JP2003207031A - Toothed gear, reduction gear mechanism and electric power steering device - Google Patents
Toothed gear, reduction gear mechanism and electric power steering deviceInfo
- Publication number
- JP2003207031A JP2003207031A JP2002005366A JP2002005366A JP2003207031A JP 2003207031 A JP2003207031 A JP 2003207031A JP 2002005366 A JP2002005366 A JP 2002005366A JP 2002005366 A JP2002005366 A JP 2002005366A JP 2003207031 A JP2003207031 A JP 2003207031A
- Authority
- JP
- Japan
- Prior art keywords
- tooth
- worm
- groove
- tooth surface
- lubricant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は歯車、該歯車を備え
る減速歯車機構及び該減速歯車機構を備え、操舵補助力
の発生源としてモータを用いてなる電動式パワーステア
リング装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear, a reduction gear mechanism including the gear, and an electric power steering apparatus including the reduction gear mechanism and a motor as a source of a steering assist force.
【０００２】[0002]
【従来の技術】従来の電動式パワーステアリング装置の
多くは、ウォーム及びウォームホイールよりなる減速歯
車機構を採用し、ウォーム及びウォームホイールの歯に
は、歯面の摩耗を抑制するために粘性が高いグリース等
の潤滑剤を塗布している。2. Description of the Related Art Many conventional electric power steering devices employ a reduction gear mechanism composed of a worm and a worm wheel, and the teeth of the worm and the worm wheel have high viscosity in order to suppress wear of the tooth surface. A lubricant such as grease is applied.
【０００３】ところが、操舵補助用モータの回転がウォ
ームからウォームホイールへ伝動されるとき、ウォーム
及びウォームホイールの歯面は、ピッチ円近傍の中央部
同士が圧接されることになる。この結果、ピッチ円近傍
の中央部に塗布されていた潤滑剤が、前記中央部から歯
先側及び歯底側へと掻き出され、１回転した後で歯面同
士が再び接触するときにはピッチ円近傍の中央部に潤滑
剤が殆どなくなっており、潤滑剤が不足する状態でピッ
チ円近傍の中央部同士が圧接されることになり、このピ
ッチ円近傍の中央部が摩耗し易くなるという問題があっ
た。However, when the rotation of the steering assisting motor is transmitted from the worm to the worm wheel, the tooth surfaces of the worm and the worm wheel are in pressure contact with each other in the central portions in the vicinity of the pitch circle. As a result, the lubricant applied to the central portion in the vicinity of the pitch circle is scraped out from the central portion to the tooth tip side and the tooth bottom side, and when the tooth surfaces come into contact again after one rotation, the pitch circle is Since there is almost no lubricant in the central portion in the vicinity, and the central portions in the vicinity of the pitch circle are pressed against each other in the state where the lubricant is insufficient, there is a problem that the central portion in the vicinity of the pitch circle is easily worn. there were.
【０００４】上述の問題点を解決するために、特開平８
−２２６５２６号にて開示されているウォーム減速装置
では、少なくともウォーム及びウォームホイールの何れ
か一方の歯面に、互いに接触する接触範囲内、換言すれ
ばピッチ円近傍の中央部において、微細で円形の潤滑剤
溜り部を多数凹設している。この潤滑剤溜り部に潤滑剤
を保持し、互いに接触する接触面の潤滑性を高め、歯面
の摩耗を抑制するように構成されている。In order to solve the above-mentioned problems, Japanese Unexamined Patent Application Publication No. Hei 8 (1998)
In the worm speed reducer disclosed in Japanese Patent No. 226526, at least one of the tooth surfaces of the worm and the worm wheel has a fine and circular shape in the contact range in which they contact each other, in other words, in the central portion near the pitch circle. Many lubricant reservoirs are recessed. The lubricant is retained in the lubricant reservoir, the lubricity of the contact surfaces in contact with each other is improved, and the wear of the tooth surface is suppressed.
【０００５】[0005]
【発明が解決しようとする課題】ところが、特開平８−
２２６５２６号のように、ピッチ円近傍の中央部に潤滑
剤溜り部が設けられている場合、潤滑剤溜り部が設けら
れていない一般のウォーム及び／又はウォームホイール
に比較してピッチ円近傍の中央部での接触面積が減少す
ることになる。この結果、電動式パワーステアリング装
置の場合では、操舵補助用のモータの発生トルクが大き
くなり、ウォーム及びウォームホイールにおける歯面同
士の面圧が繰り返し高くなるとき、ピッチ円近傍の中央
部の摩耗が促進される。However, Japanese Unexamined Patent Publication No. 8-
As in No. 226526, when a lubricant reservoir is provided in the center near the pitch circle, compared to a general worm and / or worm wheel in which the lubricant reservoir is not provided, the center near the pitch circle. The contact area in the area will be reduced. As a result, in the case of the electric power steering device, when the torque generated by the motor for steering assistance increases and the surface pressure between the tooth surfaces of the worm and the worm wheel repeatedly increases, the wear of the central portion near the pitch circle occurs. Be promoted.
