Penetrating type internal gear pump

Abstract

The utility model belongs to the technical field of power systems, and discloses a through type internal gear pump which comprises an oil pump shell, an internal gear, a driving external gear and an oil pump end cover, a cylindrical surface for radially supporting and limiting the internal gear is arranged in the oil pump shell, so that the excircle of the internal gear is limited in the oil pump shell, a crescent plate cambered surface for radially supporting the driving external gear is also arranged in the oil pump shell, and an addendum circle of an external tooth groove of the driving external gear is matched with the crescent plate cambered surface; the driving outer gear is of an inner-outer double-gear structure, inner teeth of the driving outer gear are meshed with an external driving shaft, and outer teeth of the driving outer gear are meshed with inner teeth of the inner gear; the oil pump end cover is installed at an opening of the oil pump shell in a covering mode. The oil pump end cover and the oil pump shell jointly conduct axial limiting on the inner gear and the driving outer gear. A through hole is formed between the oil pump shell and the oil pump end cover and matched with an external driving shaft in size. Annular space in the gear box is fully utilized, and axial installation is not limited.

Description

Technical Field

[0001] The utility model belongs to the technical field of power systems, relates to an oil gear pump, and particularly relates to a through-type internal meshing gear pump. Background Art

[0002] Internal meshing gear pumps are widely used in air turbine starters for aeroengines to lubricate the internal rotating components of the air turbine starter, especially the overrunning clutch assembly, and prevent the rotating components of the air turbine starter from jamming and sintering due to poor lubrication, which may cause engine damage.

[0003] Existing internal meshing gear pumps are all enclosed, such as CN201920622394.2. When such gear pumps are installed and used, they must be arranged at the end face of the drive shaft, resulting in limited structure and wasting internal space to a certain extent.

[0004] As aerospace products, weight and volume are extremely important indicators for air turbine starters. The internal transmission gear train of the air turbine starter has a complex structure, and there are many positions where lubricating oil is required, and the installation space is extremely limited. On the one hand, the oil pump needs to be driven by the drive shaft of the air turbine starter, otherwise additional driving equipment is required, which requires a larger structural space and weight; on the other hand, the oil pump needs to be installed in the middle of the drive shaft as much as possible to make full use of the internal annular space of the air turbine starter, otherwise a special structure needs to be designed at the shaft end face for installing and fixing the oil pump. Therefore, an oil pump product with an unrestricted installation position and a shared drive shaft is needed. There is no such oil pump product on the market currently, nor any technical literature to solve such problems. Content of the Utility Model

[0005] In order to solve the above problems, the utility model provides a through-type internal meshing gear pump, which can be installed and arranged at any position on the drive shaft, thus solving the problem of limited installation structure of the gear pump. At the same time, the overall structure of the gear pump is annular, which can make full use of the internal structure space of the air turbine starter.

[0006] The technical solution of the utility model is as follows:

[0007] A through-type internal gear pump includes an oil pump housing, an internal gear, a driving external gear, and an oil pump end cover. The interior of the oil pump housing has a cylindrical surface for radially supporting and positioning the internal gear, such that the outer circle of the internal gear is positioned within the oil pump housing. The interior of the oil pump housing also has a crescent plate arc surface for radially supporting the driving external gear, and the tip circle of the tooth groove on the outside of the driving external gear mates with the crescent plate arc surface. The driving external gear has a structure of an inner and outer double gear. The inner teeth of the driving external gear mesh with the external driving shaft, and the outer teeth of the driving external gear mesh with the inner teeth of the internal gear. The oil pump end cover is installed to cover the opening of the oil pump housing, and the oil pump end cover and the oil pump housing jointly perform axial positioning on the internal gear and the driving external gear. The oil pump housing and the oil pump end cover have a structure with a through hole in the middle, and the size of the through hole matches that of the external driving shaft.

[0008] Furthermore, the internal gear and the driving external gear are an eccentrically mated inner and outer double gear structure.

[0009] Furthermore, the internal tooth groove of the driving external gear matches the external driving shaft, and it can be a spline structure or a flat key structure.

[0010] Furthermore, the external tooth groove of the driving external gear and the internal tooth groove of the internal gear form a pair of meshing pairs, and their gear parameters match the inner cylindrical surface of the oil pump housing, the crescent plate arc surface of the oil pump housing, the through hole of the oil pump housing, and the through hole of the oil pump end cover. On the one hand, it realizes the oil suction and oil discharge functions, and on the other hand, it ensures sealing.

