Axial hydraulic plunger pump
By using a fixed cylinder block and non-rotating plunger design, combined with a swashplate swing and check valve structure, the internal leakage and low efficiency problems of existing axial piston pumps are solved, achieving high-efficiency hydraulic delivery and improved mechanical efficiency.
Patent Information
- Application Number
- CN202520459830.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-03-17
AI Technical Summary
Existing straight-shaft and slant-shaft axial piston pumps suffer from severe internal leakage due to the rotating structure of the cylinder and piston, resulting in low volumetric and mechanical efficiency.
It adopts a structural design with a fixed cylinder block and a non-rotating plunger. It uses the swing of the swashplate to drive the plunger to reciprocate within the plunger bore. Combined with the elastic preload of the check valve and the swashplate push rod, it reduces leakage points and decreases rotational inertia. The displacement efficiency is optimized by adjusting the swashplate tilt angle.
It improves the volumetric and mechanical efficiency of the plunger pump, reduces noise and operating temperature rise, and is suitable for high-pressure conditions.
Smart Images
Figure CN223952723U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to hydraulic field especially relates to an axial hydraulic plunger pump. BACKGROUND
[0002] The axial plunger pump is a kind of hydraulic pump, it transports liquid by the axial movement of plunger.The main feature of this pump is compact structure, even flow, high pressure, widely used in various hydraulic systems, especially in the occasion requiring high pressure and high efficiency.The existing straight shaft type axial plunger pump and inclined shaft type axial plunger pump are mostly fixed inclined disc and oil distribution disc, cylinder body and plunger rotating structure, there are multiple dynamic sealing surfaces between cylinder body and oil distribution disc in hydraulic pump, cause larger internal leakage, cause the volumetric efficiency of plunger pump to be unable to further improve, simultaneously, the rotation of cylinder body and plunger assembly has larger rotational inertia, simultaneously, multiple movement friction pairs exist, cause the mechanical efficiency of hydraulic pump to be lower. SUMMARY
[0003] The utility model solves the technical problems that the volumetric efficiency and mechanical efficiency of the existing plunger pump are lower, and provides an axial hydraulic plunger pump to solve the above problems.
[0004] The utility model adopts the technical scheme that an axial hydraulic plunger pump, including the casing, the one end of casing is installed with tail cover, and the other end is installed with end cover;In the casing, fixedly installed with cylinder body on the inner end surface of tail cover;A plurality of plunger holes are formed on the cylinder body along the axial direction, and each plunger hole is slidably installed with a plunger.
[0005] Rotatably installed with transmission shaft in the end cover, the transmission shaft is provided with pressure disc, the end surface of pressure disc is provided with inclined hole, and the center line of inclined hole and the center line of transmission shaft are obliquely intersected;Pressure disc bearing is installed in the inclined hole.
[0006] The casing is also provided with inclined disc and return disc, the plunger ball hole is formed on the inclined disc, the outer end of plunger is provided with plunger ball hinge part, and the return disc is fixedly installed on the end surface of inclined disc and is pressed into plunger ball hole with plunger ball hinge part;The inclined disc is fixedly installed on the inner ring of pressure disc bearing.
[0007] The tail cover is provided with oil outlet, and the one-way valve is arranged between the oil outlet and the plunger hole to realize one-way communication between the plunger hole and the oil outlet, and the one-way valve is arranged on the plunger hole to realize one-way communication between the cavity of cylinder body and the plunger hole.
[0008] Further, the cylinder body is provided with a spring hole, the spring hole is provided with a spring, a swash plate top rod is inserted into the spring hole, the swash plate top rod is pressed on the spring, and the outer end of the swash plate top rod is provided with a swash plate ball hinge part.
[0009] Further, the tail cover is provided with a main oil channel, and the main oil channel is communicated with the oil outlets.
[0010] Further, the end cover is provided with a supporting bearing, and the outer side of the supporting bearing is provided with a dustproof ring and a pressing plate.
[0011] Further, the included angle between the center line of the inclined hole and the center line of the transmission shaft is 7.18°.
[0012] The axial hydraulic plunger pump is provided with a fixed cylinder body and a non-rotating plunger structure, the plunger is driven to reciprocate in the plunger hole through swash plate swinging, the leakage points in the pump are reduced, the rotational inertia of the plunger pump is reduced, the internal friction pairs are reduced, the volumetric efficiency and mechanical efficiency of the plunger pump are improved, the working noise is reduced, and the working temperature rise of the hydraulic pump is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0013] The utility model is further explained in connection with the drawings and embodiments.
[0014] Figure 1 It is a structure schematic view of the axial hydraulic plunger pump.