【０００６】本発明は斯かる事情に鑑みてなされたもの
であり、潤滑剤保持用の凹みに潤滑剤を保持することが
できるようにしてある歯面の摩耗を抑制することができ
る歯車、減速歯車機構及び電動式パワーステアリング装
置を提供することを目的とする。The present invention has been made in view of such circumstances, and a gear capable of holding a lubricant in a recess for holding a lubricant and suppressing wear of a tooth surface, and a reduction gear An object of the present invention is to provide a gear mechanism and an electric power steering device.
【０００７】[0007]
【課題を解決するための手段】第１発明に係る歯車は、
ピッチ円近傍の中央部と歯底との間の歯面及び／又は前
記中央部と歯先との間の歯面に溝を有することを特徴と
する。A gear according to the first invention is
A groove is provided on the tooth surface between the central portion near the pitch circle and the tooth bottom and / or the tooth surface between the central portion and the tooth tip.
【０００８】第１発明にあっては、予め歯に塗布された
潤滑剤の一部が歯面の溝に入り、該溝に潤滑剤が保持さ
れ、しかも、溝はピッチ円近傍の中央部を除いた歯面に
設けられているため、歯車同士の噛合によってピッチ円
近傍の中央部同士が圧接されるとき、遠心力によって溝
内の潤滑剤の一部を歯面全体に供給し、このためピッチ
円近傍の中央部にも供給することができ、ピッチ円近傍
の中央部の潤滑性を良好にでき、前記中央部を含む歯面
の摩耗を低減でき、耐久性を高めることができる。In the first invention, a part of the lubricant applied to the teeth in advance enters the groove on the tooth surface, the lubricant is retained in the groove, and the groove is formed in the central portion near the pitch circle. Since it is provided on the removed tooth surface, when the center parts near the pitch circle are pressed against each other due to the meshing of the gears, a part of the lubricant in the groove is supplied to the entire tooth surface by centrifugal force. It can be supplied also to the central portion in the vicinity of the pitch circle, the lubricity of the central portion in the vicinity of the pitch circle can be improved, the wear of the tooth surface including the central portion can be reduced, and the durability can be improved.
【０００９】また、溝であるため、溝が容易に形成さ
れ、溝を有する割にコストを低減できる。Further, since it is a groove, the groove can be easily formed, and the cost can be reduced despite having the groove.
【００１０】第２発明に係る歯車は、前記溝を歯すじ方
向の両端に亘って有することを特徴とする。第２発明に
あっては、歯車を回転させるか、又は、切削工具を歯す
じ方向へ移動させることにより歯すじ方向の両端に亘っ
て溝が形成されるため、溝を有する割にコストをより一
層低減できる。A gear according to a second aspect of the invention is characterized in that the groove is provided at both ends in the tooth trace direction. In the second aspect of the invention, since the groove is formed over both ends in the tooth trace direction by rotating the gear or moving the cutting tool in the tooth trace direction, it is possible to reduce the cost even if the groove is provided. It can be further reduced.
【００１１】第３発明に係る減速歯車機構は、請求項１
又は２に記載された歯車を備えることを特徴とする。第
３発明にあっては、予め歯に塗布された潤滑剤の一部が
歯面の溝に入り、該溝に潤滑剤が保持され、しかも、歯
車同士の噛合によってピッチ円近傍の中央部同士が圧接
されるとき、遠心力によって溝内の潤滑剤の一部を歯面
全体に供給し、このためピッチ円近傍の中央部にも供給
することができ、ピッチ円近傍の中央部の潤滑性を良好
にでき、ピッチ円近傍の中央部の摩耗を低減でき、耐久
性を高めることができる。A reduction gear mechanism according to a third aspect of the present invention is the first aspect of the present invention.
Alternatively, it is provided with the gear described in 2. In the third invention, a part of the lubricant applied to the teeth in advance enters the groove of the tooth surface, the lubricant is retained in the groove, and the gears are meshed with each other so that the central portions in the vicinity of the pitch circles are in contact with each other. When pressure is applied, part of the lubricant in the groove can be supplied to the entire tooth surface by centrifugal force, and therefore it can be supplied to the central part near the pitch circle as well. Can be improved, wear of the central portion near the pitch circle can be reduced, and durability can be improved.
【００１２】第４発明に係る減速歯車機構は、ウォーム
と、該ウォームに噛合するウォームホイールとを備える
減速歯車機構において、前記ウォーム及び／又はウォー
ムホイールは請求項１に記載された歯車であることを特
徴とする。A reduction gear mechanism according to a fourth aspect of the present invention is a reduction gear mechanism including a worm and a worm wheel meshing with the worm, wherein the worm and / or the worm wheel is the gear according to claim 1. Is characterized by.
