Self-lubricating structure of oil pump

Abstract

The utility model discloses a self-lubricating structure of an oil pump, which relates to the technical field of automobile engines and comprises an oil pump body, the top of the oil pump body is fixedly connected with an oil pump cover, and an oil inlet is arranged on the inner wall of the oil pump cover. The oil pump body is arranged, when the chain wheel rotates, the driving shaft and the inner rotor are driven to rotate synchronously, the outer rotor is driven by the rotation of the inner rotor to rotate simultaneously in a gear transmission mode, due to the fact that gears are meshed regularly, the oil pump body is driven to rotate synchronously, and the oil pump cover is driven to rotate synchronously. A closed area formed by tooth profiles of inner and outer rotor gears is located on one side of an oil inlet cavity, the volume space of the closed area is gradually enlarged in the rotating direction of the rotors, certain vacuum degree negative pressure is formed in the closed area, and external engine oil enters the oil inlet cavity of the engine oil pump under the action of atmospheric pressure and fills the closed area of the tooth profiles of the inner and outer rotors; the volume of the closed area reaches the maximum value, and the amount of filled engine oil reaches the maximum value.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile engines, in particular to a self-lubricating structure of an oil pump. Background Art

[0002] When the engine is working, the oil pump draws up the oil in the oil pan and forces the oil from the oil pan to the moving parts of the engine. With the development of internal combustion engine technology, the thermal efficiency of the engine is getting higher and higher. Under the same volume conditions, the output power is getting higher and higher, and the flow performance requirements of the oil pump are getting higher and higher. In order to increase the output flow of the oil pump, the volume of the oil pump needs to be increased. However, the overall volume of the engine does not allow the oil pump to occupy more space, which creates a contradiction. Utility Model Content

[0003] The purpose of the utility model is to provide a self-lubricating structure of an oil pump, which solves the problem that the existing equipment cannot increase the output power under the same volume conditions, does not need to increase the volume of the oil pump, and cannot improve its flow performance through the oil pump body.

[0004] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0005] The utility model is a self-lubricating structure of an oil pump, comprising an oil pump body, the top of the oil pump body is fixedly connected to an oil pump cover, the inner wall of the oil pump cover is provided with an oil inlet, the inner walls of the oil pump body and the oil pump cover are both provided with a plurality of oil inlet pipe threaded holes, the inner walls of the oil inlet pipe threaded holes are fixedly connected with connecting bolts, the inner wall of the oil pump body is provided with a plurality of oil pump mounting bolt holes, the inner wall of the oil pump cover is provided with an oil outlet, and the outer wall of the oil pump body is fixedly connected with a unloading valve hole.

[0006] Furthermore, the inner wall of the oil pump body is rotatably connected to a drive shaft, the bottom of the drive shaft is fixedly connected to a sprocket, the outer wall of the drive shaft is fixedly connected to an inner rotor, the outer wall of the inner rotor is rotatably connected to an outer rotor, the inner wall of the oil pump cover is provided with an oil inlet cavity, and the inner wall of the oil pump cover is provided with an oil outlet cavity.

[0007] Furthermore, a gear box hole is formed on the inner wall of the oil pump cover, a plurality of pump cover mounting threaded holes are formed on the inner wall of the oil pump cover, and a plurality of oil outlet pipe mounting threaded holes are formed on the inner wall of the oil pump body.

[0008] Furthermore, a drive shaft hole is opened on the inner wall of the oil pump body, a plunger is fixedly connected to the inner wall of the drive shaft hole, a spring is fixedly connected to the outer wall of the plunger, and a screw plug is fixedly connected to the outer wall of the spring away from the plunger.

[0009] Furthermore, the inner wall of the inner rotor is provided with an oil chamber inlet and outlet separation zone, the inner wall of the inner rotor is provided with an inner rotor tooth profile, the inner wall of the outer rotor is provided with an outer rotor tooth profile, and the inner wall of the outer rotor is provided with an inner and outer rotor tooth profile closed area.

