JP7090876B2 - Manufacturing method of balance weight, rotary shaft with balance weight and rotary shaft with balance weight - Google Patents

Description

The present invention relates to a balance weight, a rotary shaft with a balance weight, and a method for manufacturing a rotary shaft with a balance weight.

In the conventional balance weight, the four corners of the rectangular balance weight are spot-welded to the outer surface of the rotating shaft, and stress relaxation means corresponding to the torsional load generated on the outer surface of the rotating shaft is provided between the welded portions. There are some (see, for example, Patent Document 1). As a result, in the balance weight of Patent Document 1, the shearing force generated between the welded portions is absorbed by the stress relaxation means, and the welded portions are prevented from breaking. Further, in some conventional balance weights, the central positions of the upper edge portion and the lower edge portion of the rectangular balance weight are set as welded portions (joints), and holes are formed between the welded portions (for example). , Patent Document 2). As a result, in the balance weight of Patent Document 2, the space between the two welded portions is cut off by the hole, so that the rigidity against twisting is lowered and the twisting fatigue life is improved.

Jikkenhei 4-71842 Gazette Japanese Unexamined Patent Publication No. 2005-214335

However, even when the balance weights described in Patent Documents 1 and 2 are welded to the rotary shaft, stress due to twisting or the like may be concentrated on the welded portion. This affects the product life of the rotating shaft with a balance weight.

An object of the present invention is to provide a balance weight capable of relieving stress concentrated on a welded portion with a rotating shaft. Another object of the present invention is to provide a rotary shaft with a balance weight, which has an improved product life. Further, another object of the present invention is to provide a method for manufacturing a rotary shaft with a balance weight, which can obtain a rotary shaft with a balance weight with an improved product life.

The balance weight according to the present invention is a balance weight welded to the outer surface of the rotating shaft, and is formed by projecting a part of the contour line of the main body portion and the main body portion in a plan view, at least one overhang. The overhanging portion is a welded portion.
According to the balance weight according to the present invention, the stress concentrated on the welded portion with the rotating shaft can be relaxed.

In the balance weight according to the present invention, the at least one overhanging portion may be two overhanging portions.
In this case, it is possible to relax the stress concentrated on the welded portion with the rotating shaft while stably welding the balance weight.

It is preferable that the balance weight according to the present invention has a connecting portion for connecting the two segments in the main body portion and has a relief structure for releasing the force transmitted to the main body portion.
In this case, the stress concentrated on the welded portion with the rotating shaft can be further relaxed.

In the balance weight according to the present invention, the at least one overhanging portion may be one overhanging portion.
In this case, the stress concentrated on the welded portion with the rotating shaft can be further relaxed.

In the balance weight according to the present invention, the main body portion is preferably a plate-shaped segment.
In this case, the balance weight can be easily manufactured as an integral body by, for example, press working using one plate-shaped member.

The rotary shaft with a balance weight according to the present invention has a rotary shaft and any one of the above balance weights welded to the outer surface of the rotary shaft.
According to the rotary shaft with a balance weight according to the present invention, the product life can be improved.

The method for manufacturing a rotary shaft with a balance weight according to the present invention is a method for manufacturing a rotary shaft with a balance weight by welding a balance weight to the outer surface of the rotary shaft, and the balance weight is any of the above. Using one balance weight, the overhanging portion of the balance weight is welded to the outer surface of the rotating shaft.
According to the method for manufacturing a rotary shaft with a balance weight according to the present invention, it is possible to obtain a rotary shaft with a balance weight with an improved product life.

According to the present invention, it is possible to provide a balance weight that can relieve stress concentrated on a welded portion with a rotating shaft. Further, according to the present invention, it is possible to provide a rotary shaft with a balance weight, which has an improved product life. Further, according to the present invention, it is possible to provide a method for manufacturing a rotary shaft with a balance weight, which can obtain a rotary shaft with a balance weight with an improved product life.

It is a top view which shows the rotary shaft with the balance weight which concerns on 1st Embodiment of this invention to which the balance weight which concerns on 1st Embodiment of this invention is applied. It is a top view which shows the main part of the rotary shaft with a balance weight of FIG. It is a front view which shows FIG. 2A. It is a top view which shows the main part of the rotary shaft with a balance weight which concerns on the 2nd Embodiment of this invention, which applied the balance weight which concerns on 2nd Embodiment of this invention to the rotary shaft of FIG. It is a front view which shows FIG. 3A. FIG. 3 is a plan view showing a main part of a rotary shaft with a balance weight according to a third embodiment of the present invention, in which the balance weight according to the third embodiment of the present invention is applied to the rotary shaft of FIG. It is a front view which shows FIG. 4A. It is a top view which shows the main part of the rotary shaft with a balance weight which concerns on 4th Embodiment of this invention, which applied the balance weight which concerns on 4th Embodiment of this invention to the rotary shaft of FIG. It is a front view which shows FIG. 5A. It is a top view which shows the main part of the rotary shaft with a balance weight which concerns on 5th Embodiment of this invention, which applied the balance weight which concerns on 5th Embodiment of this invention to the rotary shaft of FIG. It is a front view which shows FIG. 6A. It is a top view which shows the main part of the rotary shaft with a balance weight which concerns on a reference example, which applied the balance weight which concerns on a reference example to the rotary shaft of FIG. FIG. 7A is a front view showing FIG. 7A.