[0011] Furthermore, the oil pump housing has an oil suction chamber structure and an annular oil discharge chamber structure. The oil suction chamber structure is arranged upstream of the rotation direction of the driving external gear, and the annular oil discharge chamber structure is arranged downstream of the rotation direction of the driving external gear. Both the oil suction chamber structure and the annular oil discharge chamber structure are enlarged inner cavity structures, and both are provided with oil paths communicating with the outside.

[0012] Furthermore, the annular oil discharge chamber structure is provided with an oil retaining boss when turning from the rotation direction of the driving external gear to the oil suction chamber structure.

[0013] Furthermore, the annular oil discharge chamber structure, the oil suction chamber structure, the oil retaining boss, and the oil path are all structures integrated with the oil pump housing.

[0014] Furthermore, the driving external gear inputs torque through the internal tooth groove and outputs torque through the external tooth groove.

[0015] Furthermore, both the outer circumferences of the oil pump housing and the oil pump end cover are provided with flat key limiting grooves for the circumferential limiting of the entire oil pump.

[0016] Furthermore, the external driving shaft is the rotating shaft in an air turbine starter, and the through-type internal gear pump is arranged in the gearbox of the air turbine starter, specifically between the gear systems connected to the driving shaft.

[0017] Furthermore, the through-type internal gear pump can be adaptively arranged at any position on the drive shaft according to the structural characteristics of different transmission gear systems, making full use of the space in the gearbox and reducing the size and weight of the gearbox.

[0018] Furthermore, the through-type internal gear pump is particularly suitable for aerospace products such as air turbine starters that require a compact structure.

[0019] Furthermore, the through-type internal gear pump can be used in conventional application scenarios where the internal drive shaft rotates and the oil pump housing is fixed.

[0020] Furthermore, by designing the outer cylindrical surface of the oil pump housing into a structure coaxial with the central through-hole, the through-type internal gear pump can be further used in the scenario of differential rotation between the internal drive shaft and the rotating shaft of the external fixed oil pump housing. In this structure, the flow rate of the oil pump can be adjusted according to the differential speed at any time.

[0021] Beneficial effects:

[0022] 1. The present utility model adopts a through-type internal gear pump, which is an overall ring structure, can make full use of the annular space inside the gearbox, and has a compact radial structure;

[0023] 2. The gear pump can be adaptively arranged at any position on the drive shaft according to the structural characteristics of the internal transmission gear system in the gearbox, with no restrictions on axial installation and a wide range of application scenarios;

[0024] 3. The oil inlet and outlet structure of the gear pump is integrally designed with the housing. The oil pump has few parts, only a total of 4 parts, is light in weight, has a simple structure, is convenient for assembly, and has high reliability;

[0025] 4. The gear pump can be used in conventional application scenarios where the internal drive shaft rotates and the oil pump housing is fixed, and can also be used in the scenario of differential rotation between the internal drive shaft and the rotating shaft of the external fixed oil pump housing;

[0026] 5. In the scenario of differential rotation, the gear pump can adjust the flow rate of the oil pump according to the differential speed at any time. Description of the drawings

[0027] Figure 1 is a schematic structural diagram of the present utility model;

[0028] Figure 2 is a schematic diagram of the oil pump housing of the present utility model;

[0029] Figure 3 is a schematic diagram of the driving external gear of the present utility model;

[0030] Among them, 1. oil pump housing; 2. inner gear; 3. driving outer gear; 4. oil pump end cover; 1-1. annular oil discharge cavity structure of the oil pump housing; 1-2. oil suction cavity structure of the oil pump housing; 3-1. external tooth grooves of the driving outer gear; 3-2. internal tooth grooves of the driving outer gear. Specific implementation mode

[0031] The present utility model is realized by the following technical solutions.

[0032] Embodiment 1:

[0033] A through-type internal meshing gear pump includes an oil pump housing 1, an inner gear 2, a driving outer gear 3 and an oil pump end cover 4; the inside of the oil pump housing 1 has a cylindrical surface for radially supporting and limiting the inner gear 2, so that the outer circle of the inner gear 2 is limited within the oil pump housing 1, and the inside of the oil pump housing 1 also has a crescent plate arc surface for radially supporting the driving outer gear 3, and the pitch circle of the external tooth grooves of the driving outer gear 3 cooperates with the crescent plate arc surface; the driving outer gear 3 is a structure of an internal and external double gear, the internal teeth of the driving outer gear 3 are meshed with the external driving shaft, and the external teeth of the driving outer gear 3 are meshed with the internal teeth of the inner gear 2; the oil pump end cover 4 is installed and covered at the opening of the oil pump housing 1, and the oil pump end cover 4 and the oil pump housing 1 jointly axially limit the inner gear 2 and the driving outer gear 3; the oil pump housing 1 and the oil pump end cover 4 are structures with through holes in the middle, and the size of the through holes matches that of the external driving shaft.