【００１３】第４発明にあっては、例えばウォームに溝
が設けられている場合、ウォームが回転するとき、溝の
長手方向両端からの潤滑剤洩れ量を抑制でき、歯面の間
の潤滑性を良好にでき、歯面の摩耗を低減できる。According to the fourth aspect of the invention, for example, when the worm is provided with a groove, when the worm rotates, the amount of lubricant leakage from both longitudinal ends of the groove can be suppressed, and the lubricity between the tooth surfaces can be reduced. Can be improved and wear of the tooth surface can be reduced.
【００１４】第５発明に係る電動式パワーステアリング
装置は、請求項４に記載された減速歯車機構と、該減速
歯車機構のウォームに連結された操舵補助用のモータ
と、該モータの回転に伴うウォームホイールの回転力を
舵取機構に伝動する伝動手段とを備えることを特徴とす
る。An electric power steering apparatus according to a fifth aspect of the present invention includes a reduction gear mechanism according to claim 4, a steering assisting motor connected to a worm of the reduction gear mechanism, and rotation of the motor. And a transmission means for transmitting the rotational force of the worm wheel to the steering mechanism.
【００１５】第５発明にあっては、モータの回転がウォ
ームからウォームホイールへ伝達され、夫々の歯面にお
けるピッチ円近傍の中央部同士が圧接されるとき、遠心
力によって溝内の潤滑剤の一部を歯面全体に供給し、こ
のためピッチ円近傍の中央部にも供給することができ、
ピッチ円近傍の中央部の潤滑性を良好にでき、ピッチ円
近傍の中央部の摩耗を低減でき、耐久性を高めることが
できる。また、溝は歯すじ方向に長いため、ウォームに
あっては、該ウォームを回転させつつ切削工具によって
前記溝が容易に形成され、溝を有する割にコストを低減
できる。According to the fifth aspect of the invention, when the rotation of the motor is transmitted from the worm to the worm wheel and the central portions of the respective tooth surfaces in the vicinity of the pitch circle are pressed against each other, centrifugal force causes the lubricant in the groove to move. A part of it can be supplied to the entire tooth surface, so it can also be supplied to the central part near the pitch circle,
Lubricity of the central portion near the pitch circle can be improved, wear of the central portion near the pitch circle can be reduced, and durability can be improved. Further, since the groove is long in the tooth trace direction, in the worm, the groove can be easily formed by the cutting tool while rotating the worm, and the cost can be reduced even if the groove is provided.
【００１６】[0016]
【発明の実施の形態】以下本発明をその実施の形態を示
す図面に基づいて詳述する。
実施の形態１
図１は本発明に係る歯車の実施の形態１の構成を示す正
面図である。また、図２は本発明に係る歯車の要部を拡
大したもので、(a) は正面図、(b) は歯の断面図であ
る。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the drawings showing the embodiments thereof. Embodiment 1 FIG. 1 is a front view showing the configuration of Embodiment 1 of the gear according to the present invention. 2 is an enlarged view of a main part of the gear according to the present invention, (a) is a front view and (b) is a sectional view of teeth.
【００１７】歯車は直円柱部材の外周を例えばホブによ
ってホブ切りすることにより複数の歯１１（例えば２条
の歯）を有する歯部１ａが形成されたウォーム１であ
り、両端には軸部１ｂ，１ｃを有する。このウォーム１
における歯１１の両側の歯面１２には、潤滑剤を保持さ
せるべき溝２が歯すじ方向へ長くなるように設けられて
いる。The gear is a worm 1 in which a tooth portion 1a having a plurality of teeth 11 (for example, two teeth) is formed by hobbing the outer periphery of a right circular cylinder member with a hob, for example, and a shaft portion 1b is provided at both ends. , 1c. This warm 1
Grooves 2 for holding a lubricant are provided on the tooth surfaces 12 on both sides of the tooth 11 so as to be elongated in the tooth trace direction.
【００１８】この溝２はピッチ円Ｐｗ近傍の中央部１２
ａと歯底１３との間の歯面１２及び前記中央部１２ａと
歯先１４との間の歯面１２（図２のa ，b 参照）に、歯
すじ方向の両端に亘って螺旋形に設けられる。尚、溝２
はピッチ円Ｐｗ近傍の中央部１２ａと歯底１３との間の
歯面１２、又は、前記中央部１２ａと歯先１４との間の
歯面１２にだけ設けてもよい。The groove 2 has a central portion 12 near the pitch circle Pw.
