Seven-star double-speed hydraulic motor

Abstract

The utility model provides a seven-star double-speed hydraulic motor, which relates to the technical field of hydraulic motors and comprises a motor main body, a liquid inlet part fixed on the side surface of the motor main body, a limiting part fixed on the side surface of the liquid inlet part, a fillet ring edge arranged on the edge of the limiting part and a rotating groove arranged on the inner wall of the limiting part, the problem that in the using process of the seven-star double-speed hydraulic motor, hydraulic driving is usually conducted through a fixed oil inlet pipe, the direction of the oil inlet pipe is difficult to adjust in the installing process due to the fixity of the oil pipe so that the seven-star double-speed hydraulic motor can adapt to different installing environments and layout of a hydraulic system is solved by installing the fixing block. In occasions with limited space or complex design of a hydraulic system, an operator needs to spend more time and energy to ensure the correct position and connection of an oil pipe, and in many application scenes, a hydraulic motor for fixing the oil pipe needs to stably work in a variable environment, so that the hydraulic motor is inconvenient to operate. The fixity of the oil pipe reduces the adaptability of the motor to different working environments, so that the motor is difficult to meet special requirements, such as a narrow space.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic motors, in particular to a seven-star dual-speed hydraulic motor. Background Art

[0002] The Qixing two-speed hydraulic motor is a hydraulic actuator with two different speed settings, which can switch between high and low speeds to adapt to different working conditions. The Qixing two-speed hydraulic motor is mainly composed of a motor body and a regulating valve. This motor is widely used in many fields such as heavy lifting and lowering, ship driving, construction machinery, mining equipment, etc. Its unique two-speed design can achieve fast and safe lowering of heavy objects without increasing cost and volume, effectively improving operational efficiency and safety. At the same time, due to its excellent sealing and easy maintenance, the Qixing two-speed hydraulic motor is widely welcomed in actual use.

[0003] In the prior art, during the use of the seven-star two-speed hydraulic motor, hydraulic drive is usually required through a fixed oil inlet pipe. When faced with complex and changeable industrial environments and demands, the fixed nature of the oil pipe makes it difficult to adjust its direction during installation to adapt to different installation environments and the layout of the hydraulic system. This lack of flexibility in the design significantly increases the difficulty and time of installation, especially in situations where space is limited or the hydraulic system design is complex. The operator needs to spend more time and energy to ensure the correct position and connection of the oil pipe, which increases the initial workload of the project. In many application scenarios of hydraulic motors with fixed oil pipes, such as navigation, mining or construction machinery, the equipment needs to be able to work stably in a changing environment. The fixed nature of the oil pipe reduces the adaptability of the motor to different working environments, making it difficult to meet special needs, such as operation in a small space or rapid response to different flows and pressures. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a seven-star dual-speed hydraulic motor.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a seven-star two-speed hydraulic motor, comprising a motor body, a liquid inlet part is fixed on the side of the motor body, a limiting part is fixed on the side of the liquid inlet part, the edge of the limiting part is set as a rounded ring edge, a rotation groove is provided on the inner wall of the limiting part, an inner oil pipe is slidably connected to the inner wall of the limiting part, an oil inlet pipe is fixed to one end of the inner oil pipe, a sliding groove is provided on the circumferential surface of the oil inlet pipe, a mounting groove is provided on one side of the inner wall of the sliding groove, an electromagnet is fixed on one side of the inner wall of the mounting groove, a fixed disc is provided on the inner wall of the mounting groove, a connecting column is fixed on one side of the fixed disc, and a return spring is fixed on the circumferential surface of the connecting column A fixing block is fixed at one end of the connecting column, and the side surface of the fixing block is slidably connected to the inner wall of the sliding groove. The edge of one side of the fixing block is set as a rounded cut edge, and the side surface of the fixing block is slidably connected to the inner wall of the rotating groove. In the prior art, during the use of the seven-star two-speed hydraulic motor, it is usually necessary to use a fixed oil inlet pipe for hydraulic drive. In the face of complex and changeable industrial environments and needs, the fixedness of the oil pipe makes it difficult to adjust its direction during the installation process to adapt to different installation environments and layouts of the hydraulic system. This lack of flexibility in the design significantly increases the difficulty and time of installation, especially in situations where space is limited or the hydraulic system design is complex, and the operator needs to It takes more time and effort to ensure the correct position and connection of the oil pipe, which increases the initial workload of the project. In many application scenarios of hydraulic motors with fixed oil pipes, such as navigation, mining or construction machinery, the equipment needs to be able to work stably in a changing environment. The fixedness of the oil pipe reduces the adaptability of the motor to different working environments, making it difficult to meet special needs, such as operation in a small space or rapid response to different flow rates and pressures. To solve such problems, the utility model adopts the method of installing a fixed block to solve it, so that when the staff needs to install the oil inlet pipe, the inner oil pipe is first placed in the liquid inlet part, and when the oil inlet pipe contacts the rounded edge of the limiting part, the inner oil pipe is placed in the liquid inlet part. When the oil inlet pipe is disassembled, the electromagnet can be controlled to start, and the electromagnet attracts the fixed disc, so that the fixed block re-enters the inner wall of the sliding groove, thereby disassembling the components, thereby improving the user experience and increasing the application range of the equipment.

