KR200262688Y1 - Bore Expansion Taper Bush - Google Patents

Abstract

The shape of the taper bush conventionally used is that the inner diameter of the bush is the inner diameter of the boss of the pulley body when one side of the tapered bush is cut by a cutter using a machine tool and assembled to the shaft using a tightening bolt. It is pushed apart and the shaft diameter is retracted so that it can be used for the pulley body, taper bush, and a convenient method of fixing together integrally to the shaft.

However, after cutting one side of the tapered bush with a cutter, which is the last manufacturing process in the manufacture of the tapered bush, as shown in Fig. 5 (1), which is a conventional tapered bush, the tapered bush which has been lathed in a garden shape is cut. Under the influence of

Since the entire inner and outer diameter of the bush is retracted inward, the inner diameter of the bush is deformed, and when the tapered bush made to fit the shaft diameter is assembled to the shaft diameter, the tapered bush is not inserted into the shaft diameter. Inserted into the groove cut by the hammer and hit with a hammer (Hammer) to open the inner diameter of the tapered bush to force the larger than the shaft diameter after the very uncomfortable and unreasonable work is required,

In the process of performing such assembly work, the inner diameter of the bush is excessively widened and the tapered bush itself is split and damaged, causing unusable work frequently, and the damage of the tapered bush causes waste of material and work time, inconvenience and excessive work. Because of this, safety accidents occurred frequently.

In particular, during the preventive maintenance, maintenance work, or replacement of the pulley, the removal of the shaft from the shaft or the use of the bearing puller forcibly removed from the shaft was required, and the driving shaft and the driven shaft were frequently damaged.

In places with poor use environment

It is difficult to remove the bush from the shaft due to the sticking of the drive shaft and the driven shaft and the tapered bush, which has been used for a long time, and the severe corrosion or oxidizing action. Alternatively, in the case of cutting, not only the taper bushing itself but also the shaft may be damaged.

However, the present invention is intended to solve and improve such an uncomfortable and unreasonable working method No. 1 right side view. Fig. 1 is a right side view of the tapered bush of the reference numeral (1). Drill the standard hole for tapping with a drill as shown in (6), and use taping manual tap No. 1 here. Only two rows of threads were processed to form a tapered female thread.

The first tapered female threaded portion formed in this way. Formed in reference numeral 1 of FIG. 1 by using one of two tapered bushing bolts for assembling the shaft, bush and pulley main body used in (2) and (5) together. Insert the tapered female screw and tighten the bolt to tighten the tapered thread formed by the tapered part using the tightening bolt formed only with the complete threaded portion. The inner diameter of the bush is expanded and expanded to be larger than the shaft outer diameter when assembled to the shaft.

The expanded tapered bush is easily inserted because its inner diameter is larger than the shaft diameter to be assembled on the desired axis, and it is precisely positioned at the desired position while smoothly sliding to the desired position on the axis.

When the tightening bolt which was used to extend the bush is pulled out again, the inner diameter of the bush is returned to its original position, and it is temporarily pre-assembled to the position for assembly work without moving from the axis position. (Pre-Fixing Work) It is possible to do the main assembly of the pulley on the tapered bush where the preassembled and fixed parts are fixed and easy and convenient. Inner-expansion tapered bush that allows assembly.

Description

Bore Expansion Taper Bush

The taper bush used to assemble the belt pulley used for the driving device and the driven device of rotating machines, and the taper bush of the belt pulley is conventionally the motor shaft diameter or the driven side. Although the inner diameter of the belt pulley in accordance with the shaft diameter has been processed by each dimension, it has been mainly used as a method of assembling by fitting according to the fitting specification and degree (Finished Bore Type).

In recent years, the specifications of pulleys and bushes have been mainly standardized and ready-made. It is widely used as a convenient advantage of assembling work because it purchases ready-made tapered bushes and uses them according to the shaft diameter compared to those formed as

However, in spite of the advantage that the tapered bush has an advantage in convenience, the present invention has been made to improve this, which is often followed by an unreasonable and irrational assembly method or disassembly method and breaks the taper bush.

