Linear motion device

A straight-forward, straight-line moving technology, applied in the direction of transmission, belt/chain/gear, mechanical equipment, etc., can solve the problems of insufficient thickener strength, unsatisfactory service life, lack of heat resistance and oil film retention, etc. Achieves the effects of inhibiting the formation of abnormal structures, relieving impact loads, and high surface hardness

Inactive Publication Date: 2006-06-21
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the insufficient strength of the thickener, the lack of heat resistance and oil film retention, especially for electric injection molding machines and presses that apply high loads, their life cannot be satisfied.

Method used

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  • Linear motion device
  • Linear motion device
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0175] Examples related to the straight-feeding device of the present invention and comparative examples compared with the examples will be described. That is, the tests of Examples 1 to 7 for confirming the effects of the straight-line device of the present invention and Comparative Examples 1 to 11 for comparison with the examples will be described.

[0176] In the test, a ball screw with a nominal number of 25×10×500-C5 according to JIS1192 was used, and a ball screw durability tester manufactured by NSK was used under the following test conditions to record the time when damage such as abrasion or peeling occurred.

[0177] Using the Weibull function distribution, within 10 samples, the time to reach 10% of the life of the ball screw from the side with the shortest life was obtained, and this was used as the test life.

[0178] Calculate the theoretical life time under each test condition, and express the test result as the ratio of the test time to the theoretical life ti...

Embodiment 23 and Embodiment 24

[0309] In Example 23 and Example 24, the male thread groove of the threaded shaft has a radius of curvature within the range specified in this embodiment, but the radius of curvature of the female thread groove of the nut is smaller than the radius of curvature within the range specified in this embodiment.

[0310] Radius of curvature of threaded shaft / ball diameter (%)

[0311] The holder is made of nylon, the concave surface facing the ball is conical, and the outer diameter is 0.8 times the diameter of the ball. In addition, when it is assumed that the total clearance S1 is greater than 0 (S1>0) and one retainer at the rear end is removed, the clearance (S2) between the ball at the beginning and the ball at the rear end is set to be smaller than the outer diameter (ds) of the retainer 0.8 times (S2<0.8×ds).

Embodiment 26

[0434]In the test ball screw of Example 26, a grease composition containing zinc naphthenate in an amount ranging from 0.05 to 12% by mass was enclosed, and in the test ball screw of Example 27, the content of succinic acid half ester was enclosed in a range of 0.05 to 12% by mass. Grease compositions varied in the range of 12% by mass, the test ball screw of Example 28, and grease compositions in which the content of nickel dithiocarbamate was varied in the range of 0.05 to 12% by mass.

[0435] exist Figure 12 shows the measurement results of the peeling life of the test ball screw used in Example 26 and Example 27, and the peeling life ratio of the test ball screw used in Comparative Example 26 as 1.0. Depend on Figure 12 It can be seen that the peeling life of the ball screw can be greatly improved by enclosing a grease composition containing 0.1 to 10 mass of zinc naphthenate or succinic acid half ester.

[0436] In addition, in Figure 13 shows the results of the pe...

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Abstract

The invention provides an electric injection molding machine and an electric press machine under the intermittent action of high load and a long-life straight-feeding device used in short-stroke reciprocating motion parts. In the ball screw thread 1 of the straight-feeding device of the present invention, between the adjacent rolling elements 9, retainers 21 respectively having two concave surfaces 23 facing the rolling elements 9 are provided, and at the same time, residual Austenite reaches a cyanide layer of 15 to 40% by volume.

Description

[0001] The patent application for the present invention is a divisional application of the patent application for invention submitted on April 11, 2003 with the application number "03110126.7" and the title of the invention as "straight-feeding device". technical field [0002] The present invention relates to a straight-feeding device, particularly to a ball thread, and in detail, to an electric injection molding machine, an electric press, etc., which are used for high-frequency shaking parts when performing short-stroke reciprocating motions under the action of intermittent high-load loads. long-life linear device. Background technique [0003] In recent years, as a straight-forward device instead of a hydraulic cylinder, to convert the rotary motion of an electric injection molding machine and an electric press into a straight-forward motion, and to make the straight-forward movement smooth without friction loss, most balls or The roller is used as a straight-forward dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H25/22F16H25/24
Inventor 沖田滋田中进宇山英幸矶贤一
Owner NSK LTD
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