[0006] Preferably, a rubber ring is fixed to the inner wall of the limiting member. In the prior art, in a hydraulic system, the fit between the oil inlet pipe and the limiting member is crucial. These components are usually designed with strict tolerances to ensure effective sealing and accurate transmission of the fluid. When the oil inlet pipe is designed to be rotatable, this dynamic interface often produces uneven stress between the components. The uneven stress can produce tiny gaps or deformations on the joint surface, which is particularly prone to problems in high-pressure environments. Over time, these tiny inconsistencies will gradually worsen, eventually leading to an incomplete seal. Once the seal is no longer reliable, leakage occurs, that is, hydraulic oil or other working fluids leak out from the joint. Leakage not only reduces the working efficiency of the system, but also causes environmental pollution and even leads to more serious problems. Mechanical failure and safety risks. To solve such problems, the utility model adopts the method of installing rubber rings. Before the staff installs the oil inlet pipe, they need to fix the rubber ring on the inner wall of the limiting piece. As a sealing material, the rubber ring is designed to fill the tiny gaps between metal parts and provide an elastic interface to accommodate slight movements and vibrations while preventing liquid leakage. When the oil inlet pipe is installed into the limiting piece, the rubber ring will be compressed between the two. This compression action puts pressure on the rubber ring, causing it to deform and fill all uneven surfaces, thereby forming a continuous sealing layer. This sealing layer can prevent liquid from passing through, ensuring that the pressure of the hydraulic system is maintained, while preventing any potential leakage, thereby achieving the effect of improving the safety of equipment use.

[0007] Preferably, a fixing pin is fixed on the side of the limiting member. In the prior art, during the operation of the hydraulic system, the movement of the equipment is usually accompanied by inevitable vibration. The oil in the oil inlet pipe has a certain mass. Its inertial effect in a vibrating environment will generate additional stress on the limiting member. This periodic force caused by the vibration will cause the limiting member to gradually loosen. Once the limiting member begins to loosen, it will lose its original fixing ability, further weakening the structural integrity of the entire assembly. If the problem is not detected and repaired in time, the continuous vibration and the gravity of the oil will eventually cause the limiting member to fall off. The loosening or even falling off of the limiting member will not only cause leakage of the hydraulic system, but also cause more serious mechanical failures, such as damage to parts or leakage of hydraulic oil to pollute the environment, and even cause safety accidents such as fire. In addition, the sudden failure of the system also leads to production stagnation, resulting in expensive maintenance costs and production losses. In response to such problems, the utility model solves the problem by installing fixing pins, thereby improving the fixing effect of the limiting member by installing additional fixing pins on it, thereby achieving the effect of increasing the service life of the equipment.