[0034] The inner gear 2 and the driving outer gear 3 are an eccentrically matched internal and external double gear structure.

[0035] The internal tooth grooves 3-2 of the driving outer gear 3 match the external driving shaft, and can be a spline structure or a flat key structure.

[0036] The external tooth grooves 3-1 of the driving outer gear 3 and the internal tooth grooves of the inner gear 2 form a pair of meshing pairs, and their gear parameters match the inner cylindrical surface of the oil pump housing 1, the crescent plate arc surface of the oil pump housing 1, the through hole of the oil pump housing 1, and the through hole of the oil pump end cover 4. On the one hand, the oil suction and discharge functions are realized, and on the other hand, the sealing is ensured.

[0037] The oil pump housing 1 has an oil suction cavity structure 1-2 and an annular oil discharge cavity structure 1-1. The oil suction cavity structure 1-2 is arranged upstream of the rotation direction of the driving outer gear 3, and the annular oil discharge cavity structure 1-1 is arranged downstream of the rotation direction of the driving outer gear 3. Both the oil suction cavity structure 1-2 and the annular oil discharge cavity structure 1-1 are enlarged inner cavity structures, and both are provided with oil paths communicating with the outside.

[0038] The annular oil discharge cavity structure 1-1 is provided with an oil retaining boss from the rotation direction of the driving outer gear 3 to the oil suction cavity structure 1-2.

[0039] The annular oil drainage cavity structure 1-1, the oil suction cavity structure 1-2, the oil retaining boss and the oil passage are all structures integrated with the oil pump housing 1.

[0040] The driving external gear 3 inputs torque through the internal tooth groove 3-2 and outputs torque through the external tooth groove 3-1.

[0041] Flat key limiting grooves are provided on the outer circumferences of both the oil pump housing 1 and the oil pump end cover 4 for the circumferential limitation of the whole oil pump.

[0042] The external drive shaft is the rotating shaft in the air turbine starter, and the through-type internal meshing gear pump is arranged in the gearbox of the air turbine starter, specifically between the gear systems connected to the drive shaft.

[0043] The through-type internal meshing gear pump can be adaptively arranged at any position on the drive shaft according to the structural characteristics of different transmission gear systems, making full use of the space in the gearbox and reducing the size and weight of the gearbox.

[0044] The through-type internal meshing gear pump is especially suitable for aerospace products such as air turbine starters with requirements for compact structure.

[0045] The through-type internal meshing gear pump can be used in conventional application scenarios where the internal drive shaft rotates and the oil pump housing is fixed.

[0046] By designing the outer cylindrical surface of the oil pump housing into a structure coaxial with the central through hole, the through-type internal meshing gear pump can be further used in the scenario of differential rotation of the internal drive shaft and the external fixed oil pump housing rotating shaft. In this structure, the flow rate of the oil pump can be adjusted according to the differential speed at any time.

[0047] Embodiment 2:

[0048] The purpose of the present utility model is to provide a through-type internal meshing gear pump structure to solve the problem of limited installation structure of the gear pump. By adopting a through structure, the gear pump can be freely installed at any position on the shaft. Through the integrated design of the oil inlet and oil discharge structures with the housing, the number of parts is reduced, and the overall structure is simple, lightweight and highly reliable. To make the above objects, features and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] As Figure 1As shown in the figure, the gear pump structure of the present utility model mainly includes: an oil pump housing, an inner gear, a driving outer gear, and an oil pump end cover. The inner circumferential surface of the oil pump housing and the outer circumferential surface of the inner gear are in a small clearance fit to achieve the sliding support function for the inner gear. The inner arc surface of the crescent plate in the oil pump housing and the outer circle of the external tooth grooves of the driving outer gear are in a small clearance fit, and the tooth grooves of the inner gear and the external tooth grooves of the driving outer gear form a gear pair connection to jointly achieve the sliding support function for the driving outer gear. The oil pump housing and the oil pump end cover are centered by a cylindrical surface, and the two cooperate to achieve the axial positioning of the inner gear and the driving outer gear.

