Variable displacement oil pump capable of preventing eccentric wear

Abstract

The utility model discloses a variable displacement oil pump capable of preventing eccentric wear, which comprises a swing ring and a pump cover fixedly arranged on a pump body, a pump cavity matched with the swing ring is arranged between the pump body and the pump cover, a discharge channel communicated with the pump cavity is arranged on the pump body, and an inlet channel communicated with the pump cavity is arranged on the pump cover. The discharge channel and the inlet channel are arranged on the two sides of the swing ring respectively, a pump core assembly matched with the inner wall of the swing ring is arranged in the pump cavity, a pressure oil pressure equalizing groove and an oil suction pressure equalizing groove are formed in the end of the inner wall of the swing ring, the pressure oil pressure equalizing groove is not arranged in a penetrating mode and matched with the discharge channel, and the oil suction pressure equalizing groove is arranged in a penetrating mode and matched with the inlet channel. The oil pressure equalizing groove and the oil suction equalizing groove are formed in the end portions of the two ends of the inner wall of the swing ring, under the action of the oil pressure equalizing groove and the oil suction equalizing groove, an inlet is not cavitated, the pressure of an outlet is not too large, pressure balance of the two sides can be effectively guaranteed, eccentric wear to a pump body and a pump cover is avoided, and the service life of the oil pump is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of oil pumps, in particular to a variable displacement oil pump capable of preventing eccentric wear. Background Art

[0002] In the prior art, the oil suction chamber and the oil pressure chamber are separated by a swing ring in the oil pump, and the inner hole of the swing ring in the prior art is a complete cylindrical surface. Under normal circumstances (both the pump body and the pump cover have oil circuits), there is no effect on the pump. However, when there is no oil circuit in the pump cover or the pump body, oil suction and oil pressure can only be performed from one side. At this time, the inlet and outlet flow rates will be twice that of the case of double-sided oil suction and oil pressure, which can easily cause inlet cavitation and excessive outlet pressure pulsation. The pressure on both sides is unbalanced, which can easily lead to eccentric wear between the swing ring and the pump body and pump cover, and have a serious impact on the service life of the oil pump. Utility Model Content

[0003] The utility model aims to overcome the deficiencies of the prior art and provide a variable displacement oil pump capable of preventing eccentric wear.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A variable displacement oil pump for preventing eccentric wear, comprising a pump body, a pump cover, a swing ring, an adjusting spring, a sealing shaft, a sealing assembly and a pump core assembly, wherein the pump cover is fixedly arranged on the pump body and is sealed with the pump body, a pump chamber matched with the swing ring is arranged between the pump body and the pump cover, a discharge channel connected with the pump chamber is arranged on the pump body, an inlet channel connected with the pump chamber is arranged on the pump cover, the discharge channel and the inlet channel are respectively arranged on both sides of the swing ring, a support arm is fixedly arranged on the side wall of the swing ring, the support arm is in contact with one end of the adjusting spring, and the The adjusting spring is arranged in the spring cavity on the pump body, the spring cavity is connected with the pump cavity and is arranged close to the inlet channel side, the outer wall of the swing ring is arranged on the inner wall of the pump cavity through the sealing shaft, the sealing shaft is arranged opposite to the support arm, the sealing assembly is arranged on the end of the support arm, the pump core assembly matched with the inner wall of the swing ring is arranged in the pump cavity, the inner wall end of the swing ring is provided with a pressure oil equalizing groove and a suction oil equalizing groove, the pressure oil equalizing groove is not arranged through and matched with the discharge channel, and the suction oil equalizing groove is arranged through and matched with the inlet channel.

[0006] Furthermore, the pump core assembly includes a transmission shaft, a rotor, blades and a retaining ring, one end of the transmission shaft is rotatably set on the pump cover, the other end of the transmission shaft passes through the pump body and extends to the outside of the pump body, the rotor is coaxially fixed on the transmission shaft, at least two sliding grooves are evenly arranged on the outer wall of the rotor, the blades are slidably set in the sliding grooves and the outer side walls cooperate with the inner wall of the swing ring, the retaining rings that cooperate with the inner side walls of the blades are arranged on both ends of the rotor, and the retaining rings are coaxially arranged with the swing ring.

