CN102161163B

CN102161163B - Unidirectional rotating shaft locking device

Info

Publication number: CN102161163B
Application number: CN2011100714686A
Authority: CN
Inventors: 马祥英; 何桂华; 刘水养; 冯建国; 苏远彬; 罗华; 蒋丽蓉; 李军; 余丕亮
Original assignee: GUILIN MACHINE TOOL CO Ltd
Current assignee: GUILIN MACHINE TOOL CO Ltd
Priority date: 2011-03-23
Filing date: 2011-03-23
Publication date: 2012-11-21
Anticipated expiration: 2031-03-23
Also published as: CN102161163A

Abstract

The invention discloses a unidirectional rotating shaft locking device, comprising a locking mechanism, wherein the locking mechanism is arranged on a shaft end of the rotating shaft, which extends out of a bearing seat. The locking mechanism also comprises a ring-shaped cylinder sheathed from outside to inside, an overrunning clutch, a thrust bearing and a thrust spring, wherein the ring-shaped cylinder is arranged in a fixed sleeve which is fixedly connected with the bearing seat coaxially; the inner end of an inner ring of the overrunning clutch is in contact with a cylinder piston and is connected with a shaft end key; the outer end of an outer ring of the overrunning clutch is provided with the thrust bearing, and the inner end of the outer ring of the overrunning clutch is opposite to a friction plate at the outer end of the fixed sleeve; the thrust bearing is supported by the thrust spring which is limited by a spring check ring; an oil path which is connected with an external hydraulic system is arranged inside the shaft end; and the oil path is communicated with the ring-shaped cylinder. In the invention, the unidirectional rotation characteristic of the overrunning clutch is applied to the rotating shaft locking mechanism, therefore, the the unidirectional rotating shaft locking device has the advantages of simple structure and reliable work and can stop the reverse rotation of the rotating shaft effectively during power failure. The unidirectional rotating shaft locking device is most applicable to a vertically-transmission ball screw of a numerical control machine.

Description

Rotating shaft one-way locking device

(1) technical field:

The present invention relates to rotating shaft mechanism, specifically is a kind of rotating shaft one-way locking device.

(2) background technology:

The motion branch of rotating shaft rotates and reverse; But in some special frame for movements, but only need the just commentaries on classics of rotating shaft, and the counter-rotating of rotating shaft will cause mechanical breakdown even influence mechanical performance; Like platen vertical lift ball screw (rotating shaft a kind of); Owing to himself self-lock ability deficiency, after worktable lifting put in place, the ball screw that stops operating was by the retaining mechanism fixed position of being located on the lathe; Prevent that weight because of workbench from causing the counter-rotating of ball screw, workbench descends voluntarily and accident occurs.

Used lathe retaining mechanism is most to be automatically controlled controlling (minority is for manual), and when accident had a power failure, the lathe retaining mechanism can not normally play a role and cause locking to be lost efficacy.

(3) summary of the invention:

To the weak point of traditional retaining mechanism, countershaft locking prevents the rotating shaft one-way locking device that reverses when the purpose of this invention is to provide a kind of the power failure.

Can realize above-mentioned purpose rotating shaft one-way locking device; Comprise retaining mechanism; Different is, and said retaining mechanism is located at rotating shaft stretches on the axle head outside bearing block, comprise from outer inwardly sheathed annular cylinder, freewheel clutch, thrust bearing and thrust spring, said annular cylinder be located at the coaxial fixed cover that is connected of bearing block in; The freewheel clutch inner ring is inner to be connected with the oil cylinder piston contact and with the rotating shaft key; Outer end, freewheel clutch outer ring is provided with thrust bearing, and is inner relative with the fixed cover outer end, and said thrust bearing is supported by the spacing thrust spring of check ring; The oil circuit that connects external hydraulic system is offered in said axle head inside, and said oil circuit is communicated with annular cylinder.

Hydraulic system fuel feeding during work outwards promotes freewheel clutch, and separate with the fixed cover outer end the inner, freewheel clutch outer ring, normally rotating of rotating shaft; During power failure; The hydraulic system pressure release; Thrust spring pressure inwardly promotes freewheel clutch freewheel clutch the inner is contacted with the fixed cover outer end greater than oil cylinder piston thrust, relies on frictional force restriction freewheel clutch outer ring between the two to rotate; Rotating shaft this moment can be rotated by former direction, but the freewheel clutch outer ring that its counter-rotating is braked restriction.