On the tooth surface 12 between a and the tooth bottom 13 and the tooth surface 12 between the central portion 12a and the tooth tip 14 (see a and b in FIG. 2), a spiral shape is formed over both ends in the tooth trace direction. It is provided. Incidentally, the groove 2
May be provided only on the tooth surface 12 between the central portion 12a near the pitch circle Pw and the tooth bottom 13, or on the tooth surface 12 between the central portion 12a and the tooth tip 14.
【００１９】また、溝２はホブによって歯１１が形成さ
れた後、例えばウォームを回転させつつ切削加工によっ
て形成、又は、放電加工等によって形成される。また、
溝２は例えば幅が約０．０６mm、深さが約０．０６mm程
度の大きさに形成されている。After the teeth 11 are formed by the hob, the groove 2 is formed by cutting while rotating a worm, or by electric discharge machining or the like. Also,
The groove 2 is formed to have a width of about 0.06 mm and a depth of about 0.06 mm, for example.
【００２０】以上のように構成された歯車は、減速歯車
機構Ａのウォームとして使用される。図３は減速歯車機
構の構成を示す断面図である。この減速歯車機構Ａはウ
ォーム１と、該ウォーム１の歯１１に噛合し、その中心
部の嵌合孔３ａが回転軸４に嵌合固定されたウォームホ
イール３と、前記ウォーム１の歯部１ａの両端に連なる
軸部１ｂ，１ｃに嵌合された軸受５，６と、該軸受５，
６を介して前記ウォーム１を回転可能に支持したハウジ
ング７とを備えており、一方の軸部１ｃに軸継手８を介
して継合されるモータ９の回転を減速してウォームホイ
ール３に伝達し、回転軸４を回転させるように構成され
ている。The gear configured as described above is used as a worm of the reduction gear mechanism A. FIG. 3 is a sectional view showing the structure of the reduction gear mechanism. The reduction gear mechanism A includes a worm 1, a worm wheel 3 that meshes with a tooth 11 of the worm 1, and a fitting hole 3a at the center thereof is fitted and fixed to a rotating shaft 4, and a tooth portion 1a of the worm 1. Bearings 5, 6 fitted to the shaft portions 1b, 1c connected to both ends of
And a housing 7 that rotatably supports the worm 1 via 6, and the rotation of a motor 9 joined to one shaft portion 1c via a shaft coupling 8 is reduced and transmitted to the worm wheel 3. Then, the rotary shaft 4 is rotated.
【００２１】このように構成された減速歯車機構Ａは、
例えば電動式パワーステアリング装置に使用される。図
４は本発明に係る電動式パワーステアリング装置の構成
を示す断面図である。The speed reduction gear mechanism A constructed in this way is
For example, it is used in an electric power steering device. FIG. 4 is a sectional view showing the configuration of the electric power steering device according to the present invention.
【００２２】電動式パワーステアリング装置は、上端が
舵取りのための操舵輪１０に繋がり、下端に筒部を有す
る入力軸２０と、前記筒部内に挿入されてその上端が前
記入力軸２０の筒部に同軸的に連結され、前記操舵輪１
０に加わる操舵トルクの作用によって捩れるトーション
バー２１と、下端が前記トーションバー２１の下端に同
軸的に連結される出力軸２２と、前記トーションバー２
１の捩れに応じた入力軸２０及び出力軸２２の相対回転
変位量によって前記操舵輪１０に加わる操舵トルクを検
出するトルクセンサ２３と、該トルクセンサ２３が検出
したトルク、車速、操舵輪１０の舵角等に基づいて駆動
される操舵補助用の前記モータ９と、該モータ９の回転
に連動し、該回転を減速して出力軸２２に伝動する前記
減速歯車機構Ａと、前記トルクセンサ２３及び前記減速
歯車機構Ａが収容された前記ハウジング７とを備え、こ
のハウジング７に前記モータ９が取付けられている。
尚、出力軸２２が前記回転軸４を構成している。The electric power steering apparatus has an upper end connected to the steered wheels 10 for steering and an input shaft 20 having a cylindrical portion at the lower end, and an upper end of the input shaft 20 inserted into the cylindrical portion of the input shaft 20. Is coaxially connected to the steering wheel 1
A torsion bar 21 which is twisted by the action of a steering torque applied to 0, an output shaft 22 whose lower end is coaxially connected to the lower end of the torsion bar 21, and the torsion bar 2
The torque sensor 23 that detects the steering torque applied to the steered wheel 10 by the relative rotational displacement amount of the input shaft 20 and the output shaft 22 according to the twist of No. 1, and the torque detected by the torque sensor 23, the vehicle speed, and the steered wheel 10. The steering assisting motor 9 driven based on the steering angle, the reduction gear mechanism A that is interlocked with the rotation of the motor 9 to reduce the rotation and transmit the rotation to the output shaft 22, and the torque sensor 23. And the housing 7 in which the reduction gear mechanism A is housed, and the motor 9 is attached to the housing 7.
