Discontinuous H-shaped static pressure oil groove, friction pair component and hydraulic equipment

Abstract

The invention provides a discontinuous H-shaped static pressure oil groove, a friction pair component and hydraulic equipment, and belongs to the technical field of hydraulic transmission equipment. The static pressure oil groove is in a discontinuous H shape after being unfolded and comprises two longitudinal groove bodies which are both in a semi-arc shape, bent inwards and distributed along the cambered surface of a plunger-roller friction pair. And the transverse groove body is linear, is positioned in the middle of the two longitudinal groove bodies, and is not connected with the two longitudinal groove bodies. Through the discontinuous H-shaped topological structure formed by not connecting the transverse groove bodies and the longitudinal groove bodies, compared with a traditional static pressure oil groove, through independent distributed lubrication, the friction torque can be greatly reduced, the bearing capacity is improved, and the service life of a plunger is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic transmission equipment technology, specifically relating to a discontinuous H-shaped hydrostatic oil groove structure applied to the piston-roller friction pair of a hydraulic motor. Through an innovative "non-through H-shaped" topology design, it achieves uniform coverage of the lubricating oil film across the entire area, making it suitable for medium and high pressure hydraulic motor friction pair systems, especially meeting the requirements of high load, low friction, and long service life. Background Technology

[0002] The hydrostatic groove is a key structure determining the load-bearing, lubrication, and wear performance of a friction pair. This structure provides necessary hydrostatic support for the friction pair, alleviating the contact pressure from local micro-protrusions at the interface. Simultaneously, the hydrostatic groove facilitates lubricant film formation and heat dissipation, thereby reducing friction and improving wear performance. Existing hydrostatic groove structures are mostly circular, and their design relies heavily on the designer's experience, making it difficult to achieve a globally optimal configuration. Therefore, designing a hydrostatic groove with high load-bearing capacity that can satisfy a globally optimal solution constitutes the technical problem this invention aims to solve. Summary of the Invention

[0003] In view of this, in order to obtain a hydrostatic oil groove with high load-bearing capacity and that can satisfy the global optimal solution, the present invention provides a discontinuous H-shaped hydrostatic oil groove, friction pair components and hydraulic equipment. The discontinuous H-shaped topology formed by the non-connection of the transverse groove and the longitudinal groove can significantly reduce friction torque, increase load-bearing capacity and extend plunger life compared with traditional hydrostatic oil grooves through independent distributed lubrication.

[0004] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, the present invention provides a discontinuous H-shaped hydrostatic oil groove for a hydraulic motor plunger-roller friction pair, wherein the unfolded shape of the hydrostatic oil groove is discontinuous H-shaped, comprising: Both longitudinal grooves are curved inward in a semi-circular shape and distributed along the arc surface of the plunger-roller friction pair; A transverse groove, in the shape of a straight line, is located in the middle of the two longitudinal grooves and is not connected to the two longitudinal grooves. It is preferably located on the transverse axis of the entire pattern, and more preferably 3-6 mm away from the center of the two longitudinal grooves.

[0005] Secondly, the present invention provides a friction pair component comprising the discontinuous H-shaped hydrostatic oil groove of the aforementioned hydraulic motor plunger-roller friction pair.

[0006] Thirdly, the present invention also provides a hydraulic device comprising the aforementioned friction pair components.

[0007] Compared with the prior art, the present invention has the following beneficial effects: (1) Significantly reduced frictional torque: The transverse groove is independent of the longitudinal groove, avoiding eddy current loss caused by the intersection of continuous H-shaped oil grooves, reducing the flow resistance of lubricating oil, and significantly reducing frictional torque compared to traditional hydrostatic oil grooves.

[0008] (2) Significantly improved load-bearing capacity: The longitudinal and transverse grooves work together to form a full-area oil film coverage of "lubrication on both sides and independent lubrication in the middle". The oil film coverage area is expanded, the contact pressure on the friction pair surface is reduced, and the load-bearing capacity is significantly improved.

