CN2639617Y

CN2639617Y - Improved structure of ball screw

Info

Publication number: CN2639617Y
Application number: CN 03205799
Authority: CN
Inventors: 马汝麟; 陈佳筠; 解德泉
Original assignee: Luting Science & Technology Co Ltd
Current assignee: Luting Science & Technology Co Ltd
Priority date: 2003-08-15
Filing date: 2003-08-15
Publication date: 2004-09-08
Anticipated expiration: 2013-08-15

Abstract

The utility model discloses an improved structure for a ball screw, which at least comprises a screw, a screw cap, two reflux blocks and a plurality of steel balls; wherein, the two reflux blocks are arranged at both ends of the screw cap and one side of the reflux block forms a ball passage; the ball passage bottom part forms a convex surface. When assembled, the reflux blocks are arranged at the end part of the screw cap; one end of the ball passage for the reflux block corresponds to the reflux passage of the screw cap and the other end corresponds to the spiral channel flow at the inner wall surface of the screw cap. The steel balls arranged inside the reflux passage can enter the ball passage and the spiral channel flow to contact the surface of the screw; the structure has the advantages of easy processing and more conveniently assembling the reflux blocks.

Description

The structure improvement of ball screw

Technical field

The utility model relates to a kind of structure improvement of ball screw.

Background technique

General positioning screw is broadly divided into two kinds, the one side of being tooth screw rod, and another is a ball screw.Side's tooth screw rod is because back clearance (backlash) is very big, can produce bigger machine error between moving repeatedly, and because of being sliding friction between nut and screw rod, so motor can be comparatively painstaking when driving, therefore discomfort is set up jointly to be located at and is done precision positioning on the motor and use.

Ball screw has improved the problem of square tooth screw rod.In general, ball screw comprises a screw rod and a nut, and wherein the thick place of the meat of nut offers the backflow road that runs through, and disposes the backflow piece outside the end of this nut, communicate with the backflow road and should the backflow piece have passage, a plurality of in addition steel balls are arranged in backflow road and the passage.When screw rod group was located at nut axial, the steel ball that is positioned at backflow piece place rested on the surface of contact of nut axial inner and screw rod friction, makes this screw rod contact with nut and becomes rolling friction when sliding, and therefore when promotion, motor is comparatively laborsaving.In the manufacture process of this ball screw, can adopt comparatively accurate manufacturing process in addition,, be fit to do precision positioning and use so the error of its back clearance is very little.

Above-mentioned ball screw is widely used in the Positioning Precision Control of various machineries, generally comprises precision tool machine (Precision machine tools), industrial machine (Industrialmachinery), electric mechanical (Electronic machinery) and conveying mechanism (Transport machinery).

In above-mentioned ball screw structure, the backflow piece must be included, and the inside of nut should be the backflow piece be located at by group.For example No. 465695 novel patent case of Taiwan patent announcement, No. 443446 novel patent case and No. 524300 novel patent case have all disclosed a kind of backflow piece (lid) structure that is assembled in nut inside, more particularly, case has all disclosed and has a kind ofly radially organized structure into backflow piece (lid) from nut before above-mentioned each patent.The group of this kind backflow piece (lid) is established mode can be for the zone of this backflow piece installation because of must upwards setting out in the footpath of nut, so in manufacturing processing higher technology must be arranged, comparison inconvenience relatively therefore seems.In addition; upwards install back the stream piece by the footpath; can make backflow piece location relatively more inconvenient; it seems by the disclosed content of case before above-mentioned each patent; all be to utilize the mode that clamps the location; this kind mode piece that is difficult to guarantee to reflux can be located really, and therefore not only inconvenient in assembling, the locating effect of this backflow piece is not good yet.

The model utility content

Main purpose of the present utility model is to provide a kind of structure improvement of ball screw of easy processing.

Secondary objective of the present utility model is to provide a kind of structure improvement of easy for installation, ball screw that the location is firm.

