JP2012021607A - Power transmission component and fluid type power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power transmission component which can reduce the influence of brazing on quenching.SOLUTION: A turbine 19 includes a turbine shell 19a, a turbine blade 19b, and a driven plate 53. The turbine blade 19b has a first claw 25b. The first claw 25b is brazed on the turbine shell 19a. The driven plate 53 has a projection 53b and is fixed on the turbine shell 19a. The hardness of the projection 53b is larger than the hardness of the turbine shell 19a. The turbine shell 19a has an annular groove 26d for controlling the flow of a brazing material from the first claw 25b to the driven plate 53.

Description

  The present invention relates to a power transmission component and a fluid power transmission device using the same.

  Various power transmission components are used in an apparatus for transmitting power. For example, a fluid power transmission device is known as a device for transmitting power. The fluid power transmission device is a device that transmits torque from an engine to a transmission side via a working fluid, and includes a front cover, an impeller, a turbine, and a stator.

  The front cover is connected to the crankshaft of the engine. The impeller is fixed to the front cover. A fluid chamber filled with the working fluid is formed by the front cover and the impeller. The turbine is disposed opposite the impeller in the fluid chamber. The power input to the front cover is transmitted from the impeller to the turbine via the working fluid, and is output to the input shaft of the transmission via the turbine.

JP 2003-148588 A

  For example, the impeller described in Patent Document 1 is used for the fluid power transmission device. This type of impeller is often brazed to connect the components together.

  On the other hand, in consideration of breakage and wear, a part of the impeller is often quenched.

  However, if the part to be quenched is close to the brazed part, the heat is taken away by the brazing material during quenching, and the temperature of the part to be quenched does not rise as expected, and the quenching hardness may decrease. .

  The subject of this invention is providing the power transmission component which can reduce the influence which brazing has on quenching.

  The power transmission component according to the present invention includes a first member, at least one second member, and at least one third member. The second member has a first fixing portion. The first fixing portion is brazed to the first member. The third member has at least one quenching portion and is fixed to the first member. The hardness of the quenched portion is higher than the hardness of the first member. The 1st member has a control part which controls a flow of brazing material from the 1st fixed part to the 3rd member.

  In this power transmission component, since the first member has a suppressing portion that suppresses the flow of the brazing material from the first fixing portion to the third member, when brazing the first fixing portion to the first member The brazing material is less likely to flow from the first fixed portion to the third member. Therefore, when heating a hardening part, it can suppress that a heat | fever is transmitted to a brazing material and can suppress the reduction of the quenching temperature by a brazing material.

  As described above, the present invention can provide a power transmission component that can reduce the influence of brazing on quenching.

Schematic cross section of torque converter Schematic cross section of turbine Partial plan view of turbine Partial section of turbine (A), (B) Partial sectional view of a turbine (another embodiment)

<Configuration>
As shown in FIG. 1, the torque converter 1 (an example of a fluid type power transmission device) includes a front cover 14, an impeller 18, a turbine 19 (an example of a power transmission component), a stator 20, and a lockup device 7.

(1) Front cover The front cover 14 is a disk-shaped member, and power generated by an engine (not shown) is input thereto. The front cover 14 is connected to an engine crankshaft (not shown) via a flexible plate (not shown). The front cover 14 rotates about the rotation axis O.

(2) Impeller The impeller 18 is fixed to the front cover 14. The front cover 14 and the impeller 18 form a fluid chamber filled with working oil (an example of working fluid). The impeller 18 includes an impeller shell 22, a plurality of impeller blades 23, an impeller hub 24, and an impeller core 36.

  The impeller shell 22 is an annular plate member and is fixed to the front cover 14. The impeller blade 23 is fixed to the impeller shell 22. The impeller hub 24 is fixed to the inner peripheral portion of the impeller shell 22. The impeller core 36 is an annular member fixed to the plurality of impeller blades 23 and connects the plurality of impeller blades 23.