[0007] Further, one end of the swing ring and the blade is in contact with the pump body, and the other end of the swing ring and the blade is in contact with the pump cover.

[0008] Furthermore, a first groove cooperating with the sealing shaft is provided on the inner wall of the pump chamber, and a second groove cooperating with the sealing shaft is provided on the swing ring.

[0009] Furthermore, the sealing assembly includes an extrusion rod and a sealing plate, a mounting groove is provided on the end of the support arm, the extrusion rod is arranged at the bottom of the mounting groove, and the sealing plate is arranged at the opening of the mounting groove and seals with the arc-shaped wall of the spring cavity.

[0010] Furthermore, a pressure relief channel is provided on the discharge channel, a sealing ball and a pressure relief spring are provided on the pressure relief channel, the sealing ball is seal-arranged on the inlet of the pressure relief channel, one end of the pressure relief spring is in contact with the sealing ball, and the other end is in contact with the pump cover, and an oil unloading port is provided on the side wall of the pressure relief channel.

[0011] Furthermore, seven blades are evenly arranged on the rotor.

[0012] Furthermore, an oil control channel is provided between the pump body and the pump cover, the support arm is provided between the oil control channel and the regulating spring, and a solenoid valve for controlling the on-off of the oil control channel is fixedly provided on the pump cover.

[0013] Furthermore, a pressure regulating chamber is formed between the end of the spring chamber and the support arm.

[0014] Furthermore, the sealing assembly is provided on the outer wall of the swing ring, and the pressure regulating chamber is provided between the sealing assembly and the support arm.

[0015] The beneficial effects of the utility model are:

[0016] 1) In the present technology, an oil pressure equalizing groove and an oil suction pressure equalizing groove are provided on the ends of the inner wall of the swing ring. Under the action of the oil pressure equalizing groove and the oil suction pressure equalizing groove, the inlet is not cavitated and the outlet pressure is not too large, which can effectively ensure the pressure balance on both sides, will not cause eccentric wear on the pump body and the pump cover, and extend the service life of the oil pump.

[0017] 2) In the present technology, two sets of sealing assemblies are provided so that the swing ring can be better adjusted.

[0018] 3) In this technology, the provision of a blocking ball and a pressure relief spring can better ensure that the oil pressure on the discharge channel is in a stable state. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The three-dimensional structure of the variable displacement oil pump Figure 1 ;

[0020] Figure 2 The three-dimensional structure of the variable displacement oil pump Figure 2 ;

[0021] Figure 3 This is the internal connection structure diagram of the variable displacement oil pump;

[0022] Figure 4 The figure is a structural diagram of the rotor in the swing ring;

[0023] Figure 5 This is a cross-sectional structural diagram of the variable displacement oil pump;

[0024] In the figure, 1-pump body, 2-pump cover, 3-swing ring, 4-adjusting spring, 5-sealing shaft, 6-discharge channel, 7-inlet channel, 8-support arm, 9-pressure oil equalizing groove, 10-suction oil equalizing groove, 11-transmission shaft, 12-rotor, 13-blade, 14-retaining ring, 15-extrusion rod, 16-sealing plate, 17-sealing ball, 18-pressure relief spring, 19-oil unloading port, 20-oil control channel, 21-solenoid valve, 22-pressure regulating chamber. DETAILED DESCRIPTION

[0025] The following will be combined with the embodiments to clearly and completely describe the technical solution 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 those skilled in the art without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1-Figure 5 , the utility model provides a technical solution:

[0027] A variable displacement oil pump for preventing eccentric wear, comprising a pump body 1, a pump cover 2, a swing ring 3, an adjusting spring 4, a sealing shaft 5, a sealing assembly and a pump core assembly, wherein the pump cover 2 is fixedly arranged on the pump body 1 and is sealed with the pump body 1, a pump cavity matched with the swing ring 3 is arranged between the pump body 1 and the pump cover 2, a discharge channel 6 communicating with the pump cavity is arranged on the pump body 1, an inlet channel 7 communicating with the pump cavity is arranged on the pump cover 2, the discharge channel 6 and the inlet channel 7 are respectively arranged on both sides of the swing ring 3, a support arm 8 is fixedly arranged on the side wall of the swing ring 3, and the support arm 8 is connected to one side of the adjusting spring 4. The end of the swing ring 3 is in contact with the end, and the regulating spring 4 is arranged in the spring cavity on the pump body 1. The spring cavity is connected with the pump cavity and is arranged near the side of the inlet channel 7. The outer wall of the swing ring 3 is arranged on the inner wall of the pump cavity through the sealing shaft 5. The sealing shaft 5 is arranged opposite to the support arm 8. The end of the support arm 8 is provided with a sealing component. The pump cavity is provided with a pump core component that matches the inner wall of the swing ring 3. The end of the inner wall of the swing ring 3 is provided with a pressure oil equalizing groove 9 and an suction oil equalizing groove 10. The pressure oil equalizing groove 9 is not set through and matches the discharge channel 6. The suction oil equalizing groove 10 is set through and matches the inlet channel 7. A sealing component is set on the outer wall of the swing ring 3, and the pressure regulating cavity 22 is set between the sealing component and the support arm 8. The pressure regulating cavity 22 is formed between the end of the spring cavity and the support arm 8. Among them, the ends of the inner wall of the swing ring 3 are provided with pressure oil equalizing grooves 9 and suction oil equalizing grooves 10. The pump cover 2 is fixed to the pump body 1 by bolts. The engine oil is pressurized under the action of the swing ring 3 and the pump core assembly. The engine oil enters the pump cavity from the inlet channel 7, and then enters the swing ring 3 through the suction oil equalizing groove 10. Then, it is pressurized under the action of the pump core assembly, so that the engine oil passes through the pressure oil equalizing groove 9 and is discharged from the discharge channel 6. The function of the sealing shaft 5 is to facilitate the rotation of the swing ring 3 around the sealing shaft 5. One end of the sealing shaft 5 is arranged in the pump body 1, and the other end is arranged in the pump cover 2. Under the action of the adjusting spring 4, the support arm 8, the sealing assembly and the oil control channel 20, the rotation of the swing ring 3 is jointly controlled. The width of the pressure oil equalizing groove 9 is 1 / 3 of the thickness of the entire swing ring 3, and the groove angle is 180°*(1-2 / Z)-5° to 180°*(1-2 / Z)-15°, where Z is the number of blades 13; the width of the suction oil equalizing groove 10 is the thickness of the entire swing ring, and the groove angle is 180°*(1-2 / Z) to 180°*(1-2 / Z)+10°, where Z is the number of blades 13.

[0028] In some embodiments, the pump core assembly includes a transmission shaft 11, a rotor 12, a blade 13 and a retaining ring 14. One end of the transmission shaft 11 is rotatably set on the pump cover 2, and the other end of the transmission shaft 11 extends through the pump body 1 to the outside of the pump body 1. The rotor 12 is coaxially fixedly set on the transmission shaft 11. At least two sliding grooves are evenly arranged on the outer wall of the rotor 12. The blade 13 is slidably set in the sliding groove and the outer wall cooperates with the inner wall of the swing ring 3. The retaining ring 14 that cooperates with the inner wall of the blade 13 is set on both ends of the rotor 12, and the retaining ring 14 is coaxially arranged with the swing ring 3. One end of the swing ring 3 and the blade 13 contacts the pump body 1, and the other end of the swing ring 3 and the blade 13 contacts the pump cover 2. Seven blades 13 are evenly arranged on the rotor 12. When the transmission shaft 11 rotates, the rotor 12 rotates synchronously, and when the rotor 12 rotates, the blades 13 rotate. Under the action of the retaining ring 14, the blades 13 and the inner wall of the swing ring 3 are always in a matching state. Under the action of the blades 13, the oil is pressurized and discharged from the discharge channel 6. The transmission shaft 11 and the pump body 1 are sealed.

