JPH05296252A - Hydraulic fixed flange - Google Patents

Abstract

PURPOSE:To provide a hydraulic fixed flange which can surely be fixed without tilting a flange main body relative to a coupling member. CONSTITUTION:Two hydraulic chambers 13a, 13b are formed along a fitting surface 2 inside a flange main body 1 and are communicated to a filler port 5 by respective oil feed lines 11a, 11b. Operating oil O in the filler port 5 is compressed by a plunger 8 so that the hydraulic pressures within the filler port 5 and the hydraulic chambers 13a, 13b are built up. As the hydraulic pressures are built up, wall portions 14a, 14b are deflected and equally deformed and the fitting surface 2 makes contact with the outer peripheral surface 31a of an output shaft 31 so that a pressing force is at a maximum in each of two positions along an axis L.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic fixing flange for connecting a rotary tool such as a rotary knife or a milling cutter to an output shaft of a machine tool or the like.

[0002]

2. Description of the Related Art FIG. 7 is an axial sectional view showing an example of a conventional hydraulic fixing flange.

The inner diameter of the fitting surface 2 is 1 for the output shaft 31 of the machine tool.
The flange main body is set to be larger than the diameter by a predetermined length, and an annular hydraulic chamber 3 centered on the axis L is disposed in the flange main body 1 close to the fitting surface 2. A wall portion 4 having a predetermined thickness is formed between the hydraulic chamber 3 and the fitting surface 2.

Further, the flange body 1 is provided with the hydraulic chamber 3
And the lubrication port 5 is formed in the radial direction,
The hydraulic chamber 3 and the oil supply port 5 are sealed by a screw 7 screwed into the screw hole 6.

A hydraulic oil O, which is a pressurizing medium, is enclosed in the hydraulic chamber 3 and the oil inlet 5, and the hydraulic oil O is supplied by a plunger 8 fixed to the tip of the screw 7 by screwing in the screw 7. By being compressed, or from the outside, a high-pressure hydraulic oil O is supplied to an oil supply unit including a check valve (not shown) or the like.
Is supplied, the pressure in the hydraulic chamber 3 and the oil filling port 5 rises.

Further, the end surface of the flange body 1 has an axis L
And a step portion 9 is formed concentrically with the rotary tool 32 fixed to the step portion 9 with a bolt 10.

To fix the hydraulic fixing flange constructed as described above to the output shaft 31, as shown in FIG.
Fit the mating surface 2 of the flange body 1 to 31 and then screw 7
By screwing in to increase the pressure of the hydraulic oil O in the hydraulic chamber 3, the wall portion 4 swells inward, and the fitting surface 2 becomes the output shaft.
The flange main body 1 is fixed to the output shaft 31 by closely contacting with the outer peripheral surface 31a of 31.

[0008]

However, in the hydraulic fixing flange having the above structure, when the pressure in the hydraulic chamber 3 is increased, the fitting surface 2 is deformed most at the central portion in the axis L direction. Therefore, the fitting surface 2 is the outer peripheral surface of the output shaft 31.
The force acting on 31a is not uniform, and the axis L of the mating surface 2
The force distribution is such that the central portion in the direction is the apex and gradually decreases toward both ends of the hydraulic chamber 3. Therefore, as shown in FIG. 8, the fixed state of the flange body 1 in the K direction becomes unstable, and the runout of the rotary tool 32 in the A direction becomes large.

In order to solve the above problems, it is an object of the present invention to provide a hydraulic fixing flange which can be securely fixed to the connecting shaft without tilting the flange main body.

[0010]

In order to solve the above-mentioned problems, the present invention has a coaxial structure with a fitting surface of a flange main body fitted to a connecting shaft, through a wall having a predetermined thickness, and being coaxial with the fitting surface. A hydraulic fixing flange that has an annular hydraulic chamber, and bulges a wall between the fitting surface and the hydraulic chamber by supplying high-pressure hydraulic oil to the hydraulic chamber to fix the hydraulic shaft to the connecting shaft. A plurality of hydraulic chambers arranged at a predetermined interval in the axial direction of the flange body, an oil supply passage commonly communicating with the plurality of hydraulic chambers, and hydraulic oil filled in the hydraulic chamber and the oil supply passage. And means for holding the pressure of.

In addition, there is an annular hydraulic chamber coaxial with the fitting surface of the flange main body fitted to the connecting shaft through a wall having a predetermined thickness, and a high pressure operation is performed in the hydraulic chamber. In a hydraulic fixing flange that bulges a wall between the fitting surface and the hydraulic chamber by supplying oil to fix the connecting shaft,
In the hydraulic chamber, the wall thickness between the fitting surface is thin near both ends in the axial direction of the flange main body, and the wall thickness is thick near the central portion.

