JP5342248B2 - Traveling unit for construction machinery - Google Patents

Traveling unit for construction machinery Download PDF

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Publication number
JP5342248B2
JP5342248B2 JP2009008446A JP2009008446A JP5342248B2 JP 5342248 B2 JP5342248 B2 JP 5342248B2 JP 2009008446 A JP2009008446 A JP 2009008446A JP 2009008446 A JP2009008446 A JP 2009008446A JP 5342248 B2 JP5342248 B2 JP 5342248B2
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Prior art keywords
case
peripheral surface
rotating case
lid member
cylindrical portion
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JP2010164168A (en
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輝彦 佐竹
拓広 狩野
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Nabtesco Corp
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Nabtesco Corp
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Priority to JP2009008446A priority Critical patent/JP5342248B2/en
Priority to PCT/JP2010/050417 priority patent/WO2010082628A1/en
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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
    • E02F9/20—Drives; Control devices
    • E02F9/202—Mechanical transmission, e.g. clutches, gears
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/043—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel
    • B60K17/046—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel with planetary gearing having orbital motion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/031—Gearboxes; Mounting gearing therein characterised by covers or lids for gearboxes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
    • F16H1/46—Systems consisting of a plurality of gear trains each with orbital gears, i.e. systems having three or more central gears

Description

本発明は、モータの回転を減速させて出力する建設機械用走行ユニットに関する。   The present invention relates to a traveling unit for construction machinery that outputs by reducing the rotation of a motor.

一般に、油圧ショベルなどの建設機械の走行装置としてクローラが多く採用され、このクローラの駆動装置として、油圧モータ機構と遊星減速機構とを組み合わせた走行ユニットが用いられている。従来、この走行ユニットとして、例えば特許文献１に記載されたようなものがある。特許文献１に記載された走行ユニット（減速機装置）は、油圧モータ機構を収納する本体ケース（２）と、本体ケース（２）に対して回転自在に嵌合し且つ変速部（１Ｂ）を収納する回転ケース（５）とを備えてなるものである。ここで、この走行ユニット（減速機装置）においては、回転ケース（５）の端部の開口の内側に蓋体（２８）を嵌め込んで、本体ケース（２）と蓋体（２８）とを固定している（特許文献１の図１参照）。   In general, a crawler is often used as a traveling device for a construction machine such as a hydraulic excavator, and a traveling unit combining a hydraulic motor mechanism and a planetary speed reduction mechanism is used as a driving device for the crawler. Conventionally, as this traveling unit, there exists a thing as described in patent document 1, for example. A travel unit (reduction gear device) described in Patent Literature 1 is rotatably fitted to a main body case (2) that houses a hydraulic motor mechanism, and a main body case (2), and a transmission (1B) is provided. A rotating case (5) for housing is provided. Here, in this traveling unit (reduction gear device), the lid (28) is fitted inside the opening at the end of the rotating case (5), and the main body case (2) and the lid (28) are attached. It is fixed (see FIG. 1 of Patent Document 1).

しかしながら、特許文献１に記載されたような、回転ケース（５）の開口の内側に蓋体（２８）を嵌め込んで、本体ケース（２）と蓋体（２８）とを固定するという構造の走行ユニットでは、回転ケース（５）と蓋体（２８）との間から回転ケース（５）内の潤滑油が漏れてしまうことがある。減速機内部の歯車が動くことにより回転ケース（５）が外側に変形し、この変形により、回転ケース（５）と蓋体（２８）との間に隙間が生じて潤滑油が漏れてしまうのである。対策として、回転ケース（５）と蓋体（２８）との間にシール剤を塗布するなどしているが、この対策では、加工・組立性が悪く、製造コストが高いものとなってしまう。   However, as described in Patent Document 1, the lid (28) is fitted inside the opening of the rotating case (5) to fix the main body case (2) and the lid (28). In the traveling unit, the lubricating oil in the rotating case (5) may leak from between the rotating case (5) and the lid (28). As the gear inside the speed reducer moves, the rotating case (5) is deformed to the outside, and this deformation creates a gap between the rotating case (5) and the lid (28), and the lubricating oil leaks. is there. As a countermeasure, a sealant is applied between the rotating case (5) and the lid (28). However, with this countermeasure, the processing and assembling properties are poor and the manufacturing cost is high.

