Hydraulic motor axial swash plate piston pump

Abstract

The present invention discloses a hydraulic motor axial swash plate piston pump, comprising: a piston pump housing, a piston pump cylinder, a plunger, a pressure ball, a limit support assembly, a sliding shoe, and a thrust plate. The piston pump housing comprises a rear cover and a housing. A motor core shaft extending toward the interior of the housing is formed on the inner side of the rear cover; a motor winding is disposed between the motor core shaft and the inner wall of a mating groove; a plurality of sliding shoes, a limit support assembly, and a pressure ball are sequentially disposed on the side of the thrust plate away from the bottom surface. A first concave spherical surface is disposed on the side of the piston pump cylinder away from the rear cover, and a second concave spherical surface is disposed on the bottom surface. Some of the pressure balls are mounted within the first concave spherical surface, while others are mounted within the second concave spherical surface through a first avoidance hole. The pressure balls press the sliding shoes against the thrust plate via the limit support assembly. The multiple pistons are connected to the sliding shoes in a one-to-one transmission connection. By integrating the motor assembly into the piston pump, the overall structure and weight are effectively reduced, the protruding pump shaft is eliminated, and sealing reliability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of plunger pumps, in particular to a hydraulic motor axial swash plate plunger pump. Background Art

[0002] The axial piston pump is a high-pressure pump type of hydraulic pump. It has the advantages of reliable sealing and high volumetric efficiency, and has therefore been widely used.

[0003] At present, the plunger pump, as an independent hydraulic power element, needs to be connected to an independent electric motor or internal combustion engine through its extended pump shaft to form a motor-hydraulic pump unit to form a hydraulic power unit to work. This connection requires devices such as couplings and pump stands. Due to the large size of the independent electric motor and the addition of accessories such as couplings, the entire hydraulic power unit is large in size and weight, requiring a larger installation space. At the same time, the existence of the extended pump shaft increases the difficulty of sealing and increases the risk of oil leakage. Summary of the Invention

[0004] In view of this, the present invention provides a hydraulic motor axial swash plate plunger pump, which has small size, light weight and reliable sealing.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A hydraulic motor axial swash plate plunger pump comprises a plunger pump housing, a plunger pump cylinder, a plunger, a pressure ball, a position limiting support assembly, a sliding shoe and a thrust plate.

[0007] The plunger pump housing includes: a rear cover and a shell, the rear cover is arranged at the opening of the shell, and a motor core shaft extending toward the inside of the shell is formed on the inner side of the rear cover; the plunger pump cylinder is located inside the shell, and a matching groove is provided on the side of the plunger pump cylinder facing the rear cover, the matching groove is rotatably connected to the motor core shaft, and a motor winding is provided between the motor core shaft and the inner wall of the matching groove; a plurality of plungers are arranged in the plunger pump cylinder at even intervals around the central axis of the motor core shaft; the bottom of the shell has an inclined bottom surface, a thrust plate is mounted on the bottom surface, a first avoidance hole is provided on the thrust plate, and a plurality of sliding shoes, a limit support assembly and a pressure ball are sequentially provided on the side of the thrust plate away from the bottom surface; a first concave spherical surface is provided on the side of the plunger pump cylinder away from the rear cover, and a second concave spherical surface is provided on the bottom surface, part of the pressure balls are mounted in the first concave spherical surface, and part of the pressure balls are mounted in the second concave spherical surface through the first avoidance hole, the pressure balls press the sliding shoes against the thrust plate through the limit support assembly, and the plurality of plungers are transmission-connected to the plurality of sliding shoes in a one-to-one correspondence.

[0008] Preferably, the limit support assembly includes a spring disk and a return disk, a limit step surface is provided on the bottom of the sliding shoe, the top of the sliding shoe passes through the return disk and the spring disk in sequence to be hinged to the ball head of the plunger, the return disk abuts against the limit step surface, a second avoidance hole is provided on the spring disk, and a third avoidance hole is provided on the return disk, part of the pressure balls pass through the second avoidance hole, the third avoidance hole and the first avoidance hole in sequence and are installed in the second concave spherical surface, wherein the pressure ball presses the spring disk against the return disk and the sliding shoe against the thrust plate by pressing the inner edge of the second avoidance hole.

[0009] Preferably, the inner edge of the second avoidance hole is recessed toward the third avoidance hole to form a curved surface that fits the outer surface of the press ball.

