Drum-shaped spline connecting mechanism applied to high-speed plunger pump

Abstract

The utility model relates to a hydraulic pump, in particular to a drum-shaped spline connecting mechanism applied to a high-speed plunger pump, which comprises external splines arrayed on the periphery of a driving shaft and internal splines arranged in a cylinder body and / or a spherical hinge and matched with the external splines. The profile of the outer spline and the profile of the inner spline at any position in the radial direction are both in a drum shape. Compared with the prior art, the drum-shaped spline connecting mechanism is adopted, a transmission solution which is high in stability, high in bearing capacity and long in service life is provided for the high-speed plunger pump, and development of the field of new energy engineering machinery is promoted.

Description

TECHNICAL FIELD

[0001] The utility model relates to a hydraulic pump, concretely is a drum spline connecting mechanism for high -speed plunger pump. BACKGROUND

[0002] In the field of engineering machinery, as a key hydraulic power element, the performance of the plunger pump directly affects the working effect of the entire hydraulic system. The traditional plunger pump mainly relies on the drive of the internal combustion engine, and the speed is relatively low, but it can provide larger flow. With the development of technology, especially the release of " Engineering Machinery Industry's 14th Five-Year Development Plan", new energy engineering machinery electrification has become an important trend of industry development. The promotion of electrification makes the electric motor gradually replace the internal combustion engine to become the driving force of the plunger pump.

[0003] Compared with the internal combustion engine, the most effective way for the electric motor to improve the power density is to increase the speed. Therefore, the plunger pump must also adapt to the high-speed characteristics of the electric motor. Compared with the traditional plunger pump, the high-speed plunger pump has the advantages of fast response speed, high power-to-weight ratio, more compact structure and lower cost. However, with the increase of speed, the plunger pump faces new challenges in design and manufacturing: due to the centrifugal force generated by high-speed rotation, the radial force that the parts in the pump will bear is significantly increased, which not only may cause the tilting of the shoe, but also may cause the bending and strong vibration of the transmission components, thereby affecting the stability and life of the pump.

[0004] Among them, the high-speed plunger pump applied to the high-speed drive of the electric motor faces the following problems:

[0005] ① Due to the centrifugal force generated by high-speed rotation, the key components such as shoes are prone to tilting. ② The transmission components need to bear a large radial force, which is prone to bending and strong vibration. ③ The spline connecting mechanism of the traditional plunger pump is prone to unstable connection and accelerated wear at high speed. The above problems limit the application and development of high-speed plunger pumps in the field of new energy engineering machinery. INVENTION CONTENTS

[0006] In order to solve the third problem, a new type of connecting mechanism needs to be developed, which can maintain stability under high-speed operation, and has high torque transmission capacity and good wear resistance. For this purpose, the technical scheme adopted by the utility model is:

[0007] A drum spline connecting mechanism applied to a high-speed plunger pump, comprising an outer spline arranged in an array on the outer periphery of the drive shaft, and an inner spline arranged in the cylinder body and / or ball hinge and matched with the outer spline, and different from the prior art, the cross-sectional profile of the outer spline and the inner spline at any position in the radial direction is drum-shaped.

[0008] Further, if the tooth length of the external spline and the internal spline is defined as B, and the radius of the two side circular arc surfaces is C, then C / B>12.

[0009] Further, the number of teeth of the external spline and the internal spline is odd.

[0010] Further, the end face of the external spline and the internal spline is a circular arc surface with a bulge in the middle.

[0011] Further, if the root radius of the external spline and the internal spline is C0, and the end face radius is Cr, then Cr / C0>6.

[0012] Further, the surface of the external spline and the internal spline each contains a layer of carburized layer or nitrided layer.

[0013] Further, a sealing structure is arranged between the cylinder and / or the spherical hinge at both ends of the internal spline and the driving shaft where the external spline is located.

[0014] Further, the tooth shape of the internal spline and the internal spline is involute type.

[0015] Further, the tooth top and tooth root of the internal spline and the internal spline are chamfered.

[0016] Further, the fitting gap between the two side circular arc surfaces of the internal spline and the internal spline is a trace of interference.

[0017] Compared with the prior art, the beneficial technical effects of the utility model mainly lie in the following aspects:

[0018] 1. Improve transmission stability: The drum-shaped profile design of the drum-shaped spline helps to maintain stable transmission under high speed operation, and its unique shape can provide better tooth surface contact, thereby reducing vibration and noise and improving the stability and reliability of the entire plunger pump system.

[0019] 2. Enhance load carrying capacity: The drum-shaped spline, due to its unique bulging shape, can withstand greater torque and radial force compared to traditional straight toothed splines, which allows the plunger pump to maintain efficient operation under high load conditions.

[0020] 3. Optimize load distribution: The design of the drum-shaped spline makes the load more evenly distributed on the tooth surface, which can reduce tooth surface wear caused by load concentration and prolong the service life of the spline.