The present invention is a tapered bush in which a tapered bush-coupled belt pulley coupled with a tapered bush is assembled to a motor shaft or a driven shaft on the driving side. . Equal diameter manual tap to drill holes and form female threads as shown in (6). 2. Using only the manual tap No. 1 in No. 3, tap to go to the second threaded part where the complete thread is formed through the taper part of No. 1 tap to form the tapered female thread part with the taper angle of the female thread, and here the complete thread part only. The internal diameter of the bush of the female threaded part is expanded by expanding the internal diameter of the bush of the female threaded part by inserting and tightening the formed male bolt and tightening the tapered part under the fully threaded part formed by tapping. It is designed to facilitate assembly work and to facilitate disassembly by expanding the inner diameter in the same way when removing and disassembling from the shaft. Conventional tapered bushes are as shown in Fig. 5 (1). After cutting by cutting only one side of the bush and using it only for the expansion and contraction action on the material Although the inner diameter of the bush is reduced and the inner diameter of the tapered bush is precisely machined according to the outer diameter, when the assembly is actually performed on the shaft, the inner diameter is retracted and the cut surface of the tapered bush is reduced. It is not only very inconvenient to use as it is assembled by forcibly opening the inner diameter of the bush by using

Since the inner diameter of the bush is forcibly opened, the outer diameter of the shaft and the inner diameter of the bush cannot be precisely spaced and uniformly fitted, and the bush itself does not maintain the garden and is deformed. During this work, the bush is frequently cut and broken. Of course, there were many problems with the desired assembly work.

In particular, in the case of tapered bushes that are made of cast iron and machined, they are forced to hit the tapered bushes with hammers against the shaft when the inner diameter is retracted. The work of forcibly opening the inner diameter with a driver, etc., caused the taper bush to be cut and damaged easily, resulting in a large amount of physical time loss and excessive safety work.

This unreasonable work is required because the bushing tolerance of the bushing against the outer diameter of the shaft has been set in the international standard for assembling by fitting. It was.

The standard for fitting the taper bush and shaft is to use clearance clearance regulation 1 and 2 as with ISO tolerance (ISO 286-1: 1988) shaft fitting method. The hub is H7, and the shaft h7 hub is based on H8 for the two-way fastening, and the allowable dimensions according to the tolerances are standardized as shown in the following table.

If the internal diameter of the tapered bush used for the shaft diameter 50mm corresponding to the shaft between 31mm and 50mm is applied to the Clearance 1 method, even if the maximum clearance inner diameter machining is processed to 50.025mm based on H7

When machining the tapered bush, if one side of the bush of the garden type, which is the last process, is cut, the state of the bush is not a garden but is transformed into an ellipse shape. Cast iron is 49.5mm to 49.7mm, less than 50mm,

When machining from carbon steel, the size is reduced to about 48.5mm to 49mm.

In order to assemble the reduced inner diameter of the bush to 50mm, the axial reference dimension, the inner diameter of the tapered bush was expanded by forcibly expanding the inner diameter of 50mm or more, so that an unreasonable assembling method that can only be assembled according to the shaft diameter has been mobilized.

In order to improve the inconvenience and unreasonable working method of assembly and disassembly of the conventional tapered bush and to perform the work with the newly designed tapered bush, it is designed for the elimination of wasteful human physical loss and safe work.

1 is a right side view of the tapered bush

2 is a front view of the tapered bush

3 is a left side view of the tapered bush

4 is a perspective view of a tapered bush. FIG. 5 is a right side view of a conventional tapered bush.

<Explanation of symbols on the main parts of the drawing>

1 is a symbol described in the right side view

(1): Cutting part of the bush which processes one side of the tapered bush with a cutter to facilitate the assembly of the bush.

(2) and (5): Screw tightening part used to attach the bush to the pulley. Female thread forming part that allows the shaft, bush and pulley to be assembled together integrally. 2 female threads required)

(3) No .: Separate female thread used to separate the bush from the pulley body

(4) No .: Grooving part that facilitates the expansion and contraction of the circular structure of the bush when assembling the bush on the shaft and pulley

(6): No. 1 right side view No. 1 right side (1) Tapered thread female thread forming part having the function of expanding the inner diameter of the tapered bush in the center of the cut surface of the bush (diameter tap 1 after drilling) Tapped using burn)

In the conventional tapered bush, there is no portion in which the tapered female threaded portion (6) of the right side view of FIG. 1 is attached, and only one cut surface of the tapered bush is used as shown in (5) of FIG. It has been used only with the expansion of the inner diameter using only the stretching of the limited material of the street.

However, when one side of the bush, which is the process of final processing of the tapered bush, is cut by the inner diameter of the bush, the inner diameter of the bush is retracted inward, and the inner diameter is greatly reduced. Also, the inner diameter of the bush was not transformed into a garden type.

In particular, almost all materials for tapered bushes are made of cast iron and cast using machine tools. Due to the characteristics of cast iron, the tapered bush is forced by wedge action using a tool such as a screwdriver or a chisel on the cutting surface to expand the inner diameter of the tapered bush. The tapered bush was easily cut and broken when hit with a throwing hammer.

However, the composition of the present invention

As shown in (1) of FIG. 1, the tapered female screw portion for extending the inner diameter of the bush is formed in the center of the bush cutting surface.

The construction method was drilled to fit the size of manual tapping on the tapered bush cut surface, and then machined up to the second screw part of the complete thread through the taper using the manual manual tap # 1.