The output shaft 22 constitutes the rotary shaft 4.
【００２３】減速歯車機構Ａは、ウォーム１の軸部１ｃ
が前記モータ９の駆動軸９ａに繋がっており、また、ウ
ォームホイール３が前記出力軸２２の中間に嵌合固定さ
れており、これらウォーム１及びウォームホイール３の
噛合により前記駆動軸９ａの回転を減速して出力軸２２
に伝動し、該出力軸２２からユニバーサルジョイントを
経て例えばラックピニオン式の舵取機構（図示せず）へ
伝達するようにしている。尚、出力軸２２及びユニバー
サルジョイントが、ウォームホイール３の回転力を舵取
機構に伝達する伝達手段を構成している。The reduction gear mechanism A includes a shaft portion 1c of the worm 1.
Is connected to the drive shaft 9a of the motor 9, and the worm wheel 3 is fitted and fixed in the middle of the output shaft 22. The engagement of the worm 1 and the worm wheel 3 prevents the drive shaft 9a from rotating. Decelerate to output shaft 22
And is transmitted from the output shaft 22 to a rack and pinion type steering mechanism (not shown) via a universal joint. The output shaft 22 and the universal joint form a transmission unit that transmits the rotational force of the worm wheel 3 to the steering mechanism.
【００２４】以上の如く構成された減速歯車機構Ａ、電
動式パワーステアリング装置において、ウォーム１にお
けるピッチ円Ｐｗ近傍の中央部１２ａと歯底１３との間
の歯面１２及び／又は前記中央部１２ａと歯先１４との
間の歯面１２には、歯すじ方向に長い溝２が設けられて
いるため、ウォーム１及びウォームホイール３の歯１
１，３１に予め塗布されているグリース等の潤滑剤が溝
２に保持されている。この結果、モータ９の回転によっ
てウォーム１の歯面１２におけるピッチ円Ｐｗ近傍の中
央部１２ａと、ウォームホイール３の歯面３２における
ピッチ円Ｐｈ近傍の中央部３２ａとが圧接され、この中
央部１２ａ，３２ａ同士の圧接によって前記塗布されて
いる潤滑剤が前記中央部１２ａ，３２ａから歯底１３側
及び歯先１４側へと掻き出されたとき、溝２に保持され
ている潤滑剤の一部は遠心力によってピッチ円Ｐｗ，Ｐ
ｈ近傍の中央部１２ａ，３２ａに供給されることにな
り、この溝２から供給された潤滑剤によってピッチ円Ｐ
ｗ，Ｐｈ近傍の中央部１２ａ，３２ａの潤滑性を高める
ことができ、該中央部１２ａ，３２ａを含めた歯面１
２，３２の摩耗を低減できる。尚、歯１１，３１の噛合
関係が変わることにより圧接状態の歯面１２，３２が非
圧接状態になったとき、歯面１２，３２同士の圧接によ
ってピッチ円Ｐｗ，Ｐｈ近傍の中央部１２ａ，３２ａか
ら歯底１３側及び歯先１４側へと掻き出されていた潤滑
剤がその粘性によって溝２に戻ることになり、該溝２に
潤滑剤が補充される。In the reduction gear mechanism A and the electric power steering apparatus configured as described above, the tooth surface 12 between the central portion 12a and the tooth bottom 13 near the pitch circle Pw of the worm 1 and / or the central portion 12a. Since the groove 2 that is long in the tooth trace direction is provided on the tooth surface 12 between the tooth tip 14 and the tooth tip 14, the tooth 1 of the worm 1 and the worm wheel 3 is provided.
A lubricant such as grease applied in advance to 1, 31 is held in the groove 2. As a result, the central portion 12a of the tooth surface 12 of the worm 1 in the vicinity of the pitch circle Pw and the central portion 32a of the tooth surface 32 of the worm wheel 3 in the vicinity of the pitch circle Ph are pressed by the rotation of the motor 9, and the central portion 12a. A part of the lubricant retained in the groove 2 when the applied lubricant is scraped out from the central portions 12a and 32a toward the tooth bottom 13 side and the tooth tip 14 side by the pressure contact between the first and second teeth 32a. Is a pitch circle Pw, P due to centrifugal force
The lubricant is supplied to the central portions 12a and 32a near h, and the pitch circle P is generated by the lubricant supplied from the groove 2.
The lubricity of the central portions 12a and 32a near w and Ph can be enhanced, and the tooth surface 1 including the central portions 12a and 32a
The wear of 2, 32 can be reduced. When the tooth surfaces 12 and 32 in the pressure contact state are brought into a non-pressure contact state due to the change in the meshing relationship between the teeth 11 and 31, the tooth surfaces 12 and 32 are in pressure contact with each other, and the central portion 12a near the pitch circles Pw and Ph The lubricant scraped from 32a to the tooth bottom 13 side and the tooth tip 14 side returns to the groove 2 due to its viscosity, and the groove 2 is replenished with the lubricant.