[0021] 4. Compensate for installation errors: The drum-shaped spline has certain axial, radial and angular offset compensation capability, which means that even if there is some error in the installation process, the drum-shaped spline can adjust itself to some extent to ensure the smoothness and continuity of the transmission.

[0022] 5. Improved manufacturing precision and assembly efficiency: By using high-precision CNC gear hobbing machines for tooth profile machining, the machining precision of the drum spline can reach IT6-IT7 level, which helps to improve the manufacturing precision of the product. At the same time, the design of the drum spline also helps to simplify the assembly process and improve the assembly efficiency.

[0023] 6. Reduced maintenance cost: Due to the high stability and long service life of the drum spline, the maintenance frequency and cost of the plunger pump during operation can be effectively reduced, saving the user's long-term operating cost.

[0024] 7. Adapt to high-speed operation: In view of the specific needs of high-speed plunger pumps, the design of the drum spline can effectively cope with the centrifugal force generated by high-speed rotation, reduce the risk of sliding shoe overturning, and improve the durability of the transmission components.

[0025] In summary, the utility model provides a high-stability, high-load-carrying capacity, and long-service-life transmission solution for high-speed plunger pumps through the use of drum spline connection mechanism, which helps to promote the development of new energy engineering machinery field. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic diagram of the utility model.

[0027] Figure 2 is a structural schematic diagram of the utility model drive shaft.

[0028] Figure 3 is a structural schematic diagram of the utility model cylinder.

[0029] Figure 4 is a structural schematic diagram of the utility model ball hinge.

[0030] Figure 5 is a structural schematic diagram of the utility model outer spline after exaggeration.

[0031] Figure 6 is Figure 5 the cross-sectional view of A-A in the figure.

[0032] Figure 7 is Figure 5 the cross-sectional view of B-B in the figure.

[0033] Figure 8 is a structural schematic diagram of the utility model inner spline after exaggeration.

[0034] Figure 9 is Figure 8 the cross-sectional view of C-C in the figure.

[0035] Figure 10 is Figure 8 the cross-sectional view of D-D in the figure. DETAILED DESCRIPTION

[0036] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or position relation based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the indicated device or element must have a particular orientation, construct and operate in a particular orientation, therefore cannot be understood as the limitation of the utility model.

[0037] In the description of the utility model, it needs to explain, unless another explicit provision and limitation, the term "installation", "connection", "communication" should be broad sense, for example, can be fixed connection, can be detachable connection, or integrally connected;Can be mechanical connection, can be electrical connection;Can be directly connected, can be indirectly connected through intermediate medium, can be the communication inside two elements.For ordinary skilled person in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0038] The following specific embodiments illustrate the embodiments of the utility model, the person skilled in the art can easily understand other advantages and effects of the utility model from the content disclosed in the specification, obviously, the described embodiment is a part of the embodiment of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary skilled person in the art without creative labor belong to the scope of protection of the utility model.

[0039] As Figures 1-4 The utility model discloses a drum spline connection mechanism applied to high speed plunger pump, including the outer spline 1 of the driving shaft 100 periphery array, set up in the inner spline 2 with the cooperation of the outer spline 1 in cylinder body 200 and / or ball hinge 300, the profile of the outer spline 1 and inner spline 2 in any position in radial direction is drum-shaped.

[0040] Because the drum shape of the outer spline 1 and inner spline 2 is very small in actuality, it is difficult to observe with naked eye, therefore, the outer spline 1 and inner spline 2 are exaggerated, as shown in Figures 5-10 If the tooth length of the outer spline 1 and inner spline 2 is defined as B, and the radius of the two side arc surfaces is C, then C / B>30.

[0041] C / B>30, which means that the tooth profile shape of the drum spline is close to the traditional straight spline, but there is a small degree of drumming. According to research, the load sharing of the drum spline in the misalignment state is significant, and the contact stress is reduced, which helps to reduce the stress concentration on the tooth surface, thereby reducing the risk of tooth fracture. Drum spline can better compensate for misalignment caused by manufacturing or installation errors, which is particularly important in high-speed or precision applications, because misalignment will affect the smoothness and efficiency of transmission. The drumming design of the drum spline can improve its carrying capacity, especially when subjected to high-speed loads. The drumming design helps to distribute the load and reduce the wear of the tooth surface. Due to its unique tooth profile shape, the drum spline can absorb and disperse vibrations generated by high-speed rotation, thereby reducing system vibration and noise. The design of the drum spline helps to reduce the transmission instability caused by manufacturing and assembly errors, thereby improving the transmission accuracy and efficiency of the entire system. Reasonable drumming amount range can quantitatively couple the backlash, misalignment compensation ability and modification amount, which helps to improve the service life of the drum spline.

