JP4774414B2 - Piston head and piston head member - Google Patents

Description

  The present invention relates to a piston head mounted on a piston used in various fields such as an automobile cooler and an indoor cooler, and a head member constituting the piston head.

  In this type of piston head, two head members A are connected as shown in FIG. The piston head B is welded and fixed to the two piston bodies P as shown in FIG. 5, and then cut off from the XX portion of FIG.

  In the conventional piston head B, the protrusions C of the two head members A shown in FIGS. 6A and 6B are abutted, and the abutting surfaces D of the protrusions C are spot-welded and connected. The head member A is made of aluminum and is machined by machining.

  The conventional piston head B is difficult to be joined because the projection C is flat, and is insufficiently connected, so that it is separated from the joined portion before welding to the piston body P (FIG. 5), and is opposed as shown in FIG. There was a problem that welding to the two piston bodies P was impossible at the same time.

In the piston head of the present application, as described in claim 1, two head member joining protrusions are brought into contact with each other and diffusion joined, and each head member has an internal space on one end side and a circular blocking surface on the other end side. A circular dish-like shape, provided with an insertion edge at the outer peripheral edge of the internal space, provided with the joint protrusion at the center of the circular blocking surface, and the outer peripheral edge of the diffusion-bonded two head members as the piston body welding is fixed, the piston head wherein two head members after welding fixation is cut at the junction protrusion side, joining projections of the head member each is projected in a ring closing surface of the circular, the joint projection is a spread hem on the outside and the inside of the said ring toward the closed side, the top portion is a narrow flat width, the top portions of the two head members are diffusion bonded are butted That. According to a second aspect of the present invention, the foreign matter generated at the time of joining may be attached to the outer periphery of the diffusion joining portion of the two head members, or the foreign matter may be removed.

In the head member of the present application, as described in claim 3, the joining projections of the two head members are abutted and diffusion-bonded, and each head member has an internal space on one end side and a circular closure on the other end side. A circular dish having a surface, an insertion edge on the outer peripheral edge of the internal space, the bonding protrusion at the center of the circular blocking surface, and the outer peripheral edge portions of the two head members that are diffusion-bonded. is welded to the piston body, said the head member in which two head members are used for the piston head to be cleaved at the junction protrusion side, the joining collision force is projected in a ring closing surface of the circular after welded The joining protrusions are flared toward the outer and inner sides of the ring toward the closed surface, and the tops of the joining protrusions have a narrow planar shape .

The piston head and head member of the present invention have the following effects.
(1) Since the narrow top portions are butted together and diffusion-bonded, the bonding strength is improved and, of course, before welding to the piston body, it is not separated by post-processing after welding.
(2) Since the top portion is flat, positioning at the time of butting is easy and reliable.
(3) Since the joint protrusion is widened at the bottom, the joint protrusion is not easily deformed even when pressure is applied during diffusion bonding.

  An example of an embodiment of the piston head and head member of the present invention is shown below. The piston head 1 shown in FIG. 1 has two joining projections 3 of the head member 2 shown in FIG. The head member 2 is made of aluminum or silicon alloy. An aluminum alloy containing about 6% silicon is suitable from the viewpoint of wear resistance when mounted on and fixed to the piston body.

As shown in FIGS. 3 (a) and 3 (b), the head member 2 is a circular dish having a hollow inside (referred to as "internal space 10") , one axially open, and the other closed. A butt protrusion 3 is provided on the surface 4 and an insertion edge 5 is formed on the outer peripheral edge of the opening, which can be inserted into the opening of the piston body P (FIG. 5). The insertion edge 5 has a ring shape smaller in diameter than the large diameter portion 6 of the head member 2. The head member 2 can be formed by machining, and can be press-molded if possible.

  The joint protrusion 3 has a ring shape, its skirt 7 is formed so as to widen the outer and inner sides of the ring, and the top 8 has a narrow planar shape. The height of the joining projection 3, the spreading angle of the skirt 7, the width of the top 8 can be determined freely. Depending on the diameter of the large-diameter portion 6 of the head member 2, the height of the joining protrusion 3, the width of the hem, etc. The width of the top 8 is suitably about 0.5 mm to 0.7 mm, for example.

  The top portions 8 of the joint protrusions 3 of the two head members 2 are diffusion-bonded and connected in a state of butting. As in the existing diffusion bonding, a pulse current is used for the diffusion bonding, and pressure is applied. For example, a pulse current having a pulse width of 30 ms or 15 ms or less is suitable as the current. The current and voltage can be selected to be values suitable for diffusion bonding. The pressure applied to the two joining protrusions 3 that have been butted together depends on the current, voltage, width of the top 8, total area, etc., but can be, for example, about 2 tons.

  Due to the application and application of the pulse current, the abutted top 8 is heated and pressurized to cause a diffusion phenomenon between the joint surfaces and to be integrated metallurgically. At this time, the top portion 8 and the metal in the vicinity thereof are deformed by plastic flow, the oxide film on the top portion 8 is destroyed, and the broken oxide film and foreign matter (hereinafter referred to as “foreign matter”) 9 (FIG. 1) It sticks out to the outer periphery. The protrusion size and vertical gutter of the foreign material 9 vary depending on the amount of the foreign material 9. The foreign material 9 can also be removed.

(A) is a perspective view which shows an example of the piston head of this invention, (b) is a side view of (a). The YY partial sectional view of Drawing 1 (a). (A) is a perspective view which shows an example of the head member of this invention, (b) is ZZ partial sectional drawing of (a). The perspective view which shows an example of the conventional piston head. Explanatory drawing in the case of fixing the conventional piston head to a piston main body by welding. (A) is a perspective view of the conventional head member, (b) is a WW partial sectional view of (a).

DESCRIPTION OF SYMBOLS 1 Piston head 2 Head member 3 Joining protrusion of head member 4 Blocking surface of head member 5 Insertion edge of head member 6 Large diameter part of head member 7 Bottom of joining protrusion 8 Top part of joining protrusion 9 Foreign object
10 Internal space A Head member B Piston head C Protrusion of head member D Abutting surface P Piston body

Claims (3)

The bonding projections of the two head members are abutted and diffusion bonded, and each head member has a circular dish shape having an internal space on one end side and a circular blocking surface on the other end side. An insertion edge is provided at the periphery, the joint protrusion is provided at the center of the circular blocking surface, and the outer peripheral edges of the two head members that are diffusion-bonded are welded and fixed to the piston body, and the two head members are fixed after welding. In the piston head that is cut on the joining projection side ,
Joining projection of the head member each is projected in a ring closing surface of the circular, the joint projection is a spread hem on the outside and the inside of the said ring toward the closed side, the top portion of the width A narrow plane,
The tops of the two head members are butted together and diffusion bonded ,
A piston head characterized by that. In claim 1 Symbol mounting the piston head,
A piston head in which foreign matter generated during joining is attached to the outer periphery of the diffusion joining portion of two head members, or foreign matter is removed. The bonding projections of the two head members are abutted and diffusion bonded, and each head member has a circular dish shape having an internal space on one end side and a circular blocking surface on the other end side. An insertion edge is provided at the periphery, the joint protrusion is provided at the center of the circular blocking surface, and the outer peripheral edges of the two head members that are diffusion-bonded are welded and fixed to the piston body, and the two head members are fixed after welding. In the head member used for the piston head that is cut on the joining projection side ,
The joint impact force is projected in a ring closing surface of the circular, the joint projection is a spread hem on the outside and the inside of the said ring toward the closed side, a narrow flat with its top width is there,
A piston head member.

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