Hydraulic vane motor with leakage structure

Abstract

The utility model relates to a hydraulic vane motor with a leakage structure, which comprises a machine cover, a rotating shaft, a rotor, vanes, a stator, a front valve plate and a rear valve plate, the machine cover comprises a front machine cover and a rear machine cover, and the hydraulic vane motor is mainly characterized in that the joint of the front machine cover and the rear machine cover is arranged on the circumferential surface of an inner cavity formed by the front valve plate and the rear valve plate; the rear end of the rotating shaft is connected with a sliding bearing or a sliding sleeve in a sleeved mode and located with a shaft hole in the rear valve plate, an oil drainage groove is formed in the shaft hole of the rear valve plate in the radial direction, and an oil drainage hole communicated with the shaft hole of the rear valve plate is formed in the rear machine cover. High-pressure oil leaked from the inner cavities of the front valve plate and the rear valve plate enters the oil drainage hole through the oil drainage groove and the shaft hole of the rear valve plate to form oil drainage. According to the structure, various complex problems caused by random leakage of hydraulic oil due to uncontrollable leakage points of the hydraulic oil are avoided, the use is more controllable, safer and more reliable, and the durability of the motor is improved.

Description

Technical Field

[0001] The utility model relates to the field of motors and is a hydraulic vane motor with an external leakage structure. Background Art

[0002] Traditional hydraulic vane motors suffer from significant leakage issues in practical applications. While a seal is installed between the output shaft and the end cap of the hydraulic vane motor, the shaft and seal experience relative motion during rotation. Furthermore, under high-pressure conditions, the hydraulic oil exerts significant pressure on the seal, which can easily lead to seal wear and deformation, causing hydraulic oil to leak from the seal into the external environment. Furthermore, despite the use of sealing gaskets at the interface between the end cap and the housing, long-term operation degrades the sealing performance due to equipment vibration, temperature fluctuations, and gasket aging, allowing hydraulic oil to leak from this interface. Furthermore, clearances exist within the hydraulic vane motor between the vanes and the stator, rotor, and valve plate and related components. Under high pressure, hydraulic oil can penetrate these clearances to external areas, causing leakage, and leakage becomes more severe as components wear.

[0003] Leakage issues with hydraulic vane motors have numerous negative consequences. Hydraulic oil not only affects the surrounding environment but also has lubricating and flammable properties. Leakage onto the ground or equipment surfaces increases personnel safety risks, especially near sources of ignition or high heat, potentially causing fires or explosions. Furthermore, leakage leads to loss of hydraulic oil in the hydraulic system, destabilizing system operating pressure, affecting the proper functioning of the hydraulic vane motor, reducing output power and efficiency, and increasing equipment maintenance costs and downtime.

[0004] Existing control measures for hydraulic vane motor leakage have limitations. For example, the utility model application number 201922159468.6, published in the Chinese patent literature and published on July 17, 2020, is titled "A Dual-Vane Hydraulic Servo Swing Motor." While the improved shaft seal design of this product can alleviate leakage at the seal, it remains difficult to completely resolve the problem under complex operating conditions. Strengthening the seal at the interface between the end cover and the housing will still cause fluctuations in sealing effectiveness during long-term operation. The clearance between the control components also struggles to maintain its initial set value due to wear, and leakage remains a prominent issue. Therefore, improvements to hydraulic vane motors, particularly leakage mechanisms, are needed. Summary of the Invention

[0005] To overcome the aforementioned shortcomings, the present invention aims to provide a hydraulic vane motor with an external leakage mechanism. This mechanism addresses the technical problem that existing similar products, due to inevitable gaps, vibrations, and wear during long-term operation, still suffer from uncontrollable leakage and are unable to effectively address the negative impacts of leakage. This objective is achieved through the following technical solution.

