Swash plate ejector rod mounting structure

Abstract

The utility model relates to the field of plunger pumps, in particular to a swash plate ejector rod installation structure which comprises a swash plate and an ejector rod, a ball chamber is arranged on the upper portion of the swash plate, a ball head is arranged at one end of the ejector rod, an installation hole and a limiting hole are formed in the front side of the swash plate, the installation hole intersects with the limiting hole, and the installation hole is located on the upper portion of the limiting hole. The mounting hole and the limiting hole extend into the ball chamber, the ejector rod penetrates through the mounting hole and / or the limiting hole, the ball head is located in the ball chamber, a limiting edge is arranged on the ball head, the diameter of the mounting hole is larger than that of the limiting edge, the diameter of the limiting hole is smaller than that of the limiting edge, the ball head comprises a ball seat, and the ball seat is located at the upper end of the ejector rod and provided with two circular truncated cones; the end faces of the two circular truncated cones are connected, the limiting edge is located on the outer edge where the two end faces are connected, a ball cap is arranged on the upper portion of the ball seat, the ball cap is in a hemisphere shape smaller than a half of a sphere, and the swash plate ejector rod installation structure can achieve stable installation, low-friction movement and high reliability of an ejector rod and is suitable for plunger pumps under high-pressure and high-frequency working conditions.

Description

Technical Field

[0001] This utility model relates to the field of plunger pumps, specifically to a swashplate push rod mounting structure. Background Technology

[0002] As a common hydraulic power unit, the swashplate piston pump's power adjustment mechanism typically achieves its power by changing the swashplate's tilt angle. The push rod, as a key transmission component between the swashplate and the control mechanism, is traditionally fixed in the swashplate ball chamber by press-fitting or a snap ring. During operation, the control mechanism uses the push rod to push or pull the swashplate, changing its tilt angle and thus adjusting the piston pump's power. The reliability of its mounting structure directly affects the swashplate's motion accuracy and the system's stability.

[0003] Traditional ball joint installation methods mainly include: pressing the ball joint into the ball chamber through the opening after cryogenic treatment; installing the ball joint in the ball chamber with a retaining spring; or using a ball joint to connect the ball joint and the ball chamber. These methods are not only structurally complex and inefficient, but also prone to surface damage due to interference fits, affecting the flexibility of movement, and therefore require improvement. Utility Model Content

[0004] The purpose of this invention is to provide a slant plate top rod installation structure that is easy to install and flexible in operation, in order to address the above problems.

[0005] To achieve the above objectives, this utility model discloses a swashplate and push rod mounting structure, including a swashplate and a push rod. The upper part of the swashplate is provided with a ball chamber, and one end of the push rod is provided with a ball head. Its structural features are: the front side of the swashplate is provided with a mounting hole and a limiting hole, the mounting hole and the limiting hole intersect, the mounting hole is located above the limiting hole, and both the mounting hole and the limiting hole extend into the ball chamber. The push rod passes through the mounting hole and / or the limiting hole, the ball head is located in the ball chamber, and the ball head is provided with a limiting ridge. The diameter of the mounting hole is larger than the diameter of the limiting ridge, and the diameter of the limiting hole is smaller than the diameter of the limiting ridge.

[0006] When installing the push rod, tilt the push rod so that the ball head is inserted into the ball chamber through the mounting hole. When the plunger pump changes from minimum power to maximum power, the top part of the ball head pushes the swashplate, and the swashplate gradually tilts. At this time, the relative angle between the push rod and the swashplate changes, and the push rod enters the limiting hole. When the plunger pump changes from maximum power to minimum power, the push rod moves in the opposite direction. Since the diameter of the limiting hole is smaller than the diameter of the limiting edge, the ball head in the ball chamber is limited by the limiting hole and cannot leave the ball chamber. The ball head pulls the swashplate back to the center. By using the intersecting mounting holes and limiting holes, the ball head will not be damaged during the installation process, and flexible installation and fixed limiting of the push rod can be achieved.

[0007] The ball head includes a ball seat located at the top of the push rod. The ball seat has two frustums connected at their end faces. The limiting edge is located at the outer edge where the two end faces connect. The limiting edge is the part of the ball head with the largest diameter, ensuring a reliable fit with the limiting hole.