【００２５】また、溝２はウォーム１を回転させつつ切
削工具によって歯すじ方向の両端に亘って簡易に設ける
ことができるため、溝２を有する割にコストを低減でき
る。Further, since the groove 2 can be easily provided over the both ends in the tooth trace direction by the cutting tool while rotating the worm 1, the cost can be reduced even if the groove 2 is provided.
【００２６】実施の形態２
図５は本発明に係る歯車の実施の形態２の構成を示す部
分拡大断面図である。実施の形態２の歯車は、ウォーム
１の歯面１２に溝２を設ける代わりに、ウォームホイー
ル３の歯面３２に、歯すじ方向に長い前記溝２を設けた
ものである。Embodiment 2 FIG. 5 is a partially enlarged sectional view showing the structure of Embodiment 2 of the gear according to the present invention. In the gear of the second embodiment, instead of providing the groove 2 on the tooth surface 12 of the worm 1, the tooth surface 32 of the worm wheel 3 is provided with the groove 2 long in the tooth trace direction.
【００２７】この実施の形態２においては、ウォームホ
イール３におけるピッチ円Ｐｈ近傍の中央部３２ａと歯
底３３との間の歯面３２及び前記中央部３２ａと歯先３
４との間の歯面３２に、歯すじ方向の両端に亘って前記
溝２が設けられる。尚、この実施の形態２においても前
記溝２は、前記中央部３２ａと歯底３３との間の歯面３
２、又は、前記中央部３２ａと歯先３４との間の歯面３
２にだけ設けてもよい。In the second embodiment, the tooth surface 32 between the central portion 32a near the pitch circle Ph of the worm wheel 3 and the tooth bottom 33, the central portion 32a and the tooth tip 3 are provided.
The groove 2 is provided on the tooth flank 32 between the groove 2 and the tooth flank 4. Also in the second embodiment, the groove 2 has the tooth surface 3 between the central portion 32a and the tooth bottom 33.
2 or the tooth surface 3 between the central portion 32a and the tooth tip 34
It may be provided only in 2.
【００２８】その他の構成及び作用は実施の形態１と同
様であるため、その構成の詳細な説明及び作用効果の説
明を省略する。Since the other structure and operation are the same as those of the first embodiment, detailed description of the structure and operation and effect will be omitted.
【００２９】尚、以上説明した実施の形態では、ウォー
ム１の歯面１２、又は、ウォームホイール３の歯面３２
に溝２が設けられた構成としたが、その他、ウォーム１
の歯面１２及びウォームホイール３の歯面３２に溝２が
設けられた構成としてもよい。In the embodiment described above, the tooth surface 12 of the worm 1 or the tooth surface 32 of the worm wheel 3 is used.
Although the groove 2 is provided in the
The groove 2 may be provided on the tooth surface 12 of the worm wheel 3 and the tooth surface 32 of the worm wheel 3.
【００３０】また、以上説明した実施の形態では、歯１
１、３１の歯すじ方向に長い溝２を設けたが、その他、
この溝２は歯すじ方向に対して傾斜した溝、換言すれば
ほぼ歯すじ方向に長い溝であってもよい。Further, in the embodiment described above, the tooth 1
The long groove 2 is provided in the tooth trace direction of 1 and 31, but in addition,
The groove 2 may be a groove inclined with respect to the tooth trace direction, in other words, a groove that is long in the tooth trace direction.
【００３１】また、実施の形態２のように歯面３２に溝
２が設けられたウォームホイール３は、全体が金属材料
で形成されているが、その他、比較的剛性が高い合成樹
脂材料で形成されてもよい。この場合、例えば外周に歯
を有する合成樹脂製の環状歯体と、該環状歯体の内側に
嵌合された金属製の芯体とを備えた構成としてもよい。Further, the worm wheel 3 having the groove 2 on the tooth surface 32 as in the second embodiment is entirely made of a metal material, but is made of a synthetic resin material having a relatively high rigidity. May be done. In this case, for example, a synthetic resin ring-shaped toothed body having teeth on the outer periphery and a metal cored body fitted inside the ring-shaped toothed body may be provided.
【００３２】また、以上説明した実施の形態の減速歯車
機構Ａは、ウォーム１及びウォームホイール３を備えた
ウォーム歯車である他、ハイポイドピニオン及びハイポ
イドホイールを備えたハイポイド歯車であってもよい。
さらに、減速歯車機構はベベルギヤであってもよい。Further, the reduction gear mechanism A of the embodiment described above is not only a worm gear including the worm 1 and the worm wheel 3 but also a hypoid gear including a hypoid pinion and a hypoid wheel.
