A constant power regulation integrated hydraulic pump

Abstract

The present invention relates to the technical field of plunger pumps, and more particularly, to a constant power regulation integrated hydraulic pump. The hydraulic pump includes a pump main body assembly and a regulation assembly. The pump main body assembly includes a housing having an oil outlet and a control oil chamber, and a swash plate rotatably disposed in the housing; the displacement angle of the swash plate is positively correlated with the flow rate of the oil outlet and negatively correlated with the oil pressure of the control oil chamber. The regulation assembly includes a valve sleeve unit, a valve core unit, and an elastic unit; the valve sleeve body of the valve sleeve unit is detachably connected to the housing; the valve core unit is slidably disposed in a coaxial shaft hole in the valve sleeve body. The valve sleeve body is provided with a first oil port and a second oil port respectively communicating with the shaft hole; the first oil port communicates with the oil outlet; the second oil port communicates with the control oil chamber; the pressure relief oil port communicates with the inner cavity of the housing. The valve core unit, the elastic unit, and the swash plate in the inner cavity of the housing are sequentially detachably connected; the elastic unit applies a damping force to the valve core unit. Thereby solving the problems of large volume and heavy weight of the constant power hydraulic pump.

Description

Technical Field

[0001] The present invention relates to the technical field of plunger pumps, and more particularly to a constant power regulation integrated hydraulic pump. Background Art

[0002] The constant power regulation technology is the core support of modern aircraft hydraulic systems, and its importance is mainly reflected in safety guarantee under extreme working conditions, energy efficiency optimization in complex environments, and support for the upgrading of aviation technology. For example, first, when the main hydraulic source fails, the emergency constant power pump ensures stable power output of the emergency control surface through power closed-loop control. In a multi-redundancy system, constant power regulation can achieve dynamic load distribution. Second, during high-altitude low temperature or severe maneuvering, constant power regulation controls through pressure-flow coupling, such as an electro-hydraulic proportional valve to correct the swashplate angle in real time, avoiding power fluctuations caused by changes in oil viscosity or sudden load changes. During the cruise phase, when the system load decreases, the constant power pump automatically switches to the "idle" mode to reduce engine power consumption. Third, as the hydraulic system evolves towards 55 MPa high pressure and all-electric drive, the constant power regulation technology becomes the core means to achieve stable power under high pressure and motor overload protection.

[0003] Hydraulic pumps in aircraft hydraulic systems, such as flight control system hydraulic pumps, engine-driven pumps, auxiliary power unit hydraulic pumps, and special function hydraulic pumps (such as fuel boost pumps, environmental control system pumps), all have the function of constant power regulation. However, the current constant power regulation technology relies on complex mechanical linkage devices and hydraulic control valve groups. For example, the constant power control of traditional axial piston pumps requires the integration of pressure sensors, electro-hydraulic proportional valves, and mechanical feedback mechanisms, resulting in an increase in the volume and weight of the hydraulic pump, and increasing aircraft energy consumption. Summary of the Invention

[0004] To solve the problems of large volume and heavy weight of constant power hydraulic pumps, the present invention provides a constant power regulation integrated hydraulic pump, comprising:

[0005] A pump main body assembly, the pump main body assembly includes a housing and a swashplate, the housing has an oil outlet and a control oil chamber; the swashplate is rotatably arranged in the housing; the flow rate of the oil outlet is positively correlated with the displacement angle of the swashplate; the displacement angle of the swashplate is negatively correlated with the oil pressure in the control oil chamber;

[0006] Adjusting assembly, the adjusting assembly includes a valve sleeve unit, a valve core unit and an elastic unit; the valve sleeve unit includes a valve sleeve body; the valve sleeve body is detachably connected to the housing; the valve sleeve body has a coaxial shaft hole; the valve core unit is slidably arranged in the shaft hole; the circumferential wall of the valve sleeve body has a first oil port, a second oil port and a pressure relief oil port; the first oil port and the second oil port are respectively communicated with the shaft hole; the first oil port is communicated with the oil outlet; the second oil port is communicated with the control oil chamber; the pressure relief oil port is communicated with the inner cavity of the housing; the elastic unit is located in the inner cavity of the housing; the valve core unit, the elastic unit and the swash plate are detachably connected in sequence; the force application direction of the oil pressure at the first oil port on the valve core unit is opposite to the force application direction of the elastic unit on the valve core unit;

[0007] Wherein, the adjusting assembly has a first state and a second state; in the first state, the first oil port is communicated with the second oil port, and the second oil port is disconnected from the pressure relief oil port; in the second state, the first oil port is disconnected from the second oil port, and the second oil port is communicated with the pressure relief oil port.

