JPS63225724A - Manufacturing device for hydrodynamic grooved bearing - Google Patents

Abstract

PURPOSE:To reduce abrasion of a ball end a guide pin by bearing a ball on a spherical surface of a spherical recess portion of the guide pin, relatively rotating the guide pin and a cage and feeding same to form a spiral hydrodynamic groove on the inside diameter portion of a bearing bush. CONSTITUTION:A bearing bush 2 to be worked is fixed to a fixture. A hard guide pin 10 is supported concentrically with the bush 2. Plural spherical recess portions 11 respectively having a spherical surface with a radius equal to or a little larger than the radius of a hard ball 4 are provided at equal intervals in the circumferential direction on the guide pin. A cage 5 rotatably supported is interposed between the bush 2 and the guide pin 10 concentrically therewith. Guide holes 5a are disposed on the cage 5 corresponding to the respective spherical recess portions 11, and the balls 4 are fitted in the holes in such a manner as to freely roll. When the guide pin 10 and the cage 5 are relatively rotated and fed to the bearing bush 2, a spiral hydrodynamic groove is plastic-worked on the inside diameter portion 2b. At this time, the balls 4 are supported by the spherical recess portions 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention has a shaft and a bearing bush, and has at least one pattern of lubricant pumping action on at least one of the corresponding surfaces of both. The present invention relates to an apparatus 1 for manufacturing a hydrodynamic grooved bearing in which shallow grooves are formed.

[Conventional technology]

Conventionally, there is a grooved bearing shown in FIG. 9. sleeve 1
is rotatably inserted into the inner diameter of the bearing bush 2, and the inner diameter of the bearing bush 2 is provided with a dynamic pressure generating #42a. Note that this dynamic pressure generating groove 2a is formed on at least one of the inner diameter part of the bearing bushing 2 and the outer diameter part of the shaft 1.
Lubricant is injected between the corresponding surfaces of the shaft 1 and the bearing bushing 2, and when one of them rotates, the pumping action of the dynamic pressure generating groove 2a generates the pressure necessary for lubricating the bearing. It is.

As a conventional manufacturing device for forming dynamic pressure generating grooves of lubricant in a spiral shape on such a bearing bush or shaft, for example, Japanese Patent Laid-Open No. 5
There is one disclosed in Japanese Patent Application Laid-open No. 4-84155 and Japanese Patent Application Laid-Open No. 61-6426, which are shown in FIGS. 10 and 11.

In FIG. 10, a guide pin 3 is rotatably supported concentrically with the bearing bush 2 to be machined, and a cage 5 is rotatably supported concentrically between the bearing bush 2 and the guide pin 3. A plurality of holes 5a are provided in the cage 5 at equal intervals in the circumferential direction, and hard balls 4 are inserted into these holes.
It is fitted so that it can roll freely.

The guide pin 3 is attached to the bearing bush 2 which is fixedly held.
This rotation causes the cage 6 to rotate by Wk as if the cage 6 were to follow the ball 4 rolling between the guide pin 3 and the bearing bush 2. Give the velocity and feed rate of vk, ball 4
As a result, the inner diameter portion 2b of the bearing bushing 2 is plastically worked to form a dynamic pressure generating groove 2a which acts as a lubricant pump.

・The manufacturing equipment shown in FIG. 11 is ・$ 10 FIG.
a is arranged, and a center hole 6b is bored. A hard fixing pin 8 is press-fitted into this center hole 6b, and each guide hole 6
A hard ball 4 is inserted or lightly press-fitted into the fixed pin 8 so that the sum of the diameter of the fixed pin 8 and the diameter of 42 balls is slightly larger than the inner diameter of the bearing bush 2. A diameter of 8 is selected.

In this state, the rotation speed #lW and the feed speed V are applied to the guide pin 6.
[Problems to be Solved by the Invention] The conventional hydrodynamic grooved bearing as described above In the manufacturing equipment, the ball 4 and the guide pin 3 or the fixed pin 8 are in pressure contact with each other, so the contact surface pressure is becomes large. For this reason, when using manufacturing equipment, the borks and guide pins or fixing pins wear out over a short period of time, and the hydrodynamic grooves are formed. There was a problem.

The present invention was made to solve these problems, and a hydrodynamic groove is stably formed with high precision on at least one of the corresponding surfaces of the shaft and the bearing bush, and the ball and guide The object of the present invention is to provide a manufacturing device for a hydrodynamic grooved bearing that can reduce wear on pins or guide sleeves and can be used for a long period of time.

