JPH11336969A - Rotary joint - Google Patents
Rotary jointInfo
- Publication number
- JPH11336969A JPH11336969A JP10142532A JP14253298A JPH11336969A JP H11336969 A JPH11336969 A JP H11336969A JP 10142532 A JP10142532 A JP 10142532A JP 14253298 A JP14253298 A JP 14253298A JP H11336969 A JPH11336969 A JP H11336969A
- Authority
- JP
- Japan
- Prior art keywords
- shaft
- seal member
- hollow
- rotary joint
- interlocking
- 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
Classifications
-
- 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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L27/00—Adjustable joints, Joints allowing movement
- F16L27/08—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe
- F16L27/0804—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe the fluid passing axially from one joint element to another
- F16L27/0808—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe the fluid passing axially from one joint element to another the joint elements extending coaxially for some distance from their point of separation
- F16L27/0812—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe the fluid passing axially from one joint element to another the joint elements extending coaxially for some distance from their point of separation with slide bearings
- F16L27/082—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe the fluid passing axially from one joint element to another the joint elements extending coaxially for some distance from their point of separation with slide bearings having axial sealing
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Joints Allowing Movement (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、工作機械の主軸な
どに流体を供給するロータリージョイントに関し、とく
に、高速回転に適したロータリージョイントに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary joint for supplying a fluid to a main shaft of a machine tool, and more particularly to a rotary joint suitable for high-speed rotation.
【０００２】[0002]
【従来の技術】ロータリージョイントとは、工作機械な
どにおいて、回転部へ固定部から流体を供給するために
回転部と固定部とを流体的に接続するものである。工作
機械などの中には、主軸などの回転部品が回転するとき
に接触部に生ずる摩擦や磨耗を低減させるために、回転
部品の先端に、潤滑液、冷却液、空気などを送り込む構
造をもつものがあり、このような場合にロータリージョ
イントが一般的に使われている。2. Description of the Related Art A rotary joint fluidly connects a rotating part and a fixed part in a machine tool or the like in order to supply a fluid to the rotating part from a fixed part. Some machine tools have a structure that sends lubricating fluid, cooling fluid, air, etc. to the tip of the rotating part to reduce friction and wear generated at the contact part when the rotating part such as the spindle rotates. In such cases, rotary joints are commonly used.
【０００３】従来の工作機械用ロータリージョイントと
しては、特開平９−１００９７６号公報に開示されてい
るものがある。このロータリージョイントは、ハウジン
グ内に、軸心に流体通路が設けられた回転部材と、軸心
に流体通路が設けられ、常時後方へ付勢されチェック弁
機能を有するピストン部材とを備える。またこのピスト
ン部材内に、常時ピストン部材に対して前方に付勢さ
れ、軸心に流体通路が設けられた押圧部材が設けられ、
押圧部材と回転部材との対向面に一対のシール部材が固
着されている。このような構造により、流体供給路から
液体が供給される場合には、供給された液体の圧力によ
り、ピストン部材が前方へ移動し、一対のシール部材が
接触状態になり、液体はピストン内を流通して、主軸先
端部へ供給される。また液体の供給を止め、加圧空気供
給口から加圧空気を供給する場合は、一対のシール部材
の間隙を通して、主軸内の流体通路へ加圧空気を供給す
ることができる。A conventional rotary joint for machine tools is disclosed in Japanese Patent Application Laid-Open No. 9-100976. This rotary joint includes, in a housing, a rotating member provided with a fluid passage at an axial center, and a piston member provided with a fluid passage at an axial center and constantly urged rearward and having a check valve function. In addition, a pressing member that is constantly urged forward with respect to the piston member and has a fluid passage provided in the axial center is provided in the piston member,
A pair of seal members are fixed to the opposing surfaces of the pressing member and the rotating member. With such a structure, when the liquid is supplied from the fluid supply path, the piston member moves forward due to the pressure of the supplied liquid, the pair of seal members come into contact with each other, and the liquid flows through the piston. It circulates and is supplied to the tip of the spindle. When the supply of the liquid is stopped and the compressed air is supplied from the compressed air supply port, the compressed air can be supplied to the fluid passage in the main shaft through the gap between the pair of seal members.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上記のような
従来のロータリージョイントでは、ピストン部材内に押
圧部材を挿入するという構造を採用しているため、ピス
トン部材内に、押圧部材や、この押圧部材を前方へ付勢
するバネなどを格納するスペースおよび構造を必要とす
る。よって、ピストン部材を格納するハウジングが大き
くなり、ロータリージョイントをコンパクトに設計する
のが難しかった。コンパクトに設計しようとすると、液
体供給路の内管径が小さくなるため、この液体供給路の
流通量が少なくなるなどの問題が生じるからである。However, since the conventional rotary joint as described above employs a structure in which a pressing member is inserted into the piston member, the pressing member and the pressing member are inserted into the piston member. A space and a structure for storing a spring or the like for urging the member forward are required. Therefore, the housing for accommodating the piston member becomes large, and it has been difficult to design a compact rotary joint. This is because if the size of the liquid supply passage is reduced, the inner diameter of the liquid supply passage becomes small.
