JP3162643B2 - Drive seal device for linear actuator - Google Patents
Drive seal device for linear actuatorInfo
- Publication number
- JP3162643B2 JP3162643B2 JP04768997A JP4768997A JP3162643B2 JP 3162643 B2 JP3162643 B2 JP 3162643B2 JP 04768997 A JP04768997 A JP 04768997A JP 4768997 A JP4768997 A JP 4768997A JP 3162643 B2 JP3162643 B2 JP 3162643B2
- Authority
- JP
- Japan
- Prior art keywords
- drive unit
- unit case
- lubricating oil
- drive
- seal member
- 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.)
- Expired - Fee Related
Links
Landscapes
- Sealing Devices (AREA)
Description
【0001】[0001]
【発明の属する技術分野】本発明は、物品或は物体を前
後動或は昇降動させる直線作動機(ジャッキ等を含む)
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear actuator (including a jack or the like) for moving an article or an object back and forth or moving up and down.
About.
【0002】[0002]
【従来の技術】従来、直線作動機は、直線作動軸を進退
動させる駆動部が駆動部ケースに内装され、該駆動部ケ
ース内にグリース等の固形潤滑油が封入されているの
で、駆動部ケースを貫挿して進退動する直線作動軸と駆
動部ケースとの貫挿隙間から前記潤滑油が漏出しないよ
うに、例えば、図2に示すような軸方向に装着されるシ
ール部材Sが取付けられている。2. Description of the Related Art Conventionally, in a linear actuator, a drive unit for moving a linear operation shaft forward and backward is provided in a drive unit case, and a solid lubricating oil such as grease is sealed in the drive unit case. For example, a sealing member S mounted in the axial direction as shown in FIG. 2 is attached so that the lubricating oil does not leak from a penetration gap between the linear operating shaft that penetrates the case and moves forward and backward and the driving unit case. ing.
【0003】すなわち、図2は直線作動機のシール装置
の要部を拡大した断面図であって、外周に螺条Rを刻設
した直線作動軸Aには駆動ナット部材Nが外嵌螺合し、
該ナット部材Nは駆動部ケースH内に軸受Bを介して回
動自在に取付けられ、駆動部ケースH内にはグリス等の
固形潤滑油Gが封入され、前記直線作動軸Aは回転を阻
止されて駆動部ケースを進退動可能に貫挿しており、駆
動ナット部材Nを回転駆動すると、直線作動軸Aは駆動
部ケースHに対して軸線方向に進退動し、直線作動軸A
の先端部に取付けられている被作動体を進退動させる。FIG. 2 is an enlarged sectional view of a main part of a sealing device of a linear actuator. A drive nut member N is externally fitted to a linear operation shaft A having a thread R formed on the outer periphery. And
The nut member N is rotatably mounted in the drive case H via a bearing B, and a solid lubricating oil G such as grease is sealed in the drive case H. The linear operation shaft A prevents rotation. When the drive nut member N is rotationally driven, the linear operation axis A moves in the axial direction with respect to the drive section case H, and the linear operation axis A
The actuated body attached to the tip of the robot moves forward and backward.
【0004】そして、駆動部ケースHと直線作動軸Aと
の貫挿隙間δから駆動部ケースH内に封入された潤滑油
が漏出しないように、駆動ナット部材Nの両端部外周面
と該外周面に対向する駆動部ケース内壁面とで形成され
る軸方向の潤滑油漏洩隙間にOリング等のシール部材S
が圧嵌装入されている。In order to prevent the lubricating oil sealed in the drive unit case H from leaking from the insertion gap δ between the drive unit case H and the linear operation shaft A, the outer peripheral surfaces of both ends of the drive nut member N and the outer periphery are formed. A seal member S such as an O-ring is provided in an axial lubricant leakage gap formed by the inner wall surface of the drive unit case facing the surface.
Are press-fitted.