Hereinafter, various embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 100 is a rotary shaft with a balance weight according to the first embodiment of the present invention to which the balance weight 10 according to the first embodiment of the present invention is applied. The rotary shaft 100 with a balance weight has a rotary shaft 110 and a balance weight 10 welded (fixed) to the outer surface of the rotary shaft 110. The rotary shaft 110 extends along the axis O. The rotary shaft 110 is rotatable around the axis O. When the rotary shaft 110 is rotated around the axis O, the balance weight 10 keeps the rotational balance stable.

In the present embodiment, the rotary shaft 110 is a propeller shaft that can be used in a power transmission system of a vehicle. In the present embodiment, the rotary shaft 110 is composed of a cylindrical shaft main body 111, an end portion 112 fixed to one end of the shaft main body 111, and an end portion 113 fixed to the other end of the shaft main body 111. ing. In the present embodiment, the ends 112 and 113 of the rotary shaft 110 form a part of the universal joint. The configurations of the ends 112 and 113 of the rotary shaft 110 can be appropriately changed depending on the method of connecting the rotary shaft 110 in the power transmission system.

In the present embodiment, as shown in FIG. 1, two balance weights 10 are fixed to one side of the shaft body 111 of the rotary shaft 110 (in the present embodiment, the front side of the drawing). The two balance weights 10 are fixed at intervals in the direction of the axis O. In the present embodiment, two balance weights 10 are welded to the other side of the shaft body 111 (in the present embodiment, the back side of the drawing) as in the case of one side shown in the drawing (not shown). That is, in the present embodiment, a total of four balance weights 10 are fixed to the rotating shaft 110.

The balance weight 10 shown in FIG. 1 is a balance weight according to the first embodiment of the present invention. As shown in FIGS. 2A and 2B, the balance weight 10 according to the present embodiment has at least one overhanging portion formed by projecting a part of the contour line of the main body portion A and the main body portion A in a plan view. It has B and. The overhanging portion B is a welded portion. Reference numeral 70 indicates a welded portion after welding.

As shown in FIGS. 2A and 2B, in the balance weight 10 according to the present embodiment, the main body portion A is composed of one segment 11. As shown in FIG. 2B, the segment 11 has an outer surface 12 and an inner surface 13. In the present embodiment, as shown in FIG. 2B, the segment 11 is a plate-shaped segment having a thin thickness between the outer surface 12 and the inner surface 13. In the present embodiment, as shown in FIG. 2A, the segment 11 is divided into a contour line L1 extending in the lateral direction and a contour line L2 extending in the longitudinal direction orthogonal to the contour line L1 in a plan view. It is shaped like a rectangle.

In the present embodiment, as shown in FIG. 2B, the segment 11 is curved so as to match the outer surface F of the rotating shaft 110 (in this embodiment, the shaft main body 111) in the axial direction. In the present embodiment, the inner surface 13 of the segment 11 is composed of a mating surface 13a that is mated with the outer surface F of the rotating shaft 110. As shown in FIG. 2B, for example, the mating surface 13a of the segment 11 can be aligned with the outer surface F of the rotating shaft 110 in a state where the balance weight 10 is welded to the rotating shaft 110 in the axial direction.

Further, in the balance weight 10 according to the present embodiment, at least one overhanging portion B is two overhanging portions 14. The two overhanging portions 14 are arranged at positions facing each other with the main body portion A interposed therebetween. As shown in FIG. 2A, in a plan view, the two overhanging portions 14 project a part of the contour line L1 of the segment 11.

As shown in FIG. 2A, the overhanging portion 14 projects from the contour line L1 of the segment 11 along the direction in which the contour line L2 of the segment 11 extends in a plan view. In the present embodiment, as shown in FIG. 2A, the overhanging portion 14 projects in a rectangular shape from the contour line L1 of the segment 11 in a plan view. If each of the two overhanging portions 14 is projected in a rectangular shape as in the present embodiment, a wide welding region (welding area) can be secured. The shape of the overhanging portion 14 can be appropriately selected. For example, the overhanging portion 14 can be projected into a curved shape such as a semicircular shape or a dome shape in a plan view.

In the balance weight 10 according to the present embodiment, two overhanging portions 14 are provided in the segment 11, and each of the overhanging portions 14 is a welded portion. In this case, the welding width (welding length) of the balance weight 10 is the width W14 in the contour line L1 direction of the overhanging portion 14. The width W14 of the overhanging portion 14 is limited to be shorter than the overall width W10 in the contour line L1 direction of the balance weight 10. That is, the weld width is limited to be short by projecting a part of the contour line L1 in the plan view of the segment 11 to form the welded portion 70. In this way, if the welding width of the balance weight 10 is limited to be short, in the state where the balance weight 10 is welded to the rotary shaft 110, the force from the rotary shaft 110 is applied to the welded portions 70 of each of the two segments 11. When relatively applied, specifically, when a torsional force or the like is applied between the welded portions 70, the binding force of the rotating shaft 110 with respect to the balance weight 10 weakens. Therefore, according to the balance weight 10 according to the present embodiment, the stress concentrated on the welded portion 70 can be relaxed.

Further, in the balance weight 10 according to the present embodiment, the overhanging portion B is two overhanging portions 14 as described above. In this case, the stress concentrated on the welded portion 70 with the rotating shaft 110 can be relaxed while the balance weight 10 is stably welded.

