Valve plate assembly for axial plunger pump

Abstract

The utility model provides a valve plate assembly for an axial plunger pump, which is characterized by comprising a valve plate (105); the rotatable component (106) is arranged to be tightly attached to the valve plate (105) and can be positioned on the side opposite to a cylinder body (103) of the plunger pump, and the rotatable component (106) is configured to be capable of rotating relative to the valve plate (105) so as to partially block and expose an oil suction hole (1051) and an oil discharge hole (1052) of the valve plate (105); the pressure of hydraulic oil applied between an opening (1031) of the cylinder body (103) and the plunger (101) is increased, so that the hydraulic oil is pushed to move in the axial direction towards a swash plate (102) of the axial plunger pump, and lubrication between the cylinder body (103) and the plunger (101) is promoted.

Description

Technical Field

[0001] The present application relates to a valve plate assembly. In addition, the present application also relates to an axial piston pump, which comprises the valve plate assembly. Background Art

[0002] In the prior art, axial piston pumps are widely used. The manufacturing process of axial piston pumps is complicated, there are many parts, especially moving parts, and the price is relatively high. However, the service life of axial piston pumps (especially low-speed piston pumps) in the prior art is still subject to various restrictions. For example, the friction between the plunger surface and the opening surface caused by the radial force between the plunger and its corresponding cylinder opening can easily cause unwanted wear of the axial piston pump. This wear cannot be solved by simply replacing some of the parts, but often leads to the overall replacement and / or discarding of the axial piston pump. This has caused a significant increase in economic costs.

[0003] One reason for the above technical problem is that when the plunger is discharging oil, although the pressure applied to the hydraulic oil in the opening is increasing, the pressure is still not high enough to effectively squeeze the hydraulic oil into the gap between the plunger and the opening of the cylinder body. As a result, the gap between the plunger and the opening lacks or even has no hydraulic oil to effectively lubricate it.

[0004] The prior art relates to a solution in which an oil storage kidney-shaped member with a considerable radial depth and a certain axial length is excavated on the outer wall of the plunger to accommodate and retain the hydraulic oil therein to the maximum extent, hoping to offset the adverse effects caused by insufficient pressure in this way.

[0005] However, this solution still has certain limitations. For example, the pressure imbalance caused by the oil storage kidney-shaped member deteriorates the stability of the plunger during movement, generates noise, and even crashes and is not desirable.

[0006] Taking into account but not limited to the above situation, it is hoped that a new solution can be provided to replace parts or even eliminate the above technical problems. Utility Model Content

[0007] The present application aims to provide a valve plate assembly, which is advantageous in at least one aspect over the prior art.

[0008] To this end, the present application provides, in one aspect, a valve plate assembly for an axial piston pump, characterized by comprising: a valve plate; a rotatable member, which is arranged to closely adhere to the valve plate and can be positioned on the opposite side relative to the cylinder block of the piston pump, wherein the rotatable member is configured to be able to rotate relative to the valve plate to partially block and expose the oil suction hole and the oil discharge hole of the valve plate, so that the pressure of the hydraulic oil applied between the open hole of the cylinder block and the piston increases, thereby pushing the hydraulic oil to move axially towards the swash plate of the axial piston pump, thereby promoting the lubrication between the cylinder block and the piston.

[0009] In a feasible exemplary embodiment, the rotatable member includes an oil suction mating hole and an oil discharge mating hole, and the sizes, shapes and positions of the oil suction mating hole and the oil discharge mating hole are configured to be consistent with the oil suction hole and the oil discharge hole of the valve plate respectively.

[0010] In a feasible exemplary embodiment, the oil suction mating hole is formed as a continuous arc, and the oil discharge mating hole is formed as a plurality of arc-shaped short holes spaced apart from each other along an arc.

[0011] In a feasible exemplary embodiment, a notch is provided at the edge of the valve plate, and correspondingly, a mating notch is provided at the edge of the rotatable member; wherein, when the mating notch and the notch are completely aligned, the rotatable member completely exposes the valve plate, and the oil discharge mating hole is completely aligned with the oil discharge hole, so that the oil discharge hole is in a completely open state, thereby having the largest oil discharge area.

[0012] In a feasible exemplary embodiment, the oil suction mating hole is completely aligned with the oil suction hole, so that the oil suction hole is in a completely open state, thereby having the largest oil suction area.