[0050] As Figure 2 shown in the figure, the oil pump housing of the present utility model can not only provide support for the inner gear and the driving outer gear, but also has an annular oil discharge chamber structure and an oil suction chamber structure.

[0051] As Figure 3 shown in the figure, the driving outer gear of the present utility model has internal tooth grooves and external tooth grooves. Among them, the internal tooth groove is the torque input end, and the external tooth groove is the torque output end. The internal tooth groove can adopt a spline structure or a flat key structure.

[0052] The present utility model can be applied to a differential rotation scenario, where the driving shaft is the inner shaft, the external rotating shaft is the outer shaft, the annular space formed by the inner and outer shafts is the installation space of the gear pump of the present utility model, and the coaxial arrangement structure of the inner and outer shafts is the most common structure form of the gearbox. The differential rotation of the inner shaft and the outer shaft determines the flow rate of the gear pump of the present utility model. Two seals are installed inside the oil inlet ring to cooperate with the outer shaft to achieve circumferential orientation of the oil inlet.

[0053] The above embodiments are only used to illustrate the technical concept and features of the present utility model. The purpose is to enable those skilled in the art to understand the content of the present utility model and implement it accordingly, and it cannot be used to limit the protection scope of the present utility model. All equivalent transformations or modifications made according to the spirit essence of the present utility model should be covered within the protection scope of the present utility model. The technologies, shapes, and structures not described in detail in the present utility model are all well-known technologies.

Claims

1. A through-type internal gear pump, characterized in that, It includes an oil pump housing (1), an internal gear (2), a driving external gear (3), and an oil pump end cover (4); inside the oil pump housing (1), there is a cylindrical surface for radially supporting and positioning the internal gear (2), so that the outer circle of the internal gear (2) is positioned within the oil pump housing (1). Inside the oil pump housing (1), there is also a crescent plate arc surface for radially supporting the driving external gear (3), and the pitch circle of the external tooth groove of the driving external gear (3) mates with the crescent plate arc surface; the driving external gear (3) has a structure of an internal and external double gear. The internal teeth of the driving external gear (3) mesh with the external drive shaft, and the external teeth of the driving external gear (3) mesh with the internal teeth of the internal gear (2); the oil pump end cover (4) is installed to cover the opening of the oil pump housing (1), and the oil pump end cover (4) and the oil pump housing (1) jointly perform axial positioning on the internal gear (2) and the driving external gear (3); the oil pump housing (1) and the oil pump end cover (4) have a structure with a through hole in the middle, and the size of the through hole matches the external drive shaft.

2. The through-type internal gear pump according to claim 1, characterized in that, The internal gear (2) and the driving external gear (3) are an internal and external double gear structure with eccentric mating.

3. The through-type internal gear pump according to claim 2, characterized in that, The internal tooth groove (3-2) of the driving external gear (3) matches the external drive shaft, specifically a spline structure or a flat key structure.

4. The through-type internal gear pump according to claim 2, characterized in that, The external tooth groove (3-1) of the driving external gear (3) and the internal tooth groove of the internal gear (2) form a pair of meshing pairs, and their gear parameters match the inner cylindrical surface of the oil pump housing (1), the crescent plate arc surface of the oil pump housing (1), the through hole of the oil pump housing (1), and the through hole of the oil pump end cover (4).

5. A through-type internal gear pump according to claim 1, characterized in that, Inside the oil pump housing (1), there is an oil suction chamber structure (1-2) and an annular oil discharge chamber structure (1-1). The oil suction chamber structure (1-2) is arranged upstream of the rotation direction of the driving external gear (3), and the annular oil discharge chamber structure (1-1) is arranged downstream of the rotation direction of the driving external gear (3). Both the oil suction chamber structure (1-2) and the annular oil discharge chamber structure (1-1) are enlarged inner cavity structures, and both are provided with oil paths communicating with the outside.

6. The through-type internal gear pump according to claim 5, characterized in that, The annular oil discharge chamber structure (1-1) is provided with an oil retaining boss from the rotation direction of the driving external gear (3) to the oil suction chamber structure (1-2).

7. The through-type internal gear pump according to claim 6, characterized in that, The annular oil discharge chamber structure (1-1), the oil suction chamber structure (1-2), the oil retaining boss, and the oil path are all structures integrated with the oil pump housing (1).

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