[0008] The two conical frustums have the same surface area when connected, and the symmetrical structure ensures that the ball head is subjected to uniform force.

[0009] The ball seat is equipped with a ball cap on the upper part. The ball cap is a hemisphere that is less than half the size of a sphere. The spherical contact reduces the sliding friction resistance with the ball chamber, making it easier for the ball head to adaptively adjust its angle inside the ball chamber.

[0010] The bottom of the ball chamber is equipped with a ball groove, the shape and size of which are adapted to the top of the ball cap. This increases the contact area and reduces contact stress.

[0011] The bottom of the ball groove is equipped with a pressure relief hole to prevent the ball cap and the ball groove from sticking due to excessive pressure, thus ensuring the flexibility of their movement.

[0012] The mounting hole and the limiting hole have two intersecting common points. The distance between the two common points is greater than the diameter of the push rod. The mounting hole and the limiting hole are on the same plane, which can determine the relative size of the mounting hole and the limiting hole, making the machining positioning more accurate and ensuring that the limiting edge is reliably clamped.

[0013] The diameter of the limiting edge is larger than the diameter of the push rod. The limiting edge is the part with the largest diameter on the ball head, ensuring a reliable fit with the limiting hole.

[0014] In summary, the beneficial effects of this utility model are as follows: by setting mounting holes and limiting holes on the swashplate and adopting a structure of two intersecting circles, stable installation of the push rod, low-friction movement and high reliability can be achieved; by setting pressure relief holes at the bottom of the ball groove, the ball cap and the ball groove are prevented from sticking due to excessive pressure, ensuring the flexibility of their movement, and it is suitable for plunger pumps in high-pressure and high-frequency operating conditions. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the swashplate and push rod assembly.

[0016] Figure 2 This is a cross-sectional structural diagram of the swashplate and push rod;

[0017] Figure 3 This is a structural diagram of the mounting holes and the limiting holes;

[0018] Figure 4 for Figure 3 A magnified schematic diagram of the local structure at point B;

[0019] Figure 5 For along Figure 3 Schematic diagram of the cross-sectional structure along line AA;

[0020] Figure 6 for Figure 5 A magnified view of the structure at point C in the middle;

[0021] Figure 7 This is a schematic diagram of the top rod structure;

[0022] Figure 8 This is a schematic diagram of the axial structure of the swashplate.

[0023] In the diagram: swash plate 1, push rod 2, ball chamber 3, mounting hole 4, limiting hole 5, ball head 6, limiting edge 7, ball seat 8, ball cap 9, ball groove 10, pressure relief hole 11, frustum 12. Detailed Implementation

[0024] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0025] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0026] 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 technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0029] A swashplate push rod mounting structure includes a swashplate 1 and a push rod 2. The upper part of the swashplate 1 has a ball chamber 3. One end of the push rod 2 has a ball head 6. The front side of the swashplate 1 has a mounting hole 4 and a limiting hole 5, which intersect. The mounting hole 4 is located above the limiting hole 5. Both the mounting hole 4 and the limiting hole 5 extend into the ball chamber 3. The push rod 2 passes through the mounting hole 4 and / or the limiting hole 5. The ball head 6 is located in the ball chamber 3 and has a limiting ridge 7. The diameter of the mounting hole 4 is larger than the diameter of the limiting ridge 7, and the diameter of the limiting hole 5 is smaller than the diameter of the limiting ridge 7. (See attached diagram.) Figure 1 When installing push rod 2, tilt push rod 2 so that ball head 6 is inserted into ball chamber 3 through mounting hole 4. When the plunger pump changes from minimum power to maximum power, the top part of ball head 6 pushes swashplate 1, and swashplate 1 gradually tilts. At this time, the relative angle between push rod 2 and swashplate 1 changes, and push rod 2 enters limiting hole 5. When the plunger pump changes from maximum power to minimum power, push rod 2 moves in the opposite direction. Since the diameter of limiting hole 5 is smaller than the diameter of limiting edge 7, ball head 6 in ball chamber 3 is limited by limiting hole 5 and cannot get out of ball chamber 3. Ball head 6 pulls swashplate 1 back to center. By using the intersecting mounting hole 4 and limiting hole 5, push rod 2 can be flexibly installed and fixedly limited.

