Transmission structure of a marine engine

Abstract

This utility model belongs to the field of engine transmission technology, and more specifically relates to a transmission structure for a marine engine. The transmission structure includes a transmission chain, with tensioning guide rails and multiple tensioners connecting the tensioning guide rails on both sides. The multiple tensioners are respectively connected to different positions on the same side of the tensioning guide rails. A tensioning mechanism is provided in the middle of the transmission chain, connecting both tensioning guide rails simultaneously. The multiple tensioners connecting the tensioning guide rails provide tensioning forces at multiple angles and positions to the tensioning guide rails, thereby increasing the tension on the transmission chain and preventing insufficient tension in the transmission chain that could affect engine operation.

Description

Technical Field

[0001] This utility model belongs to the field of engine transmission technology, and more specifically relates to a transmission structure for a marine engine. Background Technology

[0002] Currently, traditional marine four-stroke engines, like automobile engines, have a valve train mechanism, which is driven by a chain. The structure is basically similar to that of automobile engines (e.g., publication number CN202370605U, titled "A Chain-Driven Valve Train Mechanism for Marine Engines"). The chain tensioner is usually connected to the lubricating oil line, and the chain tension is automatically adjusted by changes in oil pressure. However, marine engines are usually low-speed and output high torque. Therefore, a reducer needs to be installed between the engine and the lubricating oil pump to increase the speed of the oil pump and increase the oil supply pressure, so that the tensioner can provide higher tension.

[0003] The traditional method involves setting only one tensioner on one side of the drive chain. However, marine engines have high torque and long drive chain stroke, so the tension force provided by a single tensioner is limited. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides a transmission structure for a marine engine that can avoid insufficient tension in the transmission chain, which would affect the operation of the engine.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a transmission structure for a marine engine, including a transmission chain, with tensioning guide rails and multiple tensioners connected to the tensioning guide rails on both sides of the transmission chain, the multiple tensioners being connected to different positions on the same side of the tensioning guide rails respectively, and a tensioning mechanism being provided in the middle of the transmission chain, the tensioning mechanism being connected to two tensioning guide rails simultaneously.

[0006] Furthermore, the tensioning mechanism includes a telescopic device, on which two connecting rods are hinged to a piston rod, and the two connecting rods are respectively hinged to two tensioning guide rails.

[0007] Furthermore, the telescoping device has the same structure as the tensioner.

[0008] Furthermore, the multiple tensioners are connected together to a single oil supply pipeline.

[0009] Furthermore, the expansion joint and the tensioner are connected to the same oil supply pipe.

[0010] Compared with the prior art, the beneficial effects of this utility model are: by connecting multiple tensioners to the tensioning guide rail, multiple angles and positions of tension force are provided to the tensioning guide rail, thereby increasing the tension force on the transmission chain and avoiding insufficient tension in the transmission chain that would affect the operation of the engine. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the transmission structure of the marine engine of this utility model.

[0012] Reference numerals: 1. Drive chain; 2. Tensioning guide rail; 3. Tensioner; 4. Telescopic device; 5. Connecting rod. Detailed Implementation

[0013] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0014] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0015] Reference Figure 1 The present invention will be further described below.

[0016] A transmission structure for a marine engine includes a transmission chain 1. Tensioning guide rails 2 and multiple tensioners 3 connected to the tensioning guide rails 2 are provided on both sides of the transmission chain 1. The multiple tensioners 3 are respectively connected to different positions on the same side of the tensioning guide rails 2. A tensioning mechanism is provided in the middle of the transmission chain 1, and the tensioning mechanism is simultaneously connected to two tensioning guide rails 2. Figure 1 As shown, multiple tensioners 3 connected to the tensioning guide rail 2 provide tensioning force at multiple angles and positions to the tensioning guide rail 2, thereby increasing the tension on the transmission chain 1 and preventing insufficient tension in the transmission chain 1 from affecting the operation of the engine.

[0017] like Figure 1As shown, in this preferred embodiment, the tensioning mechanism includes a telescopic member 4. Two connecting rods 5 are hinged to the piston rod of the telescopic member 4, and the two connecting rods 5 are respectively hinged to two tensioning guide rails 2. Specifically, the extension and retraction of the piston rod on the telescopic member 4 drives the two connecting rods 5, which in turn drives the two tensioning guide rails 2, further providing additional tension force to the tensioning guide rails 2.

[0018] like Figure 1 As shown, in this example, preferably, the telescoping device 4 has the same structure as the tensioner 3. Specifically, when the lubricating oil pressure increases, the piston of the tensioner 3 extends, providing a greater tension force to the transmission chain 1. At the same time, the piston of the telescoping device 4 extends, pulling the two connecting rods 5, which can provide additional tension force.

[0019] like Figure 1 As shown, in this example, preferably, the multiple tensioners 3 are connected to a single oil supply pipeline to achieve synchronous operation of the tensioners 3.

[0020] like Figure 1 As shown, in this example, preferably, the expansion joint 4 and the tensioner 3 are connected to the same oil supply pipe to achieve synchronization between the expansion joint 4 and the tensioner 3.

[0021] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A transmission structure for a marine engine, comprising a transmission chain, characterized in that: Both sides of the transmission chain are provided with tensioning guide rails and multiple tensioners connected to the tensioning guide rails. The multiple tensioners are respectively connected to different positions on the same side of the tensioning guide rails. A tensioning mechanism is provided in the middle of the transmission chain, and the tensioning mechanism is connected to two tensioning guide rails at the same time.

2. The transmission structure of the marine engine according to claim 1, characterized in that: The tensioning mechanism includes a telescopic device, on which two connecting rods are hinged to a piston rod, and the two connecting rods are respectively hinged to two tensioning guide rails.

3. The transmission structure of the marine engine according to claim 2, characterized in that: The expansion joint has the same structure as the tensioner.

4. The transmission structure of the marine engine according to claim 1, characterized in that: The multiple tensioners are connected to a single oil supply pipeline.

5. The transmission structure of the marine engine according to claim 3, characterized in that: The expansion joint and the tensioner are connected to the same oil supply pipeline.

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