Sealing device, gear pump and vehicle

Abstract

The utility model relates to the technical field of gear transmission sealing, in particular to a sealing device, a gear pump and a vehicle, the sealing device comprises a sealing disc and a boss, the sealing disc is provided with the boss, the end face of the side, away from the sealing disc, of the boss is a plane, the boss is provided with a plurality of sealing ring grooves, and the sealing ring grooves are arranged in the radial direction of the sealing disc at intervals; first protrusions are formed among the multiple sealing ring grooves, and a first preset distance is formed between every two adjacent first protrusions in the radial direction of the sealing disc. According to the sealing device, the leakage amount can be reduced, operation abrasion is reduced, and the volume efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gear transmission sealing, in particular to a sealing device, a gear pump and a vehicle. BACKGROUND

[0002] The hydraulic internal gear pump adopts the internal gear meshing principle, the pitch circles of the internal and external gears are close to each other on one side, and the other side is separated by a crescent plate on the pump cover. The driving internal gear on the main shaft drives the external gear to rotate in the same direction. At the inlet, the gears are separated from each other to form negative pressure to suck in liquid. At the outlet, the gears are continuously meshed to extrude and output the liquid.

[0003] A power transmission device of an internal gear pump of an automobile hydraulic retarder is provided in the related art, which seals the internal and external gears by a sealing plate. However, when the distance is too far, the leakage between the gear and the sealing plate is too large, which affects the volumetric efficiency of the oil pump, and further affects the output efficiency of the internal gear pump. SUMMARY

[0004] The present application provides a sealing device, which can reduce the leakage and improve the volumetric efficiency. The present application also provides a gear pump. The present application also provides a vehicle.

[0005] The sealing device of the present application comprises:

[0006] The sealing disc is provided with a boss, and the side end face of the boss away from the sealing disc is a plane,

[0007] A plurality of sealing ring grooves are arranged on the boss, and the plurality of sealing ring grooves are arranged at intervals in the radial direction of the sealing disc. The plurality of sealing ring grooves form first protrusions, and the plurality of adjacent first protrusions have a first preset interval in the radial direction of the sealing disc.

[0008] The present application provides a sealing device, which can reduce the leakage, reduce the running wear, and improve the volumetric efficiency.

[0009] In some embodiments, the size of the cross section of the sealing ring groove in the axial direction of the sealing disc gradually increases in the direction away from the sealing disc.

[0010] In some embodiments, the first preset interval A of the plurality of adjacent first protrusions in the radial direction of the sealing disc is 0.2mm≤A≤1.0mm.

[0011] In some embodiments, a second preset interval B is provided between the first protrusion and the internal gear or the external gear of the gear pump, and 0mm≤B≤0.2mm.

[0012] In some embodiments, the third preset distance C is provided between the bottom of the sealing ring groove and the inner gear or the outer gear of the gear pump, and 0.5mm≤C≤2mm.

[0013] In some embodiments, the first protrusion has a dimension D in the axial direction of the sealing disc, and 0.5mm≤D<2.0mm.

[0014] In some embodiments, the sealing device further comprises a plurality of sealing rings, each of the inner gear and the outer gear of the gear pump is provided with a sealing ring, the sealing ring extends towards the sealing disc to extend into the sealing ring groove, and the plurality of sealing rings correspond to the plurality of sealing ring grooves one by one.

[0015] In some embodiments, the fourth preset distance is provided between the sealing ring and the bottom of the sealing ring groove.

[0016] The gear pump of the embodiments of the present application comprises: a sealing device, which is the sealing device described above; an inner gear, an outer gear, and a housing, the housing has a receiving cavity to accommodate the inner gear and the outer gear, the inner gear and the outer gear are engaged with each other to form a gear set, and the sealing device is arranged between the inner wall surface of the housing and the gear set.

[0017] A sealing ring is arranged between the sealing device and the inner wall surface of the housing.

[0018] The present application provides a gear pump, which adopts the sealing device described above, reduces running wear, can reduce the leakage amount, and improves volumetric efficiency.

[0019] The vehicle of the embodiments of the present application comprises the gear pump described above.