【０００５】また、従来のロータリージョイントでは、
一対のシール部材を固着する際に、その取付精度を厳し
く管理する必要があった。この取付精度が悪いと、主軸
が高速回転する際の回転振れによってシール部材同士の
摺動面積が変動し、シール部材の一方が他方よりも磨耗
が大きくなる偏磨耗が生じたり、シール性能が低下した
りという問題が生じるからである。In a conventional rotary joint,
When fixing the pair of seal members, it is necessary to strictly control the mounting accuracy. If this mounting accuracy is poor, the sliding area between the seal members fluctuates due to rotational run-out when the main shaft rotates at high speed, and one of the seal members will wear more than the other, causing uneven wear or degrading the sealing performance. This is because a problem of drip occurs.
【０００６】本発明は、これら問題点に鑑み、主軸の高
速回転にともなうシール部材の偏磨耗などを防止し、コ
ンパクト設計の可能なロータリージョイントを得んとす
るものである。SUMMARY OF THE INVENTION In view of the above problems, the present invention is to prevent the uneven wear of the seal member due to the high-speed rotation of the main shaft, and to obtain a rotary joint which can be designed compact.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するた
め、本発明の第１のロータリージョイントは、内部に中
空路を有し、主軸に該主軸と共に回転状態に取り付けら
れ、該中空路の後端開口部に第１シール部材を取り付け
られた回転軸体と、内部に中空路を有し、該中空路の前
端開口部に第２シール部材を取り付けられたハウジング
と、を備え、前記回転軸体とハウジングとが、前記第１
シール部材および第２シール部材を接触させ、かつ回転
軸体の中空路とハウジングの中空路とを連通させるよう
に、同軸に配設され、前記の連通した中空路を流体が流
通するロータリージョイントであって、前記回転軸体
が、主軸と連動回転し内部に中空路を有する連動軸体
と、内部に中空路を有し該中空路の後端開口部に第１シ
ール部材を取り付けられ、前記連動軸体に対して軸方向
に移動可能かつ軸回転不可能にされた移動軸体と、を備
えるとともに、前記移動軸体が前記連動軸体に対して後
方向へ弾性付勢され、かつ前記移動軸体の後方向への移
動を制限するストッパーが連動軸体に設けられて構成さ
れるものである。In order to achieve the above object, a first rotary joint according to the present invention has a hollow passage therein, and is mounted on a main shaft so as to rotate with the main shaft, and is provided behind the hollow passage. A rotary shaft body having a first seal member attached to an end opening, a housing having a hollow passage therein, and a second seal member attached to a front end opening of the hollow passage; The body and the housing
A rotary joint, which is disposed coaxially so that the seal member and the second seal member are brought into contact with each other and communicates the hollow passage of the rotary shaft and the hollow passage of the housing, and through which the fluid passes through the communicated hollow passage. Wherein the rotating shaft is interlocked with a main shaft and has an interlocking shaft having a hollow passage therein, and a first seal member is attached to the rear end opening of the hollow passage having a hollow passage therein; A movable shaft that is movable in the axial direction with respect to the interlocking shaft and that is not rotatable, and the movable shaft is elastically biased rearward with respect to the interlocking shaft, and A stopper for restricting the movement of the moving shaft in the backward direction is provided on the interlocking shaft.
【０００８】また、本発明の第２のロータリージョイン
トは、内部に中空路を有し、主軸に該主軸と共に回転状
態に取り付けられ、該中空路の後端開口部に第１シール
部材を取り付けられた回転軸体と、内部に中空路を有
し、固定されたハウジング内に軸方向に移動可能かつ軸
回転不可能な状態で配設され、該中空路の前端開口部に
第２シール部材を取り付けられたフローティングシート
と、を備え、前記回転軸体とフローティングシートと
が、第１シール部材および第２シール部材が対向するよ
うに配設され、前記フローティングシートが軸方向に移
動し、第１シール部材および第２シール部材が接触する
ことにより、フローティングシートの中空路と回転軸体
の中空路とが連通することにより流体供給路が形成さ
れ、該流体供給路を流体が流通するロータリージョイン
トであって、前記回転軸体が、主軸と連動回転し内部に
中空路を有する連動軸体と、内部に中空路を有し該中空
路の後端開口部に第１シール部材を取り付けられ、前記
連動軸体に対して軸方向に移動可能かつ軸回転不可能に
された移動軸体と、を備えるとともに、前記移動軸体が
前記連動軸体に対して後方向へ弾性付勢され、かつ前記
移動軸体の後方向への移動を制限するストッパーが連動
軸体に設けられて構成されるものである。The second rotary joint of the present invention has a hollow passage therein, is mounted on the main shaft in a rotating state together with the main shaft, and has a first seal member mounted on the rear end opening of the hollow passage. A rotating shaft body, and a hollow passage therein, disposed in a fixed housing so as to be axially movable and non-rotatable, and a second seal member is provided at a front end opening of the hollow passage. A floating sheet attached thereto, wherein the rotating shaft body and the floating sheet are disposed so that a first seal member and a second seal member face each other, and the floating sheet moves in the axial direction, When the seal member and the second seal member are in contact with each other, the hollow path of the floating sheet and the hollow path of the rotary shaft communicate with each other to form a fluid supply path. A rotary joint that circulates, wherein the rotary shaft body rotates interlockingly with a main shaft and has an internal hollow path, and a first seal member having a hollow path inside and a rear end opening of the hollow path. And a movable shaft that is axially movable and non-rotatable with respect to the interlocking shaft, and the moving shaft is elastically rearwardly attached to the interlocking shaft. A stopper that is urged and restricts the backward movement of the moving shaft is provided on the interlocking shaft.
