JP3479098B2 - Torque converter balancing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque converter, and more particularly to a balancing device for balancing the rotation of a turbine runner. [0002] In a torque converter, a pump impeller rotated by a power source collides an internal working fluid with a turbine runner to drive the turbine runner, and returns the working fluid to the pump impeller under the guidance of a stator. Thus, power transmission is performed with an increase in torque. In order to balance the rotation of a turbine runner which is an output element of a torque converter, for example, the following methods have been conventionally considered. This method is as shown in FIG. That is, the blades 3 are interposed between the annular opposing surfaces of the outer shell 1 and the inner core 2, and the claws 3 a
Is inserted into a hole 2a formed in the inner core 2 and bent along the inner surface 2b of the inner core 2 far from the outer shell 1, so that a flat straight rod-shaped balance is obtained in the turbine runner in which each blade 3 is mounted on the inner core 2. The piece 4 is arranged along the inner surface 2 b of the inner core 2, and is fixed to the inner core 2 by one spot welding 5. [0005] However, conventionally, since the balance piece 4 has a straight rod shape, the following problems have occurred. That is, if the rotational unbalance amount of the turbine runner is large, naturally, as described in the above document,
This is dealt with by increasing the length of the balance piece 4. However, in the conventional configuration in which the balance piece 4 has a straight rod shape, since the inner core inner surface 2b of the counterpart to which the balance piece 4 is attached is annular, the balance piece 4 is removed. There are restrictions on how long it can be. Therefore, when the rotational unbalance amount of the turbine runner is large, as shown in FIG. 5, there has been no other choice but to provide a plurality of balance pieces 4 in a set so as to sequentially follow the annular shape of the inner core inner surface 2b. For this reason, in the conventional configuration, the number of times of welding is increased by the number of balance pieces, which is disadvantageous in cost, and it is difficult to obtain the welding position accuracy of each balance piece, so that the number of times of welding is further increased to correct the balancing. The work was very difficult. An object of the present invention is to provide a torque converter balancing apparatus which does not cause these problems. [0008] To this end, a balancing device for a torque converter according to the present invention has a blade interposed between an annular concave surface of an outer shell and an annular convex surface of an inner core facing each other. For the inner core, a turbine runner attached by inserting a claw of each blade into a hole formed in the inner core, and bending the claw along an inner annular concave surface of the inner core far from the outer shell; A flat balance piece arranged in a plane perpendicular to the axis of the inner core is extended and welded to the inner annular concave surface of the inner core in the annular direction to weld the turbine runner so as to balance the rotation of the turbine runner. An arc so that the balance piece follows the annular shape of the inner annular concave surface of the inner core And the arc length of the flat balance piece is set to a length corresponding to the rotational imbalance of the turbine runner, so that the flat balance piece is in close contact with the inner annular concave surface of the inner core in a state where the flat balance piece is provided. One protruding projection is formed, and a flat balance piece is welded to the inner core at the projection. The turbine runner transmits a predetermined power as an output element of the torque converter. Here, the rotational balance of the turbine runner is obtained by extending and welding a flat balance piece disposed in a plane perpendicular to the axis of the turbine runner to the inner annular concave surface of the inner core in the annular direction. [0010] Incidentally, since the flat balance piece has an arc shape along the annular shape of the inner annular concave surface of the inner core, the flat balance piece is lengthened to cope with a large amount of rotational unbalance of the turbine runner. In this case, there is no restriction, and the arc length of the flat balance piece can be freely increased in accordance with the rotational imbalance of the turbine runner. Accordingly, even when the rotational unbalance amount of the turbine runner is large, the rotational balance of the turbine runner can be balanced only by one flat balance piece having a length corresponding to the amount. [0011] In attaching the one flat balance piece to the inner annular concave surface of the inner core,
One projection is formed on the arc-shaped flat balance piece along the annular shape of the inner annular concave surface of the inner core so as to protrude in close contact with the inner annular concave surface of the inner core, and the flat balance piece is welded to the inner core at the projection. Therefore, even if the inner surface of the inner core is curved in an annular groove shape, the arc-shaped flat balance piece can be reliably fixed to the inner annular concave surface of the inner core only by the one-point welding. As is apparent from the above, even when the rotational unbalance amount of the turbine runner is large, the number of times of welding of the balance piece does not increase as in the above-described conventional configuration, which is advantageous in terms of cost, and the balancing operation can be performed. Extremely easy. Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 4 show a balancing device according to an embodiment of the present invention, and FIGS. 1 and 2 show a turbine runner of a torque converter to which the device is applied. This turbine runner is constructed by interposing a blade 3 between an annular concave surface of an outer shell 1 and an annular convex surface of an inner core 2 facing each other. Each blade 3 inserts its claw 3a into a hole 2a formed in the inner core 2,
The tip of the claw 3a protruding from the hole 2a is
The inner blade 2 is bent along the inner surface (inner annular concave surface) 2b of the inner core 2 farther from the inner core 2 to connect the blades 3 and the inner core 2 to each other. Also, the claws 3b of each blade 3 are connected to the outer shell 1
The blade 3 and the outer shell 1 are connected by bending the tip of a claw 3b projecting from the hole 1a along the outer surface 1b of the outer shell 1 far from the inner core 2. Thus, each blade 3 is integrated with the inner core 2 and the outer shell 1 to form a turbine runner. In order to balance the rotation of the turbine runner, in this embodiment, a flat balance piece 6 disposed in a plane perpendicular to the axis of the turbine runner is disposed along the inner surface (inner annular concave surface) 2b of the inner core 2. And
