JP3625161B2 - Balance piece for fluid transmission - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a balance piece for a fluid transmission device that is mounted on a balancer welding machine that balances a rotating body.
[0002]
[Prior art]
Conventionally, as a balance piece for this type of fluid transmission device, for example, there is one as shown in FIG. Further, as a conventional technique using this balance piece 200, there is one described in Japanese Utility Model Laid-Open No. 7-21271. According to this publication, a welding gun is provided at the tip of a welding head 6 supported on a rotating body held on a balancer so as to be movable up and down, and has an opening at the lower end, and a negative pressure is supplied to the opening. Auxiliary equipment. And the electrode part of the welding gun is made into the same shape as the planar shape of the balance piece 200. As a result, the balance piece 200 is transported and welded to an accurate position on the rotating body, so that the reliability is high and the workability is improved because the positioning of the balance piece 200 may be attracted to the opening. It is.
[0003]
[Problems to be solved by the invention]
However, in the conventional balance piece 200, since the distance between the tip of the projection 200a and the end 200b of the balance piece is long, the projection is caused by slight inclination or deflection due to the pressure during welding when welding to the turbine core. Both 200a and end 200b come into contact with the turbine core. At this time, in the case of welding by blowing sparks in a concentrated manner, such as projection welding, a spark is produced only when only the projection 200a comes into contact, but when both the projection 200a and the end 200b are in contact, the projection There was a problem in that the welding strength was reduced because no sparks were produced from the portion 200a.
[0004]
FIG. 6 shows a case where a turbine is balanced using a conventional balance piece. As shown, turbine blade claws are implanted in the turbine core and brazed. Therefore, when a certain amount of weight is required for balancing, a plurality of balance pieces with the size of the gap as an upper limit must be welded to the gap between the brazed claws. As a result, there is a problem in that the number of work processes is increased.
[0005]
Also, for balancing, it is desirable to place the balance piece in one point as much as possible. However, as described above, when only a small balance piece can be used, the balance piece is welded in the circumferential direction. Therefore, there is a problem that the weight cannot be concentrated on one point and balance cannot be achieved. These problems are particularly serious when the width of the turbine core is small.
[0006]
The present invention has been made to solve the above-described problems. When welding a balance piece to balance the rotating body, only the projections of the balance piece are reliably brought into contact with each other, and Even if there exists a convex part like a nail | claw part, it aims at providing the balance piece for fluid transmission devices which can concentrate on one point and balance without using several balance piece.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problem, the invention according to claim 1 is mounted on a balancer welding machine that balances a fluid transmission device including a blade between an outer shell and an inner core, so that sparks during welding are reduced. In the balance piece that has a protrusion for concentrating and that balances the weight by welding to the inner core,
The balance piece to form a convex portion protruding to the inner core side by providing a raised portion standing away from the inner core, and the fact that contains the protrusion in the protruding portion, the start-up The height of the portion is at least equal to or higher than the height of the claw portion for fixing the blade to the inner core .
[0009]
[Action and effect of the invention]
The balance piece according to claim 1 is mounted on a balancer welding machine for balancing a fluid transmission device including a blade between the outer shell and the inner core, and has a protrusion for concentrating sparks during welding. It is provided and weight balance is taken by welding to the inner core.
[0010]
At this time, by providing a rising portion in the balance piece in a direction away from the inner core, a convex portion protruding toward the inner core is formed, and the convex portion includes the protruding portion.
[0011]
Therefore, the distance from the inner core is the end of the convex portion next to the protruding portion which is a welded portion. In the prior art balance piece, the distance from the inner core is the end of the balance piece. Here, the length of the straight line connecting the projection and the end of the convex part of the balance piece of the present invention, and the length of the straight line connecting the projection of the balance piece of the prior art and the end of the balance piece In comparison, the present application has a shorter configuration. The lengths of these straight lines are proportional to the range in which the inclination is allowed, and the fact that the length of the present application is shorter indicates that the range in which the inclination is allowed is wide. Therefore, it can be reliably welded without contact other than the protrusions due to a slight inclination or the like.