[0009] (3) The plunger life is significantly extended: the low friction characteristics reduce wear, the stable oil film in the whole area avoids local dry friction, and the rounded corner treatment of the inner surface of the groove reduces stress concentration, thus greatly extending the plunger contact fatigue life.

[0010] (4) Optimized anti-leakage performance: The horizontal tank and the vertical tank are kept 3-6mm apart to avoid discontinuity and inconspicuous leakage when they are too close, and leakage when they are too far apart. It takes into account both "discontinuity" and sealing performance, and the leakage is reduced compared with the continuous H-shaped oil tank.

[0011] (5) Better lubricant distribution: The discontinuous configuration optimized by this invention, combined with the gradual change of the longitudinal groove "narrow in the middle and wide at both ends" and the equal width design of the transverse groove, achieves precise distribution of lubricant at the edge and middle of the friction pair, avoiding local over- or under-lubrication.

[0012] In summary, this invention, through a "discontinuous H-shaped" topology design, overcomes the limitations of the traditional "through-flow channel" hydrostatic oil tank, achieving independent oil supply and synergistic lubrication between the longitudinal and transverse tanks. This significantly reduces frictional torque, increases load-bearing capacity, and extends service life. Its innovations lie in: the non-through structure avoiding pressure interference, the gradually varying tank width enhancing edge lubrication, and precise distance control optimizing leakage and eddy currents, providing an efficient and reliable lubrication solution for hydraulic motor friction pair systems. Attached Figure Description

[0013] Figure 1 This is a schematic diagram showing the unfolded shape of the discontinuous H-shaped hydrostatic oil groove of the hydraulic motor plunger-roller friction pair of the present invention. Figure 2 This is the front view of the discontinuous H-shaped hydrostatic oil groove on the curved surface of the hydraulic motor plunger-roller friction pair; Figure 3 This is an isometric view of the discontinuous H-shaped hydrostatic oil groove on the curved surface of the hydraulic motor plunger-roller friction pair; Figure 4 This is a schematic diagram of a traditional hydrostatic oil tank. Figure 5 A comparison of the simulated surface contact force of the discontinuous H-shaped hydrostatic oil tank and the traditional hydrostatic oil tank under the same load is shown. The left side shows the simulated contact force of the H-shaped hydrostatic oil tank of the present invention, while the right side shows the simulated contact force of the traditional hydrostatic oil tank. Figure 6 The graphs show the changes in frictional torque between the H-shaped hydrostatic oil tank and the traditional hydrostatic oil tank under varying torque and speed; where (a) is the pressure variation graph and (b) is the frictional torque variation graph.

[0014] In the figure, 1 is the first longitudinal channel; 2 is the second longitudinal channel; and 3 is the transverse channel. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0016] In the description of this invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom", 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 invention 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 invention.

[0017] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" 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 an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0018] like Figure 1-3 As shown, the present invention provides a discontinuous H-shaped hydrostatic oil groove for a hydraulic motor plunger-roller friction pair. The unfolded shape of the hydrostatic oil groove is discontinuous H-shaped, comprising: The two longitudinal grooves (first longitudinal groove 1 and second longitudinal groove 2) are both curved inward in a semi-circular shape, distributed along the arc surface of the plunger-roller friction pair. The outer edges of the two longitudinal grooves are always equidistant from the outer side of the plunger-roller friction pair, preferably at a distance of 3-6 mm, ensuring uniform coverage of the friction area with lubricating oil film and maximizing coverage. The semi-circular longitudinal grooves adapt to the arc surface contact characteristics of the friction pair, and combined with the 3-6 mm equidistant outer edge design, the lubricating oil film coverage area is significantly increased compared to traditional circular oil grooves, avoiding dry friction in the edge areas.

[0019] A transverse groove 3, in a straight line, is located in the middle of the two longitudinal grooves and is not connected to the two longitudinal grooves. It is preferably located on the transverse axis of the entire pattern, and more preferably 3-6 mm away from the center of the two longitudinal grooves.