[0010] Preferably, in the extension direction of the motor core shaft, the motor core shaft is divided into a first mating section and a second mating section in sequence, a countersunk structure is provided at the opening of the mating groove, a bearing is provided between the first mating section and the countersunk structure, and a motor winding is provided between the second mating section and the inner wall of the mating groove.

[0011] Preferably, the diameter of the first fitting segment is greater than the diameter of the second fitting segment.

[0012] Preferably, the motor winding includes a stator winding and a rotor winding, the stator winding is wound on the motor core shaft, and the rotor winding is arranged on the circumference of the inner wall of the matching slot.

[0013] Preferably, an oil suction channel and an oil discharge channel are provided in the rear cover to facilitate the suction and discharge of the hydraulic oil in the plunger hole in the plunger pump cylinder.

[0014] Preferably, a seal is provided between the rear cover and the housing.

[0015] Preferably, a distribution plate is installed between the rear cover and the distribution end surface of the plunger pump cylinder body.

[0016] Compared with the prior art, the hydraulic motor axial swash plate plunger pump disclosed in the present application effectively reduces the overall structure and weight by integrating the motor assembly into the plunger pump, eliminates the protruding pump shaft, and improves the sealing reliability.

[0017] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a cross-sectional view of the hydraulic motor axial swash plate plunger pump disclosed in the embodiment of the present application.

[0019] Reference numerals:

[0020] 100. Hydraulic motor axial swash plate piston pump;

[0021] 1. Plunger pump housing; 11. Rear cover; 12. Housing; 111. Motor core shaft; 112. Oil suction channel; 113. Oil discharge channel; 1111. First mating section; 1112. Second mating section;

[0022] 2. plunger pump cylinder; 21. matching groove; 22. first concave spherical surface; 211. countersunk hole structure;

[0023] 3. Plunger; 4. Pressure ball;

[0024] 5. Limit support assembly; 51. Spring plate; 52. Return plate;

[0025] 6. Sliding shoe; 61. Limiting step surface;

[0026] 7. Thrust plate; 71. First avoidance hole;

[0027] 8. Motor winding; 81. Stator winding; 82. Rotor winding;

[0028] 9. Bearing; 10. Seal; 20. Distribution plate. DETAILED DESCRIPTION

[0029] The present invention discloses a hydraulic motor axial swash plate plunger pump 100, which has small size, light weight and reliable sealing.

[0030] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0032] Reference below Figure 1 A hydraulic motor axial swash plate piston pump 100 according to an embodiment of the present invention will be described.

[0033] The embodiment of the present application discloses a hydraulic motor axial swash plate plunger pump 100, comprising: a plunger pump housing 1, a plunger pump cylinder 2, a plunger 3, a pressure ball 4, a limit support assembly 5, a sliding shoe 6 and a thrust plate 7.

[0034] The plunger pump housing 1 comprises: a rear cover 11 and a housing 12, the rear cover 11 being arranged at the opening of the housing 12, and a motor core shaft 111 extending toward the interior of the housing 12 being formed on the inner side of the rear cover 11; the plunger pump cylinder 2 is located inside the housing 12, and a matching groove 21 is provided on the side of the plunger pump cylinder 2 facing the rear cover 11, the matching groove 21 is rotatably connected to the motor core shaft 111, and a motor winding 8 is provided between the motor core shaft 111 and the inner wall of the matching groove 21; a plurality of plungers 3 are arranged evenly spaced around the central axis of the motor core shaft 111 in the plunger pump cylinder 2; the housing 12 is provided with a plurality of plungers 3 ... The bottom has an inclined bottom surface, the thrust plate 7 is installed on the bottom surface, a first avoidance hole 71 is provided on the thrust plate 7, and a plurality of sliding shoes 6, a limit support assembly 5 and a pressure ball 4 are sequentially provided on the side of the thrust plate 7 away from the bottom surface. A first concave spherical surface 22 is provided on the side of the plunger pump cylinder 2 away from the rear cover 11, and a second concave spherical surface is provided on the bottom surface. Part of the pressure ball 4 is installed in the first concave spherical surface 22, and part of the pressure ball 4 is installed in the second concave spherical surface through the first avoidance hole 71. The pressure ball 4 presses the sliding shoe 6 onto the thrust plate 7 through the limit support assembly 5, and the plurality of plungers 3 are transmission-connected to the plurality of sliding shoes 6 in a one-to-one correspondence.

