JPS63281736A - Manufacturing device for hydrodynamical grooved bearing - Google Patents

Abstract

PURPOSE:To manufacture a hydrodynamical grooved bearing at low cost simply by arranging a solid ball by holding it freely rollingly with a calking means on the annular groove of the outer diameter part of a guide pin concentrically arranged at the inner diameter part of a bearing bush. CONSTITUTION:A solid guide pin 10 is concentrically arranged at the inner diameter part of a bearing bush 2. The annular groove 10a of a semi-circular bottom part is formed at the outer diameter part of this guide pin 10. A solid ball 4 in the diameter equal to or slightly smaller than the groove width is arranged at plural places in the circumferential direction on this annular groove 10a. This ball 4 is moreover held freely rollingly and in the circumferential and radial directions by the calking part 10b of the annular groove 10a. This guide pin 10 is fed at feeding speed V in the axial direction with rotating it at a rotating speed W for the bearing bush 2 by a driving means (figure omitted). A fluid groove 2a is thus spirally subjected to plastic working at the bearing bush inner diameter part by the respective rolling ball 4 to obtain a hydrodynamical grooved bearing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a pump for lubricant having at least one pattern on at least one of the corresponding surfaces of the shaft and the bearing bush. The present invention relates to a manufacturing device for a hydrodynamic grooved bearing in which a shallow groove for feeding is formed.

[Conventional technology]

Japanese Patent Application No. 62-57168 is a prior art of this type. This conventional grooved bearing manufacturing apparatus is shown in FIG. In the figure h, 2 is a bearing bush to be machined, which is fixed to a fixing jig (not shown). Reference numeral 6 denotes a hard guide pin that is rotatably supported by support means (not shown) concentrically with the bearing bush 2 . This guide pin 6 is provided with an arc-shaped annular groove 6a having an arcuate surface with a radius h equal to or slightly larger than the radius of the hard ball 4. A cage 5 is interposed between the bearing bush 2 and the guide pin 6 and is rotatably supported concentrically by support means (not shown). This cage 5 has a plurality of guide holes 5a arranged in a radial direction symmetrically with respect to the axial center, into which the balls 4 are rotatably fitted.

In the conventional manufacturing apparatus described above, a rotational speed Wp is applied to the guide pin 6 of the bearing bush 2, and a rotational speed Wp is applied to the cage 5.
k and a feed rate V, the fluid grooves 2a are formed in the inner diameter part of the bearing bushing 2 by the rolling balls 4 by plastic working.

[Problems that aA is trying to solve]

In the conventional hydrodynamic grooved bearing manufacturing apparatus as described above, the cage 5 is required to hold the ball 4 in the annular groove 7vc of the guide pin 6, making the mechanism complicated.

There was a problem in that the equipment cost increased accordingly.

The present invention was made to solve these problems, and an object of the present invention is to provide a manufacturing apparatus for a hydrodynamic grooved bearing that has a simple mechanism and reduced equipment costs.

[Means for solving problems]

The hydrodynamic grooved bearing manufacturing apparatus according to the present invention provides an annular groove with a semicircular bottom on the outer diameter of the guide pin or the inner diameter of the guide sleeve, and a plurality of balls are arranged in the annular groove in the circumferential direction. It is placed in place and held in place so that it can roll freely by caulking, and the cage is omitted.

[Effect]

In this invention, the ball is arranged in an annular groove in the semicircular bottom of the guide pin or guide sleeve, is held in a rotatable manner by caulking, and is sent in the axial direction while rotating the guide pin or guide sleeve relative to each other. As a result, a spiral groove is formed in the bearing bush or shaft.

〔Example〕

FIG. 1 shows an embodiment of a fluid grooved bearing manufacturing apparatus according to the present invention. In the figure, 2 is a bearing bush to be machined, and 010, which is fixed to a fixing jig (not shown), is a hard bushing rotatably supported by supporting means (not shown) concentrically with the bearing bush 2. It is a guide pin. An annular groove 0a with a semicircular bottom is formed on the outer diameter of the guide pin IQ, and a plurality of hard balls 4 (l' 12 in the figure) are arranged at equal intervals in the circumferential direction. It is held so that it can roll freely. 10b is a caulking portion.

The annular groove 10a in the semicircular bottom is equal to or slightly larger than the diameter of the ball 4.

The guide pin 10 holding the ball 4 is shown in FIG.

Annular groove 10a ic t'! The seated ball 4 is held by the caulking portion lob so as to be freely rollable in the circumferential direction and the radial direction.

In the manufacturing apparatus configured as described above, the guide pin l is rotated with respect to the bearing bush 2 at a rotational speed W by a driving means (not shown).

By feeding in the axial direction at a feeding rate of {circumflex over (2)}, fluid grooves 2a are formed in a spiral shape in the inner diameter portion of the p-bearing bushing 2 by each rolling ball 4 by plastic working.