[0006] A hydraulic vane motor with an external leakage structure, the hydraulic vane motor includes a machine cover, a rotating shaft, a rotor, blades, a stator, a front distribution plate, and a rear distribution plate. An inner cavity is formed between the front distribution plate and the rear distribution plate. The stator, rotor, and blades are arranged in the inner cavity. The rotor is connected to the rotating shaft. The rotating shaft is rotated and positioned at the front distribution plate, the rear distribution plate, and the front machine cover, and the front end extends out of the front machine cover as an output end. The machine cover includes a front machine cover and a rear machine cover. A high-pressure oil outlet channel is formed between the front distribution plate and the front machine cover, and a high-pressure oil inlet channel is formed between the rear distribution plate and the rear machine cover. The key structural features of the invention are that the junction of the front and rear covers is located on the circumferential surface of the inner cavity formed by the front and rear valve discs, and a sealing spacer is provided at the junction. The rear end of the rotating shaft is sleeved with a sliding bearing and positioned in the axial hole of the rear valve disc. The axial hole of the rear valve disc is radially provided with an oil drain groove. The rear cover is provided with an oil drain hole that is connected to the axial hole of the rear valve disc. High-pressure oil leaking from the inner cavity of the front and rear valve discs enters the oil drain hole through the oil drain groove and the axial hole of the rear valve disc to drain. The above structure essentially transforms the existing uncontrollable hydraulic oil leakage into a controllable leakage. By utilizing the elastic properties of the sealing spacer between the front and rear covers and the oil drain channel formed by the oil drain groove and oil drain hole, the hydraulic vane motor will leak hydraulic oil along the oil drain channel under conditions such as clearance, vibration, and wear. This avoids the various complex problems caused by uncontrollable hydraulic oil leakage points and random hydraulic oil leakage, making it more controllable, safer, and more reliable. In addition, when the high-pressure oil area of the hydraulic vane motor leaks, the leaked high-pressure oil is discharged through the leakage hole to maintain the internal pressure stable, effectively solving the problem of high-pressure oil leakage in traditional hydraulic vane motors damaging the oil seals, while enhancing the heat dissipation of the hydraulic oil inside the hydraulic vane motor and improving the durability of the motor.

[0007] The vanes are spring-loaded, meaning springs are placed in the vane slots where the vanes mate with the rotor. This structure effectively compensates for gaps between the vanes and the stator, maintaining sealing performance and ensuring a good seal during pump operation, reducing hydraulic oil leakage and improving the pump's volumetric efficiency. It also adapts to wear and tear by continuously providing sufficient pressure to keep the vanes and stator in close contact, extending the vane pump's service life. Furthermore, it provides cushioning and shock absorption, reducing impacts. The hydraulic system may experience pressure fluctuations or instantaneous impact loads, and the spring vanes act as a buffer, preventing the vanes from breaking or damaging due to instantaneous stress concentration, reducing vibration and noise. The spring vanes' elasticity reduces vibration of the vanes on the inner surface of the stator, thereby reducing vibration and noise and extending the pump's service life.

[0008] The rotor's inner bore is equipped with internal involute splines, and the shaft is equipped with external involute splines that mate with the internal involute splines, creating a uniform gap between the rotor and the shaft. This structure ensures stable rotor operation while also forming a hydraulic oil channel between the rotor and the shaft. Hydraulic oil leaking between the front valve plate and the rotor can flow through this gap into the oil drain groove and oil drain hole, achieving controllable oil leakage.

[0009] The rotating shaft and the front cover are rotated and positioned by an angular contact bearing in conjunction with a shaft circlip and a hole circlip. This structure ensures the stability of the rotating shaft relative to the front cover and meets the high speed requirements of the hydraulic vane motor.

[0010] A transition ring is installed between the end of the front valve plate and the inner hole of the front hood. A sealing groove is provided on the outer diameter of the end of the front valve plate, and an oil-resistant sealing inner ring is installed in the sealing groove to form a seal with the transition ring. The outer diameter surface of the transition ring is provided with an annular groove, and an oil-resistant sealing outer ring is installed to form a seal with the inner hole of the front hood. The high-pressure oil outlet channel is sealed and isolated from the rotating shaft of the inner hole of the front hood through the transition ring, the oil-resistant sealing inner ring, and the oil-resistant sealing outer ring. This structure prevents oil from the high-pressure oil outlet channel from leaking into the inner hole of the front hood.

