KR100211881B1 - Head drum assembly - Google Patents

Abstract

The present invention relates to a head drum assembly, and more particularly, to a head drum assembly in which rotation support for axial load and radial load of an upper drum rotating at a high speed is achieved by a sliding bearing method using a fluid. A drum 50, a mountain sliding bearing 56 for supporting the axial load and the radial load at the same time and a lower end portion penetrated through the lower drum and supporting the radial load and the herringbone groove 58 for supporting the radial load are prescribed. A main shaft 54 provided at intervals, an upper drum 52 inserted into the main shaft and supported by a sliding bearing and a herringbone groove, and having a head base at a bottom thereof, and a rotor and a lower drum installed at the upper drum; Rotary transformer 68 made of a stator to be installed in, and the boss of the stator is pressed into the upper end of the main shaft and the stator and Characterized by a head drum assembly composed of an electric motor 74. The rotor is installed on the upper drum of the head position.

The present invention is to improve the assembly performance by reducing the number of components and simplifying the structure, and in particular, one sliding bearing is used for the axial load and the radial load of the upper drum without the use of expensive thrust bearings. By carrying out the support at the same time will have the effect of reducing the production cost of the product.

Description

Headdrum assembly

The present invention relates to a head drum assembly, and more particularly, to a head drum assembly in which the rotational support for the axial load and the radial load of the high-speed rotating upper drum is made in a sliding bearing method using a fluid.

In general, V-Cal records signals on a main base, a traveling system installed on the main base to take out a tape from a cassette and moves along a predetermined path, and records a signal on a moving tape disposed at an appropriate place of the traveling system. And a headdrum assembly that includes a video head for reproducing a signal from the apparatus.

The head drum assembly is equipped with a video head having a top drum that rotates at a high speed, so that the head drum assembly is very sensitive to vibrations and vibrations, and thus requires a quiet rotation. Accordingly, the head drum assembly is provided with bearing means for supporting rotation against the axial and radial loads of the upper drum.

The bearing means is largely divided into rolling bearing support and sliding bearing support according to the driving method. The former rolling bearing method is to support the shaft through the ball bearing in general, there is a problem of cost reduction, but there is a problem that can not obtain a high-precision rotational accuracy.

On the other hand, the latter sliding bearing support method is to support the shaft by forming a metal bearing containing fluid or an oil film through oil, and has the advantage of maintaining a high degree of rotation, and is widely adopted in recent years. It is becoming.

1 shows a conventional head drum assembly employing a sliding bearing support method, which includes a lower drum 10 fixed to a main base by a drum base, and a main shaft 12 assembled through the lower drum 10. And an upper drum 14 fixed to an upper end of the main shaft 12 and rotating with respect to the lower drum 10 together with the main shaft 12, and a rotation supplied to the main shaft 12 and the upper drum 14. It is composed of an electric motor 16 for generating power.

In addition, the drum boss 18 is fixed to the upper drum 14, and the main shaft 12 penetrates and is rotatably supported on the inner circumference of the drum boss 18. The bottom surface of the upper drum 14 is, for example, Two head bases 20 are attached to each other at a height of 180 degrees by screws or the like, and each head base 20 is used to magnetically record or reproduce an image signal at its radially outer end. The video head 22 is provided.

In addition, a rotary transformer 24 is installed in a vertical direction between the upper drum 14 and the lower drum 10 so as to transmit a signal in a non-contact manner, and the rotary transformer 24 is a drum boss of the upper drum 14. It is composed of a rotor 26 fixed in the vertical direction to (18), and a stator (28) installed in the lower drum 10 in a vertical direction opposite to the rotor (26), and is supplied to the video head (22). Or the video signal output from the video head 22 can be transmitted and received without generating noise.

On the other hand, the electric motor 16 is installed on the bottom of the stator 30 and the drum boss 18 of the upper drum 14, the rotor (rotator) is rotated relative to the stator 30 ( 32. The rotor 32 rotates at high speed with the main shaft 12 and the upper drum 14 as current is supplied to the stator 30, causing the video head 22 to track the signal track of the tape. Try to scan in turn.

