Double-balance-shaft noise reduction device for two-cylinder diesel engine

Abstract

The utility model relates to double balance axle noise reduction technical field, and disclose two cylinder diesel engine double balance axle noise reduction device, including double balance axle ontology, the utility model's purpose lies in providing two cylinder diesel engine double balance axle noise reduction device, can improve its operation stability through damping mechanism, the mechanism passes through elastic buffer design, can effectively absorb the unbalanced vibration of double balance axle rotation because of eccentric mass or assembly error, avoid its and adjacent component rigid collision, eliminate the sharp noise produced from the source collision, simultaneously its built -in dynamic correction function can guide double balance axle gradually return to stable operation state, cooperate the oil supply of lubricating mechanism, can form oil film in the journal and bearing surface, convert dry friction into fluid lubrication, relatively reduce the friction coefficient, not only make rotation more smooth, can effectively restrain the low frequency hum noise caused by friction more, realize the double promotion of noise reduction and reliability.

Description

Technical Field

[0001] This utility model relates to the field of dual balance shaft noise reduction technology, specifically a dual balance shaft noise reduction device for a two-cylinder diesel engine. Background Technology

[0002] To effectively counteract the first and second order inertial forces generated by the reciprocating motion of the piston during engine operation, the dual balance shafts consist of one balance shaft rotating at the same speed as the crankshaft to eliminate first-order vibration, and the other rotating at twice the crankshaft speed to precisely suppress second-order vibration. The inertial forces generated by their opposite rotations and the vibration forces generated by the piston movement form a dynamic balance, thereby significantly reducing the overall vibration amplitude of the engine and improving operational stability. The use of noise reduction devices can greatly reduce the noise generated when using dual balance shafts in a two-cylinder diesel engine, and also reduces the instability of the dual balance shafts during rotation to a certain extent.

[0003] While the dual balance shaft technology used in two-cylinder diesel engines can suppress vibration, in actual use, the internal dual balance shafts will inevitably vibrate to some extent. This vibration will cause additional mechanical noise, becoming a prominent problem affecting the engine's static state. The industry often tries to reduce noise by increasing the number of balance shaft fixing points and strengthening the support structure. However, these methods often fail to achieve the desired results. Increasing the number of fixing points may cause local stress concentration, and structural optimization is limited by the overall engine layout, resulting in limited noise reduction effects. Utility Model Content

[0004] The purpose of this invention is to provide an alkyd resin paint stirring device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a noise reduction device for a two-cylinder diesel engine with dual balance shafts, including a dual balance shaft body. The inner cavity of the dual balance shaft body is provided with a plurality of lubrication mechanisms for providing lubrication. The inner cavity of the dual balance shaft body is provided with a plurality of damping mechanisms for reducing the vibration of the dual balance shafts. The surface of the damping mechanism is provided with a fixing block for linkage control of the vibration of the dual balance shafts. The inner wall of the fixing block is rotatably provided with a rotating shaft for fixing the dual balance shafts.

[0006] Preferably, the shock absorption mechanism includes a sleeve fixed to the inner cavity of the dual balance shaft body, a spring fixed inside the sleeve, and a spring rod fixed to the other end of the spring.

[0007] Preferably, the lubrication mechanism includes several pistons that slide on the inner wall of the dual balance shaft body, the inner cavity of the dual balance shaft body is provided with several oil storage chambers, one end of the sleeve is provided with a connecting channel, the inner cavity of the sleeve is provided with a hydraulic pipe, one end of the hydraulic pipe is connected to the inner wall of the sleeve, the other end is connected to the surface of the elastic rod, the surface of the elastic rod is provided with an oil delivery pipe, and the surface of the elastic rod is provided with several injection ports.

[0008] Preferably, the shock absorption mechanism is a uniform ring array, and the number of such arrays is three.

[0009] Preferably, the spring is a high-strength spring with a rigidity of 400N and a flexibility of 450N.