[0035] Compared with the hydraulic power unit in the prior art, the plunger pump in this embodiment is provided with a motor core shaft 111 and a motor winding 8, which structurally combines the motor assembly with the plunger pump, effectively simplifying the overall structure, improving the space utilization inside the plunger pump housing 12, reducing the overall weight, and reducing the overall volume. At the same time, there is no need to set up an external pump shaft structure to connect to the motor, which effectively improves the overall sealing reliability and reduces the possibility of hydraulic oil leakage; in addition, the motor assembly is integrated into the plunger pump, which simplifies the power transmission chain, and the electrical energy is directly converted into hydraulic energy output through the plunger pump, with high energy output efficiency.

[0036] The plunger pump in this embodiment uses a ball-pressing 4 transmission structure to replace the traditional ball-joint transmission structure. The ball-pressing 4 transmission structure has the advantages of simple manufacturing, easy assembly, and high reliability.

[0037] In some embodiments, for example Figure 1As shown, the limit support assembly 5 includes a spring disk 51 and a return disk 52, a limit step surface 61 is provided at the bottom of the sliding shoe 6, the top of the sliding shoe 6 passes through the return disk 52 and the spring disk 51 in sequence to be hinged with the ball head of the plunger 3, the return disk 52 abuts against the limit step surface 61, a second avoidance hole is provided on the spring disk 51, and a third avoidance hole is provided on the return disk 52. Part of the pressure ball 4 passes through the second avoidance hole, the third avoidance hole and the first avoidance hole 71 in sequence and is installed in the second concave spherical surface, wherein the pressure ball 4 presses the spring disk 51 against the return disk 52 and the sliding shoe 6 against the thrust plate 7 by pressing the inner edge of the second avoidance hole.

[0038] The spring disk 51 is mainly used to provide sufficient clamping force so that the sliding shoe 6 can be pressed against the thrust plate 7 without sliding deviation; the return disk 52 is mainly used to provide sufficient supporting force, which can effectively apply the clamping force transmitted by the spring disk 51 to the sliding shoe 6 to ensure effective clamping.

[0039] Furthermore, for example Figure 1 As shown, the inner edge of the second avoidance hole is recessed toward the third avoidance hole to form a curved surface that fits the outer surface of the pressure ball 4. This design can facilitate the assembly between the pressure ball 4 and the spring disk 51. At the same time, the fitting curved surface design can also improve the matching reliability between the pressure ball 4 and the spring disk 51 and enhance the transmission efficiency.

[0040] In some embodiments, for example Figure 1 As shown, in the extension direction of the motor core shaft 111, the motor core shaft 111 is divided into a first mating section 1111 and a second mating section 1112 in sequence, a countersunk structure 211 is provided at the opening of the mating groove 21, a bearing 9 is provided between the first mating section 1111 and the countersunk structure 211, and a motor winding 8 is provided between the second mating section 1112 and the inner wall of the mating groove 21.

[0041] A bearing 9 is provided on the first mating section 1111, which is mainly used to realize the rotational connection between the plunger pump cylinder 2 and the motor core shaft 111; a motor winding 8 is provided on the second mating section 1112, which is used to realize the function of the motor; the first mating section 1111 and the second mating section 1112 are designed on the motor core shaft 111 at the same time, which effectively improves the space utilization and improves the overall integration level of the plunger pump.

[0042] Furthermore, for example Figure 1 As shown, the diameter of the first mating segment 1111 is greater than the diameter of the second mating segment 1112. Compared with the second mating segment 1112, the first mating segment 1111 has a larger diameter and can withstand a greater torque.

[0043] In some embodiments, for example Figure 1As shown, the motor winding 8 includes a stator winding 81 and a rotor winding 82 . The stator winding 81 is wound on the motor core shaft 111 , and the rotor winding 82 is arranged on the circumference of the inner wall of the matching slot 21 .

[0044] In some embodiments, for example Figure 1 As shown, an oil suction channel 112 and an oil discharge channel 113 are provided in the rear cover 11 to facilitate the suction and discharge of the hydraulic oil in the hole of the plunger 3 in the plunger pump cylinder 2.

[0045] In some embodiments, for example Figure 1 As shown, a seal 10 is provided between the rear cover 11 and the housing 12 , which can effectively enhance the overall sealing performance of the plunger pump.