[0012]

According to the above-mentioned means, a plurality of hydraulic chambers arranged at a predetermined interval in the axial direction of the flange body, an oil supply passage commonly communicating with the plurality of hydraulic chambers, and the hydraulic chambers. And a means for holding the pressure of the hydraulic oil filled in the oil supply passage, the fitting surface can be bulged at a plurality of positions in the axial direction of the flange body,
Moreover, the amount of deformation of the fitting surface can be made equal at all bulging positions.

Further, since the wall thickness between the fitting surface is thin near both ends in the axial direction of the flange main body in the hydraulic chamber and the wall thickness is thick near the central portion, hydraulic oil is supplied to the hydraulic chamber. When supplied, the vicinity of both ends of the fitting surface can be preferentially expanded.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, members corresponding to the members described with reference to FIGS. 7 and 8 are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 1 is an axial sectional view showing a hydraulic pressure fixing flange which is a first embodiment of the present invention.

The hydraulic fixing flange of this embodiment is provided with two annular hydraulic chambers 13a and 13b in the flange body 1, and the hydraulic chambers 13a and 13b are symmetrical with respect to the flange body 1 at the center in the direction of the axis L. It is formed in a shape.

Since the hydraulic chamber 13a and the hydraulic chamber 13b are connected to the oil inlet 5 by the oil supply passage 11a and the oil supply passage 11b, respectively, the pressure of the hydraulic oil O in the oil inlet 5 and the oil passages 11a and 11b is It is always in a uniform state.

When the fitting surface 2 of the hydraulic fixing flange configured as described above is fitted to the output shaft 31 and the pressure of the hydraulic oil O in the oil filling port 5 is increased, the hydraulic chambers 13a and 13b. The pressure in the inside also rises uniformly, and as shown in FIG. 2, the walls 14a and 14b between the hydraulic chambers 13a and 13b and the fitting surface 2 are deformed so as to bend as the pressure rises. Inflate inward.

Here, the flexural deformation of the walls 14a and 14b becomes maximum at the respective center positions of the hydraulic chambers 13a and 13b in the direction of the axis L. Therefore, the fitting surface 2 exerts the maximum pressing force on the outer peripheral surface 31a of the output shaft 31 in two positions in the direction of the axis L so as to be in close contact with the outer peripheral surface 31a. As a result, the hydraulic fixing flange is fixed to the output shaft 31.

Therefore, in the hydraulic fixing flange configured as described above, the fitting surface 2 is the outer peripheral surface of the output shaft 31.
Since the maximum pressing force is applied to 31a at the two positions, the fixed state in the K direction shown in FIG. 2 is ensured, and the runout of the rotary tool 32 in the A direction can be reduced. Also,
Since the wall portion 14a and the wall portion 14b are deformed so as to be evenly bent when pressed and closely contact the outer peripheral surface 31a, the hydraulic fixing flange can be fixed to the output shaft 31 without always inclining. As a result, the rotary tool 32 is also fixed to the output shaft 31 without tilting, and the rotary tool 32 is fixed after the hydraulic fixing flange is fixed.
The work of adjusting the angles of 32 can be omitted or simplified.

FIG. 3 is an axial sectional view showing the structure of the second embodiment of the present invention.

In the hydraulic chamber 23, in order to reduce the wall thickness of the wall portions 24a, 24b near the both ends in the direction of the axis L to the fitting surface 2, the both end portions are wide in the radial direction and the wall near the center portion. In order to increase the wall thickness of the portion 24c, the vicinity of the central portion is formed to be narrow in the radial direction.

Since the wall portions 24a and 24b are thinner than the wall portion 24c up to the fitting surface 2, they are preferentially deformed when the pressure in the hydraulic chamber 23 is gradually increased.

FIG. 4, FIG. 5 and FIG. 6 are explanatory views when the pressure in the hydraulic chamber rises in the second embodiment.

FIG. 4 shows a state before the hydraulic oil O in the hydraulic chamber 23 is pressurized, and the walls 24a, 24b and 24c are not deformed.

FIG. 5 shows a state in which the pressure of the hydraulic oil O in the hydraulic chamber 23 is raised to a constant value, and the wall portion 24a
And the wall portion 24b are deformed so as to be evenly bent. At this time, since the fitting surface 2 exerts the maximum pressing force on the outer peripheral surface 31a of the output shaft 31 at the two positions in the axial line L direction, and the wall portion 24a and the wall. Since the portion 24b is uniformly deformed, it is stably fixed to the output shaft 31 without being inclined.