[Means for solving problems]

The hydrodynamically grooved bearing manufacturing apparatus according to the present invention provides a plurality of spherical recesses in the circumferential direction on the outer diameter part of the guide pin or the inner diameter part of the guide sleeve, and the grooved grooved bearing is provided with a plurality of spherical recesses in the circumferential direction. A cylindrical cage is interposed between the guide sleeve and the shaft, and the cage is provided with guide holes at positions corresponding to the respective spherical recesses, and the cage is provided in the spaces between the spherical recesses and the guide holes. A ball with a diameter larger than the wall thickness of the spherical recess and a radius equal to or slightly smaller than the radius of the spherical surface of the spherical recess is inserted into the spherical recess so that the balls are received in contact with the spherical recess with their spherical surfaces.

[Effect]

By feeding the guide pin and cage to the bearing bush while rotating relative to each other, a spiral hydrodynamic groove is formed in the inner diameter of the bearing bush, or by feeding the guide sleeve and cage to the shaft while rotating relative to each other. By feeding, a hydrodynamic groove is formed in a spiral shape on the outer diameter portion of the shaft. The balls are received on the spherical surface of the spherical recess of the guide/guide sleeve, which significantly reduces the contact surface pressure and reduces mutual wear.

〔Example〕

FIG. 1 shows a first embodiment of the invention. In the figure, 2
is a bearing bush to be machined, which is fixed to a fixture (not shown). Reference numeral 10 denotes a hard guide pin that is rotatably supported by supporting means (not shown) concentrically with the bearing bush 2. Spherical recesses 11 having a spherical surface with an enlarged radius are provided at regular intervals in the circumferential direction.Rotated by a support means (not shown) K concentrically between the bearing bush 2 and the guide pin lO. A freely supported cage 5 is interposed.The cage 5 has guide holes 5 at positions corresponding to the respective spherical recesses 11.
A is provided, and the ball 4 is fitted in a removable manner.

In the manufacturing apparatus configured as described above, the guide pin 10 and the cage 5 are fed while being rotated together by a driving means (not shown), and are plastically worked into the inner diameter part 2b of the bearing bushing 2 by the balls 4. Forming the dynamic pressure generating groove 2a serving as the target groove in a spiral shape is the same as in the conventional device described above. However, the difference is that the guide pin 1o and the cage 5 are rotated and fed together.

The ball 4 is supported in contact with the spherical surface of the spherical recess 11 of the guide pin 10, so that the contact surface pressure is significantly reduced and mutual wear is reduced.

The reduction in the contact surface pressure between the ball 4 and the annular groove 1 will be explained next.

In the conventional device, the ball 4 and the guide pin 3 or fixing pin 8 are in ball-cylindrical contact. However, in this invention,
The spherical concave portion 1 of the guide pin 10 corresponding to the ball 4 is in spherical contact with the ball. These contact models can be replaced by the conventional one with a turret and a plane, and the invented one with a cylinder and an inscribed sphere. Here, the contact surface pressures of the conventional example and that of the present invention will be compared.

The contact stress between the contact and the plane is Poi = 6/r, "X (r2- rl)"/
(rlr2). Where, Pot: Maximum contact surface pressure between the sphere and the plane PO2: Large contact surface pressure between the sphere and the inscribed sphere rg, rl: radius of g (C radius of the ball) r2: radius of the inscribed sphere (the spherical surface of the spherical recess) (Radius of) 1*E1: Poisson's ratio of g (ball), modulus of longitudinal elasticity ゛ν2J2: Poisson's ratio of ball or inscribed ball (C guide pin), modulus of longitudinal elasticity P: Loading (1), (2) formula From Po2/Po5=3(r2-rl)ro/(r1r2)
---(3) is obtained. Now ro=rl=1
．． 00mm, r2 = 1. If olmm, then P
g2 /P(B s 0 ,046), and the contact surface pressure of the present invention is δ chi compared to the conventional one.

Furthermore, it is obvious that as the radius of the ball 4 and the radius of the spherical surface of the spherical recess 11 become equal, the mutual contact surface pressure becomes smaller.

As described above, according to the present invention, the contact surface pressure can be significantly reduced compared to the conventional one. FIG. 2 shows a second embodiment of the present invention, and the cage of the device shown in FIG. is attached to a guide pin. Hard guide pin 12
O13, in which a plurality of spherical recesses ml are provided at equal intervals in one circumferential direction on the smaller outer diameter part of the guide pin 12, is a cage that is fitted and fixed to the smaller outer diameter part of the guide pin 12.
A guide hole 13a is provided at a position corresponding to each of the spherical recesses 11.
is provided. Hard balls 4 are fitted into these guide holes 13a so as to be able to roll freely.

