JPH088368Y2 - Drive shaft - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a drive shaft, in particular, a drive shaft capable of easily adjusting rotational balance.

[Conventional technology]

Drive shafts (propeller shafts) of automobiles or drive shafts for rolling rolls of rolling mills that transmit rotational torque from a drive unit to a driven unit are partly cut, processed with precision, heat-treated, assembled into parts, etc. This often causes an imbalance in the rotational balance.

When the drive shaft is rotated in a state where the rotational balance is distorted, vibration may occur and unexpectedly excessive stress may be generated inside. Therefore, various methods for adjusting the rotational balance of the drive shaft have been conventionally devised. For example, a drive shaft with a balance plate welded around the outer circumference welded (Actual No. Sho 56-139044), a drive shaft with a chip-shaped balance weight screwed to the outer circumference with screws, and the body of the rotating body. There is known a drive shaft (Japanese Unexamined Patent Publication No. 59-110942) and the like, which has a resin layer that is fixed to the peripheral surface of the rotor in an annular shape and is scraped off according to the amount of unbalance when the balance of the rotor body is corrected.

[Problems to be solved by the device]

Of the conventional drive shafts that have been able to adjust the rotational balance, it is necessary to weld or scrape a new balance weight on the drive shaft if further correction is required after the balance adjustment. There is a problem that it is necessary to remove it from the drive shaft many times and cut it, and the drive shaft has to form an extra annular resin layer around the shaft and repeat cutting until rotation balance is taken, etc. Adjustment of the rotation balance requires time and labor because the cutting process and the adjustment are repeated. The present invention has been made in order to solve such a problem, and an object thereof is to provide a drive shaft capable of easily, quickly and accurately adjusting the rotational balance of the drive shaft.

[Means for solving the problem]

That is, in order to solve the above problems, the present invention forms an annular groove having a wide bottom on the surface of a drive shaft that is interposed between a drive device and a driven device and transmits rotational torque. At the same time, the annular groove is formed of a metal piece having an arcuate longitudinal section and its width is slightly narrower than the width of the annular groove on the inlet side. Move the balance weight in the circumferential direction by engraving the female screw for screwing the male screw to the middle of the inside and opening the slit communicating with each female screw in the circumferential direction and further roughening the side surface. It is characterized by being inserted freely.

[Action]

If the drive shaft is the above means, the balance weight inserted in the annular groove can be moved in the circumferential direction to adjust the rotational balance. When the rotation balance is achieved, the tip of the male screw is abutted against the lower end of the female screw, and when it is further screwed in, the double legs on both sides of the slit open further due to the so-called wedge effect, which causes the double legs to form an annular shape. The balance weights can be pressed into the side walls of the grooves to tighten the balance weights in these annular grooves. In this case, since the side wall of the balance weight is knurled or roughly cut, the friction coefficient between the side wall of the balance weight and the side wall of the annular groove is large, and therefore the movement in the circumferential direction is also restricted. In this way, movement of the balance weight in the circumferential direction is restricted, and even if centrifugal force acts during rotation, the annular groove is dovetail-shaped, so that it is possible to reliably prevent the balance weight from protruding to the outside.

〔Example〕

Specific embodiments of the present invention will be described below with reference to the drawings.

FIG. 6 is a side view including a partial axial direction sectional view of the drive shaft 1 that transmits rotational torque from the torque converter to the speed reducer, and FIG. 7 is a sectional view taken along the line XX of FIG. The drive shaft 1
Is a driving side fitting yoke 2 connected to a power source (not shown), a universal joint 3 for aligning one end of which is connected to the fitting yoke 2, and a driving side connected to the universal joint 3. A driven side shaft 5 integrally rotatably connected via a ball B between the shaft 4 and the drive side shaft 4, and a universal joint 6 for centering connected to the driven side shaft 5. , A fitting yoke 7 on the reducer side connected to the other end of the universal joint 6. As shown in FIG. 7, the drive-side shaft 4
Also, a plurality of recessed ridges 41, 51 facing each other and extending in the axial direction are formed on the driven side shaft 5, and a plurality of balls B are interposed in these recessed ridges 41, 51, whereby the drive side shaft 4 and The driven-side shaft 5 forms a kind of spline connection and is also capable of relative movement in the axial direction.

In the drive shaft 1 having the above structure, annular grooves 42 and 52 are formed along the outer circumferences of the drive-side shaft 4 and the driven-side shaft 5, respectively, near the ends thereof. These annular grooves 4
At least two balance weights 8 are inserted in 2, 2 so as to be movable in the circumferential direction.