By the way, according to the balance weight according to the present invention, as will be described later, the main body A can be provided with a relief structure C for releasing the force transmitted to the main body A.

In FIGS. 3A and 3B, reference numeral 200 is a rotary shaft with a balance weight according to the second embodiment of the present invention. As shown in FIG. 3B, the rotary shaft 200 with a balance weight is obtained by welding the balance weight 20 to the outer surface F of the rotary shaft 110 of FIG. The balance weight 20 is a balance weight according to the second embodiment of the present invention. The balance weight 20 is a modification of the balance weight 10. Hereinafter, the parts substantially the same as those in FIGS. 1 and 2A and 2B have the same reference numerals, and the description thereof will be omitted.

As shown in FIGS. 3A and 3B, in the balance weight 20, the main body A has two segments 11. The two segments 11 are spaced apart from each other. Each of the segments 11 has an outer surface 12 and an inner surface 13, as shown in FIG. 3B. In the present embodiment, each of the segments 11 is a plate-shaped segment having a thin thickness between the outer surface 12 and the inner surface 13, as shown in FIG. 3B. In the present embodiment, as shown in FIG. 3A, the segments 11 are orthogonal to the contour line L3 extending in the longitudinal direction (the short side direction of the balance weight 20) and the contour line L3, respectively, in a plan view. It is formed into a rectangular shape separated by a contour line (longitudinal direction of the balance weight 20) L4 extending in the lateral direction.

In the balance weight 20 according to the present embodiment, as shown in FIG. 3B, each segment 11 is curved so as to match the outer surface F of the rotating shaft 110 (in this embodiment, the shaft main body 111) in the axial direction. It has a mating portion 11a. In the mating portion 11a of each segment 11, the inner surface 13 of the segment 11 is composed of a mating surface 13a that is mated with the outer surface F of the rotating shaft 110. As shown in FIG. 3B, for example, the mating surface 13a of each segment 11 can be aligned with the outer surface F of the rotating shaft 110 in a state where the balance weight 20 is welded to the rotating shaft 110 in the axial direction.

Further, in the balance weight 20 according to the present embodiment, the main body portion A has at least one connecting portion 21 that connects the two segments 11. In the present embodiment, the main body A is composed of two segments 11 and one connecting portion 21. Further, in the present embodiment, the connecting portion 21 is provided as the relief structure C. As shown in FIG. 3B, the connecting portion 21 is a connecting portion that projects in an arch shape outward from the mating surface 13a of each segment 11. Here, the "outside" is the side of the segment 11 from the inner surface 13 to the outer surface 12.

As shown in FIG. 3B, the connecting portion 21 projects in an arch shape from between the two segments 11 and forms a space S between the connecting portion 21 and the rotating shaft 110. Specifically, as shown in FIG. 3B, for example, the inner surface 22 of the connecting portion 21 is placed between the inner surface 22 of the rotating shaft 110 and the outer surface F of the rotating shaft 110 in a state where the balance weight 20 is welded to the rotating shaft 110 in the axial direction. , Forming a space S. That is, as shown in FIG. 2B, the "connecting portion 21 protruding outward from the mating surface 13a of the segment 11 in an arch shape" is rotated with the balance weight 20 in a state where the balance weight 20 is welded to the rotating shaft 110. It is a connecting portion having a shape such that a space S is formed between the shaft 110 and the shaft 110.

Further, in the balance weight 20 according to the present embodiment, as shown in FIG. 3B, the segment 11 has a protruding portion 11b that protrudes together with the connecting portion 21 so as to form a part of the arch shape in the axial direction. Have.

The protruding portion 11b is provided on the connecting portion 21 side of each segment 11. The protruding portion 11b is connected to the connecting portion 21. As a result, in the present embodiment, the connecting portion 21, together with the protruding portions 11b of the two segments 11, protrudes outward from the mating surface 13a of the segments 11 in an arch shape. In other words, in the protruding portion 11b of the segment 11, the inner surface 13 of the segment 11 is composed of a rising surface 13b connecting the mating surface 13a of the segment 11 and the inner surface 22 of the connecting portion 21. As shown in FIG. 3B, for example, the rising surface 13b of the segment 11 rises from the mating surface 13a of the segment 11 toward the inner surface 22 of the connecting portion 21 in the axial direction. As shown in FIG. 3B, for example, the rising surface 13b of the segment 11 forms a space S together with the inner surface 22 of the connecting portion 21 in a state where the balance weight 20 is welded to the rotating shaft 110 in the axial direction. There is.

Further, in the balance weight 20 according to the present embodiment, as shown in FIGS. 3A and 3B, the connecting portion 21 partitions the gap G together with the two segments 11, and the gap G is the notch 23. That is, in this embodiment, the relief structure C is composed of a connecting portion 21 formed by at least one notch 23. The notch 23 extends from the outer surface 12 to the inner surface 13 of each of the two segments 11. In other words, the notch 23 penetrates the balance weight 20.

In the balance weight 20 according to the present embodiment, as shown in FIG. 3A, the two notches 23 are arranged at two positions sandwiching the connecting portion 21 in a plan view. As shown in FIG. 3A, the two notches 23 are arranged so that the tips 23e of the notches 23 face each other on both sides of the balance weight 20 in a plan view. In the present embodiment, the connecting portion 21 is located between the two notches 23 on the tip 23e side, and is a connecting portion narrower than the overall width W20 in the contour line L3 direction of the segment 11. In this case, as shown in FIG. 3A, the connecting portion 21 is a connecting portion whose outer edge is contoured by the shape of the two notches 23 on the tip 23e side in a plan view. As shown in FIG. 3A, the outer edge of the connecting portion 21 is contoured by two curves (lines drawing the shape of the tip 23e side of the notch 23) approaching each other in a plan view. Therefore, as shown in FIG. 3A, the connecting portion 21 has a three-dimensional shape such that the width of the connecting portion 21 becomes evenly narrower from both sides toward the upper part of the arch shape in a plan view. ..