【0005】[0005]
【発明が解決しようとする課題】上述のように、シール
部材Sを軸方向の潤滑油漏洩隙間に装入すると、該シー
ル部材Sが半径方向および軸方向に遊動離脱しないよう
にするために、駆動部ケースHの内壁にシール部材離脱
阻止段部Dを突設し、さらに、駆動ナット部材Nの両端
部外周面にシール面Fを形成するため、駆動ナット部材
Nの両端部を軸方向に延在させなければならないから、
駆動ナット部材Nの軸方向長さが長大化し、前記シール
部材離脱阻止段部Dを突設するための駆動部ケース肉厚
の肥厚化および駆動ナット部材Nの長大化に伴う駆動部
ケースの軸方向長さの増大が避けられず、駆動部ケース
の小形化に支障を来すという問題点を有していた。As described above, when the seal member S is inserted into the lubricating oil leakage gap in the axial direction, in order to prevent the seal member S from floating and separating in the radial direction and the axial direction, In order to form a seal member detachment prevention step D on the inner wall of the drive unit case H and form seal surfaces F on both outer peripheral surfaces of both ends of the drive nut member N, both ends of the drive nut member N are axially moved. Must be extended,
The axial length of the drive nut member N is increased, the thickness of the drive unit case for projecting the seal member detachment preventing step D is increased, and the shaft of the drive unit case is increased due to the increase in the length of the drive nut member N. Inevitably, the length in the direction is inevitably increased, which hinders downsizing of the drive unit case.
【0006】[0006]
【課題を解決するための手段】そこで、本発明は、駆動
部ケースと直線作動軸との貫挿隙間に連通する駆動ナッ
ト部材の両端面と該両端面に対向する駆動部ケース内壁
面との間に形成されるスラスト方向の潤滑油漏洩隙間に
シート状シール部材を圧嵌固定するシール装置によって
前記課題を解決した。SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a method for forming a drive nut member which is in communication with an insertion gap between a drive case and a linear operating shaft. The above problem has been solved by a sealing device for press-fitting and fixing a sheet-shaped sealing member in a lubricating oil leakage gap in a thrust direction formed therebetween.
【0007】[0007]
【作用】シール部材はスラスト方向の潤滑油漏洩隙間に
装着されているから、駆動ナット部材の両端面と駆動部
ケース内壁面とに挟圧されて軸方向に離脱することがな
く、また、シール部材はシート状であるので、駆動ナッ
ト部材の端面又は駆動ケース内壁面に貼着することによ
り遊動が阻止され、駆動部ケース内に封入されている潤
滑油が直線作動軸と駆動部ケースとの貫挿隙間から漏出
することがない。Since the seal member is mounted in the lubricating oil leakage gap in the thrust direction, the seal member is not pinched between the both end surfaces of the drive nut member and the inner wall surface of the drive portion case and is not separated in the axial direction. Since the member is sheet-shaped, play is prevented by sticking it to the end surface of the drive nut member or the inner wall surface of the drive case, and lubricating oil sealed in the drive unit case causes the linear operation shaft and the drive unit case to be in contact with each other. There is no leakage from the penetration gap.
【0008】[0008]
【実施例】直線作動機の実施例として図1に示すジャッ
キについて説明する。外周に螺条1Aが刻設されている
直線作動軸1が進退動可能に貫挿されている駆動部ケー
ス2は、断面凹状のケース本体2Aと蓋体2Bで構成さ
れ、内部に直線作動軸1の駆動部が収納されている。該
駆動部は、直線作動軸1に外嵌螺合するウォーム歯車3
と該ウォーム歯車3に螺合するウォーム軸4で構成さ
れ、ウォーム歯車3の軸方向両端部は駆動部ケース2に
軸受5,5を介して回転自在に取付けられている。な
お、直線作動軸1は図示しない公知の手段で回転運動を
阻止されている。したがって、ウォーム軸4を介して外
部駆動力をウォーム歯車3に伝達すると、ウォーム歯車
3に螺合している直線作動軸1は回動することなく軸方
向に昇降し、直線作動軸1の頂部に担持している物体等
を扛重又は、降下させる。DESCRIPTION OF THE PREFERRED EMBODIMENTS A jack shown in FIG. 1 will be described as an embodiment of a linear actuator. A drive unit case 2 into which a linear operating shaft 1 having a thread 1A engraved on its outer periphery is removably inserted is constituted by a case main body 2A having a concave cross section and a lid 2B. One drive unit is housed. The drive unit includes a worm gear 3 externally threadedly engaged with the linear operation shaft 1.