[0020] The present application provides a vehicle, which adopts the gear pump described above, can reduce the leakage amount, reduces running wear, and improves volumetric efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 An exploded schematic view of a gear pump provided by the embodiments of the present application;

[0023] Figure 2 A schematic view of a sealing device provided by the embodiments of the present application;

[0024] Figure 3 A sectional schematic view of a gear pump provided by the embodiments of the present application;

[0025] Figure 4 A schematic view of a sealing disc provided for the embodiments of the present application;

[0026] Figure 5 A schematic view of a sealing ring groove provided for the embodiments of the present application.

[0027] Figure 6 A schematic view of a sealing ring provided for the embodiments of the present application.

[0028] Figure 7 A schematic view of a sealing ring provided for the embodiments of the present application.

[0029] Figure 8 A schematic view of a sealing ring provided for the embodiments of the present application.

[0030] Among the above drawings, the following reference signs are included:

[0031] a sealing disc 1,

[0032] a boss 2, a sealing ring groove 21, a first protrusion 22,

[0033] a sealing ring 3,

[0034] an inner gear 10, an outer gear 20, a housing 30, a sealing ring 40, a sealing device 50. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0036] It should be noted that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. The terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. The terms "parallel", "perpendicular", "equal" include the described case and the approximate case of the described case, and the approximate case is within the acceptable deviation range, wherein the acceptable deviation range is determined by the person skilled in the art considering the measurement being discussed and the error related to the measurement of the specific quantity (i.e. the limitation of the measurement system). For example, "parallel" includes absolute parallel and approximate parallel, wherein the acceptable deviation range of approximate parallel can be, for example, within 5°; "perpendicular" includes absolute perpendicular and approximate perpendicular, wherein the acceptable deviation range of approximate perpendicular can also be, for example, within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality can be, for example, that the difference between the two equalities is less than or equal to 5% of either. For those skilled in the art, the specific meaning of the above terms in the present application can be understood in specific cases.

[0037] In order for those skilled in the art to better understand the scheme of the present application, the present application will be further described in detail below in conjunction with the drawings and specific embodiments.

[0038] The sealing device 50 of the embodiment of the present application comprises a sealing disc 1 and a boss 2, the sealing disc 1 is provided with the boss 2, and the side end face of the boss 2 away from the sealing disc 1 is a plane, a plurality of sealing ring grooves 21 are arranged on the boss 2, the plurality of sealing ring grooves 21 are arranged at intervals in the radial direction of the sealing disc 1, a first protrusion 22 is formed between the plurality of sealing ring grooves 21, and a first predetermined interval is provided in the radial direction of the sealing disc 1 between a plurality of adjacent first protrusions 22.

[0039] The present application provides a sealing device 50, which can reduce the leakage amount and improve the volumetric efficiency.

[0040] Specifically, as shown in Figures 1 to 8 the sealing disc 1 is arranged in a gear pump, and the gear pump can be an internal gear pump.

[0041] The boss 2 is located on the end face of the sealing disk 1 facing the internal gear 10 and the external gear 20. The boss 2 is provided with a plurality of sealing ring grooves 21 arranged radially at intervals on the sealing disk 1. Adjacent sealing ring grooves 21 form a first protrusion 22. The first protrusion 22 extends toward the internal gear 10 and the external gear 20 so that the sealing ring grooves 21 can accommodate a preset capacity of oil to perform dynamic sealing of the working cavity between the internal gear 10, the gear, and the crescent plate.

[0042] During operation of the existing gear pump, the internal and external gears 20 rotate relative to the sealing disc 1. Leakage between the sealing disc 1 and the internal and external gears 20 will affect the volumetric efficiency of the gears. At the same time, abnormal wear will occur between the sealing disc 1 and the internal and external gears 20 due to the rotation of the internal and external gears 20.

[0043] By setting multiple sealing ring grooves 21 to accommodate a certain amount of liquid, lubrication is provided to the friction pair at that location, reducing wear. Alternatively, it can be understood that the sealing ring grooves 21 hold a preset capacity of oil. During the operation of the gear pump, as the internal gear 10 and external gear 20 rotate relative to each other, a dynamic oil film forms within the sealing ring grooves 21. When the internal gear 10 and external gear 20 move relative to the sealing disc 1, the oil film acts as a buffer and seal, preventing oil leakage from the gap between the sealing disc 1 and the gears. This dynamically seals the working cavity between the internal gear 10, external gear 20, and the crescent plate, reducing leakage during gear pump operation, improving the output efficiency of the gear pump, and reducing wear and vibration during gear pump operation, ensuring the normal operation of the gear pump.

