JP2953151B2 - Spherical sliding bush and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spherical sliding bush and a method of manufacturing the same, and more particularly to a spherical sliding bush capable of effectively suppressing variations in sliding performance due to dimensional errors and the like, and a method of manufacturing the same. It is.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Utility Model Laid-Open Publication No. 53-159444, a shaft fitting having a spherical convex surface at an axially intermediate portion is positioned at a predetermined distance outside the shaft fitting. , A cylindrical race fitting is disposed, and the race fitting allows the spherical convex surface of the shaft fitting to slide through a sliding contact cylindrical body having a spherical concave surface that is slidably fitted to the spherical convex surface. There is known a so-called spherical sliding type bush having a structure in which the bushing is held. In such a bush, the displacement between the torsional direction around the axis and the displacement in the torsional direction inclined with respect to the axis are caused by sliding between the spherical convex surface of the shaft fitting and the spherical concave surface of the sliding contact cylinder, respectively. Because it is acceptable, it has been suitably used as a coupling device such as a suspension mechanism of an automobile.

[0003] In such a spherical sliding type bush, generally, as shown in the above-mentioned publication, the axial end portion of the race fitting is caulked as the mounting structure of the sliding contact cylinder to the race fitting. A structure has been adopted in which the sliding contact cylindrical body extrapolated to the shaft fitting is pressed and held in the axial direction.

[0004] However, the present inventor has studied and found that in such an attachment structure, the lace fittings are liable to be produced due to an axial dimensional error in the sliding contact cylindrical body and the lace fittings and a variation in the swaging margin of the lace fittings. It is inevitable that the holding force in the axial direction exerted on the sliding contact cylinder at the time of mounting by caulking processing changes, and therefore, the surface pressure exerted between the sliding surfaces of the sliding contact cylinder and the shaft fittings ,
As a result, it has been found that there is a problem that the sliding performance of the product varies.

Further, in the spherical sliding type bush as described above, a contact pressure is generated between the race fitting and the sliding contact cylinder due to a radial dimensional error of the sliding contact cylinder and the race fitting, and the sliding pressure is generated. There is a possibility that the sliding performance may be reduced due to a diameter reduction force applied to the contact cylinder, or a radial gap may be generated between the race fitting and the sliding contact cylinder, which may cause a problem such as rattling. There was also.

Further, such a spherical sliding type bush is usually mounted by press-fitting and fixing a lace fitting into a mounting hole such as an arm eye provided in one member to be connected. However, when the press fitting allowance at the time of the attachment increases, the diameter of the race fitting is reduced, and pressure is applied to the outer peripheral surface of the sliding contact cylindrical body. There was a risk that the pressure would increase and the desired sliding performance would not be obtained.

[0007]

The present invention has been made in view of the above-mentioned circumstances, and the problem to be solved is that variations in sliding performance due to errors in manufacturing dimensions of parts and the like are advantageous. Another object of the present invention is to provide a spherical sliding-type bush that can be reduced or prevented and that can effectively stabilize sliding performance.

[0008]

In order to solve the above-mentioned problem, the present invention is characterized in that, with respect to a shaft fitting having a spherical convex surface in an axially intermediate portion, a position is set outside of the spherical convex surface at a predetermined distance. To arrange a cylindrical lace fitting,
A spherical sliding type in which the spherical fitting is held slidably by the race fitting via a sliding cylindrical body having a spherical concave surface slidably fitted to the spherical fitting by the sliding fitting. In the bush, the outer peripheral surfaces on both sides in the axial direction of the sliding contact cylindrical body are respectively tapered outer peripheral surfaces that decrease in diameter as going outward in the axial direction, and tapered inner peripheral surfaces corresponding to the respective tapered outer peripheral surfaces. A pair of annular stoppers having an outer diameter larger than the sliding contact cylindrical body having a surface are arranged in contact with the tapered outer peripheral surface, while the lace fitting has an axially intermediate portion having a predetermined length. The sliding contact cylindrical body is fixed to the race metal fitting by fixing the outer peripheral surface of each of the metal fittings to the small-diameter portion with a stepped cylindrical shape having a reduced diameter. Axial and axial via fasteners Angularly in that allowed clamping support.

