CN201739345U - Bowling pin combination type pivoting support with elliptic raceway - Google Patents

Abstract

The utility model discloses a bowling pin combination type pivoting support with an elliptic raceway, which is characterized in that the ball raceway of the bowling pin combination type pivoting support is elliptic, the computing formula of the long half shaft and the short half shaft of the elliptic raceway is shown as follows: in the following formula, a refers to the long half shaft of the elliptic raceway, b refers to the short half shaft of the elliptic raceway, r refers to the curvature radius of a steel ball, and t refers to the ratio of the curvature radius R of the contact point of the raceway and the steel ball and the curvature radius r of the steel ball, namely R to r; and Beta refers to the contact angle of the steel ball and the raceway, the value of the curvature ratio t ranges from 1.01 to 0.12, and the value of contact angle Beta ranges from 30 degrees to 60 degrees. By virtue of the elliptic raceway, under the condition of same raceway quenching hardness, depths of the hardening layers and contact angles, the load-bearing capacity of the bowling pin combination type pivoting support is improved by 33 percent as compared with that of the bowling pin combination type pivoting support with a peach-shaped raceway.

Description

The goalpost combined type pivoting support of elliptic roller track

Technical field

The utility model relates to a kind of goalpost combined type pivoting support with elliptic roller track.

Background technique

Pivoting support is the mechanical necessary important force transfer element that needs to do to turn round relatively, need to bear simultaneously again axial force, radial force, tilting moment between all two-part as the important foundation element of engineering machinery and building machinery.Wherein goalpost combined type pivoting support mainly is made up of outer race, inner race, roller and steel ball, inner race and outer race respectively have a linear raceway of straight horizontal and a ball-track, roller is positioned at the linear raceway of straight horizontal, steel ball is positioned at ball-track, roller by horizontal positioned bears axial force, radial force is born by steel ball, and tilting moment is born jointly by both.It can bear larger axis to power, and it is less that the while can be born certain tilting moment and radial force and sectional dimension again.It mainly is applicable to bears big axial load, certain tilting moment, life requirements height and the main frame that need turn round continuously.But the ball receway pattern of existing goalpost combined type pivoting support is the two centers of circle of two circular arcs for peach shape is, R/r＞1, raceway symmetry up and down.Raceway quenching hardness, depth of hardening zone, raceway radius of curvature and wrapping angle are to influence the bearing capacity of peach shape raceway pivoting support and four important parameters in working life.The raceway quenching hardness is subjected to the restriction of steel ball surface hardness can only be 55～60HRC, and is limited from the effect of this respect raising bearing capacity; As long as depth of hardening zone is deepened depth of hardening zone except meeting improves the quenching cost greater than specified value, can not aspect the raising bearing capacity big effect arranged; Wrapping angle increases the possibility that can increase raceway limit mouth conquassation, also should not improve the bearing capacity of pivoting support by the method that increases wrapping angle; The ratio of raceway radius of curvature R and steel ball radius r is generally 1.04～1.08, and the more little bearing capacity of ratio is big more, but the control difficulty of the more little raceway accuracy to shape of ratio is big more.So under the existing processes condition, can not improve the bearing capacity of pivoting support by the method that reduces the raceway ratio of curvature.

Summary of the invention

Problem to be solved in the utility model provides a kind of goalpost combined type pivoting support with novel raceway, by the raising of raceway bearing capacity, and then the service behaviour and the life-span of improving goalpost combined type pivoting support.

The ball receway pattern of the utility model goalpost combined type pivoting support is oval, and the major semi axis of elliptic roller track, semi-minor axis formula are as follows:

$a=\frac{r\·{\sin }^2\mathrm{\β}\sqrt{t}}{1-t\·{\cos }^2\mathrm{\β}}$

$b=\sqrt{\frac{r^2\·{\sin }^2\mathrm{\β}}{1-t\·{\cos }^2\mathrm{\β}}}$

In the following formula: a---the major semi axis of elliptic roller track;

The semi-minor axis of b---elliptic roller track;

R---steel ball radius of curvature;

The ratio of the radius of curvature R of t---raceway and steel ball point of contact and steel ball radius of curvature r, R/r;

The wrapping angle of β---steel ball and raceway;

Ratio of curvature t span is 1.01～1.12, and wrapping angle β span is 30 °～60 °.

