Self-lubricating inner gearing cycloid lubricating pump

Abstract

The utility model belongs to the technical field of gearbox lubrication, and relates to a self-lubricating inner gearing cycloid lubrication pump. And the lubricating pump drives the lubricating oil to flow out from the interior of the gearbox and flow to a cooling system of the engineering machinery. The pump rotating shaft is arranged in the center of the pump shell, rotates relative to the pump shell under the driving of the driving piece and drives the internal rotor assembly to rotate. An oil inlet and an oil outlet of the pump are collinear, and the center line is perpendicular to the rotating shaft in an intersecting mode. The pump shell is a cuboid, and the face, perpendicular to the rotating shaft, of the pump shell is square. Therefore, the external mounting size is designed more conveniently, and the symmetrical design of the whole gearbox is realized more conveniently. A pressure cavity of the pump is communicated with a front-end cavity of the rotating shaft, so that a small part of lubricating oil flows through a gap between the shaft sleeve and the rotating shaft, and the pump is lubricated.

Description

Technical Field

[0001] This utility model belongs to the field of gearbox lubrication technology, and relates to a self-lubricating internal meshing cycloidal lubrication pump for circulating lubricating oil in the gearbox of engineering machinery. Background Technology

[0002] In the gearboxes of construction machinery, the design of the lubrication system is crucial, directly affecting the equipment's operating efficiency and service life. Existing lubrication pumps mostly employ traditional gear pumps or screw pumps. These pumps are often structurally complex and prone to uneven lubrication and excessively high oil temperatures during oil circulation. Furthermore, the cumbersome external connection dimensions of traditional lubrication pumps increase the workload during installation and maintenance and hinder the overall symmetrical design of the equipment.

[0003] Current technologies also have shortcomings in self-lubrication. Many lubrication pumps cannot effectively lubricate themselves, leading to increased pump body wear and affecting their service life and operating efficiency. Therefore, there is an urgent need for a new type of lubrication pump that can simplify the design of external connection dimensions and improve the overall installation convenience and symmetry while ensuring lubrication effect. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a self-lubricating internal meshing cycloidal lubrication pump.

[0005] To achieve the above objectives, the technical solution adopted is:

[0006] A self-lubricating internal meshing cycloidal lubrication pump includes a pump casing and a rotating shaft. The pump casing has a hexahedral structure, with a positioning boss on one end face and a rear cover connected to the opposite end face. Within the pump casing, between the positioning boss and the rear cover, there are sequentially connected rotating shaft front chambers, a central hole, and a rotor chamber. Each side of the central hole has a kidney-shaped cavity, designated as a low-pressure chamber and a high-pressure chamber, respectively, separated by a partition. The rotating shaft is located at the center of the pump casing and passes through the rotor chamber. 、 The pump housing has a central hole and a front cavity for the rotating shaft, and extends out of the positioning boss. A rotor assembly is provided inside the rotor cavity, and the rotor assembly is arranged around the outer circumference of the rotating shaft. One end face of the rotor assembly near the central hole abuts against the partition, and the other end face of the rotor assembly abuts against the rear cover. The pump housing has an oil inlet and an oil outlet. The oil inlet is connected to the low-pressure chamber, and the oil outlet is connected to the high-pressure chamber. A connecting hole is provided between the high-pressure chamber and the front cavity for the rotating shaft to connect them.

[0007] Furthermore, the oil inlet is located at the upper end of the pump housing, and the oil outlet is located at the lower end of the pump housing.

[0008] Furthermore, the low-pressure chamber is located above the central hole, and the high-pressure chamber is located below the central hole.

[0009] Furthermore, the hexahedron is a cuboid, one end face and the opposite end face of the pump casing are squares, and the rotating shaft passes through the center of the square.

[0010] The beneficial effects of adopting the above technical solution are as follows: The self-lubricating internal meshing cycloidal lubrication pump of this utility model is installed on the gearbox. The end of the rotating shaft away from the rear cover is connected to the drive shaft of the gearbox to provide power for the rotation of the rotating shaft. Specifically, it can be connected by a key or other means. When connected, the positioning boss can play a centering role, making it easy to align the rotating shaft with the drive shaft. The cuboid structure facilitates modular design, the pump body is compact, and it is easy to install in the gearbox. It is also more conducive to the overall symmetrical design of the gearbox and better space utilization. The kidney-shaped cavity design helps the circulation of lubricating oil. The rotor assembly abuts against the partition and the rear cover, ensuring the precise positioning of the rotor and the rotating shaft, and improving the stability and reliability of the pump. The connecting hole allows the lubricating oil to enter the front cavity of the rotating shaft from the high-pressure chamber, and then enter the gap between the rotating shaft and the bushing from the front cavity of the rotating shaft, and then flow back to the rotor cavity, realizing the self-lubrication of the pump shaft.