【０００９】ここで、前記フローティングシートが後方
向へ弾性付勢されており、前記ハウジングにフローティ
ングシートへ通じる流体出入孔が設けられ、該流体出入
孔から供給される流体の圧力により前記フローティング
シートが前記弾性付勢に抗して軸方向に移動することに
より、前記第１シール部材および第２シール部材が接触
して流体供給路を形成することができる。Here, the floating sheet is elastically urged rearward, and the housing is provided with a fluid inlet / outlet communicating with the floating sheet, and the pressure of the fluid supplied from the fluid inlet / outlet causes the floating sheet to be opened. By moving in the axial direction against the elastic bias, the first seal member and the second seal member come into contact with each other to form a fluid supply path.
【００１０】または、前記ハウジングに対して前記フロ
ーティングシートが前方向へ弾性付勢され、第１シール
部材および第２シール部材を接触状態のまま用いること
もできる。Alternatively, the floating sheet may be elastically urged forward with respect to the housing, and the first seal member and the second seal member may be used in a contact state.
【００１１】[0011]
【発明の実施の形態】以下、図面を参照しながら、本発
明に係る代表的な種々の実施例を説明する。図１は、本
発明に係る第１のロータリージョイントの中心軸を含む
断面図である。本実施例のロータリージョイント1 は、
回転軸体2 と、この回転軸体2 を保持するハウジング3
とを備える。ハウジング3 には、後端部に液体や気体な
どの流体を流入するための流体注入孔4 、内部にその流
体が流通する中空路5 、およびこの中空路5 の前端開口
部に取り付けられたシール部材6 が設けられている。実
際の使用時には、ハウジング3 は取付孔7 ，8 にネジな
どを用いて外部の固定部に固定される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, various embodiments according to the present invention will be described with reference to the drawings. FIG. 1 is a sectional view including a central axis of a first rotary joint according to the present invention. The rotary joint 1 of this embodiment is
Rotating shaft body 2 and housing 3 for holding this rotating shaft body 2
And The housing 3 has a fluid injection hole 4 for flowing a fluid such as a liquid or a gas at a rear end thereof, a hollow passage 5 through which the fluid flows, and a seal attached to a front end opening of the hollow passage 5. A member 6 is provided. At the time of actual use, the housing 3 is fixed to an external fixing portion using screws or the like in the mounting holes 7 and 8.
【００１２】また、前記回転軸体2 は、主軸9 に固定さ
れる連動軸体10と、この連動軸体10に対して軸方向に移
動可能ではあるが軸回転不可能にされた移動軸体11とか
らなる。移動軸体11は、連動軸体10の内部に軸平行に固
定されたガイドピン12，13と係合することにより、軸方
向に移動を制限されかつ軸回転運動が不可能とされてい
る。また、この移動軸体11は連動軸体10に対して弾性部
材14によって後方向へ弾性付勢されるとともに、連動軸
体10の内周に設けられたストップリング15によって、後
方向への移動距離を制限されている。さらに、移動軸体
11の内部の中空路16の後端開口部には、シール部材17
が、前記のハウジングに取り付けられたシール部材6 と
対向し接触するようにして取り付けられている。なお、
前記のシール部材6 ，17の材質としては、一方は、Ｓｉ
Ｃ、ＷＣなどの高硬度部材が用いられ、他方は、用途に
より、特殊な高硬度部材、またはカーボンなどの比較的
低硬度のものが用いられる。The rotating shaft 2 is provided with an interlocking shaft 10 fixed to the main shaft 9 and a moving shaft which is axially movable with respect to the interlocking shaft 10 but is not rotatable. Consists of 11 The moving shaft 11 is limited in movement in the axial direction by engaging with guide pins 12 and 13 fixed to the inside of the interlocking shaft 10 in a direction parallel to the axis, and is not allowed to rotate in the axial direction. The moving shaft 11 is elastically urged rearward by an elastic member 14 with respect to the interlocking shaft 10, and is moved rearward by a stop ring 15 provided on the inner periphery of the interlocking shaft 10. The distance is limited. In addition, the moving shaft
At the rear end opening of the hollow passage 16 inside the
Are attached so as to face and contact the seal member 6 attached to the housing. In addition,
One of the materials for the seal members 6 and 17 is Si
A high-hardness member such as C or WC is used, and a special high-hardness member or a relatively low-hardness member such as carbon is used depending on the application.