[0042] In another preferred embodiment, the end faces of the outer spline 1 and the inner spline 2 are circular arc surfaces with a central drum. If the root radius of the outer spline 1 and the inner spline 2 is defined as C0, and the end face radius is defined as Cr, then Cr / C0>20. The beneficial effects are similar to the drumming design of the two side faces, which provides additional performance advantages for the drum spline connection mechanism of the high-speed piston pump, enabling it to operate efficiently and stably under high-speed and high-load working conditions. No longer mentioned.

[0043] In another preferred embodiment, the number of teeth of the outer spline 1 and the inner spline 2 is odd. Odd tooth design helps to reduce vibration during transmission. This is because the vibration torque generated by the odd tooth spline during meshing can partially cancel each other out, thereby reducing the overall vibration level

[0044] In another preferred embodiment, the surfaces of the outer spline 1 and the inner spline 2 each include a carburized layer or a nitrided layer. Carburizing or nitriding the surface of the outer spline 1 and the inner spline 2 can significantly improve the surface performance of the parts, including hardness, wear resistance, fatigue strength and corrosion resistance, without sacrificing the toughness of the base body, thereby prolonging the service life of the parts and improving the reliability and stability of the system.

[0045] In another preferred embodiment, a sealing structure is arranged between the cylinder body 200 and / or the spherical hinge 300 at both ends of the inner spline 2 and the drive shaft where the outer spline 1 is located. By setting a sealing structure at the key position, the problem of lubricating oil leakage and external impurities intrusion is effectively solved, improving the reliability and maintainability of the drum spline connection mechanism, which is of great significance to improve the stability and service life of the entire piston pump system.

[0046] In another preferred embodiment, the inner spline 2 and the tooth profile of the inner spline 2 are involute. The involute tooth profile has the feature of keeping constant transmission ratio during meshing, which helps to achieve smooth and impact-free transmission, reduce vibration and noise.

[0047] In another preferred embodiment, the inner spline 2 and the tooth top and tooth root of the inner spline 2 are chamfered. The chamfering of the tooth top and tooth root can reduce the stress concentration in these areas and avoid fatigue cracks and early failure caused by stress concentration.

[0048] In another preferred embodiment, the fit clearance between the two side arc surfaces of the inner spline 2 is a slight interference. The drum spline connection mechanism with slight interference fit can improve the stability and durability of the system while ensuring the connection strength and reliability, which is particularly important for high-precision and high-reliability applications such as high-speed piston pumps.

[0049] Although the present application has been described in detail above with general description and specific embodiments, some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the present application, all belong to the scope of protection required by the present application.

[0050] The parts not described in detail in the present application are the existing technology or common knowledge in the art.

Claims

1. A drum spline connection mechanism applied to a high-speed plunger pump, comprising outer splines (1) in a peripheral array on a drive shaft (100), and inner splines (2) arranged in a cylinder block (200) and / or a ball hinge (300) to cooperate with the outer splines (1), characterized in that, The profile of the outer spline (1) and the inner spline (2) in any radial position is drum-shaped.

2. A drum spline connection mechanism applied to a high-speed plunger pump according to claim 1, characterized in that, If the tooth length of the outer spline (1) and the inner spline (2) is defined as B, and the radius of the two side arc surfaces is C, then C / B>30.

3. A drum spline coupling mechanism for use in a high speed piston pump as claimed in claim 1, wherein, The end face of the outer spline (1) and the inner spline (2) is a central drum-shaped arc surface.

4. A drum spline coupling mechanism for use in a high speed piston pump according to claim 3, wherein If the root radius of the outer spline (1) and the inner spline (2) is defined as C0, and the end face radius is Cr, then Cr / C0>20.

5. A drum spline coupling mechanism for use in a high speed piston pump as claimed in claim 1, wherein, The number of teeth of the outer spline (1) and the inner spline (2) is odd.

6. A drum spline coupling mechanism for use in a high speed piston pump as claimed in claim 1, wherein, The surface of the outer spline (1) and the inner spline (2) comprises a layer of carburized layer or nitrided layer.

7. A drum spline coupling mechanism for use in a high speed piston pump as claimed in claim 1, wherein, The cylinder (200) and / or spherical hinge (300) at both ends of the inner spline (2) and the driving shaft of the outer spline (1) are provided with a sealing structure.

8. A drum spline coupling mechanism for use in a high speed piston pump as claimed in claim 1, wherein, The tooth profile of the inner spline (2) and the inner spline (2) is involute.

9. A drum spline coupling mechanism for use in a high speed piston pump as claimed in claim 1, wherein, The tooth top and tooth root of the inner spline (2) and the inner spline (2) are chamfered.

10. A drum spline coupling mechanism for use in a high speed piston pump as claimed in claim 1, wherein, The fitting gap between the two side arc surfaces of the inner spline (2) and the inner spline (2) is a trace of interference.

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