本発明は、上記実情に鑑みてなされたものであって、その目的は、回転ケースの外側への変形を抑えて回転ケース内の潤滑油の漏洩を防止することができる構造を備えた建設機械用走行ユニットを提供することである。   The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a construction machine having a structure capable of preventing leakage of lubricating oil in the rotating case by suppressing deformation to the outside of the rotating case. It is to provide a traveling unit for use.

上記目的を達成するために本発明は、建設機械に固定される本体ケースと、前記本体ケースに対して回転自在に保持され内周に内歯が形成された回転ケースと、前記回転ケース内に収納され前記内歯に噛み合う減速機構と、前記回転ケースの開口を覆う蓋部材と、前記蓋部材を前記回転ケースに固定する固定手段と、前記蓋部材と前記回転ケースとの間に配置されたシールと、を備え、前記蓋部材は、前記開口を覆う底部と、前記底部の端からケース軸方向に延在する筒部と、を有し、前記回転ケース端部の外周面に前記筒部の内周面を嵌合させて、当該回転ケースと前記蓋部材とを固定してなる建設機械用走行ユニットを提供する。   In order to achieve the above object, the present invention includes a main body case fixed to a construction machine, a rotating case that is rotatably held with respect to the main body case and has inner teeth formed on an inner periphery thereof, and the rotating case. A speed reduction mechanism that is housed and meshes with the inner teeth, a lid member that covers the opening of the rotating case, a fixing means that fixes the lid member to the rotating case, and a lid member and the rotating case. And the lid member includes a bottom portion that covers the opening, and a cylindrical portion that extends from an end of the bottom portion in a case axial direction, and the cylindrical portion is provided on an outer peripheral surface of the rotating case end portion. A traveling unit for construction machines is provided in which the inner peripheral surface is fitted and the rotating case and the lid member are fixed.

この構成によると、回転ケース端部の外周面に蓋部材の筒部の内周面を嵌合させて回転ケースと蓋部材とを固定することで、回転ケースが外側へ変形しようとしても、その変形は、蓋部材の筒部により抑えられる。また、回転ケースが外側へ少し変形したとしても、回転ケースの外周端部と蓋部材の筒部との間に隙間が増大することはなく、シール性を維持し続けることができる。   According to this configuration, even if the rotating case is deformed to the outside by fixing the rotating case and the lid member by fitting the inner peripheral surface of the cylindrical portion of the lid member to the outer peripheral surface of the rotating case end, Deformation is suppressed by the cylindrical portion of the lid member. Further, even if the rotating case is slightly deformed to the outside, a gap does not increase between the outer peripheral end of the rotating case and the cylindrical portion of the lid member, and the sealing performance can be maintained.

また本発明において、前記シールが、前記回転ケース端部の外周面と前記筒部の内周面との間に配置されていることが好ましい。   Moreover, in this invention, it is preferable that the said seal | sticker is arrange | positioned between the outer peripheral surface of the said rotation case edge part, and the internal peripheral surface of the said cylinder part.

この構成によると、回転ケースが外側へ変形しようとするときでも、または、回転ケースが外側へ変形したときでも、回転ケース端部の外周面と蓋部材の筒部の内周面との間でシールは挟持され続ける。これにより、回転ケース内の潤滑油の漏洩をより確実に防止することができる。   According to this configuration, even when the rotating case is going to be deformed outward or when the rotating case is deformed outward, between the outer peripheral surface of the end of the rotating case and the inner peripheral surface of the cylindrical portion of the lid member. The seal continues to be pinched. Thereby, the leakage of the lubricating oil in the rotating case can be prevented more reliably.