[0008] In some embodiments, the elastic unit includes a first elastic member, a connecting member and a second elastic member; the valve core unit, the first elastic member, the connecting member and the second elastic member are detachably connected in sequence; the end of the second elastic member away from the connecting member is detachably connected to the swash plate; the adjusting assembly further includes a limiting unit; the limiting unit is located in the housing; the limiting unit is detachably connected to the housing; the limiting unit limits the moving distance of the connecting member towards the valve core unit.

[0009] In some embodiments, the valve sleeve unit further includes a sleeve; the valve sleeve body is located in the sleeve; the valve sleeve body is coaxial with the sleeve; the sleeve is provided with a third oil port and a fourth oil port; the first oil port is communicated with the oil outlet through the third oil port; the second oil port is communicated with the control oil chamber through the fourth oil port; the axial length of the sleeve is greater than the axial length of the valve sleeve body; one end of the sleeve extends into the inner cavity of the housing; the connecting member is slidably connected to the sleeve along the axis of the sleeve;

[0010] The elastic unit further includes a connecting shaft and a bushing; the connecting shaft is ball-jointed to one end of the valve core; the connecting shaft is coaxial with the bushing; the connecting shaft is located inside the bushing; the first elastic member is sleeved on the connecting shaft; the bushing is sleeved on the outside of the first elastic member; the bushing abuts against or is fixedly connected to the connecting member.

[0011] In some embodiments, the bushing is located within the sleeve; the bushing is in sliding fit with the inner wall of the sleeve.

[0012] In some embodiments, the limiting unit is one end of the sleeve extending into the inner cavity of the housing; the connecting member includes a first connecting sleeve and a second connecting sleeve; the first connecting sleeve and the second connecting sleeve are coaxial; one end of the first connecting sleeve is integrally formed or fixedly connected to one end of the second connecting sleeve; the inner diameter of the first connecting sleeve is greater than the inner diameter of the second connecting sleeve; the first connecting sleeve is in sliding fit with the outer circumferential wall of the sleeve; the first connecting sleeve is located at one end of the sleeve penetrating into the inner cavity of the housing.

[0013] In some embodiments, the inner circumferential wall of the second connecting sleeve is in contact with the outer circumferential wall of the bushing.

[0014] In some embodiments, the connecting member further includes a first sealing plate; the first sealing plate is fixedly connected or integrally formed with the end of the second connecting sleeve away from the first connecting sleeve;

[0015] The bushing includes an annular sleeve and a second sealing plate; the second sealing plate is fixedly connected or integrally formed with one end of the annular sleeve; one end of the first elastic member abuts against the second sealing plate;

[0016] The first sealing plate abuts against the second sealing plate.

[0017] In some embodiments, the outer diameter of the second connecting sleeve is smaller than the outer diameter of the first connecting sleeve; the second elastic member is sleeved outside the second connecting sleeve; the second elastic member abuts against the end face of the first connecting sleeve.

[0018] In some embodiments, when the first oil port and the second oil port are in a disconnected state, the distance between the sleeve and the second connecting sleeve is negatively correlated with the elastic coefficient of the first elastic member; the distance between the sleeve and the second connecting sleeve is negatively correlated with the elastic coefficient of the second elastic member.

[0019] In some embodiments, the elastic unit further includes a connecting seat; the end of the second elastic member away from the connecting member is fixedly connected or detachably connected to the connecting seat; the connecting seat is ball-jointed with the swash plate.

