CN201057255Y

CN201057255Y - Improved ballscrew

Info

Publication number: CN201057255Y
Application number: CNU2007201541965U
Authority: CN
Inventors: 李元奎
Original assignee: MEIERDUN BICYCLE INDUSTRY (DONGGUAN) Co Ltd
Current assignee: MEIERDUN BICYCLE INDUSTRY (DONGGUAN) Co Ltd
Priority date: 2007-06-22
Filing date: 2007-06-22
Publication date: 2008-05-07
Anticipated expiration: 2017-06-22

Abstract

The utility model relates to an improved rolling ball silk pole. The rolling ball silk pole comprises a screw axis which is sleeved in a nut, a plurality of first rolling balls match with the screw axis and the nut. The surface of external circumference of the screw axis is provided with a thread- shaped first spiral groove; the surface of internal circumference of the nut is provided with a second spiral groove that is in correspondence to the first spiral groove. A plurality of first rolling balls are positioned in the rolling ball slide way that is formed through the first spiral groove and the second spiral groove. Two ends of the screw axis are connected with caging devices respectively. The rolling ball silk pole also comprises an adapter ring that is rotationally sleeved on the nut the adapter ring is connected with the peripheral equipment. The utility model removes the rolling ball sleeve that is positioned between the nut and the silk pole; instead, the adapter ring that can rotate without limitations is arranged on the nut. When the nut and the silk pole rotate together, the adapter ring and the nut rotate relatively, which not only greatly reduces the friction and noise but also prolongs the service life.

Description

A kind of improved ball screw

Technical field

The present invention relates to a kind of feed mechanism that is applied in the engineering machinery field, particularly a kind of improved ball screw.

Background technique

Ball screw is that spiral motion is transformed into straight line motion, obtains very big Driving force with less torque.When nut moves to the two ends of leading screw, leading screw still can rotate, and such ball screw is no limit rotation, thereby avoids accident to take place.Its work principle is, when leading screw rotated, ball was along the screw thread rotation of leading screw, and when nut moved to the two ends of leading screw, the ball cover was blocked by the pin at leading screw two ends, and at this moment ball cover and leading screw form one, rotation synchronously, thus reach no limit rotation.As the disclosed patent No. of State Patent Office be: CN03117500.7, name is called in the patent of " no stall ball screw ", it discloses a kind of no stall ball screw, constitute by back-up ring, nut, thrust-bearing, ball cover and leading screw, nut sleeve is on leading screw, ball overlaps between leading screw and nut, thrust-bearing is installed on the nut two ends, back-up ring is installed on thrust-bearing one side, the leading screw two ends have pin spacing, the nut inboard is a smooth surface, does not have the circular groove corresponding to threads of lead screw groove and ball.In this scheme, utilize and between leading screw and nut, install the ball cover additional, the ball cover socket-connects with ball, and when nut turned to the two ends of leading screw, leading screw and ball cover together rotated, and the ball cover then relative to rotating with nut, is realized the ball screw of no limit rotation.

But the problem that this scheme exists is, rotate simultaneously at leading screw and ball cover, ball overlaps when nut rotates, ball all has very big friction with respect to leading screw, nut and ball cover, noise is too big when causing the ball screw running, and serious wear, reduced the operation life of ball screw to a great extent, and surrounding environment has been impacted.Simultaneously, also be not easy to production and processing.

Summary of the invention

In order to overcome above-mentioned deficiency of the prior art, the utility model provides a kind of improved ball screw, and the ball cover cancellation with being located between leading screw and the nut directly is provided with an adapter ring on nut, realize unrestrictedly rotating.

The main technical schemes that the utility model adopts is: a kind of improved ball screw, comprise a screw axis, one is placed in the nut of described screw axis, first ball that a plurality of and described screw axis and nut match, first spiral chute that has screw thread form on the outer peripheral surface of described screw axis has on the inner peripheral surface of described nut corresponding to described first spiral fluted, second spiral chute; Described a plurality of first ball is positioned in the ball slideway of being made up of described first spiral chute and second spiral chute, and the two ends of described screw axis are connected with limit stoper respectively; Also comprise an adapter ring, described adapter ring is rotating to be placed on the described nut, and described adapter ring is connected with external equipment.

