WO2023202086A1 - 一种高速螺母旋转进给丝杠装置 - Google Patents

一种高速螺母旋转进给丝杠装置 Download PDF

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Publication number
WO2023202086A1
WO2023202086A1 PCT/CN2022/136817 CN2022136817W WO2023202086A1 WO 2023202086 A1 WO2023202086 A1 WO 2023202086A1 CN 2022136817 W CN2022136817 W CN 2022136817W WO 2023202086 A1 WO2023202086 A1 WO 2023202086A1
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WIPO (PCT)
Prior art keywords
bearing
screw
nut
fixing sleeve
pulley
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.)
Ceased
Application number
PCT/CN2022/136817
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English (en)
French (fr)
Inventor
陈玉峰
侯颜博
杜长林
任志辉
宋明山
蔡春刚
范春宏
郭翠娟
王连炀
李亚鹏
贺行健
宫兴林
鲍文禄
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dalian Kede Numerical Control Co Ltd
Original Assignee
Dalian Kede Numerical Control Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dalian Kede Numerical Control Co Ltd filed Critical Dalian Kede Numerical Control Co Ltd
Priority to JP2024556557A priority Critical patent/JP7818718B2/ja
Priority to EP22938304.7A priority patent/EP4512576A4/en
Priority to KR1020247032365A priority patent/KR20240158928A/ko
Priority to US18/857,857 priority patent/US20250114891A1/en
Publication of WO2023202086A1 publication Critical patent/WO2023202086A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • B23Q5/22—Feeding members carrying tools or work
    • B23Q5/34—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission
    • B23Q5/38—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission feeding continuously
    • B23Q5/40—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission feeding continuously by feed shaft, e.g. lead screw
    • B23Q5/402—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission feeding continuously by feed shaft, e.g. lead screw in which screw or nut can both be driven
    • 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
    • B23Q5/22—Feeding members carrying tools or work
    • B23Q5/34—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission
    • B23Q5/38—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission feeding continuously
    • B23Q5/40—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission feeding continuously by feed shaft, e.g. lead screw
    • 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
    • B23Q5/22—Feeding members carrying tools or work
    • B23Q5/34—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission
    • B23Q5/38—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission feeding continuously
    • B23Q5/40—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission feeding continuously by feed shaft, e.g. lead screw
    • B23Q5/404—Screw bearings therefor
    • 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
    • B23Q5/22—Feeding members carrying tools or work
    • B23Q5/34—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission
    • B23Q5/38—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission feeding continuously
    • B23Q5/40—Feeding other members supporting tools or work, e.g. saddles, tool-slides, through mechanical transmission feeding continuously by feed shaft, e.g. lead screw
    • B23Q5/408—Nut bearings therefor
    • 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
    • F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
    • F16H25/2204—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls
    • 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
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/048—Type of gearings to be lubricated, cooled or heated
    • F16H57/0497—Screw mechanisms
    • 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
    • F16H2025/2062—Arrangements for driving the actuator
    • F16H2025/2096—Arrangements for driving the actuator using endless flexible members

Definitions

  • the invention relates to the technical field of CNC machine tool feed drive, and in particular to a high-speed nut rotating feed screw device.
  • the screw drive device is a frequently used design structure, especially for the feed movement of the machine tool's slide table or spindle.
  • the existing screw drive device generally uses a drive motor to connect to the screw, and the drive motor drives The screw rotates, and the screw nut is fixedly connected to the moving part. Under the rotation of the screw, the screw nut is driven to move in a straight line to drive the moving part.
  • the existing screw driving device has the following shortcomings: due to the The volume and mass are large, so the inertia is also large. When driving the screw to rotate, a larger power drive motor is required, which increases the volume and cost of the overall drive device.
  • the existing screw drive requires The bearing unit is sleeved outside the screw nut, which causes the radial size of the screw nut assembly to increase, thereby increasing the overall volume of the screw drive device.
  • the bearing unit is sleeved outside the screw nut, the screw nut and the screw The heat generated between the rods is not easy to dissipate, affecting the performance and service life of the screw nut.
  • the present invention proposes a high-speed nut rotating feed screw device.
  • a high-speed nut rotating feed screw device including a screw, a screw nut, a bearing unit and a drive unit;
  • the screw is fixed on the machine tool through a screw seat
  • the bearing unit includes a bearing inner fixing sleeve, a bearing outer fixing sleeve and a bearing assembly.
