CN85107269A

CN85107269A - Hydrostatic pressure worm-rack devices

Info

Publication number: CN85107269A
Application number: CN 85107269
Authority: CN
Inventors: 渡边纮也; 羽山定治
Original assignee: Toshiba Machine Co Ltd
Current assignee: Shibaura Machine Co Ltd
Priority date: 1985-09-28
Filing date: 1985-09-28
Publication date: 1987-05-27
Also published as: CN85107269B

Abstract

A kind of hydrostatic worm rack device, its type comprises a worm screw, on relative two flanks of its each tooth, makes the working oil supply hole.On relative two flanks of each tooth of above-mentioned tooth bar, be provided with oily cave, there is an oil distributor to be installed on worm shaft one end, the mating surface of working oil being supplied with worm tooth and rack tooth reaches not mating surface, and will control oil and supply with at the worm screw opposite end, the flank of the tooth of elder generation and rack tooth engagement is controlled oily supply hole.

Description

Hydrostatic pressure worm-rack devices

The relevant a kind of hydrostatic pressure worm-rack devices of the present invention, for example as the person that is used for the lathe.

Hydrostatic pressure worm-rack devices in the prior art can be divided into two types.One type static pressure oil supplied with from the tooth bar side, and another kind of type is supplied with static pressure oil from the worm screw side.About last type, for example just like U. S. Patent the 3rd, 789, the 956 and the 4th, 148, No. 227 those disclosed herein, back one type is for example just like U. S. Patent the 3rd, 595, and No. 100 and 3,763, those disclosed herein in No. 959.These patent cases have illustrated a kind of structure, and its static pressure oil distributes from each end face of worm screw, and in another kind of structure, is arranged on the mutual balance of thrust that produces in the static pressure oil cave of worm screw left end and right-hand member.

Hydrostatic worm rack device is used in the lathe as work feeder.Raising along with the feed speed of recent lathe, the also corresponding increase of the revolution of worm screw, thereby caused to the lubricant oil in the oily cave of discord tooth bar engaged worm flank fuel feeding, because of centrifugal action splashes, therefore, when worm screw meshed with tooth bar afterwards, air was trapped within the oily cave, impel the variation in pressure in the oily cave, just can not obtain high speed feed stably.

In addition, in the structure in prior art, owing to do not control oily supply hole, and control the two ends that oily drain tank is located at worm screw, worm screw begins in this end and tooth bar engagement, and therefore the oil pressure in the oily cave raises, and makes to be trapped in that air can not be discharged from the oily cave, so the pressure pulsation in the oily cave has just hindered feeding stably.

In the structure of prior art, with working oil when opening fuel feeding in flank and supply with because working oil is supplied with by the end of worm screw, reach in working oil before the oil supply hole of far-end, the pressure loss just takes place.Therefore, in corresponding oily cave, can not obtain uniform pressure, so can not make high speed feed.And, do not establish device and keep in the flank constant pressure of working oil in the corresponding oil supply hole.

An object of the present invention is to provide a kind of improved hydrostatic pressure worm-rack devices, can prevent from air entrapment is gone in the oily cave of the side of worm screw two ends discord tooth bar engagement, and when worm screw and tooth bar engagement, keep the pressure unanimity in each static pressure oil cave, thereby help such as making lathe that high speed feed stably be arranged.

Type according to a kind of hydrostatic pressure worm-rack devices proposed by the invention, worm screw wherein has the working oil supply hole in the relative bi-side of its each tooth, one toothed rack and worm meshing are arranged, static pressure oil cave is arranged on the relative bi-side of each tooth of tooth bar, the modiolus that the drive unit worm screw is arranged, and there is device to supply with working oil to the worm screw oil supply hole, being characterized as of this device is provided with the end that an oil distributor is installed in modiolus, mating surface fuel feeding to worm tooth and rack tooth, to being that the worm screw opposite end is supplied with control oil with the control oil supply hole that the flank of rack tooth engagement is provided with at first, and be provided with the oil duct that passes modiolus and pass each worm tooth, supply with working oil and control oil respectively.

The accompanying drawing brief introduction is as follows:

Fig. 1 is a longitudinal sectional view, represents an embodiment of hydrostatic pressure worm rack transmission device proposed by the invention;

Fig. 2 is that of oil distributor shown in Figure 1 gives to profile perspective;

Fig. 3 is that Fig. 1 is along III-III line sectional view;

Fig. 4 is that Fig. 1 is along IV-IV line sectional view;

Fig. 4 A is the partial sectional view of worm rack tooth, diagram by worm tooth the fuel feeding road and be the relation between the oily cave of rack tooth setting;

Fig. 5 is the sectional view along V among Fig. 1-V line;

Fig. 6 is the sectional view along VI among Fig. 5-VI line.

