GB589596A - Improvements in or relating to screw-and-nut actuating mechanism particularly adapted for use in machine tool transmissions - Google Patents
Improvements in or relating to screw-and-nut actuating mechanism particularly adapted for use in machine tool transmissionsInfo
- Publication number
- GB589596A GB589596A GB712243A GB712243A GB589596A GB 589596 A GB589596 A GB 589596A GB 712243 A GB712243 A GB 712243A GB 712243 A GB712243 A GB 712243A GB 589596 A GB589596 A GB 589596A
- Authority
- GB
- United Kingdom
- Prior art keywords
- nut
- screw
- pressure
- clearance
- thread
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/12—Arrangements for cooling or lubricating parts of the machine
- B23Q11/121—Arrangements for cooling or lubricating parts of the machine with lubricating effect for reducing friction
- B23Q11/125—Arrangements for cooling or lubricating parts of the machine with lubricating effect for reducing friction for lubricating ball screw systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
- B23Q5/54—Arrangements or details not restricted to group B23Q5/02 or group B23Q5/22 respectively, e.g. control handles
- B23Q5/56—Preventing backlash
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
589,596. Screw-and-nut gearing. STEVENS, A. H. (Cincinnati Milling Machine Co.). May 5, 1943, No. 7122. [Class 80 (iii)] To reduce friction in precision screw-and-nut mechanism, for a milling or other machine tool, a nut 16, Fig. 2 (and/or screw), has one or more closed-ended helical grooves 23, 24 on each of its opposed helical faces, which are supplied with oil under pressure through independent ducts 34, 35, 29 and 33, 36, 31 respectively, which oil passes out through the clearance space between the opposed working faces of the screw 11 and nut 16, through wide clearances 39, 40 at the crests and cores of the threads to escape at the ends of the nut to a supply reservoir from which it is pumped at constant flow-rate to each supply duct. A pressure-gradient, determined by the hydraulic flow-resistance, exists in the working clearancespace and this, together with the pressure in the appropriate groove, supports the axial load on the screw. Variations in load cause variation in clearance, which in turn varies the flow-resistance and thus the pressure in the grooves, increase in pressure at one face being accompanied by reduction at the opposite face, so that, under load, the screw-thread automatically takes up an intermediate position in the working clearance in which the opposing pressure and the load balance, with the screw-thread out of metallic contact with the faces of the nut-thread. Initial adjustment of axial clearance is preferably provided by making the nut in two relatively rotatable halves with the split in a radial plane, the halves being axially spaced either by a replaceable ground shim, Fig. 4 (not shown), or, as shown in Fig. 1, the nut-halves 45, 46 are driven through a helical gear-pair 61, 62 with gears of opposite' helixangle so that axial adjustment of the gear-pair, by screwed end-collars 73, turns the nut-halves 45, 46 relatively to each other. In this case there are oil-supply grooves only in the one helical working-face of each nut-half, feed being through annular spaces 94, 95 and ducts 90, 91 respectively, and return from the ends of the nut-halves being through ducts 39<1>, 40<1>, 41<1>. The independent supply of pressure-oil to the grooves 23, 24 in the opposed helical faces of the nut may be by two separate pumps or, as shown in Fig. 1, a pressure-conduit 78, leading from a single pump, feeds the groovesupply ducts 90, 91 through an automatic flowproportioning device comprising a pressureresponsive drift-block 86, which, by moving towards or away from the entries of orifices 88, 89, leading to the thread-supply ducts 90, 91, under changes in pressure in the ducts, is capable of increasing or reducing the flow-resistance in the supply to one duct and simultaneously reducing or increasing the resistance to the other duct. In operation, an increase in axial load on the screw 11 will cause reduction in the clearance on the loaded thread-face and increase in clearance on the opposite thread-face. The consequent pressure rise in that duct 90, 91, leading to the thread-clearance of greater resistance, causes the block 86 to move away from the orifice 88, 89 of that duct, thus reducing its orifice flow-resistance and simultaneously increasing that of the other duct, so that the overall flow-resistance of the path through the clearance at each of the thread-faces, and thus the rate of flow through each path, are kept constant. The part 10 traversed by the screw is a support for a cutting or other tool in which the screw 11 is non-rotatably mounted and the screw is prevented from sagging by end supports 19.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US405354A US2320353A (en) | 1941-08-04 | 1941-08-04 | Power transmission mechanism |
GB712243A GB589596A (en) | 1943-05-05 | 1943-05-05 | Improvements in or relating to screw-and-nut actuating mechanism particularly adapted for use in machine tool transmissions |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB712243A GB589596A (en) | 1943-05-05 | 1943-05-05 | Improvements in or relating to screw-and-nut actuating mechanism particularly adapted for use in machine tool transmissions |
Publications (1)
Publication Number | Publication Date |
---|---|
GB589596A true GB589596A (en) | 1947-06-25 |
Family
ID=9827035
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB712243A Expired GB589596A (en) | 1941-08-04 | 1943-05-05 | Improvements in or relating to screw-and-nut actuating mechanism particularly adapted for use in machine tool transmissions |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB589596A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2952190A (en) * | 1956-07-05 | 1960-09-13 | Kearney & Trecker Corp | Backlash eliminator |
GB2128711A (en) * | 1982-10-14 | 1984-05-02 | Lucas Ind Plc | Adjustment device |
WO2007031603A1 (en) * | 2005-09-14 | 2007-03-22 | Mandrel Oy | Arrangement in cutting tool |
CN103072037A (en) * | 2012-11-22 | 2013-05-01 | 长春设备工艺研究所 | Closed type sliding following oil receiving device applied to oil return of hydrostatic guideway |
CN108223737A (en) * | 2016-12-12 | 2018-06-29 | 斯凯孚公司 | Actuator |
CN114087270A (en) * | 2021-11-09 | 2022-02-25 | 天津金键航天设备有限公司 | Internal thread part |
-
1943
- 1943-05-05 GB GB712243A patent/GB589596A/en not_active Expired
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2952190A (en) * | 1956-07-05 | 1960-09-13 | Kearney & Trecker Corp | Backlash eliminator |
GB2128711A (en) * | 1982-10-14 | 1984-05-02 | Lucas Ind Plc | Adjustment device |
WO2007031603A1 (en) * | 2005-09-14 | 2007-03-22 | Mandrel Oy | Arrangement in cutting tool |
CN103072037A (en) * | 2012-11-22 | 2013-05-01 | 长春设备工艺研究所 | Closed type sliding following oil receiving device applied to oil return of hydrostatic guideway |
CN103072037B (en) * | 2012-11-22 | 2015-03-18 | 长春设备工艺研究所 | Closed type sliding following oil receiving device applied to oil return of hydrostatic guideway |
CN108223737A (en) * | 2016-12-12 | 2018-06-29 | 斯凯孚公司 | Actuator |
CN108223737B (en) * | 2016-12-12 | 2024-02-13 | 伊维莱有限公司 | Actuator with a spring |
CN114087270A (en) * | 2021-11-09 | 2022-02-25 | 天津金键航天设备有限公司 | Internal thread part |
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