さらに本発明において、前記シールが、前記筒部の内周面に形成された溝部に配置されていることが好ましい。   Furthermore, in the present invention, it is preferable that the seal is disposed in a groove formed on the inner peripheral surface of the cylindrical portion.

この構成によると、シールのつぶし代が大きくなり、シール性を高めることができる。   According to this structure, the crushing cost of a seal becomes large and can improve sealing performance.

さらに本発明において、前記回転ケース端部の外周面に段差が形成されていることが好ましい。   Furthermore, in this invention, it is preferable that the level | step difference is formed in the outer peripheral surface of the said rotation case edge part.

この構成によると、蓋部材の筒部の外周面が回転ケースの外周面よりも外側に張り出す量を低減でき、その結果、これらの外周面と建設機械のクローラとの間に流入した土砂が、この間に溜まることを防止できる。   According to this configuration, it is possible to reduce the amount of the outer peripheral surface of the cylindrical portion of the lid member protruding outward from the outer peripheral surface of the rotating case, and as a result, the earth and sand that flows between these outer peripheral surfaces and the crawler of the construction machine , Can be prevented from accumulating during this time.

さらに本発明において、前記固定手段は、前記筒部の外周からケース軸中心に向かって配設されたボルトであり、当該ボルトが、前記筒部の外周に２乃至１０個均等配置されていることが好ましい。   Further, in the present invention, the fixing means is a bolt arranged from the outer periphery of the cylindrical portion toward the center of the case axis, and 2 to 10 bolts are equally arranged on the outer periphery of the cylindrical portion. Is preferred.

この構成によると、ボルトの主たる役割は蓋部材を回転ケースに固定することであり、すなわち、蓋部材と回転ケースとの間のシール性に関してはボルトによる締め付け力を特に考慮する必要がないので、ボルトの数量を低減することができる。   According to this configuration, the main role of the bolt is to fix the lid member to the rotating case, that is, there is no need to particularly consider the tightening force by the bolt with respect to the sealing performance between the lid member and the rotating case. The number of bolts can be reduced.

本発明によれば、本発明の構成要件、特に、底部の端からケース軸方向に延在する筒部を有する蓋部材により、回転ケース端部の外周面に当該蓋部材の筒部の内周面を嵌合させて回転ケースを固定することで、回転ケースの外側への変形を抑えることができ、その結果、回転ケース内の潤滑油の漏洩を防止することができる。   According to the present invention, by the lid member having the cylindrical portion extending in the case axial direction from the end of the bottom portion, particularly the inner periphery of the cylindrical portion of the lid member on the outer peripheral surface of the rotating case end portion. By fitting the surfaces and fixing the rotating case, deformation to the outside of the rotating case can be suppressed, and as a result, leakage of lubricating oil in the rotating case can be prevented.

本発明の一実施形態に係る建設機械用走行ユニットの一部切り欠き断面図である。It is a partially cutaway sectional view of a traveling unit for construction machines according to an embodiment of the present invention. 図１のＡ部拡大図である。It is the A section enlarged view of FIG.

以下、本発明を実施するための形態について図面を参照しつつ説明する。なお、本発明に係る建設機械用走行ユニット（以下、「走行ユニット」と記載する）は、油圧ショベルなどの建設機械のクローラ（走行装置）の駆動装置として用いられるものである。   Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The construction machine travel unit (hereinafter referred to as “travel unit”) according to the present invention is used as a drive device for a crawler (travel device) of a construction machine such as a hydraulic excavator.

（走行ユニットの構成）
図１は、本発明の一実施形態に係る走行ユニット１の一部切り欠き断面図である。図２は、図１のＡ部拡大図である。 (Configuration of traveling unit)
FIG. 1 is a partially cutaway sectional view of a traveling unit 1 according to an embodiment of the present invention. FIG. 2 is an enlarged view of part A in FIG.