Further, in the balance weight 20 according to the present embodiment, the two notches 23 are arranged at the center position of the balance weight 20 in the direction of the contour line L4 of the segment 11. However, the two notches 23 can be arranged at arbitrary positions of the balance weight 10 in the direction of the contour line L4 of the segment 11. Further, the tips 23e of the two notches 23 can be arranged at arbitrary positions with the contour line L4 of the segment 11 as a base point. The length L of the notch 23 (the length between the tip 23e of the notch 23 and the contour line L4 of the segment 11) L can also be adjusted as appropriate. Further, in the balance weight 20 according to the present actual embodiment, the length L of the notch 23 is set so that the length L of the two notches 23 becomes equal. However, the width d, the length L, and the position of the notch 23 in the entire balance weight 20 can be appropriately selected. The two notches 23 extend in the direction along the contour line L3. However, the notch 23 may be oblique to the contour lines L3 and L4 in a plan view.

By the way, in the balance weight 20 according to the present actual embodiment, the contour shape of the tip 23e side of the notch 23 is a semicircular shape in a plan view as shown in FIG. 3A. As shown in FIG. 3A, the notch 23 has a notch main body portion 23a extending with the same width d and a notch tip portion 23b connected to the notch main body portion 23a. The contour shape of the notch 23 on the tip 23e side is formed by the contour shape of the notch tip 23b. In the present embodiment, the contour shape of the notch tip portion 23b is a semicircular shape having a radius r = d / 2.

Even in the balance weight 20 according to the present embodiment, the overhanging portion B is two overhanging portions 14. In the present embodiment, the overhanging portion 14 is formed by projecting a part of the contour line L3 of each segment 11 in a plan view. Also in this embodiment, the welding width (welding length) of the balance weight 20 is the width W14 of the overhanging portion 14 in the contour line L3 direction of the segment 11. The width W14 of the overhanging portion 14 is limited to be shorter than the overall width W20 in the contour line L3 direction of the balance weight 20. That is, in a plan view, the welding width is limited to be short by projecting a part of the contour line L3 of the segment 11 to form the welded portion 70. In this way, if the welding width of the balance weight 20 is limited to be short, in the state where the balance weight 20 is welded to the rotary shaft 110, the force from the rotary shaft 110 is applied to the welded portions 70 of each of the two segments 11. When relatively applied, specifically, when a twisting force or the like is applied between the welded portions 70, the binding force of the rotating shaft 110 with respect to the balance weight 20 weakens. Therefore, the balance weight 20 according to the present embodiment can also relieve the stress concentrated on the welded portion 70.

Further, the balance weight 20 according to the present embodiment has a connecting portion 21 for connecting the two segments 11, and has a relief structure C for releasing the force transmitted to the main body portion A. As shown in FIG. 3A, the connecting portion 21 partitions the gap G together with the two segments 11 in a plan view, and the gap G is a notch 23. In this case, even when the force from the rotating shaft 110 is relatively applied to the welded portion 70 of each of the two segments 11, the connecting portion 21 can be easily moved with one connecting portion 21 as the main range of motion. Therefore, the stress concentrated on the welded portion 70 can be further relaxed.

In particular, in the balance weight 20 according to the present embodiment, as described above, the connecting portion 21 is a connecting portion that protrudes outward from the mating surface 13a of each segment 11 in an arch shape. According to the balance weight 20 according to the present embodiment, even when the force from the rotating shaft 110 is relatively applied to the welded portion 70 of each of the two segments 11, the connecting portion 21 is arched as shown in FIG. 3B. Since the region of the connecting portion 21 becomes wide and a large range of motion due to the protruding shape, the stress concentrated on the welded portion 70 can be further relaxed.

Further, in the balance weight 20 according to the present embodiment, the segment 11 has a protruding portion 11b that protrudes together with the connecting portion 21 so as to form a part of the arch shape. In this case, by increasing the range of motion, the stress concentrated on the welded portion 70 with the rotating shaft 110 can be further relaxed.

In addition, in the balance weight 20 according to the present embodiment, the notches 23 are arranged at two positions sandwiching the connecting portion 21. In this case, with one connecting portion 21 as the main range of motion, the stress concentrated on the plurality of welded portions 70 can be dispersed in a well-balanced manner with respect to each of the welded portions 70, and the concentration of the stress can be relaxed. ..

Further, in the balance weight 20 according to the present embodiment, the contour shape of the notch 23 on the tip 23e side is a semicircular shape in a plan view as shown in FIG. 3A. In this case, the stress concentration between the connecting portion 21 and the notch 23 can be relaxed.

