TW201832850A - Hydraulic chuck with leak proof oil rings capable of having better oil tight effect when the machine is shut down and preventing abrasion when the machine is in operation - Google Patents

Abstract

A hydraulic chuck with a leak proof oil ring includes a base, a shaft seat, a rotating shaft unit, a plurality of leak proof oil rings and a collet unit. A gap is formed between a first side surface of the shaft seat and a second side surface of the rotating shaft unit for allowing pressurizing oil to flow therethrough. The plurality of leak proof oil rings are mounted between the first side surface and the second side surface, and each of the oil leak proof rings has a base wall crossing the gap and extended from the first side surface to the second side surface, a first annular wall connected to the base wall and fixed to the shaft seat, and a second annular wall connected to the base wall and adjacent to the rotating shaft unit. When being subject to the detent of the pressuring oil, the second annular ring can be oil-tightly abutted against the rotating shaft unit. When the machine is shut down, the second annular wall is elastically deformed by the pressuring oil, so as to achieve better oil tight effect. When the machine is in operation, the second annular wall does not contact the rotating shaft unit, so as to prevent generating high temperature friction, and to slow down aging of those leak proof oil rings.

Description

Hydraulic chuck with oil leakage ring

The invention relates to a machine tool, in particular to a hydraulic chuck having a leak-stop oil ring.

The utility model relates to a hydraulic collet of a machine tool (TTW No. 557239), which comprises a base and a fixed seat, a sleeve, a two bearing, a rotating seat and a cymbal mounted inside the machine base. a movable seat, a pull rod, a front shaft cover, a rear axle cover, a front collet and a rear collet. When the pressure oil passes through an oil passage that can pass through the base, the fixed seat, and the rotating seat, and the turbulent seat is swayed, the swaying seat can be the front collet, The rear collet creates the purpose of tightening or loosening.

Generally, a gap for the penetration of the pressure oil is formed between an outer ring surface of the rotating seat and an inner annular surface of the fixing seat, and the outer ring surface of the rotating seat and the inner ring of the fixing seat A plurality of oil leakage rings are also installed between the faces, and the oil leakage rings have a circular cross section under normal conditions.

When the machine tool is in the stop state and the hydraulic chuck is to be clamped or released by a hydraulic chuck, the pressure oil is started to be introduced from the oil passage and penetrates into the gap. The ideal state is the pressure of the pressure oil. It will force the oil leakage ring to deform, and prevent the pressure oil from leaking. When the pressure of the pressure oil is small, the deformation of the oil leakage ring is not enough, and leakage will occur. To prevent leakage and to allow the oil leakage ring to produce sufficient deformation, the pressure of the pressure oil must be increased, but increasing the pressure of the pressure oil may also cause leakage.

Furthermore, if the leakage preventing oil ring is kept in contact with the rotating member even in the operating state, in order to prevent leakage, the pressure can be made in the stopped state without increasing the pressure. The leak stop oil ring produces better leak resistance. However, as a result, the oil leakage preventing rings are likely to be worn, and the high temperature is easily deteriorated due to continuous friction.

Accordingly, it is an object of the present invention to provide a hydraulic collet having a leak-stop oil ring which is simple in construction and which produces a better leakage preventing effect during shutdown and prevents wear during operation.

Accordingly, the present invention has a hydraulic collet for a leak-stop oil ring for holding at least one workpiece, the hydraulic collet comprising a base, a shaft seat, a shaft unit, a plurality of oil leakage preventing rings and a collet unit . The shaft seat is mounted inside the base and has a first side. The shaft unit extends along an axis and is rotatably axially disposed inside the shaft seat and has a second side opposite to the first side. Forming a gap between the first side and the second side for the flow of the oil, the oil leakage ring is mounted between the first side and the second side, and each has a gap across the gap The first side extends to the base wall of the second side, a first ring wall connected to one side of the base wall and fixed to the shaft seat, and the other side of the base wall is adjacent to the rotating shaft a second annular wall of the unit, the first annular wall and the second annular wall together define an oil groove that can communicate with the gap. When the machine is stopped, the pressure oil drained to the oil groove along the gap can be The second ring wall is oscillated with respect to the first ring walls, and is oil-tightly abutted against the rotating shaft unit. The collet unit is sleeved inside the rotating shaft unit and driven by the pressurized oil to the workpiece Tighten or loosen.