[0044] Multiple sealing ring grooves 21 form multiple independent oil storage spaces. The first protrusion 22 formed between adjacent sealing ring grooves 21 extends towards the internal gear 10 and external gear 20, reducing the contact area with the gears. This prevents excessive wear caused by the protrusion 2 or sealing disc 1 fully contacting the gears during gear rotation, while also reducing vibration and noise of the gear pump and improving its volumetric and output efficiency. The presence of the first protrusion 22 further prevents oil leakage between different sealing ring grooves 21. The sealing ring grooves 21 also supply oil to the end faces of the first protrusion 22 facing the internal and external gears 20. Simultaneously, an oil film forms between the multiple first protrusions 22 and the internal and external gears 20, sealing the oil in the working chamber of the gear pump and improving its volumetric efficiency.

[0045] The first protrusion 22 has a first preset distance in the radial direction of the sealing disc 1. The size of the first preset distance can be set according to the viscosity of the oil or other operating parameters to ensure that there is a preset amount of oil in the sealing ring groove 21 for sealing.

[0046] This application provides a sealing device 50, which includes a boss 2 and a sealing ring groove 21. The sealing ring groove 21 contains a preset amount of oil. When the internal gear 10 and the external gear 20 move relative to the sealing disc 1, the oil flows to the sealing ring groove 21 and the gap between the boss 2 and the internal and external gears 20 to form an oil film. The oil film buffers and seals the gap between the sealing disc 1 and the gears, preventing oil leakage from the gap between the sealing disc 1 and the gears. This dynamically seals the working cavity between the internal gear 10, the external gear 20, and the crescent plate, reducing leakage during gear pump operation, thereby reducing leakage and improving volumetric efficiency.

[0047] By setting the first protrusion 22, the protrusion 2 or the sealing disc 1 is prevented from directly contacting the gear, which would cause wear. This reduces the contact area, thereby reducing wear, vibration and noise during gear pump operation, and improving the stability and lifespan of the gear pump.

[0048] In some embodiments, the size of the cross-section of the sealing ring groove 21 in the axial direction of the sealing disk 1 gradually increases in the direction away from the sealing disk 1.

[0049] Specifically, such as Figures 1 to 8 As shown, the cross-section of the sealing ring groove 21 in the axial direction (i.e., the direction perpendicular to the end face of the sealing disc 1) is trapezoidal or flared, and its width gradually increases in the direction away from the sealing disc 1. That is, when the oil enters the gradually changing cross-section, the pressure gradient formed by the cross-section change causes the oil to flow towards the area with smaller gaps. After hitting the bottom of the sealing ring groove 21, it flows outward from the middle part of the sealing ring groove 21 or forms turbulence in the sealing ring groove 21, and then flows to the space between the first protrusion 22 and the internal gear 10 or the external gear 20 to form a stable oil film, i.e., the wedge effect, to form a stable oil film, reduce wear and noise.

[0050] The sealing device 50 of this application embodiment provides a sealing ring groove 21 whose cross-sectional area in the axial direction of the sealing disc 1 gradually increases in the direction away from the sealing disc 1, so that oil forms an oil film between the sealing disc 1 or the boss 2, thereby reducing the wear between the gear and the sealing disc 1 or the boss 2.

[0051] In some embodiments, the first preset distance A between a plurality of adjacent first protrusions 22 in the radial direction of the sealing disc 1 is 0.2mm≤A≤1.0mm.

[0052] Specifically, such as Figures 1 to 8As shown, A can be A = 0.2mm, A = 0.3mm, A = 0.4mm, A = 0.5mm, A = 0.6mm, A = 0.7mm, A = 0.8mm, A = 0.9mm, or A = 1.0mm. Different spacing sizes can be used according to different usage requirements to store a preset amount of oil in the sealing ring groove 21, thereby forming a lubricating oil film. This seals the internal gear 10, external gear 20, and the working chamber where the crescent plate is located, reducing leakage and improving the volumetric efficiency of the gear pump.

