JP2006144305A - Turning mechanism - Google Patents

Turning mechanism Download PDF

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Publication number
JP2006144305A
JP2006144305A JP2004333675A JP2004333675A JP2006144305A JP 2006144305 A JP2006144305 A JP 2006144305A JP 2004333675 A JP2004333675 A JP 2004333675A JP 2004333675 A JP2004333675 A JP 2004333675A JP 2006144305 A JP2006144305 A JP 2006144305A
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Japan
Prior art keywords
pinion gear
turning
insertion hole
teeth
center
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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.)
Pending
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JP2004333675A
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Japanese (ja)
Inventor
Takafumi Akutagawa
隆文 芥川
Hiroaki Kuboi
宏暁 久保井
Kenji Suzuki
健司 鈴木
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KYB Corp
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Kayaba Industry Co Ltd
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Application filed by Kayaba Industry Co Ltd filed Critical Kayaba Industry Co Ltd
Priority to JP2004333675A priority Critical patent/JP2006144305A/en
Priority to PCT/JP2005/020672 priority patent/WO2006054485A1/en
Publication of JP2006144305A publication Critical patent/JP2006144305A/en
Pending legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/10—Supports for movable superstructures mounted on travelling or walking gears or on other superstructures
    • E02F9/12—Slewing or traversing gears
    • E02F9/121—Turntables, i.e. structure rotatable about 360°
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/84—Slewing gear
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/10—Supports for movable superstructures mounted on travelling or walking gears or on other superstructures
    • E02F9/12—Slewing or traversing gears
    • E02F9/121—Turntables, i.e. structure rotatable about 360°
    • E02F9/123—Drives or control devices specially adapted therefor

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Component Parts Of Construction Machinery (AREA)
  • Jib Cranes (AREA)
  • Gear Transmission (AREA)
  • General Details Of Gearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a means for adjusting backlash between the teeth of a pinion gear and the teeth of a ring gear at a low cost with simple constitution in a turning mechanism of an industrial vehicle provided with a turning wheel mounted to a travel body, a bearing for supporting a turning body rotatably to the turning wheel, a motor mounted to the turning body, the pinion gear direct-coupled to an output shaft, and the ring gear with the teeth formed at the turning wheel and meshed with the teeth of the pinion gear. <P>SOLUTION: This turning mechanism is provided with a circular insertion hole formed in the turning body; a circular centering location 17 forming a fitting part to the insertion hole, at a motor 20; means 18, 22, or the like for regulating relative displacement between the insertion hole and the socket and centering location 17. As a means for adjusting the backlash between the teeth of the pinion gear 21 and the teeth of the ring gear 11, when the motor 20 rotates around the circular socket and centering location 17 fitted into the circular insertion hole, the center of the pinion gear 21 is offset from the centering location 17 so that the center of the pinion gear 21 revolves around the centering location 17. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

この発明は、産業車両において、走行体とこれに搭載される旋回体との間に介装される旋回機構の改良に関する。   The present invention relates to an improvement in a turning mechanism interposed between a traveling body and a turning body mounted thereon in an industrial vehicle.

走行体にショベルやクレーン等の旋回体を搭載する産業車両においては、上部の旋回体と下部の走行体との間に介装される旋回機構として図４〜図６のように構成したものが知られている。   In an industrial vehicle in which a swinging body such as an excavator or a crane is mounted on the traveling body, a structure configured as shown in FIG. 4 to FIG. 6 as a turning mechanism interposed between the upper traveling body and the lower traveling body. Are known.

走行体（図示せず）に旋回輪１０が取り付けられ、旋回輪１０の内周にリングギヤ１１が形成される。旋回体１２（ショベルやクレーン等）は、走行体の旋回輪１０にベアリング１３を介して回転自在に支持される。旋回体１２にモータ１４（油圧モータまたは電動モータ）が取り付けられ、モータ１４の出力軸に旋回輪１０のリングギヤ１１とかみ合うピニオンギヤ１５が直結される。   A turning wheel 10 is attached to a traveling body (not shown), and a ring gear 11 is formed on the inner periphery of the turning wheel 10. The swivel body 12 (excavator, crane, etc.) is rotatably supported on the swivel wheel 10 of the traveling body via a bearing 13. A motor 14 (hydraulic motor or electric motor) is attached to the swing body 12, and a pinion gear 15 that meshes with the ring gear 11 of the swing wheel 10 is directly connected to the output shaft of the motor 14.