The utility model has the advantages that: the structural design of the oil leakage preventing ring, when the rotating shaft unit is in a static state, the second annular wall can be oil-tightly resisted by the rotating shaft unit when the hydraulic oil is swayed by the pressure oil, when When the rotating shaft unit is in operation, micro contact is generated between the second ring wall and the rotating shaft unit to avoid wear and high heat generation due to friction.

Referring to Figures 1, 2 and 3, an embodiment of a hydraulic collet having a leak-stop oil ring of the present invention is used for clamping at least one workpiece (not shown), the hydraulic collet comprising a base 10 a shaft seat 20, a shaft unit 30, a plurality of oil leakage preventing ring 40, a collet unit 50, and a bearing 60 which is respectively sleeved between the shaft seat 20 and the rotating shaft unit 30, and a first check valve 70. And a second check valve 80.

The base 10 has an inner side surface 11 defining an inner hole 111, an outer side surface 12 opposite to the inner side surface 11, and a first guiding hole 13 and a first communicating hole 13 connected to the inner side surface 11 from the outer side surface 12. A second guiding hole 14 which is disposed offset from the first guiding hole 13 and can be electrically connected to the outer side by the inner side surface 11 is disposed along an axis L.

The shaft base 20 is fixedly mounted in the inner hole 111 of the base 10 and has a first side surface 21 extending perpendicular to the inner side surface 11 and extending along a radial direction Y perpendicular to the axis L. The first side surface 21 communicates with the first oil inlet hole 22 of the first guiding hole 13 , and is disposed offset from the first oil inlet hole 22 and communicates with the first side surface 21 and the second guiding hole 14 . a second inlet oil hole 23, a plurality of first recesses 24 recessed from the first side surface 21 and located on both sides of the first oil inlet hole 22 and the second oil inlet hole 23 in the radial direction Y, respectively The two first grooves 24 between the first oil inlet hole 22 and the second oil inlet hole 24 communicate with each other.

The shaft unit 30 extends along the axis L and is rotatably disposed inside the shaft seat 20, and includes a main body 301 and a driving wheel base 302 fixed to one side of the main body 301. The main body 301 and the driving wheel base A cylinder chamber 303 is formed between 302. The main body 301 has a second side surface 31 extending in the radial direction Y relative to the first side surface 21, and a first oil guiding passage 32 communicating with the second side surface 31 and the cylinder chamber 303. The first oil guiding passage 32 is staggered and communicates with the second oil guiding passage 33 between the second side surface 31 and the cylinder chamber 303 (cooperating with reference to FIG. 6 and FIG. 7 ), and is mostly recessed by the second side surface 31 . And a second groove 34 located on both sides of the first oil guiding channel 32 and the second oil guiding channel 33 along the radial direction Y, and located in the first oil guiding channel 32 and the second oil guiding channel 33 The two second recesses 34 communicate with each other. The second recesses 34 are defined by a groove bottom surface 341 and a groove side surface 342 which intersects the groove bottom surface 341. A port of the first oil guiding passage 32 and the second oil guiding passage 33 communicating with the cylinder chamber 303 is respectively disposed on both sides of the cylinder chamber 303 corresponding to the axis L. And forming a gap 90 for the pressure oil to flow between the first side surface 21 and the second side surface 31, the gap 90 communicating with the first and second oil holes 22, 23 and the first and second oil guides Roads 32, 33.

The oil leakage preventing rings 40 are respectively installed between the first side surface 21 and the second side surface 31, and each has a base wall extending across the slit 90 and extending from the first side surface 21 to the second side surface 31. 41. A first ring wall 42 connected to one side of the base wall 41 and fixed to the shaft seat 20, a second ring wall 43 connected to the other side of the base wall 41 and adjacent to the rotating shaft unit 30 The base wall 41, the first ring wall 42 and the second ring wall 43 together define an oil groove 44 that can communicate with the gap 90. The first ring walls 42 are respectively embedded in the first groove 24, the second annular walls 43 are respectively sleeved in the second concave grooves 34, the width of the second annular walls 43 corresponding to the radial direction Y is smaller than the width of the corresponding second concave grooves 34, and A first thickness t1 of the first annular wall 42 perpendicular to the radial direction Y is greater than a second thickness t2 of the second annular wall 43 perpendicular to the radial direction Y. In addition, the two oil leakage preventing rings 40 located between the first oil guiding passage 32 and the second oil guiding passage 33 are integrally connected, and the two oil leakage sealing rings 40 integrally connected have an opposite one. The concave end surface 45 of the oil leakage groove 44 and the concave curved surface 46 recessed by the end surface 45 are connected to each other by a concave arc surface 46 of the oil leakage preventing ring 40. The arrangement of the concave curved faces 46 can reduce the area of the end faces 45.