[0010] Preferably, the openings of the injection nozzles are arranged in a ring array and have six nozzles.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: The purpose of this invention is to provide a noise reduction device for a dual balance shaft of a two-cylinder diesel engine. The vibration damping mechanism can improve its operational stability. Through its elastic buffer design, the mechanism can effectively absorb the unbalanced vibration caused by eccentric mass or assembly error when the dual balance shaft rotates, avoiding rigid collisions with adjacent components and eliminating the sharp noise generated by the collisions at the source. At the same time, its built-in dynamic correction function can guide the dual balance shafts to gradually return to a stable operating state. With the oil supply of the lubrication mechanism, an oil film can be formed on the journal and bearing surface, converting dry friction into fluid lubrication and relatively reducing the coefficient of friction. This not only makes the rotation smoother but also effectively suppresses the low-frequency humming noise caused by friction, achieving a dual improvement in noise reduction and reliability. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional three-dimensional structural diagram of the present invention; Figure 3 This is a partial cross-sectional three-dimensional structural diagram of the present invention; Figure 4 This utility model Figure 3 Enlarged diagram of point A in the middle.

[0013] In the diagram: 1. Dual balance shaft body; 2. Lubrication mechanism; 21. Piston; 22. Oil reservoir; 23. Connecting channel; 24. Hydraulic pipe; 25. Oil delivery pipe; 26. Injection port; 3. Shock absorption mechanism; 31. Sleeve; 32. Spring; 33. Elastic rod; 4. Fixing block; 5. Rotating shaft. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-4As shown, the noise reduction device for a two-cylinder diesel engine with dual balance shafts includes a dual balance shaft body 1. The inner cavity of the dual balance shaft body 1 is equipped with several lubrication mechanisms 2, which provide lubrication to the entire device through slight vibration. The inner cavity of the dual balance shaft body 1 is also equipped with several damping mechanisms 3. These damping mechanisms 3 work together to control vibration. Fixed blocks 4 are mounted on the surface of each damping mechanism 3, and each fixed block 4 cooperates with a corresponding damping mechanism 3. A rotating shaft 5 rotates on the inner wall of each fixed block 4. The damping mechanisms 3 are arranged in a uniform ring array, with three in number. Regardless of the direction of the rotating shaft 5 due to vibration, three forces will control it, allowing it to achieve optimal stability with the fewest possible damping mechanisms 3. The system includes a sleeve 31 fixed inside the cavity of the dual balance shaft body 1. A spring 32 is fixed inside the sleeve 31. The spring 32 is a high-strength elastic spring with a rigidity of 400N and a flexibility of 450N. Sufficient force is required for the spring 32 to deform, ensuring that the rotation is not unstable during normal operation. A spring rod 33 is fixed to the other end of the spring 32, and the other end of the spring rod 33 is fixed to a fixed block 4. When the rotating shaft 5 vibrates slightly, the corresponding spring 32 compresses to resist the pressure generated by the vibration, while the other spring 32 generates a corresponding tension force acting on the fixed block 4. This push and pull action re-balances the rotating shaft 5 within the fixed block 4, preventing unauthorized movement of the rotating shaft 5. The lubrication mechanism 2 gradually recovers under pre-condition conditions, increasing its stability. It includes several pistons 21 sliding on the inner wall of the dual balance shaft body 1. The inner cavity of the dual balance shaft body 1 has several oil reservoirs 22. One end of the sleeve 31 has a connecting channel 23, which is unidirectional, allowing oil to enter the hydraulic pipe 24 only from the oil reservoir 22. The inner cavity of the sleeve 31 has a hydraulic pipe 24, one end of which is connected to the inner wall of the sleeve 31, and the other end is connected to the surface of the elastic rod 33. The surface of the elastic rod 33 has an oil delivery pipe 25 and several spray nozzles 26. The openings of the spray nozzles 26 are arranged in a ring array, with six nozzles to ensure even spraying and distribution during spraying. If the rotating shaft 5 experiences a slight vibration, this minute change will be transmitted to the damping mechanism 3. Once the damping mechanism 3 deforms under pressure, the elastic rod 33 retracts inward, causing the oil supply pipe 25 to compress the inner cavity of the hydraulic pipe 24, which is fixed at one end. The lubricating oil in the hydraulic pipe 24 is forced into the oil supply pipe 25, and then transported by the oil supply pipe 25 to the injection port 26, spraying the lubricating oil onto the surface of the rotating shaft 5 to reduce friction and thus reduce the vibration generated by the dual balance shafts. When the dual balance shafts resume rotation, the damping mechanism 3 expands again, and the lubricating oil in the oil reservoir 22 is pushed by pressure into the inner cavity of the hydraulic pipe 24, thus completing the replenishment of lubricating oil. Furthermore, lubricating oil can be injected into the oil reservoir 22 simply by pulling out the piston 21, which is simple and convenient.The fixed block 4 is linked to each shock-absorbing mechanism 3 and provides support for the rotating shaft 5.

