Common rail, common rail holder, and method of producing common rail
View Patent ↗The present invention provides a common rail formed by bonding a common rail body and a common rail holder which has a pressing surface and a convex bonding surface, by means of a heat pressure bonding process and a liquid phase diffusion bonding process, wherein the height H of the convex bonding surface satisfies 1 μm≦H≦50 μm, and the common rail holder includes a deformation introducing portion in which an area of a cross-section parallel to the pressing surface is smaller than the area of the pressing surface.
1. A common rail formed by bonding a common rail body and a common rail holder which has a pressing surface and a convex bonding surface, by means of a heat pressure bonding process and a liquid phase diffusion bonding process, wherein:
a height H of the convex bonding surface satisfies
1 μm≦ H≦ 50 μm; and
the common rail holder includes a deformation introducing portion in which an area of a cross-section parallel to the pressing surface is smaller than an area of the pressing surface.
2. The common rail according to claim 1 , wherein:
the height h of the deformation introducing portion before the heat pressure bonding process satisfies
1.0 mm≦ h≦ 5.0 mm; and
a wall thickness T at the pressing surface and a wall thickness t at the convex bonding surface satisfy
0.3 mm≦ T−t≦ 1 mm.
3. The common rail according to claim 1 or 2 , wherein
an outside diameter D of the convex bonding surface and a wall thickness t at the convex bonding surface before the heat pressure bonding process satisfy
4.35≦ D/t≦ 21.7.
4. The common rail according to claim 1 or 2 , wherein
an outside diameter D of the convex bonding surface, a wall thickness t at the convex bonding surface, and a height h of the deformation introducing portion satisfy
D/t≦h/ 0.23.
5. The common rail according to claim 1 or 2 , wherein
a thickness of the deformation introducing portion is tapered toward the convex bonding surface.
6. A common rail holder having a pressing surface and a convex bonding surface for forming a common rail by being bonded to a common rail body, by means of a heat pressure bonding process and a liquid phase diffusion bonding process, wherein:
a height H of the convex bonding surface satisfies
1 μm≦ H≦ 50 μm;
the common rail holder includes a deformation introducing portion in which an area of a cross-section parallel to the pressing surface is smaller than an area of the pressing surface;
a height h of the deformation introducing portion satisfies
1.0 mm≦ h≦ 5.0 mm; and
a wall thickness T at the pressing surface and a wall thickness t at the convex bonding surface satisfy
0.3 mm≦ T−t≦ 1 mm.
7. The common rail holder according to claim 6 , wherein
an outside diameter D of the convex bonding surface and a thickness t at the convex bonding surface satisfy
4.35≦ D/t≦ 21.7.
8. The common rail holder according to claim 6 or 7 , wherein
an outside diameter D of the convex bonding surface, a wall thickness t at the convex bonding surface, and the height h of the deformation introducing portion satisfy
D/t≦h/ 0.23.
9. The common rail holder according to claim 6 or 7 , wherein
a thickness of the deformation introducing portion is tapered toward the convex bonding surface.
10. A method of producing a common rail formed by bonding a common rail body and a common rail holder which has a pressing surface and a convex bonding surface, comprising:
performing a heat pressure bonding process to form a molten pressure-bonded portion by arranging an amorphous alloy metal foil between the common rail body and the common rail holder, the common rail holder having a deformation introducing portion in which an area of a cross-section parallel to the pressing surface is smaller than an area of the pressing surface, and
performing a liquid phase diffusion bonding process by heating the molten pressure-bonded portion to a temperature of melting point of the amorphous alloy metal foil or higher, and holding the temperature to solidify the molten pressure-bonded portion.
11. The method of producing the common rail according to claim 10 , wherein
a height h of the deformation introducing portion before the heat pressure bonding process satisfies:
1.0 mm≦h≦5.0 mm; and
a wall thickness T of the pressing surface and a wall thickness t at the convex bonding surface satisfy
0.3 mm≦ T−t ≦1 mm.
12. The method of producing the common rail according to claim 10 or 11 , wherein
an outside diameter D of the convex bonding surface and a wall thickness t at the convex bonding surface before the heat pressure bonding process satisfy
4.35 ≦D/t≦ 21.7.
13. The method of producing the common rail according to claim 10 or 11 , wherein
an outside diameter D of the convex bonding surface, a wall thickness t at the convex bonding surface, and a height h of the deformation introducing portion satisfy
D/t≦h/ 0.23.
14. The method of producing the common rail according to claim 10 or 11 , wherein
a thickness of the deformation introducing portion is tapered toward the convex bonding surface.