The collet unit 50 has a set of the movable seat 51 disposed in the cylinder chamber 303. The collet unit 50 and the main body 301 can be respectively coupled with a shaft cover, a collet, and a pull rod (not shown, the tube The structure and the operation principle of the clamping unit 50 and the main body 301 and the shaft cover, the collet, and the tie rod are prior art, as disclosed in the TW Certificate No. I425997 patent, which will not be further explained here, and the swaying seat 51 is under pressure. The oil drive can interlock the shaft caps, the collet and the pull rod and can tighten or release the workpiece.

The first check valve 70 is installed inside the main body 301 of the rotating shaft unit 30 and is mounted on the first oil guiding passage 32. The first check valve 70 allows the pressure oil to be unidirectionally directed from the first oil inlet hole 22 toward The cylinder chamber 303 is guided, and the pressure oil of the cylinder chamber 303 is prevented from flowing back toward the first oil inlet hole 22.

The second check valve 80 is installed inside the main body 301 of the rotating shaft unit 30 and is mounted on the second oil guiding passage 33. The second check valve 80 allows the pressure oil to be unidirectionally directed from the second oil inlet hole 23 toward The cylinder chamber 303 is guided, and the pressure oil of the cylinder chamber 303 is prevented from flowing back toward the second oil inlet hole 23. (The structure and operation principle of the first and second check valves 70, 80 are prior art, as disclosed in the TW certificate number I425997, I535959, etc., and will not be further explained here)

Further, as shown in FIG. 1 and FIG. 2 and FIG. 3, the hydraulic chuck is in an operating state. At this time, the pressure oil is not introduced from the first and second guide holes 13 and 14, so that the leakage is stopped. The oil ring 40 is also not subjected to the action of the pressure oil. The second ring walls 43 do not elastically deflect relative to the first ring walls 42. The second ring walls 43 and the corresponding groove sides 342 When the drive wheel base 302 is driven by an external force and the entire rotary shaft unit 30 is rotated together with the collet unit 50 and the workpiece, and the workpiece is processed, the oil leakage preventing ring 40 is The second ring wall 43 does not excessively rub against the groove bottom surface 341 and the groove side surface 342 of the second groove 34, thereby preventing friction and temperature rise, thereby slowing down aging and prolonging the service life.

As shown in FIG. 4 and FIG. 5, when pressure oil (shown by an arrow) is introduced from the first guide hole 13, through the first oil inlet hole 22, the slit 90, the first oil guide 32, and When the first check valve 70 is opened, it can be smoothly introduced into the cylinder chamber 303, and the pressure oil will push the swaying seat 51 to move to the right side of FIG. 4 and FIG. 5 to enable the workpiece (not shown). The workpiece can be replaced by releasing the object. In this state, the pressurized oil is introduced into the slit 90 from the first oil inlet hole 22, and also flows in the radial direction Y to the oil leakage preventing ring 40 located on both sides of the first oil inlet hole 22. In the oil groove 44, the second ring wall 43 having a small thickness of the pressure oil may be elastically biased toward the corresponding groove side surface 342, so that the second ring wall 43 and the corresponding groove bottom surface 341, The groove side surfaces 342 are in close contact with each other and have a leakage preventing effect, so that the pressure oil can be prevented from flowing back to the second oil inlet hole 23 and the second oil guiding passage 33. When the pressure oil stops being introduced from the first guide hole 13, the first check valve 70 returns to the closed state again, and the first oil guide 32 is cut off, thereby preventing the pressure oil of the cylinder chamber 303 from facing the The first oil inlet hole 22 flows countercurrently. The second annular wall 43 of the oil leakage preventing oil ring 40 located on both sides of the first oil inlet hole 22 is no longer subjected to the pressure oil pressure, and is restored by the state of FIG. 5 to the state of FIG. status.

