A high speed axial piston pump

Abstract

The utility model relates to swash plate type axial plunger pump technical field, especially a kind of high-speed axial plunger pump, including shell, transmission shaft, variable mechanism and rotary assembly, rotary assembly includes the cylinder body, plunger, sliding shoe, swash plate support, ball hinge, return disc, return spring and flow distribution disc of assembly. Among them, transmission shaft and cylinder body adopt drum spline connection of circular arc type, avoid the problem that cylinder body overturns and is stuck;Sliding shoe and plunger adopt ball head articulation, plunger can wrap around the ball head rotation of sliding shoe, thereby reduce the distance of sliding shoe centroid to ball hinge center, reduce the centrifugal overturning moment of sliding shoe, improve the anti-overturning capacity of sliding shoe;Plunger is coaxially provided with cylindrical annular cavity, can reduce mass, reduce the influence of centrifugal force to sliding shoe and cylinder body;And the bottom surface of sliding shoe is plated with wear-resistant layer, can reduce the wear degree of sliding shoe bottom surface. Overall improve service life, avoid the overturning failure problem of sliding shoe and cylinder body in high-speed operation process.

Description

TECHNICAL FIELD

[0001] The utility model relates to swash plate type axial plunger pump technical field, especially in a kind of high-speed axial plunger pump. BACKGROUND

[0002] Swash plate type axial plunger pump is widely used in various machines in engineering machinery, metallurgy, machine tool, mine and other fields due to its wide working pressure range, high efficiency, compact structure, small volume, light weight, large power density and other characteristics.

[0003] Traditional swash plate type plunger pump mainly includes shell, transmission shaft, rotating assembly and variable mechanism, wherein, transmission shaft is sealingly rotatably connected with shell;Rotating assembly, such as the hydraulic rotating assembly provided in Chinese invention patent CN117738864A, includes flow distribution disc, cylinder body, plunger, sliding shoe, friction disc, return spring, ball hinge and return disc, cylinder body is connected with transmission shaft through spline, plunger is connected with cylinder body through plunger hole of cylinder body, and plunger can make reciprocating motion in plunger hole of cylinder body;Sliding shoe is hingedly connected with plunger through ball head, and sliding shoe can rotate around ball head of plunger;At the same time, sliding shoe is pressed on friction disc by return disc, and sliding shoe can slide on friction disc, when sliding shoe slides, return disc rotates around ball surface of ball hinge, ball hinge and return disc are pressed by cylinder body through return spring, while cylinder body is pressed tightly by shell and flow distribution disc, and plunger and sliding shoe are provided with central through hole;Friction disc needs to be arranged on the plane of swash plate support;Here, friction disc can also be ignored, and sliding shoe is in contact with the plane of swash plate support alone. The above-mentioned variable mechanism, such as the hydraulic pump displacement control structure provided in Chinese utility model patent CN217055544U, mainly drives the movement of the knob through the axially reciprocating variable piston, the knob is embedded in the swash plate support and drives the swash plate support to adjust the fixed position, and the oil enters and exits the plunger hole of the cylinder body through the flow distribution disc to perform oil absorption and oil discharge.

[0004] However, in the hydraulic pump of new energy excavator, the transmission shaft in swash plate axial plunger pump is driven by motor to rotate at high speed of 4000 revolutions per minute, if the high-speed operation speed of plunger pump is continuously improved, cylinder body overturning failure and sliding shoe overturning failure will be faced, which will affect service life, for example, (1) the rotating cylinder body may rotate relative to the flow distribution disc in an overturned posture due to the influence of axial eccentric load, plunger centrifugal force and main shaft deflection deformation, which will cause the separation failure of fluid seal between cylinder body and flow distribution disc;(2) in addition to bearing the axial force transmitted from high-pressure oil in cylinder body plunger hole, the centrifugal torque caused by axial movement of plunger will make sliding shoe overturn relative to the surface of swash plate support, and this overturning is easy to cause the eccentric wear failure of the outer surface of sliding shoe when high and low pressure switching is performed in cylinder body plunger hole.

[0005] Therefore, it is urgent to improve to avoid the failure of swash plate type axial plunger pump. UTILITY MODEL CONTENT

[0006] The utility model discloses a high -speed axial plunger pump can avoid the cylinder and plunger's overturn failure when high -speed operation of plunger pump.