Further, in the present invention, there is provided (a) a step of preparing a shaft fitting having a spherical convex surface at an intermediate portion in the axial direction;
(B) The inner peripheral surface is a spherical concave surface that is slidably fitted to the spherical convex surface, while the axially opposite sides of the outer peripheral surface each have a tapered shape whose diameter decreases as going outward in the axial direction. (C) a step of extrapolating and disposing the sliding contact cylindrical body having the outer peripheral surface on the spherical convex surface of the shaft fitting; and (c) a tapered inner periphery corresponding to each tapered outer peripheral surface of the sliding contact cylindrical body. Having a surface,
A pair of annular stoppers having an outer diameter larger than the sliding contact cylindrical body are arranged on each tapered outer peripheral surface of the sliding contact cylindrical body, and a predetermined number of axially outwardly extending with respect to the stoppers. Applying a biasing force to abut the tapered outer peripheral surface of the sliding cylinder; and (d) extrapolating and disposing a cylindrical race fitting outside the shaft fitting, and setting an axially intermediate portion thereof to a predetermined length. Let's draw it all the way, and attach such a lace fitting,
Fitting and fixing to the outer peripheral surface of each of the stoppers, thereby clamping and supporting the sliding contact cylinder in the axial direction and the direction perpendicular to the axis with respect to the race fittings via the stoppers. , Having a method of manufacturing a spherical sliding type bush,
This is the feature.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

First, FIGS. 1 and 2 show an embodiment of a spherical sliding type bush having a structure according to the present invention. In these figures, reference numeral 10 denotes a shaft fitting, which has a substantially cylindrical shape as a whole. Also, this shaft fitting 1
A spherical convex portion 12 that projects spherically outward in the radial direction is integrally formed at the central portion in the axial direction of 0, and the outer peripheral surface of the spherical convex portion 12 is a spherical convex surface 14.

A race fitting 16 having a substantially thin cylindrical shape is coaxially arranged outside the shaft fitting 10 so as to be positioned at a predetermined distance in the radial direction. The lace fitting 16 has an inner diameter that is larger than the outer diameter of the spherical projection 12 of the shaft fitting 10 by a predetermined dimension, and an axial length that is shorter than the axial length of the shaft fitting 10 by a predetermined dimension. Also,
The lace fitting 16 has a central portion in the axial direction,
The diameter of the small-diameter portion 18 and the large-diameter portion 2 is reduced over a predetermined length slightly longer than the spherical convex portion 12 of the zero.
0, 20 are formed in a stepped cylindrical shape.

Further, the shaft fitting 10 and the race fitting 1
A sliding contact cylinder 22 is interposed between the spherical convex portion 12 and the small-diameter portion 18. As shown in FIGS. 3 and 4, the sliding contact cylinder 22 has a substantially cylindrical shape as a whole, and has a slightly longer axial length than the spherical projection 12 of the shaft fitting 10. Have been. The inner peripheral surface is a spherical concave surface 24 having a shape corresponding to the spherical convex surface 14 of the shaft fitting 10. On the other hand, the outer peripheral surface is formed to have a slightly smaller outer diameter than the small diameter portion 18 of the race fitting 16, and both axial portions are tapered outer peripheral surfaces 27 whose diameter gradually decreases toward the outer side in the axial direction. , 27.

A slit 26 is provided at one location on the circumference of the sliding contact cylinder 22. By expanding the slit 26, the spherical projection 1 of the shaft fitting 10 is formed.
2 can be extrapolated. As described above, since the sliding contact cylinder 22 is extrapolated to the shaft fitting 10, a spherical sliding surface is formed between the spherical concave surface 24 and the spherical convex surface 14. In other words, the sliding contact cylinder 2
Numeral 2 is attached to the spherical convex portion 12 of the shaft fitting 10 so as to be slidable on a spherical surface.

Further, in this embodiment, on the inner peripheral surface of the sliding contact cylinder 22, a concave groove 28 extending continuously in the axial center portion in the circumferential direction, and five concave grooves extending continuously in the axial direction are provided. A groove 29 is provided, and a lubricating oil reservoir is formed between the groove 28 and the spherical convex portion 12 of the shaft fitting 10.