[0011] An oil-resistant sealing ring forms a seal between the rear valve plate and the inner hole of the rear bonnet, effectively sealing the high-pressure oil inlet passage and the rear bonnet oil drain hole. This structure prevents oil from the high-pressure oil inlet passage from leaking into the rear bonnet's shaft hole. However, if leakage does occur, it can be drained through the oil drain hole, reducing the risk and impact of leakage.

[0012] The end face where the oil drain hole of the rear engine cover is located is a flange end and is connected to an external leakage pipeline with a flange end. Through this structure, it is convenient to connect the rear engine cover to the leakage pipeline.

[0013] The oil drain hole of the rear engine cover is provided with an internal thread and is threadedly connected to the external leakage pipeline. Through this structure, the rear engine cover is also conveniently connected to the external leakage pipeline.

[0014] An oil guide groove is provided in the inner hole of the sliding bearing. Through this structure, leaked hydraulic oil can also lubricate and cool the sliding bearing or the rotating shaft in the slideway, reduce wear and tear, and extend service life.

[0015] The sliding bearing is replaced by a sliding sleeve. Through this structure, the same function as the sliding bearing is achieved.

[0016] The overall structure of the utility model is relatively reasonable, and a controllable leakage is adopted to replace the existing uncontrollable leakage, thereby avoiding various adverse effects caused by the uncontrollable leakage of the pressure relief oil. It is more environmentally friendly, safe, reliable and stable to use, and effectively improves the service life of the product. It is suitable for use as a hydraulic vane motor or a structural improvement of similar products. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the internal sectional structure of the present utility model.

[0018] Figure 2 yes Figure 1 Schematic diagram of the external side structure.

[0019] Figure 3 yes Figure 1 Schematic diagram of the bottom structure.

[0020] The serial numbers and names in the figure are: 1. Front engine cover, 101. High-pressure oil outlet channel, 2. Rear engine cover, 201. High-pressure oil inlet channel, 202. Oil drain hole, 3. Front distribution plate, 4. Rear distribution plate, 401. Oil drain groove, 5. Sealing spacer, 6. Stator, 7. Rotor, 8. Blade, 9. Rotating shaft, 10. Angular contact bearing, 11. Elastic circlip for shaft, 12. Elastic circlip for hole, 13. Transition ring, 14. Oil-resistant sealing inner ring, 15. Oil-resistant sealing outer ring, 16. Sleeve. Implementation Method

[0021] The present invention will now be further described with reference to the accompanying drawings.

[0022] like Figure 1-Figure 3 As shown, the hydraulic vane motor with an external leakage structure includes a housing, a rotating shaft 9, a rotor 7, blades 8, a stator 6, a front valve plate 3, and a rear valve plate 4. An inner cavity is formed between the front and rear valve plates 3 and 4, within which the stator 6, rotor 7, and blades 8 are located. The rotor 7 is connected to the rotating shaft 9, which is rotatably positioned between the front and rear valve plates 3 and 4, and the front housing 1, with the front end extending out of the front housing 1 as the output terminal. The housing includes a front housing 1 and a rear housing 2. A high-pressure oil outlet channel 101 is formed between the front valve plate 3 and the front housing 1, and a high-pressure oil inlet channel is formed between the rear valve plate 4 and the rear housing 2. Accordingly, the rear valve plate 4 has an oil inlet, and the front valve plate 3 has a liquid outlet.

[0023] A transition ring 13 is provided between the end of the above-mentioned front distribution plate 3 and the inner hole of the front engine cover 1. A sealing groove is provided on the outer diameter of the end of the front distribution plate 3, and an oil-resistant sealing inner ring 14 is provided in the sealing groove to form a seal with the transition ring 13. An annular groove is provided on the outer diameter surface of the transition ring 13, and an oil-resistant sealing outer ring 15 is provided to form a seal with the inner hole of the front engine cover 1. The high-pressure oil outlet channel 101 is sealed and isolated from the rotating shaft 9 of the inner hole of the front engine cover 1 through the transition ring 13, the oil-resistant sealing inner ring 14 and the oil-resistant sealing outer ring 15.

