Damping Gear and Gear Train

Abstract

The present application provides a damping gear and a gear train. The damping gear includes: a rotor including a gear portion and a rotating portion, the gear portion being configured to mesh with a target gear, the rotating portion being connected to the gear portion, the gear portion being configured to drive the rotating portion to rotate, and the target gear being a gear that exhibits negative torque during operation; and a stator, wherein the stator and the rotor form a sealed cavity, the rotating portion is located in the sealed cavity, and a damping fluid is contained in the sealed cavity. By using the damping gear instead of the shear gear, it is only necessary to ensure that the damping torque of the damping gear is greater than or equal to the maximum negative torque of the target gear to eliminate the negative torque, and there will be no gear knocking noise. The damping torque is easy to control and has high stability, solving the problem of poor stability of the shear gear used in the prior art to reduce gear knocking noise.

Description

Technical Field

[0001] The present application relates to the technical field of gear noise reduction, and more particularly, to a damping gear and a gear train. Background Art

[0002] With the development of the times and the progress of technology, people have put forward higher and higher requirements for comfort. In the field of commercial vehicles, low-noise engines are becoming more and more popular among customers. According to research, about 60% of the engine noise comes from the gear train, that is, gear knocking noise. The gear arrangement of the engine gear train is relatively complex. The fuel injection pump, air compressor, and camshaft are all driven by the crankshaft gear. Coupled with the intermediate transmission gears, the branches and the number of gears in the gear train are relatively large. The long gear chain and gear machining errors will lead to large transmission errors, causing relatively strong gear knocking noise.

[0003] Currently, in general, shear gears are used to reduce the knocking noise of the gear train. The structure of the shear gear is as Figure 1 shown. The shear gear adopts the structure of a main gear 01 and a sub-gear 02. The stop pin 03 is used to press the spring or rubber for fixed installation. After the stop pin 03 is pulled out, the main and sub-gears are staggered relative to each other due to the relative action of the spring or rubber. In the gear meshing, the relatively staggered main and sub-gears can compensate for the gear backlash in the meshing of two pairs of gears, thereby achieving zero clearance and reducing the gear knocking noise.

[0004] However, the shear gear has the following disadvantages:

[0005] 1) The shearing amount of the shear teeth needs to be determined according to the actual tooth side clearance. If the shearing amount is too small, it cannot completely eliminate the gear clearance; if the shearing amount is too large, it is difficult to install and will cause gear howling. Therefore, a single shearing amount is not applicable to all engines.

[0006] 2) The shear teeth can only act on the two gears in contact with the shear teeth, and cannot eliminate the transmission of gear fluctuations actively on the gear chain, and cannot eliminate the gear knocking noise on the entire gear chain.

[0007] 3) Currently, the production manufacturers have poor control over the consistency of the shearing amount of the shear teeth, and the yield rate is relatively low.

[0008] 4) The shear gear has poor reliability. After long-term operation, the shearing amount will become smaller or the rubber will be fatigued and damaged, resulting in the loss of the noise reduction function. Summary of the Invention

[0009] The main purpose of the present application is to provide a damping gear and a gear train to solve the problem of poor stability of the shear gear used to reduce the gear knocking noise in the prior art.

[0010] To achieve the above object, according to one aspect of the present application, a damping gear is provided, including: a rotor, including a gear portion and a rotating portion, the gear portion is used to mesh with a target gear, the rotating portion is connected to the gear portion, the gear portion is used to drive the rotating portion to rotate, and the target gear is a gear that generates negative torque during operation; a stator and the rotor form a sealed cavity, the rotating portion is located in the sealed cavity, and the sealed cavity is filled with damping fluid.

[0011] Optionally, the damping gear further includes: a mass block, located in the sealed cavity, such that an isolation cavity is formed between the mass block and the annular edge of the sealed cavity, the isolation cavity is not connected to the remaining sealed cavity, and the remaining sealed cavity is filled with damping fluid, and the annular edge is the edge of the rotor that is radially away from the rotation center of the rotor; an elastic member, located in the isolation cavity, and the elastic member is in contact with the mass block.