As shown in FIG. 6 and FIG. 7 , when pressure oil (shown by an arrow) is introduced from the second guiding hole 14 , through the second oil inlet hole 23 , the slit 90 , the second oil guiding channel 33 , and When the second check valve 80 is pushed open, it can be smoothly introduced into the cylinder chamber 303, and the pressure oil will push the swaying seat 51 to move to the left side of FIG. 6 and FIG. 7 to enable the workpiece (not shown). To achieve the purpose of clamping, the workpiece can be prepared for processing. In this state, the pressure oil is introduced into the slit 90 from the second oil inlet hole 23, and also flows in the radial direction Y to the oil leakage preventing ring 40 located on both sides of the second oil inlet hole 23. In the oil groove 44, the second ring wall 43 having a small thickness of the pressure oil may be elastically biased toward the corresponding groove side surface 342, so that the second ring wall 43 and the corresponding groove bottom surface 341, The groove side surfaces 342 are in close contact with each other and have a leakage preventing effect, so that the pressure oil can be prevented from flowing back to the first oil inlet hole 22 and the first oil guiding passage 32. When the pressure oil stops and is further introduced by the second guiding hole 14, the second check valve 80 returns to the closed state again, and the second oil guiding passage 33 is cut off, thereby preventing the pressure oil of the cylinder chamber 303 from facing the The second oil inlet hole 23 flows countercurrently. The second annular wall 43 of the oil leakage preventing ring 40 located on both sides of the second oil inlet hole 23 is no longer subjected to the pressure oil pressure, and is restored by the state of FIG. 7 to the state of FIG. status.

Therefore, in the hydraulic chuck of the present invention, when the rotating shaft unit 30 is in a stationary state, the second annular wall 42 of the oil leakage preventing ring 40 is swayed toward the corresponding groove bottom surface 341 and the groove side by the pressure of the pressure oil. The 342 is elastically biased to cause a leakage preventing effect between the oil leakage preventing ring 40 and the rotating shaft unit 30, and the pressure of the pressure oil is not required to be increased, and the oil leakage preventing ring 40 and the rotating shaft can be The unit 30 is oiltight. When the rotating shaft unit 30 is in operation, there is no excessive friction between the second annular wall 43 and the rotating shaft unit 30 to cause a high temperature condition, which can reduce wear and aging.

In addition, two integrally connected oil leakage preventing oil rings 40 between the first oil guiding passage 32 and the second oil guiding passage 33 are connected to each other by a semi-arc shape by the concave curved surfaces 46, thereby reducing the The area of the end face 45 can be made more flexible when the second ring wall 43 is elastically biased.

In summary, the present invention has a hydraulic chuck with a leak-stop oil ring, which has a simple overall structure, is easy to manufacture, and can indeed achieve the object of the present invention.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the equivalent equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still The scope of the invention is covered.

10‧‧‧ Pedestal
11‧‧‧ inside side
111‧‧‧ Inside hole
12‧‧‧Outside
13‧‧‧First guide hole
14‧‧‧Second guide hole
L‧‧‧ axis
20‧‧‧ shaft seat
21‧‧‧ first side
22‧‧‧First oil hole
23‧‧‧Second oil inlet
24‧‧‧First groove
Y‧‧‧ radial
30‧‧‧ shaft unit
301‧‧‧ Subject
302‧‧‧Drive wheel base
303‧‧‧Cylinder room
31‧‧‧ second side
32‧‧‧First oil channel
33‧‧‧Second oil channel
34‧‧‧second groove
341‧‧‧Ditch bottom
342‧‧‧Ditch side
40‧‧‧Oil leak ring
41‧‧‧ base wall
42‧‧‧First ring wall
43‧‧‧Second ring wall
44‧‧‧ oil groove
45‧‧‧End face
46‧‧‧ concave curved surface
T1‧‧‧first thickness
T2‧‧‧second thickness
50‧‧‧Clamp unit
51‧‧‧掣座
60‧‧‧ bearing
70‧‧‧First check valve
80‧‧‧Second check valve
90‧‧‧ gap

Other features and advantages of the present invention will be apparent from the embodiments of the present invention, wherein: Figure 1 is a cross-sectional view of an embodiment of a hydraulic collet having a leak stop oil ring of the present invention, illustrating 2 is a partially enlarged schematic view of FIG. 1; FIG. 3 is a partially enlarged schematic view of FIG. 2; FIG. 4 is a schematic view of the operation of the embodiment, illustrating that a collet unit is driven by pressurized oil during shutdown FIG. 5 is a partially enlarged schematic view of FIG. 4; FIG. 6 is another schematic view of the operation of the embodiment, illustrating that the collet unit is driven by the pressurized oil during the shutdown to tighten the workpiece; Figure 7 is a partially enlarged schematic view of Figure 6.