[0010] Furthermore, a fixed shaft is fixedly connected to the inner wall of the pump cover mounting threaded hole, a plurality of connecting cavities are opened on the inner wall of the oil pump body, and a plurality of extrusion cavities are opened on the inner wall of the fixed shaft.

[0011] Furthermore, a plurality of extrusion springs are fixedly connected to the inner wall of the extrusion cavity, an extrusion plate is fixedly connected to the outer wall of the extrusion spring, and an extrusion arc block is fixedly connected to the outer wall of the extrusion plate.

[0012] The utility model has the following beneficial effects:

[0013] 1. The utility model is provided with an oil pump body. When the sprocket rotates, the drive shaft and the inner rotor are driven to rotate synchronously. The outer rotor rotates simultaneously in a gear transmission manner under the rotation drive of the inner rotor. Due to the gear meshing law, the closed area formed by the gear tooth profiles of the inner and outer rotors is on one side of the oil inlet chamber. Its volume space gradually expands along the rotation direction of the rotor, and a certain vacuum negative pressure is formed inside. The external oil enters the oil inlet chamber of the oil pump under the action of atmospheric pressure and fills the closed area of ​​the inner and outer rotor tooth profiles. In the inner and outer rotor dividing zone area, the closed area volume reaches the maximum. The filled oil amount reaches the maximum value. With the rotation of the inner and outer rotors, the closed area of ​​the inner and outer rotor tooth profiles enters one side of the oil outlet chamber. Due to the gear meshing law, when the closed area formed by the inner and outer rotor gear tooth profiles is on one side of the oil outlet chamber, its volume space gradually decreases along the direction of rotor rotation, and a higher pressure is formed inside. Under the action of pressure, the oil in the closed area is squeezed into the oil outlet chamber, the pressure in the oil outlet chamber increases, and the oil is further squeezed from the oil outlet chamber into the oil outlet and discharged, thereby achieving the goal of increasing the output power under the same equipment volume conditions without increasing the volume of the oil pump.

[0014] 2. The utility model provides an unloading valve hole, and the end face of the plunger in the unloading valve hole of the oil pump contacts with the high-pressure oil in the oil outlet chamber. The plunger is subjected to the axial force of the high-pressure oil. Under the pushing action of the rear end spring force, the plunger remains motionless, the oil inlet chamber and the oil outlet chamber remain disconnected, and all the high-pressure oil is discharged from the oil outlet. When the oil pressure in the oil outlet chamber is too high, the axial force of the high-pressure oil on the plunger is greater than the rear end spring force, and the plunger begins to move toward the rear end. When the connecting hole connecting the oil inlet chamber and the connecting hole connecting the oil outlet chamber on the unloading valve hole is exposed, the oil outlet chamber and the oil inlet chamber are connected at this time, and a part of the oil in the oil outlet chamber is discharged from the oil outlet, and a part of the oil enters the oil inlet chamber through the unloading valve hole. The oil pressure in the oil outlet chamber and the oil outlet no longer rises, or rises slowly until the oil pump pressure is stable. Working state, achieving a higher flow performance within the same spatial range.

[0015] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a schematic diagram of the overall structure of a self-lubricating structure of an oil pump of the utility model;

[0018] Figure 2 This is a schematic diagram of the overall internal structure of a self-lubricating structure of an oil pump of the utility model;

[0019] Figure 3 It is a right-side structural cross-sectional view of the overall self-lubricating structure of an oil pump of the utility model;

[0020] Figure 4 This is a cross-sectional view of the overall structure of a self-lubricating structure of an oil pump of the utility model;

[0021] Figure 5 This is an enlarged view of the inner rotor structure of a self-lubricating structure of an oil pump of the utility model;

[0022] Figure 6 This is a schematic diagram of the threaded hole structure for installing a pump cover of a self-lubricating structure of an oil pump according to the utility model;

[0023] Figure 7 The utility model is a schematic diagram of a fixed shaft structure of a self-lubricating structure of an oil pump.

