CN205278273U

CN205278273U - External circulating ball screw

Info

Publication number: CN205278273U
Application number: CN201521011201.8U
Authority: CN
Inventors: 杨家铭
Original assignee: Hiwin Technologies Corp
Current assignee: Hiwin Technologies Corp
Priority date: 2015-12-08
Filing date: 2015-12-08
Publication date: 2016-06-01
Anticipated expiration: 2025-12-08

Abstract

The utility model provides an external circulating ball screw, include a screw shaft, a nut, an and reflux unit, the screw shaft has an external screw thread groove, but nut displacement ground cover is located the screw shaft and is had an internal thread groove, the internal thread groove forms a load passageway corresponding to the external screw thread groove of screw shaft and between the external screw thread groove of screw shaft, the reflux unit has two guide pieces and an apron, each guide piece is located the nut and is had a first counter -flow vat and one border on in the first face of accepting of first counter -flow vat, the apron is located the nut and is had a second counter -flow vat and two convex parts, each convex part has an extension guide channel and the face is accepted to a second, the both ends of extending the guide channel link up first respectively, the second counter -flow vat, first the accept face of a butt in the guide piece is accepted to the second, structure arrangement like this can reach and promote the effect that actuates smooth and easy degree.

Description

External circulation type ball bolt

Technical field

The utility model is relevant with ball screw rod, espespecially a kind of external circulation type ball bolt promoting start smooth degree.

Background technology

In previously, applicant was applied for that TaiWan, China was announced M485984 patent case and provided a kind of circulation accessory, circulation accessory has an Abdeckteil and two guide members, Abdeckteil has a backflow road and two locating slots, each guide member has a location division and a guiding portion, guide member is installed on the locating slot of Abdeckteil by location division, and guide member is installed in an installation groove of nut by guiding portion so that rolling part enters in the backflow road of Abdeckteil by the guiding in the guiding portion of guide member.

But find after actually operating, the joining place section of there will be difference between the guiding portion of guide member and the backflow road of Abdeckteil, this section of missionary society produces vibrations and noise because of the continuous shock of rolling part, so on the start smooth degree of ball screw rod and will certainly cause impact to a certain degree work-ing life. Therefore, aforementioned existing patent case structurally has necessity of improvement.

Practical novel content

Main purpose of the present utility model is to provide a kind of external circulation type ball bolt, and it can promote start smooth degree and extend work-ing life.

In order to reach above-mentioned purpose, external circulation type ball bolt of the present utility model includes a screw shaft, a nut, and a backflow unit. this screw shaft has an outside screw groove, this nut can being sheathed on this screw shaft and having an internal thread groove along this screw shaft axially, this internal thread groove is corresponding to the outside screw groove of this screw shaft, make to be formed between the internal thread groove of this nut and the outside screw groove of this screw shaft a load channel, in addition, this nut has one first against plane, this first open holes respectively against the two ends of plane with this internal thread groove of a connection, this backflow unit has two guide members and a cover plate, respectively this guide member has a guiding portion, this guiding portion is embedded in the open holes of this nut and first backflash and with this load channel of linking is adjacent to the first continuing surface of this first backflash, this cover plate has one the 2nd against plane, 2nd is connected to the first of this nut against plane against plane and has one the 2nd backflash and two protuberances, respectively this protuberance is embedded in the open holes of this nut and has extension guiding groove and one the 2nd continuing surface, this extension guiding groove two ends be connected respectively this first, 2nd backflash, 2nd continuing surface is connected to the first continuing surface of this guide member.

Wherein the first of this nut has, against the two ends of plane, the screw that is adjacent to this open holes respectively, the pilot hole of this location division is run through in the location division and that respectively this guide member has more this guiding portion of a connection, respectively this guide member is fixed on this nut by a screw, this screw is arranged in the pilot hole of this guide member and is fixed in the screw of this nut, the 2nd of this cover plate has a locating slot respectively against the two ends of plane, and this locating slot is sheathed on the location division of this guide member.

From the above, external circulation type ball bolt of the present utility model utilizes the extending design of the protuberance of this cover plate, can effectively improve the section difference problem produced in the middle of prior art, allow ball not have the problem impacting point in turnover process, and then reach the object promoting start smooth degree and extending work-ing life.

Accompanying drawing explanation

For technology contents of the present utility model is described further, it is described in detail as follows below in conjunction with embodiment and accompanying drawing, wherein:

Fig. 1 is stereographic map of the present utility model.

Fig. 2 is three-dimensional exploded view of the present utility model.

Fig. 3 is partial perspective view of the present utility model, the structural relation between main display guide member and cover plate.