[0020] To solve the problems of large volume and large weight of the constant power hydraulic pump, the present invention has the following advantages:

[0021] Through the cooperation of the housing of the pump main body assembly and the swash plate structure, where the oil outlet flow rate is positively correlated with the swash plate displacement angle, and the displacement angle is negatively correlated with the control oil chamber oil pressure in a linkage relationship, combined with the valve sleeve unit, spool unit, and elastic unit structures of the adjustment assembly, the automatic pressure-flow matching of the hydraulic system is achieved. The valve sleeve body is connected to the housing in a detachable manner. The spool unit slidably arranged in its shaft hole is subjected to the bidirectional acting forces of the first oil port oil pressure and the elastic unit, and cooperates with the elastic unit and the swash plate in a linkage manner to form a mechanical adjustment mechanism. When the hydraulic pump is in the first state, the first oil port is communicated with the second oil port to establish the control oil chamber pressure, causing the swash plate displacement angle to decrease; when in the second state, the second oil port is communicated with the pressure relief oil port to reduce the control oil chamber pressure, and the displacement angle increases accordingly. This structure integrates the oil circuit switching function of the first oil port, the second oil port, and the pressure relief oil port through the valve sleeve body, and directly drives the swash plate angle adjustment with the elastic force generated by the elastic unit, replacing the traditional solenoid valve and the independent feedback mechanism, so that the constant power adjustment device and the hydraulic pump main body form an integrated structure. Thereby reducing the number of independent valve body components, reducing the total weight of the hydraulic pump, while maintaining the constant power control accuracy, improving the maintenance convenience through the detachable connection structure, and reducing the overall manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Shows a schematic diagram of a constant power regulated integrated hydraulic pump of an embodiment;

[0023] Figure 2 Shows Figure 1 An enlarged schematic diagram of the M area of the constant power regulated integrated hydraulic pump in the embodiment;

[0024] Figure 3 Shows a schematic diagram of the desired power curve of a constant power regulated integrated hydraulic pump of an embodiment.

[0025] Reference Numerals: 10 Pump main body assembly; 11 Housing; 12 Swash plate; 13 Cylinder block; 14 Plunger; 20 Adjustment assembly; 21 Valve sleeve unit; 211 Valve sleeve body; 212 Shaft hole; 213 Sleeve; 214 First adjusting nut; 215 Second adjusting nut; 22 Spool unit; 23 Elastic unit; 231 First elastic member; 232 Connecting member; 2321 First connecting sleeve; 2322 Second connecting sleeve; 2323 First sealing plate; 233 Second elastic member; 234 Connecting shaft; 235 Bushing; 2341 Annular sleeve; 2342 Second sealing plate; 236 Connecting seat. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Now, the present disclosure will be described with reference to several exemplary embodiments. It should be understood that these embodiments are described only to enable those of ordinary skill in the art to better understand and thus implement the present disclosure, rather than implying any limitation to the scope of the present disclosure.

[0027] As used herein, the term "comprising" and its variants are to be construed as open-ended terms meaning "including but not limited to". The term "based on" is to be construed as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be construed as "at least one embodiment". The term "another embodiment" is to be construed as "at least one other embodiment". The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation. Also, in addition to being used to indicate an orientation or positional relationship, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to specific circumstances. In addition, the terms "installed", "arranged", "provided with", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral structure; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, or there may be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "a plurality of" means two or more.

[0028] Flight control system hydraulic pumps, engine-driven pumps, auxiliary power unit hydraulic pumps, special function hydraulic pumps (such as fuel boost pumps, environmental control system pumps), etc. in an aircraft hydraulic system all have a constant power regulation function. However, current constant power regulation technologies rely on complex mechanical linkage devices and hydraulic control valve groups. For example, the constant power control of a traditional axial piston 14 pump requires the integration of a pressure sensor, an electro-hydraulic proportional valve and a mechanical feedback mechanism, resulting in an increase in the volume and weight of the hydraulic pump, and increasing the aircraft energy consumption.

