Piston connecting rod mechanism

Abstract

A piston connecting rod mechanism comprises a piston and a connecting rod which are arranged up and down. The connecting rod comprises a vertically-arranged rod body, the upper side of the rod body is in rigid connection with the piston, a connecting rod big head is arranged on the lower side of the rod body and comprises a big head body and a connecting rod cover, the big head body comprises an upper transverse plate, and first extending parts extending downwards are arranged on the left side and the right side of the upper transverse plate respectively. Second extending parts extending upwards are arranged on the left side and the right side of the lower transverse plate respectively, and after the two second extending parts and the two first extending parts are correspondingly matched in an abutting mode, a transversely-arranged long-strip-shaped through hole is formed between the large head body and the connecting rod cover. The upper side of the connecting rod is directly and fixedly connected with the piston, the large end of the connecting rod is elongated, and the piston and the connecting rod integrally linearly move along the axial direction of the cylinder barrel during acting, so that heat efficiency of the engine can be improved, and operation vibration and noise of the engine can be effectively reduced due to the fact that the connecting rod has no oblique impact force on a crankshaft.

Description

Technical Field

[0001] This invention relates to a piston-connecting rod mechanism. Background Technology

[0002] Pistons and connecting rods are important components of an engine. The piston is placed in the cylinder, and its lower side is connected to the small end of the connecting rod via a piston pin and a retaining ring. After connection, the small end of the connecting rod can swing around the piston pin. The other end of the connecting rod is the large end of the piston, which is connected to the connecting rod journal on the crankshaft. During the power stroke, the piston transmits power to the crankshaft through the connecting rod, thereby driving the crankshaft to rotate. For the specific structure of the piston and connecting rod, please refer to Chinese Patent CN204327225U. The problem with the existing technology is that, because the piston and connecting rod are connected by a piston pin, and the small end of the connecting rod can swing around the piston pin, combined with the structural characteristics of the crankshaft, the force transmitted by the piston to the crankshaft is transmitted obliquely through the connecting rod. Moreover, the connecting rod exerts a useless impact force on the connecting rod journal of the crankshaft, causing the engine to vibrate and generate noise. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a piston connecting rod mechanism in which the upper side of the connecting rod is directly fixedly connected to the piston, and the big end of the connecting rod is long and narrow. When power is applied, the piston and connecting rod move only in a straight line along the cylinder axis. This not only improves the thermal efficiency of the engine, but also effectively reduces the engine's vibration and noise because the connecting rod does not exert any oblique impact force on the crankshaft.

[0004] To solve the above-mentioned technical problems, the present invention provides a piston-connecting rod mechanism, including a piston and a connecting rod arranged vertically;

[0005] The connecting rod includes a vertically arranged rod body, the upper side of which is rigidly connected to the piston, and a connecting rod big end on the lower side of the rod body. The connecting rod big end includes a big end body and a connecting rod cap arranged vertically and connected by connecting rod bolts. The big end body includes an upper horizontal plate arranged horizontally with its length direction running left and right. The upper horizontal plate has a first extension extending downward on its left and right sides respectively. The connecting rod cap includes a lower horizontal plate arranged horizontally with its length direction running left and right. The lower horizontal plate has a second extension extending upward on its left and right sides respectively. After the two second extensions and the two first extensions abut against each other, a transversely arranged elongated through hole is formed between the big end body and the connecting rod cap.

[0006] For the sake of simplicity, the piston connecting rod structure described in this invention will be referred to as "this structure" in the following text.

[0007] The operation of this structure is as follows: the piston moves axially within the cylinder, and when the crankshaft rotates, the connecting rod journal of the crankshaft slides laterally in the oval through hole.

[0008] Advantages of this structure: In this structure, the upper end of the connecting rod is directly and rigidly connected to the piston. The big end of the connecting rod is long and narrow. During power operation, the piston and connecting rod move only in a straight line along the cylinder axis. The connecting rod does not exert any oblique impact force on the crankshaft, which can effectively reduce engine vibration and noise. The force exerted by the connecting rod on the connecting rod journal of the crankshaft always remains vertical, which is beneficial to improving engine thermal efficiency. Moreover, since the connecting rod does not have a small end, the piston structure can be simplified and the machining is more convenient. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure.

[0010] Figure 2 This is a schematic diagram of the assembly state of the connecting rod journal of this structure and the crankshaft.