[0012]
In addition , the height of the rising portion is formed to be greater than the height of the claw portion for fixing the blade to the inner core.
[0013]
Therefore, when a certain amount of weight is required for balancing, it has been necessary to avoid the claw portion in the past. Therefore, avoid the claw portion with a balance piece whose size is limited to the size of the gap between the claw portions. However, in the present application, since only the convex portion is accommodated in the gap between the claw portions, a balance piece having a necessary weight can be provided by welding at one location. Therefore, the workability can be improved.
[0014]
In addition, a plurality of balance pieces are configured separately as in the prior art, but in the present application, the weight can be concentrated in one place, so that a balance can be reliably obtained.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
[Configuration of torque converter]
FIG. 1 is an overall configuration diagram of a torque converter to which an embodiment of the present invention is applied.
[0016]
This torque converter includes an input shaft 1 for inputting rotation from an engine (not shown), a converter cover 2, an impeller assembly 3, a stator 4 having a one-way clutch 5 (hereinafter referred to as OWC), and a turbine assembly 6. It is comprised by.
[0017]
The torque converter also includes a multi-plate lockup clutch 8, and is constituted by a lockup clutch 8 connected to the converter cover 2 and a lockup damper 7 connected to the turbine assembly 6.
[0018]
A boss 21 and an impeller assembly 3 are welded to the converter cover 2. The impeller assembly 3 includes an impeller shell 31, a pump impeller 32, an impeller core 33, and a rotation support member 34.
[0019]
The stator 4 is supported by an OWC inner race 52 on a fixing member connected to a mission case (not shown) together with the OWC 5. The OWC 5 includes an OWC outer race 53, a bearing support 51, and an OWC inner race 52, and allows only one-way rotation. A thrust bearing 55 is provided between the OWC 5 and the impeller assembly 3 and the turbine assembly 6 so as not to prevent relative rotation.
[0020]
The turbine assembly 6 includes a turbine shell 61, a turbine runner 62, a turbine core 63, and a turbine hub 63. A lockup damper 7 is connected to the turbine hub 65 by a turbine rivet 66.
[0021]
The lockup damper 7 includes a drive plate 71, a side plate 72, a torsion spring 73 and a hub plate 74, and the drive plate 71, the side plate 72 and the hub plate 74 are connected via a torsion spring 73. A hub 75 is provided on the hub plate 74, and a clutch plate 83 is spline fitted to the hub 75.
[0022]
The lockup clutch 8 includes a drum 81 connected to the converter cover 2, a retaining plate 82, a clutch plate 83, a piston 84, and a hub lockup 85, and a washer support is provided by a projection 85a of the hublock up 85 during assembly. A thrust washer 23 is centered through 22 and welded to the converter cover 2.
[0023]
[Configuration of balance piece welding equipment]
FIG. 4 shows an overall configuration diagram of the welding apparatus for the balance piece of the present embodiment. The turbine assembly 6 of the torque converter is placed so that the central axis thereof coincides with the rotation axis C of the balancer. The turbine assembly 6 is provided with turbine blades 64 implanted between a turbine shell 61 and a turbine core 63.
[0024]
In order to spot weld the balance piece 100 on the turbine core 63 of the turbine assembly 6, the balancer has a set radius at which the balance piece 100 is spot welded from the rotary shaft C as shown in FIG. Above the position at the distance R, a welding head 406 is provided so as to be movable up and down.
[0025]
Further, a fluid pressure cylinder, for example, a piston rod 408 of an air cylinder 407 is provided above the welding head 406 so as to be movable up and down, and the lower end of the piston rod 408 is provided with the welding head. 406 is linked and linked.
[0026]
Incidentally, although the cross-sectional shape of the turbine core 63 is an arc as shown in FIG. 4, the overall shape forms a three-dimensional curved surface obtained by turning the cross-sectional shape around the rotation axis C. Therefore, as the balance piece 100 that can be stably welded onto the turbine core 63, as shown in FIG. 2, an arc shape having a set radius distance R from the rotation axis C as a radius is used. Yes. A protrusion 100a is formed at the center of the lower surface of the balance piece 100, and a protruding portion 100c is formed in a trapezoidal shape by a rising portion 100d. The protrusion 100a serves as a welding current concentration point during spot welding.
