Friction welding all-steel piston

Abstract

The utility model discloses a friction welding all-steel piston which comprises an oil cavity cover plate, a piston head and a piston skirt, the piston head and the piston skirt are of a split structure and are connected in a welding mode, and a closed oil cavity is defined by the oil cavity cover plate, the piston head and the piston skirt. According to the friction welding all-steel piston, a novel piston structure is adopted, the machining efficiency of the piston can be improved, and the production cost can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of internal combustion engine pistons, and in particular to a friction welded all-steel piston. Background Art

[0002] At present, the steel pistons of internal combustion engines are mainly made of quenched and tempered steel 42CrMo4 or microalloyed steel 38MnVS6, and the forming methods include integral welding and oil chamber cover plate. Among them, the most core engineering problem is how to form an internally cooled hollow oil chamber in the steel piston head. When the engine is working, the oil nozzle sprays cooling oil into the oil chamber to cool the piston head to ensure that the piston works normally within the safe temperature range.

[0003] The existing oil cavity cover plate type all-steel piston is mainly composed of a piston body and an oil cavity cover plate. Each piston body is equipped with two oil cavity cover plates to form a piston. The oil cavity of the piston body is a C-shaped semi-enclosed structure. During the machining process, a variety of special tool and tool rod systems are required, which is difficult to process, costly, and has a long cycle. The inner cavity of the piston body is deep, and the forging processability is poor. The inner cavity of the piston body is deep, and the final molding requires mechanical finishing, which also has the disadvantages of being difficult to process, costly, and having a long cycle. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a friction welded all-steel piston, which adopts a new piston structure and can improve the processing efficiency of the piston and reduce the production cost.

[0005] The technical solution provided by the utility model is as follows:

[0006] A friction welded all-steel piston comprises an oil chamber cover plate, a piston head and a piston skirt, wherein the piston head and the piston skirt are split structures and connected by welding; the oil chamber cover plate, the piston head and the piston skirt enclose a closed oil chamber.

[0007] Preferably, the oil chamber cover plate is an integral structure.

[0008] Preferably, the oil chamber cover plate is an annular structure, and oil holes are arranged on the oil chamber cover plate.

[0009] Preferably, the oil chamber at the piston head is an open structure.

[0010] Preferably, a groove for fixing the oil chamber cover plate is provided on the piston head.

[0011] Preferably, an upper annular support is provided on the inner side of the piston head, and a lower annular support is provided on the outer side of the piston skirt, and the upper annular support is welded to the lower annular support.

[0012] Preferably, a welding horn is formed at the welding connection between the upper annular support and the lower annular support, and the lower side of the welding horn abuts against one side of the oil chamber cover plate.

[0013] Preferably, a cover plate support for supporting the other side of the oil chamber cover plate is provided on the piston skirt.

[0014] Preferably, the inner cavity of the piston skirt is a through structure.

[0015] The present application has the following advantages over the prior art:

[0016] The friction welded all-steel piston of the present application changes the existing integral structure into a split structure of the piston head and the piston skirt, thereby improving the utilization rate of materials; at the same time, the split structure has good processing properties, which can reduce processing steps and tool rods, thereby improving efficiency and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the structure of a friction welded all-steel piston in an embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the oil chamber cover plate in the embodiment of the utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the piston head in the embodiment of the utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the piston skirt in the embodiment of the utility model;

[0022] Figure 5 It is a structural schematic diagram of the assembly of the piston head and the oil chamber cover plate in the embodiment of the utility model.

[0023] Reference numerals:

[0024] 1. Oil chamber cover; 2. Piston head; 3. Piston skirt; 4. Oil chamber; 5. Oil hole; 6. Slot; 7. Upper annular support; 8. Lower annular support; 9. Welding horn; 10. Cover support. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] like Figure 1-5 As shown, an embodiment of the utility model provides a friction welded all-steel piston, including an oil chamber cover plate 1, a piston head 2 and a piston skirt 3. The piston head 1 and the piston skirt 3 are split structures and are connected by welding, which improves material utilization. The oil chamber cover plate 1, the piston head 2 and the piston skirt 3 enclose a closed oil chamber 4, which makes the oil chamber 4 have greater molding freedom and better processability, and is suitable for mass production.

