CN105587849A - Transmission device for double-helical axial dynamic sealing - Google Patents
Transmission device for double-helical axial dynamic sealing Download PDFInfo
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- CN105587849A CN105587849A CN201410652008.6A CN201410652008A CN105587849A CN 105587849 A CN105587849 A CN 105587849A CN 201410652008 A CN201410652008 A CN 201410652008A CN 105587849 A CN105587849 A CN 105587849A
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- shaft
- seal
- transmission device
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- transmission shaft
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Abstract
The invention discloses a transmission device for double-helical axial dynamic sealing. The transmission device for double-helical axial dynamic sealing comprises a box, a transmission shaft and a shaft seal, wherein the transmission shaft is sleeved with the shaft seal, and the interior and the exterior of the box are sealed through the shaft seal. The transmission shaft is located on the inner side of the shaft seal and forms a threaded sealing shaft section. A threaded shaft hole in clearance fit with the threaded sealing shaft section is formed in the box. The spreading direction of threads of the threaded sealing shaft section and the threaded shaft hole is from inside to outside and is identical with the rotating direction of the transmission shaft. According to the transmission device for double-helical axial dynamic sealing, when the transmission shaft rotates at a high speed, lubricating oil in a gap is pumped back into the box by means of the pushing action of the threaded sealing shaft section and the threaded shaft hole, the situation that an excessive amount of lubricating oil acts on an oil seal is prevented, and the load of the oil seal is reduced; in this way, the oil seal can be made of a soft material, and abrasion of the oil seal to the transmission shaft is avoided; in addition, the soft material of the oil seal has good adaptability, and lubricating oil leakage caused by assembly problems in the initial stage is avoided. The transmission device is suitable for the transmission shaft rotating in only one direction.
Description
Technical field
The present invention relates to a kind of mechanical assembly, particularly a kind of mechanical device for transmission.
Background technology
Transmission device is that motive power is passed to the middle device that next device is exported, and comprises gearbox, bearing housing etc.; It is the indispensable device of universal machine. Such as gearbox, the high rotating speed of engine, motor can be transmitted to output by after slowing down, reach the object of use; Certainly, also there is the transmission device of the speedup of realizing, need to manufacture according to practice; Bearing housing is mainly applicable to supporting drive shaft and carries out transmission, and the stability of holding device operation, certainly, also can form certain bearing installing space as required in gearbox.
Transmission device generally comprises casing and power transmission shaft, also has other parts according to kind difference, such as gear etc.; Owing to being provided with the high-speed rotary part such as bearing, gear, for reducing friction, reducing rotary resistance, adopt lubricating oil to carry out lubricating between friction pair, be one of necessary condition of device long-period stable operation. When rotatable parts run up, can drive the lubricating oil in casing to splash, be conducive to distribution the lubrication friction pair of lubricating oil; But because power is inputted or exported by power transmission shaft, therefore, the lubricating oil movable sealing problem in casing is the subject matter that those skilled in the art face.
In prior art, the lubricating oil movable sealing of transmission device generally adopts outside framework oil seal form, can play good sealing effectiveness; But outside framework oil seal, because long period friction can produce wearing and tearing, particularly gets rid of in transmission device in the situation that oil mass is larger, a large amount of lubricating oil acts on outside framework oil seal, adds the pumping effect of power transmission shaft itself, can make lubricating oil produce and leak; And outside framework oil seal owing to there is no break-in, also can cause the leakage of lubricating oil at the assembling initial stage; And in order to ensure that long period uses, the material require of outside framework oil seal has certain intensity, can produce wearing and tearing to power transmission shaft itself, affects the performance of power transmission shaft.
Therefore, need a kind of transmission device, its movable sealing is improved, can effectively avoid oil leak, and can use by long period, reduce maintenance frequency, save use cost.
Summary of the invention
In view of this, the object of this invention is to provide the transmission device of a kind of double-screw shaft to movable sealing, oil leak can be effectively avoided in movable sealing, and can extend its service life, reduces maintenance frequency, saves use cost.
Double-screw shaft of the present invention is to the transmission device of movable sealing, comprise casing, power transmission shaft and be enclosed within on power transmission shaft for making the shaft seal of external seal in casing, described power transmission shaft is positioned at shaft seal inner side and forms thread seal shaft part, on casing, form the screw thread axis hole with thread seal shaft part matched in clearance, the screw thread expansion direction of described thread seal shaft part is identical with the rotation direction of power transmission shaft from inside to outside, and the screw thread expansion direction of screw thread axis hole is identical with the rotation direction of power transmission shaft from inside to outside.
And then described power transmission shaft is by bearings in casing, described bearing is positioned at inner side, thread spindle hole;
And then described casing is provided with support rim vertically, described screw thread axis hole is arranged at support rim, and support rim arranged outside is for installing the end cap of shaft seal;
And then, support rim to and casing between detachable being fixedly connected with;
And then described transmission device is speed changer or bearing housing;
And then described shaft seal is skeleton rubber oil seal.
The invention has the beneficial effects as follows: double-screw shaft of the present invention is to the transmission device of movable sealing, in oil sealing inner side, thread seal shaft part and the screw thread axis hole with its matched in clearance are set, and determine the expansion direction of screw thread according to the rotation direction of power transmission shaft, in the time of power transmission shaft high speed rotating, utilize the impetus of thread seal shaft part and screw thread axis hole itself, make lubricating oil in gap by blowback casing, prevent that the lubricating oil of a greater number from acting on oil sealing, reduce oil sealing burden; Thereby oil sealing can be selected softer material, avoid thus the wearing and tearing of oil sealing to power transmission shaft, and softer oil sealing material has good adaptability, avoid because the lubricating oil that initial stage assembly problem causes leaks; The present invention is applicable to the single transmission device turning to of power transmission shaft and uses, and oil leak can be effectively avoided in movable sealing, and can extend its service life, reduces maintenance frequency, saves use cost.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described.