Now be described herein as follows with reference to accompanying drawing to the present invention:

In the present invention, term " working oil " comprises " static pressure oil ", " control oil " and " auxiliary oil ", and static pressure oil indication is for supplying with the working oil in oily cave, control oil refers to supply with when worm screw and tooth bar begin to mesh the working oil in oily cave, assists oil then to refer to the working oil of supplying with to the worm screw oil supply hole when the engagement of worm screw discord tooth bar.

Now an embodiment of the hydrostatic pressure worm-rack devices that the present invention is proposed is done following narration.As Fig. 1 and shown in Figure 4, tooth bar 100 is fixed on lathe or the similar mechanical fixed lathe bed, and mobile work platform supporting of a worm screw 30 usefulness is arranged.Have the drive unit of motor and so on to drive worm screw 30 placements, drive unit is installed on the mobile work platform, drives mobile work platform and moves on the slide rail of fixed bed.

In this embodiment, the purposes of working oil is: (1) is made hydrostatic oil and is supported worm screw and tooth bar, (2) making control oil prevents in the static pressure oil cave of air entrapment on tooth bar, (3) as auxiliary oil, be when the engagement of worm screw discord tooth bar, the working oil of discharging from the flank of worm screw opposite end prevents entrapped air in static pressure oil cave.

From oil pump of pressurized source 1() pressure of compressed oil of output, be adjusted to predetermined value by a reduction valve.The share split of compressed oil is regulated necessary flow by flow control valve 3a-3d respectively, then by

oil duct

6,7,8 and 9, infeeds respectively in the

edge conduit

11,12,13 and 16 of the oil distributor 10 that rotatably is installed on the worm shaft 20 and goes.Then as described below, supply with the mating surface of worm tooth and tooth bar with compressed oil.

Contrast Fig. 1 to Fig. 6 narrates static pressure oil below, control stain, and the passage of auxiliary wet goods.

Static pressure oil passage, the purpose of this passage setting are working oil to be supplied in the static pressure oil cave go, and by the flank fuel feeding of oil supply hole to the opposite end, worm screw 30 are done hydrostatic supporting.

Concrete condition is the left flank of oil duct 6 with a tooth of static pressure oil supply worm screw, and oil duct 7 is supplied with right tooth flank with static pressure oil.Oil duct 6 and 7 is connected the

circular groove

12 and 11 of oil distributor 10 respectively.Though Fig. 1 do not show, oil distributor 10 supported with rotatable method formula by a stationary cylinder, has oil duct and oil duct 6-9 and

groove

11,12,13 to be connected with 16 in the cylinder.

As shown in Figure 2, circular groove 11 is by curve bath 11b and 12b correspondence on the internal surface of aperture 11a and oil distributor 10.In addition, worm shaft 20 is provided with

vertical oil duct

24 and 26, with the circumference of the concentric circle of worm shaft 20 on, place with equidistant intervals.Oil duct 24 is connected

oil duct

23 and 25 respectively with 26.Oil duct 24 is connected on the intermediate portion of worm shaft 20 with radial passage 27, and passage 27 is connected by worm screw 30 and some vertical oil ducts 28 again, and oil duct 28 is equidistant intervals in a circumferential direction.Some oil ducts 29 are connected with oil duct 28 respectively by the corresponding tooth on the worm screw, to the left flank of the respective teeth of worm screw 30, supply with static pressure oil and auxiliary oil.Static pressure oil and auxiliary oil by the oil duct 32 that is connected with oil duct 31, supply to the right tooth flank of respective teeth also in an identical manner.These oil ducts 28 are also the same with

oil duct

24 and 26 with 31, and equidistant layout on circumference is passed through from worm shaft 20.

Oil distributor 10 curve bath 11b among supply Fig. 2 and the pressure that working oil produced of 12b cause the power of tending to promote worm shaft 20, make worm shaft 20 deflections.Therefore must eliminate this power.In order on the surface on curve bath 11b and 12b opposite, to cause identical power, on the internal surface of oil distributor 10, be a pair of

curve bath

14b and 15b, to circular

groove

11 and 12 working oil of supplying with, supply with to curve

bath

14b and 15b by

aperture

14a and 15a.

Arranged to supply with the oil duct of static pressure oil to flank, oily cave 101 on the left of just static pressure oil can being supplied with by a loop ', comprise passage 7 in this loop, circular groove 11, aperture 11a, curve bath 11b,

oil duct

23,24,27,28 and 29.Static pressure oil again in the same way, by passage 6, circular groove 12, aperture 12a, curve bath 12b,

oil

25,26,36 ', 31 and 32, supply with the oil cave 101, right side that rack tooth is provided with.Like this, the left flank and the right tooth flank of worm tooth, just by supply with hydrostatic

oily cave

101 and 101 in the tooth bar 100 ' working oil, do hydrostatic supporting.