The utility model also adopts following attached technological scheme: the periphery wall of described nut is divided into first periphery wall and second periphery wall, and the diameter of described first periphery wall forms step less than the diameter of second periphery wall;

Described adapter ring is placed on described first periphery wall;

The step that described first periphery wall and described second periphery wall form, has a sidewall, on described sidewall, have first ball grooves, with have and corresponding second ball grooves of described first ball grooves on the sidewall of the corresponding adapter ring of described sidewall, in the ball slideway that forms by described first ball grooves and second ball grooves, be provided with a plurality of second balls;

Also be provided with the ball location piece in the ball slideway that is formed by described first ball grooves and second ball grooves, have the through hole that matches with described second ball on the described ball location piece, described second ball is arranged in described through hole;

On described first periphery wall, be provided with a limited ring with respect to another sidewall of described adapter ring;

The diameter of described limited ring has groove less than the diameter of described first periphery wall on described first periphery wall, and described limited ring embeds described groove;

On the sidewall of the two ends of described nut, be respectively equipped with the projection that fastens with limit stoper;

Described limit stoper is a position limit pin, has the through hole that is used to insert described position limit pin at the two ends of described screw axis;

Have the hole that is connected with external equipment on the described adapter ring.

The beneficial effect that adopts the utility model to bring: the utility model has been cancelled the ball cover of being located in the prior art between leading screw and the nut, change into an adapter ring that rotates relative to nut is set on nut, when nut turns to the two ends of screw axis, nut and screw axis together rotate, adapter ring rotates with respect to nut, when operating to ball screw, the existence of overlapping because of ball in the prior art bring noise big with regard to having overcome, the problem of serious wear.The friction of nut and screw axis inside descends significantly, and be subjected to the gravity friction to become many balls by few former ball side rubbed by gravity in the groove front of nut and adapter ring, further reduce friction, disperse gravity, reduce noise and the rate of fault of screw axis in running, the operating life that has prolonged ball screw.In addition, ball screw of the present utility model easily is convenient to produce.

Description of drawings

Fig. 1 is the three-dimensional structure diagram of prior art ball screw;

Fig. 2 is the sectional view of prior art ball screw;

Fig. 3 splits schematic representation for the utility model overall structure;

Fig. 4 is the utility model sectional view;

Fig. 5 is the sectional view of the utility model nut structure;

Fig. 6 is another embodiment's of the utility model a sectional view;

Embodiment

Below in conjunction with accompanying drawing the present invention is done further detailed description:

As Fig. 1, shown in Figure 2, be a kind of ball screw of the prior art, between nut 4 and leading screw 1, be provided with ball setting sleeve 3, on ball setting sleeve 3, have through hole, ball is arranged in through hole, when leading screw rotation running, nut 4 and ball setting sleeve 3 are done linear motion, when transporting to the two ends of leading screw 1, leading screw 1 is with 3 runnings of ball setting sleeve, and ball setting sleeve 3 rotates with respect to nut 4.But in this rotating process, ball brings very large wear damage can for the ball setting sleeve, and noise is very big, not only brings influence to surrounding environment, and what is more important has shortened the working life of ball screw.In addition, a plurality of pearl grooves on the nut inner circle wall, be equivalent to a plurality of bearings, by this principle, if adding man-hour, no matter which pearl groove bad the contact occur with leading screw, will become and have only the ball side of a pearl groove and inside thereof stressed, cause bearing the gravity inequality, damage the ball screw cisco unity malfunction easily.

Extremely shown in Figure 5 as Fig. 3, a kind of improved ball screw that provides for the utility model, comprise a screw axis 1, one is placed in the nut 2 of screw axis 1, a plurality of first balls 3 that match with screw axis 1 and nut 2, first spiral chute 11 that has screw thread form on the outer peripheral surface of screw axis 1 has second spiral chute 21 corresponding to first spiral chute 11 on the inner peripheral surface of nut 2; A plurality of first balls 3 are positioned in the ball slideway of being made up of first spiral chute 11 and second spiral chute 21, and the two ends of screw axis 1 have been respectively equipped with limit stoper.In this specific embodiment, limit stoper is a position limit pin 4, has the through hole that is used to insert position limit pin 4 at the two ends of screw axis 1.Also comprise an adapter ring 5, adapter ring 5 rotating being placed on the nut 2 have hole 51 on the periphery wall of adapter ring 5, can connect, install other external equipment.

In this specific embodiment, the periphery wall of nut 2 is provided with the diameter of the diameter of first periphery wall 22 and second periphery wall, 23, the first periphery walls 22 less than second periphery wall 23, forms step; Adapter ring 5 is placed on first periphery wall 22.

