An oil supply pump

Abstract

The utility model provides an oil supply pump belongs to gear pump technical field. It solved the existing oil supply pump easy backflow etc. technical problem. An oil supply pump, including fixed connection's pump cover, the cylindrical portion on the guide pulley seat, the pump cover and the cylindrical portion between the sleeve setting drive gear and passive gear, the outer tooth of drive gear and the inner tooth of passive gear mesh, the pump cover has the oil outlet chamber, the first oil outlet hole and the second oil outlet hole of interpenetration are provided on the guide pulley seat, the first oil outlet hole other end and the oil outlet chamber intercommunication, the side of guide pulley seat has the mounting hole, the other end of second oil outlet hole straight intercommunication to the mounting hole, the mounting hole is provided with the steel ball, the pump cover is provided with the buffer hole, and the buffer hole is connected with the junction of mounting hole and second oil outlet hole intercommunication, and the steel ball drops to block second oil outlet hole or rises to make second oil outlet hole and buffer hole intercommunication. The utility model solved the backflow problem, ensured the unidirectionality and stability of oil supply, improved the work efficiency of pump.

Description

Technical Field

[0001] This utility model belongs to the field of pump technology, and specifically refers to an oil supply pump. Background Technology

[0002] An oil pump typically consists of key components such as a pump housing, bushings, driven gear, driving gear, guide wheel seat, and oil seal. Its working principle is based on the driving gear driving the driven gear to rotate. A certain eccentricity exists between the two, causing the driven gear to rotate in the same direction but asynchronously under the drive gear's influence. During gear meshing, the volume between the teeth changes periodically: when the gears disengage, the volume gradually increases, creating a partial vacuum, thus achieving oil suction; when the gears engage, the volume gradually decreases, compressing the oil and completing the oil compression process. Oil is drawn in through the inlet, compressed within the sealed space formed by the driving and driven gears, and then discharged through the outlet, achieving a continuous and stable oil supply.

[0003] For example, in a forklift oil pump with patent number 2014205637897, the oil inlet is located on the guide wheel seat for connecting to an external oil source; the oil outlet is also located on the guide wheel seat and connected to the high-pressure oil circuit of the system; the return oil hole is used to return a portion of the oil to the oil tank to maintain stable system pressure. However, the path of the oil outlet in this structure is relatively short and directly connected to the sealed chamber formed by gear meshing, which makes the high-pressure oil in the system prone to backflow, potentially affecting the oil supply efficiency and causing pressure fluctuations. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an oil supply pump that can prevent high-pressure oil backflow.

[0005] The objective of this utility model can be achieved through the following technical solution: An oil pump includes a pump cover and a guide wheel seat fixedly connected. The guide wheel seat includes a cylindrical part and a flange located at the bottom end of the cylindrical part. The cylindrical part passes through the pump cover. A driving gear and a driven gear are sleeved between the pump cover and the cylindrical part of the guide wheel seat. The external teeth of the driving gear and the internal teeth of the driven gear mesh. The driving gear and the driven gear are eccentrically arranged. The pump cover has an oil outlet chamber. The guide wheel seat is provided with a first oil outlet hole and a second oil outlet hole that are perpendicularly connected to each other. The other end of the first oil outlet hole is connected to the oil outlet chamber. The side of the guide wheel seat has a mounting hole. The other end of the second oil outlet hole is directly connected to the mounting hole. A steel ball is provided in the mounting hole. The pump cover is provided with a buffer hole. The buffer hole is connected to the junction of the mounting hole and the second oil outlet hole. The steel ball descends to block the second oil outlet hole or rises to connect the second oil outlet hole with the buffer hole.

[0006] In the aforementioned oil pump, the buffer orifice includes an inlet, a buffer section, and an outlet. The diameter of the inlet is smaller than the diameter of the steel ball, and the inlet is connected to the junction of the mounting hole and the second oil outlet.

[0007] In the aforementioned oil pump, the buffer orifice is U-shaped, the outlet is located at the upper end of the inlet, and the outlet and the inlet are connected by the buffer section.

[0008] In the aforementioned oil pump, the diameter of the mounting hole is larger than the diameter of the second oil outlet hole.

[0009] In the aforementioned oil pump, the first oil outlet is a stepped hole, and the diameter of the hole on the side closer to the pump cover is larger than the diameter of the hole on the side farther from the pump cover.

[0010] In the aforementioned oil pump, the pump cover has an inwardly recessed mounting groove on the side near the guide wheel seat. One side of the guide wheel seat is embedded in the mounting groove and fixedly connected to the pump cover by bolts. The cylindrical part is fitted with a drive shaft. The drive gear is fixedly sleeved on one end of the drive shaft. A bushing and an oil seal are provided between the drive shaft and the pump cover.