【００１３】また、図１に示すように、前記連動軸体10
は、実際の使用時には、主軸9 に取り付けられて主軸9
の回転とともに軸回転し、この軸回転に伴い移動軸体11
も軸回転し、前記のシール部材6 ，17は接触・摺動す
る。これにより、ハウジング後端部の流体注入孔4 から
供給される滑油、冷却液または空気などの流体が漏れな
く主軸9 の先端へ供給されるのである。なお、漏れなく
流体を供給するために、封止部材であるＯリング18,19
が、移動軸体11と連動軸体10との間および連動軸体10と
主軸9 との間に設けられている。As shown in FIG. 1, the interlocking shaft 10
Is attached to the spindle 9 during actual use.
The shaft rotates with the rotation of the shaft.
The shaft members also rotate, and the aforementioned seal members 6 and 17 come into contact and slide. As a result, fluid such as lubricating oil, cooling liquid or air supplied from the fluid injection hole 4 at the rear end of the housing is supplied to the tip of the main shaft 9 without leakage. In order to supply the fluid without leakage, O-rings 18 and 19, which are sealing members, are used.
Are provided between the moving shaft 11 and the interlocking shaft 10 and between the interlocking shaft 10 and the main shaft 9.
【００１４】このように、本実施例のロータリージョイ
ント1 では、前記シール部材同士が接触・摺動する際、
たとえ主軸9 の軸振れが生じたとしても、弾性部材14が
その振れを吸収するとともに、シール部材同士の摺動か
ら生じる摩擦熱によるシール部材6,17の熱膨張も前記弾
性部材14によって吸収されるため、シール部材6 ，17の
摺動面積の変動は最小限に抑えられる。よって、シール
部材の一方が偏磨耗することが著しく減るとともにシー
ル性能が向上し、ロータリージョイントの耐久性が向上
する。また、従来、シール部材の偏磨耗を避けるべく、
シール部材の取り付け精度を厳しく管理する必要があっ
たが、上記の構造を採用することにより、その必要性が
減ることとなる。As described above, in the rotary joint 1 according to the present embodiment, when the seal members contact and slide with each other,
Even if shaft run-out of the main shaft 9 occurs, the elastic member 14 absorbs the run-out, and thermal expansion of the seal members 6, 17 due to frictional heat generated by sliding of the seal members is also absorbed by the elastic member 14. Therefore, the fluctuation of the sliding area of the seal members 6 and 17 can be minimized. Therefore, uneven wear of one of the seal members is significantly reduced, the sealing performance is improved, and the durability of the rotary joint is improved. Conventionally, in order to avoid uneven wear of the seal member,
Although it was necessary to strictly control the mounting accuracy of the seal member, the necessity is reduced by adopting the above structure.
【００１５】次に、本発明に係る第２のロータリージョ
イントについて説明する。図２と図３は、このロータリ
ージョイント20の中心線を含む断面図である。本実施例
のロータリージョイント20は、回転軸体21と、フローテ
ィングシート22と、これら回転軸体21およびフローティ
ングシート22を保持するハウジング23とから構成され
る。Next, a second rotary joint according to the present invention will be described. 2 and 3 are cross-sectional views including the center line of the rotary joint 20. FIG. The rotary joint 20 according to the present embodiment includes a rotating shaft 21, a floating seat 22, and a housing 23 that holds the rotating shaft 21 and the floating seat 22.
【００１６】前記ハウジング23は、後端部に液体や気体
などの流体を流入するための流体注入孔24と、フローテ
ィングシート22を軸方向へ移動させるための流体を出入
する流体出入孔25とを備える。この流体出入孔25から出
入する流体は、図示していない制御装置を用いて制御さ
れ、その流量および圧力が調節される。なお、実際の使
用時には、ハウジング23は取付孔26，27にネジなどを用
いて外部の固定部に固定される。The housing 23 has, at its rear end, a fluid injection hole 24 for inflow of a fluid such as liquid or gas, and a fluid outlet hole 25 for inflow and outflow of a fluid for moving the floating sheet 22 in the axial direction. Prepare. The fluid flowing in and out of the fluid inlet / outlet 25 is controlled using a control device (not shown), and the flow rate and pressure are adjusted. At the time of actual use, the housing 23 is fixed to an external fixing portion using screws or the like in the mounting holes 26 and 27.