[0008] Preferably, an expansion groove is provided on the side of the limiting member to reduce the influence of thermal expansion and contraction on the equipment and increase the service life of the equipment.

[0009] Preferably, the length of the inner wall of the installation groove is greater than the length of the fixing block, so as to prevent scratches between the fixing block and the component and increase the service life of the equipment.

[0010] Preferably, the thickness of the rubber ring is greater than 3 mm to improve the protective effect.

[0011] Preferably, the diameter of the inner oil pipe is smaller than the diameter of the oil inlet pipe, thereby increasing the applicable scope of the equipment.

[0012] Beneficial effects:

[0013] 1. In the prior art, during the use of the seven-star two-speed hydraulic motor, it is usually necessary to use a fixed oil inlet pipe for hydraulic drive. In the face of complex and changeable industrial environments and demands, the fixedness of the oil pipe makes it difficult to adjust its direction during installation to adapt to different installation environments and the layout of the hydraulic system. This lack of flexibility in the design significantly increases the difficulty and time of installation, especially in situations where space is limited or the hydraulic system design is complex. The operator needs to spend more time and energy to ensure the correct position and connection of the oil pipe, which increases the initial workload of the project. In many application scenarios of hydraulic motors with fixed oil pipes, such as navigation, mining or construction machinery, the equipment needs to be able to work stably in a changing environment. The fixedness of the oil pipe reduces the adaptability of the motor to different working environments, making it difficult to meet special needs, such as operation in a small space or operation with different flow rates and The utility model solves the problem of rapid response of pressure by installing a fixing block. When the staff needs to install the oil inlet pipe, the inner oil pipe is first placed in the liquid inlet part. When the oil inlet pipe contacts the rounded ring edge of the limiting part, the rounded cut edge of the oil inlet pipe fixing block contacts the rounded ring edge. At the same time, the fixing block is inserted into the sliding groove, and the return spring is compressed to accumulate elastic potential energy. When the fixing block passes through the rotating groove, the return spring releases the elastic potential energy and pops out the fixing block, so that the fixing block enters the rotating groove. The staff can rely on this structure to fix the oil inlet pipe and the inner oil pipe and can rotate the oil inlet pipe and the inner oil pipe at the same time, so that the direction of the oil inlet pipe changes, which is convenient for the oil inlet pipe to enter oil in different directions. When the staff needs to remove the oil inlet pipe, the electromagnet can be controlled to start, and the electromagnet attracts the fixed disc to make the fixing block re-enter the inner wall of the sliding groove, thereby removing the component, thereby improving the user experience and increasing the scope of application of the equipment.

[0014] 2. In the prior art, in hydraulic systems, the fit between the oil inlet pipe and the restrictor is critical. These components are usually designed with strict tolerances to ensure effective sealing and accurate fluid transmission. When the oil inlet pipe is designed to be rotatable, this dynamic interface often produces uneven stress between components. Uneven stress can produce tiny gaps or deformations on the joint surface, which is particularly prone to problems in high-pressure environments. Over time, these tiny inconsistencies will gradually worsen, eventually leading to incomplete sealing. Once the seal is no longer reliable, leakage occurs, that is, hydraulic oil or other working fluids leak out from the joint. Leakage not only reduces the system's operating efficiency, but also causes environmental pollution and even leads to more serious mechanical failures and safety issues. Risk. To solve this type of problem, the utility model adopts the method of installing a rubber ring to achieve that before the staff installs the oil inlet pipe, they need to fix the rubber ring on the inner wall of the restricting piece. As a sealing material, the rubber ring is designed to fill the tiny gaps between metal parts and provide an elastic interface to accommodate slight movements and vibrations while preventing liquid leakage. When the oil inlet pipe is installed into the restricting piece, the rubber ring will be compressed between the two. This compression action puts pressure on the rubber ring, causing it to deform and fill all uneven surfaces, thereby forming a continuous sealing layer. This sealing layer can prevent liquid from passing through, ensuring that the pressure of the hydraulic system is maintained, while preventing any potential leakage, thereby achieving the effect of improving the safety of equipment use.