Next, in FIGS. 4A and 4B, reference numeral 300 is a rotary shaft with a balance weight according to the third embodiment of the present invention. As shown in FIG. 4B, the rotary shaft 300 with a balance weight is obtained by welding the balance weight 30 to the outer surface F of the rotary shaft 110 of FIG. The balance weight 30 is a balance weight according to the third embodiment of the present invention. The balance weight 30 is a modification of the balance weight 20 according to the second embodiment of the present invention. Hereinafter, the parts substantially the same as those in FIGS. 1, 2A and B, and FIGS. 3A and B have the same reference numerals, and the description thereof will be omitted.

In the balance weight 30 according to the present embodiment, the main body portion A has at least one connecting portion 31 that connects the two segments 11. In the present embodiment, the main body A is composed of two segments 11 and one connecting portion 31. Further, in the present embodiment, the connecting portion 31 is provided as the relief structure C. Similar to the connecting portion 21 according to the first embodiment, the connecting portion 31 is a connecting portion that projects in an arch shape outward from the mating surface 13a of each segment 11, as shown in FIG. 4B.

Similar to the balance weight 20, the balance weight 30 according to the present embodiment also has a connecting portion 31 projecting in an arch shape from between the two segments 11 to form a space S between the balance weight 30 and the rotating shaft 110. Specifically, as shown in FIG. 4B, for example, the inner surface 32 of the connecting portion 31 is placed between the inner surface 32 of the rotating shaft 110 and the outer surface F of the rotating shaft 110 in a state where the balance weight 30 is welded to the rotating shaft 110 in the axial direction. , Forming a space S.

Further, also in the balance weight 30 according to the present embodiment, as shown in FIGS. 4A and 4B, the connecting portion 31 partitions the gap G together with the two segments 11, and the gap G is the notch 23. That is, also in this embodiment, the relief structure C is composed of a connecting portion 31 formed by at least one notch 23.

Similar to the balance weight 20, the balance weight 30 according to the present embodiment also has two notches 23 arranged at two positions sandwiching the connecting portion 31 as shown in FIG. 4A. That is, also in this embodiment, the connecting portion 31 is a connecting portion having a width narrower than the overall width W30 in the contour line L3 direction of the balance weight 30. Also in this case, as shown in FIG. 4A, the connecting portion 31 is a connecting portion whose outer edge is contoured by the shape of the two notches 23 on the tip 23e side in a plan view. As shown in FIG. 4A, the outer edge of the connecting portion 31 is contoured by two curves (lines drawing the shape of the tip 23e side of the notch 23) approaching each other in a plan view. Therefore, as shown in FIG. 4A, the connecting portion 31 has a three-dimensional shape such that the width of the connecting portion 31 becomes evenly narrower from both sides toward the upper part of the arch shape in a plan view. .. However, in this embodiment, the following points are different from the balance weight 20.

In the balance weight 30 according to the actual embodiment, the contour shape of the notch 23 on the tip 23e side is a circular shape in a plan view as shown in FIG. 4A. As shown in FIG. 4A, the notch 23 has a notch main body portion 23a extending with the same width d and a notch tip portion 23c connected to the notch main body portion 23a in a plan view. The contour shape of the notch 23 on the tip 23e side is formed by the notch tip 23c. The contour shape of the notch tip portion 23c is a circular shape having a radius R larger than d / 2, except for a part on the notch main body portion 23a side.

The balance weight 30 according to the present embodiment also has a connecting portion 31 that connects the two segments 11, and has a relief structure C that releases the force transmitted to the balance weight 30. Also in this embodiment, as shown in FIG. 4A, the connecting portion 31 partitions the gap G together with the two segments 11 in a plan view, and the gap G is the notch 23. In this case, when a force from the rotating shaft 110 is relatively applied to the welded portions 70 of each of the two segments 11, specifically, when a torsional force or the like is applied between the welded portions 70. With one connecting portion 31 as the main range of motion, the connecting portion 31 can be easily moved, so that the stress concentrated on the welded portion 70 can be further relaxed.

In particular, in the balance weight 30 according to the present embodiment, the connecting portion 31 is also a connecting portion that protrudes outward from the mating surface 13a of each segment 11 in an arch shape. According to the balance weight 30 according to the present embodiment, when a force from the rotary shaft 110 is applied relatively to the welded portions 70 of each of the two segments 11, specifically, between the welded portions 70. As shown in FIG. 4B, even when a twisting force or the like is applied, the region of the connecting portion 31 is wide and a large range of motion is obtained because the connecting portion 31 protrudes in an arch shape. As a result, the stress concentrated on the welded portion 70 can be relaxed.

Further, in the balance weight 30 according to the present embodiment, the contour shape of the notch 23 on the tip 23e side is a circular shape in a plan view as shown in FIG. 4A. In this case, the stress concentration between the connecting portion 31 and the notch 23 can be relaxed.

Next, in FIGS. 5A and 5B, reference numeral 400 is a rotary shaft with a balance weight according to the fourth embodiment of the present invention. As shown in FIG. 5B, the rotary shaft 400 with a balance weight is obtained by welding the balance weight 40 to the outer surface F of the rotary shaft 110 of FIG. The balance weight 40 is a balance weight according to the fourth embodiment of the present invention. The balance weight 40 is another modification of the balance weight 20. Hereinafter, the parts substantially the same as those in FIGS. 1, 2A and B, 3A and B, and 4A and B will have the same reference numerals, and the description thereof will be omitted.

