JP2013224703A - Torque converter housing container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a torque converter housing container capable of securing strength at a fixed portion when a joint portion between an impeller shell and a front cover is fixed by a cold spray method.SOLUTION: A joint groove part where a plurality of circumferential grooves are formed from an impeller shell to a front cover is provided in a joint part circumference between the impeller shell and the front cover. A metal layer is formed and the impeller shell and the front cover are fixed at the joint groove part by a cold spray method.

Description

  The present invention relates to a torque converter storage container.

  The following Patent Document 1 discloses a technique for forming a metal layer by a cold spray method.

JP 2010-234756 A

  The impeller shell and the front cover can be integrally fixed by forming a metal layer by a cold spray method at a joint portion between the impeller shell and the front cover of the torque converter storage container. However, the metal layer formed by the cold spray method has a lower strength in the tensile direction than the strength in the shear direction, and if formed at the joint between the impeller shell and the front cover where the force in the tensile direction acts, there is a risk of insufficient strength. It was.

  The present invention has been made paying attention to the above problem, and provides a torque converter storage container capable of securing the strength of a fixing portion when fixing a joint portion between an impeller shell and a front cover by a cold spray method. The purpose is to do.

  In order to achieve the above object, in the torque converter storage container of the present invention, a plurality of circumferential grooves are formed on the outer periphery of the joint portion between the impeller shell and the front cover from the impeller shell to the front cover. A metal layer was formed by a cold spray method to fix the impeller shell and the front cover.

  Therefore, even if a tensile force acts between the impeller shell and the front cover by forming the metal layer in the joining groove, a shearing force acts on the metal layer in the joining groove. Thus, the strength of the joint portion by the metal layer can be ensured.

1 is a partial cross-sectional view of a torque converter according to a first embodiment. FIG. 3 is an enlarged cross-sectional view of a joint portion between the impeller shell and the front cover according to the first embodiment. 6 is an enlarged cross-sectional view of a joint portion between an impeller shell and a front cover according to Embodiment 2. FIG. 6 is an enlarged cross-sectional view of a joint portion between an impeller shell and a front cover according to Embodiment 3. FIG.

[Example 1]
[Overall configuration of torque converter]
FIG. 1 is a partial cross-sectional view of the torque converter 1. As main elements constituting the torque converter 1, a pump impeller 2, a turbine runner 3, a stator 5 including a one-way clutch 4, and a lock-up clutch 7 are provided. Each of these elements is accommodated in the torque converter storage container 6.
The torque converter storage container 6 includes an impeller shell 60 and a front cover 61. The opening 60a on the engine output shaft side of the impeller shell 60 and the opening 61a on the transmission input shaft side of the front cover 61 are fixed by a cold spray method. This fixing method will be described in detail later.
The pump impeller 2 includes a blade-like impeller blade 20 provided on the inner wall of the impeller shell 60.
The turbine runner 3 is arranged at a position facing the pump impeller 2 and includes a turbine shell 30 and a blade-like turbine blade 31 provided inside the turbine shell 30.
The stator 5 is provided between the pump impeller 2 and the turbine runner 3, and includes a base 50 and a blade-shaped stator blade 51 extending in the radial direction from the base 50. Base 50 is provided between transmission housing via one-way clutch 4. The one-way clutch 4 is axially constituted by a needle bearing 80 disposed between an impeller hub 62 fixed to the impeller shell 60 and a needle bearing 81 disposed between the turbine hub 32 fixed to the turbine shell 30. Is positioned.
The lock-up clutch 7 includes a lock-up piston 70 that is slidably held in the axial direction on the turbine hub 32, and a torsion damper 71 that is fixed to the turbine shell 30 with a rivet 82.
The torque converter storage container 6 is filled with oil, and a torque amplifying action is generated by the flow of oil by the blades of the pump impeller 2, the turbine runner 3, and the stator 5.