1 (a) and 1 (b) are perspective views of the balance weight 8, and FIG. 2 is a sectional view of the balance weight 8 (also an enlarged view of P part in FIG. 6). The annular grooves 42 and 52 are the bottom
The sides of 42a and 52a are formed in a dovetail shape and gradually widened.
The balance weight 8 is a metal piece having an arcuate cross section in the longitudinal direction, and its width D is the width W on the inlet side of the annular grooves 42 and 52.
It is formed to be slightly narrower than the width. Then, at the position of distance E from the end, female screw from the upper surface to the middle of the inside
81 are threaded, and male screws 9 such as a holset bolt are screwed into these female screws 81. Further, the balance weight 8 is formed with a slit 82 which communicates with each of the female screws 81 from the outside and is opened in the circumferential direction of the annular grooves 42, 52. Therefore, the both sides of the slit 82 become the double leg portions 83, 83 and can be expanded. Next, both side surfaces 84 and 85 of the balance weight 8 are roughened by rough cutting to increase the friction coefficient. In this case, the roughenings on both side surfaces 84 and 85 may be processed so that a large number of protrusions are formed on the surface as shown in FIG. 1 (a), or as shown in FIG. It may be processed so that it becomes a right angle direction. Further, when the knurling is performed, the knurling may be crocheted or flat.

The balance weight has the above-described shape. When the tip end of the male screw 9 is abutted against the lower end portion 81a of the female screw 81 and further screwed in, the so-called wedge effect causes a slit, as shown in FIG. The two legs 83, 83 on both sides of 82 are opened further, which allows the two legs 83, 83 to be attached to the side walls of the annular grooves 42, 52.
The balance weight 8 can be tightly attached to these annular grooves 42 and 52 by being pressed against the 42b and 52b. In this case, both side surfaces 84 and 85 of the balance weight 8 are knurled or roughened (rough cut) and have a large friction coefficient with the side wall of the annular groove, so that movement in the circumferential direction is also restricted.

In this way, the balance weight 8 is restricted from moving in the circumferential direction, and is prevented from jumping out even if centrifugal force during rotation acts. In particular, since the annular grooves 42, 52 are dovetail-shaped, it is possible to reliably prevent the balance weight 8 from protruding.

Next, a method of adjusting the rotational balance of the drive shaft 1 according to the present invention will be described with reference to FIGS.

First, with the balance weight 8 removed from the annular grooves 42 and 52, a lightly balanced portion A on the circumference of the drive shaft 1 is marked by a balance measuring device. Next, the annular groove 42,
Two balance weights 8 are inserted into each of the 52, and the balance weights 8 are arranged at both sides of the mark and the male screw 9 is screwed in to temporarily fix each balance weight 8 to that position (see FIG. 3). In this state, the balance is measured, and if not balanced, each balance weight 8 is moved to the side of heavy balance by the same angle α (FIG. 4). After that, the above operation may be repeated until the balance is obtained. If the two balance weights 8 alone cannot achieve rotational balance, the balance weight 8 may be additionally inserted in the mark A portion and the same adjustment as described above may be repeated (see FIG. 5).

As described in detail above, in the drive shaft 1 according to the present invention, the balance weight 8 is moved along the annular grooves 42 and 52,
The rotation balance can be adjusted simply by tightening or loosening the male screw 9. In this case, the rotation balance can be adjusted very easily and quickly because the balance weight 8 is locked and unlocked.
Moreover, fine adjustment of the rotation balance is possible, so that the adjustment can be performed accurately.

In the drive shaft 1 according to the present invention, the case where the annular grooves 42 and 52 are on the dovetail groove has been described, but the shape of the groove can be applied to a T-shaped groove having a wide bottom. Further, the female screw 81 of the balance weight 8 and the male screw screwed into the female screw 81 may be a taper screw. Further, the drive shaft according to the present invention can be widely applied not only to a drive shaft of a pressure contact roll of an automobile or a rolling mill but also to a drive shaft interposed between a rotary drive device and a driven device to transmit a rotary torque. Of course.

[Effect of device]

Since the drive shaft according to the present invention is configured as described above in detail, the balance weight is moved along the annular groove,
The rotation balance can be adjusted very easily and quickly only by the operation of locking. Further, the balance adjustment operation is performed only by tightening or loosening the male screw, and since the fine adjustment of the rotation balance is possible, the adjustment is extremely accurate.

[Brief description of drawings]

FIG. 1 is a perspective view of a balance weight used in the drive shaft of the present invention, and FIG. 2 is a sectional view of the balance weight (6th embodiment).
FIG. 3 is an explanatory view showing a method for adjusting the rotational balance, and FIG. 6 is a partial axial sectional view of the drive shaft for transmitting the rotational torque from the torque converter to the speed reducer. A side view including FIG. 7 is a cross-sectional view taken along the line XX in FIG. 1 ... driving shaft, 4 ... driving side, 5 ... driven side shaft 42,52 ... annular groove 42b, 52b ... annular groove side wall 8 ... balance weight, 81 ... female screw 82 ... slit, 83 ... double leg 84,85 ... Balance weight side surface 9 ... Male screw

Claims (1)

[Scope of utility model registration request] 1. A drive shaft, which is interposed between a drive device and a driven device and transmits rotational torque, has an annular groove having a wide bottom portion formed on the surface of the drive shaft, and the annular groove has a longitudinal direction. A metal piece having a circular arc-shaped cross-section, the width of which is slightly narrower than the width of the annular groove on the inlet side, and a male screw is screwed from one end to a predetermined position from the upper surface to an intermediate part inside. A balance weight, which is formed by opening a slit communicating with each of the internal threads in the circumferential direction and further roughened the side surface, is movably inserted in the circumferential direction. Drive shaft to drive.