FIG. 3 shows a third embodiment of the present invention, in which 014, which is a device for forming dynamic pressure generating grooves on the outer diameter of a shaft, is a shaft to be machined, and a fixing jig (not shown) is used. Fixed.

Reference numeral 15 denotes a hard guide sleeve rotatably supported concentrically with the shaft 14 by support means. This guide sleeve 15 has a plurality of spherical recesses 16 having a spherical surface with a radius equal to or slightly larger than the radius of the hard ball 4 on the inner diameter portion 15a at equal intervals in the circumferential direction.

A cage 6 rotatably supported by supporting means (not shown) is interposed concentrically between the shaft 14 and the guide sleeve 15.
Guide holes 5a are provided at positions corresponding to the respective guide holes 5a, into which the balls 4 are fitted so as to be freely rollable. With the device configured in this manner, the dynamic pressure generating groove 14a is formed in the outer diameter portion of the vda14.

FIG. 4 shows a fourth embodiment of the present invention, in which the cage of the device shown in FIG. 3 is fixed to a guide sleeve.
A plurality of spherical recesses 16 are provided at equal intervals in the circumferential direction on the inner diameter of the hard guide sleeve 1. O18 is a cage that is fitted and fixed to the guide sleeve 1, and corresponds to each of the above-mentioned spherical recesses. 1 guide hole in each position
8a is provided. Hard ball numbers are rotatably fitted into these guide holes 18a.

FIG. 5 shows a fifth embodiment of the present invention, in which a holder 20 made of an elastic material is attached to the outside of the cage 5 of the device shown in FIG. It's stuck. These holding bodies 20 have guide holes 5a and small diameter holes 20a.
The ball 4 is partially exposed and held in a rotatable manner to prevent it from falling off when the ball 4 is not fitted into the bearing bush 2. The figure shows a fifth embodiment of the present invention. In the cage 13 of the device shown in FIG.
l! F, and as in the case of Fig. 5, each ball 4
@DojizaiK.

In addition, 0 Figure 1 shows 21 of this invention, which is designed to be held while preventing it from falling off! A holding body 20 is fixed to the inner diameter of the cage 5 of the device shown in FIG. , and is held to prevent it from falling off.0 FIG. 8 shows an eighth embodiment of the present invention, and the above! ! A holder 20 is fixed to the inner diameter of the cage 18 of the device shown in Fig. 4 in a counterbore at an external position of each guide hole 18a, and is designed to hold each ball number rotatably and prevent it from falling off. .

The driving means is designed such that dynamic pressure generating grooves with different helical directions are formed by rotating the guide pin or guide sleeve and cage in one direction to a predetermined distance in the axial direction and then rotating them in the opposite direction. (not shown) is provided.

Furthermore, in the above embodiment, by rotating and feeding the guide pin and cage or the guide sleeve and cage,
Although the arc-shaped annular grooves are formed, they may be fixed and the bearing bush or shaft may be rotated and fed.

Furthermore, in the above embodiment, the spherical recesses of the guide pin or the guide sleeve are arranged at equal intervals in the circumferential direction, but are arranged at unequal intervals, so that the multiple helical dynamic pressure generating grooves formed by the valley balls 4 are mutually spaced. The pitches may be made unequal.

Furthermore, in the above embodiment, one set of reciprocating spherical recesses was provided in the guide pin or guide sleeve in the circumferential direction; however,
A plurality of sets may be provided in the axial direction. In this case, the spherical recesses of the front set are made deeper and the dynamic pressure generating grooves are made shallower in the forward direction, and the spherical recesses of the rear set are made shallower and the previously formed dynamic pressure generating grooves are machined. Processing may be performed to further increase the depth.

Furthermore, the guide pin or guide sleeve is provided with multiple sets of spherical recesses in the axial direction, and the diameter of the ball placed in the annular groove on the rear side is made larger than that of the ball placed in the spherical recess on the front side with respect to the forward direction. However, the previously formed dynamic pressure generating groove may be processed to further increase the circular arc radius or increase the depth.