[Joint structure between impeller shell and front cover]
FIG. 2 is an enlarged cross-sectional view of the vicinity of the opening 60a of the impeller shell 60 on the engine output shaft side and the opening 61a of the front cover 61 on the transmission input shaft side. In order to make the drawing easier to understand, the components inside the torque converter storage container 6 are not shown.
The outer diameter of the opening 60a of the impeller shell 60 is smaller than the inner diameter of the opening 61a of the front cover 61, and constitutes a small diameter portion 60b. On the opposite side of the small-diameter portion 60b from the front cover 61, a large-diameter portion 61c having substantially the same outer diameter as the outer diameter (outer-diameter portion 61b) of the opening 61a of the front cover 61 is formed. A plurality of circumferential grooves of the torque converter storage container 6 are formed from the large-diameter portion 60c of the impeller shell 60 to the outer-diameter portion 61b of the front cover 61, thereby constituting the joining groove portion 6a. The cross section in the axial direction of the joining groove 6a is formed in a so-called sawtooth shape that repeats a peak and a valley.
A metal layer 6b is formed and deposited by the cold spray method over the entire joining groove 6a. The impeller shell 60 and the front cover 61 are integrally fixed by the metal layer 6b. The cold spray method is a technique mainly used when forming a film on a substrate. The metal particles heated in the range below the melting point are placed on a high-speed flow of inert gas and collide with the base material, and physical bonds are obtained by the anchor effect. This makes it possible to form a film that suppresses oxidation. In the first embodiment, this is used as a method of fixing the opening 60a on the engine output shaft side of the impeller shell 60 and the opening 61a on the transmission input shaft side of the front cover 61.

[Action]
A method of forming a metal film by a cold spray method is well known. By forming the metal layer between the two members in the same manner as forming the metal film, welding can be substituted for the fixing method between the two members.
However, if the adhesion of the metal layer to the member near the boundary between the two members is inferior to the adhesion of the metal layer to the member in the part other than the vicinity of the boundary, the bond strength in the tensile direction is insufficient for the metal layer. There is a risk. Further, the strength in the tensile direction of the metal layer formed by the cold spray method is smaller than the strength in the shearing direction.
The torque converter 1 receives the reaction force from the impeller shell 60 because the oil in the torque converter storage container 6 is sent to the turbine runner 3 side by the pump impeller 2. That is, a force acts on the impeller shell 60 in a direction away from the front cover 61. Therefore, a force in the tensile direction acts between the opening 60a on the engine output shaft side of the impeller shell 60 and the opening 61a on the transmission input shaft side of the front cover 61.
To secure the fixing strength between the impeller shell 60 and the front cover 61 only by the tensile strength of the metal layer, it is necessary to make the metal layer thicker, but the amount of metal particles to be used increases, so the cost and weight increase. Cause.
Therefore, in the first embodiment, a joint groove portion 6a in which a plurality of circumferential grooves are formed from the impeller shell 60 to the front cover 61 is provided on the outer periphery of the joint portion between the opening portion 60a of the impeller shell 60 and the opening portion 61a of the front cover 61. A metal layer 6b was formed in the joining groove 6a by a cold spray method, and the impeller shell 60 and the front cover 61 were fixed.

[effect]
In the torque converter storage container 6 according to the first embodiment, the metal layer 6b is formed in the joining groove 6a, so that even if a tensile force acts between the impeller shell 60 and the front cover 61, the joining groove 6a. A shearing force acts on the inner metal layer 6b. Therefore, it is possible to ensure the strength of the joint portion by the metal layer 6b. In addition, since the thickness of the metal layer 6b can be suppressed, the amount of metal particles can be suppressed. Therefore, the cost can be reduced and an increase in the weight of the torque converter 1 can be suppressed.