図１に示すように、本実施形態の走行ユニット１は、建設機械の車体（不図示）に固定される本体ケース２と、本体ケース２に対して回転自在に保持された回転ケース３と、回転ケース３の端部の開口を覆う蓋部材６と、を備えている。なお、本体ケース２の外周面と回転ケース３の内周面との間にボールベアリングなどの軸受が嵌め込まれており、この軸受を介して回転ケース３は本体ケース２に対して回転自在に保持される（図示省略）。   As shown in FIG. 1, a traveling unit 1 according to this embodiment includes a main body case 2 fixed to a vehicle body (not shown) of a construction machine, a rotating case 3 that is rotatably held with respect to the main body case 2, A lid member 6 that covers the opening at the end of the rotating case 3. A bearing such as a ball bearing is fitted between the outer peripheral surface of the main body case 2 and the inner peripheral surface of the rotating case 3, and the rotating case 3 is rotatably held with respect to the main body case 2 via this bearing. (Not shown).

（本体ケース）
本体ケース２は、金属製で、その内部にモータ機構４（図示省略）が収納されている。また、本体ケース２は、その外周にフランジ部２ａが形成されている。走行ユニット１は、このフランジ部２ａの部分で建設機械の車体に対して固定される。本体ケース２は、全体として筒状に形成されている。 (Body case)
The main body case 2 is made of metal, and a motor mechanism 4 (not shown) is accommodated therein. The main body case 2 has a flange portion 2a formed on the outer periphery thereof. The traveling unit 1 is fixed to the vehicle body of the construction machine at the flange portion 2a. The main body case 2 is formed in a cylindrical shape as a whole.

ここで、モータ機構４は、油圧で作動する油圧モータ機構である。モータ機構４の回転中心には出力軸１１（図示省略）が配置されている。モータ機構４の作動により出力軸１１は回転する。   Here, the motor mechanism 4 is a hydraulic motor mechanism that operates by hydraulic pressure. An output shaft 11 (not shown) is disposed at the rotation center of the motor mechanism 4. The output shaft 11 is rotated by the operation of the motor mechanism 4.

（回転ケース）
回転ケース３は、金属製で、その内部に減速機構５が収納されている。また、回転ケース３の一方の端部の外周にはフランジ部３ｃが形成されている。このフランジ部３ｃには、建設機械の駆動用スプロケット（不図示）が取り付けられる。駆動用スプロケットが取り付けられた回転ケース３が減速機構５を介してモータ機構４により回転させられることで、クローラ（不図示）が駆動される。また、符号を付して図２に示したように、回転ケース３の他方の端部の外周面３ｂには、段差が形成されている。なお、この段差は、ケース軸中心に向かって落ち込む段差である。また、この段差部には、ボルト７の先端が挿入される有底の穴３ｄが形成されている。なお、この穴３ｄは、内周にネジが切られたネジ穴としてもよい。回転ケース３は、全体として筒状に形成され、内部には減速機構５のための潤滑油が封入されている。 (Rotating case)
The rotating case 3 is made of metal, and the speed reduction mechanism 5 is accommodated therein. A flange portion 3 c is formed on the outer periphery of one end portion of the rotating case 3. A sprocket for driving a construction machine (not shown) is attached to the flange portion 3c. The crawler (not shown) is driven when the rotating case 3 to which the driving sprocket is attached is rotated by the motor mechanism 4 via the speed reduction mechanism 5. Further, as shown in FIG. 2 with reference numerals, a step is formed on the outer peripheral surface 3 b of the other end of the rotating case 3. This step is a step that falls toward the center of the case axis. In addition, a bottomed hole 3d into which the tip of the bolt 7 is inserted is formed in the step portion. In addition, this hole 3d is good also as a screw hole by which the screw | thread was cut by the inner periphery. The rotating case 3 is formed in a cylindrical shape as a whole, and lubricating oil for the speed reduction mechanism 5 is sealed inside.