[0013] In a feasible embodiment, when the mating notch and the notch are partially misaligned, the rotatable member partially blocks the valve plate, and the oil discharge mating hole is partially misaligned relative to the oil discharge hole, so that the oil discharge hole is in a partially closed state, thereby reducing the oil discharge area.

[0014] In a feasible exemplary embodiment, the oil suction mating hole is partially misaligned relative to the oil suction hole, so that the oil suction hole is in a partially closed state, thereby reducing the oil suction area.

[0015] In a feasible exemplary embodiment, the valve plate assembly for an axial piston pump further includes: a connecting rod member, wherein the tail end of the connecting rod member can be pivotally connected to the swash plate, and the head end of the connecting rod member opposite to the tail end is formed into a wedge shape and is configured to be able to drive the rotation of the rotatable member.

[0016] In a feasible exemplary embodiment, when the tilt angle of the swash plate decreases, the head end of the connecting rod member increases the misalignment distance between the mating notch of the rotatable member and the notch of the valve plate to block the oil discharge hole, thereby reducing the oil discharge area.

[0017] In a feasible exemplary embodiment, the valve plate assembly for the axial piston pump further includes a reset member, wherein the reset member is configured such that when the tilt angle of the swash plate increases, the reset member reduces the misalignment distance between the mating notch of the rotatable member and the notch of the valve plate to expose the oil discharge hole, thereby increasing the oil discharge area.

[0018] On the other hand, the present application also relates to an axial piston pump, which includes the valve plate assembly as described above.

[0019] According to the valve plate assembly of the present application and the axial piston pump including such a valve plate assembly, without changing the shape and / or structure of the plunger and / or the cylinder block, by appropriately increasing the pressure of the hydraulic oil in the opening of the cylinder block, a part of the hydraulic oil can be made to flow into the gap between the opening and the plunger in the direction opposite to the movement of the plunger, thereby facilitating the lubrication between the plunger and the opening. In this way, the wear caused by the radial force generated by the swash plate can be reduced. Description of the Drawings

[0020] Figure 1 An axial piston pump according to an embodiment of the present application is shown.

[0021] Figure 2 A valve plate according to an embodiment of the present application is shown.

[0022] Figure 3 A rotatable member cooperating with the valve plate according to an embodiment of the present application is shown.

[0023] Figure 4 An embodiment of the cooperation between the valve plate and the rotatable member according to the present application is shown. Detailed Embodiments

[0024] Some feasible embodiments of the present application will be described below with reference to the drawings. It should be noted that the drawings are not drawn to scale. Some details may be enlarged for clear display, and some non-essential details are omitted.

[0025] As Figure 1 shown, an axial piston pump 100 according to an embodiment of the present application is shown. The axial piston pump 100 includes a plunger 101. The plunger 101 can be implemented as one or more plungers 101. The number of the plungers 101 can be implemented as an odd number or an even number. Frequently, the number of the plungers is generally 7 or 9.

[0026] Each plunger 101 is configured to have a body extending along its length and located at both ends of the body: a first end (outer end) and a second end (inner end). The first end of each plunger 101 is configured to be connectable (by point contact or a slipper member) to the swash plate 102 respectively. The second end of each plunger 101 is configured to be extendable into a corresponding opening 1031 formed in the cylinder block 103. The cylinder block 103 is often formed into a substantially cylindrical shape. The plunger 101 is configured to reciprocate along its length direction in the opening 1031 under the drive of the swash plate 102, so as to be able to suck in and discharge hydraulic oil from the opening 1031 via a window (often circular) correspondingly.

[0027] The axial piston pump 100 further includes a drive shaft 104. The drive shaft 104 is disposed at the center of the cylinder block 103 and is rotatable. The rotation of the drive shaft 104 can drive the rotation of the cylinder block 103.

[0028] As Figures 1-3 shown, the axial piston pump 100 further includes a valve plate assembly. The valve plate assembly includes a valve plate 105 (as Figure 2 shown) and a rotatable member 106 (as Figure 3 shown) used in cooperation with the valve plate 105.

