A double pump composed of an oil pump and a vacuum pump

Abstract

The present invention relates to a duplex pump composed of an oil pump and a vacuum pump, comprising a pump body, an oil pump cover, a vacuum pump cover, and a driving shaft. The pump body is provided with an oil pump chamber and a vacuum pump chamber, an oil pump inner rotor and an oil pump outer rotor being installed in the oil pump chamber, and a vacuum pump rotor and blades being installed in the vacuum pump chamber. The oil pump inner rotor is fixedly mounted in the middle of the driving shaft, the outer end of the driving shaft extends through the axial hole of the oil pump cover for mounting a sprocket, and the inner end of the driving shaft extends through the axial hole of the pump body toward the vacuum pump chamber for mounting the vacuum pump rotor. An annular pressure-matching chamber A is provided on the inner side surface of the oil pump cover, and an annular pressure-matching chamber B is provided on the end surface of the oil pump inner rotor facing the pump body. The inner and outer diameters and depths of the pressure-matching chambers A and B are equal. The present invention can simultaneously meet the use requirements of the oil pump and the vacuum pump, eliminate the unbalanced forces generated internally during operation, reduce the eccentric wear between the rotating components and the pump body and the pump cover, and thus extend the service life of the product.

Description

Technical Field

[0001] The present invention relates to an engine lubrication system and a braking system, and in particular to an integration of an oil pump and a vacuum pump. Background Art

[0002] Automobile braking systems typically feature a mechanical vacuum pump to draw vacuum for the vacuum booster, while the engine lubrication system utilizes an oil pump to lubricate and cool the engine. The integration of these two components has tightened performance testing. Traditionally, the vacuum pump and oil pump are integrated, and internal rotating parts, along with the pump body, pump cover, and shaft bore, are prone to uneven wear, shortening product lifespan. This can lead to problems with the engine lubrication and braking systems, causing recurring problems. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a double pump composed of an oil pump and a vacuum pump, which can eliminate the unbalanced force generated internally during operation and reduce the eccentric wear between the rotating parts and the pump body and pump cover while meeting the use requirements of the oil pump and the vacuum pump.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a double pump composed of an oil pump and a vacuum pump, including a pump body, an oil pump cover, a vacuum pump cover, and a driving shaft, the pump body is provided with an oil pump chamber and a vacuum pump chamber, the oil pump inner rotor and the oil pump outer rotor are installed in the oil pump chamber, and the vacuum pump rotor and blades are installed in the vacuum pump chamber; the oil pump inner rotor is fixedly installed in the middle of the driving shaft, the outer end of the driving shaft passes through the axial hole of the oil pump cover for installing the sprocket, the inner end of the driving shaft passes through the axial hole of the pump body and extends to the vacuum pump chamber for installing the vacuum pump rotor, the inner side surface of the oil pump cover is provided with an annular pressure matching A chamber, and the end face of the oil pump inner rotor facing the pump body is provided with an annular pressure matching B chamber, the inner and outer diameters and depths of the pressure matching A chamber and the pressure matching B chamber are equal.

[0005] Preferably, both the pressure matching chamber A and the pressure matching chamber B draw oil from the high-pressure chamber.

[0006] Furthermore, the vacuum pump rotor is connected to the driving shaft with a flat key, and an annular groove is provided around the corresponding shaft hole on the bottom surface of the vacuum pump chamber. A semi-annular lubricating oil groove is provided on the side wall of the annular groove, and the center point of the lubricating oil groove forms a 45° angle with the radial bisector of the vacuum pump chamber.

[0007] Furthermore, an upper exhaust port and a lower exhaust port are provided on the side wall of the vacuum pump chamber at positions corresponding to the exhaust end, and a reverse exhaust port is also provided at a position parallel to the upper exhaust port.

[0008] Preferably, the position of the lubricating oil groove in the vacuum pump chamber is opposite to the positions of the upper and lower exhaust ports.

[0009] The present invention provides a pressure-matching chamber A and a pressure-matching chamber B to maintain balanced pressure on the upper and lower end faces of the inner rotor of the oil pump. This can eliminate the unbalanced forces generated internally during operation while meeting the use requirements of the oil pump and the vacuum pump, reduce eccentric wear between the rotating components and the pump body and pump cover, and thus extend the service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 Schematic diagram of the cross-sectional structure of a double pump in an embodiment of the present invention;

[0011] Figure 2 Schematic diagram of the oil pump cover structure in an embodiment of the present invention;

[0012] Figure 3 Schematic diagram of the installation structure of the inner rotor and driving shaft of the oil pump in an embodiment of the present invention;

[0013] Figure 4 Schematic diagram of the bottom surface structure of the vacuum pump chamber in an embodiment of the present invention;

[0014] Figure 5 Schematic diagram of the three-dimensional structure of the vacuum pump chamber in an embodiment of the present invention;

[0015] Figure 6 Schematic diagram of the vacuum pump rotor structure in an embodiment of the present invention;

[0016] The accompanying drawings are:

[0017] 10——Pump body 11——Oil pump chamber

[0018] 12——Vacuum pump chamber 13——Lubricating oil groove

[0019] 14——Upper exhaust port 15——Lower exhaust port

[0020] 16——Reverse exhaust port 17——Annular groove

[0021] 20——Oil pump cover 21——Pressure distribution cavity A

[0022] 30——Vacuum pump cover 40——Drive shaft

[0023] 50——Inner rotor of oil pump 51——Pressure distribution chamber B

[0024] 60——Vacuum pump rotor. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the invention more clearly understood, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] like Figures 1 to 6 As shown, the preferred embodiment of the present invention is: a double pump composed of an oil pump and a vacuum pump, including a pump body 10, an oil pump cover 20, a vacuum pump cover 30, and a driving shaft 40. The pump body 10 is provided with an oil pump chamber 11 and a vacuum pump chamber 12. The oil pump chamber 11 is provided with an oil pump inner rotor 50 and an oil pump outer rotor, and the vacuum pump chamber 12 is provided with a vacuum pump rotor 60 and blades; the oil pump inner rotor 50 is fixedly mounted in the middle of the driving shaft 40, and the outer side of the driving shaft 40 is fixedly mounted. The end is passed through the axial hole of the oil pump cover 20 for installing the sprocket, and the inner end of the driving shaft 40 passes through the axial hole of the pump body 10 and extends to the vacuum pump chamber 12 for installing the vacuum pump rotor 60. The inner side surface of the oil pump cover 20 is provided with an annular pressure-matching A chamber 21, and the end surface of the oil pump inner rotor 50 facing the pump body 10 is provided with an annular pressure-matching B chamber 51. The inner and outer diameters and depths of the pressure-matching A chamber 21 and the pressure-matching B chamber 51 are equal, and the pressure-matching A chamber 21 and the pressure-matching B chamber 51 both draw oil from the high-pressure chamber.

[0027] like Figure 1 、 4 As shown in Figures 6 and 7, the vacuum pump rotor 50 is connected to the driving shaft 40 with a flat key. An annular groove 17 is provided around the bottom surface of the vacuum pump chamber 12 corresponding to the shaft hole. A semi-annular lubricating oil groove 13 is provided on the side wall of the annular groove 17. The center point of the lubricating oil groove 13 forms a 45° angle with the radial bisector of the vacuum pump chamber 12.

[0028] like Figure 5 As shown, an upper exhaust port 14 and a lower exhaust port 15 are provided on the side wall of the vacuum pump chamber 12 at positions corresponding to the exhaust ends, and a reverse exhaust port 16 is also provided at a position parallel to the upper exhaust port 14; the position of the lubricating oil groove 13 is opposite to the positions of the upper and lower exhaust ports.

[0029] In this embodiment, the pressure on the upper and lower end faces of the inner rotor of the oil pump is balanced by providing a pressure-matching chamber A 21 and a pressure-matching chamber B 51, thereby reducing the eccentric wear between the inner rotor of each oil pump and the pump body and pump cover. A semi-annular lubricating oil groove 13 is provided on the side wall of the annular groove 17 in the vacuum pump chamber 12. The center point of the lubricating oil groove 13 forms a 45° angle with the radial bisector of the vacuum pump chamber 12, thereby avoiding eccentric wear between the small-diameter end of the vacuum pump rotor 60 and the annular groove 17. Upper and lower exhaust ports are provided on the side wall of the vacuum pump chamber 12, thereby avoiding the large-diameter end of the vacuum pump rotor 60 from being impacted by high-pressure oil and gas at the exhaust end, thereby extending the service life of the entire product.

[0030] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the scope of the patent of the present invention.

[0031] In order to make it easier for those skilled in the art to understand the improvements of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and for the sake of clarity, some other elements have been omitted in this application document. Those skilled in the art should realize that these omitted elements may also constitute the content of the present invention.

Claims

1. A double pump composed of an oil pump and a vacuum pump, comprising a pump body (10), an oil pump cover (20), a vacuum pump cover (30), and a driving shaft (40); an oil pump chamber (11) and a vacuum pump chamber (12) are provided on the pump body (10); an oil pump inner rotor (50) and an oil pump outer rotor are installed in the oil pump chamber (11); a vacuum pump rotor (60) and blades are installed in the vacuum pump chamber (12); and the characteristics are: The inner rotor (50) of the oil pump is fixedly mounted on the middle of the driving shaft (40). The outer end of the driving shaft (40) passes through the axial hole of the oil pump cover (20) for mounting a sprocket. The inner end of the driving shaft (40) passes through the axial hole of the pump body (10) and extends toward the vacuum pump chamber (12) for mounting a vacuum pump rotor (60). The inner side surface of the oil pump cover (20) is provided with an annular pressure-matching cavity A (21). The end surface of the inner rotor (50) of the oil pump facing the pump body (10) is provided with an annular pressure-matching cavity B (51). The inner and outer diameters and depths of the pressure-matching cavity A (21) and the pressure-matching cavity B (51) are equal. The vacuum pump rotor (60) is connected to the driving shaft (40) by a flat key. An annular groove (17) is provided around the corresponding shaft hole on the bottom surface of the vacuum pump chamber (12). A semi-annular lubricating oil groove (13) is provided on the side wall of the annular groove (17). The center point of the lubricating oil groove (13) forms a 45° angle with the radial bisector of the vacuum pump chamber (12). An upper exhaust port (14) and a lower exhaust port (15) are provided on the side wall of the vacuum pump chamber (12) at a position corresponding to the exhaust end, and a reverse exhaust port (16) is also provided at a position parallel to the upper exhaust port (14).

2. The double pump composed of an oil pump and a vacuum pump according to claim 1, characterized in that: The pressure distribution chamber A (21) and the pressure distribution chamber B (51) both draw oil from the high-pressure chamber of the oil pump.

3. The double pump composed of an oil pump and a vacuum pump according to claim 1, characterized in that: The position of the lubricating oil groove (13) in the vacuum pump chamber (12) is opposite to the positions of the upper and lower exhaust ports.

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