減速機構５は、遊星歯車機構からなるものであって、その中心部には、モータ機構４の出力軸１１が取り付けられている。また、回転ケース３の内周には、減速機構５の歯車（遊星歯車）と噛み合う内歯３ａが形成されている。そして、減速機構５は、出力軸１１の回転速度を減速させてモータ機構４からの出力を内歯３ａを介して回転ケース３に伝達する。   The speed reduction mechanism 5 is composed of a planetary gear mechanism, and an output shaft 11 of the motor mechanism 4 is attached to the center thereof. An inner tooth 3 a that meshes with a gear (planetary gear) of the speed reduction mechanism 5 is formed on the inner periphery of the rotating case 3. The speed reduction mechanism 5 reduces the rotational speed of the output shaft 11 and transmits the output from the motor mechanism 4 to the rotary case 3 via the internal teeth 3a.

（蓋部材）
回転ケース３の他方の端部の開口は、蓋部材６で閉止されている。蓋部材６は、金属製で、回転ケース３の開口を覆う円板上の底部９と、底部９の端からケース軸方向に延在する筒部１０とを有している。 (Cover member)
The opening at the other end of the rotating case 3 is closed by a lid member 6. The lid member 6 is made of metal and has a bottom portion 9 on a disc that covers the opening of the rotating case 3 and a cylindrical portion 10 that extends from the end of the bottom portion 9 in the case axial direction.

底部９は、その中心から径方向に向けて順に、第１厚肉部９ａ、薄肉部９ｂ、第２厚肉部９ｃに区別される。また、底部９の外側の中心部は、凹部９ｄとなっている。   The bottom portion 9 is sequentially distinguished from the center in the radial direction into a first thick portion 9a, a thin portion 9b, and a second thick portion 9c. Moreover, the center part of the outer side of the bottom part 9 becomes the recessed part 9d.

図１のＡ部拡大図を図２に示したように、筒部１０は、その先端部にボルト７がねじ込まれるネジ孔１０ｃを備えている。また、筒部１０の内周面１０ａには断面コ字状の溝部１０ｂが全周にわたって形成されている。この溝部１０ｂは、ネジ孔１０ｃよりも底部９側に設けられている。溝部１０ｂには、Ｏリング８（シール）が入れられている。なお、筒部１０の内周面１０ａではなく、回転ケース３端部の外周面３ｂに溝部を形成し、この溝部にＯリング８を配置してもよい。また、溝部１０ｂに配置するシールは、Ｏリング８に限られることはなく、様々なリング形態のシールを用いることができる。   As shown in FIG. 2 which is an enlarged view of the portion A in FIG. 1, the tube portion 10 includes a screw hole 10 c into which the bolt 7 is screwed at the tip portion. Further, a groove portion 10b having a U-shaped cross section is formed on the inner peripheral surface 10a of the cylindrical portion 10 over the entire circumference. The groove 10b is provided closer to the bottom 9 than the screw hole 10c. An O-ring 8 (seal) is placed in the groove 10b. A groove portion may be formed on the outer peripheral surface 3b of the end portion of the rotating case 3 instead of the inner peripheral surface 10a of the cylindrical portion 10, and the O-ring 8 may be disposed in this groove portion. Moreover, the seal | sticker arrange | positioned in the groove part 10b is not restricted to the O-ring 8, The seal of various ring forms can be used.

蓋部材６は、回転ケース３に対して次のようにして固定される。まず、回転ケース３端部の外周面３ｂに筒部１０の内周面１０ａを嵌合させる。そして、回転ケース３端部の外周面３ｂに形成された穴３ｄに向かって筒部１０の外周からボルト７をねじ込む。このようにして、回転ケース３と蓋部材６とを固定するのである。このとき、Ｏリング８は、回転ケース３端部の外周面３ｂと、筒部１０の内周面１０ａ（溝部１０ｂ）との間につぶされて挟持される。   The lid member 6 is fixed to the rotating case 3 as follows. First, the inner peripheral surface 10a of the cylindrical portion 10 is fitted to the outer peripheral surface 3b at the end of the rotating case 3. And the bolt 7 is screwed in from the outer periphery of the cylinder part 10 toward the hole 3d formed in the outer peripheral surface 3b of the rotation case 3 edge part. In this way, the rotating case 3 and the lid member 6 are fixed. At this time, the O-ring 8 is crushed and sandwiched between the outer peripheral surface 3 b at the end of the rotating case 3 and the inner peripheral surface 10 a (groove portion 10 b) of the cylindrical portion 10.