  • the bearing outer fixing sleeve is sleeved on the bearing inner fixing sleeve.
  • the bearing outer fixing sleeve is connected to the bearing inner fixing sleeve.
  • a bearing installation space is formed between the fixed sleeves, and the bearing assembly is installed in the bearing installation space.
  • One end of the fixed sleeve in the bearing is a screw nut connecting end for fixed connection with one end of the screw nut, and the other end It is the drive unit connection end used for fixed connection with the drive unit;
  • the screw nut is arranged on the screw and one end is fixedly connected to the screw nut connection end of the fixed sleeve in the bearing;
  • the drive unit includes a first pulley, a second pulley, a synchronous belt and a drive motor.
  • the first pulley is connected to the drive motor, and the second pulley is sleeved on the screw and connected to the screw.
  • the connecting end of the drive unit of the fixed sleeve in the bearing is fixedly connected, and the first pulley and the second pulley are connected through a synchronous belt.
  • a bearing sealing ring is provided at one end between the bearing inner fixed sleeve and the bearing outer fixed sleeve close to the screw nut connection end.
  • outer fixed sleeve of the bearing is also provided with an oil filling channel connected with the bearing seal ring.
  • a torque limiter is provided between the drive motor and the first pulley.
  • the bearing assembly includes two groups of symmetrically arranged angular contact ball bearings, each group of angular contact ball bearings including at least one angular contact ball bearing.
  • the inner fixed sleeve of the bearing has a stepped shaft sleeve structure.
  • One end of the inner fixed sleeve of the bearing close to the connection end of the drive unit is provided with external threads.
  • the bearing assembly is fixed in the bearing through a locking nut. on the sleeve.
  • a gland which is fixedly connected to the sliding table and one end of the bearing outer fixed sleeve close to the connection end of the drive unit through screws.
  • the screw is also provided with a cooling channel arranged along the axial direction of the screw.
  • the high-speed nut rotating feed screw device disclosed in the present invention has the following beneficial effects:
  • the screw device disclosed in the present invention directly drives the screw nut to rotate through the drive unit, thereby driving the slide table to move through the screw nut.
  • Due to the small size, light weight and small inertia of the screw nut it can be driven by a low-power driving motor, reducing the size and cost of the device; at the same time, due to the small motion inertia of the entire device, the screw nut can be driven High-speed rotational feeding of the screw nut; further, since the screw nut and the bearing unit are arranged along the axial direction of the screw, the overall outer diameter of the screw nut and the bearing unit is reduced, thereby reducing the size of the screw device. , at the same time, because the screw nut and the bearing unit are arranged along the axial direction of the screw, it facilitates heat dissipation and improves the performance and service life of the screw.
  • Figure 1 is a structural diagram of a high-speed nut rotating feed screw device disclosed in the present invention
  • Figure 2 is a partially enlarged schematic diagram of the dotted box in Figure 1;
  • the high-speed nut rotating feed screw device disclosed by the present invention includes a screw 1, a screw nut 2, a bearing unit 3 and a drive unit 4;
  • Both ends of the screw 1 are fixed on the machine tool through screw seats 10;
  • the bearing unit 3 includes a bearing inner fixing sleeve 30, a bearing outer fixing sleeve 31 and a bearing assembly 32.
  • the bearing outer fixing sleeve 31 is sleeved on the bearing inner fixing sleeve 30.
  • the bearing outer fixing sleeve A bearing installation space 33 is formed between the barrel 31 and the bearing inner fixed sleeve 30.
  • the bearing assembly 32 is installed in the bearing installation space 33.
  • One end of the bearing inner fixed sleeve 30 is used to connect with the screw nut. 2
  • One end is a screw nut connection end 34 that is fixedly connected, and the other end is a drive unit connection end 35 that is used to be fixedly connected with the drive unit 4;
  • the screw nut 2 is arranged on the screw 1 and one end is fixedly connected to the screw nut connection end 34 of the bearing inner fixed sleeve 30.
  • the screw and the screw nut adopt a standard screw structure. To facilitate procurement and thereby reduce the design and manufacturing costs of machine tools;
  • the drive unit 4 includes a first pulley 40, a second pulley 41, a synchronous belt 42 and a drive motor 43.
  • the first pulley 40 is connected to the drive motor 43, and the second pulley 41 is sleeved on
  • the screw 1 is fixedly connected to the drive unit connecting end 35 of the bearing inner fixed sleeve 30.