[Example 2]
The torque converter storage container 6 according to the second embodiment will be described. The torque converter storage container 6 of the second embodiment differs from the torque converter storage container 6 of the first embodiment in the shape of the joining groove 6a. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

[Joint structure between impeller shell and front cover]
FIG. 3 is an enlarged cross-sectional view (FIG. 3A) of the vicinity of the opening 60a on the engine output shaft side of the impeller shell 60 and the opening 61a on the transmission input shaft side of the front cover 61, and the joining groove 6a. It is an expanded sectional view (Drawing 3 (b)). In order to make the drawing easier to understand, the components inside the torque converter storage container 6 are not shown.
As shown in FIG. 3, the axial cross-sectional shape of the circumferential groove of the joining groove 6a of the impeller shell 60 and the front cover 61 is formed so that the peak of the peak and the peak of the valley are curved.

[effect]
In the torque converter storage container 6 of the second embodiment, compared to the case where the peak of the peak and the peak of the valley of the joint groove 6a are corners, the collision particles are generated by cold spray at the peak of the peak and the peak of the valley. It is easy to adhere and it becomes easy to make the material of the metal layer 6b uniform. Therefore, stress concentration when a force in the tensile direction acts on the part can be prevented, so that the strength of the joined part by the metal layer 6b can be improved.

Example 3
The torque converter storage container 6 according to the third embodiment will be described. The torque converter storage container 6 of the third embodiment is different from the torque converter storage container 6 of the first embodiment in the shape of the joining groove 6a. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

[Joint structure between impeller shell and front cover]
FIG. 4 is an enlarged sectional view (FIG. 4A) in the vicinity of the opening 60a on the engine output shaft side of the impeller shell 60 and the opening 61a on the transmission input shaft side of the front cover 61, and the joining groove 6a. It is an expanded sectional view (Drawing 4 (b)). In order to make the drawing easier to understand, the components inside the torque converter storage container 6 are not shown.
As shown in FIG. 4, the axial cross-sectional shape of the circumferential groove of the joint groove portion 6a of the impeller shell 60 and the front cover 61 is formed so that the angle α of the inclined surface is 45 degrees or less. [effect]
In the torque converter storage container 6 of the third embodiment, even when the spray gun is installed perpendicular to the shaft of the torque converter storage container 6, the metal particles can collide obliquely with the joint groove 6a. It becomes. Therefore, the plastic deformation of the metal particles can be promoted to make the metal particles adhere more firmly, and the strength of the joint portion by the metal layer 6b can be improved. Furthermore, since the angle α of the slope is 45 degrees or less, the repulsion of particles with respect to the substrate can be reduced, and the adhesion rate of the metal layer and the strength of the metal layer can be improved.

[Other Examples]
As mentioned above, although this invention was demonstrated based on Example 1 thru | or Example 3, the concrete structure of each invention is not limited to Example 1 thru | or Example 3, and the range which does not deviate from the summary of invention. Such design changes are included in the present invention.

1 Torque converter
2 Pump impeller
3 Turbine runner
6 Torque converter containment
6a Joining groove
6b metal layer
60 Impeller shell
61 Front cover

Claims (3)

An impeller shell having an impeller blade of a pump impeller on the inner wall;
A front cover that fits the open end of the impeller shell and defines a working fluid filling space therein;
On the outer periphery of the joint portion between the impeller shell and the front cover, a joint groove portion in which a plurality of circumferential grooves are formed from the impeller shell to the front cover,
Provided,
A torque converter storage container, wherein a metal layer is formed in the joining groove portion by a cold spray method, and the impeller shell and the front cover are fixed. The containment vessel of the torque converter according to claim 1,
The torque converter storage container according to claim 1, wherein an axial cross-sectional shape of the circumferential groove of the joining groove portion is a curved shape with an apex of a peak portion and an apex of a valley portion. In the containment vessel of the torque converter according to claim 1 or 2,
The torque converter storage container characterized in that the circumferential cross-sectional shape of the circumferential groove of the joining groove portion has a slope angle of 45 degrees or less.

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