ここで、筒部１０の内径は、回転ケース３端部の外周面３ｂの外径よりも少し小さくされる。これにより、蓋部材６の筒部１０と回転ケース３との嵌合力を確保している。   Here, the inner diameter of the cylindrical portion 10 is made slightly smaller than the outer diameter of the outer peripheral surface 3b at the end of the rotating case 3. Thereby, the fitting force of the cylinder part 10 of the cover member 6 and the rotation case 3 is ensured.

以上説明したように、本実施形態の走行ユニット１によると、回転ケース３端部の外周面３ｂに蓋部材６の筒部１０の内周面１０ａを嵌合させて回転ケース３と蓋部材６とを固定することで、回転ケース３がその径方向外側へ変形しようとしても、その変形は、蓋部材６の筒部１０により抑えられる。また、回転ケース３が外側へ少し変形したとしても、それに応じて筒部１０も変形し、回転ケース３端部の外周面３ｂと蓋部材６の筒部１０との間に隙間が生じることはなく、シール性を維持し続けることができる。その結果、回転ケース３内の潤滑油の漏洩を防止することができる。   As described above, according to the traveling unit 1 of the present embodiment, the rotary case 3 and the lid member 6 are formed by fitting the inner peripheral surface 10a of the cylindrical portion 10 of the lid member 6 to the outer peripheral surface 3b of the end of the rotary case 3. , Even if the rotating case 3 tries to deform outward in the radial direction, the deformation is suppressed by the cylindrical portion 10 of the lid member 6. Further, even if the rotating case 3 is slightly deformed outward, the cylindrical portion 10 is also deformed accordingly, and a gap is generated between the outer peripheral surface 3b of the end of the rotating case 3 and the cylindrical portion 10 of the lid member 6. And the sealing performance can be maintained. As a result, leakage of lubricating oil in the rotating case 3 can be prevented.

また、前記したように、第１厚肉部９ａ、薄肉部９ｂ、および第２厚肉部９ｃを有するように底部９を形成している。これにより、底部９は、薄肉部９ｂで弾性変形しやすい。そのため、回転ケース３がその径方向外側へ変形しようとした際に、筒部１０に作用する荷重は底部９の弾性変形でも受けることができる。すなわち、回転ケース３が径方向外側へ変形しようとした際には、筒部１０は無理なくその変形に追従することができ、蓋部材６の破損を防止することができる。なお、底部９の外側中心部に形成された凹部９ｄも、底部９の弾性変形のしやすさに寄与する。   Further, as described above, the bottom portion 9 is formed so as to have the first thick portion 9a, the thin portion 9b, and the second thick portion 9c. Thereby, the bottom part 9 is easy to elastically deform in the thin part 9b. Therefore, when the rotating case 3 tries to deform outward in the radial direction, the load acting on the cylindrical portion 10 can be received even by elastic deformation of the bottom portion 9. That is, when the rotating case 3 tries to be deformed outward in the radial direction, the cylindrical portion 10 can follow the deformation without difficulty, and the lid member 6 can be prevented from being damaged. In addition, the concave portion 9d formed in the outer central portion of the bottom portion 9 also contributes to the ease of elastic deformation of the bottom portion 9.

また、回転ケース３端部の外周面３ｂと筒部１０の内周面１０ａとの間にＯリング８を配置することで、回転ケース３がその径方向外側へ変形しようとするときでも、または、回転ケース３がその径方向外側へ変形したときでも、回転ケース３端部の外周面３ｂと蓋部材６の筒部１０の内周面１０ａとの間でＯリング８は挟持され続ける。これにより、回転ケース３内の潤滑油の漏洩をより防止することができる。   Further, by arranging the O-ring 8 between the outer peripheral surface 3b at the end of the rotating case 3 and the inner peripheral surface 10a of the cylindrical portion 10, even when the rotating case 3 is going to deform outward in the radial direction, or Even when the rotating case 3 is deformed radially outward, the O-ring 8 continues to be sandwiched between the outer peripheral surface 3b at the end of the rotating case 3 and the inner peripheral surface 10a of the cylindrical portion 10 of the lid member 6. Thereby, the leakage of the lubricating oil in the rotating case 3 can be further prevented.