[0012] Optionally, the target gear meshes with the damping gear and a first intermediate gear respectively, and the first intermediate gear is the transmission gear closest to the target gear in the gear train including the target gear.

[0013] Optionally, the damping gear meshes with the target gear and a second intermediate gear respectively to replace the first intermediate gear, the first intermediate gear is the transmission gear closest to the target gear in the gear train including the target gear, and the second intermediate gear is the transmission gear closest to the first intermediate gear in the gear train including the target gear.

[0014] Optionally, the rotating portion is a rotor annular tooth, the stator includes a stator annular tooth, both the stator annular tooth and the rotor annular tooth are located in the sealed cavity, and the axes of the rotor annular tooth and the stator annular tooth are parallel and spaced apart by a predetermined distance.

[0015] Optionally, there are multiple rotor annular teeth and stator annular teeth, and they correspond to each other one by one.

[0016] Optionally, the target gear includes a fuel injection pump gear, an air compressor gear, and a camshaft gear.

[0017] Optionally, the damping torque of the damping gear is greater than or equal to 0.8 times the maximum negative torque of the target gear.

[0018] Optionally, the damping fluid is silicone oil.

[0019] Optionally, there are multiple types of damping fluids, and the viscosities of different types of damping fluids are different.

[0020] According to another aspect of the present application, a gear train is provided, including a damping gear and a target gear. The damping gear meshes with the target gear, and the target gear is a gear that generates negative torque during the working process. The damping gear is any one of the damping gears described above.

[0021] Applying the technical solution of the present application, in the above damping gear, the stator and the rotor form a sealed cavity, and a damping liquid is contained in the sealed cavity, so that the damping liquid hinders the rotation of the rotor, thereby providing a damping torque to the meshing target gear through the gear part to offset the negative torque of the target gear, so as to avoid the occurrence of gear knocking noise and achieve noise reduction. Since the shear gear in the prior art realizes zero-clearance transmission through a certain shear amount to reduce noise, but the consistency control of the shear amount is poor, resulting in unstable noise reduction effect. Using a damping gear instead of a shear gear, only ensuring that the damping torque of the damping gear is greater than or equal to the maximum negative torque of the target gear can eliminate the negative torque, and there will be no gear knocking noise. The damping torque is easy to control and has high stability, solving the problem of poor stability of the shear gear used to reduce gear knocking noise in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings forming a part of this application are used to provide a further understanding of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0023] Figure 1 A schematic diagram of a shear gear in the prior art is shown;

[0024] Figure 2 An external schematic diagram of a damping gear according to an embodiment of the present application is shown;

[0025] Figure 3 A cross-sectional view of a damping gear according to an embodiment of the present application is shown;

[0026] Figure 4 A torque change curve diagram according to an embodiment of the present application is shown;

[0027] Figure 5 A schematic diagram of a fuel injection pump gear and an intermediate gear according to an embodiment of the present application is shown;

[0028] Figure 6 A schematic diagram of a gear train applying a damping gear according to an embodiment of the present application is shown;

[0029] Figure 7 A schematic diagram of a gear train applying a damping gear according to another embodiment of the present application is shown;

[0030] Figure 8Shows a schematic diagram of the rotor annular teeth according to an embodiment of the present application;

[0031] Figure 9 Shows a schematic diagram of the stator annular teeth according to an embodiment of the present application;

[0032] Figure 10 (a) and Figure 10 (b) respectively show the front view and cross-sectional view of the damping gear according to another embodiment of the present application.