[0015] In the figure, 1 is a shell, 2 is a tail cover, 3 is an end cover, 4 is a cylinder body, 5 is a plunger hole, 6 is a plunger, 7 is a transmission shaft, 8 is a pressure plate, 9 is an inclined hole, 10 is a pressure plate bearing, 11 is a swash plate, 12 is a return plate, 13 is an oil outlet, 14 is a check valve, 15 is a spring hole, 16 is a spring, 17 is a swash plate top rod, 18 is a main oil channel, 19 is a supporting bearing, 20 is a dustproof ring, and 21 is a pressing plate. DETAILED DESCRIPTION
[0016] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the utility model and cannot be understood as limiting the utility model. On the contrary, the embodiments of the utility model include all changes, modifications and equivalents falling within the spirit and scope of the appended claims.
[0017] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.
[0018] In addition, the terms "first", "second", and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances. In addition, in the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more.
[0019] Any process or method descriptions in the flowchart or otherwise described herein can be understood as representing code modules, segments, or portions of code that include one or more executable instructions for implementing specific logic functions or steps, and the scope of the preferred embodiments of the utility model includes additional implementation in which the functions are performed in different orders, in substantially simultaneous fashion, or in reverse order, according to the functions involved, which should be understood by those skilled in the art to which the embodiments of the utility model belong.
[0020] As Figure 1The utility model provides a kind of axial hydraulic plunger pump, including shell 1, the one end of the shell 1 is equipped with tail cover 2, the other end is equipped with end cover 3;In the shell 1, be fixedly installed on the inner end surface of the tail cover 2 and be equipped with cylinder body 4;Several plunger holes 5 are opened in the cylinder body 4 along the axial direction, and each plunger hole 5 is slidably installed with plunger 6;End cover 3 is rotatably installed with transmission shaft 7, and transmission shaft 7 is provided with pressure plate 8, and the end surface of pressure plate 8 is provided with inclined hole 9, and the center line of inclined hole 9 is obliquely intersected with the center line of transmission shaft 7;Pressure plate bearing 10 is installed in inclined hole 9;Inclined disc 11 and return disc 12 are further provided in the shell 1, plunger ball hole is provided on the inclined disc 11, the outer end of the plunger 6 is provided with plunger ball hinge part, and the return disc 12 is fixedly installed on the end surface of the inclined disc 11 and is pressed into the plunger ball hole in the plunger ball hinge part;The inclined disc 11 is fixedly installed in the inner ring of the pressure plate bearing 10;The tail cover 2 is provided with oil outlet 13, and the one-way valve 14 is provided between the oil outlet 13 and the plunger hole 5, so that the plunger hole 5 is unidirectionally communicated to the oil outlet 13, and the one-way valve 14 is provided on the plunger hole 5, so that the inner cavity of the cylinder body 4 is unidirectionally communicated to the plunger hole 5.
[0021] The plunger 6 pump of the present application is in the form of an axial plunger 6 pump, which is different from the structure of the traditional cylinder body 4 rotating to cooperate with the flow distribution disc to pump oil. The present application adopts the structure of the cylinder body 4 fixed on the tail cover 2. The specific working process is as follows: the transmission shaft 7 starts to rotate under the drive of the motor or other driving mechanism, and the pressure plate 8 at one end of the transmission shaft 7 also rotates. Since the inclined hole 9 on the pressure plate 8 is obliquely arranged, the inclined hole 9 will drive the inclined disc 11 to swing in the circumferential direction under the pushing and pulling of the pressure plate bearing 10 as the pressure plate 8 rotates. Since the plunger 6 is pressed tightly against the end surface of the inclined disc 11 by the return disc 12, the swinging inclined disc 11 will in turn drive the plunger 6 to move axially, thereby performing the work of oil suction and pumping in the plunger hole 5.
[0022] When the plunger 6 exits the plunger hole 5, the one-way valve 14 between the oil outlet 13 and the plunger hole 5 is closed, and the one-way valve 14 between the plunger hole 5 and the inner cavity of the cylinder body 4 is opened, so that the hydraulic oil in the inner cavity of the cylinder body 4 can be sucked into the plunger hole 5, thereby completing the oil suction. When the plunger 6 enters the plunger hole 5, the one-way valve 14 between the oil outlet 13 and the plunger hole 5 is opened, and the one-way valve 14 between the plunger hole 5 and the inner cavity of the cylinder body 4 is closed, so that the plunger 6 pumps the hydraulic oil in the plunger hole 5 into the oil outlet 13, thereby completing the oil pumping operation.
[0023] The application utilizes the inclination angle change of swash plate 11 to change the stroke of plunger 6, and through the transmission of rotary motion to linear reciprocating motion by pressure plate bearing 10, and cooperates with bidirectional check valve 14 to realize continuous hydraulic oil delivery and pressure establishment. Compared with the prior art axial plunger 6 pump, the cylinder body 4 and the plunger 6 of the application do not rotate, only the plunger 6 reciprocates, and the rotational inertia of the rotating part is smaller compared with the prior art plunger pump, on the one hand, the motion friction pair is reduced, the heating or wear in the pump is avoided, the mechanical efficiency is improved, on the other hand, the internal leakage points between the cylinder body 4 and the oil distribution plate and between the sliding shoe and the swash plate 11 plane are cancelled, the volumetric efficiency of the plunger 6 pump is improved, and the volumetric efficiency is particularly improved under high pressure working condition.
