CN1175195C

CN1175195C - Rolling ball screw having cooling channel

Info

Publication number: CN1175195C
Application number: CNB011100885A
Authority: CN
Inventors: 卓永财
Original assignee: Hiwin Technologies Corp
Current assignee: Hiwin Technologies Corp
Priority date: 2001-03-30
Filing date: 2001-03-30
Publication date: 2004-11-10
Anticipated expiration: 2021-03-30
Also published as: CN1377755A

Abstract

The present invention relates to a rolling ball screw which is provided with a cooling medium circulating channel in a screw nut. Both sides of the screw nut are respectively provided with an end cap of which the inner part is provided with a plurality of grooves. The grooves of the end caps on both of the two sides are used for connecting a plurality of cooling through holes arranged in the screw nut into the cooling medium circulating channel. The cooling medium is supplied into the cooling medium circulating channel from an inlet for cooling the screw nut. After the heat energy is absorbed, the cooling medium is discharged to the outside from an outlet.

Description

Ball screw with cooling channel

Technical field

The invention belongs to a kind of ball screw, be meant a kind of ball screw that in nut, is provided with the cooling medium circulation canal especially.

Background technique

The type of cooling of ball screw commonly used, mainly be that screw portion central position axially in this ball screw digs and is provided with an axial bore, and its inside is embedded with a body usually, body one end is connected with the inlet tube of being located at screw rod one end, its the other end then be located at the outer pipe of screw rod and be connected side, make cooling liquid one-way flows such as oil, water or cooling medium partly inner, and carried outside the high heat that is produced when ball screw rotates in screw rod.The major defect of above-mentioned design is:

1) since the spiro rod length of general ball screw all much larger than the length of nut, and the steel ball circulatory system is arranged at nut inside, after the ball screw running, the time ratio screw rod per unit area that the inner per unit area of nut contacts with the circulation steel ball is high with the time that the circulation steel ball contacts, therefore the heat major part that is produced that turns round concentrates on the nut, make the nut temperature be relatively higher than extruder temperature, and the above-mentioned hollow ball screw commonly used direct relatively low screw portion of chilling temperature only, can't effectively cool off on the contrary for the nut part that temperature is higher, whole cooling effect is more not remarkable;

2) this hollow ball screw is generally applied in the toolroom machine of high feed rate, because axial bore processing difficulties, be difficult to require the concentricity of this axial bore, so cause when running up, having the eccentric force of one-period property to produce, cause the oscillation phenomenon of board, this machining accuracy for toolroom machine has suitable adverse influence;

3) because factors such as the length of hollow screw and external diameters, its restriction is arranged when the processing axial bore, processing cost is higher, and its cooling liquid inlet pipe and outer pipe are divided into the both sides of screw portion, need take the bigger space that is provided with, so be difficult to be installed in narrow space, cause inconvenience and restriction in the application; And

4) external diameter that is subject to hollow screw limits, and its cooling liquid is difficult to form a backflow design in hollow screw, only can unidirectionally make the heat exchanger time of cooling liquid and screw rod quite very brief by hollow screw, and rate of heat exchange is difficult to effective lifting.

Summary of the invention

The purpose of this invention is to provide a kind of ball screw with cooling channel, it can directly cool off the nut part that produces higher operating temperature, have preferable whole cooling effect, and then make this ball screw hollow screw commonly used be more suitable for high loading and high-velocity tool machine in high feed rate, high loading and high manufacturing accuracy.

A time purpose of the present invention is to provide a kind of ball screw with cooling channel, and its nut is oscillation phenomenon when running up and without acceptance of persons, improves the machining accuracy of toolroom machine.

Another object of the present invention is to provide a kind of cooling channel ball screw that has, can be in the inner return flow type circulation canal that forms cooling medium of nut, can effectively prolong the heat exchanger time of cooling medium and nut, with the heat exchange efficiency of effective lifting cooling medium, and the difficulty of processing is low with respect to the hollow ball screw.

Another purpose of the present invention is to provide a kind of cooling channel ball screw that has, the entry and exit of its cooling medium can be selected directly to be installed on nut or the nut end covers at two sides, it is required be provided with the space much smaller than hollow screw commonly used required the space is set, lay and can adapt to narrow space, lay in this mechanism design glue space for the various machineries that use ball screw as dirivig member (for example toolroom machine etc.), has suitable convenience and applicability.

Ball screw to achieve the above object of the invention with cooling channel, it mainly is the end cap of in the nut both sides are installed with respectively, establishing groove, utilize the groove of both sides end cap several cooling through holes with inner all settings of nut, be connected to become the return flow type circulation canal of a cooling medium, cooling medium is supplied in this circulation canal by an inlet, with the cooling nut, cooling medium drains into the external world by an outlet behind the absorption heat energy.Can be respectively arranged with an anti-drain gasket between this nut and its two side cover, prevent the improper leakage of cooling medium; The entry and exit of this cooling medium can be connected to a cooling medium feeding mechanism respectively simultaneously, form a complete cooling recirculation system, this cooling medium feeding mechanism includes for example known members such as compressor, condenser, expansion valve, is used for the cooling medium of nut absorbed inside heat energy is cooled to a lower operating temperature.

Description of drawings

See also the detailed description and the accompanying drawing thereof of following relevant a preferred embodiment of the present invention, can further understand the technology of the present invention content and purpose effect thereof; Relevant this embodiment's accompanying drawing is:

Fig. 1 has the ball screw axial section of cooling channel for the present invention;

Fig. 2 is the profile of nut part first embodiment in this ball screw;

Fig. 3 is a nut shown in Figure 2 front view partly;

Fig. 4 is the profile of nut part second embodiment in this ball screw;

Fig. 5 is a nut shown in Figure 4 front view partly;

Fig. 6 is the profile of nut both sides end cap partly in this ball screw; And

Fig. 7 is the front view of both sides shown in Figure 6 end cap.