[0027]
On the other hand, a welding gun 409 as shown in FIG. 4 is attached to the lower end of the welding head 406 by a taper shank 410. The welding gun 409 is provided with a taper shank 410 at the upper part and an electrode part 411 at the lower part. The cross-sectional shape of the electrode portion 411 is formed in accordance with the arc shape of the balance piece 100, and the lower end tip surface is also a flat surface having the same shape. Thereby, when the balance piece 100 is adsorbed by the front end surface of the welding gun 409, positioning can be performed easily. Similarly, the welding gun 409 does not interfere with the cubic curved surface of the turbine core 63 by the electrode portion 411 having an arcuate cross section.
[0028]
In FIG. 4, in order to facilitate understanding of the welding gun 409, the welding gun 409 is shown rotated by 90 ° around the axis D of the air cylinder.
[0029]
An opening 412 for adsorption is provided on the lower surface of the electrode part 411. A vent hole 413 is provided upward from the opening part 412 and further joins a gallery 414 provided in the horizontal direction. .
[0030]
The negative pressure supply unit 415 for making the opening 412, the vent 413, and the gallery 414 negative pressure is a negative pressure in a flow path that goes straight through a filter regulator 416, an electromagnetic valve 417 connected to an air pressure source, and air. There are provided a vacuum switch 418 for turning on, a convert filter 419 for filtering the sucked air, and a silencer 420 for silencing the air flowing out from the vacuum switch 418.
[0031]
[Operation of torque converter]
Next, the operation of the torque converter with the lockup clutch will be described.
[0032]
The rotation from the engine is transmitted through a boss 21 welded to the converter cover 2 to rotate the impeller assembly 3 joined to the converter cover 2 by welding. The oil flow generated by this rotation rotates the turbine assembly via the stator 4. Thus, the driving force is transmitted, but when the ratio of the rotational speed of the impeller assembly 3 and the rotational speed of the turbine assembly 6 is a certain value (for example, the rotational speed of the impeller assembly 3 is 100, the rotational speed of the turbine assembly 6 is 80). The torque amplification effect in the stator 4 is lost, and the stator 4 starts to rotate. At this stage, the rotational speeds of the impeller assembly 3 and the turbine assembly 6 do not approach any more. At this time, the lockup clutch 8 is locked up, so that the rotation from the engine is directly transmitted to the turbine assembly 6. Thereby, the rotation of the engine can be transmitted as it is to the output shaft of the torque converter.
[0033]
Thus, since the impeller assembly 3 and the turbine assembly 6 of the torque converter are given the same rotation as the engine, if these rotating bodies are not balanced, noise and vibration are generated, and the function and durability are improved. Incurs a decline. Therefore, the operation of the balance piece welding device for applying the balance piece of the present embodiment to the turbine assembly 6 to achieve balance will be described below.
[0034]
[Operation of balance piece welding equipment]
First, the piston rod 408 is raised by the air cylinder 407 to bring the welding head 406 into a rest position, and then the turbine assembly 6 is placed and fixed on the balancer so as to be similar to the rotation axis C. Then, the balancer is rotated to detect the unbalance amount and the position of the turbine assembly 6.
[0035]
When the rotation of the balancer is stopped and the unbalanced position is stopped just below the welding gun 409, the solenoid valve 417 is opened. Then, the air passes through the vacuum switch 418 and flows out from the silencer 420 to the outside air, and at the same time, the air is sucked in from the pipe line that is orthogonal to the above flow in the vacuum switch 418. Accordingly, external air is sucked from the opening 412 and flows to the vent 413, the gallery 414, the convert filter 419, the vacuum switch 418, and the silencer 420.
[0036]
Therefore, when the balance piece 100 that matches the unbalance amount of the turbine assembly 6 detected by the balancer is selected and pressed against the tip end surface of the lower end of the welding gun 409, air cannot be sucked from the opening 412. The vent 413 and the gallery 414 are evacuated, and the balance piece 100 is adsorbed by the welding gun 409.