モータ１４が駆動すると、ピニオンギヤ１５が自転しつつリングギヤ１１に沿って公転するため、旋回体１２は、旋回輪１０の中心をモータ１４の回転と逆方向へ送り出されるのである。   When the motor 14 is driven, the pinion gear 15 revolves along the ring gear 11 while rotating, so that the turning body 12 is sent out from the center of the turning wheel 10 in the direction opposite to the rotation of the motor 14.

モータ１４の取付精度を高めるため、旋回体１２に挿入穴１６が形成され、この穴１６に嵌り合うインロー部１７がモータ１４に形成される。モータ１４に取り付け用のフランジ１８が形成され、挿入穴１６とインロー部１７との嵌り合う状態において、モータ１４はフランジ１８のボルト穴１９を通るボルト（図示せず）を旋回体１２のネジ穴（図示せず）に締め付けることにより旋回体１２に固着される。   In order to increase the mounting accuracy of the motor 14, an insertion hole 16 is formed in the revolving structure 12, and an inlay portion 17 that fits into the hole 16 is formed in the motor 14. In the state where the mounting flange 18 is formed in the motor 14 and the insertion hole 16 and the spigot portion 17 are fitted, the motor 14 uses a bolt (not shown) passing through the bolt hole 19 of the flange 18 to thread the screw hole of the swivel body 12. By fastening to (not shown), it is fixed to the swivel body 12.

このような、従来の旋回機構にあっては、ピニオンギヤ１５とリングギヤ１１との相対位置は、モータ１４の取付精度（つまり、挿入穴１６とインロー部１７との嵌め合いの加工精度）に依存するため、ピニオンギヤ１５とリングギヤ１１とのバックラッシ量を調整しきれない可能性が考えられる。また、ギヤが経時的に摩耗すると、バックラッシ量が大きくなるが、従来の場合、バックラッシの再調整も簡単に図れないのである。バックラッシ量が大きくなると、ギヤ間のガタにより、旋回体１２の停止位置が不安定になってしまう。   In such a conventional turning mechanism, the relative position between the pinion gear 15 and the ring gear 11 depends on the mounting accuracy of the motor 14 (that is, the processing accuracy of the fitting between the insertion hole 16 and the spigot portion 17). Therefore, there is a possibility that the backlash amount between the pinion gear 15 and the ring gear 11 cannot be adjusted. Further, when the gear wears with time, the amount of backlash increases, but in the conventional case, readjustment of backlash cannot be easily achieved. When the amount of backlash increases, the stop position of the revolving structure 12 becomes unstable due to backlash between the gears.

この発明は、このような不具合を解決するための有効な手段の提供を目的とする。   An object of this invention is to provide an effective means for solving such a problem.

この発明は、走行体とこれに搭載される旋回体と、を備える産業車両において、走行体に装着される旋回輪と、旋回輪に旋回体を回転自在に支持するベアリングと、旋回体に形成される円形の挿入穴と、この穴との嵌め合い部をモータの外形に形成する円形のインロー部と、挿入穴とインロー部との相対変位を規制する手段と、モータの出力軸に直結するピニオンギヤと、旋回輪にピニオンギヤの歯とかみ合う歯を形成するリングギヤと、を設ける一方、ピニオンギヤの歯とリングギヤの歯とのバックラッシを調整する手段としてモータが円形の挿入穴に嵌り合う円形のインロー部を中心に回転するとピニオンギヤの中心がインロー部の中心を公転するようにピニオンギヤの中心をインロー部の中心からオフセットしたことを特徴とする。   The present invention relates to an industrial vehicle including a traveling body and a turning body mounted on the traveling body. The turning wheel is mounted on the traveling body, the bearing that rotatably supports the turning body on the turning wheel, and the turning body. A circular insertion hole, a circular inlay portion that forms a fitting portion with the hole in the outer shape of the motor, a means for restricting relative displacement between the insertion hole and the inlay portion, and a direct output to the motor output shaft A circular inlay portion in which the motor fits into a circular insertion hole as a means for adjusting the backlash between the pinion gear teeth and the ring gear teeth, while providing a pinion gear and a ring gear that forms teeth that mesh with the teeth of the pinion gear on the swivel wheel The center of the pinion gear is offset from the center of the spigot portion so that the center of the pinion gear revolves around the center of the spigot portion when rotated about the center.