Furthermore, in the Maku and Kamikiyo examples, each guide hole 5a of the cage,
Although the holders 20 are fixed to the external positions of 13a and 18a, an annular counterbore is provided on the outer diameter or inner diameter of the cage through which each guide hole passes, and an elastic annular holder is fitted into this annular counterbore. The holding body may be provided with holes through which a portion of each ball is exposed at positions corresponding to the respective guide holes, so that the balls can be held so as to be able to roll freely and to prevent them from falling off.

〔Effect of the invention〕

As described above, according to the present invention, a plurality of spherical recesses are provided in the circumferential direction on the outer diameter part of the guide pin or the inner diameter part of the guide sleeve, so that a plurality of spherical recesses are provided between the guide pin and the bearing or between the guide sleeve and the shaft. A cylindrical cage is interposed between the cages, guide holes are provided in the cage at positions corresponding to the spherical recesses, hard balls are placed in these guide holes, and - the balls are placed in the spherical recesses. Since the contact pressure can be received by contact, the contact surface pressure is significantly lower than that of conventional devices, reducing wear on the ball and guide pin or guide sleeve, making it durable for long-term use, and preventing damage to the shaft or bearing bush. 0 that can stably form hydrodynamic grooves with high consistency.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a hydrodynamic grooved bearing manufacturing apparatus showing a first embodiment of the present invention, and FIGS. 02...Bearing Bush, 2a...dynamic pressure generating groove, 2b...
...Inner diameter part, 4...Ball, 5...Cage, 5a.
... Guide hole, 10 ... Guide pin, 1 U ... Spherical recess, 12 ... Guide pin, 13 ... Cage, 13
a River guide hole, 14... Shaft, 14a... Dynamic pressure generating groove, 15... Guide sleeve, 16... Spherical recess, 17... Guide sleeve, 18... Cage, 18
a...Guide hole, 20...Holding body Note that the same reference numerals in the drawings indicate the same or equivalent parts.

Claims (6)

[Claims] (1) Manufacture of a hydrodynamic grooved bearing in which at least one pattern of shallow power-generating grooves for pumping lubricant is formed on at least one of the corresponding surfaces of the shaft and the bearing bushing. In the device, a guide pin harder than the bushing is concentrically arranged on the bearing bush, or a guide sleeve harder than the shaft is arranged concentrically on the shaft, and the outer diameter of the guide pin Alternatively, a plurality of spherical recesses are provided in the inner diameter part of the guide sleeve in the circumferential direction, and a cage is interposed between the guide pin and the bearing bush or between the guide sleeve and the shaft, and the cage has each of the spherical recesses. Guide holes are provided at positions corresponding to the recesses, and a hard ball with a diameter larger than the wall thickness of the cage and a radius equal to or slightly smaller than the radius of the spherical surface of the spherical recess is inserted into each of the guide holes. The fluid dynamics system is characterized in that it is provided with means for relatively simultaneously imparting rotational motion and axial feed to the guide pin and cage to the bearing bush, or to the guide sleeve and cage to the shaft, respectively. Manufacturing equipment for grooved bearings. (2) In order to obtain a pattern in which the advancing direction of the spiral of the circular arc-shaped annular groove is opposite to each other on both sides with the center in the axial direction as a reference,
The direction of relative rotational movement between the guide pin and cage and the bearing bush or the guide sleeve and cage and the shaft after the guide pin and cage or the guide sleeve and cage have been moved over a predetermined distance in the axial direction. 2. The apparatus for manufacturing a hydrodynamic grooved bearing according to claim 1, further comprising driving means for causing the bearing to be rotated in reverse. (3) A hydrodynamic grooved bearing according to claim 1, characterized in that a plurality of sets of a plurality of spherical recesses of the guide pin or the guide sleeve are provided in the axial direction and have different groove depths. manufacturing equipment. (4) A plurality of sets of spherical recesses are provided in the guide pin or guide sleeve in the axial direction, balls of different diameters are arranged in both sets, and the dynamic pressure generating grooves formed are sequentially set to a predetermined depth. 2. The apparatus for manufacturing a hydrodynamic grooved bearing according to claim 1, wherein the hydrodynamic grooved bearing is machined. (5) The apparatus for manufacturing a hydrodynamic grooved bearing according to any one of claims 1 to 4, characterized in that the cage is fixed to the outer diameter part of the guide pin or the inner diameter part of the guide sleeve. (6) A patent claim characterized in that the cage is provided with a holder that is fixed to the outer diameter part or the inner diameter part of the cage at a position outside each guide hole, and holds the ball in a rotatable manner while exposing a part of the ball. A manufacturing apparatus for a hydrodynamic grooved bearing according to items 1 to 5.