【００１７】前記フローティングシート22は、ハウジン
グ23に対して軸方向に移動可能ではあるが軸回転不可能
にされ、弾性部材28により後側へ弾性付勢されている。
フローティングシート22は、ハウジング23の内部に軸平
行に固定されたガイドピン29，30と係合することによ
り、軸方向に移動を制限されかつ軸回転運動が不可能と
されている。また、その内部に、前記流体注入孔24から
注入される流体が通る中空路31が設けられ、この中空路
31の前端開口部にはシール部材32が取り付けられてい
る。なお、前記流体注入孔24から注入される流体が漏れ
なく前記中空路31を流通するために、フローティングシ
ート22の後端部とハウジング23との間に、封止部材であ
るＯリング33が設けられている。また、前記流体出入孔
25から出入する流体が漏れないように、フローティング
シート22とハウジング23との間に、封止部材であるＯリ
ング34が設けられている。The floating seat 22 is movable in the axial direction with respect to the housing 23 but is not allowed to rotate, and is elastically urged rearward by an elastic member 28.
The floating seat 22 is limited in axial movement by engaging with guide pins 29 and 30 fixed in parallel to the inside of the housing 23 in the axial direction, and cannot rotate in the axial direction. A hollow passage 31 through which the fluid injected from the fluid injection hole 24 passes is provided therein.
A seal member 32 is attached to the front end opening of 31. An O-ring 33 as a sealing member is provided between the rear end of the floating sheet 22 and the housing 23 so that the fluid injected from the fluid injection hole 24 flows through the hollow path 31 without leakage. Have been. In addition, the fluid access port
An O-ring 34, which is a sealing member, is provided between the floating sheet 22 and the housing 23 so that the fluid flowing in and out of the housing 25 does not leak.
【００１８】前記回転軸体21は、主軸35に固定される連
動軸体36と、この連動軸体36に対して軸方向に移動可能
ではあるが軸回転不可能にされた移動軸体37とからな
る。移動軸体37は、連動軸体36の内部に軸平行に固定さ
れたガイドピン38，39と係合することにより、軸方向に
移動を制限されかつ軸回転運動が不可能とされている。
また、この移動軸体37は連動軸体36に対して弾性部材40
によって後方向へ弾性付勢されるとともに、連動軸体36
の内周に設けられたストップリング41によって、後方向
への移動距離を制限されている。さらに、移動軸体37の
内部の中空路42の後端開口部には、シール部材43が、前
記のフローティングシート22に取り付けられたシール部
材32と対向し接触するようにして取り付けられている。
なお、前記のシール部材32，43の材質としては、一方
は、ＳｉＣ、ＷＣなどの高硬度部材が用いられ、他方
は、用途により、特殊な高硬度部材、またはカーボンな
どの比較的低硬度のものが用いられる。The rotating shaft 21 includes an interlocking shaft 36 fixed to a main shaft 35, and a moving shaft 37 that is movable in the axial direction with respect to the interlocking shaft 36 but is not rotatable. Consists of The moving shaft 37 is restricted in axial movement by engaging with guide pins 38 and 39 fixed in parallel with the shaft inside the interlocking shaft 36, and is not allowed to rotate.
Further, the moving shaft 37 is provided with an elastic member 40 with respect to the interlocking shaft 36.
The elastic shaft is elastically urged rearward by the
The movement distance in the backward direction is limited by a stop ring 41 provided on the inner circumference of the vehicle. Further, a seal member 43 is attached to the rear end opening of the hollow passage 42 inside the moving shaft 37 so as to face and contact the seal member 32 attached to the floating sheet 22.
As the material of the seal members 32 and 43, one is a high-hardness member such as SiC or WC, and the other is a special high-hardness member or a relatively low-hardness material such as carbon depending on the application. Things are used.
【００１９】また、前記連動軸体36は、実際の使用時に
は、主軸35に取り付けられて主軸35の回転とともに軸回
転し、この軸回転に伴い移動軸体37も軸回転する。主軸
先端へ供給する流体が漏洩可能なものである場合、図３
に示すように、前記流体出入孔25から供給される流体の
圧力は、図示していない制御装置によって、フローティ
ングシート22が弾性部材28の弾性付勢力に従って後方向
へ移動するまでに下げられ、シール部材32, 43を非接触
状態とする。一方、主軸先端へ供給する流体が漏洩可能
なものでない場合、図２に示すように、前記流体出入孔
25から供給される流体の圧力は、前記制御装置によっ
て、フローティングシート22が弾性部材28の弾性付勢力
に抗して前方向へ移動しシール部材32, 43が接触するま
で上げられる。このようにして、シール部材同士は接触
・摺動してシール性を発揮し、流体注入孔24から供給さ
れる潤滑油、冷却液または空気などの流体は、漏れなく
主軸先端へ供給されるのである。In the actual use, the interlocking shaft 36 is attached to the main shaft 35 and rotates with the rotation of the main shaft 35. With this rotation, the moving shaft 37 also rotates. When the fluid supplied to the tip of the spindle is leakable, FIG.
As shown in FIG. 3, the pressure of the fluid supplied from the fluid inlet / outlet 25 is reduced by a control device (not shown) until the floating sheet 22 moves rearward in accordance with the elastic urging force of the elastic member 28, and is sealed. The members 32 and 43 are brought into a non-contact state. On the other hand, when the fluid supplied to the spindle tip is not leakable, as shown in FIG.