[0037]
The balance piece 100 is positioned with respect to the welding gun 409 so that the horizontal cross-sectional shape of the electrode portion 411 matches the arc shape of the balance piece 100. Workability is improved because it can be done.
[0038]
When the balance piece is positioned at the lower end of the electrode portion of the welding gun 409 and is attracted to the tip surface by the negative pressure of the opening 412, the welding gun 409 attached to the welding head is lowered to the welding position by the air cylinder 407. When the protrusion of the balance piece 405 is pressed against the turbine core 63 and a current is passed between the electrode part 411 and the turbine core 63, the protrusion 100a is melted and the balance piece 100 is welded to the turbine core 63. The
[0039]
At this time, since the arc shape of the balance piece 100 coincides with the curvature at the welding position of the turbine core 63, stable welding is performed without wobbling, so that the welding strength is reduced or the balance piece 100 is warped. There is nothing wrong.
[0040]
Further, the balance piece 100 is already positioned and sucked accurately on the front end surface of the welding gun 409 before coming into contact with the turbine core 63, and is lowered as it is vertically by the air cylinder 407 to come into contact with the turbine core 63 and weld. As a result, welding positioning is also accurate.
[0041]
FIG. 3 shows an enlarged view of a turbine runner to which the embodiment of the present invention is applied.
[0042]
In the present embodiment, a very small inner core 63 is used, and when the claw portion 64 is brazed, the gap between the claw portion and the claw portion is very narrow. However, as shown in the figure, since the convex portion 100c including the protruding portion 100a is accommodated between the claw portion 64 and the claw portion 64, and other portions are lifted by the rising portion 100d, the claw portion There is no interference with 64 brazing parts. The distance from the inner core 63 next to the protruding portion that is a welded portion is the end of the convex portion 100c. In the prior art balance piece, the distance from the inner core is the end of the balance piece. Here, the length of the straight line connecting the projection 100a of the balance piece 100 and the end of the projection 100c in the present embodiment and the projection of the balance piece of the prior art and the end of the balance piece are connected. If the lengths of the straight lines are compared, the configuration of the present embodiment is shorter. The lengths of these straight lines are proportional to the range in which the inclination is allowed, and the fact that this embodiment is shorter indicates that the range in which the inclination is allowed is wide. Therefore, it can be reliably welded without contact other than the protrusions due to slight inclination or deflection of the balance piece 100 due to pressing during welding.
[0043]
In addition, the balance piece 100 in the present embodiment is formed such that the height of the rising portion 100 d is greater than the height of the claw portion 64 for fixing the turbine blade 62 to the inner core 63.
[0044]
Therefore, when a certain amount of weight is required for balancing, it has been necessary to avoid the claw portion in the past. Therefore, avoid the claw portion with a balance piece whose size is limited to the size of the gap between the claw portions. However, in the present embodiment, since only the convex portion 100c is accommodated in the gap of the claw portion 64, the balance piece having the necessary weight is welded at one place. Therefore, workability can be improved.
[0045]
In addition, as shown in FIG. 6, a plurality of balance pieces are configured separately, whereas in the present embodiment, it is possible to configure weight in one place, so that the balance can be ensured. Can be taken.
[0046]
When the solenoid valve 417 is closed after the balance piece 100 is welded onto the turbine core 63, the air flow in the vacuum switch 418 stops, so the negative pressure in the opening 412 is also released. Therefore, the welding gun 409 is lifted upward by the air cylinder 407 after the attracting force to the welded balance piece 100 is eliminated.
[0047]
After this, the balancer is rotated again just in case, and the residual unbalance amount and the position of the turbine assembly 6 are rechecked.
[0048]
[Operation and effect of the present embodiment]
The balance piece 100 of the present embodiment is mounted on a balancer welding machine that balances a torque converter having a turbine blade 62 between a turbine shell 61 and an inner core 63 to concentrate sparks during welding. The protrusion 100a is provided, and weight balance is achieved by welding to the inner core 63.