[0024] The spring hole 15 is arranged in the cylinder body 4, the spring 16 is arranged in the spring hole 15, the swash plate top rod 17 is inserted into the spring hole 15, the swash plate top rod 17 is pressed on the spring 16, the outer end of the swash plate top rod 17 is provided with a swash plate ball hinge part, the end surface of the swash plate 11 is provided with a swash plate ball hole, and the spring 16 pushes the swash plate top rod 17 to tightly push the swash plate ball hinge part in the swash plate ball hole.
[0025] The swash plate top rod 17 is connected with the swash plate 11 by the spring 16 to form an elastic pre-tightening force, so that the swash plate 11 can tightly adhere to the pressure plate 8, and the gap dynamic compensation mechanism between the plunger 6, the swash plate 11 and the pressure plate 8 is realized. At the same time, the spring 16 continuously applies a force to the swash plate 11 through the swash plate top rod 17, which is perpendicular to the swash plate ball hole, offsets the vibration inclination of the swash plate 11 due to oil pressure fluctuation during work, helps to reduce noise, reduces shaking and improves the maximum speed of the plunger 6 pump, and prolongs the service life of the bearing.
[0026] The tail cover 2 is provided with a main oil way 18, and the main oil way 18 is communicated with a plurality of oil outlet ways 13. The main oil way 18 is used for converging the oil outlet ways 13 on the plurality of plunger holes 5, so as to reduce the energy loss caused by local vortex.
[0027] The end cover 3 is provided with a supporting bearing 19, the outer side of the supporting bearing 19 is provided with a dustproof ring 20 and a pressing plate 21. The supporting bearing improves the rotation stability of the transmission shaft 7, reduces the vibration and noise of the plunger 6 pump during operation, and improves the axial bearing capacity of the transmission shaft 7, so that the plunger 6 pump is suitable for high pressure working condition.
[0028] The included angle between the center line of the inclined hole 9 and the center line of the transmission shaft 7 is 7.18°, which is the optimal inclination angle, can balance the displacement efficiency and mechanical impact, can optimize the reversing impact force of the plunger 6, and can maximize the volumetric efficiency of the plunger 6 pump under the rated speed.
[0029] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0030] With the above ideal embodiments according to the present application as the inspiration, through the above description, relevant personnel can certainly make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content in the specification, and the technical scope must be determined according to the scope of claims.
Claims
1. An axial hydraulic piston pump, characterized by: Including the shell (1), one end of the shell (1) is equipped with the tail cover (2), the other end is equipped with the end cover (3), in the shell (1), the fixed installation of the cylinder body (4) is located on the inner end surface of the tail cover (2), the cylinder body (4) is equipped with a plurality of plunger holes (5) along the axial direction, each plunger hole (5) is slidably installed with a plunger (6), The end cover (3) is rotatably installed with a transmission shaft (7), the transmission shaft (7) is provided with a pressure plate (8), the pressure plate (8) is provided with an inclined hole (9) on the end face, the center line of the inclined hole (9) and the center line of the transmission shaft (7) are obliquely intersected, the pressure plate bearing (10) is installed in the inclined hole (9); The shell (1) is further provided with a swash plate (11) and a return plate (12), the swash plate (11) is provided with a plunger ball hole, the outer end of the plunger (6) is provided with a plunger ball hinge part, the return plate (12) is fixedly installed on the end face of the swash plate (11) and is pressed into the plunger ball hole, the swash plate (11) is fixedly installed on the inner ring of the pressure plate bearing (10); The tail cover (2) is provided with an oil outlet (13), the oil outlet (13) and the plunger hole (5) are provided with a one-way valve (14) to communicate the plunger hole (5) to the oil outlet (13) in one way, the plunger hole (5) is provided with a one-way valve (14) to communicate the inner cavity of the cylinder body (4) to the plunger hole (5) in one way.
2. An axial hydraulic piston pump as claimed in claim 1, characterized in that: The cylinder body (4) is provided with a spring hole (15), the spring hole (15) is provided with a spring (16), the swash plate top rod (17) is inserted into the spring hole (15), the swash plate top rod (17) is pressed on the spring (16), the outer end of the swash plate top rod (17) is provided with a swash plate ball hinge part, the end face of the swash plate (11) is provided with a swash plate ball hole, the spring (16) pushes the swash plate top rod (17) to tightly push the swash plate ball hinge part into the swash plate ball hole.
3. An axial hydraulic piston pump as claimed in claim 2, characterized in that: The tail cover (2) is provided with a main oil channel (18), the main oil channel (18) communicates with a plurality of oil outlets (13).
4. An axial hydraulic piston pump as claimed in claim 3, characterized in that: The end cover (3) is provided with a support bearing (19), the outer side of the support bearing (19) is provided with a dustproof ring (20) and a pressing plate (21).
5. An axial hydraulic piston pump as claimed in claim 4, characterized in that: The included angle between the center line of the inclined hole (9) and the center line of the transmission shaft (7) is 7.18°.