Accompanying drawing is structural representation of the present invention.
Detailed description of the invention
Accompanying drawing is structural representation of the present invention, as shown in the figure: the double-screw shaft of the present embodiment is to the transmission device of movable sealing, comprise casing 5, power transmission shaft 1 and be enclosed within on power transmission shaft 1 for making the shaft seal 8 of casing 5 interior external seals, described power transmission shaft 1 is positioned at shaft seal 8 inner sides and forms thread seal shaft part 7, on casing 5, form the screw thread axis hole 3 with thread seal shaft part 7 matched in clearance, the screw thread expansion direction of described thread seal shaft part 7 is identical with the rotation direction of power transmission shaft 1 from inside to outside, and the screw thread expansion direction of screw thread axis hole 3 is identical with the rotation direction of power transmission shaft 1 from inside to outside; Referring to from inside to outside by interior outside casing 5 herein.
Owing to adopting helicitic texture, lubricating oil is under the threaded function of rotating, push back in casing, reduce by the lubricating oil of gap-contact oil sealing, the lubricating oil that thread seal shaft part throws away radially enters in the screw thread of screw thread axis hole, under the definite prerequisite of screw thread expansion direction, lubricating oil can flow back to casing, prevents from leaking; The present invention utilizes the pumping effect of splash power and the power transmission shaft itself of lubricating oil itself, prevents that lubricating oil from leaking, and alleviates oil sealing load, extends the life cycle of movable sealing.
In the present embodiment, described power transmission shaft 1 is supported in casing 5 by bearing 6, and described bearing 6 is positioned at screw thread axis hole 3 inner sides; Utilize bearing lubrication, assurance device is stablized long-term operation.
In the present embodiment, described casing 5 is provided with outward extending vertically support rim 4, described screw thread axis hole 3 is arranged at support rim 4, support rim 4 arranged outside are for installing the end cap 2 of shaft seal 8, as shown in the figure, end cap 2 is by bolt or the detachable outside end face that is arranged at support rim 4 of screw; Utilize support rim can effectively ensure axiality and the stability of strutting system of power transmission shaft, ensure that thread seal shaft part has enough installing spaces simultaneously, make whole apparatus structure simply compact, support rim forms the balanced support structure that is positioned at casing outside, is beneficial to assurance device stable operation.
In the present embodiment, described transmission device is speed changer or bearing housing; The present embodiment adopts gearbox.
In the present embodiment, detachable being fixedly connected with between described support rim 3 and casing 5, as shown in the figure, adopts screw or through bolt to connect, and static seal pad can be set, and reaches good result of use; This structure for convenience detach and install, simple and compact for structure, easy to make, assembling and installation effectiveness high.
In the present embodiment, described shaft seal 8 is skeleton rubber oil seal, and cost is lower, and material has softer characteristic, can be adapted to preferably the geometrical defect that power transmission shaft itself exists, and reaches good sealing effectiveness; Certainly, owing to having double spiral seal structure, shaft seal also can adopt the structure of conventional soft packing seal, can when static, realize good sealing effectiveness, when rotation, due to double helix effect, also can reach good sealing effectiveness.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (6)
1. a double-screw shaft is to the transmission device of movable sealing, comprise casing, power transmission shaft and be enclosed within on power transmission shaft for making the shaft seal of external seal in casing, it is characterized in that: described power transmission shaft is positioned at shaft seal inner side and forms thread seal shaft part, on casing, form the screw thread axis hole with thread seal shaft part matched in clearance, the screw thread expansion direction of described thread seal shaft part is identical with the rotation direction of power transmission shaft from inside to outside, and the screw thread expansion direction of screw thread axis hole is identical with the rotation direction of power transmission shaft from inside to outside.
2. double-screw shaft according to claim 1, to the transmission device of movable sealing, is characterized in that: described power transmission shaft is by bearings in casing, and described bearing is positioned at inner side, thread spindle hole.
3. double-screw shaft according to claim 2 is to the transmission device of movable sealing, it is characterized in that: described casing is provided with outward extending support rim vertically, described screw thread axis hole is arranged at support rim, and support rim arranged outside is for installing the end cap of shaft seal.
4. double-screw shaft according to claim 3, to the transmission device of movable sealing, is characterized in that: detachable being fixedly connected with between described support rim and casing.
5. double-screw shaft according to claim 4, to the transmission device of movable sealing, is characterized in that: described transmission device is speed changer or bearing housing.
6. double-screw shaft according to claim 5, to the transmission device of movable sealing, is characterized in that: described shaft seal is skeleton rubber oil seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410652008.6A CN105587849A (en) | 2014-11-18 | 2014-11-18 | Transmission device for double-helical axial dynamic sealing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410652008.6A CN105587849A (en) | 2014-11-18 | 2014-11-18 | Transmission device for double-helical axial dynamic sealing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105587849A true CN105587849A (en) | 2016-05-18 |
Family
ID=55927656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410652008.6A Pending CN105587849A (en) | 2014-11-18 | 2014-11-18 | Transmission device for double-helical axial dynamic sealing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105587849A (en) |
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2014
- 2014-11-18 CN CN201410652008.6A patent/CN105587849A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160518 |