JP3178254B2 - How to correct the connecting shaft balance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for correcting the balance of a connecting shaft.

[0002]

2. Description of the Related Art As a conventional method of correcting the balance of a connecting shaft, a procedure described in Japanese Patent Application Laid-Open No. 4-160333 is known. This is a method for correcting the propeller shaft on-the-car balance. First, the propeller shaft (connecting shaft) is adjusted so that the unbalance amount becomes 0 gcm. Thereafter, the balance is further adjusted with the propeller shaft attached to the vehicle.

[0003]

However, since the propeller shaft has a play due to a spline, a bearing or the like at a joint portion (connecting portion), the balance changes depending on the direction of the play. For this reason, even when the balance is corrected with the propeller shaft alone and the vehicle mounted, the amount of unbalance cannot be suppressed below the amount of unbalance caused by the change in the play direction. In addition, since the direction of the play is different every time the measurement is performed, a stable measurement result cannot be obtained.

[0004]

According to the first aspect of the present invention, there is provided a connecting shaft connected by at least two or more connecting portions having play, wherein two ends are provided at both ends thereof. In a method of correcting the balance of a connecting shaft that couples two rotating bodies and transmits rotational power between the two rotating bodies, as a first procedure, the connecting shaft is provided at both ends of the plurality of connecting portions of the connecting shaft. The part between the connecting parts is unbalanced, and then, as a second procedure, the part of the part on the side connected to the rotating body rather than the connecting parts at both ends of the connecting shaft,
The balance in the circumferential direction opposite to the direction of the unbalance is adjusted by adjusting the mass so as to cancel the unbalance.

In order to solve the above-mentioned problem, in the method for correcting the balance of the connecting shaft according to the second aspect of the present invention, the first step is performed in a state where the rotating body is not connected to the connecting shaft. The second procedure was performed in a state where the rotating body was connected to the connecting shaft. In order to solve the above-mentioned problem, in the connecting shaft balance correcting method according to claim 3 of the present invention, the connecting shaft and at least one of the rotating members are connected by a plurality of bolts,
In the first procedure, the amount of unbalance is a certain amount, and the direction of the unbalance is a direction connecting the rotation center of the connecting shaft and the mounting position of the bolt for connecting the rotating body of the connecting shaft. In the second procedure, the first procedure is performed at a position where the bolt for connecting the rotating body of the connecting shaft, which is on the opposite side to the direction of the imbalance applied in the first procedure, is attached to the first procedure. A mass bolt having a mass corresponding to a certain amount of imbalance indicated by “” is used.

[0006]

According to the method for correcting the balance of the connecting shaft according to the first aspect of the present invention, in the first step, the portion between the connecting portions at both ends of the connecting shaft is imbalanced.
The direction of the play is always constant, the result of the balance measurement is stabilized, and the balance correction can be completed in a short time. On the other hand, in the second procedure, the mass of the portion outside the connecting portion at both ends of the connecting shaft in the circumferential direction opposite to the direction of the unbalance is adjusted so that the unbalance is canceled. Therefore, the influence of the imbalance given in the first procedure can be avoided. Moreover, the portion between the connecting portions at both ends of the connecting shaft,
In other words, unbalanced areas within the range where play is present are used to make the direction of play always constant, and adjust the mass located outside the connection part at both ends of the connecting shaft, that is, outside the range where play is present In order to cancel the above-mentioned unbalance, no matter how many connection parts with play are present between both ends of the connecting shaft, the above-mentioned unbalance should be achieved only in one place common to each connection part. In addition, only one mass needs to be adjusted to cancel this imbalance, and even if there are any number of connection parts with play between both ends of the connecting shaft, the connecting shaft can be inexpensively balanced at the same cost. Corrections can be made.

In the method for correcting the balance of the connecting shaft according to the second aspect of the present invention, the first procedure is performed in a state where the connecting shaft and the rotating body are not connected to each other. When workability is poor, balance correction work becomes easy. According to a third aspect of the present invention, in the method for correcting the balance of the connecting shaft, the second step is for connecting the rotating body of the connecting shaft on the side opposite to the direction of the unbalance applied in the first step. A mass bolt having a mass corresponding to a certain amount of imbalance applied in the first procedure than the other bolts is used at the mounting position of the bolt, so that the connecting shaft and the rotating body are connected using the mass bolt. As a result, the balance is automatically corrected without performing measurement and adjustment after the rotating bodies are combined.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. In this embodiment, a case will be described in which the present invention is applied to on-the-car balance of a propeller shaft. FIG. 2 shows a propeller shaft 1 as a connecting shaft.
FIG. 3 is a view of the propeller shaft 1 as viewed from the right side of the figure. A differential gear and a transmission (not shown) are attached to both ends of the propeller shaft 1 as rotating bodies. At one end of the propeller shaft 1, a flange 2 for attaching a differential gear is provided.
A transmission mounting portion 3 is provided at the other end, and a sleeve joint 4 is provided at an intermediate portion together with the universal joints 2A, 3A, 4A. Here, universal joints 2A, 3A, 4A
In the propeller shaft 1, the gap between the joint 3A and the joint 2A at both ends is the range in which the backlash is present.