[0033] Among them, the above-mentioned drawings include the following reference numerals:

[0034] 01, main gear; 02, sub-gear; 03, thrust pin; 10, rotor; 11, gear part; 12, rotating part; 20, stator; 21, sealing cavity; 22, sealing ring; 23, stator annular teeth; 30, thrust washer; 40, bolt hole; 50, mass block; 60, elastic member. Detailed implementation manners

[0035] It should be noted that the following detailed description is illustrative and is intended to provide further description of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0036] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary implementation manners according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0037] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element can be directly on the other element, or there can also be an intermediate element. Moreover, in the specification and claims, when an element is described as "connected" to another element, the element can be "directly connected" to the other element, or "connected" to the other element through a third element.

[0038] For the convenience of description, some nouns or terms related to the embodiments of the present application are described below:

[0039] Fuel injection pump: A component in a diesel engine that pressurizes fuel and is driven by a crankshaft gear through an intermediate gear.

[0040] As introduced in the background art, the stability of the shear gears used to reduce gear knocking noise in the prior art is poor. To solve the above problems, the present application proposes a damping gear and a gear train.

[0041] According to an embodiment of the present application, there is provided a damping gear, as Figure 2 and Figure 3 shown, the damping gear includes:

[0042] A rotor 10, including a gear portion 11 and a rotating portion 12. The gear portion 11 is used to mesh with a target gear. The rotating portion is connected to the gear portion. The gear portion is used to drive the rotating portion to rotate. The target gear is a gear that generates negative torque during the working process;

[0043] A stator 20. The stator 20 and the rotor 10 form a sealed cavity 21. The rotating portion 12 is located in the sealed cavity 21, and a damping liquid is contained in the sealed cavity 21.

[0044] In the above damping gear, the stator and the rotor form a sealed cavity, and a damping liquid is contained in the sealed cavity, so that the damping liquid hinders the rotation of the rotor, thereby providing a damping torque to the meshing target gear through the gear portion to offset the negative torque of the target gear, so as to avoid the occurrence of gear knocking noise and achieve noise reduction. Since the shear gears in the prior art achieve zero-clearance transmission through a certain shear amount to reduce noise, but the consistency control of the shear amount is poor, resulting in unstable noise reduction effect. By using a damping gear instead of a shear gear, only ensuring that the damping torque of the damping gear is greater than or equal to the maximum negative torque of the target gear can eliminate the negative torque, and there will be no gear knocking noise. The damping torque is easy to control and has high stability, solving the problem of poor stability of the shear gears used to reduce gear knocking noise in the prior art.

[0045] It should be noted that, as Figure 3 shown, the above damping gear further includes a thrust washer 30 and bolt holes 40. The thrust washer prevents the axial movement of the gear. The bolt holes 40 can fix the stator through bolts. The sealed cavity 21 is sealed by a sealing ring 22 to enhance the sealing performance and prevent the leakage of the damping liquid.

[0046] In addition, the reasons for the occurrence of gear knocking noise are as follows: Taking the fuel injection pump gear as an example, one of the main components affecting the gear knocking noise is the fuel injection pump. Because the plunger-type fuel injection pump will generate negative torque when the plunger moves downward, and the torque change curve is as Figure 4 shown, the circled part is the negative torque. During the working process, as Figure 5As shown, at the moment when the driving torque of the fuel injection pump is positive, the intermediate gear drives the fuel injection pump gear, and the tooth surfaces of tooth A and tooth B are in contact. Due to the side clearance, the tooth surfaces of tooth B and tooth C are not in contact with each other. At the moment when the driving torque is negative, the fuel injection pump gear drives the intermediate gear in reverse, the tooth surfaces of tooth A and tooth B are separated, and the tooth surfaces of tooth B and tooth C are in contact. Moreover, the rotational speed fluctuation of this gear will be transmitted forward by the intermediate gear, causing the gears of the entire transmission chain to knock against each other, resulting in strong knocking noise.

[0047] Since noise reduction can be achieved by meshing the damping gear with the target gear, but there are various installation methods in the gear train. For example, in an optional embodiment, the above-mentioned target gear meshes with the above-mentioned damping gear and the first intermediate gear respectively, and the first intermediate gear is the transmission gear closest to the target gear in the gear train including the target gear.