[0011] Figure 3 This is a step-by-step schematic diagram of the operation of this structure (one revolution of the crankshaft). Detailed Implementation

[0012] This embodiment uses an inline cylinder as an example. Other types of cylinders, such as V-type cylinders and horizontally opposed cylinders, are no different in principle.

[0013] See Figures 1-3 A piston-connecting rod mechanism includes a piston 1 and a connecting rod 2 arranged vertically.

[0014] The piston 1 is a vertically arranged cylinder, and the upper part of the piston 1 is provided with three annular grooves 11 arranged vertically and horizontally.

[0015] The connecting rod 2 includes a vertically arranged rod body 21. A connecting rod big end is provided on the lower side of the rod body 21. The connecting rod big end includes a big end body 22 and a connecting rod cover 23 arranged vertically and connected by connecting rod bolts 24. The big end body 22 includes an upper horizontal plate 221 arranged horizontally and running left and right along its length. The upper horizontal plate 221 has arc-shaped first extensions 222 extending downward on its left and right sides respectively. The connecting rod cover 23 includes a lower horizontal plate 231 arranged horizontally and running left and right along its length. The lower horizontal plate 231 has arc-shaped second extensions 232 extending upward on its left and right sides respectively (in this embodiment, the first extensions 222 and the second extensions 232 are arc-shaped). After the two second extensions 232 and the two first extensions 222 are correspondingly abutted and engaged, a horizontally arranged oval through hole 25 is formed between the big end body 22 and the connecting rod cover 23.

[0016] The operation of this structure is as follows: the piston 1 moves along the cylinder axial direction inside the cylinder. When the crankshaft rotates, the connecting rod journal 3 of the crankshaft slides laterally in the oval through hole 25 (in actual operation, when the connecting rod journal 3 of the crankshaft moves to the leftmost or rightmost end, it will not contact the left and right sides of the connecting rod big end).

[0017] See details Figure 3 , Figure 3 In diagram A, the piston is at its lowest point. The connecting rod journal 3 of the crankshaft is located in the middle of the oblong hole 25. Starting from this point, the crankshaft rotates 90° counterclockwise from A to B, and the piston 1 rises to the middle position. The connecting rod journal 3 of the crankshaft is located on the right side of the oblong hole 25. From B to C, the crankshaft rotates 90° counterclockwise again, and the piston 1 rises to the highest point. The connecting rod journal 3 of the crankshaft is located in the middle of the oblong hole 25. From C to D, the crankshaft continues to rotate 90° counterclockwise, and the piston 1 falls to the middle position. The connecting rod journal 3 of the crankshaft is located on the left side of the oblong hole 25. From D to E, the crankshaft rotates 90° counterclockwise again, and the piston 1 continues to fall to the lowest point. The connecting rod journal 3 of the crankshaft is located in the middle of the oblong hole 25, returning to the initial position. The crankshaft has rotated a total of 360°.

[0018] Advantages of this structure: In this structure, the upper end of the connecting rod is directly and rigidly connected to the piston. The big end of the connecting rod is long and narrow. When power is applied, the piston and connecting rod move only in a straight line along the cylinder axis. The force exerted by the connecting rod on the connecting rod journal of the crankshaft always remains vertical, which helps to improve the thermal efficiency of the engine. The connecting rod does not exert any oblique impact force on the crankshaft, which can effectively reduce the engine's operating vibration and noise. Moreover, since the connecting rod does not have a small end, the piston structure can be simplified and the machining is more convenient.

Claims

1. A piston connecting rod mechanism characterized by: The piston and the connecting rod are arranged vertically. The connecting rod comprises a vertically arranged rod body, the upper side of the rod body is rigidly connected with the piston, and the lower side of the rod body is provided with a connecting rod big head, the connecting rod big head comprises an upper big head body and a connecting rod cover which are arranged vertically and connected through a connecting rod bolt, the upper big head body comprises a horizontally arranged upper transverse plate with the length direction being left-right, the left and right sides of the upper transverse plate are respectively provided with downward extending first extension parts, the connecting rod cover comprises a horizontally arranged lower transverse plate with the length direction being left-right, the left and right sides of the lower transverse plate are respectively provided with upward extending second extension parts, after the two second extension parts are correspondingly abutted and matched with the two first extension parts, a horizontally arranged long strip-shaped through hole is formed between the upper big head body and the connecting rod cover.

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