  • the first pulley 40 and the second pulley 41 are connected through a synchronous belt 42.
  • the drive motor uses a servo motor.
  • the bearing inner fixed sleeve 30 is a stepped shaft sleeve structure, and the bearing inner fixed sleeve 30 is connected close to the driving unit.
  • One end of the end 35 is provided with an external thread, and the bearing assembly 32 is fixed on the inner fixed sleeve 30 of the bearing through a locking nut 39, that is, the locking nut abuts against the inner ring of the bearing to limit the bearing within the bearing.
  • Fixed sleeve, one end of the bearing inner fixed sleeve 30 facing the screw nut 2 is provided with a bearing inner fixed sleeve connecting flange 300, the screw nut connecting method 20 and the bearing inner fixed sleeve connecting flange 300 are connected by screws
  • Fixed connection, the end provided with the lock nut is also provided with a gland 38.
  • the gland 38 is fixedly connected to the slide table and the end of the bearing outer fixing sleeve 31 close to the connection end of the drive unit through screws.
  • the gland is connected to the outer surface of the bearing.
  • One end of the ring abuts to limit the inner ring of the bearing in the outer fixed sleeve of the bearing.
  • the second pulley 41 has a through hole in the middle. The second pulley 41 is sleeved on the screw through the through hole and is connected to the inner fixed sleeve of the bearing through screws. Barrel fixed connection.
  • the screw device disclosed in the present invention directly drives the screw nut to rotate through the drive unit, thereby driving the slide table to move through the screw nut. Since the screw nut is small in size, light in weight and has low inertia, it can use a low-power drive.
  • the motor is driven, which reduces the size and cost of the device; at the same time, because the motion inertia of the entire device is small, high-speed rotational feeding of the screw nut can be achieved; further, because the screw nut and the bearing unit move along the axial direction of the screw nut, The arrangement reduces the overall outer diameter of the screw nut and the bearing unit.
  • bearings with smaller diameters can be used, which further reduces the moment of inertia, thereby reducing the size of the screw device.
  • the screw nut and the The bearing unit is arranged along the axial direction of the screw, so that the screw nut is completely exposed, which facilitates the heat dissipation of the screw nut and improves the performance and service life of the screw.
  • the screw nut is connected through the bearing unit, both ends of the screw Therefore, the screw is equivalent to having three support points.
  • the driving force exerted by the drive unit is close to the screw nut, thereby improving the rigidity of the screw, allowing the screw nut to rotate at high speed.
  • the gap between the screw and the screw nut The safe speed is greatly increased, further improving the machine tool's motion performance.
  • a bearing sealing ring 36 is provided at one end between the bearing inner fixing sleeve 30 and the bearing outer fixing sleeve 31 close to the screw nut connection end 34, and the bearing outer fixing sleeve 31 is also provided with a bearing sealing ring 36.
  • the oil filling channel 37 connected with the bearing seal ring 36 due to the bearing seal ring structure and the oil filling channel, can realize the sealing of the bearing assembly, ensure the performance of the bearing, and thereby ensure the performance of the entire screw device and improve its use. life.
  • a torque limiter 44 is provided between the drive motor 43 and the first pulley 40. Since the torque limiter is provided, when the machine tool is overloaded due to impact or other reasons, the torque limiter slips and protects the machine. The drive unit will not be damaged.
  • the bearing assembly 32 includes two groups of symmetrically arranged angular contact ball bearings.
  • Each group of angular contact ball bearings includes at least one angular contact ball bearing.
  • each group has two angular contact ball bearings, two of which are symmetrically arranged.
  • the sets of angular contact ball bearings are separated by spacers. Only the angular contact ball bearings can withstand the axial force generated between the screw and the screw nut and the radial force generated by the drive motor through the synchronous belt, ensuring The performance between the screw nut and the screw increases the service life. It is preferred to use an angular contact ball bearing with a pressure angle of 60 degrees.
  • the screw 1 is also provided with a cooling channel 11 arranged along the axial direction of the screw.
  • a cooling channel is processed in the center of the screw along the axial direction and runs through both ends of the screw.