[0007] In order to realize the above-mentioned purpose, the utility model provides a high -speed axial plunger pump, including casing, transmission shaft, variable mechanism and rotation subassembly, the rotation subassembly includes cylinder, plunger, skid shoe, swash plate support, ball hinge, return disc, return spring and flow distribution disc of assembly, transmission shaft and cylinder adopt the drum spline connection of arc type, skid shoe with plunger adopt ball head articulates, the plunger can wrap around the ball head rotation of skid shoe, the coaxial ring cavity of column is established in the plunger, the bottom surface of skid shoe is plated and is equipped with wear -resisting layer.

[0008] Further, the bottom surface of the skid shoe is also coaxially provided with an inner chamfer and forms a concave shape.

[0009] Further, the bottom surface of the skid shoe is also provided with an outer chamfer.

[0010] Further, the high-speed axial plunger pump further comprises a fixed gap return assembly for limiting the planar gap between the plunger and the swash plate support; the fixed gap return assembly comprises two fixed gap blocks, the two fixed gap blocks are symmetrically arranged relative to the axis of the shift head in the variable mechanism; a spacer is arranged between the two ends of the fixed gap block and the swash plate support, and the spacer is fastened to the swash plate support by bolts; the return disc is located between the fixed gap block and the swash plate support.

[0011] Further, a copper sleeve is arranged between the plunger and the cylinder.

[0012] Compared with the prior art, the utility model has the beneficial effects that: through the ring cavity in the plunger, the mass of the plunger can be reduced, and the influence of the centrifugal force and the centrifugal moment generated by the plunger on the cylinder and the skid shoe is reduced; by adopting the structure that the plunger rotates around the ball head of the skid shoe, a reverse wrapping structure is formed, which can reduce the distance from the centroid of the skid shoe to the center of the ball hinge, thereby reducing the centrifugal overturning moment of the skid shoe and improving the anti-overturning ability of the skid shoe; by adopting the drum spline connection of arc type between the transmission shaft and the cylinder, the self-positioning ability of the cylinder on the drum spline can be ensured, and the problem of cylinder overturning and jamming is avoided; by plating the wear-resistant layer on the bottom surface of the skid shoe, the friction coefficient of the skid shoe can be effectively reduced, and the degree of wear is reduced. The service life of the plunger pump is improved as a whole, and the failure problem of the cylinder and the skid shoe during high-speed operation is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The utility model discloses a high -speed axial plunger pump can avoid the cylinder and plunger's overturn failure when high -speed operation of plunger pump.

[0014] Figure 2 For Figure 1 Structure diagram of the rotary assembly.

[0015] Figure 3 For Figure 2 Another cross-section diagram of the sliding shoe bottom surface.

[0016] Figure 4 For Figure 2 Another cross-section diagram of the sliding shoe bottom surface.

[0017] Figure 5 Structure diagram of the constant clearance return assembly.

[0018] Figure 6 For Figure 2 1 / 4 cross-section diagram of the plunger.

[0019] Wherein: 1, housing; 2, transmission shaft; 3, variable mechanism; 4, rotary assembly; 41, cylinder body; 42, plunger; 43, sliding shoe; 44, swash plate support; 45, spherical hinge; 46, return disc; 47, constant clearance pressure block; 48, return spring; 49, distribution disc; 421, annular cavity; 422, copper sleeve; 431, inner chamfer; 432, outer chamfer; 471, cushion block. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0021] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying 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 present application. EMBODIMENT

[0022] Please refer to Figures 1 to 6The utility model provides a kind of high-speed axial plunger pump, including shell 1, transmission shaft 2, variable mechanism 3 and rotary assembly 4, rotary assembly includes the cylinder body 41 of assembly, plunger 42, sliding shoe 43, swash plate support 44, ball hinge 45, return disc 46, return spring 48 and flow distribution disc 49.Wherein, transmission shaft 2 and cylinder body 41 adopt drum spline connection of circular arc type, can guarantee that cylinder body 41 has better self-positioning ability on drum spline, avoid the problem that cylinder body 41 occurs to overturn and jams;Sliding shoe 43 and plunger 42 adopt ball head articulation, plunger 42 can wrap around the ball head rotation of sliding shoe 43, to form reverse package structure, this reverse package structure can reduce the distance of the centroid of sliding shoe 43 to the center of ball hinge 45, to reduce the centrifugal overturning moment of sliding shoe 43, improve the anti-overturning ability of sliding shoe 43;Plunger 42 is coaxially provided with cylindrical annular cavity 421, to reduce the mass of plunger 42, reduce the centrifugal influence of plunger 42 to sliding shoe 43 and cylinder body 41 in the process of movement, avoid the problem that sliding shoe 43 and cylinder body 41 occur to overturn;The bottom surface of sliding shoe 43 is plated with wear-resistant layer, which can reduce the wear degree of the bottom surface of sliding shoe 43, reduce the overturning probability of sliding shoe 43, to improve the overall service life.