[0029] In this embodiment, in order to reduce the volume and weight of the hydraulic pump to reduce the aircraft self-weight and energy consumption, this embodiment discloses a constant power regulation integrated hydraulic pump. As Figure 1As shown in the figure, the constant power regulation integrated hydraulic pump may include a pump body assembly 10 and a regulation assembly 20. The pump body assembly 10 may include a housing 11 and a swash plate 12. The housing 11 may have an oil outlet and a control oil chamber. The swash plate 12 may be rotatably disposed within the housing 11. The flow rate of the oil outlet may be positively correlated with the displacement angle of the swash plate 12, and the displacement angle of the swash plate 12 may be negatively correlated with the oil pressure in the control oil chamber. That is, the larger the tilt angle (displacement angle) of the swash plate 12, the greater the flow rate of the oil outlet; the smaller the oil pressure in the control oil chamber, the larger the tilt angle (displacement angle) of the swash plate 12. As Figure 2 shown in the figure, the regulation assembly 20 may include a valve sleeve unit 21, a valve core unit 22, and an elastic unit 23. The valve sleeve unit 21 may include a valve sleeve body 211. The valve sleeve body 211 may be detachably connected to the housing 11 and have a coaxial shaft hole 212. The valve core unit 22 may be slidably disposed within the shaft hole 212. The circumferential wall of the valve sleeve body 211 may have a first oil port, a second oil port, and a pressure relief oil port. The first oil port and the second oil port are respectively communicated with the shaft hole 212. The first oil port may be communicated with the oil outlet. The second oil port may be communicated with the control oil chamber. The pressure relief oil port may be communicated with the inner cavity of the housing 11. The valve core unit 22, the elastic unit 23, and the swash plate 12 are detachably connected in sequence; the force application direction of the oil pressure at the first oil port on the valve core unit 22 may be opposite to the force application direction of the elastic unit 23 on the valve core unit 22. Among them, the regulation assembly 20 has a first state and a second state; in the first state, the first oil port is communicated with the second oil port, and the second oil port is disconnected from the pressure relief oil port; in the second state, the first oil port is disconnected from the second oil port, and the second oil port is communicated with the pressure relief oil port. Through the above settings, the high-pressure oil fluid at the oil outlet can enter the shaft hole 212 through the first oil port to push the valve core unit 22 to slide; after the valve core unit 22 is opened, the first oil port is communicated with the second oil port, so that the oil fluid can enter the control oil chamber through the second oil port to control the swash plate 12 to adjust its own tilt angle; when the second oil port is communicated with the pressure relief oil port, the oil fluid can be depressurized through the pressure relief oil port to the inner cavity of the housing 11, so as to ensure that the oil pressure in the control oil chamber is relatively low, so that the swash plate 12 can increase its tilt angle. This solution forms an integrated structure through the elastic unit 23, and uses a simple mechanical connection relationship to provide a damping force for the valve core unit 22 to adjust the opening pressure of the valve core unit 22, and at the same time can realize the automatic adjustment of the displacement angle of the swash plate 12. When the oil pressure in the control oil chamber increases, the displacement angle of the swash plate 12 decreases, so that the swash plate 12 compresses the elastic unit 23, thereby increasing the damping force provided by the elastic unit 23, increasing the opening pressure of the valve core unit 22, and keeping the output power of the hydraulic pump constant, having the technical effects of compact structure, simple processing technology, and low manufacturing cost.

[0030] In some other embodiments, such as Figure 1As shown, the pump body assembly 10 further includes a cylinder block 13 and a plunger 14; a plurality of plungers 14 are circumferentially spaced along the cylinder block 13; the plunger 14 is slidably connected to the cylinder block 13; the axis of the plunger 14 is parallel to the axis of the cylinder block 13; one end of the plunger 14 is detachably connected to the swash plate 12. The first oil port, the second oil port and the pressure relief oil port can be sequentially and spacedly arranged on the valve sleeve body 211, and the first oil port is located at one end of the valve sleeve body 211 away from the elastic unit 23.