[0015] 3. In the prior art, during the operation of the hydraulic system, the movement of the equipment is usually accompanied by inevitable vibration. The oil in the oil inlet pipe has a certain mass. Its inertial effect in a vibrating environment will generate additional stress on the limiting part. This periodic force caused by the vibration will cause the limiting part to gradually loosen. Once the limiting part begins to loosen, it will lose its original fixing ability, further weakening the structural integrity of the entire assembly. If the problem is not detected and repaired in time, the continuous vibration and the gravity of the oil will eventually cause the limiting part to fall off. The loosening or even falling off of the limiting part will not only cause leakage of the hydraulic system, but also cause more serious mechanical failures, such as damage to parts or leakage of hydraulic oil to pollute the environment, and even cause safety accidents such as fire. In addition, the sudden failure of the system also leads to production stagnation, resulting in expensive maintenance costs and production losses. In response to such problems, the utility model solves the problem by installing fixing pins, thereby improving the fixing effect of the limiting part by installing additional fixing pins to improve the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0017] Figure 2It is a three-dimensional structural schematic diagram of the fixing pin of the utility model;

[0018] Figure 3 It is a three-dimensional structural schematic diagram of the oil inlet pipe of the utility model;

[0019] Figure 4 It is a cross-sectional view of the sliding groove of the utility model;

[0020] Figure 5 It is a three-dimensional structural schematic diagram of the liquid inlet part of the utility model.

[0021] Legend:

[0022] 1. Motor body; 101. Liquid inlet part; 102. Limiting part; 103. Rounded corner edge; 104. Rotating groove; 105. Inner oil pipe; 106. Oil inlet pipe; 2. Sliding groove; 201. Mounting groove; 202. Electromagnet; 203. Fixed disk; 204. Connecting column; 205. Return spring; 206. Fixed block; 207. Rounded corner edge; 3. Rubber ring; 301. Expansion groove; 4. Fixed pin. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments and drawings, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0024] The specific embodiments of the present utility model are described below in conjunction with the accompanying drawings. Specific embodiment:

[0026] Reference Figure 1-5A seven-star two-speed hydraulic motor comprises a motor body 1, a liquid inlet 101 is fixed on the side of the motor body 1, a limiting member 102 is fixed on the side of the liquid inlet 101, the edge of the limiting member 102 is set as a rounded ring edge 103, a rotation groove 104 is opened on the inner wall of the limiting member 102, an inner oil pipe 105 is slidably connected to the inner wall of the limiting member 102, an oil inlet pipe 106 is fixed at one end of the inner oil pipe 105, a sliding groove 2 is opened on the circumference of the oil inlet pipe 106, a mounting groove 201 is opened on one side of the inner wall of the sliding groove 2, an electromagnet 202 is fixed on one side of the inner wall of the mounting groove 201, a fixed disc 203 is provided on the inner wall of the mounting groove 201, a connecting column 204 is fixed on one side of the fixed disc 203, a reset spring 205 is fixed on the circumference of the connecting column 204, and a reset spring 205 is fixed on one end of the connecting column 204. A fixed block 206 is fixed, and the side of the fixed block 206 is slidably connected to the inner wall of the sliding groove 2. The edge of one side of the fixed block 206 is set as a rounded cut edge 207. The side of the fixed block 206 is slidably connected to the inner wall of the rotating groove 104. During the use of the seven-star two-speed hydraulic motor, it is usually necessary to use a fixed oil inlet pipe 106 for hydraulic drive. In the face of complex and changeable industrial environments and needs, the fixedness of the oil pipe makes it difficult to adjust its direction during installation to adapt to different installation environments and layouts of the hydraulic system. This lack of flexibility in the design significantly increases the difficulty and time of installation, especially in situations where space is limited or the hydraulic system design is complex. The operator needs to spend more time and energy to ensure the correct position and connection of the oil pipe. This increases the initial workload of the project. In many application scenarios of hydraulic motors with fixed oil pipes, such as navigation, mining or construction machinery, the equipment needs to be able to work stably in a changing environment. The fixity of the oil pipe reduces the adaptability of the motor to different working environments, making it difficult to meet special needs, such as operation in a small space or rapid response to different flow rates and pressures. This problem is solved by installing a fixed block 206. When the staff needs to install the oil inlet pipe 106, the inner oil pipe 105 is first placed in the liquid inlet part 101. When the oil inlet pipe 106 contacts the rounded ring edge 103 of the limiting part 102, the rounded cut edge 207 of the oil inlet pipe 106 fixing block 206 contacts the rounded ring edge 103, and the fixing block 206 is plugged. When the fixing block 206 passes through the rotating groove 104, the returning spring 205 releases the elastic potential energy to pop out the fixing block 206, so that the fixing block 206 enters the rotating groove 104. The staff can rely on this structure to fix the oil inlet pipe 106 and the inner oil pipe 105, and can rotate the oil inlet pipe 106 and the inner oil pipe 105 at the same time, so that the direction of the oil inlet pipe 106 changes, which is convenient for the oil inlet pipe 106 to enter oil in different directions. When the staff needs to remove the oil inlet pipe 106, the electromagnet 202 can be controlled to start, and the gravitational force of the electromagnet 202 attracts the fixed disc 203, so that the fixing block 206 re-enters the inner wall of the sliding groove 2, thereby disassembling the components, thereby improving the user experience and increasing the scope of application of the equipment.The inner wall length of the mounting groove 201 is greater than the length of the fixing block 206, which prevents the fixing block 206 from scratching the components and improves the service life of the equipment. The diameter of the inner oil pipe 105 is smaller than the diameter of the oil inlet pipe 106, which improves the application range of the equipment.