[0011] Compared with existing technologies, the technical effects of this utility model are as follows: First, by setting a one-way valve structure consisting of a steel ball, a mounting hole, and a buffer hole in the oil outlet path, when the pump pressure is sufficient, the high-pressure oil pushes the steel ball upward, opening the oil passage, and the oil can flow out through the buffer hole. When the pump stops working or the system pressure changes instantaneously, which may cause backflow, the steel ball quickly descends under its own gravity or reverse pressure, blocking the second oil outlet hole, thereby cutting off the backflow path of the high-pressure oil, solving the backflow problem, ensuring the one-way and stability of the oil supply, and improving the pump's working efficiency. Second, the concave buffer hole includes an inlet, a buffer section, and an outlet, playing a damping and buffering role. When the high-pressure oil flows out, it needs to pass through the narrow inlet section, enter the larger-volume buffer section, and finally flow out from the outlet section. This process can effectively smooth the inherent oil discharge pulsation of the gear pump, absorb hydraulic shock, significantly reduce system pressure fluctuations and operating noise, and make the oil pump work more smoothly. Third, the first oil outlet adopts a stepped hole design and has a large diameter near the pump cover, which facilitates the smoother flow of oil from the oil outlet chamber into the guide wheel seat and reduces flow resistance; the mounting hole has a larger diameter than the second oil outlet, ensuring that the steel ball has enough room to move and can reliably sit on the opening of the second oil outlet for sealing, without getting stuck. Attached Figure Description

[0012] Figure 1 This is a cross-section of the utility model. Figure 1 .

[0013] Figure 2 This is a cross-section of the utility model. Figure 2 .

[0014] Drawing number markings: 1. Pump cover; 101. Mounting groove; 102. Inlet; 103. Buffer section; 104. Outlet section; 105. Oil outlet chamber; 2. Bushing; 3. Driven gear; 4. Driven gear; 5. Guide wheel seat; 501. Flange; 502. Cylindrical section; 503. First oil outlet hole; 504. Second oil outlet hole; 505. Mounting hole; 6. Steel ball; 7. Oil seal; 8. Bolt; 9. Drive shaft. Detailed Implementation

[0015] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0016] It should be noted that the descriptions of "up", "down", "left", "right", "top", "bottom", etc. in this utility model are defined based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0017] according to Figure 1 and Figure 2 As shown: An oil pump includes a pump cover 1, a bushing 2, a driven gear 3, a driving gear 4, a guide wheel seat 5, and an oil seal 7. The guide wheel seat 5 includes a cylindrical portion 502 and a flange 501 located at the bottom end of the cylindrical portion 502. The cylindrical portion 502 passes through the pump cover 1. The driving gear 4 and the driven gear 3 are fitted between the pump cover 1 and the cylindrical portion 502 of the guide wheel seat 5. The external teeth of the driving gear 4 and the internal teeth of the driven gear 3 mesh. The driving gear 4 and the driven gear 3 are eccentrically arranged. The side of the pump cover 1 near the guide wheel seat 5 has an inwardly recessed mounting groove 101. One side of the guide wheel seat 5 is embedded in the mounting groove 101 and is fixedly connected to the pump cover 1 by bolts 8. A drive shaft 9 is fitted over the cylindrical portion 502. The driving gear 4 is fixedly fitted onto one end of the drive shaft 9. The bushing 2 and the oil seal 7 are provided between the drive shaft 9 and the pump cover 1. The driving gear 4 is driven to rotate by the drive shaft 9. Due to a certain eccentricity between the driving gear 4 and the driven gear 3, the driven gear 3 rotates in the same direction but asynchronously. During the meshing process, the inter-tooth volume of the driving gear 4 and the driven gear 3 changes periodically. In the disengagement area, the volume gradually increases, forming a partial vacuum, thus completing oil suction; in the engagement area, the volume gradually decreases, and the oil is squeezed, thus completing oil compression. The oil is drawn in from the inlet, compressed in the sealed space of the driving gear 4 and the driven gear 3, and then discharged from the outlet path, achieving continuous oil supply.

[0018] The pump cover 1 has an oil outlet chamber 105. The guide wheel seat 5 has a first oil outlet hole 503 and a second oil outlet hole 504 that are perpendicularly connected to each other. The other end of the first oil outlet hole 503 communicates with the oil outlet chamber 105. The guide wheel seat 5 has a mounting hole 505 on its side. The other end of the second oil outlet hole 504 is directly connected to the mounting hole 505. A steel ball 6 is placed inside the mounting hole 505. The pump cover 1 has a buffer hole that communicates with the junction of the mounting hole 505 and the second oil outlet hole 504. The steel ball 6 descends to block the second oil outlet hole 504 or rises to connect the second oil outlet hole 504 with the buffer hole. The buffer hole includes an inlet 102, a buffer section 103, and an outlet 104. The diameter of the inlet 102 is smaller than the diameter of the steel ball 6. The inlet 102 communicates with the junction of the mounting hole 505 and the second oil outlet hole 504. The buffer hole is U-shaped, with the outlet 104 located at the upper end of the inlet 102, and the buffer section 103 connecting the outlet 104 and the inlet 102. The diameter of the mounting hole 505 is larger than the diameter of the second oil outlet hole 504. The first oil outlet hole 503 is a stepped hole, and the diameter of the hole on the side closer to the pump cover 1 is larger than the diameter of the hole on the side farther from the pump cover 1.