[0029] The rotatable member 106 is configured to be rotatable relative to the valve plate 105 (for example, to partially block and expose the oil suction hole 1051 and the oil discharge hole 1052 of the valve plate 105, as detailed below). This can cause the pressure of the hydraulic oil applied between the opening 1031 of the cylinder block 103 and the plunger 101 to increase. This increased pressure can push the hydraulic oil to move axially in the direction of the swash plate 102 of the axial piston pump. In this way, the lubrication between the cylinder block 103 and the plunger 101 is promoted. It can be understood that the rotation of the rotatable member 106 relative to the valve plate 105 can be based on the (for example, minimum) pressure required to push the hydraulic oil to move axially in the gap in the direction of the swash plate 102 of the axial piston pump.

[0030] The valve plate 105 is disposed on one side of the cylinder block 103 near the second end of the plunger 101 and is used in cooperation with the window 1032. The valve plate 105 is formed to be able to fit the end face of the cylinder block 103, for example, it can be circular.

[0031] The flow distribution plate 105 includes an oil suction hole 1051 and an oil discharge hole 1052. When the cylinder block 103 rotates to make its window 1032 located inside the oil suction hole 1051, the corresponding plunger 101 moves in a direction away from the flow distribution plate 105, and the hydraulic oil passes through the oil suction hole 1051 and the corresponding window 1032 into the opening 1031, thereby performing the oil suction operation. Correspondingly, when the cylinder block 103 rotates to make its window 1032 located inside the oil discharge hole 1052, the corresponding plunger 101 moves in a direction towards the flow distribution plate 105, and the hydraulic oil is discharged from the opening 1031 through the corresponding window 1032 and the oil discharge hole 1052, thereby performing the oil discharge operation.

[0032] As Figure 2 shown, the oil suction hole 1051 is formed as a continuous arc-shaped long hole. In this way, the plunger 101 can suck the hydraulic oil into the corresponding opening 1031 through the window 1032 to the maximum extent. The oil discharge holes 1052 are formed as a plurality of arc-shaped short holes spaced apart from each other along the arc. The plurality of arc-shaped short holes are configured to be associated with the window 1032 of the plunger. This association can involve the number, open area, and / or spacing distance of the oil suction holes 1051, etc.

[0033] The flow distribution plate 105 may further include one or more oil guiding through holes. For example, in the Figure 2 embodiment shown, two oil guiding through holes are shown. On the side of the flow distribution plate 105 facing the cylinder block 103, the first oil guiding through hole 1053a is positioned in the upstream direction of the oil suction hole 1051 and may be further configured to be adjacent to and fluidly connectable to the oil suction hole 1051, and the second oil guiding through hole 1053b is positioned in the upstream direction of the oil discharge hole 1052 and may be further configured to be adjacent to and fluidly connectable to the oil discharge hole 1052. In this way, mechanical vibration, noise, and / or equipment wear caused by large pressure fluctuations can be further alleviated.

[0034] A notch 1054 is provided at the edge of the flow distribution plate 105, which is configured to cooperate with a mating notch 1064 on the rotatable member 106, as will be described in detail later.

[0035] The shape and size of the rotatable member 106 can be configured to substantially correspond to the flow distribution plate 105, for example, formed as a turntable. The material constituting the rotatable member 106 can also be made of a material similar to or the same as that of the flow distribution plate 105. As Figure 1 shown, during use, the rotatable member 106 is arranged closely against the flow distribution plate 105 and positioned on the side opposite to the cylinder block 103. The rotatable member 106 is configured to be able to rotate relative to the flow distribution plate 105 to partially block and expose the oil suction hole 1051 and the oil discharge hole 1052 of the flow distribution plate, thereby being able to adjust the oil suction area and the oil discharge area.

[0036] The rotatable member 106 includes an oil suction mating hole 1061. The oil suction mating hole 1061 is also formed as a continuous arc. Similarly, the rotatable member 106 further includes an oil discharge mating hole 1062. The oil discharge mating hole 1062 can also be formed as a plurality of arc-shaped short holes spaced apart from each other along an arc. For example, the size, shape, and positioning of the oil suction mating hole 1061 and / or the oil discharge mating hole 1062 are configured to respectively correspond to the oil suction hole 1051 and / or the oil discharge hole 1052 of the flow distribution plate 105, for example, being the same.