In order to prevent air entrapment, by the loop, the hole on the not engaging tooth side of the tooth at auxiliary oily worm screw two ends 34 is supplied with, comprise passage 9 in the loop, the circular groove 13 of oil distributing pipe 10, aperture 13a, U-groove bevel 13b,

oil duct

24,26,27,36,28,31,29 and 30.Shown in Figure 4 the clearest,

oil duct

29 and 32 is alternate with each other, connects worm screw.

For the oil pressure in some

axial oil ducts

28 and 31 is remained a constant numerical value, must make the axial length of these oil ducts constant.For this purpose, the length regulation cock 35 corresponding, be screwed into the two ends of oil duct with screw thread with worm screw 30 lead angles, as shown in Figure 1, this length measures from the end face of worm screw.When worm screw 30 and tooth bar 100 begin to mesh,, be convenient to the tooth bar side is cleaned in order to supply with compressed oil to the hydrostatic oily cave of worm screw opposite end Pi, and removing residual air, on the relative flank at two ends, make and lead to the curve bath 34 that meshes starting point, as shown in Figure 6.The control stain is supplied with to oil supply hole 33 by a loop, comprises flow control valve 3d in this loop, passage 8, oil duct 16, worm shaft circular groove 35, aperture 35a, axially oil duct 36 and radial direction oil 37.

A kind of hydrostatic worm rack device that the present invention proposes has following various advantage:

(1) because when worm screw was rotated, working oil did not splash from the not engaging tooth side of worm tooth, and owing to do not have air entrapment between the engaging tooth side of worm screw and tooth bar, the pressure in the fluid pressure oil cave is constant, can guarantee that just feeding is steady.

(2) owing to make 3 control oilhole mouths and control oil groove on worm screw end tooth side, when worm screw and tooth bar engagement, the pressure between hydrostatic oily cave inlet hole and the exit orifice can not raise.In addition since in hydrostatic oily cave entrapped air not, the pressure in the oily cave can not pulsed, thereby can guarantee that feeding is steady.

(3) because a unified oil pressure to the flank supply, and owing to the consistent length of retainer shaft to

oil duct

28 and 31, just may be caused in the center of the axial oil duct of working solution from worm shaft in oily cave.

Claims

1, a kind of hydrostatic worm rack device, its type comprises a worm screw (30), on relative two flanks of its each tooth, make the working oil supply hole, the engagement of one toothed rack (100) and above-mentioned worm screw (30) is arranged, on relative two flanks of each tooth of above-mentioned tooth bar (100), make hydrostatic oily cave (101), there is a drive unit to drive the axle (20) of above-mentioned worm screw (30), there is device that working oil is supplied with the above-mentioned fuel feeding aperture of above-mentioned worm screw (30), has been characterized as down array apparatus:

There is an oil distributor (10) to be installed on the end of above-mentioned worm shaft (20), reach not engaging tooth surface supply working oil to the engaging tooth surface of above-mentioned worm tooth and tooth bar (100) tooth, and on above-mentioned worm screw (100) opposite end, control oil supply hole on the flank of first and above-mentioned rack tooth engagement is supplied with control oil

Reach the oil duct that from each tooth of above-mentioned worm screw (100), passes through from above-mentioned worm shaft (20), supply with above-mentioned working oil and above-mentioned control oil respectively.

2, the hydrostatic worm rack device that is proposed as 1 of claim the, being characterized as has flow regulator to be connected between above-mentioned working solution supplier and the above-mentioned oil distributor in addition.

3, the hydrostatic worm rack device that is proposed as 1 of claim the, be characterized as above-mentioned oil distributor within it on the surface, be provided with～to curve bath, compressed oil is supplied with the relative flank of above-mentioned worm tooth, second pair of curve bath arranged, relative with first pair of curve bath diametric(al), and have and above-mentioned first pair of pressure area that curve bath is identical.

4, the hydrostatic worm rack device that is proposed as 1 of claim the, be characterized as above-mentioned oil duct and some axial oil ducts arranged in above-mentioned worm shaft, on a circumferencial direction with the concentric circle of above-mentioned worm shaft, uniformly-spaced be provided with, and some radial direction oil are arranged, uniformly-spaced arrange in a circumferential direction, be connected with a circular groove of above-mentioned oil distributor.

5, the hydrostatic worm rack device as proposing in 1 of the claim the, being characterized as has regulation cock in addition, and length is consistent with the lead angle of above-mentioned worm screw, is screwed into the above-mentioned oil duct that passes worm screw in the axial direction with screw thread.

6, the hydrostatic worm rack device as proposing in 1 of the claim the, be characterized as above-mentioned control oil and supply with oil duct and adjacent with it above-mentioned static pressure oil and supply with between the aperture and have at interval, make above-mentioned control oil supply passage and above-mentioned static pressure oil supply with the aperture not to same oily cave opening.