The material of the sliding contact cylinder 22 is as follows.
Although a low friction synthetic resin such as polyacetal will be employed, an oil-containing resin or the like is also preferably used. In addition, if low friction fibers such as Teflon cloth are arranged on the inner peripheral surface of the sliding contact cylindrical body 22 so as to obtain low friction properties, various fiber-reinforced synthetic resins can be adopted. Becomes

Further, on both sides in the axial direction of the sliding contact cylindrical body 22, there are provided stoppers 30 each having a substantially annular shape. Each of these stoppers 30, 30 has an outer peripheral surface formed with an outer diameter slightly larger than the outer diameter of the sliding contact cylinder 22, and an inner peripheral surface thereof having a taper of the sliding contact cylinder 22. The tapered inner peripheral surface 31 has an inclination angle corresponding to the outer peripheral surface 27. The stoppers 30 are inserted from both sides in the axial direction of the sliding cylinder 22, and the tapered inner peripheral surface 31 abuts against the tapered outer peripheral surface 27 of the sliding cylinder 22. It is arranged in a state of being hampered.

Furthermore, these stoppers 30, 30 are fitted and fixed on the outer peripheral surface thereof to the inner peripheral surface of the small diameter portion 18 of the race metal fitting 16, respectively. Also,
Under such a fixed state, the sliding contact cylinder 2 not having a tapered surface
A minute gap is formed between the outer peripheral surface of the second and the inner peripheral surface of the race bracket 16.

Thus, the sliding contact cylinder 22 is fixedly attached to the race fitting 16 via the pair of stoppers 30, 30 while being sandwiched between the pair of stoppers 30, 30. That is, in the sliding contact cylindrical body 22, since the contact surface with the stoppers 30, 30 is a tapered surface, the axial direction and the axis perpendicular direction ( In the radial direction), the clamping force of the race fitting 16 can be effectively exerted. Further, thereby, the race fitting 16 is connected to the shaft fitting 10 via the sliding contact cylinder 22 so as to be slidable on a spherical surface.

By the way, as described above, the sliding contact cylinder 22 is
When attaching to the race fitting 16 via the stoppers 30, 30, it is desirable to use a method as shown in FIGS. 5 and 6.

That is, first, separately prepared shaft fitting 10, sliding contact cylinder 22, and stoppers 30, 30, and sleeve-shaped tubular fitting 32 for forming race fitting 16 are prepared. Then, after the sliding contact cylindrical body 22 is extrapolated to the spherical convex portion 12 of the shaft fitting 10, FIG.
As shown in FIG. 2, a shaft jig 10 is connected to a cylinder jig 3 by a drawing jig for performing a drawing process on the cylinder bracket 32.
Set it so that it is located coaxially in 2.

Next, the stoppers 30, 30 are extrapolated from both sides in the axial direction of the sliding contact cylinder 22 set on the drawing jig, and the tapered inner peripheral surface 31 is respectively formed on the tapering inner periphery 31 of the sliding contact cylinder 22. It is placed in contact with the outer peripheral surface 27. Furthermore,
By applying an urging force in the axial direction to each of the stoppers 30 by an urging means 34 such as a coil spring, the tapered inner peripheral surface 31 of the stopper 30 is moved to the tapered outer periphery of the sliding contact cylinder 22. The surface 27 is brought into contact with and held by a predetermined urging force.

Then, under such a condition, as shown in FIG. 6, the cylindrical fitting 32 is subjected to a drawing process to form the lace fitting 16. That is, at the same time as the drawing process, the outer peripheral surfaces of the stoppers 30, 30 are fitted and fixedly attached to the inner peripheral surface of the small-diameter portion 18 of the race bracket 16. .