[0020] In this invention, the discontinuous H-shaped hydrostatic oil tank formed by two longitudinal grooves and one transverse groove 3 avoids the problems associated with traditional hydrostatic oil tanks (such as...). Figure 4 (As shown) The eddy current loss caused by the flow channel intersection reduces the lubricating oil flow resistance and the friction torque is lower than that of a traditional circular hydrostatic oil groove (such as...). Figure 4 (As shown) decreased significantly.

[0021] In this invention, the longitudinal grooves are semi-circular and curved inwards. The two longitudinal grooves exhibit a narrower middle and gradually wider ends, guiding the lubricating oil towards the edge of the friction pair. The semi-circular shape adapts to the curved surface of the friction pair, and the equidistant design ensures that the oil film covers the contact area. The gradually changing width guides the lubricating oil towards the edge, avoiding localized wear caused by insufficient lubrication in the edge area. Combined with the independent lubrication of the central area by the three transverse grooves, the overall oil film coverage area is significantly increased, and the load-bearing capacity is significantly improved. The equidistant positioning of 3-6mm along the outer edge ensures that the lubricating oil film coverage area precisely matches the actual contact area of ​​the friction pair, further increasing the load-bearing area.

[0022] The two longitudinal grooves are symmetrical about the longitudinal and transverse central axes of the unfolded plane, which is used for balanced pressure distribution. The symmetrical structure ensures that the flow rate of the two longitudinal grooves is consistent, and the transverse groove 3 independently supplies oil to the central area of ​​the friction pair, supplementing the traditional circular hydrostatic oil groove. Figure 4 The deficiency of insufficient oil film in the middle is addressed by creating a full-area coverage of "thick oil films on both sides + an independent oil film in the middle," resulting in a smaller oil film pressure fluctuation compared to traditional hydrostatic oil tanks (such as...). Figure 4 (As shown) a significant decrease.

[0023] The transverse groove 3 has a uniform width, preferably 2-4 mm. The width-to-depth ratio of the discontinuous H-shaped hydrostatic oil groove ranges from 0.5 to 0.8. The width-to-width ratio of the transverse groove 3 to the longitudinal groove ranges from 0.6 to 0.8. All inner surface corners of the discontinuous H-shaped hydrostatic oil groove are rounded, preferably with a radius of not less than 0.5 mm. The width ratio and width-to-depth ratio work together to balance flow distribution and avoid excessive local pressure; the 3-6 mm spacing design balances "discontinuity" and sealing performance, significantly reducing leakage compared to traditional hydrostatic oil grooves; the rounded corners reduce stress concentration and significantly extend the plunger contact fatigue life. The rounded corners of all inner surface corners reduce eddy current losses during lubricant flow, reduce pressure loss, and improve the oil film establishment speed. The groove configuration optimized by the self-evolution algorithm can adaptively adjust the lubricating oil flow according to the force distribution of the friction pair, and achieve a dynamic balance of "more oil supply in high pressure area and less oil supply in low pressure area", avoiding local over- or under-lubrication caused by traditional experience design.

[0024] The working principle of the discontinuous H-shaped hydrostatic oil groove of this invention is based on the innovative design of "independent distributed lubrication + precise flow field control". Through the synergistic effect of the transverse and longitudinal grooves, it achieves full-area oil film coverage and low-friction operation of the friction pair. The specific process is as follows: High-pressure lubricating oil is injected into the first longitudinal groove 1, the second longitudinal groove 2, and the transverse groove 3 through independent oil supply holes. The longitudinal grooves utilize a gradually changing width design to guide the lubricating oil to the edge of the friction pair under the action of pressure difference. Its semi-circular contour fits the arc surface of the friction pair, and the equidistant design of 3-6mm on the outer edge ensures that the oil film covers the contact area on both sides, forming an edge oil film and avoiding dry friction. The transverse groove 3 independently supplies oil to the middle area of ​​the friction pair, maintaining a distance of 3-6mm from the longitudinal groove. It supplements the deficiency of insufficient oil film in the middle of the traditional continuous groove through the diffusion of surface lubricating oil, forming full coverage of "thick oil film on both sides + independent oil film in the middle".