[0027] In this embodiment, the oil chamber cover plate 1 is an integral structure, the oil chamber cover plate 1 is an annular structure, and oil holes 5 are arranged on the oil chamber cover plate 1. The oil chamber cover plate 1 is improved from the existing two half-side type to an integral type, and is assembled before welding, which reduces the process difficulty.

[0028] In this embodiment, a slot 6 for fixing the oil chamber cover plate 1 is provided on the piston head 2. The oil chamber at the piston head 2 is an open structure. The oil chamber 4 at the piston head 2 is changed from the existing C-type semi-closed structure to an open structure, which has good processing properties, reduces processing steps and tool rods, and at the same time improves efficiency and reduces production costs.

[0029] In this embodiment, an upper annular support 7 is provided on the inner side of the piston head 2, and a lower annular support 8 is provided on the outer side of the piston skirt 3, and the upper annular support 7 is welded to the lower annular support 8. A welding horn 9 is formed at the welding connection between the upper annular support 7 and the lower annular support 8, and the lower side of the welding horn 9 abuts against one side of the oil chamber cover plate 1. A cover plate support 10 for abutting against the other side of the oil chamber cover plate 1 is provided on the piston skirt 3, thereby improving the reliability of the assembly of the oil chamber cover plate 1.

[0030] In this embodiment, the inner cavity of the piston skirt 3 is a through-type structure. The inner cavity of the piston skirt 3 is changed from the existing closed type to a through-type, which improves the manufacturing process and reduces the production cost.

[0031] In this embodiment, the finely processed oil chamber cover plate 1 is first inserted into the slot 6 of the semi-finished piston head 2, and then the piston head 2 is aligned with the semi-finished skirt 3 for friction welding, and then properly finely processed to form a piston. The piston is welded and formed, and the piston head 2 is partially provided with an inner cavity, which reduces the depth of the inner cavity of the piston skirt 3, improves the forging process of the piston skirt 3, and increases the life of the forging die.

[0032] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A friction welded all-steel piston, characterized in that: The oil chamber cover plate (1), the piston head (2) and the piston skirt (3) are of split structure and are connected by welding; the oil chamber cover plate (1), the piston head (2) and the piston skirt (3) enclose a closed oil chamber (4).

2. The friction welded all-steel piston according to claim 1, characterized in that: The oil chamber cover plate (1) is an integral structure.

3. The friction welded all-steel piston according to claim 2, characterized in that: The oil chamber cover plate (1) is an annular structure, and oil holes (5) are arranged on the oil chamber cover plate (1).

4. The friction welded all-steel piston according to claim 1, 2 or 3, characterized in that: The oil chamber (4) at the piston head (2) is an open structure.

5. The friction welded all-steel piston according to claim 1, 2 or 3, characterized in that: The piston head (2) is provided with a clamping groove (6) for fixing the oil chamber cover plate (1).

6. The friction welded all-steel piston according to claim 1, 2 or 3, characterized in that: An upper annular support (7) is provided on the inner side of the piston head (2), and a lower annular support (8) is provided on the outer side of the piston skirt (3). The upper annular support (7) and the lower annular support (8) are welded to each other.

7. The friction welded all-steel piston according to claim 6, characterized in that: A welding horn (9) is formed at the welding connection between the upper annular support (7) and the lower annular support (8), and the lower side of the welding horn (9) abuts against one side of the oil chamber cover plate (1).

8. The friction welded all-steel piston according to claim 7, characterized in that: The piston skirt (3) is provided with a cover plate support (10) for supporting the other side of the oil chamber cover plate (1).

9. The friction welded all-steel piston according to claim 1, 2 or 3, characterized in that: The inner cavity of the piston skirt (3) is a through structure.

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