JPH0518497Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a hydrostatic bearing type linear motion guide device used in a head carriage for a magnetic disk storage device and the like.

[Prior art]

Conventionally, as a linear motion guide device that requires this type of highly accurate positioning, the one shown in FIG. 6 has been known. That is, a pair of round shaft fixed bodies 52 are arranged parallel to the sliding direction and supported at both ends by support members 51 on a base 50;
Compressed air 5 is applied to the inner wall 54 of the movable body 53 fitted into the
5 is formed, and the fixed body 52
An annular bearing gap 57 is provided between the movable body 53 and a static air bearing to support the movable body 53 in a slidable manner.

[Problem that the invention attempts to solve]

However, the conventional bar guide slide mentioned above,
The following problems arose. (a) Arranging the two fixed bodies 52 parallel to the sliding direction in two directions (left, right, up and down) and fixing them to the support member 51 is a very difficult task, partly because the bearing clearance 57 is small. The larger the amount of sliding, the more difficult it becomes, and it becomes impossible to completely hold the bearing gap 57 of several μm. (b) In the movable body 53, accurately machining the dimensions and shape of the inner wall 54 parallel to two axes and two directions is as follows:
The longer the length of the movable body 53, the smaller the hole diameter of the inner wall 54, and the smaller the bearing gap 57, the more difficult it was. (c) Although the load is relatively light considering the use of this type of device, the device has become large and it has become impossible to reduce the weight of the movable body 53, which is required from the standpoint of positioning control.

【the purpose】

The present invention aims to eliminate the drawbacks of the conventional device and provide a bar guide slide that is highly accurate, compact, and inexpensive.

[Means for Solving the Problems] In order to achieve the above object, the bar guide slide of the present invention includes a cylindrical guiding fixed body whose both ends are supported and fixed on a flat base, and the base The movable body is fitted into the fixed body, and an annular space is provided between the movable body and the fixed body, and a two-plane plane is provided between the movable body and the fixed body. A static pressure radial bearing is constructed by providing an air space facing each other and supplying compressed air radially to the annular air space, and the air flow from the movable body side to the base side in the air space formed by the two opposing planes. This is a static pressure plane bearing that supplies compressed air in a direction that spreads symmetrically to both sides with respect to a vertical centerline.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings shown in FIGS. 1 to 5. FIG. 1 is a perspective view showing an embodiment of the present invention, in which a fixed body 2 consisting of a round shaft arranged in parallel on a flat base 1 is supported at both ends by a pair of supporting members 3. . FIG. 2 is a cross-sectional view, in which a plurality of orifices 6 for blowing out compressed air are arranged in the radial direction on the inner wall 5 of the movable body 4, which is fitted with an annular cavity provided between it and the fixed body 2. It constitutes a static pressure radial bearing R. Flat surfaces are formed on the upper and lower sides of the movable body 4, for example, a storage device head (not shown) is placed on the upper surface 7, and the lower surface 8 is arranged parallel to the base 1 with a gap of about 10 μm in between. , an air supply nozzle 10 communicating with an annular air supply groove 9 formed in the movable body 4 is open. The compressed air blown by the air supply nozzle 10 forms a static pressure plane bearing P between the lower surface 8 and the base 1, and restricts the rotational freedom of the movable body 4. In order to increase the angular rigidity with respect to the rotational movement of the movable body 4, the air supply nozzle 10 is formed at an angle symmetrically inclined to both sides with respect to the vertical center line of the movable body 4. A straight exhaust groove 11 extending in the direction is formed. The compressed air supplied to the static pressure radial bearing R and the static pressure plane bearing P is supplied from a common air supply hole 12 and connected to an air supply source (not shown) such as a compressor via an air supply connector 12'. ing. FIG. 3 is a sectional view of the movable body 4 taken in the sliding direction.
The movable body 4 is composed of an outer cylinder 13 and a sleeve 14 that is fitted into the outer cylinder 13 by shrink fitting or the like.The sleeve 14 has an orifice 6 that blows out compressed air to the hydrostatic radial bearing R in the sliding direction or in the sliding direction. In the outer cylinder 13, an air supply nozzle 10 for blowing compressed air to the static pressure plane bearing P is arranged in parallel. The orifice 6 is provided at the bottom of an annular air supply groove 9 formed on the outer periphery of the sleeve 14. The annular air supply groove 9 and the air supply nozzle 10 communicate with the air supply hole 12 through a communication groove 15 extending in the sliding direction, and the common air supply hole 12 supplies compressed air to the hydrostatic radial bearing R and the hydrostatic plane bearing P, respectively. are doing. Note that the air supply nozzle 10 can be easily formed by fitting and fixing a separate orifice 16 with an adhesive or the like. FIG. 4 shows another embodiment, in which the movable body 17 is composed of an outer cylinder 18 and a sleeve 19 as described above. Outer cylinder 1
At 8, air supply nozzles 20 for blowing out compressed air to the static pressure plane bearing P are arranged in parallel in the sliding direction and communicated with an annular air supply groove 21 formed on the inner periphery. On the other hand, an orifice 22 is formed on the inner periphery of the sleeve 19 to blow out compressed air to the static pressure radial bearing R.
A communication groove 23 extending in the sliding direction is formed on the outer periphery and communicates the annular air supply groove 21 with the orifice 22 . FIG. 5 shows another embodiment in which the movable body 24 is divided into several parts and connected by elastic bodies 25 made of synthetic resin or the like in order to maintain manufacturing accuracy when the movable body 24 becomes long. Thereby, the manufacturing precision of each movable body can be relaxed.

【effect】

With the above configuration, the present invention can provide a lightweight and compact bar guide slide, and does not require particularly high manufacturing precision, and high precision can be obtained with only simple adjustments when assembling the device.
Also, for example, even if the sliding amount is large,
The ease of assembly remains the same. Further, since the static pressure bearing between the movable body and the fixed body is designed to supply compressed air in a direction that spreads symmetrically to both sides, it has the effect of increasing the angular rigidity with respect to the rotational movement of the movable body.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 is a sectional front view of an embodiment of the invention, Fig. 3 is a sectional side view of a movable body applied to the invention, and Fig. 4 is a main body. A cross-sectional side view showing another embodiment of the movable body applied to the invention,
FIG. 5 is a side view of another embodiment of the present invention, and FIG. 6 is a perspective view of a conventional bar guide slide. 1... Base, 2... Support member, 3... Fixed body,
4, 17, 24... Movable body, 6, 22... Orifice, 9, 21... Annular air supply groove, 10, 20...
Air supply nozzle, 12... Air supply hole, 13, 18... Outer cylinder, 14, 19... Sleeve, 15, 23... Communication groove, P... Hydrostatic pressure plane bearing, R... Hydrostatic pressure radial bearing.

Claims (1)

[Scope of utility model registration request] It consists of a cylindrical guide fixed body supported and fixed at both ends on a flat base, and a movable body having a plane facing the base, and the movable body is inserted into the fixed body, and the above-mentioned A static pressure radial system that provides an annular space between the movable body and the fixed body, and also provides a space between the base and the base by two planes facing each other, and supplies compressed air radially to the annular space. constitutes a bearing,
A cover configured with a hydrostatic plane bearing that supplies compressed air from the movable body side to the base side in a direction that spreads symmetrically to both sides with the vertical center line of the movable body as a reference. guide slide.