As Fig. 1, Fig. 2, shown in Figure 3, the step that first periphery wall 22 and second periphery wall 23 form, has a sidewall 24, on sidewall 24, have first ball grooves 241, and have and first ball grooves, 241 corresponding second ball grooves 52 on the sidewall of sidewall 24 corresponding adapter rings 5, in the ball slideway that forms by first ball grooves 241 and second ball grooves 52, be provided with a plurality of second balls 6.In the ball slideway that forms by first ball grooves 241 and second ball grooves 52, also be provided with ball location piece 7, have through hole 71, the second balls 6 that match with second ball 6 on the ball location piece 7 and be arranged in through hole 71.Second ball 6 is played the effect of location.On first periphery wall, be provided with a limited ring 8 with respect to another sidewall of adapter ring 5, the diameter of limited ring 8 is less than the diameter of first periphery wall 22, have groove 221 on first periphery wall 22, limited ring 8 embeds groove 221, is used for the location, and restriction adapter ring 5 does not break away from nut 2 when rotating.In addition, be respectively equipped with projection 25 on the sidewall of the two ends of nut 2, when nut 2 turned to screw axis 1 two ends, projection 25 fastened with position limit pin 4, and nut 2 and screw axis 1 are together rotated.

When rotating, when nut 2 with after locating stud contact, nut 2 rotates with

screw axis

1,5 of adapter rings rotate with respect to nut 2 under the effect of second ball 6, thereby realize unrestrictedly rotation.Ball screw of the present utility model inside is not provided with the ball cover, the ball friction reduces greatly, and bore the gravity friction by former minority ball side and become by the positive spin friction of bearing gravity in the ball grooves of adapter ring 5 and sidewall 24 of second ball 6, thereby reduced friction greatly, disperse gravity, reduce noise and the rate of fault of ball screw in running, increase the service life.

As shown in Figure 6, be another embodiment of the present utility model: ball bearing 9 is installed on the opposite side of adapter ring 5, and ball bearing 9 comprises ball 91, has on adapter ring 5 and sidewall that ball bearing 9 matches and melts the ball grooves of putting ball 91.The effect that ball bearing 9 plays is that adapter ring 5 is positioned, and is spacing, prevents that adapter ring 5 breaks away from nut 2 when nut 2 rotates.Simultaneously, when nut 2 and screw axis 1 together rotate, ball bearing 9 play spacing in, reduce as far as possible and adapter ring 5 between friction, further increase work efficiency, increase the service life.

Claims

1. improved ball screw, comprise a screw axis (1), one is placed in the nut (2) of described screw axis (1), first ball (3) that a plurality of and described screw axis (1) and nut (2) match, first spiral chute (11) that has screw thread form on the outer peripheral surface of described screw axis (1) has second spiral chute (21) corresponding to described first spiral chute (11) on the inner peripheral surface of described nut (2); Described a plurality of first balls (3) are positioned in the ball slideway of being made up of described first spiral chute (11) and second spiral chute (21), and the two ends of described screw axis (1) are respectively equipped with limit stoper; It is characterized in that: also comprise an adapter ring (5), described adapter ring (5) is rotating to be placed on the described nut (2), and described adapter ring (5) is connected with external equipment.

2. according to claim 1 described ball screw, it is characterized in that: the periphery wall of described nut (2) is provided with first periphery wall (22) and second periphery wall (23), the diameter of described first periphery wall (22) forms step less than the diameter of second periphery wall (23).

3. according to claim 2 described ball screws, it is characterized in that: described adapter ring (5) is placed on described first periphery wall (22).

4. according to claim 2 or 3 described ball screws, it is characterized in that: the step that described first periphery wall (22) and described second periphery wall (23) form, has a sidewall (24), on described sidewall (24), have first ball grooves (241), with have and corresponding second ball grooves of described first ball grooves (241) (52) on the sidewall of the corresponding adapter ring of described sidewall (24) (5), in the ball slideway that forms by described first ball grooves (241) and second ball grooves (52), be provided with a plurality of second balls (6).

5. according to claim 4 described ball screws, it is characterized in that: in the ball slideway that forms by described first ball grooves (241) and second ball grooves (52), also be provided with ball location piece (7), have the through hole (71) that matches with described second ball (6) on the described ball location piece (7), described second ball (6) is arranged in described through hole (71).

6. according to claim 5 described ball screws, it is characterized in that: on described first periphery wall (22), be provided with a limited ring (8) with respect to another sidewall of described adapter ring (5).

7. according to claim 6 described ball screws, it is characterized in that: the diameter of described limited ring (8) is less than the diameter of described first periphery wall (22), have groove (221) on described first periphery wall (22), described limited ring (8) embeds described groove (221).

8. according to claim 1 described ball screw, it is characterized in that: on the two ends sidewall of described nut (2), be respectively equipped with the projection (25) that can fasten with described limit stoper.

9. according to claim 1 described ball screw, it is characterized in that: described limit stoper is position limit pin (4), has the through hole that is used to insert described position limit pin (4) at the two ends of described screw axis (1).

10. according to claim 1 described ball screw, it is characterized in that: have the hole (51) that is connected with external equipment on the described adapter ring (5).