[0030] See attached document Figure 2 Appendix Figure 7 The ball head 6 includes a ball seat 8, located at the upper end of the top rod 2. The ball seat 8 has two frustums 12, whose end faces are connected. A limiting edge 7 is located at the outer edge where the two end faces connect, and the limiting edge 7 is the part with the largest diameter on the ball head 6, ensuring reliable engagement with the limiting hole 5. The end faces of the two frustums 12 have the same area, and the symmetrical structure ensures uniform force distribution on the ball head 6. A ball cap 9 is provided on the upper part of the ball seat 8. The ball cap 9 is a hemispherical shape less than half the size of a sphere. The spherical contact reduces the sliding friction resistance with the ball chamber 3, facilitating the adaptive adjustment of the angle of the ball head 6 within the ball chamber 3.

[0031] See attached document Figure 6 The bottom of the ball chamber 3 is provided with a ball groove 10, the shape and size of which are adapted to the top of the ball cap 9. This increases the contact area and reduces contact stress. The bottom of the ball groove 10 is provided with a pressure relief hole 11 to prevent the ball cap 9 and the ball groove 10 from sticking due to excessive pressure, thus ensuring the flexibility of their movement.

[0032] See attached document Figure 4The mounting hole 4 and the limiting hole 5 have two intersecting common points, the distance between which is greater than the diameter of the push rod 2. The mounting hole 4 and the limiting hole 5 are on the same plane, allowing for the determination of their relative sizes and the positional relationship of their two intersecting circles. This makes machining and positioning more precise and ensures that the limiting edge 7 is reliably engaged. The diameter of the ball head 6 is greater than the diameter of the push rod 2, and the diameter of the limiting edge 7 is also greater than the diameter of the push rod 2. The limiting edge 7 is the part with the largest diameter on the ball head 6, ensuring a reliable fit with the limiting hole 5.

[0033] In this embodiment, the diameter of the mounting hole 4 is 10.9 mm, the diameter of the limiting hole 5 is 10.5 mm, and the diameter of the limiting ridge 7 is 10.7 mm. The ball head 6 can be inserted into the 10.9 mm mounting hole 4, but will be restricted by the 10.5 mm limiting hole 5.

[0034] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A swashplate and push rod mounting structure, comprising a swashplate (1) and a push rod (2), wherein a ball chamber (3) is provided on the upper part of the swashplate (1), and a ball head (6) is provided at one end of the push rod (2), characterized in that, The front side of the swash plate (1) is provided with a mounting hole (4) and a limiting hole (5). The mounting hole (4) and the limiting hole (5) intersect. The mounting hole (4) is located above the limiting hole (5). Both the mounting hole (4) and the limiting hole (5) extend into the ball chamber (3). The push rod (2) passes through the mounting hole (4) and / or the limiting hole (5). The ball head (6) is located in the ball chamber (3). The ball head (6) is provided with a limiting ridge (7). The diameter of the mounting hole (4) is larger than the diameter of the limiting ridge (7). The diameter of the limiting hole (5) is smaller than the diameter of the limiting ridge (7).

2. The swash plate top rod mounting structure according to claim 1, wherein The ball head (6) includes a ball seat (8), which is located at the upper end of the top rod (2). The ball seat (8) has two frustums (12), the end faces of which are connected, and the limiting edge (7) is located at the outer edge where the two end faces are connected.

3. The swash plate top rod mounting structure according to claim 2, wherein The end faces of the two frustums (12) that are connected have the same area.

4. The swash plate top rod mounting structure according to claim 2, wherein The ball seat (8) is provided with a ball cap (9) on the upper part, and the ball cap (9) is a hemisphere less than half the size of a sphere.

5. The swash plate top rod mounting structure according to claim 4, wherein The bottom of the ball chamber (3) is provided with a ball groove (10), the shape and size of which are adapted to the top of the ball cap (9).

6. The swash plate top rod mounting structure according to claim 5, wherein The bottom of the ball groove (10) is provided with a pressure relief hole (11).

7. The swash plate top rod mounting structure according to claim 1, wherein The mounting hole (4) and the limiting hole (5) have two intersecting common points, and the distance between the two common points is greater than the diameter of the top rod (2).

8. The swash plate top rod mounting structure according to claim 1, wherein The diameter of the limiting edge (7) is greater than the diameter of the top rod (2).

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