According to the present invention, the number of connecting portions may be at least one. In the balance weight 40 according to the present embodiment, the main body portion A has at least one connecting portion 41 that connects the two segments 11. In the present embodiment, the main body A is composed of two segments 11 and two connecting portions 41. Further, in the present embodiment, the connecting portion 41 is provided as the relief structure C. Similar to the connecting portions 21 and 31 according to the other embodiments, the connecting portion 41 is a connecting portion that projects in an arch shape outward from the mating surface 13a of each segment 11, as shown in FIG. 5B.

As shown in FIG. 5B, the balance weight 40 according to the present embodiment also has a connecting portion 41 projecting in an arch shape from between the two segments 11 to form a space S with the rotating shaft 110. Specifically, as shown in FIG. 5B, for example, the inner surface 42 of the connecting portion 41 is placed between the inner surface 42 of the rotating shaft 110 and the outer surface F of the rotating shaft 110 in a state where the balance weight 40 is welded to the rotating shaft 110 in the axial direction. , Forming a space S.

Further, in the balance weight 40 according to the present embodiment, as shown in FIGS. 5A and 5B, the two connecting portions 41 partition the gap G together with the two segments 11 in a plan view as shown in FIG. 5A. The gap G is a hole 43. That is, in the present embodiment, the relief structure C is composed of a plurality of connecting portions 41 formed by at least one hole 43. In this way, the plurality of connecting portions 41 can be formed by at least one hole 43. The hole 43 extends from the outer surface 12 to the inner surface 13 of each of the two segments 11. In other words, the hole 43 penetrates the balance weight 40.

In the balance weight 40 according to the present embodiment, as shown in FIG. 5A, the hole 43 is arranged between the two segments 11 in a plan view. In this embodiment, it is arranged at the center of the balance weight 40. Further, also in the present embodiment, the connecting portion 41 is located between the contour line L4 of the segment 11 and the hole 43, and is a connecting portion narrower than the overall width W40 in the contour line L3 direction of the segment 11. In this case, the connecting portion 41 is a connecting portion whose outer edge is contoured by the contour line L4 of the segment 11 and the shape of the hole 43 on the tip 43e side. As shown in FIG. 5A, the connecting portion 41 is a curved line (in the present embodiment, a line drawing the shape of the tip 43e side of the hole 43) and a straight line (in the present embodiment) in which one approaches the other in a plan view. The outer edge of the segment 11 is contoured by the contour line L4). Therefore, as shown in FIG. 5A, the connecting portion 41 has a three-dimensional shape such that the width of the connecting portion 41 is biased and narrowed to one side toward the upper part of the arch shape in a plan view. ..

Further, in the balance weight 40 according to the present embodiment, the hole 43 is arranged at the center position of the contour line L4 in the direction of the contour line L4 of the segment 11. However, the hole 43 can be arranged at an arbitrary position in the direction of the contour line L4 of the segment 11. Further, each tip 43e of the hole 43 can be arranged at an arbitrary position toward the contour line L4 of the segment 11. The length L of the hole 43 (the length between the two tips 43e) L can also be adjusted as appropriate. Further, in the balance weight 40 according to the present actual embodiment, the hole 43 passes through the center of the contour line L3 of the segment 11 and is line-symmetrical with respect to the line extending along the contour line L4 of the segment 11. In other words, the holes 43 are arranged so that the widths of the two connecting portions 41 are equal. The width d, the length L, and the position of the hole 43 in the entire balance weight 40 can be appropriately selected. The two holes 43 extend in the direction along the contour line L3. However, the hole 43 may be oblique to the contour lines L3 and L4 of the segment 11 in a plan view.

In particular, in the present embodiment, the hole 43 is a long hole in a plan view as shown in FIG. 5A. More specifically, as shown in FIG. 5A, the hole 43 has a hole body portion 43a extending with the same width d and a hole tip portion 43b connected to the hole body portion 43a. The contour shape of both tips 43e of the hole 43 is formed by the contour shape of the hole tip 43b. In the present embodiment, the contour shape of the hole tip portion 43b is a semicircular shape having a radius r = d / 2.

The balance weight 40 according to the present embodiment has a connecting portion 41 that connects two segments 11 and has a relief structure C that releases a force transmitted to the balance weight 40. The two connecting portions 41 are formed by holes 43. The two connecting portions 41 partition the gap G together with the two segments 11, and the gap G is a hole 43. Also in this case, when a force from the rotary shaft 110 is relatively applied to the welded portions 70 of each of the two segments 11, specifically, when a torsional force or the like is applied between the welded portions 70. Further, it is possible to relax the stress concentrated on the welded portion 70 with the rotating shaft 110 while sufficiently ensuring the rigidity of the balance weight 40.

In particular, in the balance weight 40 according to the present embodiment, the connecting portion 41 is also a connecting portion that protrudes outward from the mating surface 13a of each segment 11 in an arch shape. According to the balance weight 40 according to the present embodiment, when a force from the rotary shaft 110 is applied relatively to the welded portions 70 of each of the two segments 11, specifically, between the welded portions 70. Even when a twisting force or the like is applied, as shown in FIG. 5B, the region of the connecting portion 41 is wide and a large range of motion is obtained because the connecting portion 41 protrudes in an arch shape. As a result, the stress concentrated on the welded portion 70 can be relaxed.

Further, in the balance weight 40 according to the present embodiment, the hole 43 is a long hole. In this case, the stress concentration between the connecting portion 41 and the hole 43 can be relaxed.

According to the present invention, the shape of the hole 43 is not particularly limited. For example, it may be an elliptical hole, a polygonal elongated hole such as a rectangular hole, or the like. Further, the hole 43 may be a regular polygonal hole such as a circular hole or a square hole instead of a long hole.