Claims (8)

A hydraulic collet having a leakage preventing oil ring for holding at least one workpiece, the hydraulic collet comprising: a base; a shaft seat mounted inside the base and having a first side; a rotating shaft a unit extending along an axis and rotatably axially disposed inside the shaft seat and having a second side opposite to the first side, wherein a flow of oil is formed between the first side and the second side a plurality of oil leakage preventing rings disposed between the first side surface and the second side surface and each having a base wall extending across the slit and extending from the first side surface to the second side surface a first ring wall of one side of the base wall and fixed to the shaft seat, a second ring wall connected to the other side of the base wall and adjacent to the rotating shaft unit, the base wall, the first ring wall and the The second annular wall collectively defines an oil groove that can communicate with the gap. When the machine is stopped, the pressure oil that is drained to the oil grooves along the gap can sway the second ring wall to oscillate relative to the first ring walls. And the oil tightly resists the shaft unit; and a collet unit is sleeved on the shaft Inside, driven by the pressure oil can be tightened or released by the workpiece. The hydraulic collet of claim 1, wherein the shaft seat further has a first oil inlet hole communicating with the first side surface and a first oil inlet hole staggered from the first oil inlet hole. a second oil inlet hole, the shaft unit further includes a main body and a driving wheel seat fixed to one side of the main body, and a cylinder chamber is formed between the main body and the driving wheel base, and the second side is disposed on the main body The main body further has a first oil guiding passage connected between the first oil inlet hole and the cylinder chamber, and a first oil guiding passage offset from the first oil guiding passage and communicating with the second oil inlet hole and the cylinder chamber A second oil guiding passage between the first oil guiding passage and the second oil guiding passage communicates with a port of the cylinder chamber on opposite sides of the cylinder chamber corresponding to the axis. A hydraulic collet having a leakage preventing oil ring according to claim 2, wherein a leak stopping oil ring is installed on each side of the first oil guiding passage, and on both sides of the second oil guiding passage Installed with a leak stop oil ring. A hydraulic collet having a leakage preventing oil ring according to claim 3, wherein the two leak stopping oil rings located between the first oil guiding passage and the second oil guiding passage are integrally connected. A hydraulic collet having a leakage preventing oil ring according to claim 4, wherein the first side of the shaft seat and the second side of the shaft unit respectively extend in a radial direction perpendicular to the axis, the shaft seat And a plurality of first recesses recessed from the first side surface and respectively located at two sides of the first oil inlet hole and the second oil inlet hole, and the first oil inlet hole and the second oil inlet hole The two first recesses are in communication with each other, and the first ring walls of the oil leakage preventing ring are respectively embedded in the first recesses, and the main body of the rotating shaft unit further has a recessed by the second side. a second groove located on both sides of the first oil guiding channel and the two sides of the second oil guiding channel, and two second grooves located between the first oil guiding channel and the second oil guiding channel are connected to each other The second annular walls of the oil leakage preventing ring are respectively sleeved in the second concave grooves, and the second concave grooves are respectively defined by a groove bottom surface and a groove side surface which intersects the bottom surface of the groove. The second annular wall of the oil leakage preventing ring has a width corresponding to a radial width smaller than a width of the corresponding second concave groove, and the second annular wall is subjected to the pressure oil The movement may respectively generate a wobble in the second grooves, and the second ring walls may be oil-tightly abutted against the corresponding groove sides. The hydraulic collet having the oil leakage preventing ring according to claim 5, further comprising a first check valve installed inside the main body of the rotating shaft unit and mounted on the first oil guiding passage, the first non-reverse valve The valve allows the pressure oil to be unidirectionally guided from the first oil inlet hole toward the cylinder chamber, and prevents the pressure oil of the cylinder chamber from flowing back toward the first oil inlet hole. The hydraulic collet having the oil leakage preventing ring according to claim 6, further comprising a second check valve installed inside the main body of the rotating shaft unit and mounted on the second oil guiding passage, the second non-reverse valve The valve allows the pressure oil to be unidirectionally guided from the second oil inlet port to the cylinder chamber, and prevents the pressure oil of the cylinder chamber from flowing back toward the second oil inlet hole. The hydraulic collet having a leak stop oil ring according to any one of claims 1 to 7, wherein the first ring wall of the oil leakage preventing ring is perpendicular to a first thickness of the radial direction is greater than The second annular wall is perpendicular to a second thickness of the radial direction.