Novel swash plate structure of axial plunger pump
By adopting an integrated cast-shaped swash plate structure and high-pressure oil tank design in the axial plunger pump, the wear problems caused by excessive housing pressure and abnormal movement of the sliding shoe are solved, and a longer service life and higher mechanical efficiency are achieved.
Patent Information
- Application Number
- CN202421519991.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-07-01
AI Technical Summary
The existing swash plate axial plunger pumps have increased wear due to excessive housing pressure and abnormal movement of the sliding shoe, which affects the pump efficiency and service life, and there are problems of material waste and assembly complexity.
The special-shaped swash plate structure is adopted with an integrated casting. Through the design of high-pressure oil tank and oil passage, the return plate and sliding boots are always attached to the thrust plate or swash plate during operation, ensuring the establishment of normal oil film and the maintenance of mechanical efficiency.
It effectively reduces the failure rate of sliding boots, extends the service life of the pump, and reduces material waste and assembly complexity.
Smart Images
Figure CN222702085U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a novel swash plate structure of an axial piston pump, belonging to the technical field of piston pumps. Background Art
[0002] The residual clamping force design method is a design method often used in the design of hydraulic friction pairs. Its basic idea is to make the clamping force between the friction pairs slightly greater than the separation force pressure, so that the friction pairs can be in close contact and work under a small specific pressure. However, due to the limitations of manufacturing processes and materials, the matching surfaces between the friction pairs in the rotating body parts of the pump body will face the problem of increasing matching clearances, which will lead to greater internal leakage of high-pressure oil and increased housing pressure.
[0003] The existing swash plate type axial piston pump has abnormal wear due to excessive housing pressure and abnormal movement of the sliding shoe due to the lack of pressing on the thrust plate (or swash plate), which affects the pump's efficiency and shortens its service life. The existing patent "A plunger pump swash plate assembly and plunger pump with dynamic and static characteristics self-feedback" technology has the following shortcomings: a clamping device is used on both the high and low pressure sides of the swash plate, resulting in material waste and increased assembly processes. The high-pressure side of the swash plate is pressed against the swash plate by the high-pressure oil in the plunger chamber, and no additional device is needed. The return plate with magnetic force will adsorb metal impurities in the oil when the pump is running. When the rotating body parts are running, the metal impurities will inevitably scratch the mating surface, which will reduce the mechanical efficiency of the entire pump and increase the internal leakage of the pump housing. Utility Model Content
[0004] In order to overcome the deficiencies of the above-mentioned prior art, the utility model provides a new swash plate structure of an axial piston pump, which can ensure that the slipper and the return plate are always pressed against the thrust plate or the swash plate when they move while ensuring the establishment of a normal oil film and no loss of mechanical efficiency, thereby reducing the failure rate of the slipper and ultimately achieving the service life of the entire pump.
[0005] The utility model is realized through the following technical scheme: a novel swash plate structure of an axial piston pump, comprising an integrally cast special-shaped swash plate structure body, a high-pressure oil groove I is provided at the bottom of the special-shaped swash plate structure body, an oil passage is provided inside the special-shaped swash plate structure body, a high-pressure oil groove II is provided at a clamping structure on the upper side of the special-shaped swash plate structure body, and the high-pressure oil groove I is connected to the high-pressure oil groove II through the oil passage.
[0006] The oil outlet of the high-pressure oil tank II is arranged at the top and side of the clamping structure.
[0007] The special-shaped swash plate structure body is made of QT500-7 ductile iron.
[0008] The special-shaped swash plate structure body is subjected to nitriding heat treatment.
[0009] The beneficial effects of the utility model are as follows: the one-piece casting structure is compact and light in weight, and the high-pressure oil at the bottom of the swash plate is drained to the top of the swash plate to achieve the clamping force compensation effect, that is, the pressure of the high-pressure oil is used to press the return plate and the sliding shoe onto the thrust plate or the swash plate, so as to ensure that the sliding shoe is always tightly attached to the thrust plate when the rotating body parts are in operation, so as to prevent the sliding shoe from being abnormally worn due to abnormal movement and thus reducing its service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The utility model is further described below based on the drawings and embodiments.
[0011] Figure 1 It is a structural schematic diagram of the utility model;
[0012] Figure 2 It is a side view of the utility model;
[0013] Figure 3 It is a top view of the utility model.
[0014] In the figure: 1. Special-shaped swash plate structure body; 2. High-pressure oil tank I; 3. Oil channel; 4. High-pressure oil tank II. DETAILED DESCRIPTION
[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0016] In the description of the present utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0017] like Figures 1 to 3 A new type of swash plate structure of an axial piston pump shown in the figure comprises an integrally cast special-shaped swash plate structure body 1, a high-pressure oil groove Ⅰ2 is provided at the bottom of the special-shaped swash plate structure body 1, an oil passage 3 is provided inside the special-shaped swash plate structure body 1, a high-pressure oil groove Ⅱ4 is provided at the clamping structure on the upper side of the special-shaped swash plate structure body 1, the high-pressure oil groove Ⅰ2 is connected to the high-pressure oil groove Ⅱ4 through the oil passage 3, and then the return plate is pushed onto the thrust plate or the swash plate by the high-pressure oil.
[0018] The oil outlet of the high-pressure oil tank II4 is arranged at the top and side of the clamping structure.
[0019] The material of the special-shaped swash plate structure body 1 is QT500-7 ductile iron.
[0020] The special-shaped swash plate structure body 1 is subjected to nitriding heat treatment.
[0021] The clamping force can be adjusted by changing the flow area of any flow channel or by installing damping holes of different specifications to meet different product requirements.
[0022] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A novel swash plate structure of an axial piston pump, characterized in that: The invention comprises an integrally cast special-shaped swash plate structure body (1), wherein a high-pressure oil groove I (2) is provided at the bottom of the special-shaped swash plate structure body (1), an oil passage (3) is provided inside the special-shaped swash plate structure body (1), a high-pressure oil groove II (4) is provided at a clamping structure on the upper side of the special-shaped swash plate structure body (1), and the high-pressure oil groove I (2) is connected to the high-pressure oil groove II (4) via the oil passage (3).
2. The novel swash plate structure of an axial piston pump according to claim 1 is characterized in that: The oil outlet of the high-pressure oil tank II (4) is arranged at the top and side of the clamping structure.
3. The novel swash plate structure of an axial piston pump according to claim 1 is characterized in that: The material of the special-shaped swash plate structure body (1) is QT500-7 ductile iron.
4. The novel swash plate structure of an axial piston pump according to claim 2 is characterized in that: The special-shaped swash plate structure body (1) is subjected to nitriding heat treatment.