[0031] In this embodiment, the elastic unit 23 includes a first elastic member 231, a connecting member 232 and a second elastic member 233; the valve core unit 22, the first elastic member 231, the connecting member 232 and the second elastic member 233 are sequentially detachably connected; one end of the second elastic member 233 away from the connecting member 232 is detachably connected to the swash plate 12; the adjusting assembly 20 further includes a limiting unit; the limiting unit is located in the housing 11; the limiting unit is detachably connected to the housing 11; the limiting unit is used to limit the moving distance of the connecting member 232 towards the valve core unit 22. The working principle is as follows: in the working state of the first stage, there is a gap between the limiting unit and the connecting member 232. At this time, the opening pressure of the valve core unit 22 is equal to the sum of the pressures of the first elastic member 231 and the second elastic member 233. During the process of the outlet oil pressure of the plunger 14 pump gradually increasing from 0, the angle of the swash plate 12 always remains the largest, and the outlet flow rate of the plunger 14 pump always remains in the full flow state. When the outlet oil pressure of the plunger 14 pump is greater than the opening pressure of the valve core unit 22, it enters the working state of the second stage. The valve core unit 22 opens, so that the first oil port is communicated with the second oil port. The angle of the swash plate 12 becomes smaller. The swash plate 12 pushes the second elastic member 233, the connecting member 232 and the first elastic member 231, thereby changing the resistance of the elastic unit 23 to the valve core unit 22, and further increasing the opening pressure of the valve core unit. This second stage is the constant power regulation stage. When the outlet oil pressure of the plunger 14 pump gradually increases and the angle of the swash plate 12 gradually becomes smaller until the connecting member 232 abuts against the limiting unit, it enters the working state of the third stage at this time. Since in the third stage, the second elastic member 233 is squeezed by the connecting member 232 and the swash plate 12, the pressure of the second elastic member 233 will gradually be greater than the pressure of the first elastic member 231 at this time. Thus, the right end of the first elastic member 231 is restricted by the connecting member 232 to keep its position constant. At this time, in the third stage, the opening pressure of the valve core unit 22 is equal to the elastic force of the first elastic member 231. Thus, the third stage is the constant pressure variable stage. Under the constant pressure condition, by regulating with constant pressure variable, the outlet flow rate of the plunger 14 pump can be greatly reduced, and energy can be effectively saved. For a long-term operating hydraulic system, this can greatly reduce the energy consumption cost and improve the energy utilization rate. In addition, the constant pressure output can prevent the system pressure from being too high and damaging the hydraulic components, and prolong the service life of the components.

[0032] In this embodiment, as Figure 2As shown, the valve sleeve unit 21 may further include a sleeve 213. The valve sleeve body 211 may be located in the sleeve 213 and coaxial with the sleeve 213. The sleeve 213 may be provided with a third oil port and a fourth oil port. The first oil port may communicate with the oil outlet through the third oil port, and the second oil port may communicate with the control oil chamber through the fourth oil port. The axial length of the sleeve 213 may be greater than the axial length of the valve sleeve body 211. One end of the sleeve 213 may extend into the inner cavity of the housing 11, and the connecting member 232 may be slidably connected to the sleeve 213 along the axis of the sleeve 213. This structure establishes an oil passage between the oil outlet and the control oil chamber through the extended setting of the sleeve 213, enabling the spool unit 22 to directly sense the change in oil pressure at the oil outlet and providing a structural basis for pressure feedback regulation.

[0033] In this embodiment, as Figure 2 shown, the elastic unit 23 may further include a connecting shaft 234 and a bushing 235. The connecting shaft 234 may be ball-jointed to one end of the spool and coaxial with the bushing 235. The connecting shaft 234 may be located inside the bushing 235. The first elastic member 231 may be sleeved on the connecting shaft 234, and the bushing 235 may be sleeved outside the first elastic member 231 and in contact or fixedly connected to the connecting member 232. This design realizes the force transmission between the elastic unit 23 and the spool unit 22 through the connecting shaft 234, and uses the bushing 235 to radially limit the first elastic member 231 to prevent the first elastic member 231 from deflecting or displacing during compression, ensuring the stability of damping force transmission.

[0034] In this embodiment, as Figure 2 shown, the bushing 235 may be located in the sleeve 213 and slidably fit with the inner wall of the sleeve 213. This mating relationship forms a guiding structure through the sliding contact between the bushing 235 and the sleeve 213, further restricting the movement trajectory of the first elastic member 231 and enhancing the overall stability of the elastic unit 23.