(3) Turbine As shown in FIG. 1, the turbine 19 is connected to an input shaft (not shown) of a transmission (not shown), and is disposed in the fluid chamber. The turbine 19 includes a turbine shell 19a (an example of a first member), a plurality of turbine blades 19b (an example of a second member), a turbine core 19c, a turbine hub 19d, and a driven plate 53 (an example of a third member). Yes.

  As shown in FIG. 2, the turbine shell 19a is an annular member having a central axis X, and is connected to the turbine hub 19d by a rivet 19e. The center axis X of the turbine shell 19a substantially coincides with the rotation axis O. The turbine shell 19a includes a shell main body portion 28a to which the turbine blade 19b is fixed, and an inner peripheral fixing portion 28b to which the turbine hub 19d is fixed. The inner peripheral fixing portion 28b is disposed on the inner peripheral side of the shell main body portion 28a, and is fixed to the turbine hub 19d by a rivet 19e. More specifically, the turbine hub 19d includes a cylindrical hub main body 27a and an annular flange portion 27b protruding from the hub main body 27a to the outer peripheral side. The inner periphery fixing part 28b is fixed to the flange part 27b by a rivet 19e.

  An annular recess is formed in the shell main body 28a by, for example, pressing. A plurality of turbine blades 19b are arranged in this recess. As shown in FIGS. 2 and 3, the shell body 28a includes a plurality of second slits 26a, a plurality of first slits 26b, a plurality of third slits 26c, and an annular groove 26d (an example of a suppressing portion). ,have.

  As shown in FIG. 3, the plurality of first slits 26b are arranged at predetermined intervals in the circumferential direction. Each first slit 26b is inclined with respect to the circumferential direction and the radial direction. A first claw 25b of a turbine blade 19b described later is inserted into the first slit 26b. The first slit 26b is disposed closer to the driven plate 53 than the second slit 26a and the third slit 26c.

  The plurality of second slits 26a are arranged at predetermined intervals in the circumferential direction. Each second slit 26a is inclined with respect to the circumferential direction and the radial direction. A second claw 25a of a turbine blade 19b described later is inserted into the second slit 26a.

  The plurality of third slits 26c are arranged at predetermined intervals in the circumferential direction. Each third slit 26c is inclined with respect to the circumferential direction and the radial direction. A third claw 25c of a turbine blade 19b described later is inserted into the third slit 26c.

  As shown in FIGS. 3 and 4, the annular groove 26 d is provided to suppress the flow of the brazing material from the first claw 25 b (described later) of the turbine blade 19 b to the driven plate 53, and is around the central axis X. It is formed in an annular shape. The annular groove 26d is formed in the turbine shell 19a by, for example, pressing. The annular groove 26d may be formed by other methods such as cutting.

  The annular groove 26d is disposed on the outer peripheral side of the plurality of first slits 26b, and is disposed on the inner peripheral side of the plurality of third slits 26c. The annular groove 26d is closest to the first slit 26b among the second slit 26a, the first slit 26b, and the third slit 26c, and is adjacent to the first slit 26b. The second slit 26a and the first slit 26b are disposed inside the annular groove 26d and are surrounded by the annular groove 26d. The first claw 25b is inserted into the first slit 26b, and the first claw 25b is brazed around the first slit 26b of the turbine shell 19a.

  The plurality of turbine blades 19b are arranged around the central axis X at a predetermined interval. Each turbine blade 19b includes a blade body 25d, a first claw 25b (an example of a first fixing portion), a second claw 25a (an example of a second fixing portion), and a third claw 25c (an example of a second fixing portion). ) And. The blade body 25d is disposed on the side close to the impeller blade 23 of the turbine shell 19a (the side close to the impeller blade 23 of the shell body portion 28a).