[0048] In the above embodiment, as Figure 6 shown, taking the fuel injection pump gear as an example of the above-mentioned target gear, the fuel injection pump gear is located at the end of the gear chain. The two intermediate gears close to the fuel injection pump gear in the gear train are intermediate gear 1 and intermediate gear 2, that is, the first intermediate gear and the second intermediate gear. A damping gear is added after the fuel injection pump gear on the basis of the original gear train, and the number of gears in the gear train increases. The damping torque directly cancels the negative torque of the fuel injection pump, and no sudden change in rotational speed occurs in the fuel injection pump gear, that is, the problem of gear knocking on the entire drive chain is solved.

[0049] For another example, in another optional embodiment, the above-mentioned damping gear meshes with the above-mentioned target gear and the second intermediate gear respectively to replace the first intermediate gear. The first intermediate gear is the transmission gear closest to the target gear in the gear train including the target gear, and the second intermediate gear is the transmission gear closest to the first intermediate gear in the gear train including the target gear.

[0050] In the above embodiment, as Figure 7 shown, the intermediate gear 1 in the original gear train is replaced by a damping gear in the gear train, and the number of gears in the gear train does not change. The damping torque cannot act on the negative torque of the fuel injection pump, and there is still a sudden change in rotational speed in the fuel injection pump gear. Gear knocking noise still occurs between the fuel injection gear and the damping gear, but the damping torque eliminates the transmission of the rotational speed fluctuation of the fuel injection pump gear to the intermediate gear 1, that is, the gear knocking noise of the remaining gears in the entire drive chain except the fuel injection pump gear and the damping gear is solved.

[0051] The structures of the above-mentioned rotating part and the above-mentioned sealing part are not limited, and any feasible structure belongs to the protection scope of the present application. For example, in an optional embodiment, as Figure 8 shown, the above-mentioned rotating part 12 is a rotor ring gear, as Figure 9As shown, the above-mentioned stator 20 further includes a stator annular tooth 23. Both the stator annular tooth and the rotor annular tooth are located in the above-mentioned sealed cavity, and the axes of the rotor annular tooth and the stator annular tooth are parallel and spaced apart by a predetermined distance.

[0052] In the above embodiment, the axes of the rotor annular tooth and the stator annular tooth are parallel and spaced apart by a predetermined distance. The space between the stator annular tooth and the rotor annular tooth is filled with high-viscosity silicone oil. When the gear rotates, the rotor rotates with the gear, the stator is fixed to the machine body and remains stationary. There is a relative rotational displacement between the annular teeth of the rotor and the annular teeth of the stator. The high-viscosity silicone oil in the silicone oil cavity will generate a certain torque, that is, a damping torque, due to the shear force caused by the relative displacement, so as to improve the noise reduction effect through the damping torque.

[0053] Further, in order to further increase the damping torque, in an optional embodiment, both the rotor annular tooth and the stator annular tooth have a plurality of teeth and correspond to each other one by one.

[0054] In the above embodiment, both the rotor annular tooth and the stator annular tooth have a plurality of teeth, and are arranged at intervals in sequence, so that each rotor annular tooth corresponds to a stator annular tooth, thereby providing a plurality of damping torques, greatly increasing the damping torque, and further improving the noise reduction effect.

[0055] In an optional embodiment, as Figure 10 (a) and Figure 10 (b) shown, the above-mentioned damping gear further includes: a mass block 50, located in the above-mentioned sealed cavity, such that an isolation cavity is formed between the mass block 50 and the annular edge of the sealed cavity. The isolation cavity is not communicated with the remaining part of the sealed cavity. The remaining part of the sealed cavity contains damping liquid. The annular edge is the edge of the rotor 10 that is radially away from the rotation center of the rotor 10; an elastic member 60, located in the isolation cavity, and the elastic member 60 is in contact with the mass block 50.