[0024] The junction of the front and rear bonnets 1 and 2 is located on the circumferential surface of the inner cavity formed by the front and rear valve plate 3 and 4, and is equipped with a sealing spacer 5. The rear end of the rotating shaft 9 is sleeved with a sliding bearing or sleeve 16 and positioned with the axial hole in the rear valve plate 4. The axial hole of the rear valve plate 4 is radially provided with an oil drain groove 401. The rear bonnet 2 is provided with an oil drain hole 202 that communicates with the axial hole of the rear valve plate 4. High-pressure oil leaking from the inner cavities of the front and rear valve plates 3 and 4 enters the oil drain hole 202 through the oil drain groove 401 and the axial hole of the rear valve plate 4, thereby draining the oil. Furthermore, an oil guide groove is provided in the inner hole of the sliding bearing or sleeve 16 to effectively lubricate the rotating shaft 9 in the event of hydraulic oil leakage.

[0025] An oil-resistant sealing ring forms a seal between the rear valve plate 4 and the inner hole of the rear bonnet 2, specifically between the high-pressure oil inlet passage 201 and the oil drain hole 202 of the rear bonnet 2. This oil-resistant sealing ring, along with the aforementioned oil-resistant inner and outer rings 14 and 15, is made of an oil-resistant rubber material with a Shore hardness of 70 to 80, ensuring excellent sealing performance while maintaining elasticity and sealing effectiveness even under long-term contact with hydraulic oil.

[0026] The blades 8 in the inner cavity formed by the front distribution plate 3 and the rear distribution plate 4 are spring blades, that is, a spring is provided in the blade groove where the blade 8 cooperates with the rotor 7 .

[0027] The inner bore of the rotor 7 is provided with an internal involute spline, and the rotating shaft 9 is provided with an external involute spline that mates with the internal involute spline, creating a uniform gap between the rotor 7 and the rotating shaft 9. The rotating shaft 9 and the front hood 1 are rotationally positioned via an angular contact bearing 10, coupled with a shaft circlip 11 and a bore circlip 12. Specifically, the rotating shaft 9 is provided with a shoulder that abuts against one end of the inner ring of the angular contact bearing 10. The other end of the inner ring is secured to the rotating shaft 9 via the shaft circlip 11, forming a tight stop. The inner bore of the front hood 1 forms a bearing seat that mates with the outer ring of the angular contact bearing 10 and limits one end of the outer ring. The other end of the outer ring is secured to the inner bore of the front hood 1 via the bore circlip 12, forming a tight stop.

[0028] The oil drain hole 202 of the rear cover 2 is flanged and connected to an external flanged drain line. Alternatively, the oil drain hole 202 of the rear cover 2 can be internally threaded for threaded connection to the drain line. Both of these options allow for connection to the drain line, facilitating oil drain operations. The drain line's caliber is determined based on the hydraulic vane motor's rated flow rate and allowable leakage to ensure smooth return of leaked hydraulic oil.

[0029] The hydraulic vane motor operates as follows: oil enters through the high-pressure oil inlet channel 201 and is discharged through the high-pressure oil outlet channel 101. This oil drives the vanes 8 and rotor 7, which in turn drives the shaft 9, achieving power output. If leakage occurs between the front and rear valve plates 3 and 4, and the rotor 7, the high-pressure oil flows through the gap into the shaft 9, then along the oil drain groove 401 in the axial hole of the rear valve plate 4 and into the oil drain hole 202. This oil is then drained out through the external drain line connected to the oil drain hole 202, minimizing the accumulation of high-pressure oil inside the motor and its potential adverse effects on other components.

[0030] The above content is intended to illustrate the technical means of the present invention and is not intended to limit the technical scope of the present invention. Those skilled in the art who, in combination with existing common knowledge, make obvious improvements or substitutions to the present invention also fall within the scope of protection of the claims of the present invention.