[0035] In this embodiment, as Figure 2 shown, the limiting unit is one end of the sleeve 213 extending into the inner cavity of the housing 11. The connecting member 232 may include a first connecting sleeve 2321 and a second connecting sleeve 2322. The first connecting sleeve 2321 may be coaxial with the second connecting sleeve 2322 and connected to each other at one end. The inner diameter of the first connecting sleeve 2321 may be greater than the inner diameter of the second connecting sleeve 2322. The first connecting sleeve 2321 may be slidably fitted to the outer circumferential wall of the end of the sleeve 213 penetrating into the inner cavity of the housing 11. The above stepped sleeve 213 structure forms a limiting step through the change in the inner diameters of the first connecting sleeve 2321 and the second connecting sleeve 2322. When the connecting member 232 slides to a predetermined stroke and abuts against the sleeve 213, a mechanical limiting mechanism is established, enabling the hydraulic pump to switch from the constant power regulation stage to the constant pressure variable regulation stage. As Figure 2As shown, there is a gap H between the second connecting sleeve 2322 and the end of the sleeve 213. When the external load of the hydraulic pump increases, the oil pressure at the oil outlet increases. When it reaches the opening pressure of the regulating assembly 20, the spool unit 22 can enter the first state (the first oil port is communicated with the second oil port, and the second oil port is disconnected from the pressure relief oil port), so that the oil outlet is communicated with the control oil chamber. The oil pressure in the control oil chamber pushes the swash plate 12 to move in the direction of decreasing flow rate (the displacement angle of the swash plate 12 becomes smaller). At this time, the first elastic member 231 and the second elastic member 233 are equivalent to a series structure. When the external load makes the pressure of the hydraulic pump reach a certain magnitude, the second connecting sleeve 2322 contacts the sleeve 213 (the gap H changes to 0 under the influence of the compression deformation of the first elastic member 231 and the second elastic member 233). At this time, the first elastic member 231 and the second elastic member 233 are equivalent to being independent of each other, and the displacement angle of the swash plate 12 continues to become smaller until it is 0°.

[0036] As Figure 3 shown, P is the oil pressure of the hydraulic pump, and Q is the oil flow rate of the hydraulic pump. Before the oil pressure at the oil outlet reaches the opening pressure of the regulating assembly 20, the pressure-flow curve of the hydraulic pump is in the A-B stage of the desired power curve. Among them, A is the node of the oil pressure output from the oil outlet, and B is the node where the constant power regulation of the hydraulic pump starts.

[0037] As Figure 3 shown, when the oil pressure at the oil outlet reaches the opening pressure of the regulating assembly 20, but the second connecting sleeve 2322 has not abutted against the sleeve 213 (when the gap H is greater than 0), the pressure-flow curve of the hydraulic pump is in the B-C stage of the desired power curve, that is, the constant power regulation stage of the hydraulic pump. Among them, C is the node where the constant power regulation of the hydraulic pump switches to the constant pressure variable regulation.

[0038] As Figure 3 shown, when the second connecting sleeve 2322 abuts against the sleeve 213 (when the gap H is 0), the pressure-flow curve of the hydraulic pump is in the C-D stage of the desired power curve, that is, the constant pressure variable regulation stage of the hydraulic pump. Among them, D is the node where the displacement angle of the swash plate 12 is 0°.

[0039] In this embodiment, as Figure 2 shown, the inner circumferential wall of the second connecting sleeve 2322 can be fitted with the outer circumferential wall of the bushing 235. This fitting relationship enables the first elastic member 231 and the second elastic member 233 to form a spring system arranged in series, and realizes the multi-stage regulation characteristics of the constant power regulation and the constant pressure variable regulation of the hydraulic pump through the cooperative action of the two elastic members.

[0040] In this embodiment, as Figure 2As shown, the connecting member 232 may further include a first sealing plate 2323, and the first sealing plate 2323 may be connected to the end of the second connecting sleeve 2322. The bushing 235 may include an annular sleeve 2341 and a second sealing plate 2342. The second sealing plate 2342 may be connected to one end of the annular sleeve 2341. One end of the first elastic member 231 may abut against the second sealing plate 2342, and the first sealing plate 2323 may abut against the second sealing plate 2342. Through the above arrangement, an axial limiting constraint is formed on the first elastic member 231, effectively preventing the first elastic member 231 from moving axially under vibration conditions and maintaining the stable working state of the elastic unit 23. In some other embodiments, holes may be formed in the first sealing plate 2323, so that the oil in the inner cavity of the housing 11 lubricates and cools the bushing 235.

