CN101462222A - Shrinkage fit connecting method of worm-gear and leadscrew nut for electric cylinder - Google Patents
Shrinkage fit connecting method of worm-gear and leadscrew nut for electric cylinder Download PDFInfo
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- CN101462222A CN101462222A CNA2009100454111A CN200910045411A CN101462222A CN 101462222 A CN101462222 A CN 101462222A CN A2009100454111 A CNA2009100454111 A CN A2009100454111A CN 200910045411 A CN200910045411 A CN 200910045411A CN 101462222 A CN101462222 A CN 101462222A
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- worm wheel
- screw nut
- feed screw
- copper
- worm gear
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Abstract
The invention relates to a method for connecting a worm wheel of an electric cylinder and a feed screw nut through shrinkage fit in the technical field of mechanical engineering. The method adopts shrinkage fit for connection; the worm wheel in the electric cylinder is directly and fixedly connected with the feed screw nut: step one, a copper worm wheel is put into a resistance furnace, and the temperature of the resistance furnace is set to between 190 and 210 DEG C; step two, a temperature measuring sensor is put on the copper worm wheel for measuring the temperature of the copper worm wheel, and when the temperature of the copper worm wheel rises between 190 and 210 DEG C, the the inside diameter of a copper worm wheel hole is expanded to reach requirement of shrinkage fit; step three, the worm wheel is sleeved with the feed screw nut, and in the sleeve process, the clearance amount between the feed screw nut and the worm wheel is kept even; and step four, when the worm wheel enters a setting position, the power supply of the resistance furnace is closed so as to cool and position the worm wheel and the feed screw nut. Compared with the prior bond connection and bolt connection, the shrinkage fit connection can improve transferring precision of the electric cylinder, save materials, reduce the machining procedures, increase the transferred torsion and improve performance of the electric cylinder.
Description
Technical field
The present invention relates to the method that a kind of mechanical engineering technical field driving member connects, specifically, what relate to is a kind of electric cylinder worm gear and feed screw nut shrinkage fit connecting method.
Background technology
Many electric cylinders adopt worm and gear speed-reduction apparatus to realize that deceleration increases torsion effect, and the worm gear of existing electric cylinder has two kinds with the connected mode of feed screw nut: key is connected, screw connects.The shortcoming that adopts key to connect is: have the gap between key and the keyway, this causes between worm gear and the feed screw nut relative displacement being arranged, for the very high ball screw of positioning accuracy request, such relative displacement meeting influences transmission accuracy, its keyway of back that works long hours in addition can produce plastic deformation, causes positioning accuracy further to descend.Can increase manufacturing procedure and adopt screw to connect, the precision of processing is had very high requirement, also more loaded down with trivial details on the structure, and it is less to transmit torque ratio.The hot jacket mounting means is: hot jacket claims hot jacket again, is a kind of technology that realizes the part interference fit, utilizes the characteristic of expanding with heat and contract with cold of metal material that axle and hole are linked together securely.
Find through retrieval prior art, China Patent No.: CN200410016819.3, name is called: main equipment main shaft and rotor hot jacket method, be characterized in adopting the radiations heat energy that produces when being arranged at the energising of epitrochanterian electric heater unit that rotor is heated, make rotor reach the temperature requirement of hot jacket to carry out hot jacket with main shaft.Though it mentions the hot jacket method, two obvious differences are arranged with this invention; One: the application difference, this method is used and main equipment, can not be applied to electric cylinder field; Its two: the hot jacket method application that application difference, this technology are mentioned and main shaft are connected with rotor, rather than are used for being connected between turbine and the feed screw nut.
Summary of the invention
The present invention is directed to deficiency of the prior art and defective, provide a kind of electric cylinder with worm gear and feed screw nut shrinkage fit connecting method, the worm gear interference is connected on the feed screw nut, and worm gear does not need just direct fastening being assemblied on the feed screw nut of connector like this.
The present invention is achieved by the following technical solutions, and the present invention adopts hot jacket to connect, and worm gear directly is connected on the feed screw nut in electric cylinder, comprises the steps:
The first step is put into resistance furnace with copper worm wheel, and resistance furnace temperature is set between 190 degrees centigrade to 210 degrees centigrade and (will changes because temperature is higher than the crystalline phase of 240 bronze medals, and destroy its mechanical performance).