[0011] Furthermore, the oil inlet and the oil outlet are collinear and located at the center of the upper and lower end faces of the pump casing, respectively.

[0012] Furthermore, the rotor assembly includes an annular inner rotor and an outer rotor arranged around the outer periphery of the inner rotor. There is an eccentricity between the axis of the outer rotor and the axis of the inner rotor. The outer rotor meshes with the inner rotor, and the outer periphery of the outer rotor is clearance-fitted with the pump casing.

[0013] Furthermore, a bushing is provided between the central hole and the rotating shaft. The bushing is interference-fitted with the central hole and clearance-fitted with the rotating shaft.

[0014] The beneficial effects of adopting the above-mentioned further technical solutions are as follows: the rotating shaft rotates relative to the pump housing and the bushing under the drive of the output wheel box drive component, so that the rotating shaft can rotate flexibly, thereby driving the meshing motion of the inner rotor and the outer rotor to realize the circulation of lubricating oil; the bushing is interference-fitted with the center hole to ensure the stability of the bushing in the pump housing and reduce bushing displacement caused by vibration or impact.

[0015] Furthermore, the rotating shaft is connected to the inner rotor via a pin.

[0016] Furthermore, the rotating shaft is provided with a pin hole, and the pin shaft passes through the pin hole.

[0017] The beneficial effect of adopting the above two-step further technical solution is that the setting of the pin shaft and pin hole enables the inner rotor to rotate synchronously with the shaft.

[0018] Furthermore, an annular skeleton oil seal is provided in the front cavity of the rotating shaft, and the skeleton oil seal is located on the outer periphery of the rotating shaft.

[0019] The beneficial effect of adopting the above-mentioned further technical solutions is that it can effectively prevent lubricating oil from leaking out of the pump casing from the front cavity of the shaft.

[0020] Furthermore, the skeleton oil seal is provided with an elastic retaining ring on the side away from the rear cover.

[0021] The beneficial effect of adopting the above-mentioned further technical solutions is that it can increase the sealing performance of the skeleton oil seal and prevent lubricating oil leakage.

[0022] Furthermore, an O-ring is provided between the rear cover and the pump housing.

[0023] The beneficial effect of adopting the above-mentioned further technical solution is that the O-ring seal prevents lubricating oil from leaking from the gap between the rear cover and the pump housing.

[0024] Furthermore, the rear cover is connected to the pump housing by bolts.

[0025] Furthermore, the outer rotor is an annular structure with an inner groove, and the inner rotor is a shaft with blades. The blades can be embedded in the grooves, and the number of blades is different from the number of grooves, so that the outer rotor can mesh with the inner rotor to realize the circulation of lubricating oil.

[0026] Furthermore, the housing is provided with mounting holes around its perimeter, through which the self-lubricating internal meshing cycloidal lubrication pump is mounted on the gearbox by bolts passing through the holes.

[0027] Compared with the prior art, the beneficial effects of this utility model are as follows: the oil inlet and outlet of the self-lubricating internal meshing cycloidal lubrication pump of this utility model are collinear, and the center line intersects perpendicularly with the rotating shaft. The pump casing is a cuboid, and its face perpendicular to the rotating shaft is a square. This makes it easier to design its external installation dimensions and facilitates the overall symmetrical design of the gearbox. The high-pressure chamber of the pump is interconnected with the rotating shaft cavity, allowing a small portion of the lubricating oil to flow through the gap between the bushing and the rotating shaft, thereby achieving the pump's own lubrication. Attached Figure Description

[0028] Figure 1 This is a first-view perspective perspective view of the self-lubricating internal meshing cycloidal lubrication pump of this utility model.

[0029] Figure 2 This is a second-view perspective perspective view of the self-lubricating internal meshing cycloidal lubrication of this utility model;

[0030] Figure 3This is a third-view perspective perspective view of the self-lubricating internal meshing cycloidal lubrication pump of this utility model.

[0031] Figure 4 This is a three-dimensional structural view of the self-lubricating internal meshing cycloidal lubricating pump of this utility model after removing the pump casing and positioning boss.

[0032] Figure 5 This is a top view of the self-lubricating internal meshing cycloidal lubrication pump of this utility model;

[0033] Figure 6 for Figure 5 A cross-sectional view along the AA direction;

[0034] Figure 7 This is a structural diagram of the self-lubricating internal meshing cycloidal lubrication pump of this utility model without the rear cover.

[0035] Figure 8 This is a structural diagram of the self-lubricating internal meshing cycloidal lubrication pump of this utility model, excluding the rear cover, inner rotor, and outer rotor.