The pressure of the fluid supplied from 25 is increased by the control device until the floating sheet 22 moves forward against the elastic urging force of the elastic member 28 and the sealing members 32 and 43 come into contact. In this way, the seal members come into contact with each other and slide to exhibit a sealing property, and the fluid such as lubricating oil, cooling liquid, or air supplied from the fluid injection hole 24 is supplied to the tip of the main shaft without leakage. is there.
【００２０】本実施例のこのような構造により、制御装
置により流体出入孔から出入する流体の圧力を調節する
ことで、ロータリージョイントを流通する流体の圧力に
関係なく、フローティングシートを軸方向へ移動させ、
シール部材同士を接触させることができる。また、上記
の第１のロータリージョイントの場合と同じく、上記の
連動軸体36と移動軸体37とからなる回転軸体21を用いる
ことによって、高速回転する主軸の振れやシール部材の
熱膨張が主原因となるシール部材の偏磨耗が著しく減
り、シール性能が向上するため、ロータリージョイント
の耐久性が向上する。With such a structure of this embodiment, the floating sheet is moved in the axial direction regardless of the pressure of the fluid flowing through the rotary joint by adjusting the pressure of the fluid flowing out of the fluid inlet / outlet by the control device. Let
The sealing members can be brought into contact with each other. In addition, as in the case of the first rotary joint, the use of the rotating shaft 21 including the interlocking shaft 36 and the moving shaft 37 reduces the deflection of the high-speed rotating main shaft and the thermal expansion of the seal member. The uneven wear of the sealing member, which is the main cause, is significantly reduced, and the sealing performance is improved, so that the durability of the rotary joint is improved.
【００２１】ところで、本発明のロータリージョイント
では、上記のフローティングシートの軸方向への移動手
段は上記実施例のものに限らない。何れの移動手段であ
っても、上記の連動軸体と移動軸体とからなる回転軸体
を用いることにより、そのシール性能を向上させること
が可能である。たとえば、その移動手段として、電磁石
などを用いてフローティングシートを移動させシール部
材同士を接触状態にするものなどが挙げられる。By the way, in the rotary joint of the present invention, the means for moving the floating seat in the axial direction is not limited to the above embodiment. Regardless of the moving means, it is possible to improve the sealing performance by using the rotating shaft composed of the interlocking shaft and the moving shaft. For example, as the moving means, a means for moving the floating sheet using an electromagnet or the like to bring the sealing members into contact with each other may be used.
【００２２】また、上記実施例では、回転軸体は主軸本
体に取り付けられていたが、本発明では、これに限ら
ず、回転軸体は、主軸に装着されたドローバーやクラン
クバーなどの主軸を構成する部品に取り付けられていて
も良い。In the above embodiment, the rotary shaft is attached to the main spindle body. However, the present invention is not limited to this, and the rotary shaft may be a main shaft such as a draw bar or a crank bar mounted on the main shaft. It may be attached to the constituent parts.
【００２３】[0023]
【発明の効果】上述の如く、本発明のロータリージョイ
ントは、主軸と連動回転し内部に中空路を有する連動軸
体と、内部に中空路を有し該中空路の後端開口部に第１
シール部材を取り付けられ、前記連動軸体に対して軸方
向に移動可能かつ軸回転不可能にされた移動軸体と、を
備えるとともに、前記移動軸体が前記連動軸体に対して
後方向へ弾性付勢され、かつ前記移動軸体の後方向への
移動を制限するストッパーが連動軸体に設けられている
ので、シール部材同士の摩擦熱によるシール部材の熱膨
張や主軸の振れが前記弾性付勢によって吸収されるの
で、シール部材同士の摺動面積の変動が減り、シール部
材の偏磨耗が著しく減り、ロータリージョイントの耐久
性が向上する。As described above, the rotary joint according to the present invention is provided with an interlocking shaft body that rotates interlockingly with the main shaft and has a hollow passage inside, and a first end at the rear end opening of the hollow passage that has a hollow passage inside.
A moving member axially movable relative to the interlocking shaft and non-rotatable with a seal member attached thereto, and the moving shaft is moved rearward relative to the interlocking shaft. Since the stopper which is elastically urged and restricts the movement of the moving shaft body in the backward direction is provided on the interlocking shaft body, thermal expansion of the sealing member due to heat of friction between the sealing members and deflection of the main shaft are caused by the elasticity. Since it is absorbed by the bias, fluctuations in the sliding area between the seal members are reduced, uneven wear of the seal members is significantly reduced, and the durability of the rotary joint is improved.
【図１】本発明に係る第１のロータリージョイントを示
す断面図である。FIG. 1 is a sectional view showing a first rotary joint according to the present invention.
【図２】本発明に係る第２のロータリージョイントであ
ってシール部材同士が接触状態にある断面図である。FIG. 2 is a cross-sectional view of a second rotary joint according to the present invention, in which seal members are in contact with each other.