Claims

1. A hydraulic vane motor with an external leakage structure, the hydraulic vane motor comprising a machine cover, a rotating shaft (9), a rotor (7), a blade (8), a stator (6), a front distribution plate (3), and a rear distribution plate (4); an inner cavity is formed between the front distribution plate (3) and the rear distribution plate (4); a stator (6), a rotor (7), and a blade (8) are arranged in the inner cavity; the rotor (7) is connected to the rotating shaft (9); the rotating shaft (9) is rotatably positioned at the front distribution plate (3), the rear distribution plate (4), and the front machine cover (1), and the front end extends out of the front machine cover (1) as an output end; the machine cover comprises a front machine cover (1) and a rear machine cover (2); a high-pressure oil outlet channel (101) is formed between the front distribution plate (3) and the front machine cover (1), and a high-pressure oil inlet channel is formed between the rear distribution plate (4) and the rear machine cover (2); it is characterized in that The junction of the front engine cover (1) and the rear engine cover (2) is arranged on the circumference of the inner cavity formed by the front distribution disc (3) and the rear distribution disc (4), and a sealing isolation member (5) is provided at the junction. The rear end of the rotating shaft (9) is sleeved with a sliding bearing and positioned with the shaft hole in the rear distribution disc (4). The shaft hole of the rear distribution disc (4) is radially provided with an oil drain groove (401). The rear engine cover (2) is provided with an oil drain hole (202) arranged in communication with the shaft hole of the rear distribution disc (4). High-pressure oil leaked from the inner cavity of the front distribution disc (3) and the rear distribution disc (4) enters the oil drain hole (202) through the oil drain groove (401) and the shaft hole of the rear distribution disc (4) to form oil drain.

2. The hydraulic vane motor with an external leakage structure according to claim 1, characterized in that The blade (8) is a spring blade, that is, a spring is provided in a blade groove where the blade (8) cooperates with the rotor (7).

3. The hydraulic vane motor with an external leakage structure according to claim 1, characterized in that The inner hole of the rotor (7) is provided with an inner involute spline, and the rotating shaft (9) is provided with an outer involute spline that cooperates with the inner involute spline, so that a uniform gap is formed between the rotor (7) and the rotating shaft (9).

4. The hydraulic vane motor with an external leakage structure according to claim 1, characterized in that The rotating shaft (9) and the front cover (1) are rotated and positioned by an angular contact bearing (10) in conjunction with a shaft elastic retaining ring (11) and a hole elastic retaining ring (12).

5. The hydraulic vane motor with an external leakage structure according to claim 1, characterized in that A transition ring (13) is provided between the end of the front distribution disc (3) and the inner hole of the front engine cover (1); a sealing groove is provided on the outer diameter of the end of the front distribution disc (3); an oil-resistant sealing inner ring (14) is provided in the sealing groove to form a seal with the transition ring (13); an annular groove is provided on the outer diameter surface of the transition ring (13), and an oil-resistant sealing outer ring (15) is provided to form a seal with the inner hole of the front engine cover (1); the high-pressure oil outlet channel (101) is sealed and isolated from the rotating shaft (9) of the inner hole of the front engine cover (1) through the transition ring (13), the oil-resistant sealing inner ring (14) and the oil-resistant sealing outer ring (15).

6. The hydraulic vane motor with an external leakage structure according to claim 1, characterized in that A seal is formed between the rear distribution plate (4) and the inner hole of the rear engine cover (2) via an oil-resistant sealing ring, that is, a seal is formed between the high-pressure oil inlet channel (201) and the oil drain hole (202) of the rear engine cover (2).

7. The hydraulic vane motor with an external leakage structure according to claim 1, characterized in that The end surface of the oil drain hole (202) of the rear engine cover (2) is a flange end, and is connected to an external leakage pipeline with a flange end.

8. The hydraulic vane motor with an external leakage structure according to claim 1, characterized in that The oil drain hole (202) of the rear engine cover (2) is provided with an internal thread and is threadedly connected to the external drain pipeline.

9. The hydraulic vane motor with an external leakage structure according to claim 1, characterized in that An oil guide groove is provided in the inner hole of the sliding bearing.

10. The hydraulic vane motor with an external leakage structure according to claim 9, characterized in that The sliding bearing is replaced by a sliding sleeve (16).

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