Asymmetrical curvilinear involute profile gear

Abstract

The invention relates to the asymmetrical curvilinear involute profile gear (10) used in external gear pumps, which reduces flow fluctuation and, thus, noise level, reduces cavitation phenomenon, and ensures efficient operation.

Description

[0001] Asymmetrical curvilinear involute profile gear

[0002] Field of the Invention

[0003] The invention generally relates to gears and gear pumps used in various fields in the machinery industry.

[0004] The invention particularly relates to an asymmetrical curvilinear involute profile gear used in external gear pumps. This gear reduces flow fluctuation and, thus, noise level, reduces cavitation phenomenon, and ensures efficient operation.

[0005] State of the Art

[0006] Today, gears are used in the machinery industry to transmit or convert torque and speed. Gears can have various profiles or structures depending on the machine to be used and the purpose of use in the machine.

[0007] In the current technique, flat involute profiles are used in gear pumps. It is generally known that the volumetric efficiency of this type of pump is between 90-98%. Due to its easy production and low production costs, gears with this profile are widely used in gear pumps. However, flow fluctuation, noise level, and cavitation phenomenon in these gears are disadvantages. Some studies aim to increase flow fluctuation and volumetric flow in gear pumps.

[0008] One of the applications used in the known state of the art is half-tooth profile gears. Half-tooth profiles are a recently developed gear profile for external gear pumps. With these profiles, the volumetric flow rate in gear pumps has increased. In addition, they significantly reduce flow fluctuation compared to straight gear profiles and are superior to straight gears. However, in this application, half-tooth profiles are not curved. This causes less contact between teeth in gear pump applications and, as a direct result, increased wear and high-stress concentrations on the contact surfaces of the teeth. This shortens the life of gear pumps and increases the need for maintenance. Another application developed in the state of the art is gears produced in curvilinear profiles. Another method to increase gear fluid flow in external gear pumps is adding curvature to the circular tooth profile. Similarly, both volumetric flow rate advantages are provided compared to gear pumps with flat involute profiles, and operating noise levels are reduced to lower. However, curvature in this application is not applied to the involute profile. When curvature is not used for a flat involute profile, the teeth deviate from ideal meshing (grip) conditions during the interaction. This situation leads to uneven force distribution between the teeth and increased mechanical stresses. As a result, the wear rate of gear pumps increases, shortening the pumps' life. In addition, due to non-ideal meshing conditions, noise and vibration levels generated during fluid pumping can be higher than expected. These negativities negatively affect the efficiency and operational performance of the pumps and increase maintenance and repair costs.

[0009] The document numbered W02020086699A2 encountered in the state of the art deals with curvilinear-arc gears to be used in gear pumps. This document mentions using curvilinear-arc gears that increase gear performance and reduce noise while avoiding axial loads standard in helical gears. However, the gear profile used in this document is not involute and is not a half-tooth. When the profile and curvature of the structure are considered, it is seen that special tools are used to produce the structure and that production processes requiring expertise are involved. This situation increases production costs. In addition, since no optimum value study has been done for curvature, it potentially affects efficiency and requires a more precise alignment during assembly. Since the structure is not a half-tooth, the transmission volume will be less, and the pump will be relatively heavier than a half-tooth gear.

[0010] The document numbered JPH04175556A covers a magnetic gear. This document generally mentions that gears repel each other with a magnetic force. In this configuration, it is noted that some gears have a half-tooth structure to provide magnetic communication. However, the gear profile in this document does not have a curvilinear involute structure. The fact that the gear profile in magnetic gears is not in a curvilinear involute structure can cause some restrictions in optimizing the interaction of magnetic fields and, therefore, power transmission. Curvilinear involute profiles can improve the contact between teeth and the magnetic force transmission, thus providing more efficient and quiet operation. In addition, increased mechanical stresses and wear risks arise due to inconsistencies in the interaction between magnetic gears and irregular distribution of magnetic fields. These situations negatively affect the overall performance and life of the magnetic gear system.

[0011] As a result, improvements are being made to the gear wheels used in external gear pumps. Therefore, new structures are needed to eliminate the disadvantages and provide solutions to existing systems.

[0012] Aim of the Invention

[0013] The present invention relates to an asymmetrical curvilinear involute profile gear that meets the abovementioned requirements, eliminates all disadvantages, and provides additional advantages.