For achieving the above object, technical solution of the present utility model is: a kind of structure improvement of ball screw, comprise screw rod, nut, backflow piece and one group of steel ball, this backflow piece group is located at the end of nut, and the one side has two concave curved surfaces towards nut inside, between this two concave curved surface one spacing is arranged; And opposite side that should the backflow piece offers Yi Zhudao, and projecting surface is formed on the bottom of Zhu Dao, and the backflow road offered of the corresponding nut of the end of Zhu Dao, the spiral channel that the then corresponding nut internal face of the other end of Zhu Dao is made.

This nut end is provided with a shape and the size indentation suitable with this backflow piece, and this backflow piece is assembled in the indentation.

This backflow piece is provided with a lock ear, then is provided with the lockhole relative with this lock ear on the nut, and a lock member is worn and locked this lock ear the backflow piece is locked.

After adopting such scheme, owing to the utility model is established the backflow piece in the nut both ends of the surface with axial mode group, rather than adopt the mode of establishing of radially organizing, therefore not needing upwards to set out in the footpath of nut can be for the zone of this backflow piece installation, thereby processing is very easy to, reduces cost.

In addition, the utility model backflow piece can be built in the formed indentation of nut, and forms the part of nut, so its volume is significantly less than general group of volume that is located at the outer externally connected type backflow piece of nut end face, has the advantage that reduces material volume and cost.Moreover with general built-in backflow piece relatively, the utility model is directly installed on the axial end portion of nut, and disclosed backflow piece must radially being pressed into so that should the backflow piece form the blocking location from nut in the prior art, so the utility model is obviously easy than prior art on assembly operation.

In addition, the utility model backflow piece is provided with the lock ear, and the lockhole of the corresponding nut of this pin ear passes the lock ear with a locked assembly again and is positioned in the lockhole, thereby makes the backflow piece can strong fix.

Description of drawings

Fig. 1 is an External view of the present utility model;

Fig. 2 is nut of the present utility model and inner assembly exploded view thereof;

Fig. 3 is a structural representation of the present utility model;

Fig. 4 is the stereo appearance figure of the utility model backflow piece;

Fig. 5 is the floor map of the utility model backflow piece;

Fig. 6 is the utility model backflow piece side plane schematic representation in addition;

Fig. 7 is the utility model backflow piece and nut assembling exploded view.

Embodiment

See also shown in Figure 1ly, the ball screw that discloses among the figure comprises screw rod 10 and nut 20.This screw rod is located at the axial of nut 20 for 10 groups.

See also shown in Fig. 2,3, these nut 20 inner walls are provided with spiral channel 22, and wall thickness 24 positions of nut 20 are along axially offering a backflow road 26.An indentation 28 is respectively established at 26 the two ends of should refluxing, offer a lockhole 29 on this indentation 28.Should backflow road 26 interior groups be provided with a reflow pipe 32 in addition, this reflow pipe 32 can be involuted by the halfbody of two semicircle tubuloses.The inside of this external reflow pipe 32 is equipped with a plurality of steel balls 38.

See also shown in Figure 2ly, each group is provided with a backflow piece 34 at the two ends of this nut 20.Please cooperate Fig. 4 to shown in Figure 6, a side of this backflow piece 34 forms two relative concave curved surfaces 341,342, and at a distance of an intersegmental distance 343, and vertical width of two concave curved surfaces 341,342 has tilt variation between these two concave curved surfaces 341,342.Opposite side that again should backflow piece 34 offers a pearl road 344, and outside the spacing 343 of these pearl road 344 correspondences between two concave curved surfaces 341,342, and projecting surface 345 is formed on the bottom in this pearl road 344.In addition, also be provided with a lock ear 346 on this backflow piece 34.

