JPS58160027A - Hydraulic fitting and detaching device for cylindrical member - Google Patents

Abstract

PURPOSE:To make it easy to fit and detach a cylindrical member to and form a shaft by a method wherein in case the cylindrical member having different outer diameters and a tapered inner peripheral surface is fitted to, and detached from the shaft, a piston is received within an oil inlet hole in the shaft through a spring and the pressure of oil applied to the cylindrical member fitting sections is varied in proportion to the variation of the outer diameter of the cylindrical member. CONSTITUTION:When the engaging section Aa of a cylindrical member 1 is drawn out from the shaft, a piston 6 is at first brought into contact with the end surface 3a of an oil inlet hole 3 by means of a spring 7 and the pressure oil from an oil hole 13 enters oil grooves 4a and 4b via oil passages 5a and 5b, compress the engaging section A on the inner peripheral surfaces of a large diametered section 1a and a small diametered section 1b of the cylindrical member 1. Thus, when the pressure reaches a value Pb which is high enough to expand the engaging section Ab of the small diametered section of the cylindrical member 1, the piston 6 is moved to the right by a force exerted in the axial direction due to the existence of a notch 9 to thereby interrupt an oil hole 10 and an oil passage 5b, but the oil pressure Pb does not decrease due to interference at the engaging end Ac of the cylindrical member. Then, when the pressure of oil increases up to a value Pa required for enabling the engaging section Aa of the large diametered section of the cylindrical member 1 to be drawn out, it is possible to draw out the member 1 easily from the shaft 2. On the contrary, when inserting the engaging section Aa, an insertion jig is used for inserting it up to the specified position on the basis of the above movements.

Description

[Detailed Description of the Invention] Hydraulic fitting and dismounting device for a cylindrical body, which uses hydraulic pressure to fit and disengage a cylindrical body having an uneven outer diameter, a tapered inner diameter, and a long fitting part onto a shaft. It is related to.

An example of a conventional hydraulic fitting/uncoupling device of this type will be explained with reference to FIGS. This is a relatively short case. That is, an oil introduction hole 3 is provided in the longitudinal direction of the shaft 2, an oil passage 5 provided in the radial direction is connected to this oil introduction hole 3, and this oil passage 5 is provided on the outer peripheral surface of the fitting part A of the shaft 2. High-pressure oil is introduced from the oil introduction hole 3, and further flows into the oil groove 4 through the oil passage 5 to coat the inner circumferential surface of the cylindrical body 1 of the fitting part A. Apply pressure.

When high-pressure oil is applied to the fitting surface A of the cylindrical body 1' which is fitted with a predetermined interference as described above, the cylindrical body 1' is fitted into the oil groove 4 as shown in FIG. The neighboring portion Y't- is enlarged, and the cylindrical body 1' expands non-uniformly in the longitudinal direction, leaving an interference margin at the inner fitting end X. When the oil pressure is further increased, the interference is eliminated over the entire surface of the fitting portion, causing a phenomenon in which oil leaks from the edge of the inner fitting end X.

However, as mentioned above, the axial component force is generated in the cylindrical body 1' due to the taper, so in the state where an interference is left at the tightly fitted end X of the cylindrical body 1', that is, in the state before oil leakage occurs. , due to the relative relationship between the residual interference and the axial component force, the axial component force is larger than the residual interference, so the cylindrical body 1
' separates from axis 2.

In the above-mentioned conventional example, when the fitting part A'il is long, the solid fitting end X, which is not affected by the expansion of the inner peripheral part due to hydraulic pressure, becomes long, and the relative balance with the axial component force is maintained. Since it becomes impossible to maintain the shaft 2 when pushing in and pulling out,
Also, there is a risk of damage to the fitting surface of the cylindrical body 1'. In addition, in order to improve workability without damaging the shaft 2 and the cylindrical body 1', it is necessary to use hydraulic pressure. Since it has to be raised more than necessary, there is a risk that the fitting end of the cylindrical body l' will yield due to the excessive rise in oil pressure.

In order to completely prevent such defects, the fitting part A of the shaft 2 should be adjusted so that the cylindrical body 1' having the long fitting part Ai is expanded relatively uniformly over its entire length as shown in FIG. An arbitrary number of oil grooves 4 may be provided on the outer peripheral surface of the oil groove 4, and these oil grooves 4 may be configured to communicate with the axial hydraulic pressure introduction hole 3 via a radial oil passage 5.

However, even with the above configuration, if the cylindrical body 1 has an uneven shape with large and small outer diameters 1a and lb as shown in FIG. 4, the stress generated in the cylindrical body 1 will be Since it becomes non-uniform depending on the shape, the expansion of the inner peripheral portion is also non-uniform.

That is, before the fitting portion Aa of the large outer diameter portion 1a expands,
Since the fitting portion Ab of the small outer diameter portion 1b is completely expanded, oil leaks from this fitting portion Ab. For this reason, it is not possible to further increase the oil pressure, and therefore it is impossible to enlarge the large outer diameter portion 1ay by the required amount, so there is a drawback that it is difficult to separate the cylindrical body 1 from the entire axis 2.