  • the arrow in the picture is the flow direction of the coolant, which can further cool down the screw and screw nut to ensure the performance and service life of the screw and screw nut.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transmission Devices (AREA)

Abstract

本发明公开了一种高速螺母旋转进给丝杠装置，包括丝杠、丝杠螺母、轴承单元以及驱动单元；丝杠通过丝杠座固定在机床上；轴承单元包括轴承内固定套筒、轴承外固定套筒以及安装在其间的轴承组件，轴承内固定套筒一端与丝杠螺母一端固定连接，另一端与驱动单元固定连接；丝杠螺母设置在丝杠，驱动单元包括第一带轮、第二带轮、同步带以及驱动电机，第一带轮与驱动电机连接，第二带轮套在丝杠上且与轴承内固定套筒连接，第一带轮与第二带轮之间通过同步带连接。本发明公开的高速螺母旋转进给丝杠装置具有结构简单，体积小，便于散热以及运行速度高等优点。

Description

一种高速螺母旋转进给丝杠装置 技术领域
本发明涉及数控机床进给驱动技术领域，尤其是一种高速螺母旋转进给丝杠装置。
背景技术
在数控机床领域，丝杠驱动装置是经常采用的设计结构，尤其是机床的滑台或主轴的进给运动，然而，现有的丝杠驱动装置一般采用驱动电机与丝杠连接，驱动电机驱动丝杠转动，丝杠螺母与移动部件固定连接，在丝杠的转动下，驱动丝杠螺母沿直线运动进而实现对移动部件的驱动，现有的丝杠驱动装置具有以下不足：由于丝杠的体积和质量较大，因此，其惯量也大，在驱动丝杠转动时，需要功率较大的驱动电机，进而增加了整体驱动装置的体积和成本；同时，现有的丝杠驱动装置需要将轴承单元套在丝杠螺母外，造成丝杠螺母组件的径向尺寸增大，进而增大了丝杠驱动装置的整体体积，同时，由于轴承单元套在丝杠螺母外，丝杠螺母与丝杠之间产生的热量不易散出，影响了丝杠螺母的性能和使用寿命。
发明内容
本发明针对以上问题提出了一种高速螺母旋转进给丝杠装置。
本发明采用的技术手段如下：
一种高速螺母旋转进给丝杠装置，包括丝杠、丝杠螺母、轴承单元以及驱动单元；
所述丝杠通过丝杠座固定在机床上；
所述轴承单元包括轴承内固定套筒、轴承外固定套筒以及轴承组件，所述轴承外固定套筒套在所述轴承内固定套筒上，所述轴承外固定套筒与所述轴承内固定套筒之间形成轴承安装空间，所述轴承组件安装在所述轴承安装空间内，所述轴承内固定套筒一端为用于与丝杠螺母一端固定连接的丝杠螺母连接端，另一端为用于与驱动单元固定连接的驱动单元连接端；
所述丝杠螺母设置在所述丝杠上且一端与所述轴承内固定套筒 的丝杠螺母连接端固定连接；
所述驱动单元包括第一带轮、第二带轮、同步带以及驱动电机，所述第一带轮与所述驱动电机连接，所述第二带轮套在所述丝杠上且与所述轴承内固定套筒的驱动单元连接端固定连接，所述第一带轮与所述第二带轮之间通过同步带连接。
进一步地，所述轴承内固定套筒与所述轴承外固定套筒之间靠近丝杠螺母连接端的一端设有轴承密封圈。
进一步地，所述轴承外固定套筒上还设有与所述轴承密封圈连通的注油通道。
进一步地，所述驱动电机与所述第一带轮之间还设有力矩限制器。
进一步地，所述轴承组件包括两组对称设置的角接触球轴承，每组角接触球轴承包括至少一个角接触球轴承。
进一步地，所述轴承内固定套筒为阶梯轴套筒结构，所述轴承内固定套筒靠近驱动单元连接端的一端设有外螺纹，所述轴承组件通过锁紧螺母固定在所述轴承内固定套筒上。
进一步地，还包括压盖，所述压盖通过螺钉分别与滑台和轴承外固定套筒靠近驱动单元连接端的一端固定连接。
进一步地，所述丝杠中还设有沿丝杠轴向设置的冷却通道。