[0024] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0025] 1. Oil pump body, 101. Oil inlet, 102. Oil inlet pipe threaded hole, 103. Oil pump cover, 104. Connecting bolts, 105. Oil pump mounting bolt holes, 106. Oil outlet, 108. Unloading valve hole, 109. Sprocket, 110. Oil inlet and outlet separation zone, 2. Drive shaft, 201. Inner rotor, 202. Outer rotor, 203. Oil inlet chamber, 204. Oil outlet chamber, 205. Gear box hole , 206, pump cover mounting threaded hole, 207, oil outlet pipe mounting threaded hole, 208, drive shaft hole, 209, plunger, 210, spring, 211, screw plug, 212, inner and outer rotor tooth profile closed area, 213, inner rotor tooth profile, 214, outer rotor tooth profile, 215, fixed shaft, 216, connecting chamber, 217, extrusion chamber, 218, extrusion spring, 219, extrusion plate, 220, extrusion arc block. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] See also Figure 1-7 As shown, the utility model is a self-lubricating structure of an oil pump, comprising an oil pump body 1, the top of the oil pump body 1 is fixedly connected to an oil pump cover 103, an inner wall of the oil pump cover 103 is provided with an oil inlet 101, the inner walls of the oil pump body 1 and the oil pump cover 103 are both provided with a plurality of oil inlet pipe threaded holes 102, the inner walls of the oil inlet pipe threaded holes 102 are fixedly connected with connecting bolts 104, the inner wall of the oil pump body 1 is provided with a plurality of oil pump mounting bolt holes 105, the inner wall of the oil pump cover 103 is provided with an oil outlet 106, and the outer wall of the oil pump body 1 is fixedly connected with an unloading valve hole 108;

[0028] There are two bolt through holes on the oil pump body 1 for installing and fixing the oil pump on the engine. There is a drive shaft hole 208 on the oil pump body 1, and a gear box hole 205 that is not concentric with the shaft hole is provided on one side of the drive shaft hole 208. The two sides of the box hole are the oil inlet chamber 203 and the oil outlet chamber 204. There is an oil outlet port 106 on one side of the oil outlet chamber 204. There are two threaded holes on the flange surface of the oil outlet port 106. There are multiple threaded holes on the outer end surface of the gear box hole 205 for connecting and installing the oil pump cover 103 and the oil pump body 1. There is a unloading valve hole 108 on the oil pump body 1 to connect the oil inlet chamber 203 and the oil outlet chamber 204.

[0029] Among them Figure 2As shown, the inner wall of the oil pump body 1 is rotatably connected to the drive shaft 2, the bottom of the drive shaft 2 is fixedly connected to the sprocket 109, the outer wall of the drive shaft 2 is fixedly connected to the inner rotor 201, the outer wall of the inner rotor 201 is rotatably connected to the outer rotor 202, the inner wall of the oil pump cover 103 is provided with an oil inlet cavity 203, and the inner wall of the oil pump cover 103 is provided with an oil outlet cavity 204;

[0030] The drive shaft passes through the drive shaft hole of the oil pump body 1, one end is connected to the drive sprocket 109, and the other end is connected to the inner rotor 201. The drive sprocket 109 and the inner rotor 201 are fixedly connected to the drive shaft 2 by interference fit to maintain synchronous rotation.

[0031] Among them Figure 2 As shown, the inner wall of the oil pump cover 103 is provided with a gear box hole 205, the inner wall of the oil pump cover 103 is provided with a plurality of pump cover mounting threaded holes 206, and the inner wall of the oil pump body 1 is provided with a plurality of oil outlet pipe mounting threaded holes 207;

[0032] The oil pump cover 103 can be integrated into one piece through the pump cover mounting threaded hole 206 on the oil pump cover.

[0033] Among them Figure 3 As shown, a drive shaft hole 208 is opened on the inner wall of the oil pump body 1, a plunger 209 is fixedly connected to the inner wall of the unloading valve hole 108, a spring 210 is fixedly connected to the outer wall of the plunger 209, and a screw plug 211 is fixedly connected to the outer wall of the spring 210 away from the plunger 209;

[0034] A plunger 209 is installed in the unloading valve hole 108, and a spring 210 is installed at the rear end of the plunger 209. The spring 210 is compressed by the screw plug 211 at the rear end to form a certain spring force, which fixes the plunger 209 at the front end of the plunger hole. The plunger 209 can slide up and down in the plunger hole. The plunger 209 separates the originally connected oil outlet chamber 204 and the oil inlet chamber 203, so that they are not connected to each other.