[0041] In this embodiment, as Figure 2 shown, the outer diameter of the second connecting sleeve 2322 may be smaller than the outer diameter of the first connecting sleeve 2321. The second elastic member 233 may be sleeved outside the second connecting sleeve 2322 and abut against the end face of the first connecting sleeve 2321. A positioning step is formed by the difference in the outer diameter dimensions of the first connecting sleeve 2321 and the second connecting sleeve 2322, so as to radially constrain the second elastic member 233, prevent the spring from shifting during the compression process, and can be connected in series with the first elastic member 231 to transmit the damping force to the spool unit 22.

[0042] In this embodiment, when the first oil port is disconnected from the second oil port, the distance between the sleeve 213 and the second connecting sleeve 2322 may be negatively correlated with the elastic coefficient of the first elastic member 231, and at the same time negatively correlated with the elastic coefficient of the second elastic member 233. By adjusting the stiffness parameters of the two elastic members, this mechanical relationship can accurately control the switching critical point between the constant power regulation stage and the constant pressure variable regulation stage, and realize the smooth transition between the two working modes.

[0043] In this embodiment, as Figure 2 shown, the elastic unit 23 may further include a connecting seat 236. One end of the second elastic member 233 away from the connecting member 232 may be connected to the connecting seat 236, and the connecting seat 236 may be ball-hinged to the swash plate 12. This ball-hinge connection structure allows the swash plate 12 to automatically adjust the connection angle during rotation through a conical surface or spherical surface fitting method, ensuring the continuity and stability of the elastic force transmission. At the same time, the cooperation between the connecting seat 236 and the connecting member 232 can axially position the second elastic member 233.

[0044] In some other embodiments, the valve sleeve unit 21 further includes a first adjusting nut 214 and a second adjusting nut 215; the first adjusting nut 214 is threadedly connected to the end of the valve sleeve body 211 away from the first elastic member 231; the second adjusting nut 215 is threadedly connected to the end of the sleeve 213 away from the first elastic member 231; the first adjusting nut 214 abuts against the end of the sleeve 213 away from the first elastic member 231; the second adjusting nut 215 abuts against the housing 11; by adjusting the first adjusting nut 214 and the second adjusting nut 215, the pre-tightening force of the elastic unit 23 can be changed, and at the same time, the size of the gap H can be adjusted to realize the adjustment of the switching critical point B of the constant power adjustment stage and the switching critical point C of the constant pressure variable adjustment stage.

[0045] It should be understood that the "present embodiment" mentioned in the present invention refers to the current described technical points. Multiple "present embodiments" can be the same embodiment or different embodiments.

[0046] Those of ordinary skill in the art can understand that the above embodiments are specific cases for implementing the present disclosure, and in actual applications, various changes can be made to them in form and details without departing from the scope of the present disclosure.

Claims

1. An integrated hydraulic pump with constant power regulation, characterized in that, The constant power regulation integrated hydraulic pump includes: A pump main body assembly, the pump main body assembly includes a housing and a swash plate, the housing has an oil outlet and a control oil chamber; the swash plate is rotatably arranged in the housing; the flow rate of the oil outlet is positively correlated with the displacement angle of the swash plate; the displacement angle of the swash plate is negatively correlated with the oil pressure of the control oil chamber; An adjustment assembly, the adjustment assembly includes a valve sleeve unit, a valve core unit and an elastic unit; the valve sleeve unit includes a valve sleeve body; the valve sleeve body is detachably connected to the housing; the valve sleeve body has a coaxial shaft hole; the valve core unit is slidably arranged in the shaft hole; the circumferential wall of the valve sleeve body has a first oil port, a second oil port and a pressure relief oil port; the first oil port and the second oil port are respectively communicated with the shaft hole; the first oil port is communicated with the oil outlet; the second oil port is communicated with the control oil chamber; the pressure relief oil port is communicated with the inner cavity of the housing; the elastic unit is located in the inner cavity of the housing; the valve core unit, the elastic unit and the swash plate are detachably connected in sequence; the force application direction of the oil pressure of the first oil port on the valve core unit is opposite to the force application direction of the elastic unit on the valve core unit; the elastic unit includes a first elastic member, a connecting member and a second elastic member; the valve core unit, the first elastic member, the connecting member and the second elastic member are detachably connected in sequence; the end of the second elastic member far away from the connecting member is detachably connected to the swash plate; the adjustment assembly further includes a limiting unit; the limiting unit is located in the housing; the limiting unit is detachably connected to the housing; the limiting unit limits the moving distance of the connecting member towards the valve core unit; Wherein, the adjustment assembly has a first state and a second state; in the first state, the first oil port is communicated with the second oil port, and the second oil port is disconnected from the pressure relief oil port; in the second state, the first oil port is disconnected from the second oil port, and the second oil port is communicated with the pressure relief oil port.