As shown in FIG. 1, the flat balance piece 6 is formed in an arc shape along the annular shape of the inner annular concave surface 2b of the inner core 2, and the length of the arc corresponds to the rotational imbalance of the turbine runner. The length should be such that it can be balanced. At the center of the balance piece 6, there is formed one projection 6a projecting toward the inner core annular inner surface 2b as clearly shown in FIGS. 3 and 4, and the amount of projection of the projection 6a depends on the inner core annular inner surface 2b. Even if it is curved as shown in FIG. Then, the balance piece 6 is welded to the annular inner surface 2b of the inner core 2 at the projection 6a. In the structure of this embodiment, the turbine runner performs a predetermined power transmitting action as an output element of the torque converter, and the rotational balance of the turbine runner is determined by connecting a flat balance piece 6 disposed in a plane perpendicular to the axis of the turbine runner to the inner core 2. Of the inner annular concave surface 2b is extended in the annular direction and welded as described above. Incidentally, since the flat balance piece 6 has an arc shape along the annular shape of the inner annular concave surface 2b of the inner core 2, the flat balance piece 6 is adapted to cope with a case where the rotational unbalance of the turbine runner is large. Is not subject to any restrictions when lengthening
As described above, the arc length of the flat balance piece 6 can be freely increased in accordance with the rotational imbalance of the turbine runner. Therefore, even when the rotational unbalance amount of the turbine runner is large, the rotational balance of the turbine runner can be balanced by only one flat balance piece 6 having a length corresponding to this. When the one balance piece 6 is attached to the inner core inner surface 2b, an arc-shaped balance piece 6 arranged along the annular shape of the inner core inner surface 2b is provided so as to protrude so as to be in close contact with the inner core inner surface 2b. Since the protrusion 6a is formed and the balance piece 6 is welded (7) to the inner core inner surface 2b at the one protrusion 6a, even if the inner core inner surface 2b is curved as shown in FIG. Welding can be performed, and the arc-shaped balance piece 6 can be fixed to the curved inner core inner surface 2b only by the one-point welding 7. Therefore, even when the amount of unbalance of the turbine runner is large, the number of times of welding the balance piece 6 does not increase as in the conventional apparatus, which is advantageous in terms of cost and makes the balancing operation extremely easy. Become. As described above, according to the first aspect of the present invention, there is provided a balancing device for a torque converter, comprising: a flat flat balance piece disposed in a plane perpendicular to the axis of a turbine runner; Are arranged in an arc shape along the annular shape of the inner annular concave surface, the arc length of the flat balance piece is set to a length corresponding to the rotational imbalance of the turbine runner, and the inner core is provided with the flat balance piece arranged. One projection is formed by protruding so as to be in close contact with the inner annular concave surface, and the flat balance piece is welded to the inner core at the one projection. Therefore, even when the rotational unbalance amount of the turbine runner is large, the flat balance Because of the arc shape, the pieces can be freely lengthened to accommodate the rotational imbalance. In this case, also in this case, the rotational balance of the turbine runner can be balanced only by one flat balance piece having a length corresponding to this, and the one flat balance piece is provided on the inner annular concave surface of the inner core. In welding, the balance piece is welded to the inner annular concave surface of the inner core at one projection provided on the balance piece so as to be in close contact with the inner annular concave surface of the inner core. Therefore, even if the inner annular concave surface of the inner core is curved, the arc shape is obtained. Can be securely fixed to the inner annular concave surface of the inner core only by the one-point welding. As is apparent from the above, even when the rotational unbalance amount of the turbine runner is large, the number of times of welding the balance pieces does not increase as in the conventional apparatus, which is advantageous in terms of cost and extremely easy in balancing work. become.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a turbine runner provided with a torque converter balancing device according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the turbine runner. FIG. 3 is a cross-sectional view of the balance piece shown as a cross section on the line AA in FIG. 1; FIG. 4 is a cross-sectional view showing a close relationship between a projection of the balance piece and an inner core inner surface shown as a cross section on the line BB in FIG. 1; FIG. 5 is a front view of a turbine runner showing a conventional torque converter balancing device. [Description of Signs] 1 Outer shell 1a Hole 1b Outer shell outer surface 2 Inner core 2a Hole 2b Inner core inner surface 3 Blade 3a Claw 3b Claw 6 Balance piece 6a Projection 7 Welding

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-191551 (JP, A) JP-A-57-23834 (JP, A) JP-A-4-185936 (JP, A) (58) Investigation Field (Int.Cl. ⁷ , DB name) F16H 39/00-47/12 F16F 15/00-15/36

Claims (1)

(57) [Claims 1] A blade is interposed between the annular concave surface of the outer shell and the annular convex surface of the inner core which face each other,
For each of the inner cores, a turbine runner is provided by inserting a claw of each blade into a hole formed in the inner core and bending the claw along the inner annular concave surface of the inner core far from the outer shell. ,
In the torque converter to take the rotational balance of the turbine runner by welding by extending into the annular direction flat balance piece disposed perpendicular to the axis plane of the turbine runner to the inside annular concave surface of said inner core, the plate Jo of flat balance piece while disposed in an arc-like shape along the inner annular concave annular the inner core,
The arc length of the flat balance piece is set to a length corresponding to the rotational imbalance of the turbine runner, and one projection is formed to protrude in close contact with the inner annular concave surface of the inner core in a state where the flat balance piece is disposed. And a flat balance piece welded to the inner core at the projection.