[0035] Among them Figure 5 As shown, the inner wall of the inner rotor 201 is provided with an oil chamber separation zone 110, the inner wall of the inner rotor 201 is provided with an inner rotor tooth profile 213, and the inner wall of the outer rotor 202 is provided with an inner and outer rotor tooth profile closed area 212;

[0036] The tooth profiles of the inner and outer rotors are mutually conjugated large tooth height involutes, the difference in the number of teeth of the inner and outer rotors is 1, the outer rotor 202 cooperates with the inner rotor 201, and both are mounted in the gear box hole 205 of the oil pump body 1 and can rotate freely.

[0037] Among them Figure 7As shown, the inner wall of the pump cover mounting threaded hole 206 is fixedly connected with a fixed shaft 215, the inner wall of the oil pump body 1 is provided with a plurality of connecting cavities 216, and the inner wall of the fixed shaft 215 is provided with a plurality of extrusion cavities 217;

[0038] By providing a fixed shaft 215 on the pump cover mounting threaded hole 206, the device can be more stable when connected.

[0039] Among them Figure 7 As shown, the inner wall of the extrusion cavity 217 is fixedly connected with a plurality of extrusion springs 218, the outer wall of the extrusion spring 218 is fixedly connected with an extrusion plate 219, and the outer wall of the extrusion plate 219 is fixedly connected with an extrusion arc block 220;

[0040] By disposing the extrusion spring 218 in the extrusion chamber 217 , the extrusion spring 218 will be squeezed into the extrusion chamber 217 when being squeezed.

[0041] A specific application of this embodiment is:

[0042] When the device is working, the sprocket 109 rotates and drives the drive shaft 2 and the inner rotor 201 to rotate synchronously. The outer rotor 202 rotates simultaneously in a gear transmission manner under the rotation drive of the inner rotor 201. Due to the gear meshing law, the closed area formed by the gear tooth profiles of the inner and outer rotors is on one side of the oil inlet chamber 203. Its volume space gradually expands along the rotation direction of the rotors, and a certain vacuum negative pressure is formed inside. The external engine oil enters the oil inlet chamber 203 of the oil pump under the action of atmospheric pressure and fills the closed area of ​​the inner and outer rotor tooth profiles. In the inner and outer rotor dividing zone area, the volume of the closed area reaches the maximum, and the amount of engine oil filled reaches the maximum. As the inner and outer rotors rotate, the closed area of ​​the inner and outer rotor tooth profiles enters one side of the oil outlet chamber 204. Due to the gear meshing law, when the closed area formed by the inner and outer rotor gear tooth profiles is on one side of the oil outlet chamber 204, its volume space gradually decreases along the direction of rotor rotation, and a higher pressure is formed inside. Under the action of pressure, the engine oil in the closed area is squeezed into the oil outlet chamber 204, and the pressure in the oil outlet chamber 204 increases. The engine oil is further squeezed from the oil outlet chamber 204 into the oil outlet port 106 for discharge. The end face of the plunger 209 in the oil pump unloading valve hole 108 contacts the high-pressure engine oil in the oil outlet chamber 204, and the plunger 209 is subjected to the axial force of the high-pressure engine oil. Under the pushing action of the force 210, the plunger 209 remains stationary, the oil inlet chamber 203 and the oil outlet chamber 204 remain disconnected, and all the high-pressure oil is discharged from the oil outlet. When the oil pressure in the oil outlet chamber 204 is too high, the axial force of the high-pressure oil on the plunger 209 is greater than the force of the rear end spring 210, and the plunger 209 begins to move to the rear end. When the connecting hole with the oil inlet chamber 203 and the connecting hole with the oil outlet chamber 204 on the unloading valve hole 108 are exposed, the oil outlet chamber 204 and the oil inlet chamber 203 are connected at this time, and part of the oil in the oil outlet chamber 204 is discharged from the oil outlet, and part of it enters the oil inlet chamber 203 through the unloading valve hole 108. The oil pressure in the oil outlet chamber 204 and the oil outlet port no longer rises, or rises slowly until the oil pump pressure reaches a stable working state, and then when the equipment is connected, multiple fixed shafts 215 can be rotated. When the fixed shaft 215 passes through the pump cover mounting threaded hole 206, it will squeeze multiple extrusion arc blocks 220 and then squeeze the extrusion plate 219. When the extrusion plate 219 is squeezed, it will simultaneously push multiple extrusion springs 218 to squeeze it into the extrusion chamber 217. When it reaches the connecting chamber 216, the extrusion spring 218 will pop out the extrusion plate 219 so that the extrusion arc block 220 on the extrusion plate 219 is clamped with the fixed shaft 215.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0044] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A self-lubricating structure of an oil pump, comprising an oil pump body (1), characterized in that: The top of the oil pump body (1) is fixedly connected to an oil pump cover (103); an oil inlet (101) is provided on the inner wall of the oil pump cover (103); a plurality of oil inlet pipe threaded holes (102) are provided on the inner walls of the oil pump body (1) and the oil pump cover (103); connecting bolts (104) are fixedly connected to the inner walls of the oil inlet pipe threaded holes (102); a plurality of oil pump mounting bolt holes (105) are provided on the inner wall of the oil pump body (1); an oil outlet (106) is provided on the inner wall of the oil pump cover (103); and a unloading valve hole (108) is fixedly connected to the outer wall of the oil pump body (1).