【図３】本発明に係る第２のロータリージョイントであ
ってシール部材同士が非接触状態にある断面図である。FIG. 3 is a cross-sectional view of a second rotary joint according to the present invention, in which seal members are not in contact with each other.
1 ロータリージョイント 2 回転軸体 3 ハウジング 4 流体注入孔 5 中空路 6 シール部材 7, 8 取付孔 9 主軸 10 連動軸体 11 移動軸体 12, 13 ガイドピン 14 弾性部材 15 ストップリング 16 中空路 17 シール部材 18 Ｏリング 20 ロータリージョイント 21 回転軸体 22 フローティングシート 23 ハウジング 24 流体注入孔 25 流体出入孔 26, 27 取付孔 28 弾性部材 29, 30 ガイドピン 31 中空路 32 シール部材 33, 34 Ｏリング 35 主軸 36 連動軸体 37 移動軸体 38, 39 ガイドピン 40 弾性部材 41 ストップリング 42 中空路 43 シール部材 1 Rotary joint 2 Rotary shaft 3 Housing 4 Fluid injection hole 5 Hollow passage 6 Seal member 7, 8 Mounting hole 9 Main shaft 10 Interlocking shaft 11 Moving shaft 12, 13 Guide pin 14 Elastic member 15 Stop ring 16 Hollow passage 17 Seal Member 18 O-ring 20 Rotary joint 21 Rotary shaft 22 Floating seat 23 Housing 24 Fluid injection hole 25 Fluid inlet / outlet 26, 27 Mounting hole 28 Elastic member 29, 30 Guide pin 31 Hollow path 32 Seal member 33, 34 O-ring 35 Main shaft 36 Interlocking shaft 37 Moving shaft 38, 39 Guide pin 40 Elastic member 41 Stop ring 42 Hollow path 43 Seal member
Claims (4)
に回転状態に取り付けられ、該中空路の後端開口部に第
１シール部材を取り付けられた回転軸体と、内部に中空
路を有し、該中空路の前端開口部に第２シール部材を取
り付けられたハウジングと、を備え、前記回転軸体とハ
ウジングとが、前記第１シール部材および第２シール部
材を接触させ、かつ回転軸体の中空路とハウジングの中
空路とを連通させるように、同軸に配設され、前記の連
通した中空路を流体が流通するロータリージョイントで
あって、前記回転軸体が、主軸と連動回転し内部に中空
路を有する連動軸体と、内部に中空路を有し該中空路の
後端開口部に第１シール部材を取り付けられ、前記連動
軸体に対して軸方向に移動可能かつ軸回転不可能にされ
た移動軸体と、を備えるとともに、前記移動軸体が前記
連動軸体に対して後方向へ弾性付勢され、かつ前記移動
軸体の後方向への移動を制限するストッパーが連動軸体
に設けられて構成されることを特徴とするロータリージ
ョイント。1. A rotary shaft body having a hollow passage therein, mounted on a main shaft for rotation with the main shaft, and having a first seal member mounted on a rear end opening of the hollow passage; A housing having a second seal member attached to a front end opening of the hollow path, wherein the rotating shaft body and the housing contact the first seal member and the second seal member, and A rotary joint that is coaxially disposed so that the hollow path of the rotating shaft and the hollow path of the housing communicate with each other, and through which the fluid flows through the communicating hollow path, wherein the rotating shaft is interlocked with a main shaft. An interlocking shaft that rotates and has a hollow path inside, a first seal member is attached to the rear end opening of the hollow path that has a hollow path inside, and is movable in the axial direction with respect to the interlocking shaft; A moving shaft that is not allowed to rotate. In addition, the moving shaft is elastically urged rearward with respect to the interlocking shaft, and a stopper for restricting the moving shaft in the rearward direction is provided on the interlocking shaft. A rotary joint.
に回転状態に取り付けられ、該中空路の後端開口部に第
１シール部材を取り付けられた回転軸体と、内部に中空
路を有し、固定されたハウジング内に軸方向に移動可能
かつ軸回転不可能な状態で配設され、該中空路の前端開
口部に第２シール部材を取り付けられたフローティング
シートと、を備え、前記回転軸体とフローティングシー
トとが、第１シール部材および第２シール部材が対向す
るように配設され、前記フローティングシートが軸方向
に移動し、第１シール部材および第２シール部材が接触
することにより、フローティングシートの中空路と回転
軸体の中空路とが連通することにより流体供給路が形成
され、該流体供給路を流体が流通するロータリージョイ
ントであって、前記回転軸体が、主軸と連動回転し内部
に中空路を有する連動軸体と、内部に中空路を有し該中
空路の後端開口部に第１シール部材を取り付けられ、前
記連動軸体に対して軸方向に移動可能かつ軸回転不可能
にされた移動軸体と、を備えるとともに、前記移動軸体
が前記連動軸体に対して後方向へ弾性付勢され、かつ前
記移動軸体の後方向への移動を制限するストッパーが連
動軸体に設けられて構成されることを特徴とするロータ
リージョイント。2. A rotary shaft body having a hollow passage therein, mounted on the main shaft so as to rotate with the main shaft, and having a first seal member mounted on a rear end opening of the hollow passage; A floating seat, which is disposed in a fixed housing so as to be movable in the axial direction and non-rotatable in the axial direction, and has a second seal member attached to a front end opening of the hollow path. The rotating shaft and the floating sheet are disposed such that a first seal member and a second seal member face each other, the floating sheet moves in an axial direction, and the first seal member and the second seal member come into contact with each other. Thereby, a fluid supply path is formed by communication between the hollow path of the floating sheet and the hollow path of the rotary shaft body, and the rotary joint through which fluid flows through the fluid supply path, A rotating shaft is interlockingly rotated with the main shaft and has a hollow passage inside, and a first seal member is attached to the rear end opening of the hollow passage having a hollow passage inside, and the interlocking shaft has A movable shaft that is axially movable and non-rotatable, and the movable shaft is elastically biased rearward with respect to the interlocking shaft, and the movable shaft is A rotary joint, wherein a stopper for restricting backward movement is provided on the interlocking shaft.