[0036] Figure 9 This is a structural schematic diagram of the skeleton oil seal, elastic retaining ring, rotating shaft and bushing of this utility model;

[0037] The attached diagram is labeled as follows: 1. Pump casing; 2. Shaft; 3. Positioning boss; 4. Rear cover; 5. O-ring seal; 11. Front cavity of shaft; 12. Center hole; 121. Shaft sleeve; 13. Rotor cavity; 131. Inner rotor; 132. Outer rotor; 133. Pin; 14. Low-pressure chamber; 15. High-pressure chamber; 16. Divider; 17. Oil inlet; 18. Oil outlet; 19. Connecting hole; 111. Skeleton oil seal; 112. Elastic retaining ring. Detailed Implementation

[0038] The present invention will be described below with reference to examples. The examples are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0039] In the description of this utility model, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] Reference Figures 1-9 A self-lubricating internal meshing cycloidal lubrication pump includes a pump housing 1 and a rotating shaft 2. The pump housing 1 has a hexahedral structure. One end face of the pump housing 1 is provided with a positioning boss 3, and the opposite end face is connected to a rear cover 4. Between the positioning boss 3 and the rear cover 4, the pump housing 1 is provided with a rotating shaft front cavity 11, a central hole 12, and a rotor cavity 13 that are connected in sequence. Each side of the central hole 12 is provided with a kidney-shaped cavity, namely a low-pressure chamber 14 and a high-pressure chamber 15, which are separated by a partition 16. The rotating shaft 2 is located at the center of the pump housing 1 and passes through the rotor cavity 13 and the central hole in sequence. 12. A front cavity 11 of the rotating shaft extends through the pump housing 1 from the inside of the positioning boss 3; a rotor assembly is provided in the rotor cavity 13, the rotor assembly is arranged around the outer periphery of the rotating shaft 2, one end face of the rotor assembly near the central hole 12 abuts against the partition 16, and the other end face of the rotor assembly abuts against the rear cover 4; the pump housing 1 is provided with an oil inlet 17 and an oil outlet 18, the oil inlet 17 is connected to the low-pressure chamber 14, the oil outlet 18 is connected to the high-pressure chamber 15, and a connecting hole 19 is provided between the high-pressure chamber 15 and the front cavity 11 of the rotating shaft to connect the high-pressure chamber 15 and the front cavity 11 of the rotating shaft.

[0042] In this embodiment, the oil inlet 17 is located at the upper end of the pump housing 1, and the oil outlet 18 is located at the lower end of the pump housing 1.

[0043] In this embodiment, the low-pressure chamber 14 is located above the central hole 12 and between the oil inlet 17 and the central hole 12, and the high-pressure chamber 15 is located below the central hole 12 and between the oil outlet 18 and the central hole 12.

[0044] It should be noted that the vertical positions of the oil inlet 17 and the oil outlet 18 are not absolute. That is to say, the oil inlet 17 and the low-pressure chamber 14 can also be located below the central hole 12, and the oil outlet 18 and the high-pressure chamber 15 can also be located above the central hole 12.

[0045] In an optional embodiment, the hexahedron is a cuboid, one end face and the opposite end face of the pump housing 1 are squares, and the rotating shaft 2 passes through the center of the square.

[0046] In an optional embodiment, the oil inlet 17 and the oil outlet 18 are collinear and are located at the center of the upper and lower end faces of the pump housing 1, respectively.

[0047] In this embodiment, a bushing 121 is provided between the central hole 12 and the rotating shaft 2. The bushing 121 is interference-fitted with the central hole 12 and clearance-fitted with the rotating shaft 2.

[0048] In this embodiment, the rotor assembly includes an annular inner rotor 131 and an outer rotor 132 arranged around the outer periphery of the inner rotor 131. There is an eccentricity between the axis of the outer rotor 132 and the axis of the inner rotor 131. The outer rotor 132 meshes with the inner rotor 131 for transmission. The outer periphery of the outer rotor 132 is clearance-fitted with the pump housing 1.

[0049] In this embodiment, the rotating shaft 2 is connected to the inner rotor 131 by a pin 133. The rotating shaft 2 is provided with a pin hole, and the pin 133 passes through the pin hole.

[0050] In a preferred embodiment, an annular skeleton oil seal 111 is provided in the front cavity 11 of the rotating shaft, and the skeleton oil seal 111 is located on the outer periphery of the rotating shaft 2.

[0051] In a preferred embodiment, the skeleton oil seal 111 is further provided with an elastic retaining ring 112 on the side away from the rear cover 4.

[0052] In this embodiment, an O-ring seal 5 is provided between the rear cover 4 and the pump housing 1.

[0053] In this embodiment, the rear cover 4 and the pump housing 1 are connected by bolts.

[0054] In this embodiment, the outer rotor 132 is an annular structure with an inner groove, and the inner rotor 131 is a shaft with blades. The blades can be embedded in the grooves, and the number of blades is different from the number of grooves, so that the outer rotor 132 can mesh with the inner rotor 131 to realize the circulation of lubricating oil.