In view of the above, the present invention uniformly expands the long fitting part of a cylindrical body with uneven outer diameter, and prevents oil leakage due to yielding of the fitting part end due to excessive hydraulic pressure and expansion of the fitting part end. The piston is housed in a hydraulic pressure introduction hole provided in the longitudinal direction of the shaft via a spring and a spring holder, and the fitting part is adjusted in response to changes in the outer diameter of the cylindrical body. The feature is that different hydraulic pressures are applied to each.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 5, reference numeral 1 denotes a cylindrical body having an outer diameter of a large diameter portion 1a and a small diameter portion 1b, and this cylindrical body 1 is fitted onto a shaft 2 through a fitting portion. Reference numeral 3 denotes an oil pressure introduction hole provided in the axial direction at the center of the shaft 2, and a piston 6 is accommodated in the oil introduction hole 3 via a spring 7 and an adjustable spring retainer 8. 4a and 4b' are oil grooves provided in an arbitrary number on the outer peripheral surface of the shaft 2; 5 is an oil passage provided in the radial direction of the shaft 2 and communicates the oil groove 4 with the oil introduction hole 3; 9 is a piston 6; 10 is an oil hole provided in the radial direction of the piston 6, 11.12 is an oil leakage prevention hole embedded in the outer circumferential surface of the piston 6 and the outer circumferential surface of the spring retainer 8, respectively.
1J and 13 are oil holes provided in the spring presser 8 in the axial direction.

Next, the operation of this embodiment configured as described above will be explained.

In the initial state, the end surface of the piston 6 is joined to the end surface 3a of the oil introduction hole 3, and the spring 7 has a predetermined spring force by adjusting the spring presser 8. Pressure oil is introduced from the oil hole 13 of the spring holder 8 into the oil introduction hole 3 of the shaft 2, and further through the oil passages 5a and 5b.
i through oil groove 4a.

4b, the large diameter portion 1a and the small diameter portion 1b of the cylindrical body 1
Inner peripheral surface fitting part A? While applying pressure, the notch 9 of the piston 6 generates an axial force on the piston 6.

Then, in a state where the oil pressure has increased to an appropriate pressure for expanding the inner peripheral surface fitting portion Abi of the small diameter portion 1b of the cylindrical body, the force in the axial direction of the piston 6 is set to be υ larger than the force of the spring 7.
By adjusting the dimensions of the notch 90 of the piston 6 and the force of the spring 7, the piston moves toward the spring 7 as shown in FIG. 6 when the oil pressure in the fitting portion Ab reaches pb. Therefore, the oil hole 10 of the piston 6 and the oil passage 5b of the shaft 2
communication is cut off.

The hydraulic pressure pb is determined by the relative relationship with the axial extraction force due to the taper of the inner cylindrical surface of the cylindrical body 1, since there is no pressure that causes the small diameter portion 1b't of the cylindrical body to expand across the entire surface. The fitting end portion Ac still has a residual tightening margin. Therefore, even if the oil passage 5b of the shaft 20 is blocked by the piston 6, oil will not leak from the fitting end Ac, so there is no fear that the oil pressure pb in the oil passage 5b will decrease.

The oil pressure is further increased from the above state, and the large diameter portion 1a of the cylindrical body is
When the fitting part Aa (i7) is increased with a pressure Pa1 that is designed to be pulled out, the cylindrical body 1'i can be easily pulled out from the shaft 2 due to the relationship between the residual interference as a whole and the component force in the pullout direction. becomes.

In the above-mentioned embodiment, the case where the cylindrical body 1 is pulled out from the shaft 2 will be explained, and when t is pushed in, a separately provided pushing jig is also used and the cylindrical body 1 is pulled out to a predetermined value according to the above operation. Just push it in.

As explained above, according to the present invention, the hydraulic pressure applied to the inner fitting portion of a cylindrical body having an uneven outer diameter is changed in accordance with the outer diameter, thereby making it possible to control the fitting end portion. Oil leakage due to expansion and yielding of the fitting end due to excessive hydraulic pressure are prevented, and cylindrical bodies with uneven outer diameters can be easily hydraulically fitted and removed.

[Brief explanation of drawings]

Figures 1 and 2 are a sectional view and a pressurized state diagram of a conventional hydraulic fitting device for a cylindrical body with a uniform outer diameter, and Figures 3 and 4 are
The figure shows a sectional view and a pressurized state diagram of a conventional hydraulic fitting device for a cylindrical body with uneven outer diameter, and FIGS. 5 and 6 show an initial assembly of an embodiment of the hydraulic fitting device for a cylindrical body of the present invention. FIG. 1... Cylindrical body% 1a... Large diameter part, 1b... Small diameter part, 2... Shaft, 3... Oil introduction hole, 5a, 5b... Oil passage, 6... Piston , 7... Spring, 8... Spring holder, A... Fitting part. Figure 1 Figure 2 Figure 1' ■ 3 Figure 'fJ/! L diagram ■ 5 Figure 1 VJ 6 Go to Figure 4. -1:-

Claims (1)

[Scope of Claims] 1. A cylindrical body with an uneven outer diameter, a curved inner diameter, and a long fitting portion, with a radius that communicates with an oil introduction hole provided in the longitudinal direction of the shaft. In a hydraulic fitting/disassembly device configured to be fitted to/disconnected from a shaft by hydraulic pressure from an arbitrary number of oil passages in a direction, a piston is housed in the oil introduction hole via a spring and a spring retainer, and the cylindrical body A hydraulic fitting/disconnecting device for a cylindrical body, which is characterized in that a different hydraulic pressure is applied to each fitting part in response to changes in the outer diameter of the cylinder. 2. The hydraulic fitting and dismounting device for a cylindrical body as set forth in claim 1, wherein adjustment is made possible by a perfect spring presser of the spring.