与现有技术比较，本发明公开的高速螺母旋转进给丝杠装置具有以下有益效果：本发明公开的丝杠装置由于通过驱动单元直接驱动丝杠螺母转动，从而通过丝杠螺母带动滑台运动，由于丝杠螺母体积较小、重量轻以及惯量小，因此，可以采用小功率的驱动电机进行驱动，减小了装置的体积和成本；同时，由于由于整个装置的运动惯量小，可以实现丝杠螺母的高速旋转进给；进一步地，由于丝杠螺母与轴承单元沿丝杠轴向方向布置，减小了丝杠螺母与轴承单元的整体外径大小，进而使得丝杠装置的体积减小，同时，由于丝杠螺母与轴承单元沿丝杠轴向方向布置，便于进行散热，提升了丝杠的性能和使用寿命。
附图说明
图1为本发明公开的高速螺母旋转进给丝杠装置的结构图；
图2为图1中虚线框的局部放大示意图；
图中：1、丝杠，10、丝杠座，11、冷却通道，2、丝杠螺母，20、丝杠螺母连接法兰，3、轴承单元，30、轴承内固定套筒，300、轴承内固定套筒连接法兰，31、轴承外固定套筒，32、轴承组件，33、轴承安装空间，34、丝杠螺母连接端，35、驱动单元连接端，36、轴承密封圈，37、注油通道，38、压盖，39、锁紧螺母，4、驱动单元，40、第一带轮，41、第二带轮，42、同步带，43、驱动电机，44、力矩限制器。
具体实施方式
如图1和图2所示为本发明公开的高速螺母旋转进给丝杠装置，包括丝杠1、丝杠螺母2、轴承单元3以及驱动单元4；
所述丝杠1两端通过丝杠座10固定在机床上；
所述轴承单元3包括轴承内固定套筒30、轴承外固定套筒31以及轴承组件32，所述轴承外固定套筒31套在所述轴承内固定套筒30上，所述轴承外固定套筒31与所述轴承内固定套筒30之间形成轴承安装空间33，所述轴承组件32安装在所述轴承安装空间33内，所述轴承内固定套筒30一端为用于与丝杠螺母2一端固定连接的丝杠螺母连接端34，另一端为用于与驱动单元4固定连接的驱动单元连接端35；
所述丝杠螺母2设置在所述丝杠1上且一端与所述轴承内固定套筒30的丝杠螺母连接端34固定连接，优选地，丝杠和丝杠螺母选用标准丝杠结构，以便于进行采购，进而降低机床的设计和制造成本；
所述驱动单元4包括第一带轮40、第二带轮41、同步带42以及驱动电机43，所述第一带轮40与所述驱动电机43连接，所述第二带轮41套在所述丝杠1上且与所述轴承内固定套筒30的驱动单元连接端35固定连接，所述第一带轮40与所述第二带轮41之间通过同步带42连接，本实施例中，驱动电机采用伺服电机。
具体地，丝杠螺母2朝向轴承单元3的一端设有丝杠螺母连接法 连20，所述轴承内固定套筒30为阶梯轴套筒结构，所述轴承内固定套筒30靠近驱动单元连接端35的一端设有外螺纹，所述轴承组件32通过锁紧螺母39固定在所述轴承内固定套筒30上，即通过锁紧螺母与轴承的内圈抵接以将轴承限定在轴承内固定套筒，轴承内固定套筒30朝向丝杠螺母2的一端设有轴承内固定套筒连接法兰300，丝杠螺母连接法连20与轴承内固定套筒连接法兰300之间通过螺钉固定连接，设有锁紧螺母的一端还设有压盖38，所述压盖38通过螺钉分别与滑台和轴承外固定套筒31靠近驱动单元连接端的一端固定连接，压盖与轴承的外圈一端抵接以用于将轴承内圈限定在轴承外固定套筒中，第二带轮41中间具有通孔，第二带轮通过通孔套在丝杠上并通过螺钉与轴承内固定套筒固定连接。
本发明公开的丝杠装置由于通过驱动单元直接驱动丝杠螺母转动，从而通过丝杠螺母带动滑台运动，由于丝杠螺母体积较小、重量轻以及惯量小，因此，可以采用小功率的驱动电机进行驱动，减小了装置的体积和成本；同时，由于整个装置的运动惯量小，可以实现丝杠螺母的高速旋转进给；进一步地，由于丝杠螺母与轴承单元沿丝杠轴向方向布置，减小了丝杠螺母与轴承单元的整体外径大小，尤其是可以采用直径较小的轴承，进一步降低了转动惯量，进而使得丝杠装置的体积减小，同时，由于丝杠螺母与轴承单元沿丝杠轴向方向布置，使得丝杠螺母完全裸露，便于丝杠螺母进行散热，提升了丝杠的性能和使用寿命，进一步地，由于丝杠螺母通过轴承单元连接，丝杠两端固定，因此，丝杠相当于有三个支撑点，驱动单元施加的驱动力与丝杠螺母靠近，进而提高了丝杠的刚性，使得丝杠螺母可以高速旋转，丝杠与丝杠螺母之间的安全转速大幅度提高，进一步提高了机床运动性能。