Second step, on copper worm wheel, put temperature transducer, be used to measure the copper worm wheel temperature, when copper worm wheel rising 190 was spent between 210 degree, copper worm wheel was because heating produces expansion, and the worm wheel aperture internal diameter reaches the hot jacket requirement;
Among the present invention, according to the inner and outer diameter size of copper worm wheel and the thermal coefficient of expansion of copper, copper worm wheel is heated to 190 spends between 210 degree, the worm wheel aperture internal diameter just can reach the hot jacket requirement.
The 3rd step, carry out worm gear and screw nut sleeve, in cover and process, keep the gap value of feed screw nut and worm gear even, to avoid scratch feed screw nut surface;
The 4th step, when worm gear enters desired location, close the resistance furnace power supply, make worm gear and feed screw nut cooling location.
The present invention is easy, easy to operate, safe and reliable in order to satisfy main equipment hot jacket connection procedure, accelerates the hot jacket connection speed.And the present invention connects hot jacket to be applied in the electric cylinder, hot jacket is connected be applied in the precision drive.Hot jacket connects and belongs to a kind of interference fit, must guarantee interference in the part material elastic range.Hot jacket connects by the transmission of the stiction between faying face moment of torsion.The size of part depends on the size of external load, factors such as part material.
The present invention has the following advantages: because worm gear is connected on the feed screw nut, worm gear does not have relative twisting with worm screw in the transmittance process, and transmitting accuracy increases.The employing hot jacket connects, and worm gear directly is connected on the feed screw nut, and structure is compact, thus economical with materials; The employing hot jacket connects, and then worm gear and feed screw nut do not need to process screw hole or keyway, reduce manufacturing procedure like this; The hot jacket connection is tightly to be enclosed within the stiction that produces on the feed screw nut by worm gear to transmit moment of torsion, and is bigger than screw connection or key connection transmitting torque.
Description of drawings
Fig. 1 is total figure of the electric cylinder of employing hot jacket connected mode;
Fig. 2 worm gear and feed screw nut interference assembled construction view;
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, be total figure of the electric cylinder that adopts the hot jacket connected mode.Tape label is worm gear 1 and feed screw nut 2 among the figure, diagram worm gear 1 and feed screw nut 2 hot jacket connected modes.
As shown in Figure 2, in electric cylinder, use the hot jacket connected mode that worm gear and feed screw nut are coupled together.In the present embodiment, the material of worm gear 1 is a brass, and the worm gear overall diameter is 130cm, and diameter of bore is 74cm; The material of feed screw nut 2 is ordinary carbon steels, and overall diameter is 74cm, and diameter of bore is 23cm, and concrete implementation step is:
1, at first uses resistance furnace that worm gear 1 is put into resistance furnace, resistance furnace temperature is set between 190 degrees centigrade to 210 degrees centigrade gets final product;
2, on copper worm wheel 1, put temperature transducer, when copper worm wheel 1 temperature rise to 190 spend to 210 the degree between the time, worm gear 1 meets design requirement, the interior hole dimension of worm gear 1 expand into and satisfies the hot jacket connection request;
3, next with copper worm wheel 1 and feed screw nut 1 cover and, gap value is even between maintenance feed screw nut 2 peripheries 4 and copper worm wheel 1 periphery 3 in this process, in this model electricity cylinder because copper worm wheel 1 is 74cm with feed screw nut 2 faying face diameters, so the gap of 4 of copper worm wheel 1 periphery 3 and feed screw nut 2 peripheries is 0.059cm in cover and the process.Copper worm wheel 1 is with feed screw nut 1 cover with till arriving the hot jacket link position, and copper worm wheel 1 worm gear face 5 leans against on the feed screw nut shaft shoulder face 6;
4, after copper worm wheel 1 cooling, tightly be pressed on the periphery 4 of feed screw nut 2.The periphery 3 and feed screw nut 2 peripheries 4 of copper worm wheel 1 have certain interference fit, can guarantee that copper worm wheel 1 is fastened on the feed screw nut 2.