[0046] In some embodiments, for example Figure 1 As shown, a distribution plate 20 is installed between the rear cover 11 and the distribution end surface of the plunger pump cylinder 2 to ensure smoother flow of the hydraulic oil.

[0047] In some embodiments, the plunger pump of the present application adopts an oil cooling method. Compared with the existing hydraulic power unit, the fan in the motor is removed, thereby eliminating the aerodynamic noise source, so that the plunger pump as a whole has better low-noise performance.

[0048] Other structures and operations of the hydraulic motor axial swash plate plunger pump 100 according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0049] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to 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. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0050] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A hydraulic motor axial swash plate plunger pump, characterized in that: include: Plunger pump housing, plunger pump cylinder, plunger, pressure ball, limit support assembly, sliding shoe and thrust plate; The plunger pump housing comprises: a rear cover and a shell, wherein the rear cover is arranged at the opening of the shell, and a motor core shaft extending toward the inside of the shell is formed on the inner side of the rear cover; The plunger pump cylinder is located inside the housing, and a matching groove is provided on the side of the plunger pump cylinder facing the rear cover, the matching groove is rotatably connected to the motor core shaft, and a motor winding is provided between the motor core shaft and the inner wall of the matching groove; the motor winding includes a stator winding and a rotor winding, the stator winding is wound on the motor core shaft, and the rotor winding is provided on the circumference of the inner wall of the matching groove; the plunger pump cylinder is provided with a plurality of plungers evenly spaced and arranged around the central axis of the motor core shaft; The bottom of the shell has an inclined bottom surface, the thrust plate is installed on the bottom surface, a first avoidance hole is provided on the thrust plate, a plurality of the sliding shoes, the limit support assembly and the pressure ball are sequentially provided on the side of the thrust plate away from the bottom surface, a first concave spherical surface is provided on the side of the plunger pump cylinder away from the rear cover, a second concave spherical surface is provided on the bottom surface, some of the pressure balls are installed in the first concave spherical surface, and some of the pressure balls pass through the first avoidance hole and are installed in the second concave spherical surface, the pressure ball presses the sliding shoe onto the thrust plate through the limit support assembly, and the plurality of plungers are transmission-connected to the plurality of sliding shoes in a one-to-one correspondence.

2. The hydraulic motor axial swash plate plunger pump according to claim 1, characterized in that: The limit support assembly includes a spring disk and a return disk, a limit step surface is provided at the bottom of the sliding shoe, the top of the sliding shoe passes through the return disk and the spring disk in sequence to be hinged to the ball head of the plunger, the return disk abuts against the limit step surface, a second avoidance hole is provided on the spring disk, and a third avoidance hole is provided on the return disk. Some of the pressure balls pass through the second avoidance hole, the third avoidance hole and the first avoidance hole in sequence and are installed in the second concave spherical surface, wherein the pressure ball presses the spring disk against the return disk and the sliding shoe against the thrust plate by abutting the inner edge of the second avoidance hole.

3. The hydraulic motor axial swash plate plunger pump according to claim 2, characterized in that: The inner edge of the second avoidance hole is recessed toward the third avoidance hole to form a curved surface that fits the outer surface of the press ball.

4. The hydraulic motor axial swash plate plunger pump according to claim 1, characterized in that: In the extension direction of the motor core shaft, the motor core shaft is divided into a first mating section and a second mating section in sequence, a countersunk structure is provided at the opening of the mating groove, a bearing is provided between the first mating section and the countersunk structure, and a motor winding is provided between the second mating section and the inner wall of the mating groove.

5. The hydraulic motor axial swash plate plunger pump according to claim 4, characterized in that: The diameter of the first fitting segment is greater than the diameter of the second fitting segment.

6. The hydraulic motor axial swash plate plunger pump according to claim 1, characterized in that: An oil suction channel and an oil discharge channel are provided in the rear cover to facilitate the suction and discharge of the hydraulic oil in the plunger hole in the plunger pump cylinder.

7. The hydraulic motor axial swash plate plunger pump according to claim 1, characterized in that: A sealing member is provided between the rear cover and the housing.

8. The hydraulic motor axial swash plate plunger pump according to claim 1, characterized in that: A distribution plate is installed between the rear cover and the distribution end surface of the plunger pump cylinder body.

Images