进一步地，所述轴承内固定套筒30与所述轴承外固定套筒31之间靠近丝杠螺母连接端34的一端设有轴承密封圈36，所述轴承外固定套筒31上还设有与所述轴承密封圈36连通的注油通道37，由于设置有轴承密封圈结构，以及注油通道，可以实现对轴承组件的密封，保证轴承的性能，进而保证整个丝杠装置的性能，提高其使用寿命。
进一步地，所述驱动电机43与所述第一带轮40之间还设有力矩限制器44，由于设置有力矩限制器，使得由于机床撞击或其他原因造成超载时，力矩限制器打滑，保护了驱动单元不会受到损坏。
进一步地，所述轴承组件32包括两组对称设置的角接触球轴承，每组角接触球轴承包括至少一个角接触球轴承，在本实施例中，每组具有两个角接触球轴承，两组角接触球轴承之间通过隔圈分隔，才用角接触球轴承即可以承受丝杠与丝杠螺母之间产生的轴向力又可以承受驱动电机通过同步带产生的径向力，保证了丝杠螺母与丝杠之间的性能，提高了使用寿命，优选的，采用压力角为60度的角接触球轴承。
进一步地，所述丝杠1中还设有沿丝杠轴向设置的冷却通道11，具体地，在丝杠的中心沿轴向方向加工有贯穿丝杠两端的冷却通道，通过向冷却通道注入冷却液，图中箭头为冷却液的流动方向，可以进一步的对丝杠以及丝杠螺母进行降温，保证丝杠和丝杠螺母的性能和使用寿命。
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，根据本发明的技术方案及其发明构思加以等同替换或改变，都应涵盖在本发明的保护范围之内。

Claims (8)

  1. 一种高速螺母旋转进给丝杠装置，其特征在于：包括丝杠、丝杠螺母、轴承单元以及驱动单元；
    所述丝杠通过丝杠座固定在机床上；
    所述轴承单元包括轴承内固定套筒、轴承外固定套筒以及轴承组件，所述轴承外固定套筒套在所述轴承内固定套筒上，所述轴承外固定套筒与所述轴承内固定套筒之间形成轴承安装空间，所述轴承组件安装在所述轴承安装空间内，所述轴承内固定套筒一端为用于与丝杠螺母一端固定连接的丝杠螺母连接端，另一端为用于与驱动单元固定连接的驱动单元连接端；
    所述丝杠螺母设置在所述丝杠上且一端与所述轴承内固定套筒的丝杠螺母连接端固定连接；
    所述驱动单元包括第一带轮、第二带轮、同步带以及驱动电机，所述第一带轮与所述驱动电机连接，所述第二带轮套在所述丝杠上且与所述轴承内固定套筒的驱动单元连接端固定连接，所述第一带轮与所述第二带轮之间通过同步带连接。
  2. 根据权利要求1所述的高速螺母旋转进给丝杠装置，其特征在于：所述轴承内固定套筒与所述轴承外固定套筒之间靠近丝杠螺母连接端的一端设有轴承密封圈。
  3. 根据权利要求2所述的高速螺母旋转进给丝杠装置，其特征在于：所述轴承外固定套筒上还设有与所述轴承密封圈连通的注油通道。
  4. 根据权利要求1至3任意一项所述的高速螺母旋转进给丝杠装置，其特征在于：所述驱动电机与所述第一带轮之间还设有力矩限制器。
  5. 根据权利要求4所述的高速螺母旋转进给丝杠装置，其特征在于：所述轴承组件包括两组对称设置的角接触球轴承，每组角接触球轴承包括至少一个角接触球轴承。
  6. 根据权利要求1所述的高速螺母旋转进给丝杠装置，其特征在于：所述轴承内固定套筒为阶梯轴套筒结构，所述轴承内固定套筒靠近驱动单元连接端的一端设有外螺纹，所述轴承组件通过锁紧螺母 固定在所述轴承内固定套筒上。
  7. 根据权利要求6所述的高速螺母旋转进给丝杠装置，其特征在于：还包括压盖，所述压盖通过螺钉分别与滑台和轴承外固定套筒靠近驱动单元连接端的一端固定连接。
  8. 根据权利要求1至3任意一项所述的高速螺母旋转进给丝杠装置，其特征在于：所述丝杠中还设有沿丝杠轴向设置的冷却通道。
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