In the head drum assembly having the above-described configuration, the upper drum 14 rotates at a high speed to generate radial loads and axial loads, and an outer circumferential surface of the main shaft 12 that contacts the drum boss 18 of the upper drum 14. Herringbone grooves 12a and 12b are formed at predetermined intervals, respectively, and oil is filled therebetween to enable rotational support of radial loads of the upper drum 14. Also, as shown in FIG. 2, a cap 34 is fixed to an upper portion of the drum boss 18, and a thrust bearing for supporting rotation against an axial load of the upper drum 14 is attached to a bottom of the cap 34. 36 is installed, the thrust bearing 36 is in contact with the upper end surface of the main shaft 12, the herringbone groove 36a is formed on the contact surface of the thrust bearing 36, the upper drum during the high-speed rotation of the upper drum 14 Provide flotation force to (14) to make the rotation smoother.

In the assembly process of the head drum assembly configured as described above, first, the main shaft 12 is pressed into the lower drum 10, and the stator 28 and the electric motor of the rotary transformer 24 are formed on the inner upper surface of the lower drum 10. The stator 30 of (16) is installed. Also, the drum boss 18 and the head base 20 are fixed to the upper drum 14, and the rotor 26 of the rotary transformer 24 and the rotor 32 of the electric motor 16 are fixed to the drum boss 18. Install it. In this state, the main shaft 12 of the lower drum 10 is inserted into the drum boss 18 of the upper drum 14 to be assembled, and the thrust bearing 36 installed therein is brought into close contact with the upper end surface of the main shaft 12. The cap 34 is attached to the drum boss 18 and the assembly is completed.

However, in such a conventional head drum assembly, there are many components and the number of assembling labor increases to reduce the assemblability and productivity, and there is a problem in that there is an element causing vibration or vibration during the high speed rotation of the upper drum during the assembly process. That is, since the drum boss 18 is fixed to the upper drum 14 by screws, the cap 34 is also fixed to the drum boss 18 by screws, etc., so assembling is very cumbersome, and the upper drum 14 directly Since it is not supported by the main shaft 12 to be rotated through the drum boss 18, the upper drum 14 when the upper drum 14 and the drum boss 18 are not precisely and firmly assembled during the assembly process. It causes vibrations and vibrations during high speed rotation, which degrades performance.

In addition, the conventional head drum assembly uses a thrust bearing 36 formed with a herringbone groove 36a for supporting the axial load of the upper drum 14 and providing floating force to the upper drum 14. In addition, the number of parts is increased, the assemblability is lowered, and the manufacturing cost of the product is increased by the expensive thrust bearing.

The present invention has been made in order to solve such a conventional problem, the object is to improve the assembly and productivity by reducing the components and assembly labor, the upper drum is directly supported by the main shaft to be assembled during assembly It provides a head drum assembly that can prevent the defects and reduce the manufacturing cost of the product by eliminating expensive parts by using the sliding bearing that supports the radial load of the upper drum and the existing radial load. have.

1 is a longitudinal sectional view showing a configuration of a conventional head bearing assembly of a sliding bearing support method.

Figure 2 is an enlarged cross-sectional view of the main portion of Figure 1;

Figure 3 is a longitudinal sectional view showing the configuration of the head drum assembly according to the present invention.

Figure 4 is an exploded view illustrating the assembly process of the head drum assembly according to the present invention.

Figure 5 is an enlarged view of the main portion of Figure 3 showing the operating state of the sliding bearing in the head drum assembly according to the present invention.

* Explanation of symbols for main parts of the drawings

50: lower drum 52: upper drum

52a, 62a: sloped surface 54: main axis

56: mountain sliding bearing 56a, 58: herringbone groove

60: expansion hole 62: bushing

63: Cover 64: Head Base

68: rotary transformer 74: electric motor

The object of the present invention is a predetermined interval between a lower drum, a mountain sliding bearing for supporting the axial load and the radial load at the same time through a lower end through the lower drum and press-fitted to the outer periphery, and a herringbone groove for supporting the radial load. Rotary provided with a main shaft, the upper drum is inserted into the main shaft and supported by the sliding bearing and herringbone groove and the head base is installed on the bottom, the rotor and the stator is installed on the lower drum It is achieved by providing a head drum assembly consisting of a transformer and an electric motor in which a boss of the stator is pressed into the upper end of the main shaft and a rotor is installed in the upper drum at a position opposite the stator.

Hereinafter, a preferred embodiment of the head drum assembly according to the present invention will be described in more detail with reference to the accompanying drawings.