この発明においては、ピニオンギヤの中心とインロー部の中心との間にオフセットが設定されるため、モータが回転（変位）すると、ピニオンギヤの中心がインロー部の中心を公転するようになり、ピニオンギヤとリングギヤとの中心間距離が変わるのである。そのため、モータの回転により、バックラッシの調整が簡単に得られる。   In this invention, since an offset is set between the center of the pinion gear and the center of the inlay portion, when the motor rotates (displaces), the center of the pinion gear revolves around the center of the inlay portion, and the pinion gear and the ring gear The center-to-center distance changes. Therefore, the backlash can be easily adjusted by the rotation of the motor.

図１〜図３は、この発明の実施形態として産業車両（走行体にショベルやクレーン等の旋回体を搭載する）への適用例を説明するものである。   FIGS. 1 to 3 illustrate an application example to an industrial vehicle (in which a traveling body such as an excavator or a crane is mounted on a traveling body) as an embodiment of the present invention.

２０は旋回体１２のフレームに取り付けられるモータ（油圧モータまたは電動モータ）であり、その出力軸に旋回輪１０のリングギヤ１１とかみ合うピニオンギヤ２１が直結される。旋回輪１０は、走行体（図示せず）のフレームに取り付けられ、旋回体（ショベルやクレーン等）が旋回輪１０にベアリング（図４の１３、参照）を介して支持される。   Reference numeral 20 denotes a motor (hydraulic motor or electric motor) attached to the frame of the revolving body 12, and a pinion gear 21 that meshes with the ring gear 11 of the revolving wheel 10 is directly connected to its output shaft. The turning wheel 10 is attached to a frame of a traveling body (not shown), and the turning body (such as an excavator or a crane) is supported on the turning wheel 10 via a bearing (see 13 in FIG. 4).

旋回体１２のフレームに円形の挿入穴（図４の１６、参照）が形成され、この穴に嵌り合う円形のインロー部１７がモータ２０に形成される。挿入穴とインロー部１７との相対変位を規制する手段として、モータ２０に形成されるフランジ１８と、フランジ１８に形成されるボルト穴２２と、旋回体１２のフレームに形成されるネジ穴（図示せず）と、ネジ穴に螺合するボルト（図示せず）と、が備えられる。   A circular insertion hole (see 16 in FIG. 4) is formed in the frame of the swivel body 12, and a circular inlay portion 17 that fits into this hole is formed in the motor 20. As means for restricting the relative displacement between the insertion hole and the spigot 17, a flange 18 formed in the motor 20, a bolt hole 22 formed in the flange 18, and a screw hole formed in the frame of the swivel body 12 (see FIG. And a bolt (not shown) that is screwed into the screw hole.

モータ２０は、挿入穴とインロー部１７との嵌り合う状態において、フランジ１８のボルト穴２２を通るボルトをネジ穴に締め付けることにより旋回体１２のフレームに固着される。フランジ１８のボルト穴２２は、ボルトを緩めることにより、挿入穴とインロー部１７との相対変位を許容しえる形状に設定される。   The motor 20 is fixed to the frame of the revolving body 12 by tightening a bolt that passes through the bolt hole 22 of the flange 18 into the screw hole in a state where the insertion hole and the spigot portion 17 are fitted. The bolt hole 22 of the flange 18 is set to a shape that allows relative displacement between the insertion hole and the spigot part 17 by loosening the bolt.