[0019] By incorporating a one-way valve structure consisting of a steel ball 6, a mounting hole 505, and a buffer hole in the oil outlet path, when the pump pressure is sufficient, the high-pressure oil pushes the steel ball 6 upward, opening the oil passage, allowing the oil to flow out through the buffer hole. When the pump stops working or a sudden change in system pressure may cause backflow, the steel ball 6 rapidly descends under its own weight or reverse pressure, blocking the second oil outlet hole 504, thereby cutting off the backflow path of the high-pressure oil, solving the backflow problem, ensuring the one-way and stable supply of oil, and improving the pump's working efficiency. The U-shaped buffer hole includes an inlet 102, a buffer section 103, and an outlet 104, serving as a damping and buffering mechanism. When the high-pressure oil flows out, it needs to pass through the narrow inlet 102, enter the larger-volume buffer section 103, and finally flow out from the outlet 104. This process effectively smooths the inherent oil discharge pulsation of the gear pump, absorbs hydraulic shock, significantly reduces system pressure fluctuations and operating noise, and makes the oil pump work more smoothly. The first oil outlet 503 adopts a stepped hole design and has a larger diameter on the side near the pump cover 1, which facilitates the smoother flow of oil from the oil outlet chamber 105 into the oil outlet path of the guide wheel seat 5 and reduces flow resistance. The mounting hole 505 has a larger diameter than the second oil outlet 504, ensuring that the steel ball 6 has enough room to move and can reliably sit on the opening of the second oil outlet 504 for sealing without getting stuck.

[0020] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection defined by the claims of the present utility model.

Claims

1. An oil supply pump comprising a fixedly connected pump cover (1) and a guide wheel base (5), said guide wheel base (5) comprising a cylindrical portion (502) and a flange (501) at the bottom end of the cylindrical portion (502), said cylindrical portion (502) passing through the pump cover (1), a driving gear wheel (4) and a driven gear wheel (3) being arranged between the pump cover (1) and the cylindrical portion (502) of the guide wheel base (5), the outer teeth of the driving gear wheel (4) and the inner teeth of the driven gear wheel (3) being engaged, the driving gear wheel (4) and the driven gear wheel (3) being arranged eccentrically, characterized in that The pump cover (1) has an oil outlet chamber (105). The guide wheel seat (5) is provided with a first oil outlet hole (503) and a second oil outlet hole (504) that are perpendicularly connected to each other. The other end of the first oil outlet hole (503) is connected to the oil outlet chamber (105). The side of the guide wheel seat (5) has an installation hole (505). The other end of the second oil outlet hole (504) is directly connected to the installation hole (505). A steel ball (6) is provided in the installation hole (505). The pump cover (1) is provided with a buffer hole. The buffer hole is connected to the junction of the installation hole (505) and the second oil outlet hole (504). The steel ball (6) descends to block the second oil outlet hole (504) or rises to connect the second oil outlet hole (504) with the buffer hole.

2. An oil feed pump according to claim 1, wherein: The buffer hole includes an inlet (102), a buffer (103), and an outlet (104). The diameter of the inlet (102) is smaller than the diameter of the steel ball (6). The inlet (102) is connected to the junction of the mounting hole (505) and the second oil outlet (504).

3. An oil feed pump according to claim 2, wherein: The buffer hole is U-shaped, the outlet (104) is located at the upper end of the inlet (102), and the outlet (104) and the inlet (102) are connected by the buffer (103).

4. The oil feed pump according to claim 1, characterized in that: The diameter of the mounting hole (505) is larger than the diameter of the second oil outlet hole (504).

5. The oil feed pump according to claim 1, characterized in that: The first oil outlet (503) is a stepped hole, and the diameter of the hole on the side closer to the pump cover (1) is larger than the diameter of the hole on the side farther away from the pump cover (1).

6. The oil feed pump according to any one of claims 1 to 5, characterized in that: The pump cover (1) has an inwardly recessed mounting groove (101) on the side near the guide wheel seat (5). One side of the guide wheel seat (5) is embedded in the mounting groove (101) and fixedly connected to the pump cover (1) by bolts (8). The cylindrical part (502) is fitted with a drive shaft (9). The drive gear (4) is fixedly fitted on one end of the drive shaft (9). A bushing (2) and an oil seal (7) are provided between the drive shaft (9) and the pump cover (1).

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