Figure 3 is a longitudinal cross-sectional view showing the configuration of the head drum assembly according to the present invention, the head drum assembly is largely fixed to the main drum (not shown) of the V Deck mechanism and the upper drum 52 that rotates at high speed (52) ) The lower end portion of the main shaft 54 is press-fitted into the lower drum 50, and the upper drum 52 is inserted into the main shaft 54 to be rotatably supported so as to be free to rotate with respect to the lower drum 50.

At this time, the outer periphery of the main shaft 54 is provided with a pair of sliding bearings that simultaneously support the radial load and the axial load of the upper drum (52). The upper sliding bearing is a sliding bearing 56 that simultaneously supports the radial load and the axial load of the upper drum. Herringbone grooves 56a are formed on the upper and lower inclined surfaces, and the lower sliding bearing is a conventional sliding bearing. Herringbone grooves 58 are formed to support the radial load of the upper drum 52.

At this time, the mountain sliding bearing 56 may be formed integrally by directly processing the main shaft 54, but is preferably formed by separately manufacturing the mountain sliding bearing 56 is pressed into the main shaft 54. Therefore, since the sliding bearing 56 protrudes more than the outer circumference of the main shaft 54, the expansion hole 60 is formed at the upper end of the shaft hole of the upper drum 52 so that the sliding bearing 56 can be inserted therein, An inclined surface 52a in close contact with the lower inclined surface of the mountain-type sliding bearing 56 is formed at the upper end.

In addition, the bushing 62 is inserted into the expansion hole 60 of the upper drum 52. The outer periphery of the bushing 62 is press-fitted into the inner periphery of the expansion hole 60, and the inner periphery is the main shaft 54. ) Is penetrated and rotated, and another inclined surface 62a is formed at the lower end of the inner circumference of the bushing 62 to be in close contact with the upper inclined surface of the mountain sliding bearing 56. Since the oil is filled between the mountain sliding bearing 56 and the inclined surface 52a, 62a, a cover 63 covering the expansion hole 60 is fixed to the upper drum 52 so that the oil does not leak, and the main shaft is fixed. The portion in contact with 54 is bent downward to prevent oil from leaking out between the cover 63 and the main shaft 54.

Then, on the bottom of the upper drum 52, for example, two head bases 64 are attached so as to be height-adjustable at intervals of 180 degrees by a screw or the like, each head base 64 having its radial direction. The outer end is provided with a video head 66 for magnetically recording or reproducing a video signal. In addition, a rotary transformer 68 is installed between the upper drum 52 and the lower drum 50 in a contactless manner so that the video signal is supplied to or output from the video head 66. It is to be able to transmit and receive without the generation of noise, the rotary transformer 68 is composed of a rotor 70 is installed on the upper drum 52 and the stator 72 is installed on the lower drum 50, mutually fine It is installed to face the gap.

On the other hand, the upper drum 52 is provided with an electric motor 74 to provide a rotational force to rotate at high speed, the electric motor 74 is composed of a stator 76 and the rotor 78. The boss 80 of the stator 76 is fixed to the upper end of the main shaft, and the rotor 78 is installed in the upper drum 52 in the position opposite to the stator 76, the rotor 78 is the stator 76 Rotation at high speed with the upper drum 52 causes the video head 66 to scan the signal tracks of the tape in turn as current is supplied.

In the head drum assembly of the present invention having such a configuration, components are simplified and assembly labor is reduced and assembly work is easily performed. This describes the assembly process of the head drum cooking body according to the present invention with reference to FIG. First, the stator 72 of the rotary transformer 68 is fixed to the upper surface of the lower drum 50, and the main shaft 54 is press-fitted into the shaft hole. In addition, the head base 64 and the rotor 70 of the rotary transformer 68 are fixed to the bottom, and the shaft hole of the upper drum 52 provided with the rotor 78 of the electric motor 74 is mounted on the upper side wall. After assembling so as to be rotated and supported, the sliding bearing 56 is pressed into the main shaft 54, and the lower inclined surface is assembled to be in close contact with the inclined ground surface 52a formed at the upper end of the shaft hole of the upper drum 52.