モータ２０が駆動すると、ピニオンギヤ２１が自転しつつリングギヤ１１に沿って公転するため、旋回体（ショベルやクレーン等）は、旋回輪１０の中心をモータ２０の回転と逆方向へ送り出されるのである。   When the motor 20 is driven, the pinion gear 21 revolves along the ring gear 11 while rotating, so that the revolving body (excavator, crane, etc.) is sent out from the center of the revolving wheel 10 in the direction opposite to the rotation of the motor 20.

ピニオンギヤ２１の歯とリングギヤ１１の歯とのバックラッシを調整する手段として、モータ２０を円形の挿入穴に嵌り合う円形のインロー部１７を中心に回転させることにより、ピニオンギヤ２１の中心がインロー部１７の中心を公転するようにピニオンギヤ２１の中心とインロー部１７の中心との間にオフセットｄが設定される。   As a means for adjusting the backlash between the teeth of the pinion gear 21 and the teeth of the ring gear 11, the center of the pinion gear 21 is adjusted to the center of the spigot 17 by rotating the motor 20 around the circular spigot 17 that fits in the circular insertion hole. An offset d is set between the center of the pinion gear 21 and the center of the spigot part 17 so as to revolve the center.

初期のオフセットｄは、バックラッシの調整範囲を最大限に取れるよう、リングギヤ１１の中心線Ｐおよびインロー部１７の中心線Ｑを含む断面ｍと直交する方向に設定される。   The initial offset d is set in a direction orthogonal to the cross-section m including the center line P of the ring gear 11 and the center line Q of the spigot portion 17 so that the backlash adjustment range can be maximized.

このような構成により、ボルトを緩めると、挿入穴とインロー部１７との相対変位に対する規制が解除され、この状態において、モータ２０をインロー部１７を中心に回転させると、ピニオンギヤ２１の中心とインロー部１７の中心とのオフセットｄにより、ピニオンギヤ２１の中心がインロー部１７の中心を公転するようになり、ピニオンギヤ２１とリングギヤ１１との中心間距離が変えられるため、バックラッシを簡単かつ適正に調整しえるのである。   With such a configuration, when the bolt is loosened, the restriction on the relative displacement between the insertion hole and the spigot portion 17 is released. In this state, when the motor 20 is rotated about the spigot portion 17, the center of the pinion gear 21 and the spigot portion The center of the pinion gear 21 revolves around the center of the spigot portion 17 due to the offset d from the center of the portion 17 and the center-to-center distance between the pinion gear 21 and the ring gear 11 can be changed, so that the backlash can be adjusted easily and appropriately. It is.

図４〜図６の場合と較べると、挿入穴とインロー部１７との相対変位を許容しえる形状のボルト穴２２に形成すると共にピニオンギヤ２１の中心をインロー部１７の中心からオフセットするだけの簡単な構成により、部品を追加する必要もなく、バックラッシの調整手段を安価に実現することができる。   Compared to the case of FIGS. 4 to 6, it is easy to form the bolt hole 22 having a shape allowing the relative displacement between the insertion hole and the spigot portion 17 and offset the center of the pinion gear 21 from the center of the spigot portion 17. With this configuration, it is not necessary to add parts, and the backlash adjusting means can be realized at low cost.

挿入穴とインロー部１７との相対変位を規制する手段において、ボルトを旋回体１２のフレームに締め付けるのでなく、図示しないが、油圧シリンダやバネ機構など適宜のデバイスにより、ピニオンギヤ２１を所定の荷重（規制力）でリングギヤ１１に押し付けるように構成することも考えられる。   In the means for restricting the relative displacement between the insertion hole and the spigot part 17, the bolt is not fastened to the frame of the revolving body 12, but although not shown, the pinion gear 21 is applied with a predetermined load (not shown) by an appropriate device such as a hydraulic cylinder or a spring mechanism. It is also conceivable that the ring gear 11 is configured to be pressed with a restriction force.

