Matsuoka Minako Method for manufacturing hollow rack member
EP1375943A1 (en) * 2002-06-18 2004-01-02 Dana Corporation Rolling ball slip joint formed from two tubular members

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