なお、図２に、回転ケース３のケース軸方向の端面３ｅを示している。この端面３ｅと、底部９の内面との間に、Ｏリング８を配置してもよい。   FIG. 2 shows an end surface 3e of the rotating case 3 in the case axial direction. An O-ring 8 may be disposed between the end surface 3 e and the inner surface of the bottom portion 9.

また、筒部１０の内周面１０ａに形成された溝部１０ｂにＯリング８を配置することで、Ｏリング８のつぶし代が大きくなり、シール性をさらに高めることができている。   Further, by disposing the O-ring 8 in the groove portion 10b formed on the inner peripheral surface 10a of the cylindrical portion 10, the crushing allowance of the O-ring 8 is increased, and the sealing performance can be further improved.

また、回転ケース３端部の外周面３ｂに段差をつけることで、蓋部材６の筒部１０の外周面が回転ケース３の外周面よりも外側に張り出す量を低減できる。その結果、これらの外周面と建設機械のクローラとの間に流入した土砂が、この間に溜まることを防止することができる。   Further, by providing a step on the outer peripheral surface 3 b at the end of the rotating case 3, the amount of the outer peripheral surface of the cylindrical portion 10 of the lid member 6 projecting outward from the outer peripheral surface of the rotating case 3 can be reduced. As a result, it is possible to prevent the earth and sand flowing between these outer peripheral surfaces and the crawler of the construction machine from accumulating during this time.

なお、ボルト７は、蓋部材６の筒部１０の外周に６個程度配置することが好ましいが、２〜１０個配置しても良い。また、これらボルト７は均等配置されていることが好ましいが、軸を中心に左右対称に配置するようにしても良い。ボルト７の役割は、ケース軸方向にずれることなく蓋部材６を回転ケース３に固定することである。すなわち、蓋部材６と回転ケース３との間のシール性に関してはボルト７による締め付け力を特に考慮する必要がないので、このようにボルト７の数量を低減することができる。その結果、蓋部材６および回転ケース３の加工・組立性が改善されるとともに、走行ユニット１の製造コストを従来よりも抑えることができる。   In addition, although it is preferable to arrange about six bolts 7 on the outer periphery of the cylindrical portion 10 of the lid member 6, 2 to 10 bolts 7 may be arranged. The bolts 7 are preferably arranged evenly, but may be arranged symmetrically about the axis. The role of the bolt 7 is to fix the lid member 6 to the rotating case 3 without shifting in the case axial direction. That is, regarding the sealing performance between the lid member 6 and the rotary case 3, it is not necessary to consider the tightening force by the bolts 7, and thus the number of the bolts 7 can be reduced in this way. As a result, the processing and assembling properties of the lid member 6 and the rotating case 3 are improved, and the manufacturing cost of the traveling unit 1 can be suppressed as compared with the conventional case.

以上、本発明の実施形態について説明したが、本発明は上述の実施の形態に限られるものではなく、特許請求の範囲に記載した限りにおいて様々に変更して実施することが可能なものである。   Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims. .

１：走行ユニット
２：本体ケース
３：回転ケース
３ａ：内歯
４：モータ機構
５：減速機構
６：蓋部材
７：ボルト（固定手段）
８：Ｏリング（シール）
９：底部
１０：筒部 1: Traveling unit 2: Body case 3: Rotating case 3a: Inner teeth 4: Motor mechanism 5: Deceleration mechanism 6: Lid member 7: Bolt (fixing means)
8: O-ring (seal)
9: Bottom 10: Tube

特開２０００−６５１６４号公報JP 2000-65164 A

Claims (3)