Further, in FIGS. 6A and 6B, reference numeral 500 is a rotary shaft with a balance weight according to the fifth embodiment of the present invention. As shown in FIG. 6B, the rotary shaft 500 with a balance weight is obtained by welding the balance weight 50 to the outer surface F of the rotary shaft 110 of FIG. The balance weight 50 is a balance weight according to the fifth embodiment of the present invention. The balance weight 50 is a modification of the balance weight 10 according to the first embodiment. Hereinafter, the parts substantially the same as those of FIGS. 1, 2A and B, 3A and B, 4A and B, and 5A and B are designated by the same reference numerals, and the description thereof will be omitted.

In the balance weight 50 according to the present embodiment, the main body A is composed of one segment 11. As shown in FIG. 6A, the segment 11 is formed in a rectangular shape divided by the contour lines L3 and L4 of the segment 11 in a plan view. Further, in the present embodiment, at least one overhanging portion B is one overhanging portion 15. In the present embodiment, one overhanging portion 15 is formed by projecting a part of one of the two contour lines L3 in the plan view of the segment 11. As shown in FIG. 6A, the overhanging portion 15 can be configured in the same manner as the above-mentioned overhanging portion 14 in a plan view.

In the rotary shaft 500 with a balance weight according to the present embodiment, two balance weights 50 are welded around the axis O at intervals. Specifically, as shown in FIG. 6A and the like, the two balance weights 50 are arranged on the rotating shaft 110 so that the overhanging portions 15 extend in opposite directions around the axis O (circumferential direction). Welded against. Therefore, in the two balance weights 50, one contour line L3 side is welded to the rotating shaft 110 by the overhanging portion 15, while the other contour line L3 side facing each other is open to the rotating shaft 110. It is configured in.

Also in this embodiment, the welding width of the balance weight 50 is the width W15 in the contour line L3 direction of the overhanging portion 15. The width W15 of the overhanging portion 15 is limited to be shorter than the overall width W50 of the balance weight 10 in the contour line L3 direction. That is, the weld width is limited to be short by projecting a part of the contour line L3 in the plan view of the segment 11 to form the welded portion 70. In this way, if the welding width of the balance weight 50 is limited to be short, in the state where the balance weight 50 is welded to the rotary shaft 110, the force from the rotary shaft 110 is applied to the welded portions 70 of each of the two segments 11. When relatively applied, specifically, when a torsional force or the like is applied between the welded portions 70, the binding force of the rotating shaft 110 with respect to the balance weight 50 weakens. Therefore, the balance weight 50 according to the present embodiment can also relieve the stress concentrated on the welded portion 70.

In this embodiment, two balance weights 50 are welded in parallel around the axis O, but the balance weights 50 can be used with one balance weight 50 without combining two or more. be.

In each of the balance weights 10 to 50 according to the above-described embodiments, the main body A is composed of plate-shaped segments 11. In this case, the balance weights 10 to 50 can be easily manufactured as an integral body by, for example, press working using one plate-shaped member.

Further, in each of the above-described embodiments, the basic shape of the main body A is a rectangular shape in a plan view, but various shapes such as a polygonal shape, a circular shape, and an elliptical shape other than the rectangular shape can be used. can. That is, the contour shape of the entire balance weights 10 to 50 is basically a rectangular shape in a plan view, but the basic contour shape of the balance weight according to the present invention is not limited to the rectangular shape. .. The basic contour shape of the balance weight according to the present invention can also be various shapes such as a polygonal shape, a circular shape, and an elliptical shape other than the rectangular shape.

Further, the rotary shafts 100 to 500 with a balance weight according to each of the above-described embodiments have a rotary shaft 110 and one of the balance weights 10 to 50 fixed to the outer surface F of the rotary shaft 110. According to the rotary shafts 100 to 500 with a balance weight according to each of the above-described embodiments, the product life can be improved by relaxing the stress concentrated on the welded portion 70.

Further, the rotary shafts 100 to 500 with balance weights according to each of the above-described embodiments can be manufactured by welding any of the above-mentioned balance weights 10 to 50 to the outer surface F of the rotary shaft 110.

In the method for manufacturing a rotary shaft with a balance weight according to an embodiment of the present invention, any one of the above balance weights 10 to 50 is used as the balance weight, and the overhanging portions 14 and 15 of the balance weights 10 to 50 are used. Is welded to the outer surface F of the rotary shaft 110. According to the method for manufacturing a rotary shaft with a balance weight according to the present embodiment, it is possible to obtain a rotary shaft with a balance weight of 100 to 500 having an improved product life.

7A and 7B are rotary shafts 600 with balance weights according to the reference example, in which the balance weight 60 according to the reference example is applied to the rotary shaft 110 of FIG. As shown in FIG. 7B, the rotary shaft 600 with a balance weight is obtained by welding the balance weight 60 to the outer surface F of the rotary shaft 110 of FIG. Hereinafter, the parts substantially the same as those of FIGS. 1, 2A and B, 3A and B, 4A and B, 5A and B, and 6A and B are designated by the same reference numerals, and the description thereof will be omitted.

The rotary shaft 600 with a balance weight is a central portion of the balance weight 60, and the balance weight 60 is spot welded to the rotary shaft 110. In this example, reference numeral 61 is a spot welded portion. Further, reference numeral 70 is a welded portion after spot welding. In this way, if the balance weight 60 is welded at only one place, the stress concentrated on the welded portion 70 can be relaxed.