  The 1st nail | claw 25b is arrange | positioned rather than the 2nd nail | claw 25a, and is inserted in the 1st slit 26b. The tip of the first claw 25b is bent along the side surface of the turbine shell 19a and brazed to the turbine shell 19a. The 1st nail | claw 25b is arrange | positioned near the driven plate 53 rather than the 2nd nail | claw 25a and the 3rd nail | claw 25c.

  The second claw 25a is inserted into the second slit 26a. The tip of the second claw 25a is bent along the side surface of the turbine shell 19a and brazed to the turbine shell 19a.

  The 3rd nail | claw 25c is arrange | positioned rather than the 1st nail | claw 25b at the outer peripheral side, and is inserted in the 3rd slit 26c. The tip of the third claw 25c is bent along the side surface of the turbine shell 19a and brazed to the turbine shell 19a.

  The turbine core 19c is an annular member fixed to the plurality of turbine blades 19b, and connects the plurality of turbine blades 19b.

  The plurality of driven plates 53 are arranged at predetermined intervals in the circumferential direction of the turbine shell 19a, and are fixed to the lockup device 7 side of the turbine shell 19a. In the present embodiment, the driven plate 53 is a separate member from the turbine shell 19a and is in contact with the turbine shell 19a.

  Specifically, the driven plate 53 includes a main body portion 53a and a projection portion 53b (an example of a quenching portion). The main body 53a is fixed to the turbine shell 19a. The protrusion 53 b protrudes in the axial direction from the main body 53 a and abuts on the coil spring 54 of the lockup device 7. It can also be said that the main body 53a is connected to the protrusion 53b. In consideration of damage and wear, the protrusion 53b is subjected to induction hardening. Therefore, the hardness of the protrusion 53b is higher than the hardness of the turbine shell 19a and higher than the hardness of the turbine blade 19b. Moreover, the hardness of the protrusion 53b is higher than the hardness of the main body 53a.

  The driven plate 53 is disposed outside the annular groove 26d. The annular groove 26 d is disposed between the first claw 25 b and the driven plate 53. The turbine shell 19a includes a first area A1 where the second claws 25a and the first claws 25b are arranged, a second area A2 where the driven plate 53 is arranged adjacent to the first area A1, and a third claw 25c. A third region A3. The first region A1 is an annular region, the second region A2 is an annular region disposed on the outer peripheral side of the first region A1, and the third region A3 is an annular region disposed on the outer peripheral side of the second region A2. It is an area. The annular groove 26d is disposed between the first region A1 and the second region A2. More specifically, the annular groove 26d is disposed at the boundary between the first region A1 and the second region A2. It can also be said that the first region A1 and the second region A2 are partitioned by the annular groove 26d.

(4) Stator The stator 20 is a mechanism for rectifying the flow of hydraulic fluid that returns from the turbine 19 to the impeller 18, and is disposed between the impeller 18 and the turbine 19. The stator 20 includes an annular carrier 29, a plurality of stator blades 30 provided on the outer peripheral surface of the carrier 29, and an annular core 31 that connects the plurality of stator blades 30. The carrier 29 is supported by a fixed shaft (not shown) via a one-way clutch 35.

  A first thrust bearing 39 is disposed between the impeller hub 24 and the carrier 29. A second thrust bearing 40 is disposed between the retainer 34 and the turbine hub 19d.

(5) Lock-up device The lock-up device 7 includes a piston member 44 and a damper mechanism 45. The piston member 44 is a disk-shaped member that is disposed close to the axial engine side of the front cover 14. An inner peripheral cylindrical portion 48 extending toward the axial transmission side is formed on the inner peripheral portion of the piston member 44. The inner peripheral cylindrical portion 48 is supported on the outer peripheral surface of the turbine hub 19d so as to be capable of relative rotation and axial movement. The axial transmission side end of the inner peripheral cylindrical portion 48 abuts against the flange portion of the turbine hub 19d, so that the movement toward the axial transmission side is limited to a predetermined position. A seal ring 49 is disposed on the outer peripheral surface of the turbine hub 19 d, and the seal ring 49 seals an axial space in the inner peripheral portion of the piston member 44.