[0037] The rotatable member 106 may further include an oil guiding mating hole 1063. The positioning and the number of the oil guiding mating holes 1063 respectively correspond to the positioning and the number of the oil guiding through holes of the flow distribution plate 105, and the opening area of the oil guiding mating hole 1063 is larger than the opening area of the oil guiding through hole of the flow distribution plate 105. In this way, no matter how the rotatable member 106 rotates, the opening area of the oil guiding through hole can be made to be within the opening area of the oil guiding mating hole 1063. Figure 3 The rotatable member 106 shown in Figure 2 is adapted to be used in cooperation with the flow distribution plate shown in. As can be seen from the figure, in this exemplary embodiment, the rotatable member 106 may include two oil guiding mating holes 1063, corresponding to the first oil guiding through hole 1053a and the second oil guiding through hole 1053b respectively. The size of the oil guiding mating hole 1063 is configured to be slightly larger than the size of the oil guiding through hole with which it cooperates. Additionally, the oil guiding mating hole 1063 is configured as an independent through hole, that is to say, it is fluidically isolated from the corresponding oil suction mating hole 1061 or oil discharge mating hole 1062.

[0038] A mating notch 1064 is provided at the edge of the rotatable member 106, and it is configured to cooperate with the notch 1054 on the flow distribution plate 105. Details are as described below.

[0039] As Figure 4 shown, for example, as the rotatable member 106 rotates, when the mating notch 1064 and the notch 1054 are completely aligned, the rotatable member 106 completely exposes the flow distribution plate 105, and the oil discharge mating hole 1062 is completely aligned with the oil discharge hole 1052, making the oil discharge hole 1052 in a fully open state, thereby having the largest oil discharge area. Additionally, the oil suction mating hole 1061 is completely aligned with the oil suction hole 1051, making the oil suction hole 1051 in a fully open state, thereby having the largest oil suction area.

[0040] For another example, as the rotatable member 106 rotates, when the mating notch 1064 and the notch 1054 are partially misaligned, the rotatable member 106 partially blocks the flow distribution plate 105, and the oil discharge mating hole 1062 is partially misaligned relative to the oil discharge hole 1052, so that the oil discharge hole 1052 is in a partially closed state, thereby reducing the oil discharge area. Additionally, the oil suction mating hole 1061 is partially misaligned relative to the oil suction hole 1051, so that the oil suction hole 1051 is in a partially closed state, thereby reducing the oil suction area. In this way, the hydraulic oil in the opening 1031 of the cylinder block 103 can be "pressurized", thereby increasing the pressure in the opening 1031 and applied to the hydraulic oil, so as to push some hydraulic oil into the gap between the cylinder block 103 and the plunger 101, thereby promoting lubrication.

[0041] The flow distribution plate assembly may further include a connecting rod member 107 (as Figure 1 shown). The tail end of the connecting rod member 107 is pivotally connected to the swash plate 102. The tail end 107a of the connecting rod member 107 is formed into a wedge shape and configured to drive the rotation of the rotatable member 106. For example, when the tilt angle of the swash plate 102 decreases, the head end 107b of the connecting rod member 107 increases the misalignment distance between the mating notch 1064 and the notch 1054 of the rotatable member to block the oil discharge hole 1052, thereby reducing the oil discharge area.

[0042] The flow distribution plate assembly may further include a positioning pin 108. The positioning pin 108 may be configured to hold the flow distribution plate 106 in place when the rotatable member 106 rotates. In this way, it is possible to prevent the rotatable member 106 from driving the flow distribution plate (e.g., via frictional force) to cause unwanted rotation.

[0043] The flow distribution plate assembly may further include a reset member 109 used in cooperation with the connecting rod member 107, for example, implemented as a reset spring, as Figure 4 shown. The reset member 109 may be configured such that when the tilt angle of the swash plate 102 increases, the reset member 109 reduces the misalignment distance between the mating notch 1064 and the notch 1054 of the rotatable member to expose the oil discharge hole 1052, thereby increasing the oil discharge area.

[0044] In an exemplary embodiment, the axial piston pump disclosed in the present application is a low-speed piston pump.

[0045] As used herein, the term "comprising" is open-ended and includes one or more stated features, elements, components, or functions, but does not exclude the presence or addition of one or more other features, elements, components, functions, or combinations thereof.

