JPS59175624A - Outer race of barfield joint - Google Patents

Abstract

PURPOSE:To reduce measuring points for the dia. of bitwin ball by such a construction that locus of a rolling ball moving in a ball rolling groove follows a circular arc shaped locus in the normal range of usage of the Barfield joint and displaces outward viewed in the radial direction in ranges outside the normal range. CONSTITUTION:The circular arc shaped line 10 in the attached diagram shows the ball rolling locus, and the rolling groove 5 in the normal operating range a accompanying a vertical motion of the wheel ring etc. of the outer race 2 is a regular circular arc shaped locus. In range angles b, c exceeding the normal operating range a, the ball rolling groove 5 is so formed so to become loci 11, 12 displaced outward viewed in the radial direction from the regular circular arc shaped locus 10 for rolling of the ball. Thereby only measurement of the normal operating range angle a is sufficient to determine the minimum of the dia. of bitwin ball, to cause reduction of the measuring extent greatly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an outer race of a Barfield joint used in a connection part of a drive shaft of a vehicle such as an automobile.

1 and 2 show a conventionally known Burfield joint. Barfield joint is ball 1,
It is composed of an outer race 2, an inner race 3, and a cage 4, and the inner race 2 and the inner race 3 are connected to each other.
A ball rolling groove 5 in which each ball 1 rolls is provided on the outer surface of the
．． 6 is provided. The balls 1 are held in a cage 4 disposed between the outer race 2 and the inner race 3, and are fitted into ball rolling grooves 5.6 of the outer race 2 and the inner race 3, respectively. Note that six combinations of balls 1 and ball rolling grooves 5.6 are arranged at equal intervals on the circumference.

Conventionally, the ball transfer groove 5 provided in the above-mentioned outer race 2 determines the locus on which the ball 1 rolls,
In order to ensure constant velocity of the joint and to facilitate joint assembly, the joint was generally finished with high precision by cutting and grinding. The shape of the ball rolling groove 5 of the outer race 2 is such that the ball 1 comes into contact with the bottom of the ball rolling groove 5 as shown in FIG. Although the ball 1 is made to come into contact with the side wall surface of the ball transfer groove 5, there are two types.

By the way, forming the ball transfer grooves 5 by cutting and grinding has poor productivity and generally has high manufacturing costs.Recently, the outer race 2 has been manufactured by plastic working using a mandrel or the like. It started to get worse. However, in the case of plastic working, the grinding process cannot produce the ball transfer groove 5 with good precision, so the assembly is sometimes performed by measuring the size of the ball transfer groove 5 of the outer race 2 and adjusting the size accordingly. The size of the ball transfer groove 6 of the inner race 3 was selected and the two were selected and combined to assemble the Barfield joint.

The selected combination of outer lace 2 and inner lace 3 is
This is done as follows. That is, as shown in FIG. 3, the minimum dimension Il of the six ball transfer grooves 5 provided in the outer race 2, between the diagonal ball transfer grooves 5 (this is generally referred to as the bit win ball diameter). Measure the value and adjust it to the minimum bit win ball diameter l,
The overball diameter m of the inner race 3 was selected and combined.

Here, the overball diameter m of the inner race 3 is the fourth
As shown in the figure, the dimension m between each diagonal ball transfer groove 6 of the six ball transfer grooves 6 provided in the inner race 3
It refers to When selecting the inner race 3 for assembly, the selection is made based on the maximum value of the overball diameter m.

In addition, considering the current manufacturing technology, balls 1 with almost the same diameter can be manufactured in large quantities, so when assembling this type of Barfield joint,
All balls 1 having the same diameter are prepared. Therefore, the minimum value of the bit win ball diameter β in the outer race 2 is measured, and assuming that the ball 1 is fitted into the position of the ball transfer groove 5 that has the minimum value of the bit win ball diameter β, the maximum bit win ball diameter β is measured. If you select the inner race 3 that can fit the ball rolling groove 6 at the overball diameter m of the value, all six balls 1 can be placed between the ball rolling grooves 5.6 of the outer race 2 and the inner race 3 with precision. It can be fitted well and can be assembled for transfer.

However, it is very difficult to find the minimum bit win ball diameter in the outer race 2. That is, since there are six ball transfer grooves 5 in the outer race 2 as shown in FIG. 3, there are three bit win ball diameters l even in the planar state shown in FIG. And these three bit win ball diameters! Each time, the entire length of the ball transfer groove 5 shown in FIG. 1 must be measured and the minimum value among them must be determined, which is difficult because there are so many measurement points.

For this reason, measurement points are conveniently specified and the number of measurements is reduced, but in this case, the minimum bit win ball diameter l at that measurement point is not necessarily the true minimum of all. value, so if the minimum value measured at this particular location is greater than the true minimum value, then this measured bit win ball diameter! If the overball diameter m of the inner race 3 corresponding to the above is selected and combined, there will be a problem that the ball 1 cannot be fitted, so the inner race 3 with the appropriate overhaul diameter m will be selected and assembled again. There was an unavoidable annoyance.