[0029] In some embodiments, a first groove matching the sealing shaft 5 is provided on the inner wall of the pump chamber, and a second groove matching the sealing shaft 5 is provided on the swing ring 3. The first groove and the second groove are both semicircular grooves and are sealed with the sealing shaft 5.

[0030] In some embodiments, the sealing assembly includes a squeeze stick 15 and a sealing plate 16. A mounting groove is provided on the end of the support arm 8. The squeeze stick 15 is provided at the bottom of the mounting groove. The sealing plate 16 is provided at the opening of the mounting groove and is sealed with the arc-shaped wall of the spring cavity. The sealing plate 16 is an elastic rubber plate. With the cooperation of the squeeze stick 15 and the sealing plate 16, the cross section of the squeeze stick 15 is circular. Such a configuration can achieve sealing and prevent the swing ring 3 from being stuck when rotating.

[0031] In some embodiments, a pressure relief channel is provided on the discharge channel 6, and a sealing ball 17 and a pressure relief spring 18 are provided on the pressure relief channel. The sealing ball 17 is sealingly provided on the entrance of the pressure relief channel, one end of the pressure relief spring 18 contacts the sealing ball 17, and the other end contacts the pump cover 2, and an oil discharge port 19 is provided on the side wall of the pressure relief channel. Among them, the sealing ball 17 and the pressure relief spring 18 are provided on the pressure relief channel. When the oil pressure on the discharge channel 6 is too large, the oil pressure on the discharge channel 6 acts on the sealing ball 17 to compress the pressure relief spring 18. After the sealing ball 17 moves, a gap is formed, and part of the engine oil is discharged from the oil discharge port 19 after passing through the gap. When the oil pressure in the discharge channel 6 returns to normal, the sealing ball 17 continues to seal under the action of the pressure relief spring 18, thereby achieving the purpose of pressure relief.

[0032] In some embodiments, an oil control channel 20 is provided between the pump body 1 and the pump cover 2, the support arm 8 is provided between the oil control channel 20 and the adjusting spring 4, and a solenoid valve 21 for controlling the on-off of the oil control channel 20 is fixedly provided on the pump cover 2. The solenoid valve 21 is a prior art, and is only used to control the on-off of the oil control channel 20. The upper outer wall of the swing ring 3 cooperates with the inner wall of the pump cavity to form a cavity. When the oil control channel 20 is filled with oil, the oil enters the cavity and compresses the adjusting spring 4, and the swing ring 3 rotates downward around the sealing shaft 5. When the oil control channel 20 is not filled with oil, the swing ring 3 rotates upward around the sealing shaft 5 under the action of the adjusting spring 4. When the oil control channel 20 is sealed, the swing ring 3 is fixed and does not rotate.

[0033] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation", "hinge" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0035] The above is only a preferred embodiment of the utility model. It should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A variable displacement oil pump for preventing eccentric wear, characterized in that: The pump comprises a pump body (1), a pump cover (2), a swing ring (3), an adjusting spring (4), a sealing shaft (5), a sealing assembly and a pump core assembly. The pump cover (2) is fixedly arranged on the pump body (1) and is sealed with the pump body (1). A pump chamber that is matched with the swing ring (3) is arranged between the pump body (1) and the pump cover (2). The pump body (1) is provided with a discharge channel (6) that is connected with the pump chamber. The pump cover (2) is provided with an inlet channel (7) that is connected with the pump chamber. The discharge channel (6) and the inlet channel (7) are respectively arranged on both sides of the swing ring (3). A support arm (8) is fixedly arranged on the side wall of the swing ring (3). The support arm (8) is in contact with one end of the adjusting spring (4). The regulating spring (4) is arranged in a spring cavity on the pump body (1); the spring cavity is connected to the pump cavity and is arranged close to the inlet channel (7); the outer wall of the swing ring (3) is arranged on the inner wall of the pump cavity through the sealing shaft (5); the sealing shaft (5) is arranged opposite to the support arm (8); the sealing assembly is arranged on the end of the support arm (8); the pump core assembly matched with the inner wall of the swing ring (3) is arranged in the pump cavity; the inner wall end of the swing ring (3) is provided with a pressure oil equalizing groove (9) and an oil suction equalizing groove (10); the pressure oil equalizing groove (9) is not arranged through and is matched with the discharge channel (6); the oil suction equalizing groove (10) is arranged through and is matched with the inlet channel (7).