  The outer peripheral portion of the piston member 44 functions as a clutch coupling portion. An annular friction facing 46 is fixed on the engine side of the outer periphery of the piston member 44. The friction facing 46 is opposed to an annular and flat friction surface formed on the inner surface of the outer peripheral portion of the front cover 14.

  The damper mechanism 45 includes a retaining plate 52 and a plurality of coil springs 54. The retaining plate 52 is fitted to the turbine 19 side of the outer peripheral portion of the piston member 44. The retaining plate 52 has a cut-and-raised portion for storing and supporting the coil spring 54. The plurality of coil springs 54 are accommodated in the retaining plate 52, and both ends in the circumferential direction are supported by the retaining plate 52. A protrusion 53b of the driven plate 53 is inserted between adjacent coil springs 54. The protrusion 53b is in contact with the end of the coil spring 54 in the rotational direction.

<Assembly method of turbine>
Here, an assembling method of the turbine 19 will be described.

  First, a plurality of driven plates 53 are fixed to the turbine shell 19a by spot welding. More specifically, the main body 53a of the driven plate 53 is fixed to the turbine shell 19a by spot welding.

  Next, a plurality of turbine blades 19b are assembled to the turbine shell 19a. Specifically, the second claw 25a, the first claw 25b, and the third claw 25c of the turbine blade 19b are inserted into the second slit 26a, the first slit 26b, and the third slit 26c of the turbine shell 19a. After the insertion, the tip of the second claw 25a, the tip of the first claw 25b, and the tip of the third claw 25c are bent in the circumferential direction. For example, when the second claws 25a are bent, the tips of the plurality of second claws 25a are sequentially pressed against the turbine shell 19a by rollers (not shown). The same applies to the first claw 25b and the third claw 25c.

  After the bending operation, the second claw 25a, the first claw 25b, and the third claw 25c are brazed to the back surface of the turbine shell 19a. Specifically, a brazing material mainly composed of copper is disposed between the turbine shell 19a and the turbine blade 19b, and the turbine shell 19a and the turbine blade 19b are heated to the melting point of the brazing material. When the brazing material melts, the melted brazing material spreads around the second claw 25a, the first claw 25b and the third claw 25c, and when cooled, the brazing material solidifies, and the second claw 25a, the first claw 25b and the first claw Three claws 25c are fixed to the turbine shell 19a. When the brazing material melts, the annular groove 26d prevents the brazing material from flowing from the first claw 25b to the driven plate 53. Therefore, the brazing material does not spread on the outer peripheral side of the annular groove 26 d and does not reach the driven plate 53.

  After the brazing operation, induction hardening is performed on the protrusion 53 b of the driven plate 53. Specifically, electromagnetic induction by high-frequency electromagnetic waves is generated on the protrusions 53b. When the temperature of the protrusion 53b reaches a predetermined temperature, the protrusion 53b is cooled and quenched.

  As described above, since the brazing material does not spread on the outer peripheral side of the annular groove 26d during brazing, the brazing material can be prevented from adhering to the driven plate 53. Therefore, heat can be prevented from escaping from the driven plate 53 to the brazing material during induction hardening, and the brazing material can be prevented from affecting the induction hardening of the protrusion 53b.

<Other embodiments>
The specific configuration of the present invention is not limited to the above-described embodiment, and various changes and modifications can be made without departing from the scope of the invention.

  (1) In the above-described embodiment, the power transmission member is described by taking the turbine 19 of the torque converter 1 as an example, but the power transmission member is not limited to the turbine 19. Further, the power transmission component is not limited to a component used in a fluid power transmission device such as the torque converter 1. The power transmission member includes a first member, at least one second member having at least one first fixing portion brazed to the first member, and at least one quenching portion having a hardness higher than that of the first member. And at least one third member fixed to the first member. Although the first member has been described by taking the turbine shell 19a as an example, the first member is not limited to the turbine shell 19a. For example, the first member may be a circular member instead of a ring.