Fig. 4 is radial cross-section of the present utility model.

Fig. 5 is axial sectional view of the present utility model.

Embodiment

Referring to Fig. 1 and Fig. 2, external circulation type ball bolt 10 of the present utility model includes screw shaft 20, nut 30, backflow unit 40, and multiple ball 70.

The periphery of screw shaft 20 has an outside screw groove 22.

Nut 30 is sheathed on screw shaft 20 and has an internal thread groove 31, internal thread groove 31 corresponding to screw shaft 20 outside screw groove 22 and and form a load channel 12 (as shown in Figure 5) between the outside screw groove 22 of screw shaft 20. In addition, nut 30 has one first against plane 32, and the first open holes 33 and respectively against the two ends of plane 32 with a connection internal thread groove 31 is adjacent to the screw 34 of open holes 33.

Backflow unit 40 has two guide members 50, each guide member 50 has guiding portion 51 and a location division 52, guiding portion 51 is embedded in the open holes 33 of nut 30 and first backflash 53 and with a linking load channel 12 is adjacent to the first continuing surface 54 of the first backflash 53, one end of location division 52 connects guiding portion 51, the other end of location division 52 has a pilot hole 55, each guide member 50 is fixed on nut 30 by a screw 56, and screw 56 is arranged in the pilot hole 55 of guide member 50 and is fixed in the screw 34 of nut 30. in addition, as shown in Figures 3 to 5, backflow unit 40 has more a cover plate 60, cover plate 60 has one the 2nd against plane 61, 2nd is connected to the first of nut 30 against plane 61 against plane 32 and has one the 2nd backflash 62, two protuberance 63 and two locating slots 64, each protuberance 63 is embedded in the open holes 33 of nut 30 and has extension guiding groove 65 and one the 2nd continuing surface 66, the two ends extending guiding groove 65 are connected first respectively, 2nd backflash 53, 62, 2nd continuing surface 66 is connected to the first continuing surface 54 of guide member 50, locating slot 64 is adjacent to protuberance 63 and the location division 52 of socket guide member 50, cover plate 60 make together with can be assembled in guide member 50.

Each ball 70 is located in load channel 12 and is produced circulation via first, second backflash 53,62 and runs.

From the above, external circulation type ball bolt 10 of the present utility model utilizes the protuberance 63 of cover plate 60 to extend into open holes 33, the 2nd continuing surface 66 is allowed to be connected to the first continuing surface 54 of guide member 50, also guiding groove 65 is allowed to be connected the first backflash 53, thus, ball 70 enter the first backflash from load channel 12 after 53 can contact protuberance 63 fast and be subject to guide groove 65 guiding. The utility model is allowed to improve in prior art poor in the section being connected place generation, also allow ball 70 can operate in load channel 12, nut 30 and backflow unit 40 when changing direction smooth and easyly, reduce ball 70 because the vibrations that cause of section difference and noise, and then promote start smooth degree and also extend work-ing life.

Claims

1. an external circulation type ball bolt, it is characterised in that, include:

One screw shaft, has an outside screw groove;

One nut, can being sheathed on this screw shaft axially and there is an internal thread groove along this screw shaft, this internal thread groove is corresponding to the outside screw groove of this screw shaft, make to be formed between the internal thread groove of this nut and the outside screw groove of this screw shaft a load channel, this nut has one first against plane, this first open holes respectively against the two ends of plane with this internal thread groove of a connection; And

One backflow unit, there is two guide members and a cover plate, respectively this guide member has a guiding portion, this guiding portion is embedded in the open holes of this nut and first backflash and with this load channel of linking is adjacent to the first continuing surface of this first backflash, this cover plate has one the 2nd against plane, 2nd is connected to the first of this nut against plane against plane and has one the 2nd backflash and two protuberances, respectively this protuberance is embedded in the open holes of this nut and has extension guiding groove and one the 2nd continuing surface, this extension guiding groove two ends be connected respectively this first, 2nd backflash, 2nd continuing surface is connected to the first continuing surface of this guide member.

2. external circulation type ball bolt as claimed in claim 1, it is characterized in that, wherein the first of this nut has, against the two ends of plane, the screw that is adjacent to this open holes respectively, the pilot hole of this location division is run through in the location division and that respectively this guide member has more this guiding portion of a connection, respectively this guide member is fixed on this nut by a screw, this screw is arranged in the pilot hole of this guide member and is fixed in the screw of this nut, the 2nd of this cover plate has a locating slot respectively against the two ends of plane, and this locating slot is sheathed on the location division of this guide member.