[0049]
At this time, the protruding part 100c is formed on the inner core 63 side by providing the rising part 100d in a direction in which the balance piece 100 is separated from the inner core 63, and the protruding part 100c includes the protruding part 100a.
[0050]
Therefore, the distance from the inner core 63 next to the protrusion 100a which is a welded portion is the end of the convex portion 100c. In the prior art balance piece, the distance from the inner core is the end of the balance piece. Here, a comparison is made between the length of the straight line connecting the protrusion 100a and the end of the convex part 100c and the length of the straight line connecting the protrusion of the balance piece and the end of the balance piece according to the present embodiment. Then, this embodiment has a shorter configuration. The lengths of these straight lines are proportional to the range in which the inclination is allowed, and the fact that this embodiment is shorter indicates that the range in which the inclination is allowed is wide. Therefore, the parts other than the protrusions 100a do not come into contact with each other due to slight inclination or deflection caused by pressing during welding, and welding can be performed reliably.
[0051]
Further, in the balance piece 100 in the present embodiment, the height of the rising portion 100 d is formed to be greater than the height of the claw portion 64 for fixing the turbine blade 62 to the inner core 63.
[0052]
Therefore, when a certain amount of weight is required for balancing, it has been necessary to avoid the claw portion in the past. Therefore, avoid the claw portion with a balance piece whose size is limited to the size of the gap between the claw portions. However, in the present embodiment, since only the convex portion 100c is accommodated in the gap between the claw portions 64, the balance piece 100 having a necessary weight is provided at one location. Since it can provide by welding, workability | operativity can be improved.
[0053]
In addition, a plurality of balance pieces are configured separately as in the prior art, but in this embodiment, the weight can be concentrated in one place, so that a balance can be reliably obtained. it can.
[0054]
(Other embodiments)
As described above, the case where the present invention is applied to the turbine runner of the torque converter has been described based on the drawings, but is not limited to this configuration. Basically, it can be applied to a rotating body, and can also be applied to a fluid transmission device or wheels.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an overall configuration of a torque converter to which an embodiment is applied.
FIG. 2 is a view showing a balance piece according to the embodiment.
FIG. 3 is a diagram showing an application example of the embodiment to a turbine.
FIG. 4 is an overall configuration diagram of the balancer welding apparatus according to the embodiment.
FIG. 5 is a view showing a balance piece of the prior art.
FIG. 6 is a diagram showing an application example of a conventional technology to a turbine.
[Explanation of symbols]
1 Output shaft 2 Converter cover 3 Impeller assembly 4 Stator 5 One-way clutch 6 Turbine assembly 7 Torsion damper 8 Lock-up clutch 21 Boss 22 Washer support 23 Thrust washer 31 Impeller shell 32 Pump impeller 33 Impeller core 34 Support member 51 Bearing support 52 OWC inner race 53 OWC outer race 55 Thrust bearing 61 Turbine shell 62 Turbine runner 63 Turbine core 64 Claw portion 65 Turbine hub 66 Turbine rivet 71 Drive plate 72 Side plate 73 Torsion spring 74 Hub plate 75 Hub 81 Drum 82 Retaining plate 83 Clutch plate 84 Piston 85 Havelock Up 86 Oilway 87 Bush 100 Balun Piece 100a Protruding part 100b End part 100c Protruding part 100d Rising part 200 Balance piece 200a Protruding part 200b End part 406 Welding head 407 Air cylinder 409 Welding gun 411 Electrode part 412 Opening part 413 Vent hole 415 Negative pressure supply means C Rotating shaft R Arc angle

Claims (1)

It is mounted on a balancer welding machine that balances the fluid transmission device with blades between the outer shell and the inner core,
In the balance piece, which has a protrusion for concentrating sparks during welding, and balances the weight by welding to the inner core,
The balance piece is formed with a raised portion in a direction away from the inner core to form a protruding portion protruding toward the inner core, and the protruding portion includes the protruding portion ,
The fluid transmission device balance piece is characterized in that a height of the rising portion is at least equal to or higher than a height of a claw portion for fixing the blade to the inner core .

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