For improving brake force, the inner, said freewheel clutch outer ring and/or fixed cover outer end are provided with the friction plate that increases frictional force.

For preventing leakage of oil, between said annular cylinder and the rotating shaft sealing ring is set.

Said thrust spring is selected butterfly spring for use.

Advantage of the present invention:

Rotating shaft one-way locking device of the present invention applies to freewheel clutch one-directional rotation characteristic on the rotating shaft retaining mechanism, and is simple in structure, and reliable operation can effectively stop the rotating shaft counter-rotating when having a power failure, and is suitable for most using on the vertical transmission ball screw of Digit Control Machine Tool.

(4) description of drawings:

Fig. 1 is the structural representation of one embodiment of the present invention.

Figure number sign: 1, bearing block; 2, rotating shaft; 3, thrust bearing; 4, thrust spring; 5, fixed cover; 6, freewheel clutch inner ring; 7, oil cylinder piston; 8, flat key; 9, freewheel clutch outer ring; 10, friction plate; 11, check ring; 12, cylinder body.

(5) specific embodiment:

Vertical transmission ball screw with Digit Control Machine Tool is an example, describes the technical scheme of rotating shaft one-way locking device of the present invention.

Rotating shaft one-way locking device of the present invention is located at rotating shaft 1 (ball screw) and is stretched on the axle head below the bearing block 1, the coaxial fixed cover 5 that is connected on the said bearing block 1; From axle head upwards movable set annular cylinder, freewheel clutch, thrust bearing 3 and thrust spring 4 successively, wherein annular cylinder places in the fixed cover 5, and is as shown in Figure 1.

The cylinder body 12 of said annular cylinder is provided with sealing ring by the shaft shoulder location of axle head between cylinder body 12 and the axle head, and oil cylinder piston 7 places in the cylinder body 12, is provided with sealing ring between oil cylinder piston 7 and the axle head equally, and is as shown in Figure 1.

Said freewheel clutch inner ring 6 is connected with axle head through flat key 8, and the upper end of freewheel clutch inner ring 6 contacts with oil cylinder piston 7; In the snare of 9 lower ends, freewheel clutch outer ring thrust bearing 3 is set; Thrust bearing 3 (thrust ball bearing) is supported by thrust spring 4 (butterfly spring); (check ring 11 is by forcing the jack panel adjusting position in order to be located at check ring 11 on the axle head for butterfly spring spacing; The corresponding pressure of regulating butterfly spring), 9 upper ends, freewheel clutch outer ring corresponding the friction plate 10 that is provided with of fixed cover 5 lower ends, as shown in Figure 1.

The coaxial oil circuit of offering in the said axle head, the oil pocket on the oil circuit between logical cylinder body 12 and the oil cylinder piston 7, the axis end face is connected with hydraulic system under the oil circuit, and is as shown in Figure 1.

Locking device state when the Digit Control Machine Tool operate as normal (system has) shown in Figure 1, this moment, separated with the friction plate 10 of fixed cover 5 lower ends 9 upper ends, freewheel clutch outer ring.

Claims

1. rotating shaft one-way locking device; Comprise retaining mechanism; It is characterized in that: said retaining mechanism is located at rotating shaft (2) and is stretched on the axle head outside bearing block (1), comprise from outer inwardly sheathed annular cylinder, freewheel clutch, thrust bearing (3) and thrust spring (4), said annular cylinder be located at the coaxial fixed cover that is connected of bearing block (1) (5) in; Freewheel clutch inner ring (6) is inner to be connected with oil cylinder piston (7) contact and with the axle head key; Outer end, freewheel clutch outer ring (9) is provided with thrust bearing (10), and is inner relative with fixed cover (5) outer end, and said thrust bearing (10) is supported by the spacing thrust spring (4) of check ring (11); The oil circuit that connects external hydraulic system is offered in said axle head inside, and said oil circuit is communicated with annular cylinder.

2. rotating shaft one-way locking device according to claim 1 is characterized in that: (9) the inner, said freewheel clutch outer ring and/or fixed cover (5) outer end are provided with friction plate (10).

3. rotating shaft one-way locking device according to claim 1 and 2 is characterized in that: between said annular cylinder and the axle head sealing ring is set.

4. rotating shaft one-way locking device according to claim 1 and 2 is characterized in that: said thrust spring (4) is a butterfly spring.