適宜のデバイスにより、ピニオンギヤ２１は所定の荷重でリングギヤ１１に押し付けられ、バックラッシが０またはそれに近い状態になるのである。そのため、ギヤに摩耗を生じても、ピニオンギヤ２１をリングギヤ１１に押し付ける所定の荷重が変化しないかぎり、ギヤの摩耗量の分、モータ２０がインロー部１７を中心に変位（回転）するので、バックラッシは０またはそれに近い状態に維持される。つまり、油圧シリンダやバネ機構など適宜のデバイスを用いることにより、バックラッシを自動的に除去する調整機能が得られるのである。その結果、ギヤの多少の摩耗に拘わらず、旋回体の停止位置を常にバラツキなく制御しえるようになる。   With an appropriate device, the pinion gear 21 is pressed against the ring gear 11 with a predetermined load, and the backlash becomes zero or close to it. Therefore, even if the gear is worn, the motor 20 is displaced (rotated) about the inlay portion 17 by the amount of gear wear unless the predetermined load pressing the pinion gear 21 against the ring gear 11 changes. Maintained at or near zero. In other words, by using an appropriate device such as a hydraulic cylinder or a spring mechanism, an adjustment function for automatically removing backlash can be obtained. As a result, it becomes possible to always control the stop position of the revolving body without any variation regardless of some wear of the gear.

この発明に係るバックラッシの調整手段については、産業車両の旋回機構に限らず、ピニオンギヤとリングギヤとから構成される回転伝達機構に広く適用可能である。   The backlash adjusting means according to the present invention is not limited to the turning mechanism of an industrial vehicle, and can be widely applied to a rotation transmission mechanism including a pinion gear and a ring gear.

この発明の実施形態を説明する要部の構成図である。It is a block diagram of the principal part explaining embodiment of this invention. 図１のＡ矢視図である。It is A arrow directional view of FIG. 同じくインロー部とピニオンギヤとリングギヤとの位置関係の説明図である。It is explanatory drawing of the positional relationship of an inlay part, a pinion gear, and a ring gear similarly. 従前の技術を説明する要部の構成図である。It is a block diagram of the principal part explaining the conventional technique. 図４のＢ矢視図である。It is a B arrow view of FIG. 同じくピニオンギヤとリングギヤとインロー部との位置関係の説明図である。It is explanatory drawing of the positional relationship between a pinion gear, a ring gear, and an inlay part similarly.

符号の説明Explanation of symbols

１０ 旋回輪
１１ リングギヤ
１７ インロー部
１８ フランジ
２０ モータ
２１ ピニオンギヤ
２２ ボルト穴 DESCRIPTION OF SYMBOLS 10 Turning wheel 11 Ring gear 17 Inlay part 18 Flange 20 Motor 21 Pinion gear 22 Bolt hole

Claims (4)

