A chain drive structure for a diesel engine

Abstract

This utility model discloses a chain drive structure for a diesel engine, including a drive chain located inside the engine housing and a first guide rail pair and a second guide rail pair located on both sides of the drive chain. The first guide rail pair is rotatably connected to the engine housing. A first tensioner is provided at the free end of the first guide rail pair. The first tensioner is connected to the lubricating oil pump in the engine system through a pipe. A slider is slidably connected to both the first and second guide rail pairs. A tensioning sprocket is rotatably connected to the slider. The tensioning sprocket cooperates with the drive chain. A second tensioner is connected to the slider. The second tensioner is located on the first and second guide rail pairs. The second tensioner is connected to the lubricating oil pump through a pipe, and a solenoid valve is provided on the pipe. The tensioning sprocket applies additional tension to the drive chain to ensure tension on the drive chain, extend its service life, reduce replacement frequency, and reduce replacement costs.

Description

Technical Field

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

[0002] Diesel engines are more powerful, so the drive chain in its chain drive system needs to withstand greater driving force and is more prone to stretching and loosening. Traditional tensioners and guide rails have limited travel. When the chain elongation exceeds the maximum tension that the tensioning mechanism can achieve, the chain vibration frequency will increase significantly, resulting in greater engine noise and increased fuel consumption, which seriously affects the normal operation of the engine.

[0003] The current solution is to disassemble the chain and replace it with a new one. However, for semi-trailers that frequently haul cargo and operate under complex and harsh conditions, the chain lifespan is shorter, and the chain replacement frequency increases. It may need to be replaced eight to ten times or even more during the engine's lifespan, increasing replacement costs. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a chain drive structure for a diesel engine, in which a tension sprocket is provided on the guide rail pair. The tension sprocket applies additional tension to the drive chain when necessary, thereby ensuring the tension on the drive chain, extending its service life, reducing the number of replacements, and lowering replacement costs.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a chain drive structure for a diesel engine, comprising a drive chain located within the engine housing and a first guide rail pair and a second guide rail pair located on both sides of the drive chain. The first guide rail pair is rotatably connected to the engine housing. A first tensioner is provided at the free end of the first guide rail pair. The first tensioner is connected to a lubricating oil pump in the engine system via a pipe. A slider is slidably connected to both the first and second guide rail pairs. A tensioning sprocket is rotatably connected to the slider. The tensioning sprocket cooperates with the drive chain. A second tensioner is connected to the slider. The second tensioner is located on the first and second guide rail pairs. The second tensioner is connected to the lubricating oil pump via a pipe, and a solenoid valve is provided on the pipe.

[0006] Furthermore, a sensing plate is provided on the rotating end of the first guide rail pair, and a corresponding sensing switch is provided on one side of the rotating end. The sensing switch is electrically connected to the solenoid valve.

[0007] Furthermore, the first guide rail pair and the second guide rail pair are provided with sliding grooves, the slider is slidably connected in the sliding grooves, both sides of the sliding grooves are provided with guide grooves, and the slider is provided with guide rails corresponding to the guide grooves.

[0008] Furthermore, the slider is provided with a U-shaped lubrication cavity, the tensioning sprocket rotates at the opening of the lubrication cavity, and a through hole is provided on the end face of the slider that contacts the piston rod of the tensioner, the through hole connecting to the lubrication cavity.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: when the elongation of the transmission chain is greater than the maximum tension that the first guide rail pair can achieve, the solenoid valve is opened, allowing the second tensioners on the first and second guide rail pairs to be connected to the lubricating oil pump through pipes. The lubricating oil pump supplies oil to the two second tensioners, causing the second tensioners to drive the sliders to move toward the transmission chain. This allows additional tension to be applied to the transmission chain through the tensioning sprocket, ensuring the tension on the transmission chain, extending its service life, reducing the number of replacements, and lowering replacement costs. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the chain drive structure of the diesel engine of this utility model;

[0011] Figure 2 This is a schematic diagram of the first guide rail pair in the chain drive structure of the diesel engine of this utility model;

[0012] Figure 3 This is a front view of the slider in the chain drive structure of the diesel engine of this utility model.

[0013] Reference numerals: 1. Transmission chain; 2. First guide rail pair; 3. Second guide rail pair; 4. First tensioner; 5. Lubricating oil pump; 6. Slider; 7. Tensioning sprocket; 8. Second tensioner; 9. Pipe; 10. Solenoid valve; 11. Induction plate; 12. Induction switch; 13. Guide rail; 14. Lubrication chamber; 15. Through hole; 16. Pipe; 17. Support plate. Detailed Implementation

[0014] 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.

[0015] 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.

[0016] Reference Figures 1 to 3 The present invention will be further described below.

[0017] A chain drive structure for a diesel engine includes a drive chain 1 located within an engine housing (not shown in the attached drawings) and a first guide rail pair 2 and a second guide rail pair 3 located on both sides of the drive chain 1. The first guide rail pair 2 is rotatably connected to the engine housing. A first tensioner 4 is provided at the free end of the first guide rail pair 2. The first tensioner 4 is connected to a lubricating oil pump 5 in the engine system via a pipe 9. A slider 6 is slidably connected to both the first guide rail pair 2 and the second guide rail pair 3. A tensioning sprocket 7 is rotatably connected to the slider 6. The tensioning sprocket 7 cooperates with the drive chain 1. A second tensioner 8 is connected to the slider 6. The second tensioner 8 is located on the first guide rail pair 2 and the second guide rail pair 3. The second tensioner 8 is connected to the lubricating oil pump 5 via a pipe 9, and a solenoid valve 10 is provided on the pipe 9.