Further, the reduction gear mechanism may be a bevel gear.
【００３３】[0033]
【発明の効果】第１発明、第３発明、第４発明及び第５
発明によれば、ピッチ円近傍の中央部の潤滑性を溝によ
って良好にでき、前記中央部を含む歯面の摩耗を低減で
き、耐久性を高めることができる。しかも、溝を有する
割にコストを低減できる。EFFECTS OF THE INVENTION First invention, third invention, fourth invention and fifth invention
According to the invention, the lubricity of the central portion in the vicinity of the pitch circle can be improved by the groove, the wear of the tooth surface including the central portion can be reduced, and the durability can be enhanced. Moreover, the cost can be reduced in spite of having the groove.
【００３４】第２発明によれば、溝を有する割にコスト
をより一層低減できる。According to the second aspect of the invention, the cost can be further reduced in spite of having the groove.
【図１】本発明に係る歯車の実施の形態１の構成を示す
正面図である。FIG. 1 is a front view showing a configuration of a first embodiment of a gear according to the present invention.
【図２】本発明に係る歯車の実施の形態１の要部を拡大
したもので、(a) は正面図、(b) は歯の断面図である。FIG. 2 is an enlarged view of a main part of a first embodiment of a gear according to the present invention, in which (a) is a front view and (b) is a sectional view of teeth.
【図３】本発明に係る減速歯車機構の構成を示す断面図
である。FIG. 3 is a sectional view showing a configuration of a reduction gear mechanism according to the present invention.
【図４】本発明に係る電動式パワーステアリング装置の
構成を示す断面図である。FIG. 4 is a sectional view showing a configuration of an electric power steering apparatus according to the present invention.
【図５】本発明に係る歯車の実施の形態２の構成を示す
部分拡大断面図である。FIG. 5 is a partially enlarged cross-sectional view showing the configuration of the second embodiment of the gear according to the present invention.
１ ウォーム（歯車） １１ 歯 １２ 歯面 １２ａ 中央部 １３ 歯底 １４ 歯先 ２ 溝 ３ ウォームホイール（歯車） ３１ 歯 ３２ 歯面 ３２ａ 中央部 ３３ 歯底 ３４ 歯先 ９ モータ ２２ 出力軸（伝達手段） Ａ 減速歯車機構 Ｐｗ，Ｐｈ ピッチ円 1 worm (gear) 11 teeth 12 Tooth surface 12a central part 13 Root 14 Tooth tip 2 grooves 3 Worm wheel (gear) 31 teeth 32 tooth flank 32a central part 33 root 34 Tooth tip 9 motors 22 Output shaft (transmitting means) A reduction gear mechanism Pw, Ph pitch circle
───────────────────────────────────────────────────── フロントページの続き (72)発明者 瀧本 学 大阪府大阪市中央区南船場三丁目５番８号 光洋精工株式会社内 Ｆターム(参考） 3D033 CA04 3J009 DA15 EA06 EA19 EA23 EA32 EB02 FA08 3J030 AC01 BA03 BB09 CA10 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Takimoto Manabu 3-5-8 Minamisenba, Chuo-ku, Osaka-shi, Osaka Koyo Seiko Co., Ltd. F-term (reference) 3D033 CA04 3J009 DA15 EA06 EA19 EA23 EA32 EB02 FA08 3J030 AC01 BA03 BB09 CA10
Claims (5)
面及び／又は前記中央部と歯先との間の歯面に溝を有す
ることを特徴とする歯車。1. A gear having a groove on a tooth surface between a central portion near a pitch circle and a tooth bottom and / or a tooth surface between the central portion and a tooth tip.
る請求項１記載の歯車。2. The gear according to claim 1, wherein the groove is provided at both ends in the tooth trace direction.
ることを特徴とする減速歯車機構。3. A reduction gear mechanism, comprising the gear according to claim 1 or 2.
ームホイールとを備える減速歯車機構において、前記ウ
ォーム及び／又はウォームホイールは請求項１又は２に
記載された歯車であることを特徴とする減速歯車機構。4. A reduction gear mechanism including a worm and a worm wheel meshing with the worm, wherein the worm and / or the worm wheel is the gear according to claim 1 or 2. mechanism.