[0025] In summary, the core innovation of this invention lies in the fact that the transverse and longitudinal channels are not directly connected, thus avoiding eddy current losses and pressure interference caused by flow channel intersections. The oil film pressure fluctuation amplitude is significantly reduced compared to traditional continuous channels. At the same time, through self-evolutionary design and optimized channel parameters, dynamic flow balance is achieved. Combined with rounded corner treatment to reduce flow resistance, the invention ultimately achieves a comprehensive effect of significantly reducing friction torque, improving load-bearing capacity, and extending plunger life.

[0026] The discontinuous H-shaped hydrostatic oil groove of this invention is optimized through a self-evolutionary design method. Its configuration provides superior lubricating oil distribution characteristics and load-bearing capacity compared to conventionally shaped hydrostatic oil grooves. Simulation comparisons of the discontinuous H-shaped hydrostatic oil groove and the conventional hydrostatic oil groove under the same load are shown below. Figure 5As shown in the figure, the surface contact force of the new oil tank is superior to that of the traditional oil tank. The comparison diagram of contact force and frictional torque between the traditional circular oil tank and the new discontinuous H-shaped hydrostatic oil tank under varying pressure and velocity is shown in the figure. Figure 6 As shown, the new H-type oil tank exhibits lower frictional torque and contact force under different speeds and static pressures, resulting in a longer service life.

[0027] The above description is merely a preferred embodiment of the present invention. However, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention should be covered within the scope of protection of the present invention.

Claims

1. A discontinuous H-shaped hydrostatic oil groove for a hydraulic motor plunger-roller friction pair, characterized in that, The hydrostatic oil tank has a discontinuous H-shaped unfolded shape, including: Both longitudinal grooves are curved inward in a semi-circular shape and distributed along the arc surface of the plunger-roller friction pair; A transverse groove, in the shape of a straight line, is located in the middle of the two longitudinal grooves and is not connected to the two longitudinal grooves. It is preferably located on the transverse axis of the entire pattern, and more preferably 3-6 mm away from the center of the two longitudinal grooves.

2. The discontinuous H-shaped hydrostatic oil groove of the hydraulic motor plunger-roller friction pair according to claim 1, characterized in that, The outer edges of the two longitudinal grooves are always equidistant from the outer side of the plunger-roller friction pair, preferably 3-6 mm.

3. The discontinuous H-shaped hydrostatic oil groove of the hydraulic motor plunger-roller friction pair according to claim 1, characterized in that, The two longitudinal grooves exhibit a trend of being narrow in the middle and gradually widening at both ends.

4. The discontinuous H-shaped hydrostatic oil groove of the hydraulic motor plunger-roller friction pair according to claim 1, characterized in that, The two longitudinal grooves are symmetrical about the longitudinal and transverse central axes of the unfolded plane.

5. The discontinuous H-shaped hydrostatic oil groove of the hydraulic motor plunger-roller friction pair according to claim 1, characterized in that, The transverse grooves are of equal width, preferably 2-4 mm.

6. The discontinuous H-shaped hydrostatic oil groove of the hydraulic motor plunger-roller friction pair according to claim 1, characterized in that, The width-to-depth ratio of the discontinuous H-shaped hydrostatic oil groove is in the range of 0.5-0.

8.

7. The discontinuous H-shaped hydrostatic oil groove of the hydraulic motor plunger-roller friction pair according to claim 1, characterized in that, All inner surface corners of the H-shaped hydrostatic oil groove are rounded, preferably with a radius of not less than 0.5 mm.

8. The discontinuous H-shaped hydrostatic oil groove of the hydraulic motor plunger-roller friction pair according to any one of claims 1-7, characterized in that, The ratio of the width of the transverse groove to the width of the longitudinal groove is in the range of 0.6-0.

8.

9. A friction pair component, characterized in that, The hydraulic motor plunger-roller friction pair includes a discontinuous H-shaped hydrostatic oil groove as described in any one of claims 1-8.

10. A hydraulic device, characterized in that, It includes the friction pair component as described in claim 9.

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