JPS6014648B2 - hydraulic tightening device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hydraulic tensioning device, and more particularly to a tensioning device for tightening a mechanical component by pressing a fixed stopper of the mandrel against a fixed stopper in the direction of the plow line.

[Prior Art and Problems to be Solved by the Invention] Conventionally, the bonito body has an annular bell body which can be fixedly attached in the marlin direction to a mandrel into which mechanical parts are inserted, and at least one bell body is provided in the bonito body.
a pressure chamber and an annular surge chamber extending through the pressure chamber, and a stop screwed into the pressure chamber so that the hydraulic pressure in the pressure chamber can be adjusted by tightening and returning the stop. It is equipped with a screw and a tightening member that has an annular piston that is iron-fitted with the surge chamber and is movable in the axial direction. By screwing the set screw into the pressure chamber, the tightening member is pushed out from the bamboo body and the machine A hydraulic tightening device is known in which a component is tightened by being pressed against a fixed stopper piece of a D rod in the direction of the wire.

A known example of such a tensioning device is one in which the pressure chamber is formed so that its marking line extends parallel to the key line of the casing, and the set screws are operated from both ends of the tensioning device. be.

However, in this known example, the tightening device has a large dimension in the wisteria line direction, and can only be used at the end of the mandrel. When tightening a plurality of machine parts, there is a disadvantage that it cannot be used at an intermediate position between the parts to be tightened. Additionally, if peripheral space is limited, it is often difficult or impossible to operate the set screw from the end side of the tightening device. Another known example is one in which the pressure chamber is formed such that its axis extends in the radial direction of the weight, and a set screw is screwed into the pressure chamber from the radial direction of the tightening device.

However, this known example has the disadvantage of increasing the radial dimensions of the tensioning device. Therefore, it is unsuitable for tightening mechanical parts to a mandrel when peripheral space is limited, for example, for tightening a hob to a hob shaft of a hobbing machine. The present invention is intended to solve the above problems, that is, to provide a tightening device that is extremely small in size both in the inguinal direction and in the radial direction, and can therefore be used even in narrow spaces.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a hydraulic constriction device as described at the beginning, in which the pressure chamber is configured such that its line of travel forms a chord with respect to the circumference of the patient. .

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 is a cross-sectional view taken along line 1--1 of FIG. 2 of a tightening device according to the invention, and FIG. 2 is a partially sectional side view taken along line 2--2 of FIG.

The tightening device has a rotationally symmetrical, substantially cylindrical body 1 with an annular portion 2 and a hub portion 3 . The cliff body 1 has a central inner hole 4 extending in the direction of the vehicle, and an inner thread 5 is formed in the center inner hole 4. The tightening device is fixedly attached to the spindle or mandrel 22 of a machine such as a grinding machine or a hobbing machine in the direction of the fly line by screwing the weight body 1 onto the threaded shaft 6 of the machine. However, the inner hole 4 of the crab body 1 does not necessarily have to be threaded. In this case, a tightening device is inserted into the spindle or mandrel of the machine as described above, for example, between two spacing rings, and pushed into the desired position, and a retaining member, such as a nut, is attached to the spindle or mandrel. Inside the annular portion 2 of the screen body 1, a plurality of chambers are formed in which the koji line extends in the radial plane of the screen body and is offset from each other by an arbitrary angle.

One of the chambers acts as a pressure display section 32, and the other chamber acts as a pressure chamber 7. These chambers are formed as cylindrical holes, and their ruts do not extend in the radial direction of the crab body 1 as shown in FIG.
It is constructed to form a chord with respect to the circumference of. A set screw 8 having a hexagonal hole is screwed into the pressure chamber 7 from the outside in the direction of the spiral. A spherical projection 9 is provided at the inner end of the set screw 8, and this projection cooperates with a piston 11 which is movable in the pressure chamber 7 in the horizontal direction. The inner end of the piston 11 is maintained in a sealed relationship with the inner wall surface of the pressure chamber 7 by a seal 12 . A pressure display section 32 is also provided in the annular section 2 of the pupil body 1 in the same manner as the pressure chamber 7, and is closed off from the outside by a screw plug 28'.

The display pin 25, which is movable in the axial direction, can be hidden so as to be flush with the screw plug 28 when there is no load, that is, no pressure. The indicator pin 25 is connected to a piston 31, which cooperates with a second movable piston 30. The inner end of the second piston 30 is maintained in a sealed relationship with the inner wall surface of the pressure indicator 32 by a seal 26 . A spring assembly 29 is provided on the outer end surface of the piston 31 to move the indicator pin 25 in the axial direction against hydraulic pressure. The hollow chambers 13 and 27 of the pressure chamber 7 and the pressure indicator 32 located inside the seals 12 and 26, respectively, are connected via a passage 14 extending within the lotus body 1 approximately in the axial direction thereof. The hollow chamber 15 of the annular surge chamber 16, which is composed of an annular groove 17, is compatible with the hollow chamber 15 of the annular surge chamber 16.