The diameter specification of the female thread used for the inner diameter expansion type tapered bush is formed differently according to the size of the bush, but the method of forming the female thread part is processed by one of the following methods.

① Process the inner and outer diameters of the bush according to the axis to be applied.

② Drill the drill of the standard which can form the required female thread at the center of the position to cut one side of the bush. (6mm Tap = 5.1mm 8mm Tap = 6.8mm, 10mm Tap = 8.5mm, 12mm Tap = 10.2mm, 14mm Tap = 11.9mm, 16mm Tap = 13.6mm Drilling)

③ After drilling, tap the second thread to form the complete thread by tapping the tapered part of tap 1 by using the manual tap No. 1 to make the female thread forming part into tapered shape.

④ Cut one side of the bush after forming the tapered female thread.

⑤ Insert the tightening bolt into the tapered female thread forming part and tighten the taper bush from the third thread after the second thread.

Taper bushes where the female thread is tapered at the center of one side of the tapered bush using a bolt for tightening the male thread are used to tighten the tapered female thread forming part formed by tapping due to the turning of the bolt formed only by the full thread. The inner diameter of the bush will expand.

This method uses the principle of pushing the tapered female threaded part to the ridge part of the full threaded part by turning the male threaded bolt rather than the tapered shape to the place where the tapered female threaded thread is made. Detaching can be done very quickly and easily when adjusting the position or dismantling.

□ When assembling the pulley with tapered bushes on the shaft for the first time

The first reference numeral 1 of the accompanying drawings, the bolts (2) and (5) of the right side view, and the assembly bolts used when assembling the pulley main body and the shaft together using a bolt. The right side view of drawing No. 1 formed in the center of the cut surface of the tapered bush. Insert the bolt into the tapered female threaded part formed for the internal diameter expansion function in (6) and tighten the bolt by turning it about 3 turns using the tightening bolt of the tapered bush processed only with the complete threaded part.

At this time, the inner and outer diameters of the tapered bushes are expanded at the same time, so that the inner diameter of the bushes expands and expands laterally. In the extended position, slide the tapered bush pulley onto the axis. If it is necessary to further expand the inner diameter of the bush, turn the tightening bolt one or two more turns.

After the tapered bush is fitted with the sliding fit on the shaft, the assembly position adjustment on the axis is performed, and the tightening bolt used to extend the tapered bush is turned off.

When the assembly bolts are inserted into the female threads (2) and (5), which are formed for the assembly bolt assembly shown in the right side view of FIG. 1, the tightening operation according to the tightening torque is performed, the body of the bush and the pulley And the shafts are assembled together.

The taper bush has an inner diameter of between 31mm and 50mm

In case of using 10mm diameter bolt for expansion of inner diameter, the inner diameter of bush is expanded by + 50 / 1,000mm, which is larger than 25 / 1,000mm for H7 and 39 / 1,000mm for H8. G6, the clearance tolerance of the fitting value, clearance fit. It can be used for h7, and in this extended state, it is assembled as loose sliding feet, so that the tapered bushing pulley can be easily assembled to the shaft.

□ Remove pulley body and bush from pulley with taper bush pulley (for maintenance work or pulley replacement)

Fig. 1 Right side view Taper bush and pulley formed at No. (3) using one of the bolts removed after removing the assembling bolts assembled at Nos. (2) and (5) The pulley body and the tapered bush are separated by inserting it into the female thread forming part which serves to separate the main body and turning it clockwise.

But the bush is still assembled to the shaft. At this time, reference numeral 1, reference numeral (1) in the center of the bush cutting surface tapered female thread forming portion formed for the internal diameter expansion function (6) for the tapered bush and pulley body assembly (2) and (5) If one of the bolts used at the same time is used to insert the tapered female screw part and turn about 2-3 turns, the inner diameter of the tapered bush is expanded and the inner diameter is expanded so that it can be easily removed from the shaft.

Claims (1)

Fig. 1 is a right side view of the tapered bush for assembling and removing the tapered bush to facilitate convenient and safe attachment and detachment. In order to make female thread according to the required size at the center of the tapered bush cut part No. (1), drill according to the standard for tapping is performed. Right view of Fig. 1 using only manual tap # 1. As shown by the reference numeral (6), by forming a tapered female thread mountain and screwing it in using a fastening bolt formed only with a complete threaded part, Right side view of Figure 1 so that the inner diameter of the tapered bush can act as an expansion function depending on the depth of tightening. In the center of the cut surface of the tapered bush at position (1) Manual No. 1 Roughing Tab with Rough Manual Tab 1 A tapered bush with an internal diameter expansion function characterized in that a female thread portion of a taper thread is formed as shown in (6).