Facts have proved, make peach shape raceway into oval raceway, the raceway accuracy to shape is more easy to control, and because elliptic roller track is the raceway of variable curvature, when wrapping angle changed, the raceway curvature of point of contact was made corresponding change, therefore can improve the contact stress state of steel ball and raceway, improve the raceway bearing capacity, and then improve the service behaviour and the life-span of pivoting support.After adopting elliptic roller track, under the identical situation of raceway quenching hardness, depth of hardening zone and wrapping angle, the bearing capacity of this kind goalpost combined type pivoting support can improve 33% with respect to the bearing capacity of the goalpost combined type pivoting support of peach shape raceway.

Description of drawings

Fig. 1 is the goalpost combined type pivoting support schematic representation of the utility model elliptic roller track;

Fig. 2 is the enlarged diagram of the place of A shown in Fig. 1 elliptic roller track;

Fig. 3 is the raceway shape schematic representation of existing goalpost combined type pivoting support.

Embodiment

From Fig. 1 and Fig. 2 as can be seen, the ball receway pattern of the utility model goalpost combined type pivoting support is designed to ellipse, and the major semi axis of elliptic roller track, semi-minor axis formula are as follows:

$a=\frac{r\·{\sin }^2\mathrm{\β}\sqrt{t}}{1-t\·{\cos }^2\mathrm{\β}}$

$b=\sqrt{\frac{r^2\·{\sin }^2\mathrm{\β}}{1-t\·{\cos }^2\mathrm{\β}}}$

In the following formula: a---the major semi axis of elliptic roller track;

The semi-minor axis of b---elliptic roller track;

R---steel ball radius of curvature;

The ratio of the radius of curvature R of t---raceway and steel ball point of contact and steel ball radius of curvature r, R/r:

The wrapping angle of β---steel ball and raceway;

Ratio of curvature t span is 1.01～1.12, and wrapping angle β span is 30 °～60 °.

For example: when the raceway parameter value of goalpost combined type pivoting support is: the raceway radius of curvature of steel ball radius of curvature r=9.922mm, point of contact and the ratio t=1.04 of steel ball radius of curvature and wrapping angle β=50 °.According to top formula, can obtain major semi axis a=10.412mm, the semi-minor axis b=10.065mm of elliptic roller track.

Facts have proved, make peach shape raceway into oval raceway, the raceway accuracy to shape is more easy to control, and because elliptic roller track is the raceway of variable curvature, when wrapping angle changed, the raceway curvature of point of contact was made corresponding change, therefore can improve the contact stress state of steel ball and raceway, improve the raceway bearing capacity, and then improve the service behaviour and the life-span of pivoting support.After adopting elliptic roller track, under the identical situation of raceway quenching hardness, depth of hardening zone and wrapping angle, the bearing capacity of this kind goalpost combined type pivoting support can improve 33% with respect to the bearing capacity of the goalpost combined type pivoting support of peach shape raceway.

Claims (1)

1. the goalpost combined type pivoting support of an elliptic roller track is characterized in that: the ball receway pattern of this goalpost combined type pivoting support is for oval, and the major semi axis of elliptic roller track, semi-minor axis formula are as follows:

$a=\frac{r\·{\sin }^2\mathrm{\β}\sqrt{t}}{1-t\·{\cos }^2\mathrm{\β}}$

$b=\sqrt{\frac{r^2\·{\sin }^2\mathrm{\β}}{1-t\·{\cos }^2\mathrm{\β}}}$

In the following formula: a---the major semi axis of elliptic roller track;

The semi-minor axis of b---elliptic roller track;

R---steel ball radius of curvature;

The ratio of the radius of curvature R of t---raceway and steel ball point of contact and steel ball radius of curvature r, R/r;

The wrapping angle of β---steel ball and raceway;

Ratio of curvature t span is: 1.01～1.12, and wrapping angle β span is: 30 °～60 °.

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