That is, according to such an assembling method,
Regardless of the dimensions of the sliding cylinder 22 and the stoppers 30, 30,
The stoppers 30, 30 can be brought into contact with the sliding contact cylinder 22 with a substantially constant contact force, so that a manufacturing dimensional error or the like of the sliding contact cylinder 22 or the stoppers 30, 30 can be reduced. Can be advantageously absorbed. In other words, even if there is an axial or radial manufacturing dimensional error in the sliding contact cylinder 22 or the stoppers 30, 30, the sliding contact cylinder 22 is moved in the axial and radial directions by the race fitting 16. It is possible to support with a substantially constant clamping force in the direction, and thereby, variations in the axial and radial pressures (supporting pressures) exerted on the sliding contact cylinder 22 at the time of assembling, and hence the sliding. The variation in the surface pressure exerted between the moving surfaces can be reduced as much as possible, and stable sliding performance can be advantageously exhibited.

In such an assembling method, in order to advantageously obtain the fixing force of the fastener 30 to the race metal 16, for example, the metal fastener 30 is made higher than the race metal 16 by carburizing and quenching. Hardening or, in addition, a projection or the like is formed on the outer peripheral surface of the stopper 30 or knurling is performed, whereby the outer peripheral edge of the stopper 30 is drawn when the lace 16 is drawn. It is effective to make the lace fitting 16 bite.

In the case where the metal fittings 30 are engaged with the metal fittings 16 as described above, the outer peripheral surface of the sliding contact cylinder 22 and the metal fittings 1 are also fitted after the metal fittings.
6 so that a slight gap can be formed between the inner peripheral surface of
The outer diameter of the sliding cylinder 22 is set.

Thus, in the spherical sliding type bush having the above-described structure, one member to be vibration-isolated and connected to the inner hole 36 of the shaft fitting 10 is inserted and fixed. The lace fitting 16 is fixed by being press-fitted and fixed to a mounting hole provided in the other member to be vibration-isolated and connected between the members to be vibration-isolated. As a result, the two members are connected so as to be slidable on a spherical surface.

Accordingly, in the spherical sliding type bush having the above-described structure, the lace fitting 16 is drawn in the radial direction and fitted to the outer peripheral surfaces of the stoppers 30, 30, whereby the lace fitting is provided. Since the sliding contact cylindrical body 22 is assembled to the sliding contact member 16, no axial and radial pressing force is applied to the sliding contact cylindrical body 22 during such assembling. Variations in the sliding performance due to the pressing force can be completely prevented.
The stabilization of the sliding performance of the product can be achieved very effectively.

According to the above-described assembling method, the axial and radial manufacturing dimensional errors of the sliding contact cylinder 22 and the stoppers 30, 30 can be effectively absorbed. The dimensional tolerances of these members can be set relatively large while the stable sliding performance is ensured, thereby facilitating the production and reducing the production cost.

Moreover, the race fitting 16 of the spherical sliding bush has a structure in which the sliding contact cylindrical body 22 is held at the small diameter portion 18, and the press fitting into the mounting hole is exclusively performed by the large diameter portion. 20 and 20, the pressure applied to the sliding contact cylinder 22 by the diameter reduction force applied when the race fitting 16 is pressed into the mounting hole can be reduced as much as possible. Thus, an increase in surface pressure between the sliding surfaces due to such press-fitting operation can be effectively prevented, so that the desired sliding performance can be advantageously exhibited.

Although the embodiment of the present invention has been described in detail, this is a literal example, and the present invention is not construed as being limited to such a specific example.

For example, the inclination angle and the size (length in the axial direction) of the tapered outer peripheral surface of the sliding contact cylinder are appropriately determined according to the load characteristics in the axial direction and the direction perpendicular to the axis required for the bush. , To be determined and not to be limited.

Further, in the above embodiment, the sliding contact cylinder 22 having the slit 26 extending in the axial direction at one location on the circumference.
However, in the present invention, the shaft fitting 10
It is possible to adopt various types of sliding contact cylinders that can be extrapolated to the spherical projection 12.

More specifically, as the sliding contact cylindrical body, a plurality of slits extending from one end in the axial direction by about half the length in the axial direction at a plurality of positions on the circumference, or a plurality of slits in the axial direction or A structure composed of two or more divided bodies divided in a direction perpendicular to the axis may be advantageously employed.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, various changes, modifications, improvements and the like can be implemented in an embodiment,
It goes without saying that all such embodiments are included in the scope of the present invention, without departing from the spirit of the present invention.