And a worm shaft 4 screwed to the worm gear 3. Both ends of the worm gear 3 in the axial direction are rotatably attached to the drive unit case 2 via bearings 5 and 5. The linear motion shaft 1 is prevented from rotating by known means (not shown). Therefore, when the external driving force is transmitted to the worm gear 3 via the worm shaft 4, the linear operation shaft 1 screwed to the worm gear 3 moves up and down in the axial direction without rotating, and the top of the linear operation shaft 1 Lifting or descending objects carried on the boat.
【0009】駆動部ケース2内の駆動部収納空間には、
ウォーム歯車3とウォーム軸4との噛合伝達および軸受
5,5の円滑回転に必要なグリース等の固形潤滑油Gが
封入されているが、該固形潤滑油が雰囲気温度又は噛
合、回動等による発熱に伴って粘性が低下して、直線作
動軸1と駆動部ケース2との貫挿螺条隙間(以下単に貫
挿隙間という)δから漏出するため、該貫挿隙間δに連
通するスラスト方向(直線作動軸1の移動方向に直交す
る方向)の潤滑油漏洩隙間6にシート状シール部材7を
圧嵌し少なくとも該シール部材の一面を接着剤等で貼着
固定して潤滑油の貫挿隙間δへの漏洩を防止する。シー
ト状シール部材6は、耐熱耐摩性の摩擦係数の低いポリ
エステル不織布を環状に形成したものが好ましい。In the drive unit storage space in the drive unit case 2,
Solid lubricating oil G such as grease necessary for meshing transmission between the worm gear 3 and the worm shaft 4 and smooth rotation of the bearings 5 and 5 is sealed. The viscosity decreases due to the heat generation, and leaks from the penetrating screw gap (hereinafter simply referred to as a penetrating gap) δ between the linear operating shaft 1 and the drive unit case 2, so that the thrust direction communicating with the penetrating gap δ A sheet-like sealing member 7 is press-fitted into a lubricating oil leakage gap 6 (in a direction orthogonal to the direction of movement of the linear operating shaft 1), and at least one surface of the sealing member is stuck and fixed with an adhesive or the like to penetrate the lubricating oil. Prevents leakage into gap δ. The sheet-shaped seal member 6 is preferably formed of a polyester nonwoven fabric having a low coefficient of friction with heat resistance and abrasion resistance in an annular shape.
【0010】[0010]
【発明の効果】本発明は、スラスト方向の潤滑油漏洩隙
間6にシール部材7を圧嵌したので、前述した従来技術
における軸方向の潤滑油漏洩隙間にシール部材を装着し
た場合に比し、シール部材を固定保持するシール部材離
脱阻止段部を駆動部ケース内壁に突設する必要がないか
ら、駆動部ケース肉厚の肥厚化が避けられ、また、シー
ル面を形成するためにウォーム歯車の両端を軸方向に延
在させる必要もないから、駆動部ケースの軸方向長さの
長大化が避けられるので、駆動部ケースの小形化が達成
され、さらに、シール部材がシート状であるので、漏洩
隙間が僅少であっても装入可能であるとともに、直線作
動軸に負荷される軸方向荷重がシート状面に分散負荷さ
れてシート部材の耐用寿命を向上させ、そして、シート
状面であるから、貼着面が増大してシート部材の固定力
が確保となり、位置ずれを起すおそれもないし、シール
部材がスラスト方向に装着されているので、直線作動軸
に負荷される荷重によって負荷側シール部材が挟圧され
てシール作用が増大する等のすぐれた効果を有する。According to the present invention, since the seal member 7 is press-fitted in the lubricating oil leakage gap 6 in the thrust direction, compared with the case where the seal member is mounted in the axial lubricating oil leakage gap in the prior art described above, Since there is no need to protrude the seal member detachment preventing step portion for fixing and holding the seal member on the inner wall of the drive unit case, it is possible to avoid thickening of the drive unit case, and to form the seal surface of the worm gear. Since it is not necessary to extend both ends in the axial direction, it is possible to avoid an increase in the axial length of the drive unit case, so that the drive unit case can be reduced in size, and further, since the seal member is sheet-shaped, Even if the leakage gap is small, it can be inserted, and the axial load applied to the linear operating shaft is distributed and loaded on the sheet-like surface to improve the service life of the sheet member. From The seating surface is increased to secure the fixing force of the sheet member, there is no risk of displacement, and since the seal member is mounted in the thrust direction, the load side seal member is pinched by the load applied to the linear operation shaft. It has excellent effects such as an increase in sealing action when pressed.