2. The constant power regulation integrated hydraulic pump according to claim 1, wherein The valve sleeve unit further includes a sleeve; the valve sleeve body is located in the sleeve; the valve sleeve body is coaxial with the sleeve; the sleeve is provided with a third oil port and a fourth oil port; the first oil port is communicated with the oil outlet through the third oil port; the second oil port is communicated with the control oil chamber through the fourth oil port; the axial length of the sleeve is greater than the axial length of the valve sleeve body; one end of the sleeve extends into the inner cavity of the housing; the connecting member is slidably connected to the sleeve along the axis of the sleeve; The elastic unit further includes a connecting shaft and a bushing; the connecting shaft is ball-jointed with one end of the valve core; the connecting shaft is coaxial with the bushing; the connecting shaft is located inside the bushing; the first elastic member is sleeved on the connecting shaft; the bushing is sleeved on the outside of the first elastic member; the bushing abuts against or is fixedly connected to the connecting member.

3. The constant power regulation integrated hydraulic pump according to claim 2, wherein The bushing is located inside the sleeve; the bushing is in sliding fit with the inner wall of the sleeve.

4. The integrated hydraulic pump with constant power regulation according to claim 2, wherein The limiting unit is the end of the sleeve extending into the inner cavity of the housing; the connecting member includes a first connecting sleeve and a second connecting sleeve; the first connecting sleeve and the second connecting sleeve are coaxial; one end of the first connecting sleeve and one end of the second connecting sleeve are integrally formed or fixedly connected; the inner diameter of the first connecting sleeve is greater than the inner diameter of the second connecting sleeve; the first connecting sleeve is in sliding fit with the outer circumferential wall of the sleeve; the first connecting sleeve is located at the end of the sleeve penetrating into the inner cavity of the housing.

5. The integrated hydraulic pump with constant power regulation according to claim 4, wherein The inner circumferential wall of the second connecting sleeve is in contact with the outer circumferential wall of the bushing.

6. The integrated hydraulic pump with constant power regulation according to claim 4, wherein The connecting member further includes a first sealing plate; the first sealing plate is fixedly connected or integrally formed with the end of the second connecting sleeve away from the first connecting sleeve; The bushing includes an annular sleeve and a second sealing plate; the second sealing plate is fixedly connected or integrally formed with one end of the annular sleeve; one end of the first elastic member abuts against the second sealing plate; The first sealing plate abuts against the second sealing plate.

7. The integrated hydraulic pump with constant power regulation according to claim 4, wherein The outer diameter of the second connecting sleeve is smaller than the outer diameter of the first connecting sleeve; the second elastic member is sleeved on the outside of the second connecting sleeve; the second elastic member abuts against the end face of the first connecting sleeve.

8. The integrated hydraulic pump with constant power regulation according to claim 4, wherein When the first oil port and the second oil port are disconnected, the distance between the sleeve and the second connecting sleeve is negatively correlated with the elastic coefficient of the first elastic member; the distance between the sleeve and the second connecting sleeve is negatively correlated with the elastic coefficient of the second elastic member.

9. The integrated hydraulic pump with constant power regulation according to claim 1, wherein The elastic unit further includes a connecting seat; the end of the second elastic member away from the connecting member is fixedly connected or detachably connected to the connecting seat; the connecting seat is ball-hinged to the swash plate.

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