  (2) In the above-described embodiment, the suppression portion has been described by taking the annular groove 26d as an example, but the suppression portion may be other as long as the flow of brazing material from the first fixing portion to the third member can be suppressed. You may have the structure of. For example, the suppressing portion may be a groove extending in an arc instead of an annular shape. In this case, it is preferable that the suppressing portion is disposed at least between the driven plate 53 and the first claw 25b. Moreover, the suppression part should just contain at least one among a groove | channel and a protrusion part. For example, as shown in FIG. 5 (A), the suppressing part may include a protruding part 126b, and as shown in FIG. 5 (B), the suppressing part may include a protruding part 226b and a groove 226e. .

  (3) In the above-described embodiment, the first fixing portion is described by taking the first claw 25b as an example, but the first fixing portion is not limited to the first claw 25b. In the case where the second member has a plurality of brazed portions, the brazed portion closest to the third member is the first fixed portion. Moreover, in the above-mentioned embodiment, the 1st fixing | fixed part (1st nail | claw 25b) is arrange | positioned inside the suppression part (annular groove 26d), and the 3rd member (driven plate 53) is a suppression part (annular groove 26d). However, the first fixing portion may be disposed outside the suppressing portion, and the third member may be disposed inside the suppressing portion.

  (4) In the above-described embodiment, the third member (driven plate 53) is a separate member from the first member (turbine shell 19a), but the third member may be integrally formed with the first member.

  (5) In the above-described embodiment, the third member (driven plate 53) includes the main body 53a and the protrusion 53b. However, a case where only the protrusion 53b is included is also conceivable. Moreover, although the main-body part 53a is not hardened, the main-body part 53a and the projection part 53b may be hardened.

1 Torque converter (an example of a fluid power transmission device)
14 Front cover (example of input member)
18 Impeller (an example of an input member)
19 Turbine (an example of a power transmission component)
19a Turbine shell (example of first member)
19b Turbine blade (example of second member)
19c Turbine core 25b 1st claw (an example of the 1st fixed part)
25a 2nd nail (an example of the 2nd fixed part)
25c 3rd claw (an example of the 2nd fixed part)
26a 1st slit 26b 2nd slit 26c 3rd slit 26d Annular groove | channel (an example of a suppression part)
53 Driven plate (example of third member)
53a Main unit (an example of main unit)
53b Projection (an example of a quenching part)

Claims (10)

A first member;
At least one second member having a first fixing portion brazed to the first member;
And at least one third member having at least one quenching part having a hardness higher than that of the one member and fixed to the first member,
The first member has a suppressing portion that suppresses the flow of brazing material from the first fixing portion to the third member.
Power transmission parts. The suppressing portion is disposed between the first fixing portion and the third member.
The power transmission component according to claim 1. The suppressing portion includes at least one of a groove and a protruding portion,
The power transmission component according to claim 1 or 2. The first member is an annular or circular member having a central axis,
The suppressing portion is formed in an annular shape around the central axis,
The power transmission component according to claim 1. The first fixing part is disposed inside the suppressing part,
The third member is disposed outside the suppressing portion,
The power transmission component according to claim 4. The first member has a first region in which the first fixing portion is disposed, and a second region in which the third member is disposed adjacent to the first region,
The suppression unit is disposed between the first region and the second region.
The power transmission component according to claim 1. The third member is a separate member from the first member, and is in contact with the first member.
The power transmission component according to claim 1. The third member has a body portion fixed to the first member and connected to the quenching portion.
The power transmission component according to claim 1. The second member has a second fixing portion brazed to the first member,
The first fixing portion is disposed closer to the third member than the second fixing portion.
The power transmission component according to claim 1. An input member arranged to receive power and having a fluid chamber;
A working fluid filled in the fluid chamber;
The power transmission component according to any one of claims 1 to 9 disposed in the fluid chamber;
A fluid type power transmission device.

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