[0053] In some embodiments, a second preset distance B is provided between the first protrusion 22 and the internal gear 10 or external gear 20 of the gear pump, and 0mm≤B≤0.2mm.

[0054] Specifically, such as Figures 1 to 8 As shown, B can be 0mm, 0.1mm, or 0.2mm. Different sizes can be used depending on the viscosity of the oil, thereby ensuring the sealing effect while avoiding abnormal wear between the first protrusion 22 and the internal gear 10 or the external gear 20.

[0055] In some embodiments, a third preset distance C is provided between the bottom of the sealing ring groove 21 and the internal gear 10 or external gear 20 of the gear pump, and 0.5mm≤C≤2mm.

[0056] Specifically, such as Figures 1 to 8 As shown, when the C value is too small, the distance between the bottom of the sealing ring groove 21 and the gear is too close. Although theoretically a tighter sealing structure can be formed, in actual operation, tiny impurities in the oil and metal shavings generated by gear operation are prone to accumulate in the narrow gap, leading to wear on the sealing surface and thus damaging the sealing effect. At the same time, too small a distance makes it difficult for the oil film to form, increasing frictional resistance and affecting the efficiency of the gear pump. When the C value is too large, although it provides sufficient space for oil flow and impurity discharge, it leads to insufficient oil film pressure in the sealing area between the sealing ring groove 21 and the gear, making it difficult to effectively prevent oil leakage. Furthermore, an excessively large distance also reduces the overall structural compactness of the gear pump, increasing the size and weight of the equipment.

[0057] By setting C to 0.5mm≤C≤2mm, a suitable C value can ensure the stability of the oil film between the sealing disc 1 and the internal and external gears 20, avoid oil film rupture and dry friction, improve the sealing performance, lubrication performance and efficiency of the gear pump, extend the service life of the equipment, and reduce operating costs.

[0058] In some embodiments, the dimension of the first protrusion 22 in the axial direction of the sealing disc 1 is D, and 0.5mm≤D<2.0mm.

[0059] Specifically, such as Figures 1 to 8As shown, the axial dimension of the first protrusion 22 on the sealing disc 1 determines the size of the sealing gap formed between it and the gear or other sealing components, i.e., the volume of the sealing ring groove 21. When oil enters the sealing area, the axial dimension of the first protrusion 22 on the sealing disc 1 directly affects the amount of oil contained in the sealing ring groove 21 and the corresponding sealing effect. In other words, a suitable size allows the oil to form a stable oil film in the sealing gap, preventing further leakage.

[0060] In some embodiments, the sealing device 50 further includes a plurality of sealing rings 3. Both the internal gear 10 and the external gear 20 of the gear pump are provided with sealing rings 3. The sealing rings 3 extend toward the sealing disc 1 to enter the sealing ring groove 21, and the plurality of sealing rings 3 correspond one-to-one with the plurality of sealing ring grooves 21.

[0061] Specifically, such as Figures 1 to 8 As shown, the sealing ring 3 is installed on the internal gear 10 or external gear 20 of the gear pump. One end of the sealing ring 3 extends into the sealing ring groove 21, so that the oil forms a zigzag sealing structure within the sealing ring groove 21. This bent structure reduces the flow velocity of the oil within the sealing ring groove 21, increases the storage time of the oil within the sealing ring groove 21, and prevents the oil in the sealing ring groove 21 from being directly thrown out due to excessively high rotational speed of the internal gear 10 or external gear 20. Alternatively, the zigzag sealing structure formed by the sealing ring 3 extending into the sealing ring groove 21 increases the resistance to oil flow. For example, if the oil originally flows in a straight line within the sealing ring groove 21 at a relatively high speed, the zigzag structure is like setting multiple bends in the channel, requiring the oil to constantly change its flow direction, significantly reducing the flow velocity. Simultaneously, the sealing ring 3 and the first protrusion 22 buffer the oil flowing from the center of the internal gear 10 and the external gear 20 to the gear tooth tip, preventing the oil from directly flowing out of the sealing structure formed by the sealing ring groove 21 and the sealing ring 3 under the rotation of the gears. This further improves sealing performance and volumetric efficiency.