[0046] The above description of the embodiments of the present application has been provided for purposes of illustration and description. This is not intended to be exhaustive or to limit the utility model to the precise forms disclosed. Within the scope of the present application, it will be appreciated that the various aspects, embodiments, examples, and alternatives set forth in the foregoing paragraphs, claims, and / or in the specification and drawings, particularly their individual features, may be taken independently or in any combination. That is, all embodiments and / or features of any embodiment may be taken in any manner and / or combination, unless such features are incompatible. It will be appreciated that many modifications and variations are available to those skilled in the art. The embodiments are chosen and described in order to properly explain the principles of the utility model and its practical application, so that others skilled in the art can understand the various embodiments of the utility model and the various modifications suitable for the particular purposes contemplated. The applicant reserves the right to change any originally filed claims accordingly or to file any new claims, including modifying any originally filed claim to depend on and / or incorporate any feature of any other claim, even though originally not claimed in such manner.

Claims

1. A valve plate assembly for an axial piston pump, characterized in that: include: A distribution plate (105); a rotatable member (106) which is arranged to be closely attached to the port plate (105) and can be positioned on the opposite side relative to the cylinder body (103) of the plunger pump, The rotatable component (106) is configured to be rotatable relative to the distribution plate (105) to partially block and expose the oil suction hole (1051) and the oil discharge hole (1052) of the distribution plate (105), so that the pressure of the hydraulic oil applied between the opening (1031) of the cylinder body (103) and the plunger (101) increases, thereby pushing the hydraulic oil to move axially toward the swash plate (102) of the axial piston pump, thereby promoting lubrication between the cylinder body (103) and the plunger (101).

2. The valve plate assembly for an axial piston pump according to claim 1, characterized in that: The rotatable component (106) comprises an oil suction matching hole (1061) and an oil discharge matching hole (1062), and the size, shape and positioning of the oil suction matching hole (1061) and the oil discharge matching hole (1062) are configured to correspond to the oil suction hole (1051) and the oil discharge hole (1052) of the distribution plate (105), respectively.

3. The valve plate assembly for an axial piston pump according to claim 2, characterized in that: The oil suction matching hole (1061) is formed into a continuous arc shape, and the oil discharge matching hole (1062) is formed into a plurality of arc-shaped short holes spaced a certain distance from each other along the arc line.

4. The valve plate assembly for an axial piston pump according to claim 3, characterized in that: A notch (1054) is provided at the edge of the distribution plate (105), and correspondingly, a matching notch (1064) is provided at the edge of the rotatable component (106); In which, when the matching notch (1064) and the notch (1054) are completely aligned, the rotatable component (106) completely exposes the distribution plate (105), and the oil drain matching hole (1062) is completely aligned with the oil drain hole (1052), so that the oil drain hole (1052) is in a fully open state, thereby maximizing the oil drain area.

5. The valve plate assembly for an axial piston pump according to claim 4, characterized in that: The oil suction matching hole (1061) is completely aligned with the oil suction hole (1051), so that the oil suction hole (1051) is in a fully open state, thereby maximizing the oil suction area.

6. The valve plate assembly for an axial piston pump according to claim 4 or 5, characterized in that: When the mating recess (1064) and the recess (1054) are partially misaligned, the rotatable component (106) partially blocks the distribution plate (105), and the oil drain mating hole (1062) is partially misaligned relative to the oil drain hole (1052), so that the oil drain hole (1052) is in a partially closed state, thereby reducing the oil drain area.

7. The valve plate assembly for an axial piston pump according to claim 6, characterized in that: The oil suction fitting hole (1061) is partially offset relative to the oil suction hole (1051), so that the oil suction hole (1051) is in a partially closed state, thereby reducing the oil suction area.

8. The valve plate assembly for an axial piston pump according to claim 7, characterized in that: Also includes: A connecting rod member (107), wherein the rear end of the connecting rod member (107) is pivotally connected to the swash plate (102), and the head end of the connecting rod member (107) opposite to the rear end is formed into a wedge shape and configured to drive the rotation of the rotatable component (106).

9. The valve plate assembly for an axial piston pump according to claim 8, characterized in that: When the inclination angle of the swash plate (102) is reduced, the head end of the connecting rod (107) increases the misalignment distance between the matching recess (1064) of the rotatable component (106) and the recess (1054) of the distribution plate (105), thereby blocking the oil discharge hole (1052) and reducing the oil discharge area.

10. The valve plate assembly for an axial piston pump according to claim 8 or 9, characterized in that: The invention also includes a reset member (109), wherein the reset member (109) is configured such that when the inclination angle of the swash plate (102) increases, the reset member (109) reduces the misalignment distance between the matching recess (1064) of the rotatable component (106) and the recess (1054) of the distribution plate (105), thereby exposing the oil drain hole (1052) and increasing the oil drain area.

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