[0027] A rubber ring 3 is fixed to the inner wall of the limiting member 102. In the hydraulic system, the cooperation between the oil inlet pipe 106 and the limiting member 102 is crucial. These components are usually designed with strict tolerances to ensure effective sealing and accurate transmission of fluids. When the oil inlet pipe 106 is designed to be rotatable, this dynamic interface often produces uneven stress between the components. The uneven stress can produce tiny gaps or deformations on the joint surface, which is particularly prone to problems in high-pressure environments. Over time, these tiny inconsistencies will gradually worsen, eventually leading to incomplete sealing. Once the seal is no longer reliable, leakage will occur, that is, hydraulic oil or other working fluids will leak out from the joint. Leakage not only reduces the working efficiency of the system, but also causes environmental pollution and even leads to more serious machine failures. Mechanical failure and safety risks are solved by installing a rubber ring 3. Before installing the oil inlet pipe 106, the staff needs to fix the rubber ring 3 on the inner wall of the limiting piece 102. As a sealing material, the rubber ring 3 is designed to fill the tiny gaps between metal parts and provide an elastic interface to accommodate slight movements and vibrations while preventing liquid leakage. When the oil inlet pipe 106 is installed in the limiting piece 102, the rubber ring 3 will be compressed between the two. This compression action exerts pressure on the rubber ring 3, causing it to deform and fill all uneven surfaces, thereby forming a continuous sealing layer. This sealing layer can prevent liquid from passing through, ensuring that the pressure of the hydraulic system is maintained, while preventing any potential leakage, thereby achieving the effect of improving the safety of equipment use. A fixing pin 4 is fixed on the side of the limiting member 102. During the operation of the hydraulic system, the movement of the equipment is usually accompanied by inevitable vibration. The oil in the oil inlet pipe 106 has a certain mass. Its inertial effect in a vibrating environment will generate additional stress on the limiting member 102. This periodic force caused by the vibration will cause the limiting member 102 to gradually loosen. Once the limiting member 102 begins to loosen, it will lose its original fixing ability, further weakening the structural integrity of the entire assembly. If the problem is not detected and repaired in time, the continuous vibration and the gravity of the oil will eventually cause the limiting member 102 to fall off. The loosening or even falling off of the limiting member 102 will not only cause leakage of the hydraulic system, but also cause more serious mechanical failures, such as damage to parts or leakage of hydraulic oil to pollute the environment, and even cause safety accidents such as fire. In addition, the sudden failure of the system also leads to production stagnation, resulting in expensive maintenance costs and production losses. The problem is solved by installing a fixing pin 4, which improves the fixing effect of the limiting member 102 by installing an additional fixing pin 4 to improve the service life of the equipment. An expansion groove 301 is provided on the side of the limiting member 102 to reduce the influence of thermal expansion and contraction on the device and increase the service life of the device. The thickness of the rubber ring 3 is greater than 3 mm to improve the protection effect.