【図1】 本発明の実施例を示す拡大正面断面図。FIG. 1 is an enlarged front sectional view showing an embodiment of the present invention.
【図2】 従来例の要部拡大断面図。FIG. 2 is an enlarged sectional view of a main part of a conventional example.
1 直線作動軸 2 駆動部ケース 3 ウォーム歯車 4 ウォーム軸 5 軸受 6 スラスト方向潤滑油漏洩隙間 7 シート状シール部材 DESCRIPTION OF SYMBOLS 1 Linear operation shaft 2 Drive part case 3 Worm gear 4 Worm shaft 5 Bearing 6 Thrust direction lubricating oil leakage gap 7 Sheet-shaped seal member
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7,DB名) B66F 3/00 - 3/46 F16J 15/00 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) B66F 3/00-3/46 F16J 15/00
Claims (1)
進退移動可能に支持され外周に螺条を刻設した直線作動
軸と、該作動軸に外嵌螺合した回転駆動ナット部材と、
該ナット部材を軸受を介して回転自在に内装し前記直線
作動軸を進退動自在に貫挿して潤滑油を封入した駆動部
ケースと、を有する直線作動機の駆動部において、駆動
部ケースと直線作動軸との貫挿隙間に連通し、駆動ナッ
ト部材の両端面と該両端面に対向する駆動部ケース内壁
面との間に形成されるスラスト方向の潤滑油漏洩隙間に
シート状シール部材を圧嵌固定したシール装置。1. A linear operating shaft which is prevented from rotating around an axis and is capable of moving forward and backward in the axial direction and has a thread formed on an outer periphery thereof, and a rotary drive nut member externally fitted to the operating shaft. ,
A drive unit case that rotatably mounts the nut member via a bearing and inserts the lubricating oil by penetrating the linear operation shaft so as to be able to move forward and backward. The sheet-like seal member is communicated with the insertion gap with the operating shaft and presses the sheet-like seal member into a thrust-direction lubricating oil leakage gap formed between both end surfaces of the drive nut member and the inner wall surface of the drive unit case facing the both end surfaces. A sealing device that is fitted and fixed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP04768997A JP3162643B2 (en) | 1997-03-03 | 1997-03-03 | Drive seal device for linear actuator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP04768997A JP3162643B2 (en) | 1997-03-03 | 1997-03-03 | Drive seal device for linear actuator |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH10236785A JPH10236785A (en) | 1998-09-08 |
JP3162643B2 true JP3162643B2 (en) | 2001-05-08 |
Family
ID=12782266
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP04768997A Expired - Fee Related JP3162643B2 (en) | 1997-03-03 | 1997-03-03 | Drive seal device for linear actuator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3162643B2 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102107829B (en) * | 2010-12-10 | 2013-08-21 | 程永科 | Manual lifter for extruder |
CN102518322A (en) * | 2011-12-28 | 2012-06-27 | 杭州佳合舞台设备有限公司 | Plane fine-tuning device for lifting stage |
CN102730596B (en) * | 2012-06-25 | 2014-12-31 | 湖北三江航天万峰科技发展有限公司 | Small-stroke and large-torque automatic jacking mechanism |
DE102015116883A1 (en) * | 2015-10-05 | 2017-04-06 | TRüTZSCHLER GMBH & CO. KG | needle loom |
-
1997
- 1997-03-03 JP JP04768997A patent/JP3162643B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH10236785A (en) | 1998-09-08 |
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