Because copper worm wheel 1 tightly is enclosed within on the feed screw nut 2, there is not relative motion between connector in the present embodiment, so than between traditional key connection or screw connection copper worm wheel 1 and the feed screw nut 2 relative motion being arranged, transmitting accuracy increases.If use key to connect or screw connects, on copper worm wheel 1 and feed screw nut 2, to spline so or the auger shell pit is compared hot jacket and is connected to bother and increased operation again.It is to produce very big stiction by the pressure that copper worm wheel 1 tightly is pressed on the feed screw nut 2 that hot jacket connects transmitting torque, if need transmitting torque to increase, that magnitude of interference that can increase between copper worm wheel 1 and the feed screw nut 2 increases maximum static friction force, and key connects or the screw connection is just very unreliable.
Claims (3)
1, a kind of electric cylinder is characterized in that adopting hot jacket to connect with worm gear and feed screw nut shrinkage fit connecting method, and worm gear directly is connected on the feed screw nut in electric cylinder, comprises the steps:
The first step is put into resistance furnace with copper worm wheel, and resistance furnace temperature is set between 190 degrees centigrade to 210 degrees centigrade;
Second step, on copper worm wheel, put temperature transducer, be used to measure the copper worm wheel temperature, when copper worm wheel rising 190 was spent between 210 degree, copper worm wheel hole internal diameter expanded and reaches the hot jacket requirement;
The 3rd step, carry out worm gear and screw nut sleeve, in cover and process, keep the gap value of feed screw nut and worm gear even;
The 4th step, when worm gear enters desired location, close the resistance furnace power supply, make worm gear and feed screw nut cooling location.
2, electric cylinder according to claim 1 is characterized in that with worm gear and feed screw nut shrinkage fit connecting method the worm gear face of described copper worm wheel leans against on the feed screw nut shaft shoulder face.
3, electric cylinder according to claim 1 is characterized in that the periphery of described copper worm wheel and feed screw nut periphery interference fit with worm gear and feed screw nut shrinkage fit connecting method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100454111A CN101462222A (en) | 2009-01-15 | 2009-01-15 | Shrinkage fit connecting method of worm-gear and leadscrew nut for electric cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100454111A CN101462222A (en) | 2009-01-15 | 2009-01-15 | Shrinkage fit connecting method of worm-gear and leadscrew nut for electric cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101462222A true CN101462222A (en) | 2009-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009100454111A Pending CN101462222A (en) | 2009-01-15 | 2009-01-15 | Shrinkage fit connecting method of worm-gear and leadscrew nut for electric cylinder |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102029502A (en) * | 2011-01-10 | 2011-04-27 | 襄樊市长源东谷实业有限公司 | Hot pressing bush device and hot pressing process of connecting rod piston pin hole |
| CN103261000A (en) * | 2010-12-21 | 2013-08-21 | 蒂森克虏伯普利斯坦有限公司 | Method for the chipless connection of the pinion or input shaft to the torsion bar of a servo steering system |
| CN105458614A (en) * | 2016-01-21 | 2016-04-06 | 中建材（合肥）粉体科技装备有限公司 | Roller press roller shell thermal detachment device and thermal detachment method thereof |
-
2009
- 2009-01-15 CN CNA2009100454111A patent/CN101462222A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103261000A (en) * | 2010-12-21 | 2013-08-21 | 蒂森克虏伯普利斯坦有限公司 | Method for the chipless connection of the pinion or input shaft to the torsion bar of a servo steering system |
| CN103261000B (en) * | 2010-12-21 | 2016-08-24 | 蒂森克虏伯普利斯坦有限公司 | For the method without cutting pinion shaft or power shaft being connected with the torsion bar of assisted power steering system |
| CN102029502A (en) * | 2011-01-10 | 2011-04-27 | 襄樊市长源东谷实业有限公司 | Hot pressing bush device and hot pressing process of connecting rod piston pin hole |
| CN102029502B (en) * | 2011-01-10 | 2013-01-09 | 襄樊市长源东谷实业有限公司 | Hot pressing process of connecting rod piston pin hole |
| CN105458614A (en) * | 2016-01-21 | 2016-04-06 | 中建材（合肥）粉体科技装备有限公司 | Roller press roller shell thermal detachment device and thermal detachment method thereof |
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Open date: 20090624 |