Hereinafter, the balance correcting method of the present invention will be described with reference to the flowchart of FIG. First, as a first procedure, the unbalance correction is performed on the propeller shaft alone. Here, the balance piece is attached to the propeller shaft so that the unbalance amount is 20 gcm, and the unbalance direction is the direction connecting the center of the propeller shaft and the hole for fastening the bolt of the flange (the direction of arrow A in FIG. 3). To correct the imbalance. A mark is attached to the flange 2 on the propeller shaft after the unbalance correction so that the direction of the unbalance can be recognized.

Next, as a second procedure, the propeller shaft whose imbalance correction has been completed by itself is mounted on a vehicle. Here, when attaching the differential gear and the propeller shaft, a mass bolt having a mass of 20 gcm larger than other bolts is used for a bolt fastening hole (B in FIG. 3) on the opposite side to the unbalance direction. To conclude. As a result, the unbalance of the propeller shaft alone is canceled by the mass bolt, and the amount of unbalance on the car becomes almost 0 gcm.

As described above, in the above-described embodiment, when the unbalance of the propeller shaft alone is corrected, the direction of the play is always constant because the unbalance is left. In addition, in the vehicle mounting state, the mass bolt is attached to the flange 2 outside the range where the play is present, so that the unbalance between the joint 2A and the joint 3A where the play is present is
Since it is kept at 20 gcm, the direction of play is always kept constant, so that the amount of on-the-car imbalance does not change. In addition, when adjusting the unbalance of a single unit, the unbalance amount was adjusted and the direction of the unbalance was set to the bolt mounting hole direction.When mounting the vehicle, the unbalance amount was almost 0 gcm by using a mass bolt equivalent to the unbalance amount of the single unit. Therefore, adjustment after mounting the vehicle body is not required, and workability is improved.

[0012]

According to the method for correcting the balance of the connecting shaft according to the first aspect of the present invention, since the direction of the play of the connecting shaft is always constant, the measurement result of the balance is stabilized, and the correcting time can be reduced. . Further, a change in balance due to a change in the play direction can be prevented. In addition, to adjust the mass located outside the connecting portion at both ends of the connecting shaft, that is, the mass located outside the range where the play is present, to cancel the above-described imbalance, the influence of the imbalance may be avoided. it can. Further, as described above, when the direction of the backlash is always constant, the portion between the connecting portions at both ends of the connecting shaft, that is, the portion within the range where the backlash is present is imbalanced to achieve the object, and When canceling the unbalance as described above, the connection portion having a play is connected to the connection shaft to adjust the mass located outside the connection portion at both ends of the connection shaft, that is, outside the range where the play is present, to achieve the purpose. No matter how many pieces exist between both ends, only one location common to each connection is required to apply the imbalance, and only one location needs to be adjusted to cancel this imbalance. Regardless of the number of connecting portions having between the two ends of the connecting shaft, the balance of the connecting shaft can be corrected inexpensively at the same cost.

In the method for correcting the balance of the connecting shaft according to the second aspect of the present invention, the work after mounting the rotating body of the connecting shaft is performed, thereby improving the workability. Further, in the connecting shaft balance measuring method according to the third aspect of the present invention, when the connecting shaft is connected to the rotating body, the balance of the connecting shaft is automatically corrected, so that workability is improved.

[Brief description of the drawings]

FIG. 1 shows the correction method of the present invention.

FIG. 2 shows a propeller shaft to which the present invention is applied.

FIG. 3 is a propeller shaft to which the present invention is applied.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Propeller shaft, 2 ... Flange, 3 ... Transmission mounting part 4 ... Sleeve joint, 2A ... Universal joint 3A ... Universal joint, 4A ... Universal joint

Claims (3)

(57) [Claims] 1. A connecting shaft connected by at least two or more connecting portions having play, wherein two rotating bodies are connected to both ends thereof, and rotational power is transmitted between the two rotating bodies. In the method of correcting the balance of the connecting shaft, as a first procedure, an unbalance is applied to a portion between the connecting portions at both ends of the plurality of connecting portions of the connecting shaft. Then, as a second procedure, The mass of the part on the side connected to the rotating body rather than the connection part at both ends of the connection shaft, the mass in the circumferential direction opposite to the direction of the unbalance,
A method of correcting the balance of the connecting shaft, wherein the balance is corrected by adjusting the unbalance. 2. The method according to claim 1, wherein the first step is performed in a state where the rotating body is not connected to the connecting shaft, and the second step is performed in a state where the rotating body is connected to the connecting shaft. The method for correcting the balance of a connecting shaft according to claim 1, wherein: 3. The connecting shaft and at least one of the rotating bodies are connected by a plurality of bolts. In the first procedure, the unbalance amount is a certain amount, and the direction of the unbalance is The direction connecting the rotation center of the connecting shaft and the mounting position of the bolt for connecting the rotating body of the connecting shaft is set in a direction opposite to the direction of the unbalance applied in the first step. A mass bolt having a mass equivalent to a certain amount of imbalance applied in the first procedure than the other bolts is used at the mounting position of the bolt for connecting the rotating body of the connecting shaft. 3. The method for correcting the balance of a connecting shaft according to claim 2.