該減速歯車機構のウォームに連結された操舵補助用のモ
ータと、該モータの回転に伴うウォームホイールの回転
力を舵取機構に伝達する伝達手段とを備えることを特徴
とする電動式パワーステアリング装置。5. A reduction gear mechanism according to claim 4,
An electric power steering apparatus comprising: a steering assisting motor connected to the worm of the reduction gear mechanism; and a transmission means for transmitting the rotational force of the worm wheel accompanying the rotation of the motor to the steering mechanism. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002005366A JP4078842B2 (en) | 2002-01-11 | 2002-01-11 | Reduction gear mechanism and electric power steering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002005366A JP4078842B2 (en) | 2002-01-11 | 2002-01-11 | Reduction gear mechanism and electric power steering device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003207031A true JP2003207031A (en) | 2003-07-25 |
| JP4078842B2 JP4078842B2 (en) | 2008-04-23 |
Family
ID=27644433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002005366A Expired - Fee Related JP4078842B2 (en) | 2002-01-11 | 2002-01-11 | Reduction gear mechanism and electric power steering device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4078842B2 (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005201375A (en) * | 2004-01-15 | 2005-07-28 | Enplas Corp | Worm wheel |
| WO2006011534A1 (en) * | 2004-07-27 | 2006-02-02 | Nsk Ltd. | Speed-reduction gear |
| WO2006057414A1 (en) * | 2004-11-29 | 2006-06-01 | Nsk Ltd. | Method of producing toothed transmission member having oil holders and toothed transmission member produced by the method |
| JP2007155120A (en) * | 2005-11-14 | 2007-06-21 | Nsk Ltd | Oil reservoir forming method for lubricating mechanical element, lubricating mechanical element, pinion, gear, rack, screw shaft, spline shaft and steering device |
| JP2007292179A (en) * | 2006-04-25 | 2007-11-08 | Kayaba Ind Co Ltd | Worm, reduction gear, and electric power steering device |
| EP1767818A3 (en) * | 2005-09-26 | 2010-06-23 | Robert Bosch Gmbh | Toothed wheel |
| JP2011052782A (en) * | 2009-09-03 | 2011-03-17 | Shin Kobe Electric Mach Co Ltd | Resin gear |
| JP2011185370A (en) * | 2010-03-09 | 2011-09-22 | Toshiba Corp | Worm gear |
| AU2006203631B2 (en) * | 2005-08-23 | 2012-06-14 | Sandvik Mining And Construction Australia (Production/Supply) Pty Ltd | Lubrication means for a spline |
| JP2012163179A (en) * | 2011-02-08 | 2012-08-30 | Jtekt Corp | Speed reduction mechanism and electric power steering device |
| CN103244651A (en) * | 2012-02-07 | 2013-08-14 | 株式会社捷太格特 | Worm wheel |
| JP2013155801A (en) * | 2012-01-30 | 2013-08-15 | Aisin Seiki Co Ltd | Face gear and gear device |
| WO2016104812A1 (en) * | 2014-12-26 | 2016-06-30 | 協同油脂株式会社 | Grease composition for resin lubrication and electric power steering device |
| WO2020078734A1 (en) * | 2018-10-15 | 2020-04-23 | Robert Bosch Gmbh | Method for producing a gear worm which is located in particular on an armature shaft, and such a gear worm |
| KR20210001378U (en) * | 2019-12-12 | 2021-06-22 | 송영례 | waterwheel for fishfarm |
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| JP2007292179A (en) * | 2006-04-25 | 2007-11-08 | Kayaba Ind Co Ltd | Worm, reduction gear, and electric power steering device |
| JP2011052782A (en) * | 2009-09-03 | 2011-03-17 | Shin Kobe Electric Mach Co Ltd | Resin gear |
| JP2011185370A (en) * | 2010-03-09 | 2011-09-22 | Toshiba Corp | Worm gear |
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| JP2013155801A (en) * | 2012-01-30 | 2013-08-15 | Aisin Seiki Co Ltd | Face gear and gear device |
| CN103244651A (en) * | 2012-02-07 | 2013-08-14 | 株式会社捷太格特 | Worm wheel |
| WO2016104812A1 (en) * | 2014-12-26 | 2016-06-30 | 協同油脂株式会社 | Grease composition for resin lubrication and electric power steering device |
| JPWO2016104812A1 (en) * | 2014-12-26 | 2017-11-24 | 協同油脂株式会社 | Grease composition for resin lubrication and electric power steering device |
| US10920163B2 (en) | 2014-12-26 | 2021-02-16 | Kyodo Yushi Co., Ltd. | Grease composition for lubricating resins and electric power steering device |
| WO2020078734A1 (en) * | 2018-10-15 | 2020-04-23 | Robert Bosch Gmbh | Method for producing a gear worm which is located in particular on an armature shaft, and such a gear worm |
| CN112805114A (en) * | 2018-10-15 | 2021-05-14 | 罗伯特·博世有限公司 | Method for producing a drive worm, in particular arranged on an armature shaft, and such a drive worm |
| CN112805114B (en) * | 2018-10-15 | 2023-08-11 | 罗伯特·博世有限公司 | Method for producing a drive worm, drive worm produced by said method and drive unit having said drive worm |
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