FIG. 6 shows a state in which the pressure of the hydraulic oil O in the hydraulic chamber 23 is further increased from the state shown in FIG. 5 to a predetermined operating pressure. By increasing the pressure of the hydraulic oil O in the hydraulic chamber 23 to the operating pressure, the outer peripheral surface at low pressure
Since the wall portion 24c that is not in pressure contact with 31a is deformed, as a result, the fitting surface 2 at the position facing the hydraulic chamber 23 has an outer peripheral surface 31
It comes into surface contact with a. Since the fitting surface 2 of the hydraulic fixing flange is fixed in contact with the outer peripheral surface 31a in a fixed state in the K direction, the runout of the rotary tool 32 in the A direction can be reduced, and the output shaft can be further reduced. Since the hydraulic fixing flange is fixed with respect to 31 without tilting, the work of adjusting the angle with respect to the output shaft 31 of the rotary tool 32 can be omitted or simplified.

[0028]

As described above, according to the present invention,
A plurality of hydraulic chambers arranged at a predetermined interval in the axial direction of the flange body, an oil supply passage commonly communicating with the plurality of hydraulic chambers, and hydraulic oil filled in the hydraulic chamber and the oil supply passage. By including the means for holding the pressure of, the fitting surface can be bulged at a plurality of positions in the axial direction of the flange body, and the deformation amount of the fitting surface at all bulging positions can be reduced. Since they can be made equal, the hydraulic fixing flange can be securely fixed to the connecting shaft without tilting, and the wall thickness between the fitting surface is thin near both ends of the hydraulic chamber in the axial direction of the flange body. Since the wall thickness is thicker near the central portion, when the hydraulic oil is supplied to the hydraulic chamber, the vicinity of both ends of the fitting surface can be preferentially bulged. When the specified hydraulic pressure is applied to the connecting shaft To be fixed without tilting the hydraulic flange by near both ends of the mating surfaces can be more securely fixed to the hydraulic fixing flange mating surface facing the hydraulic chamber is a surface contact state when the boosted.

[Brief description of drawings]

FIG. 1 is an axial sectional view showing a configuration of a first embodiment of the present invention.

FIG. 2 is an explanatory diagram when the pressure in the hydraulic chamber rises in the first embodiment.

FIG. 3 is an axial sectional view showing the configuration of a second embodiment of the present invention.

FIG. 4 is an explanatory diagram when the pressure in the hydraulic chamber rises in the second embodiment.

FIG. 5 is an explanatory diagram when the pressure in the hydraulic chamber rises in the second embodiment.

FIG. 6 is an explanatory diagram when the pressure in the hydraulic chamber rises in the second embodiment.

FIG. 7 is an axial sectional view showing an example of a conventional hydraulic fixing flange.

8 is an explanatory view when the pressure of the hydraulic chamber in the hydraulic fixing flange shown in FIG. 7 rises.

[Explanation of symbols]

1 ... Flange body, 2 ... Mating surface, 5 ... Lubrication port, 11
a, 11b ... Oil supply path, 13a, 13b ... Hydraulic chamber, 14a, 14b ... Wall part, 23 ... Hydraulic chamber, 24a, 24b, 24c ... Wall part, 31 ... Output shaft, 31a ... Outer peripheral surface, O ... Hydraulic oil ..

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinji Yamamoto 3-10-10 Tsukiji, Chuo-ku, Tokyo In-house company Nakamura (72) Inventor Hiroji Susa 3-10-10 Tsukiji, Chuo-ku, Tokyo No. Incorporated Nakamura In-house (72) Inventor Mikiya Nose 3-10-10 Tsukiji, Chuo-ku, Tokyo In-house Nakamura In-house

Claims (2)

[Claims] 1. An annular hydraulic chamber coaxial with the fitting surface of a flange main body fitted to a connecting shaft via a wall having a predetermined thickness, and a high pressure operation in the hydraulic chamber. A hydraulic fixing flange that bulges a wall between the fitting surface and the hydraulic chamber by supplying oil to fix the hydraulic shaft to the connecting shaft, the hydraulic fixing flanges being arranged at predetermined intervals in the axial direction of the flange body. A plurality of hydraulic chambers, an oil supply passage that communicates with the plurality of hydraulic chambers in common, and means for holding the pressure of the hydraulic oil filled in the hydraulic chambers and the oil supply passage. Hydraulic fixed flange to do. 2. An annular hydraulic chamber coaxial with the fitting surface of a flange body fitted to the connecting shaft through a wall having a predetermined thickness from the fitting surface, and the hydraulic chamber operates at high pressure. A hydraulic fixing flange for bulging a wall between the fitting surface and the hydraulic chamber to fix the connecting shaft by supplying oil, wherein the fitting is provided near both ends of the hydraulic chamber in the axial direction of the flange main body. A hydraulic fixing flange characterized in that the wall thickness between the surface and the surface is thin, and the wall thickness is thicker near the central portion.