建設機械に固定される本体ケースと、
前記本体ケースに対して回転自在に保持され内周に内歯が形成された回転ケースと、
前記回転ケース内に収納され前記内歯に噛み合う減速機構と、
前記回転ケースの開口を覆う蓋部材と、
前記蓋部材を前記回転ケースに固定する固定手段と、
前記蓋部材と前記回転ケースとの間に配置されたシールと、を備え、
前記蓋部材は、
前記開口を覆う底部と、
前記底部の端からケース軸方向に延在する筒部と、を有し、
前記回転ケース端部の外周面に前記筒部の内周面を嵌合させて、当該回転ケースと前記蓋部材とを固定してなり、
前記シールが、前記回転ケース端部の外周面と前記筒部の内周面との間であって、前記筒部の内周面に形成された溝部に配置されており、
前記固定手段は、前記筒部の外周からケース軸中心に向かって配設されたボルトである、建設機械用走行ユニット。 A main body case fixed to the construction machine;
A rotating case that is rotatably held with respect to the main body case and has inner teeth formed on the inner periphery;
A speed reduction mechanism housed in the rotating case and meshing with the inner teeth;
A lid member covering the opening of the rotating case;
Fixing means for fixing the lid member to the rotating case;
A seal disposed between the lid member and the rotating case,
The lid member is
A bottom covering the opening;
A cylindrical portion extending in the case axial direction from the end of the bottom,
Said the outer peripheral surface of the rotary case end is fitted to the inner peripheral surface of the cylindrical portion, Ri Na to fix the said lid member with the rotatable case,
The seal is disposed between the outer peripheral surface of the end of the rotating case and the inner peripheral surface of the cylindrical portion, and is disposed in a groove formed in the inner peripheral surface of the cylindrical portion;
It said fixing means, Ru bolt der disposed towards the casing axis center from the outer periphery of the tubular portion, construction equipment traveling unit. 請求項１に記載の建設機械用走行ユニットにおいて、
前記回転ケース端部の外周面に、ケース軸中心に向かって落ち込む段差が形成されており、当該段差部に、前記蓋部材の筒部の内周面が嵌合されていることを特徴とする、建設機械用走行ユニット。 In the traveling unit for construction machines according to claim 1,
A step is formed on the outer peripheral surface of the end portion of the rotating case toward the center of the case axis , and the inner peripheral surface of the cylindrical portion of the lid member is fitted to the step portion. A traveling unit for construction machinery. 請求項１または２に記載の建設機械用走行ユニットにおいて、In the traveling unit for construction machines according to claim 1 or 2,
前記溝部が、前記ボルトよりも、前記蓋部材の底部側に設けられていることを特徴とする、建設機械用走行ユニット。The traveling unit for construction machines, wherein the groove is provided closer to the bottom of the lid member than the bolt.
JP2009008446A 2009-01-19 2009-01-19 Traveling unit for construction machinery Active JP5342248B2 (en)

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EP2957795B1 (en) 2013-02-18 2019-11-06 Nok Corporation Sealing structure
JP6318456B2 (en) * 2013-08-12 2018-05-09 株式会社不二越 Reducer device for construction machine travel
EP2881623A1 (en) * 2013-12-05 2015-06-10 Continental Automotive GmbH Actuator
FR3116039A1 (en) * 2020-11-12 2022-05-13 Jtekt Europe Casing of a power steering system device provided with a cover
FR3136441A1 (en) * 2022-06-13 2023-12-15 Jtekt Europe Method of attaching a cover to an orifice of a power steering system and such a cover

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JPS58158853U (en) * 1982-04-17 1983-10-22 カヤバ工業株式会社 Fixing mechanism of reducer cover for construction machine running
JPS61119658U (en) * 1985-01-14 1986-07-28
JPH0355956U (en) * 1989-10-05 1991-05-29
JPH05157144A (en) * 1991-12-04 1993-06-22 Hitachi Constr Mach Co Ltd Epicycle reduction gear
JP3160513B2 (en) * 1995-11-13 2001-04-25 日立建機株式会社 Crawler driving planetary gear reducer
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