2. The self-lubricating structure of an oil pump according to claim 1, characterized in that: The inner wall of the oil pump body (1) is rotatably connected to a drive shaft (2), the bottom of the drive shaft (2) is fixedly connected to a sprocket (109), the outer wall of the drive shaft (2) is fixedly connected to an inner rotor (201), the outer wall of the inner rotor (201) is rotatably connected to an outer rotor (202), the inner wall of the oil pump cover (103) is provided with an oil inlet cavity (203), and the inner wall of the oil pump cover (103) is provided with an oil outlet cavity (204).

3. The self-lubricating structure of an oil pump according to claim 2, characterized in that: The inner wall of the oil pump cover (103) is provided with a gear box hole (205), the inner wall of the oil pump cover (103) is provided with a plurality of pump cover mounting threaded holes (206), and the inner wall of the oil pump body (1) is provided with a plurality of oil outlet pipe mounting threaded holes (207).

4. The self-lubricating structure of an oil pump according to claim 3, characterized in that: The inner wall of the oil pump body (1) is provided with a drive shaft hole (208), the inner wall of the drive shaft hole (208) is fixedly connected to a plunger (209), the outer wall of the plunger (209) is fixedly connected to a spring (210), and the outer wall of the spring (210) away from the plunger (209) is fixedly connected to a screw plug (211).

5. The self-lubricating structure of an oil pump according to claim 4, characterized in that: The inner wall of the inner rotor (201) is provided with an oil chamber inlet and outlet separation zone (110), the inner wall of the inner rotor (201) is provided with an inner rotor tooth profile (213), the inner wall of the outer rotor (202) is provided with an outer rotor tooth profile (214), and the inner wall of the outer rotor (202) is provided with an inner and outer rotor tooth profile closed area (212).

6. The self-lubricating structure of an oil pump according to claim 5, characterized in that: A fixed shaft (215) is fixedly connected to the inner wall of the pump cover mounting threaded hole (206), a plurality of connecting cavities (216) are provided on the inner wall of the oil pump body (1), and a plurality of extrusion cavities (217) are provided on the inner wall of the fixed shaft (215).

7. The self-lubricating structure of an oil pump according to claim 6, characterized in that: The inner wall of the extrusion cavity (217) is fixedly connected to a plurality of extrusion springs (218), the outer wall of the extrusion spring (218) is fixedly connected to an extrusion plate (219), and the outer wall of the extrusion plate (219) is fixedly connected to an extrusion arc block (220).

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