FIG. 3 shows another embodiment of the invention. 1 is a shaft to be machined, which is fixed by a fixing jig (not shown);
This is a hard guide sleeve rotatably supported by a 12i-axis IVc concentric support means (not shown). This guide sleeve 12Vcd has a semicircular bottom annular groove 12a formed therein, and a plurality of hard balls 4 (in the figure, two hard balls 4) are arranged at equal intervals in the circumferential direction, and each is held rotatably by caulking. .12b Td caulking part.

The annular groove 12a has a width equal to or slightly larger than the diameter of the ball 4.

The guide sleeve 12f holding the ball 4 is shown in FIG. Annular! J 12a K is held rotatably in the circumferential direction and radial direction by a fitted ball 4ij and a caulked portion 121).

In the above device, the guide sleeve 12 is rotated by a driving means (not shown) at a rotation speed W and fed in the axial direction at a feed speed V, so that each rolling ball 4 causes the shaft 1 to A fluid groove 1a is formed in a spiral shape on the outer circumference by plastic working.

Note that, by rotating the guide bottle 10 or the guide bin 10 or the rib 12 a predetermined distance in the axial direction by rotating in one direction, and then rotating it in the opposite direction and feeding it, herringbone-type fluid grooves having different helical directions are formed.

Furthermore, by providing the guide bottle 10 or the guide sleeve 12 with multiple annular grooves in the axial direction and making the depths the same or different, fluid grooves with the same or different depths can be formed simultaneously in multiple places. Ru.

Further, by changing the diameters of the balls of the annular grooves provided at a plurality of locations in the axial direction of the guide bottle or guide sleeve, fluid grooves having different depths can be simultaneously formed at a plurality of locations.

Furthermore, in the above embodiment, the bearing bush 2 or the shaft 1 is fixed and the guide bin 1o or the guide sleeve part 2 is fed while being rotated, but the kite pin 10 or the guide sleeve 12 is fixed and the bearing bush 2 or the shaft 1 It may also be sent while rotating.

Furthermore, in the above embodiment, each ball 4 is connected to the annular groove 10a of the guide bin 1o or the annular groove 12 of the guide bush 12.
Although a plurality of balls 4 are held at regular intervals in the circumferential direction, they may be held at unequal intervals. In this case, the intervals between the fluid grooves formed by each ball 4 are unequal.

〔Effect of the invention〕

As described above, according to the present invention, an annular groove with a semicircular bottom is formed in the outer diameter part of the guide bin or the inner diameter part of the guide sleeve, and a plurality of balls are arranged in the annular groove in the circumferential direction. , each was supported so that it could roll freely by caulking,
The conventionally required coats can be omitted, the mechanism becomes simple, the operation becomes easy, and the equipment cost is reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of a hydrodynamic grooved bearing manufacturing apparatus according to the present invention, FIG. 2 is a perspective view of the guide bin portion of FIG. 1, and FIG. 3 is another embodiment of the present invention. A cross-sectional view showing a manufacturing apparatus for a hydrodynamic grooved bearing according to an example, FIG.
FIG. 5 is a cross-sectional perspective view of one half of the guide sleeve portion in the figure, and FIG. 5 is a cross-sectional view showing a conventional fluid grooved bearing manufacturing apparatus. 1... Shaft, 1a... Fluid groove, 2... Bearing bush,
2a...Fluid volume, 4...Ball% 10...Guide bottle, 10a...Annular groove at semicircular bottom, 10b...
...Caulking part, 12...Guide sleeve, 12a...
・Annular groove on semicircular bottom, 121)...Caulking part. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (4)

[Claims] (1) A manufacturing device for a hydrodynamic grooved bearing in which at least one pattern of shallow fluid grooves for pumping lubricant is formed on at least one of the corresponding surfaces of the shaft and the bearing bushing. A hard guide pin is arranged concentrically on the inner diameter of the bearing bush, or a hard guide sleeve is arranged concentrically on the outer diameter of the shaft, and the outer diameter of the guide pin is arranged concentrically on the outer diameter of the shaft. Alternatively, an annular groove with a semicircular bottom is formed in the inner diameter of the guide sleeve, and hard balls having a diameter equal to or slightly smaller than the groove width are inserted into the annular groove at multiple locations in the circumferential direction. and is rotatably held by caulking means, and includes means for imparting rotational movement and axial feed relative to the guide pin to the bearing bush or the guide sleeve to the shaft. Manufacturing equipment for hydrodynamic grooved bearings. (2) A driving means is provided to reverse the direction of relative rotational motion between the guide pin and the bearing bush, or the guide sleeve and the shaft after a predetermined feed in the axial direction, so that the fluid groove is formed in a herringbone shape. An apparatus for manufacturing a hydrodynamic grooved bearing according to claim 1. (3) The guide pin or the guide sleeve is provided with annular grooves at a plurality of locations in the axial direction, and the depths of the grooves are the same or different. Manufacturing equipment for hydrodynamic grooved bearings. (4) The guide pin or the guide sleeve is provided with annular grooves at a plurality of locations in the axial direction, and the diameters of the balls are the same or different. Manufacturing equipment for hydrodynamic grooved bearings.