走行体とこれに搭載される旋回体と、を備える産業車両において、走行体に装着される旋回輪と、旋回輪に旋回体を回転自在に支持するベアリングと、旋回体に形成される円形の挿入穴と、この穴との嵌め合い部をモータの外形に形成する円形のインロー部と、挿入穴とインロー部との相対変位を規制する手段と、モータの出力軸に直結するピニオンギヤと、旋回輪にピニオンギヤの歯とかみ合う歯を形成するリングギヤと、を設ける一方、ピニオンギヤの歯とリングギヤの歯とのバックラッシを調整する手段としてモータが円形の挿入穴に嵌り合う円形のインロー部を中心に回転するとピニオンギヤの中心がインロー部の中心を公転するようにピニオンギヤの中心をインロー部の中心からオフセットしたことを特徴とする産業車両の旋回機構。   In an industrial vehicle including a traveling body and a turning body mounted thereon, a turning wheel attached to the traveling body, a bearing that rotatably supports the turning body on the turning wheel, and a circular shape formed on the turning body An insertion hole, a circular spigot portion that forms a fitting portion with the hole on the outer shape of the motor, a means for restricting relative displacement between the insertion hole and the spigot portion, a pinion gear that is directly connected to the output shaft of the motor, and a swivel A ring gear that forms teeth that mesh with the teeth of the pinion gear is provided on the ring, and as a means for adjusting the backlash between the teeth of the pinion gear and the teeth of the ring gear, the motor rotates around a circular spigot that fits into the circular insertion hole Then, the swivel of the industrial vehicle characterized in that the center of the pinion gear is offset from the center of the inlay portion so that the center of the pinion gear revolves around the center of the inlay portion. . 初期のオフセットは、リングギヤの中心線およびインロー部の中心線を含む断面に対する直交方向に設定したことを特徴とする請求項１に記載の旋回機構。   The turning mechanism according to claim 1, wherein the initial offset is set in a direction orthogonal to a cross section including a center line of the ring gear and a center line of the inlay portion. 挿入穴とインロー部との相対変位を規制する手段は、モータに形成されるフランジと、フランジに形成されるボルト穴と、旋回体のネジ穴に螺合するボルトと、からなり、フランジのボルト穴を通して旋回体のネジ穴に締め付けられるボルトを緩めることにより挿入穴とインロー部との相対変位を許容しえるようにボルト穴の形状を設定したことを特徴とする請求項１に記載の旋回機構。   The means for restricting the relative displacement between the insertion hole and the spigot portion is composed of a flange formed in the motor, a bolt hole formed in the flange, and a bolt screwed into the screw hole of the swivel body. The swivel mechanism according to claim 1, wherein the bolt hole shape is set so as to allow relative displacement between the insertion hole and the spigot portion by loosening a bolt that is tightened into the screw hole of the swivel body through the hole. . 挿入穴とインロー部との相対変位を規制する手段は、ピニオンギヤを所定の荷重でリングギヤに押し付けるように構成したことを特徴とする請求項１に記載の旋回機構。   2. The turning mechanism according to claim 1, wherein the means for restricting the relative displacement between the insertion hole and the spigot portion is configured to press the pinion gear against the ring gear with a predetermined load.
JP2004333675A 2004-11-17 2004-11-17 Turning mechanism Pending JP2006144305A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2004333675A JP2006144305A (en) 2004-11-17 2004-11-17 Turning mechanism
PCT/JP2005/020672 WO2006054485A1 (en) 2004-11-17 2005-11-04 Slewing mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004333675A JP2006144305A (en) 2004-11-17 2004-11-17 Turning mechanism

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JP2006144305A true JP2006144305A (en) 2006-06-08

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010090587A (en) * 2008-10-07 2010-04-22 Hitachi Constr Mach Co Ltd Construction machine
KR101449017B1 (en) * 2007-12-27 2014-10-13 두산인프라코어 주식회사 Apparatus and Method for positioning turning device for construction heavy equipments

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DE202010011721U1 (en) * 2010-08-24 2010-10-21 Manitowoc Crane Group France Sas Radial play compensating rotary encoder arrangement
CN102322148B (en) * 2011-06-20 2012-08-29 三一重工股份有限公司 Centre revolving device and construction machine
CN102976217A (en) * 2012-11-16 2013-03-20 无锡市华星船舶设备有限公司 Crane slewing mechanism capable of adjusting gap between gears
CN110626966B (en) * 2019-09-27 2021-10-26 徐州重型机械有限公司 Slewing mechanism, method for adjusting backlash and crane

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Publication number Priority date Publication date Assignee Title
JPH0365758U (en) * 1989-10-31 1991-06-26
JPH03122145U (en) * 1990-03-28 1991-12-13
JP2003268803A (en) * 2002-03-12 2003-09-25 Hitachi Constr Mach Co Ltd Slewing device for construction machinery

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101449017B1 (en) * 2007-12-27 2014-10-13 두산인프라코어 주식회사 Apparatus and Method for positioning turning device for construction heavy equipments
JP2010090587A (en) * 2008-10-07 2010-04-22 Hitachi Constr Mach Co Ltd Construction machine

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