[0055] In this embodiment, mounting holes are provided around the perimeter of the housing, and the self-lubricating internal meshing cycloidal lubrication pump of this utility model is mounted on the gearbox by bolts through the holes.

[0056] During operation, the gearbox, driven by the engine, rotates the drive shaft, which in turn rotates the shaft 2 of the self-lubricating internal meshing cycloidal lubrication pump connected to the drive shaft. The inner rotor 131 is connected to the shaft 2 via a pin 133. As the shaft 2 rotates, the inner rotor 131 begins to rotate, and the outer rotor 132 rotates synchronously. At this time, the inner and outer rotors are tightly fitted with the partition 16 and the end face of the rear cover 4, forming a closed working chamber. As the inner rotor 131 and the outer rotor 132 rotate, the lubricating oil entering the low-pressure chamber 14 from the oil inlet 17 is drawn into the rotor chamber 13 under the pressure difference. The meshing motion between the inner rotor 131 and the outer rotor 132 can form a closed volume chamber, which is gradually compressed during rotation, creating a pressure difference. The lubricating oil flows from the rotor chamber 13 to the high-pressure chamber 15. A small portion of the lubricating oil in the high-pressure chamber 15 enters the front chamber 11 of the shaft through the connecting hole 19, then enters the gap between the shaft 2 and the bushing 121 from the front chamber 11, and finally flows back to the low-pressure chamber 14, thus achieving lubrication between the shaft 2 and the bushing 121, extending the service life of the lubrication pump, and improving mechanical efficiency.

[0057] Inside the high-pressure chamber 15, the pressure of the lubricating oil increases, and it is smoothly discharged from the pump through the oil outlet 18, completing the circulation of the lubricating oil.

[0058] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A self-lubricating internal meshing cycloidal lubrication pump, characterized in that, The pump casing includes a pump housing and a rotating shaft. The pump housing has a hexahedral structure, with a positioning boss on one end face and a rear cover connected to the opposite end face. Within the pump housing, between the positioning boss and the rear cover, there are sequentially connected rotating shaft front chambers, a central hole, and a rotor chamber. Each side of the central hole has a kidney-shaped cavity, designated as a low-pressure chamber and a high-pressure chamber, respectively, separated by a partition. The rotating shaft is located at the center of the pump housing and passes through the rotor chamber. 、 The pump housing has a central hole and a front cavity for the rotating shaft, and extends out of the positioning boss. A rotor assembly is provided inside the rotor cavity, and the rotor assembly is arranged around the outer circumference of the rotating shaft. One end face of the rotor assembly near the central hole abuts against the partition, and the other end face of the rotor assembly abuts against the rear cover. The pump housing has an oil inlet and an oil outlet. The oil inlet is connected to the low-pressure chamber, and the oil outlet is connected to the high-pressure chamber. A connecting hole is provided between the high-pressure chamber and the front cavity for the rotating shaft to connect them.

2. The self-lubricating internal meshing cycloidal lubrication pump according to claim 1, characterized in that, The oil inlet is located at the upper end of the pump housing, and the oil outlet is located at the lower end of the pump housing.

3. The self-lubricating internal meshing cycloidal lubrication pump according to claim 1, characterized in that, The hexahedron is a cuboid, wherein one end face and the opposite end face of the pump casing are squares.

4. The self-lubricating internal meshing cycloidal lubrication pump according to any one of claims 1 to 3, characterized in that, The oil inlet and the oil outlet are collinear and are located at the center of the upper and lower end faces of the pump casing, respectively.

5. The self-lubricating internal meshing cycloidal lubrication pump according to claim 1, characterized in that, A bushing is provided between the central hole and the rotating shaft. The bushing is interference-fitted with the central hole and clearance-fitted with the rotating shaft.

6. The self-lubricating internal meshing cycloidal lubrication pump according to claim 1, characterized in that, The rotor assembly includes an annular inner rotor and an outer rotor arranged around the outer periphery of the inner rotor. There is an eccentricity between the axis of the outer rotor and the axis of the inner rotor. The outer rotor meshes with the inner rotor, and the outer periphery of the outer rotor is clearance-fitted with the pump casing.

7. The self-lubricating internal meshing cycloidal lubrication pump according to claim 6, characterized in that, The rotating shaft is connected to the inner rotor via a pin.

8. The self-lubricating internal meshing cycloidal lubrication pump according to claim 1, characterized in that, The front cavity of the rotating shaft is provided with an annular skeleton oil seal, which is located on the outer periphery of the rotating shaft.

9. The self-lubricating internal meshing cycloidal lubrication pump according to claim 8, characterized in that, An elastic retaining ring is also provided on the side of the skeleton oil seal away from the rear cover.

10. The self-lubricating internal meshing cycloidal lubrication pump according to claim 9, characterized in that, An O-ring is provided between the rear cover and the pump housing.

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