[0062] Furthermore, a fourth preset gap is provided between the sealing ring 3 and the bottom of the sealing ring groove 21. By setting the fourth gap, wear caused by the sealing ring 3 being too close to the bottom of the sealing ring groove 21 is avoided, or the sealing performance is reduced due to the gap being too large.

[0063] The gear pump of this application embodiment includes: a sealing device 50 (as described above), an internal gear 10, an external gear 20, and a housing 30. The housing 30 has a receiving cavity for mounting the internal gear 10 and the external gear 20. The internal gear 10 and the external gear 20 mesh with each other to form a gear set. The sealing device 50 is disposed between the inner wall surface of the housing 30 and the gear set.

[0064] A sealing ring 40 is disposed between the sealing device 50 and the inner wall of the housing 30. That is, the sealing ring 40 is disposed on the end face of the sealing disc 1 away from the internal gear 10 and the external gear 20, and the end face of the sealing disc 1 facing the internal gear 10 and the external gear 20 is provided with a boss 2.

[0065] Specifically, such as Figures 1 to 8 As shown, the gear pump is an internal gear pump. The housing 30 has a cavity for installing the internal gear 10 and the external gear 20, as well as a sealing device 50 and an existing crescent plate. The sealing ring 40 is disposed between the sealing device 50 and the inner wall of the housing 30 to form a sealing cavity through the sealing disc 1 and the sealing ring 40, thereby establishing pressure and sealing the internal and external gears 20 of the working cavity surrounded by the sealing disc 1, reducing the amount of oil leakage, and thus improving the volumetric efficiency.

[0066] This application provides a gear pump that uses the aforementioned sealing device 50 to reduce leakage and improve volumetric efficiency.

[0067] The vehicle described in this application includes a gear pump as described above.

[0068] The vehicle in this embodiment of the application uses the aforementioned gear pump, which can reduce leakage and improve volumetric efficiency.

[0069] The foregoing has provided a detailed description of the method provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A sealing device, characterized in that, include: The sealing disc has a boss, and the side of the boss facing away from the sealing disc is flat. The protrusion is provided with a plurality of sealing ring grooves, which are arranged at intervals in the radial direction of the sealing disk. A first protrusion is formed between the plurality of sealing ring grooves, and the plurality of adjacent first protrusions have a first preset distance in the radial direction of the sealing disk.

2. The sealing device according to claim 1, characterized in that, The size of the cross-section of the sealing ring groove in the axial direction of the sealing disc gradually increases in the direction away from the sealing disc.

3. The sealing device according to claim 1, characterized in that, The plurality of adjacent first protrusions have a first preset spacing of A in the radial direction of the sealing disc, and 0.2mm≤A≤1.0mm.

4. The sealing device according to claim 2, characterized in that, A second preset distance B is provided between the first protrusion and the internal or external gear of the gear pump, and 0mm≤B≤0.2mm.

5. The sealing device according to claim 2, characterized in that, A third preset distance C is provided between the bottom of the sealing ring groove and the internal or external gear of the gear pump, and 0.5mm≤C≤2mm.

6. The sealing device according to claim 2, characterized in that, The first protrusion has a dimension D in the axial direction of the sealing disc, and 0.5mm≤D<2.0mm.

7. The sealing device according to claim 6, characterized in that, It also includes multiple sealing rings. Both the internal and external gears of the gear pump are provided with sealing rings. The sealing rings extend toward the sealing disc to enter the sealing ring grooves, and the multiple sealing rings correspond one-to-one with the multiple sealing ring grooves.

8. The sealing device according to claim 7, characterized in that, A fourth preset distance is provided between the sealing ring and the bottom of the sealing ring groove.

9. A gear pump, characterized in that, include: A sealing device, as described in any one of claims 1-8; An internal gear, an external gear, and a housing, the housing having a receiving cavity for mounting the internal gear and the external gear, the internal gear and the external gear meshing with each other to form a gear set, and a sealing device disposed between the inner wall surface of the housing and the gear set; A sealing ring is disposed between the sealing device and the inner wall surface of the housing.

10. A vehicle, characterized in that, Including the gear pump as described in claim 9.

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