性付勢されており、前記ハウジングにフローティングシ
ートへ通じる流体出入孔が設けられ、該流体出入孔から
供給される流体の圧力により前記フローティングシート
が前記弾性付勢に抗して軸方向に移動することにより、
前記第１シール部材および第２シール部材が接触して流
体供給路が形成されることを特徴とする請求項２記載の
ロータリージョイント。3. The floating sheet is elastically urged rearward, and the housing is provided with a fluid inlet / outlet communicating with the floating sheet. By moving in the axial direction against the elastic bias,
The rotary joint according to claim 2, wherein the first seal member and the second seal member are in contact with each other to form a fluid supply path.
ングシートが前方向へ弾性付勢され、第１シール部材お
よび第２シール部材を常時接触状態にする請求項２記載
のロータリージョイント。4. The rotary joint according to claim 2, wherein the floating sheet is elastically urged forward with respect to the housing, so that the first seal member and the second seal member are always in a contact state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14253298A JP4228411B2 (en) | 1998-05-25 | 1998-05-25 | Rotary joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14253298A JP4228411B2 (en) | 1998-05-25 | 1998-05-25 | Rotary joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11336969A true JPH11336969A (en) | 1999-12-07 |
| JP4228411B2 JP4228411B2 (en) | 2009-02-25 |
Family
ID=15317553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14253298A Expired - Lifetime JP4228411B2 (en) | 1998-05-25 | 1998-05-25 | Rotary joint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4228411B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005212088A (en) * | 2004-02-02 | 2005-08-11 | Kuroda Precision Ind Ltd | Floating tool holder |
| CN102080749A (en) * | 2009-12-01 | 2011-06-01 | 杜布林公司 | Rotary union with selectively controlled seal |
| JP2013253644A (en) * | 2012-06-07 | 2013-12-19 | Rix Corp | Rotary joint |
| JP2014040915A (en) * | 2012-08-03 | 2014-03-06 | Deublin Co | Rotary union with pressure controlled seal actuator |
| US10465826B2 (en) | 2013-11-28 | 2019-11-05 | Rix Corporation | Rotary joint |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013009759A1 (en) * | 2013-06-11 | 2014-12-11 | Christian Maier Gmbh & Co. Kg Maschinenfabrik | Device for transporting media |
-
1998
- 1998-05-25 JP JP14253298A patent/JP4228411B2/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005212088A (en) * | 2004-02-02 | 2005-08-11 | Kuroda Precision Ind Ltd | Floating tool holder |
| JP4580658B2 (en) * | 2004-02-02 | 2010-11-17 | 黒田精工株式会社 | Floating tool holder |
| CN102080749A (en) * | 2009-12-01 | 2011-06-01 | 杜布林公司 | Rotary union with selectively controlled seal |
| EP2330327A1 (en) * | 2009-12-01 | 2011-06-08 | Deublin Company | Rotary union with selectively controlled seal |
| KR20110061475A (en) * | 2009-12-01 | 2011-06-09 | 듀블린캄파니 | Rotary union with selesctively controlled seal |
| JP2011127757A (en) * | 2009-12-01 | 2011-06-30 | Deublin Co | Rotary joint with selectively controlled seal |
| US8453675B2 (en) | 2009-12-01 | 2013-06-04 | Deublin Company | Rotary union with selectively controlled seal |
| TWI548828B (en) * | 2009-12-01 | 2016-09-11 | 都柏林公司 | Rotary union with selectively controlled seal and method for operating the same |
| JP2013253644A (en) * | 2012-06-07 | 2013-12-19 | Rix Corp | Rotary joint |
| JP2014040915A (en) * | 2012-08-03 | 2014-03-06 | Deublin Co | Rotary union with pressure controlled seal actuator |
| US10465826B2 (en) | 2013-11-28 | 2019-11-05 | Rix Corporation | Rotary joint |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4228411B2 (en) | 2009-02-25 |
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