In addition, in order to avoid this trouble, it may be possible to set the virtual minimum bit win ball diameter l by adding an appropriate dimension to the measured minimum value, but in this case, the virtual minimum value If it is smaller than the true minimum value, there will be a gap in the fitting between the ball 1 and the ball rolling groove 5.6 when assembled, resulting in the problem of so-called backlash.

Therefore, an object of the present invention is to reduce the measurement points of the bit win ball diameter between the ball rolling grooves of the outer race to be measured for combination with the inner race in the case where the outer race of the Barfield joint is formed by plastic working. Our goal is to provide an outer lace that can be worn.

The structure of the present invention that achieves this object is an outer race of a Barfield joint having an arcuate ball transfer groove formed by plastic working, and the transfer locus of the hole rolling in the ball rolling groove is a barfield joint. The joint has a ball rolling groove which is formed to have an arcuate trajectory in the range of normal use, and to be displaced radially outward from the arcuate trajectory outside the range of normal use. This is the outer lace of the Barfield joint.

As described above, the present invention has the advantage of displacing the ball rolling groove of the outer race outward in the radial direction outside of the normally used enclosing angle of the outer race. The measurement of the minimum value of the bit win ball diameter between the rolling grooves and the rolling grooves is done regardless of the number of G, so the ball's rolling trajectory is formed into a normal round melon shape for regular use. By measuring the ball diameter around the range angle O, the true minimum value of the ball diameter can be found. Normally, the commonly used range angle of a barfield joint is about 30°, which is about half of the total allowable angle, so the measurement range is also halved.As a result, the diameter of the bit win ball can be reduced by half. This is an excellent method that allows you to easily measure the diameter of the bar field joint, as well as easily determine the minimum value of the true and nodwin ball diameter. be effective.

In addition, the present invention is capable of reliably determining the minimum value of the true bi-nodwin ball diameter of the outer race (because it is possible to
It is possible to select the optimal combination of the inner race with the maximum value of 1 and a half, and in the normal use range angle, the fit between the ball 1 and the ball rolling grooves of the inner race and outer race is ensured without play. This allows for accurate fitting. As a result, the durable life of the Barfield joint can be improved.

According to the present invention, if the rolling locus is outside the normal arcuate locus in a range exceeding the commonly used range of the field angle, Because it is considered a ball transfer groove, there is a slight gap in the singing of the banyo dF-ru in this range, so-called "force rotation", but this range is generally used (in vehicles such as cars). If the wheels run up on a curb and fall into a hole, etc., the vehicle's running speed (speed and force) is slow, so there is almost no problem.

Hereinafter, an embodiment of the present invention will be described based on FIG. 7.

In FIG. 7, the arcuate trajectory indicated by the reference numeral 10 is a conventional regular ball transfer trajectory (base circle). In this embodiment, the inner race 3 (not shown in FIG. 7) and the outer race 2 are attached to the vehicle when the zicointo angle is 45 degrees, so the normal vertical movement of the wheels, etc. The normal use range angle a of the outer race 2 is the sum of the opening limit of the outer race 2 of 10° and the rear side of about 20° with respect to the normal y from the center point O (center of the base circle) shown in FIG. It is said to be 30°. Therefore, in this example, this angle of approximately 30° is regularly used! i! At the enclosing angle a, the ball transfer groove 5 is formed to have a regular arcuate trajectory.

In the range angles s and c exceeding the normal use range angle a, the ball rolling grooves 5 are formed to have trajectories 11 and 12 that are displaced radially outward from the normal ball rolling arcuate trajectory 10. According to the results of various experiments conducted by the applicant, the amount of displacement radially outward from the regular arcuate trajectory 10 is 70μ.
It is preferable to set it to m or less. In addition, when the outer race 2 is plastic-processed using a mandrel or the like so as to displace the ball transfer locus outward in ranges s and c other than the normally used angle a, pits may occur near the center position of the ball transfer groove. It has also been found from experimental results that the minimum value of the Winball diameter l is generally measured.

According to the embodiment described above, in any case, in order to find the minimum value of the bi-nodwin ball diameter l, it is sufficient to measure the commonly used range angle a, and the measurement range can be significantly reduced.

Although specific embodiments illustrating the present invention have been described above, the present invention is not limited to such embodiments.
Various embodiments are possible within the scope of the invention.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventionally known Barfield joint, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, Fig. 3 is a sectional view of the outer race, and Fig. 4 is a sectional view of the inner race. FIGS. 5 and 6 are partial sectional views showing how the balls are fitted into the ball transfer grooves of the outer race, and FIG. 7 is a sectional view showing one embodiment of the present invention. Explanation of symbols 2 - Outer race 5 - Ball rolling groove 10 - Regular arcuate locus 11.12 - - Transfer displaced outward in the radial direction Trajectory a-------------------------------------------------(a) a range beyond the commonly used range angle the applicant;
TOYOKUJINOGOU GAISHA

Claims (1)

[Claims] 1. The outer race of a Barfield joint has an arcuate ball rolling groove formed by plastic working, and the transfer locus of the ball rolling in the ball rolling groove is within the normal use range of the Barfield joint. 1. An outer race of a Barfield joint having a ball transfer groove, characterized in that the outer race has a circular arcuate trajectory, and is formed to be displaced radially outward from the arcuate trajectory outside the range of normal use.