Thereafter, the outer circumferential edge of the bushing 62 is press-fitted into the inner circumferential edge of the expansion hole 60 of the upper drum 52, and the inner circumferential edge is assembled to the outer circumferential edge of the main shaft 54 to form an inclined bottom surface 62a. It is made to be in close contact with the upper inclined surface of the mountain sliding bearing 56. The assembly is completed by fixing the cover 63 to the upper drum 52 to cover the expansion hole 60 and then fixing the boss 80 of the stator 76 to the upper end of the main shaft 54.

The head drum assembly of the present invention is assembled as described above, the assembly number is improved because the number of parts is reduced and the assembly labor is improved, and since the upper drum 52 is directly supported by the main shaft 54, it is quietly rotated without vibration or vibration at high speed. This becomes possible. In addition, the sliding bearing 56 provided on the main shaft 54 simultaneously supports the axial load and the radial load of the upper drum 52, thus eliminating the need for a conventional thrust bearing. As shown, the herringbone grooves 56a formed on the upper and lower inclined surfaces of the mountain sliding bearings 56 exert a floating force in a vertical direction with respect to the inclined ground surface 62a of the bushing 62. Since the components are formed in the vertical and horizontal directions with respect to the upper drum 52, the horizontal bearing force increases the rotational support force against the radial load of the upper drum 52, and the vertical component is the upper drum 52. In addition to increasing the rotational support for the axial load of the at the same time has the effect of floating the upper drum (52).

In addition, the herringbone groove 56a formed on the lower inclined surface of the mountain sliding bearing 56 exerts a floating force in the vertical direction with respect to the inclined ground surface 52a of the upper drum 52. Since the component force is formed in the vertical and horizontal directions with respect to 52, the horizontal component force also increases the rotational support force with respect to the radial load of the upper drum 52 and the component force in the vertical direction is increased. It has the effect of further increasing the rotational support force against the axial load.

As described above, according to the head drum assembly according to the present invention, the assembly labor is reduced by the reduction of the components and the simplification of the structure, and the assemblability is improved. In particular, one sliding bearing is used without the use of an expensive thrust bearing. By simultaneously performing the support for the axial load and the radial load of the drum is to have the effect of reducing the production cost of the product.

Claims (7)

Lower drum 50, a mountain sliding bearing 56 for supporting the axial load and the radial load at the same time through the lower end penetrates through the lower drum 50 and the outer circumference and the herringbone groove for supporting the radial load ( An upper drum 54 having a predetermined interval therebetween, and an upper drum inserted into the spindle 54 and supported by a sliding bearing 56 and a herringbone groove 58, and having a head base 64 mounted on the bottom thereof. A rotary transformer (68) comprising a rotor (70) installed on the upper drum (52) and a stator (72) installed on the lower drum (50), and a stator at an upper end of the main shaft (54). A head drum assembly, characterized in that it comprises an electric motor (74) in which a boss (80) is press-fitted and a rotor (78) is installed in an upper drum (52) at a position facing the stator (76). According to claim 1, wherein the expansion hole 60 of a larger diameter than the shaft hole is formed so that the mountain sliding bearing 56 is inserted into the upper end of the shaft hole of the upper drum 52, the lower inclined surface of the mountain sliding bearing 56 is Head drum assembly, characterized in that the rotation is supported in close contact with the inclined surface (52a) formed in the upper end of the shaft hole of the upper drum (52). According to claim 2, wherein the outer periphery of the bushing 62 is pressed into the inner periphery of the expansion hole 60, the inner periphery of the bushing 62 is inserted into the main shaft 54 to be rotated and supported, the bushing 62 The inclined sloping surface (62a) formed in the inner peripheral lower end of the head drum assembly, characterized in that it is in close contact with the upper inclined surface of the mountain sliding bearing (56). The head drum assembly according to claim 2 or 3, wherein a herringbone groove (56a) is formed on an upper inclined surface and a lower inclined surface of the mountain sliding bearing (56). 5. The cover 63 of claim 4, wherein oil is filled between the inclined surface of the mountain sliding bearing 56 and the inclined surface 52a and 62a, which is in close contact with the inclined surface, and covers the upper portion of the expansion hole 60. Head drum assembly, characterized in that fixed to the drum (52). The head drum assembly according to claim 1 or 4, wherein the mountain sliding bearing (56) is manufactured separately and press-fitted to the main shaft (54). The head drum assembly according to claim 1 or 4, wherein the mountain sliding bearing (56) is formed integrally by directly processing the main shaft (54).