[0056] In the above embodiment, the remaining sealed cavity containing damping liquid is divided into two parts. One part is the space between the mass block, the stator annular tooth and the rotor annular tooth, and the other part is the space between the stator annular tooth and the rotor annular tooth. When the gear rotates at a low speed, the centrifugal force on the mass block is small, the elastic member deforms less, the distance between the mass block and the stator annular tooth and the rotor annular tooth is small, and more silicone oil remains between the stator annular tooth and the rotor annular tooth. Therefore, the damping torque is large. When the gear rotates at a high speed, the centrifugal force on the mass block is large, the elastic member is squeezed and deformed greatly, the distance between the mass block and the stator annular tooth and the rotor annular tooth is large, and the silicone oil between the stator and the rotor annular tooth enters the space vacated by the mass block under the action of centrifugal force, and the damping torque decreases, realizing that the damping torque can change with the rotational speed.

[0057] It should be noted that when the gear rotates at a low speed, the power requirement is not high. The damping torque of the damping gear is large, which can effectively reduce noise. When the gear rotates at a high speed, the power requirement is high, and the damping torque decreases to ensure power. Moreover, there are other noises, making the noise of the gear train not obvious. It is not necessary to completely eliminate the noise of the gear train.

[0058] In addition, in an alternative embodiment, the above-mentioned target gears include fuel injection pump gears, air compressor gears, and camshaft gears. For the same reasons as the above-mentioned fuel injection pump gears, the above-mentioned air compressor gears and camshaft gears will also generate negative torque, thus generating knocking noise. Of course, the above-mentioned target gears are not limited to this, and all gears that generate negative torque are applicable to the damping gears of the present application for noise reduction.

[0059] Since the damping torque of the above-mentioned damping gear is greater than or equal to the maximum negative torque of the above-mentioned target gear, knocking noise can be avoided. However, too large a damping torque will cause waste of mechanical energy. In an alternative embodiment, the damping torque of the above-mentioned damping gear is greater than or equal to 0.8 times the maximum negative torque of the above-mentioned target gear. For example, if the maximum negative torque of the above-mentioned target gear is 10 N / m, the damping torque greater than 8 N / m is sufficient.

[0060] In the above-mentioned embodiment, the damping torque of the above-mentioned damping gear is 0.8 times the maximum negative torque of the above-mentioned target gear, that is, most of the negative torque is offset, and the knocking noise generated by the remaining negative torque is small and does not affect the user experience. On the basis of achieving noise reduction, part of the mechanical energy is saved and the energy consumption is reduced.

[0061] In addition, the type of the above-mentioned damping fluid has a great influence on the noise reduction effect. In an alternative embodiment, the above-mentioned damping fluid is silicone oil. The viscosity of silicone oil is relatively large, and blocking the rotation of the rotor can provide a large damping torque, and the noise reduction effect is good. Of course, the above-mentioned damping fluid is not limited to silicone oil, and those skilled in the art can choose according to needs.

[0062] Furthermore, in an alternative embodiment, there are various types of the above-mentioned damping fluid, and the viscosities of different types of the above-mentioned damping fluid are different.

[0063] In the above-mentioned embodiment, the damping torque T = f(s, μ, θ), where s is the surface area of the annular teeth of the stator and the rotor participating in force transmission; μ is the viscosity of silicone oil; θ is the gap between the annular teeth of the stator and the rotor. Since there are various types of damping fluid and the viscosities of different types of the above-mentioned damping fluid are different, by providing different damping fluids, the damping torque of the damping gear can be adjusted, so that the damping gear can be applicable to different engine gear trains, greatly improving the versatility of the damping gear.

[0064] An embodiment according to the present application further provides a gear train, including a damping gear and a target gear. The damping gear meshes with the target gear. The target gear is a gear that generates negative torque during the working process, and the damping gear is any one of the above damping gears.