2. A variable displacement oil pump for preventing eccentric wear according to claim 1, characterized in that: The pump core assembly comprises a transmission shaft (11), a rotor (12), a blade (13) and a retaining ring (14); one end of the transmission shaft (11) is rotatably arranged on the pump cover (2); the other end of the transmission shaft (11) passes through the pump body (1) and extends to the outside of the pump body (1); the rotor (12) is coaxially fixedly arranged on the transmission shaft (11); at least two sliding grooves are evenly arranged on the outer wall of the rotor (12); the blade (13) is slidably arranged in the sliding groove and the outer wall cooperates with the inner wall of the swing ring (3); the retaining ring (14) cooperating with the inner wall of the blade (13) is arranged on both ends of the rotor (12); the retaining ring (14) is coaxially arranged with the swing ring (3).

3. A variable displacement oil pump for preventing eccentric wear according to claim 2, characterized in that: One end of the swing ring (3) and the blade (13) is in contact with the pump body (1), and the other end of the swing ring (3) and the blade (13) is in contact with the pump cover (2).

4. A variable displacement oil pump for preventing eccentric wear according to any one of claims 1 to 3, characterized in that: A first groove cooperating with the sealing rotating shaft (5) is provided on the inner wall of the pump chamber, and a second groove cooperating with the sealing rotating shaft (5) is provided on the swing ring (3).

5. A variable displacement oil pump for preventing eccentric wear according to any one of claims 1 to 3, characterized in that: The sealing assembly comprises a squeezing rod (15) and a sealing plate (16); a mounting groove is arranged at the end of the support arm (8); the squeezing rod (15) is arranged at the bottom of the mounting groove; and the sealing plate (16) is arranged at the opening of the mounting groove and is sealed with the arc-shaped wall of the spring chamber.

6. A variable displacement oil pump for preventing eccentric wear according to any one of claims 1 to 3, characterized in that: The discharge channel (6) is provided with a pressure relief channel, and a sealing ball (17) and a pressure relief spring (18) are provided on the pressure relief channel. The sealing ball (17) is sealingly arranged on the inlet of the pressure relief channel, one end of the pressure relief spring (18) is in contact with the sealing ball (17), and the other end is in contact with the pump cover (2), and an oil discharge port (19) is provided on the side wall of the pressure relief channel.

7. A variable displacement oil pump for preventing eccentric wear according to claim 2 or 3, characterized in that: Seven blades (13) are evenly arranged on the rotor (12).

8. A variable displacement oil pump for preventing eccentric wear according to any one of claims 1 to 3, characterized in that: An oil control passage (20) is provided between the pump body (1) and the pump cover (2), the support arm (8) is provided between the oil control passage (20) and the regulating spring (4), and a solenoid valve (21) for controlling the on / off of the oil control passage (20) is fixedly provided on the pump cover (2).

9. A variable displacement oil pump for preventing eccentric wear according to any one of claims 1 to 3, characterized in that: A pressure regulating chamber (22) is formed between the end of the spring chamber and the support arm (8).

10. The variable displacement oil pump for preventing eccentric wear according to claim 9, characterized in that: The sealing component is arranged on the outer wall of the swing ring (3), and the pressure regulating chamber (22) is arranged between the sealing component and the support arm (8).

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