[0036]

As is apparent from the above description, in the spherical sliding type bush having the structure according to the present invention, the sliding contact cylinder is supported by the race fitting via the stopper. In addition, since the mounting of the stopper to the race is performed by a radial fitting operation, the action of the pressing force on the sliding cylinder during the mounting is prevented as much as possible. Therefore, the variation in the sliding performance due to the pressing force can be avoided, and the stability of the sliding performance of the product can be achieved.

Further, according to the method of the present invention, the contact pressure at the contact surface between the stopper and the sliding contact cylinder, and consequently, the surface pressure between the sliding surfaces between the sliding contact cylinder and the shaft fitting, Regardless of the manufacturing dimensional error in the axial direction and the direction perpendicular to the axis of each member, it can be made substantially constant, so that variations in sliding resistance due to such manufacturing dimensional errors can be avoided, and the sliding performance of the product can be avoided. Can be achieved more effectively, and since relatively large dimensional tolerances are allowed for each member, simplification of manufacturing and reduction of manufacturing cost can be achieved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a spherical sliding type bush as one embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a longitudinal sectional view showing a sliding cylinder used in the spherical sliding type bush shown in FIG. 1;

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is an explanatory view showing one manufacturing process of the spherical sliding type bush shown in FIG. 1;

FIG. 6 is an explanatory view showing another manufacturing process of the spherical sliding type bush shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Shaft fitting 12 Spherical convex part 14 Spherical convex surface 16 Lace fitting 18 Small diameter part 20 Large diameter part 22 Sliding contact cylinder 24 Spherical concave surface 26 Slit 27 Tapered outer peripheral surface 30 Stopper 31 Tapered inner peripheral surface 34 Urging means

Claims (2)

(57) [Claims] 1. A cylindrical lace fitting is disposed on a shaft fitting having a spherical convex surface at an intermediate portion in the axial direction so as to be located at a predetermined distance outside the spherical convex surface. The spherical sliding type bush, wherein the spherical convex surface of the shaft fitting is slidably held through a sliding contact cylindrical body having a spherical concave surface slidably fitted to the spherical convex surface. The outer peripheral surfaces on both sides in the axial direction of the contact cylinder are each a tapered outer peripheral surface whose diameter is reduced toward the outer side in the axial direction, and have a tapered inner peripheral surface corresponding to each of the tapered outer peripheral surfaces. While a pair of annular stoppers having an outer diameter larger than the sliding cylinder body are arranged in contact with the tapered outer peripheral surface, the lace fitting is reduced in diameter at an intermediate portion in the axial direction over a predetermined length. Cylindrical shape with a step By fixing the outer peripheral surface of each of the stoppers to the portion, the sliding contact cylindrical body is pressed against the race fitting in the axial direction and the direction perpendicular to the axis via the stoppers. A spherical sliding bush characterized by being supported. 2. A step of preparing a shaft fitting having a spherical convex surface at an axially intermediate portion, wherein the inner peripheral surface is a spherical concave surface slidably fitted to the spherical convex surface, while the outer peripheral surface has a shaft. Direction both sides, respectively,
A step of extrapolating and disposing a sliding contact cylindrical body having a tapered outer peripheral surface whose diameter decreases as going outward in the axial direction on the outer peripheral surface of the spherical convex surface of the shaft fitting; A pair of annular stoppers having a tapered inner peripheral surface corresponding to the outer peripheral surface and having an outer diameter larger than the sliding contact cylindrical body are arranged on each tapered outer peripheral surface of the sliding contact cylindrical body. For the fastener,
A step of applying a predetermined urging force from the outside in the axial direction to abut against the tapered outer peripheral surface of the sliding cylinder, externally disposing a cylindrical race fitting outside the shaft fitting,
The intermediate portion in the axial direction is drawn down over a predetermined length, and the lace fitting is fitted and fixed to the outer peripheral surface of each of the stoppers. And a step of squeezing and supporting in the axial direction and the direction perpendicular to the axis via the stoppers.