[0016] Under the action of spring 32, when the oil supply pipe 25 is reset relative to the hydraulic pipe 24, the oil in the oil storage tank 22 can enter the hydraulic pipe 24.

[0017] Working principle: When the engine starts working, if the internal double balance shaft vibrates, its fixed block 4 will shift, which will drive the spring rod 33 to retract inward. Under the control of the spring 32, it will be corrected. The squeezed side will exert a pushing force, while the opposite side of the spring 32 will exert a pulling force to restore balance. To ensure smooth rotation, when vibration occurs, the internal hydraulic pipe 24 will be squeezed, and the lubricating oil stored in the hydraulic pipe 24 will be transported to the injection port 26 through the oil supply pipe 25. It will be evenly sprayed on the rotating connection between the fixed block 4 and the rotating shaft 5 to ensure smooth rotation and reduce the buzzing vibration caused by friction. After the vibration ends, the hydraulic pipe 24 will expand again to generate negative pressure, which will draw out the lubricating oil in the oil reservoir 22 and refill it into the hydraulic pipe 24. This process is repeated. To replenish the lubricating oil in the oil reservoir 22, simply open the piston 21 and inject the lubricating oil into the oil reservoir 22.

[0018] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0019] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A noise reduction device for a two-cylinder diesel engine with dual balance shafts, comprising a dual balance shaft body (1), characterized in that: The inner cavity of the dual balance shaft body (1) is provided with a number of lubrication mechanisms (2) for providing lubrication. The inner cavity of the dual balance shaft body (1) is provided with a number of damping mechanisms (3) for reducing the vibration of the dual balance shaft. The surface of the damping mechanism (3) is provided with a fixing block (4) for linkage control of the vibration of the dual balance shaft. The inner wall of the fixing block (4) is rotated with a rotating shaft (5) for fixing the dual balance shaft.

2. The noise reduction device for a two-cylinder diesel engine with dual balance shafts according to claim 1, characterized in that: The shock absorption mechanism (3) includes a sleeve (31) fixed to the inner cavity of the dual balance shaft body (1), a spring (32) is fixed inside the sleeve (31), and a spring rod (33) is fixed to the other end of the spring (32).

3. The noise reduction device for a two-cylinder diesel engine with dual balance shafts according to claim 2, characterized in that: The lubrication mechanism (2) includes several pistons (21) that slide on the inner wall of the double balance shaft body (1). The inner cavity of the double balance shaft body (1) is provided with several oil storage chambers (22). One end of the sleeve (31) is provided with a connecting channel (23). The inner cavity of the sleeve (31) is provided with a hydraulic pipe (24). One end of the hydraulic pipe (24) is connected to the inner wall of the sleeve (31), and the other end is connected to the surface of the elastic rod (33). The surface of the elastic rod (33) is provided with an oil delivery pipe (25), and the surface of the elastic rod (33) is provided with several injection ports (26).

4. The noise reduction device for a two-cylinder diesel engine with dual balance shafts according to claim 1, characterized in that: The shock absorption mechanism (3) is a uniform ring array, and there are three of them.

5. The noise reduction device for a two-cylinder diesel engine with dual balance shafts according to claim 2, characterized in that: The spring (32) is a high-strength spring with a rigidity of 400N and a flexible force of 450.

6. The noise reduction device for a two-cylinder diesel engine with dual balance shafts according to claim 3, characterized in that: The openings of the jet nozzle (26) are arranged in a ring array and have six nozzles.

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