[0065] In the above gear train, the damping gear meshes with the target gear. By using the damping gear instead of the shear gear, as long as the damping torque of the damping gear is greater than or equal to the maximum negative torque of the target gear, the negative torque can be eliminated, and there will be no gear knocking noise. The damping torque is easy to control and has high stability, solving the problem of poor stability of the shear gear used in the prior art to reduce gear knocking noise.

[0066] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0067] 1) In the damping gear of the present application, the sealing part of the stator seals the rotating part to form a sealed cavity, and a damping liquid is contained in the sealed cavity, so that the damping liquid hinders the rotation of the rotor, and thus provides a damping torque to the meshing target gear through the gear part to offset the negative torque of the target gear, so as to avoid gear knocking noise and achieve noise reduction. Since the shear gear in the prior art realizes zero-clearance transmission through a certain shear amount to reduce noise, but the consistency control of the shear amount is poor, resulting in unstable noise reduction effect. By using the damping gear instead of the shear gear, as long as the damping torque of the damping gear is greater than or equal to the maximum negative torque of the target gear, the negative torque can be eliminated, and there will be no gear knocking noise. The damping torque is easy to control and has high stability, solving the problem of poor stability of the shear gear used in the prior art to reduce gear knocking noise.

[0068] 2) In the gear train of the present application, the damping gear meshes with the target gear. By using the damping gear instead of the shear gear, as long as the damping torque of the damping gear is greater than or equal to the maximum negative torque of the target gear, the negative torque can be eliminated, and there will be no gear knocking noise. The damping torque is easy to control and has high stability, solving the problem of poor stability of the shear gear used in the prior art to reduce gear knocking noise.

[0069] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A damping gear, characterized in that, Comprising: A rotor, including a gear portion and a rotating portion, the gear portion is used to mesh with a target gear, the rotating portion is connected to the gear portion, the gear portion is used to drive the rotating portion to rotate, and the target gear is a gear that has negative torque during the working process; A stator, the stator and the rotor form a sealed cavity, the rotating portion is located in the sealed cavity, and a damping liquid is contained in the sealed cavity. The rotating portion is a rotor annular tooth, the stator includes a stator annular tooth, both the stator annular tooth and the rotor annular tooth are located in the sealed cavity, and the axes of the rotor annular tooth and the stator annular tooth are parallel and spaced a predetermined distance; A mass block, located in the sealed cavity, such that an isolation cavity is formed between the mass block and the annular edge of the sealed cavity. The isolation cavity is not communicated with the remaining sealed cavity, and the remaining sealed cavity contains a damping liquid. The annular edge is the edge of the rotor that is radially away from the rotation center of the rotor; An elastic member, located in the isolation cavity, and the elastic member is in contact with the mass block.

2. The damping gear according to claim 1, wherein The target gear meshes with the damping gear and a first intermediate gear respectively, and the first intermediate gear is the transmission gear closest to the target gear in the gear train including the target gear.

3. The damping gear according to claim 1, wherein The damping gear meshes with the target gear and a second intermediate gear respectively to replace the first intermediate gear. The first intermediate gear is the transmission gear closest to the target gear in the gear train including the target gear, and the second intermediate gear is the transmission gear closest to the first intermediate gear in the gear train including the target gear.

4. The damping gear according to claim 1, characterized in that, There are multiple rotor annular teeth and stator annular teeth, and they correspond to each other one by one.

5. The damping gear according to any one of claims 1 to 4, characterized in that, The target gear includes an injection pump gear, an air compressor gear, and a camshaft gear.

6. The damping gear according to any one of claims 1 to 4, characterized in that The damping torque of the damping gear is greater than or equal to 0.8 times the maximum negative torque of the target gear.

7. The damping gear according to any one of claims 1 to 4, characterized in that, There are multiple types of the damping liquid, and the viscosities of different types of the damping liquid are different.

8. A gear train, characterized in that, Comprising a damping gear and a target gear, the damping gear meshes with the target gear, the target gear is a gear that has negative torque during the working process, and the damping gear is the damping gear according to any one of claims 1 to 7.

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