An annular piston 19 is fitted in this hollow chamber 15,
The piston is sealed by an annular seal piece 18 that is in contact with the piston. The annular piston 19 is movable in the axial direction within the annular surge chamber 16 together with the seal piece 18, and its free end projects outward from the flute body 1 in the axial direction.
As is clear from FIG. 2, the pressure chamber 7 and the surge chamber 16
are located one after the other or next to each other in the direction of the flywheel in substantially the same radial plane of the tightening device.

The hollow chambers 13, 27 and 15 and the passage 14 which communicates these hollow chambers are filled with a hydraulic medium. When the set screw 8 is tightened into the pressure chamber 7, that is, when the piston 11 is pushed in, pressure acts on the seal piece 18, that is, the annular piston 19, through the hydraulic medium, and this moves from the bell body 1 to the right side in FIG. being pushed in the direction As a result, as is clear from FIG.
For example, a hop 23, which is fitted with an iron into the shaft 22 of a hobbing machine so as to be movable in the direction of the marking line, is pressed. The annular piston 19 thus serves as a tensioning member. The pressing force of the annular piston 19 can be adjusted by adjusting the screwing depth of the set screw 8 into the pressure chamber 7. Incidentally, all setscrews 8 may be tightened, but since the hollow chamber 13 of the pressure chamber 7 is flush with each other via the passage 14 and the hollow chamber 15, it is sufficient to tighten only one set screw. . Also, the number of pressure chambers may be greater or less than in the illustrated embodiment. When the set screw 8 is tightened into the pressure chamber 7, that is, when the piston 11 is pushed together with the sealing piece 12, pressure is applied to the sealing piece 18 via the hydraulic medium, and as a result, a pressing force is applied via the annular piston 19. In addition to acting on the mechanical part (hob) 23 to be tightened, the lotus passage 1
4 on the seal 26 in the pressure indicator 32 and thus also on the piston 30 and the piston 31 which is connected to the indicator pin 25. This force causes the indicator pin 25 to move axially against the force of the spring assembly 29, thus compressing the spring assembly. The hydraulic pressure at this time is
It can be read from a gauge ring 33 attached to the indicator pin 25 or provided in a hole in the screw plug 28. When the pressure drops,
The action of the spring assembly 29 causes the piston 31 to move toward the indicator pin 2.
5 and the seal 26 are pushed back to the original position. Therefore, the annular piston 19 relative to the part to be tightened (hob) 23
The desired pressing force can be adjusted and monitored by means of a gauge ring 33 provided on the indicator pin 25 or on the screw plug 28. When using the tightening device described above, the hob 23 is inserted into the mandrel 22 together with the smoothing ring and pressed against the fixed stopper piece (not shown) on the right side of the mandrel, and then the tensioning device is screwed onto the screw shaft 6. and tighten the hob 23 until there is no play between the fixed stopper piece and the tightening device. In order to securely screw the tightening device onto the screw shaft portion 6, a radial hole 24 is provided in the cliff body 1 of the tightening device, into which a rotary tool can be hung. After the tightening device is screwed in this manner, the set screw 8 is tightened to force the annular piston 19, which is a tightening member, against the hob 23. This pressing force acts symmetrically on the hob. Thereby, the hob 23 can be securely attached to the shaft 22, and there is no need to use a handle, an adjustment key, or the like. In addition, the large play of the annular piston compensates for small deviations of the spacing ring, resulting in higher accuracy and longer service life of the hob. Also, the hob is tightened only by pure force in the direction of the sea bream line. [Effects of the Invention] In the tightening device of the present invention, the pressure chamber 7 and the surge chamber 16 are arranged one after the other in the axial direction and close to each other, and the pressure chamber 7 and the pressure display section 32 are Since the wire is configured to form a chord of the weight body 1, both the axial and radial dimensions of the tightening device can be reduced by 4 mm, and therefore it can be used even if the peripheral base is narrow.

[Brief explanation of the drawing]

1 is a cross-sectional view taken along line 1--1 in FIG. 2 of a vertical tensioning device according to the present invention, and FIG. 2 is a partially sectional side view taken along line 2--2 in FIG. 1. ．． ．． ．． ．．・Coating body, 7... Pressure chamber, 8...
...Set screw, 16...Surge chamber, 19...
...Annular piston (weave member), 22...
Mandrel, 23... Hob (strained mechanical part), 32
......Pressure display section. Fig. l Fig. 2

Claims (1)

[Scope of Claims] 1. It has an annular casing that can be fixedly attached in the axial direction to a mandrel into which a mechanical part is inserted, and has at least one pressure chamber inside the casing, and an annular casing that communicates with the pressure chamber. A surge chamber is formed, and a set screw is screwed into the pressure chamber so that the hydraulic pressure in the pressure chamber can be adjusted by tightening and returning the set screw, and an annular piston fitted into the surge chamber. and a tightening member movable in the axial direction, the hydraulic tightening device is configured to tighten the mechanical component by pressing the mechanical component against a fixed stopper of the mandrel in the axial direction, wherein the pressure chamber 7
A hydraulic tightening device characterized in that the axis thereof forms a chord with respect to the circumference of the casing 1. 2. The hydraulic tightening device according to claim 1, wherein the pressure display section 32 is formed on the casing 1 so that its axis forms a chord with respect to the circumference of the casing 1.