[0028] The working principle of the utility model is as follows: when the staff needs to install the oil inlet pipe 106, first put the inner oil pipe 105 into the liquid inlet part 101, when the oil inlet pipe 106 contacts the rounded corner edge 103 of the limiting part 102, the rounded corner cut edge 207 of the fixing block 206 of the oil inlet pipe 106 contacts the rounded corner edge 103, and at the same time the fixing block 206 is inserted into the sliding groove 2, the return spring 205 is compressed to accumulate elastic potential energy, and when the fixing block 206 passes through the rotating groove 104, the return spring 205 releases the elastic potential energy and pops out the fixing block 206. The fixed block 206 allows the fixed block 206 to enter the rotating groove 104. The staff can rely on this structure to fix the oil inlet pipe 106 and the inner oil pipe 105 and can rotate the oil inlet pipe 106 and the inner oil pipe 105 at the same time, so that the direction of the oil inlet pipe 106 changes, which is convenient for the oil inlet pipe 106 to enter oil in different directions. When the staff needs to remove the oil inlet pipe 106, the electromagnet 202 can be controlled to start. The gravitational force of the electromagnet 202 attracts the fixed disc 203, so that the fixed block 206 re-enters the inner wall of the sliding groove 2, thereby removing the component.

[0029] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A seven-star two-speed hydraulic motor, comprising a motor body (1), characterized in that: A liquid inlet part (101) is fixed on the side of the motor body (1), a limiting part (102) is fixed on the side of the liquid inlet part (101), the edge of the limiting part (102) is set as a rounded ring edge (103), a rotation groove (104) is opened on the inner wall of the limiting part (102), an inner oil pipe (105) is slidably connected to the inner wall of the limiting part (102), an oil inlet pipe (106) is fixed at one end of the inner oil pipe (105), a sliding groove (2) is opened on the circumference of the oil inlet pipe (106), and a mounting groove (201) is opened on one side of the inner wall of the sliding groove (2). An electromagnet (202) is fixed on one side of the inner wall of the groove (201); a fixed circular disc (203) is provided on the inner wall of the mounting groove (201); a connecting column (204) is fixed on one side of the fixed circular disc (203); a return spring (205) is fixed on the circumference of the connecting column (204); a fixing block (206) is fixed on one end of the connecting column (204); a side surface of the fixing block (206) is slidably connected to the inner wall of the sliding groove (2); an edge of one side of the fixing block (206) is set as a rounded cut edge (207); and a side surface of the fixing block (206) is slidably connected to the inner wall of the rotating groove (104).

2. A seven-star dual-speed hydraulic motor according to claim 1, characterized in that: A rubber ring (3) is fixed to the inner wall of the limiting member (102).

3. A seven-star dual-speed hydraulic motor according to claim 1, characterized in that: A fixing pin (4) is fixed on the side of the limiting member (102).

4. The seven-star dual-speed hydraulic motor according to claim 1 is characterized in that: An expansion groove (301) is formed on the side of the limiting member (102).

5. The seven-star dual-speed hydraulic motor according to claim 1 is characterized in that: The inner wall length of the installation groove (201) is greater than the length of the fixing block (206).

6. A seven-star dual-speed hydraulic motor according to claim 2, characterized in that: The thickness of the rubber ring (3) is greater than 3 mm.

7. The seven-star dual-speed hydraulic motor according to claim 1, characterized in that: The diameter of the inner oil pipe (105) is smaller than the diameter of the oil inlet pipe (106).

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