[0018] like Figures 1 to 3 As shown, when the transmission chain 1 is in normal operation, it is tensioned through the first guide rail pair 2 and the second guide rail pair 3. The tensioning sprockets 7 on the two sliders 6 are in normal cooperation with the transmission chain 1. The sliders 6 are located at the furthest point from the transmission chain 1 on the guide rail pair, and the solenoid valve 10 is in the closed state. At this time, the tension of the transmission chain 1 is adjusted only through the first guide rail pair 2 and the first tensioner 4. When the elongation of the transmission chain 1 is greater than the maximum tension that the first guide rail pair 2 can provide, the solenoid valve 10 is opened, so that the second tensioners 8 on the first guide rail pair 2 and the second guide rail pair 3 are connected to the lubricating oil pump 5 through the pipe 9. The lubricating oil pump 5 supplies oil to the two second tensioners 8, so that the second tensioners 8 drive the sliders 6 to move toward the transmission chain 1. This allows the tensioning sprockets 7 to apply additional tension to the transmission chain 1, thereby ensuring the tension on the transmission chain 1, extending its service life, reducing the number of replacements, and lowering replacement costs.

[0019] Specifically, the first tensioner 4 and the second tensioner 8 have the same structure and are existing technologies, such as existing published patent technologies with publication numbers CN204459030U, CN202418449U, CN217558918U, etc.

[0020] like Figure 1 As shown, specifically, the first guide rail pair 2 and the second guide rail pair 3 are provided with support plates 17, and the second tensioner 8 is connected to the support plates 17 by bolts.

[0021] like Figure 1 As shown, in this preferred embodiment, a sensing plate 11 is provided on the rotating end of the first guide rail pair 2, and a corresponding sensing switch 12 is provided on one side of the rotating end. The sensing switch 12 is electrically connected to the solenoid valve 10 (see attached diagram). Figure 1 (middle dashed line).

[0022] Specifically, when the first guide rail pair 2 is tensioned normally, its sensing plate 11 will not contact the sensing switch 12, and the sensing switch 12 will not send a signal to the solenoid valve 10. When the sensing switch 12 senses the sensing plate 11, it means that the rotation of the first guide rail pair 2 is too large, the elongation of the transmission chain 1 is large, and the tension is reduced. Then the sensing switch 12 sends a signal to the solenoid valve 10 to open the solenoid valve 10, so that the lubricating oil pump 5 can supply oil to the second tensioner 8 connecting the two sliders 6, thereby pushing the sliders 6 out to provide additional tension to the transmission chain 1.

[0023] like Figure 2 and Figure 3 As shown in the preferred embodiment, the first guide rail pair 2 and the second guide rail pair 3 are provided with sliding grooves, the slider 6 is slidably connected in the sliding grooves, and guide grooves are provided on both sides of the sliding grooves. The slider 6 is provided with guide rails 13 corresponding to the guide grooves to ensure the stability of the slider 6 sliding.

[0024] like Figure 2 As shown, in this preferred embodiment, the slider 6 is provided with a U-shaped lubrication cavity 14, the tensioning sprocket 7 rotates at the opening of the lubrication cavity 14, and a through hole 15 is provided on the end face of the slider 6 that contacts the piston rod of the tensioner 8, the through hole 15 connecting to the lubrication cavity 14.

[0025] Specifically, the piston rod of the second tensioner 8 is provided with an oil drain hole, which can spray excess lubricating oil onto the tension sprocket 7 when draining oil, thereby lubricating the tension sprocket 7.

[0026] 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 chain drive structure of a diesel engine, comprising a drive chain located in an engine housing and a first guide rail pair and a second guide rail pair located on both sides of the drive chain, the first guide rail pair being rotationally connected with the engine housing, a first tensioner being provided at a free end of the first guide rail pair, the first tensioner being connected with a lubricating oil pump in an engine system through a pipeline, characterized in that: A slider is slidably connected to both the first and second guide rail pairs. A tension sprocket is rotatably connected to the slider. The tension sprocket cooperates with the transmission chain. A second tensioner is connected to the slider. The second tensioner is located on the first and second guide rail pairs. The second tensioner is connected to a lubricating oil pump through a pipe, and a solenoid valve is installed on the pipe.

2. The chain drive structure of the diesel engine according to claim 1, characterized in that: A sensing plate is provided on the rotating end of the first guide rail pair, and a corresponding sensing switch is provided on one side of the rotating end. The sensing switch is electrically connected to the solenoid valve.

3. The chain drive structure of the diesel engine according to claim 1, characterized in that: The first guide rail pair and the second guide rail pair are provided with sliding grooves, the slider is slidably connected in the sliding grooves, and guide grooves are provided on both sides of the sliding grooves. The slider is provided with guide rails corresponding to the guide grooves.

4. The chain drive structure of the diesel engine according to claim 1, characterized in that: The slider is provided with a U-shaped lubrication cavity, the tensioning sprocket rotates at the opening of the lubrication cavity, and a through hole is provided on the end face of the slider that contacts the piston rod of the tensioner, the through hole connecting to the lubrication cavity.

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