[0023] The above-mentioned drum spline is a special spline that protrudes in a drum shape along the direction of the tooth root, has the characteristics of strong load-carrying capacity, easy installation, high transmission efficiency, and certain compensation and correction ability for installation errors in the radial, axial and angular directions. For example, the existing Chinese invention patent CN110471365A provides a drum spline machining method, which includes three types of circular arc type, included angle type and hybrid type. The utility model adopts the circular arc type, and details are not repeated.

[0024] As an embodiment of the utility model, the bottom surface of the sliding shoe 43 is also coaxially provided with an inner chamfer 431 and forms a concave shape.

[0025] The bottom surface of the sliding shoe 43 can also be provided with an outer chamfer 432.

[0026] By increasing the inner chamfer 431 to form a concave sliding shoe bottom surface, or simultaneously increasing the inner chamfer 431 and the outer chamfer 432, the anti-overturning ability of the sliding shoe 43 can be effectively improved, and the dirt holding capacity of the sliding shoe 43 is also enhanced, reducing the wear degree of the sliding shoe 43 caused by dirt.

[0027] As an embodiment of the utility model, the high-speed axial plunger pump further includes a fixed-gap return assembly for limiting the planar gap between the plunger 42 and the swash plate support 44; the fixed-gap return assembly includes two fixed-gap pressing blocks 47, which are symmetrically arranged relative to the axis of the knob in the variable mechanism 3; the two ends of the fixed-gap pressing block 47 are provided with a pad 471 between the swash plate support 44 and are fastened together by bolts; the return disc 46 is located between the fixed-gap pressing block 47 and the swash plate support 44.

[0028] The fixed gap block 47 is distributed on both sides of the swash bracket 44 and does not interfere with the sliding shoe 43, and the normal operation is not affected. The fixed gap return assembly can control the gap between the sliding shoe 43 and the swash bracket 44 within a certain reasonable range, avoid the gap from becoming large due to suction, and thus improve the overturning resistance of the sliding shoe 43.

[0029] In addition, a copper bushing 422 can be arranged between the plunger 42 and the cylinder body 41 to reduce the wear degree of the plunger 42 and ensure the service life of the plunger pump.

[0030] The utility model can be summarized with other specific forms which do not violate the spirit or main features of the utility model. Therefore, no matter from which point, the above-mentioned implementation scheme of the utility model can only be considered as the description of the utility model and cannot limit the utility model, the claims point out the range of the utility model, and the above-mentioned description does not point out the range of the utility model, therefore, any change in the meaning and range equivalent to the claims of the utility model should be considered as included in the range of the claims of the utility model.

Claims

1. A high-speed axial piston pump comprising a housing (1), a drive shaft (2), a variable mechanism (3) and a swivel assembly (4), which comprises a cylinder block (41), a piston (42), a shoe (43), a swash plate support (44), a ball joint (45), a return plate (46), a return spring (48) and a port plate (49) assembled, characterized in that, The transmission shaft (2) and the cylinder body (41) are connected by a drum-shaped spline with a circular arc type; the slide shoe (43) and the plunger (42) are connected by a ball head hinge, the plunger (42) can rotate around the ball head of the slide shoe (43); the plunger (42) is coaxially provided with a cylindrical annular cavity (421); the bottom surface of the slide shoe (43) is provided with a wear-resistant layer.

2. The high speed axial piston pump of claim 1, wherein, The bottom surface of the slide shoe (43) is also coaxially provided with an inner chamfer (431) and forms a concave shape.

3. The high speed axial piston pump of claim 2, wherein, The bottom surface of the slide shoe (43) is also provided with an outer chamfer (432).

4. A high speed axial piston pump according to any one of claims 1 to 3, characterized in that The high-speed axial plunger pump further comprises a fixed-gap return assembly for limiting the planar gap between the plunger (42) and the swash plate bracket (44); the fixed-gap return assembly comprises two fixed-gap blocks (47), the two fixed-gap blocks (47) are symmetrically arranged relative to the axis of the shift head in the variable mechanism (3); the two ends of the fixed-gap block (47) are provided with a pad (471) between the swash plate bracket (44) and are integrated by bolts; the return disc (46) is located between the fixed-gap block (47) and the swash plate bracket (44).

5. The high speed axial piston pump of claim 4, wherein, The plunger (42) and the cylinder body (41) are provided with a copper sleeve (422).

Images