See also shown in Figure 7, the shape size of indentation 28 that is opened in these nut 20 ends is suitable with backflow piece 34, and should backflow piece 34 be two concave curved surfaces 341,342 towards the surface of nut 20 inside, so should be located in the indentation 28 for 34 groups by the backflow piece, thus the part of formation nut 20.In addition because the lock ear 346 of this backflow piece 34 is relative with the lockhole 29 of indentation 28, so can utilize locked assembly 347 to be worn locking bit.

See also shown in Fig. 3,7, after group was set the position, these formed pearl road, backflow piece 34 1 sides 344 1 ends were corresponding to the end in backflow road 26, spiral channel 22 places of then corresponding nut 20 walls of the other end in this pearl road 344.So be arranged in the plural steel ball 38 of 26 inside, backflow road, 38 of steel balls that are positioned at end position can expose this bump 345.

Please consult shown in Figure 2ly again, be equipped with a location piece 42, a wiper sheet 44 and a wiper cover 46 at the two end part of nut 20 in addition.Wherein: this wiper sheet 44 makes with pin letter cloth and it contains lubricant oil.When 10 groups of screw rods were located at nut 20 axial, two can contact with the surface of screw rod 10 steel ball 38 that should nut 20 internal faces, and this wiper sheet 44 also can contact with the surface of screw rod 10.

During use, this nut 20 and screw rod 10 relative movement, and,, thereby can reduce noise because each steel ball 38 is little with the collision sound of the reflow pipe 32 of plastic material because each steel ball 38 is to be contained in the reflow pipe 32 that plastic material makes.

Even more noteworthy, because this backflow piece 34 is built in the inside of nut 20, so the volume of the disclosed built-in backflow piece 34 of the utility model can be significantly less than general group of volume that is located at the outer externally connected type backflow piece of nut end face, has the advantage that reduces material volume and cost.Moreover with general built-in backflow piece relatively, the utility model is the axial end portion that is directly installed on nut 20, and disclosed backflow piece must radially being pressed into so that should the backflow piece form the blocking location from this nut in the prior art, so the utility model is obviously easy than prior art on assembly operation.

Again because 34 groups of ends that are located at nut 20 of backflow piece provided by the utility model, so can establish lock ear 346 on the backflow piece 34 and on this nut 20, establish lockhole 29, and make this lock ear 346 can be to should lockhole 29 and be beneficial to locked assembly 347 and wear lock, therefore backflow piece 34 of the present utility model has firm locating effect.

In addition because this wiper sheet 44 contains lubricant oil, so this wiper sheet 44 except the dustiness that can strike off screw rod 10 surfaces, more can produce lubrications to screw rod 10 surfaces through contacting with screw rod 10.

Above-mentioned steel ball 38, wiper sheet 44, location piece 42 and backflow piece 34 generally are referred to as the nut inner assembly, and existing corresponding assembly in general ball screw, the utility model is at backflow piece 34 structures, and assembling mode that should backflow piece 34 improved, therefore acting on this and seldom give unnecessary details for the other parts assembly.

Claims

1, a kind of structure improvement of ball screw comprises screw rod, nut, backflow piece and one group of steel ball, and it is characterized in that: this backflow piece group is located at the end of nut, and the one side has two concave curved surfaces towards nut inside, between this two concave curved surface one spacing is arranged; And opposite side that should the backflow piece offers Yi Zhudao, and projecting surface is formed on the bottom of Zhu Dao, and the backflow road offered of the corresponding nut of the end of Zhu Dao, the spiral channel that the then corresponding nut internal face of the other end of Zhu Dao is made.

2, the structure improvement of ball screw as claimed in claim 1 is characterized in that: this nut end is provided with a shape and the size indentation suitable with this backflow piece, and this backflow piece is assembled in the indentation.

3, the structure improvement of ball screw as claimed in claim 1 is characterized in that: this backflow piece is provided with a lock ear, then is provided with the lockhole relative with this lock ear on the nut, and a lock member is worn and locked this lock ear the backflow piece is locked.