The above is an example of various embodiments of the present invention, and various modifications can be made according to the description of the scope of claims. For example, as in the above embodiment, it is preferable that the connecting portions 21, 31 and 41 are arched outward from the mating surface 13a of each segment 11. However, the connecting portions 21, 31 and 41 do not have to protrude outward from the mating surface 13a of each segment 11 in an arch shape. That is, the inner surface 22 of the connecting portion 21, the inner surface 32 of the connecting portion 31, and the inner surface 42 of the connecting portion 41 rotate in a state where the balance weights 20, 30 and 40 are welded to the rotating shaft 110 in the axial direction, respectively. It can be matched with the outer surface F of the shaft 110.

Further, in the balance weights 20 to 40 according to the above-described embodiment, the connecting portions 21, 31 and 41 are connected to the protruding portions 11b of the segment 11, respectively, but can be directly connected to the mating portion 11a of the segment 11. .. That is, according to the present invention, the protruding portion 11b (rising surface 13b) of the segment 11 can be omitted.

Further, the balance weights 10 to 50 according to each of the above-described embodiments are arranged with respect to the outer surface F of the rotating shaft 110 so that the contour line L1 (contour line L3) of the segment 11 is arranged parallel to the axis line O. It is welded. However, the balance weight according to the present invention may be welded to the outer surface F of the rotating shaft 110 so that the contour line L2 (contour line L4) of the segment 11 is arranged parallel to the axis line O, for example. can.

Further, in the balance weights 20 to 40 according to the above-described embodiment, the gap G extends along the contour line L1 (contour line L3) of the segment 11 in each plan view. However, the extending direction of the gap G can be appropriately changed according to the orientation of the balance weights 20 to 40 fixed to the rotating shaft 110. Further, the shape, number and arrangement of the gaps G can also be appropriately changed according to the shape, number and arrangement of the connecting portions 21, 31.41.

Further, each configuration of the balance weight and the rotary shaft with the balance weight according to each of the above-described embodiments can be appropriately replaced with each other or used in combination.

10: Balance weight (first embodiment), 11: Segment, 11a: Alignment part, 11b: Projection part, 12: Outer surface of segment, 13: Inner surface of segment, 13a: Alignment surface, 13b: Rising surface, 14: Overhanging part, 15: Overhanging part, 20: Balance weight (second embodiment), 21: Connecting part, 22: Inner surface of connecting part, 23: Notch, 23a: Notch main body part, 23b: Notch tip part ( The tip of the notch), 23c: the tip of the notch (the tip of the notch), 23e: the tip of the notch, 30: the balance weight (third embodiment), 31: the connecting part, 32: the inner surface of the connecting part, 40: Balance weight (fourth embodiment), 41: connecting part, 42: inner surface of connecting part, 43: hole, 43a: hole body part, 43b: hole tip part (one side end side of hole), 43e: hole tip , 50: Balance weight (fifth embodiment), 60: Balance weight, 61: Welded portion, 100: Rotating shaft with balance weight (first embodiment), 110: Rotating shaft, 200: Rotating shaft with balance weight (Second embodiment), 300: Rotating shaft with balance weight (third embodiment), 400: Rotating shaft with balance weight (fourth embodiment), 500: Rotating shaft with balance weight (fifth embodiment). Form), 600: Rotary shaft with balance weight, A: Main body, B: Overhang, C: Relief structure, d: Cut (hole) width, F: Outer surface of rotary shaft, G: Gap, L: Cut Length of (hole), L1: Contour line (short side) of segment, L2: Contour line (long side) of segment, L3: Contour line (long side) of segment, L4: Contour line of segment Contour line (on the short side), O: Axis line, R: Radius of the notch tip, r: Radius of the notch tip (hole tip), S: Space, 70: Welded part

Claims (7)

A balance weight that is welded to the outer surface of the rotating shaft.
It has a main body portion and at least one overhanging portion formed by projecting a part of the contour line of the main body portion in a plan view.
The overhanging portion is a welded portion.
The main body is formed in a rectangular shape divided by two types of contour lines extending in directions orthogonal to each other.
The overhanging portion protrudes from one of the two types of contour lines in a plan view along the direction in which the other of the two types of contour lines extends.
Further, the inner surface of the main body portion is composed of a mating surface that matches the outer surface of the rotating shaft together with the inner surface of the overhanging portion in a state where the overhanging portion is welded to the rotating shaft. In claim 1, the at least one overhang is a balance weight, which is two overhangs. The balance weight according to claim 2, wherein the main body portion has a connecting portion connecting two segments and has an escape structure for releasing a force transmitted to the main body portion. In claim 1, the at least one overhanging portion is a balance weight. In any one of claims 1 to 4, the main body portion is a balance weight which is a plate-shaped segment. A rotary shaft with a balance weight, comprising the rotary shaft and the balance weight according to any one of claims 1 to 5, which is welded to the outer surface of the rotary shaft. It is a method of manufacturing a rotary shaft with a balance weight by welding a balance weight to the outer surface of the rotary shaft.
As the balance weight, the balance weight according to any one of claims 1 to 5 is used.
A method for manufacturing a rotary shaft with a balance weight, in which the overhanging portion of the balance weight is welded to the outer surface of the rotary shaft.

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