[0014] The primary purpose of the invention is to reduce flow fluctuation and noise levels in external gear pumps, reduce cavitation inside the pump, and increase the volumetric flow rate.

[0015] One purpose of the invention is to provide more efficient operation by solving the above problems.

[0016] To realize all the advantages mentioned above and understood from the detailed explanation below, the present invention is a gear with teeth formed on it, used in external gear pumps, reducing flow fluctuation and thus noise level, reducing cavitation phenomenon and also providing efficient operation;

[0017] An involute profile structure, formed as half in an asymmetrical structure, and • A structure containing teeth formed curvilinearly from one edge of the gear to the other edge in a correct radius of curvature has been obtained.

[0018] The figures below and the detailed explanation referencing them will help you understand the invention's structural and characteristic features and all its advantages more clearly. Therefore, the evaluation should consider these figures and detailed explanations.

[0019] Figures Clarifying the Invention

[0020] In order to best understand the structure of the present invention and its advantages together with the additional elements, it should be evaluated together with the figures explained below.

[0021] Figure 1 : The subject of the invention is a side-sectional view of the gear.

[0022] Figure 2: The subject of the invention is a top view of the gears.

[0023] Figure 3: The subject of the invention is a representative perspective showing the gear application method.

[0024] Figure 4: The subject of the invention is a representative top view showing the gear application method.

[0025] Elements Helping to Understand Figures

[0026] 10. Gear

[0027] 11 . Gear teeth

[0028] Detailed Description of the Invention

[0029] In this detailed explanation, the preferred embodiments of the gear (10), which is the subject of the invention, are explained only to better understand the subject and in a way that does not create any limiting effect. The invention is a gear (10) which is used in external gear pumps, reduces flow fluctuation and thus noise level, reduces cavitation phenomenon and also provides efficient operation, and includes teeth (11 ) formed on it;

[0030] • It contains teeth (11) which have an involute profile structure, are formed as half in an asymmetric structure, and

[0031] • are formed curvilinearly in a radius of curvature from one edge of the gear wheel (11 ) to the other.

[0032] Figure 1 and Figure 2 show the side and top views of the gear (10), which is the subject of the invention. The teeth (11) of the gear (10) have an involute profile structure and are formed as an asymmetric half tooth (11 ) in a way that they will cut from the center of the gear (10) to the tip (Figure 1 ). At the same time, the teeth (11) mentioned are produced in a curvilinear form with a certain radius of curvature from one side edge of the gear (10) to the other side edge (Figure 2).

[0033] Figure 3 and Figure 4 show representative applications of the inventive gear (10) on a gear pump. The fluid fluctuation inside the gear pump has been reduced due to the inventive gear (10) with a curvilinear involute profile. In this way, the gear pump operates more silently. In addition, thanks to the curvilinear involute profile, the cavitation phenomenon inside the gear pump has been minimized.

[0034] For this purpose, the curvature profile of the teeth (11) on the gear (10) has been designed at the optimum radius of curvature. The radius of curvature of the said teeth (11 ) is preferably 180 mm.

[0035] The gears (10) operate in such a way that the teeth (11 ) correspond to each other, i.e. are asymmetrical (Figure 4). By increasing the volume of the gaps between the teeth (11) during the gear operation (10), the volumetric flow rate of the gear pump has been increased. In addition, thanks to its different geometric design, it operates with less noise (approximately 10%). The half- tooth (11 ) profile on the gear (10) occupies less space, and for the fluid to be transmitted to the outlet port in the gear pump, the number of teeth (11 ) has been increased to carry more fluid between the gaps of the gear (11 ). The number of teeth (11 ) on the gear (10) has been manufactured to be preferably 18 teeth (11 ).

Claims

CLAIMS1. A gear (10) with teeth (11 ) formed on it, used in external gear pumps, reducing flow fluctuation and thus noise level, reducing cavitation phenomenon and also providing efficient operation, and its feature is;• It has an involute profile structure, is formed asymmetrically in half, and• It contains teeth (11) formed in a curved manner with a radius of curvature from one side of the gear (11 ) to the other.

2. A gear (10) by claim 1 , and its feature is: The radius of curvature of the teeth (11 ) formed on the gear (10) is 180 mm.

3. A gear (10) by claim 1 , and its feature is that it contains 18 teeth (11 ) formed on the gear(10).

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