Embodiment

Embodiment:

See also Fig. 1, ball screw 10 provided by the present invention, several cool off the nut 20 of through holes 21 to include a screw rod 11 of form known, most individual steel ball 12, a steel ball circulatory system 13 and major technique features of the present invention tool partly; This steel ball 12 is placed between this screw rod 11 and the nut 20, and utilizes this steel ball circulatory system 13 to make its shuttling movement; When screw rod 11 rotation, can drive this nut 20 and do a linear motion, make this ball screw 10 can be used as the work feeder of machinery such as toolroom machine for example via this steel ball 12.

The present invention offers the cooling through hole 21 that several run through this nut 20 vertically in these nut 20 inside, enter this nut 20 inside for having a cooling medium of setting the operating temperature value, and carry out heat exchange with nut 20, to take away the heats that 12 of this nut 20 and steel balls are produced because of the circulation friction; This cooling medium refers to comprise the various materials that liquid, gas etc. have cooling effect.

The end cap 23 (as Figure 6 and Figure 7) of at least one groove 24 of tool in these nut 20 both sides are set with respectively, utilize groove 24 several cooling through holes 21 that these nut 20 inside are set of both sides end cap 23, be connected to become the return flow type circulation canal of a cooling medium, this cooling medium is supplied in this return flow type circulation canal by an inlet 25, in order to the cooling nut, the cooling medium behind the absorption heat energy is discharged the outside of nuts 20 by an outlet 26.

This nut 20 and 23 of its both sides end caps can be respectively arranged with an anti-drain gasket, prevent the improper leakage of cooling medium, this leakage prevention sheet 22 must be in response to the position of set groove 24 on this both sides end cap 23, offer the through hole 27 of same position and equal number, make it not influence cooling medium in this return flow type circulation canal free flow.

The anti-drain gasket 22 in this both sides end cap 23 and both sides can be embedded in the end face inside, both sides of this nut 20 as shown in Figures 2 and 3; Or as on Fig. 4 and the side, two ends that is locked in this nut 20 shown in Figure 5.

The inlet 25 of above-mentioned cooling medium and export 26 two openings that lay respectively at this return flow type circulation canal, and it can be set on the both sides end face of this nut 20 as shown in Figures 2 and 3; Or as on Fig. 4 and the outer peripheral surface that is set at this nut 20 shown in Figure 5; Or be set on the end face or outer peripheral surface of this both sides end cap 23; Or according to the position configuration of actual demand.

The inlet 25 of this cooling medium is connected to a cooling medium feeding mechanism (scheming not shown) respectively with outlet 26, form a complete cooling recirculation system, this cooling medium feeding mechanism includes for example known members such as compressor, condenser, expansion valve, in order to will be in nut 20 absorbed inside heat energy and cooling medium that temperature raises is cooled to low operating temperature, make its circulation enter this nut 20 inside again, carry out heat exchange.

Ball screw with cooling channel provided by the present invention when comparing mutually with the aforementioned common technology of offering the cooling through hole in screw rod inside, has more following advantage:

1) can directly cool off the nut part that produces higher operating temperature, has preferable whole cooling effect, and then make this ball screw hollow screw commonly used more be applicable to the Modern High-Speed toolroom machine of high feed rate and high manufacturing accuracy, can guarantee the precision of ball screw and the working life of improving ball screw simultaneously;

2) the return flow type circulation canal of cooling medium can be formed in nut inside, but not, the heat exchanger time of cooling medium and nut can be effectively prolonged, with the heat exchange efficiency of effective lifting cooling medium as using the one-way flow through hole of technology always;

3) because nut is to do a linear motion, so nut there is no the eccentric oscillation phenomenon that hollow screw commonly used easily produces when high speed rotating, for the machining accuracy of toolroom machine do not cause any must not influence, more can relatively effectively promote the machining accuracy of toolroom machine;

4) entry and exit of cooling medium can be selected directly to be installed on nut or the nut end covers at two sides, it is required be provided with the space much smaller than hollow screw commonly used required the space is set, lay and can adapt to narrow space, lay in mechanism design and space for the various machinery that uses ball screw as dirivig member (for example toolroom machine etc.), has suitable convenience and applicability; And

5) user only need utilize general joint to connect the inlet and the outlet of this return flow type circulation canal, can import cooling medium nut inside is cooled off, and assemble to have quite easy convenience.

Above-listed detailed description is at the specifying of possible embodiments of the present invention, but this embodiment is not in order to limiting claim of the present invention, does not allly break away from the equivalence that the technology of the present invention content does and implements or change, all should be contained in the claim of the present invention.

Claims

1, a kind of ball screw with cooling channel, comprise a screw rod, to be driven and make the nut of a linear motion, most steel ball circulatory systems that are placed in the steel ball between this screw rod and this nut and impel this steel ball shuttling movement, it is characterized in that along this screw rod by this screw rod:

This nut inside be provided with at least one cooling but medium circulate in the cooling through hole that runs through this nut in it;

The end cap of at least one groove of tool in wherein this nut is installed with respectively at its both sides, this cooling through hole that this groove is inner set with this nut is connected to become one and has an inlet and a cooling medium circulation canal that exports.

2, the ball screw with cooling channel according to claim 1 is characterized in that: wherein be respectively arranged with an anti-drain gasket between this nut and this both sides end cap.