Oil pump

Abstract

The utility model belongs to the technical field of pumps, and particularly relates to an oil pump, which comprises a stator and a rotor, a rotating shaft; the rotor is provided with a guide groove penetrating through the peripheral wall of the rotor in the radial direction, and the bottom of the guide groove is provided with a through hole; the blades extend out of or retract into the guide grooves in the radial direction of the rotor; one end of the spring abuts against the root of the blade; the thrust ball is arranged in the through hole, one side of the thrust ball abuts against the other end of the spring, and the other side of the thrust ball abuts against the rotating shaft. According to the oil pump, one end of the spring abuts against the root of the blade, the other end of the spring abuts against the spherical surface of one side of the thrust ball, the thrust ball can rotate, the spring can move on the spherical surface of the thrust ball, the phenomenon of spring distortion can be repaired, and then the problem of spring clamping stagnation is solved; the thrust ball extends out of the through hole and abuts against the peripheral wall of the rotating shaft, acting force can be applied to the rotating shaft, the rotating shaft can be kept centered easily, and assembling is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of pumps, in particular to an oil pump. Background Art

[0002] In the transmission case of mechanical equipment, an oil pump is typically used to pump lubricating oil to the desired location. Some oil pumps consist of a fixed stator and an eccentric rotor. The rotor is equipped with radially retractable blades, which absorb and discharge oil by varying the spacing between the blades.

[0003] The oil pump's blades extend and retract under the combined action of centrifugal force and a spring. One end of the spring abuts the root of the blade, while the other end is locked inside the rotor. During operation, the blades must not only rotate circumferentially with the rotor but also move radially. The force transmitted from the blades to the spring is complex, and the limited degrees of freedom at either end of the spring can easily cause the spring to twist and become stuck, impacting oil delivery. Utility Model Content

[0004] In order to improve the problem that the spring is prone to getting stuck, the utility model provides an oil pump.

[0005] An embodiment of the present utility model provides an oil pump, comprising:

[0006] a stator, which is in the shape of a ring;

[0007] a rotating shaft, one end of which is rotatably extended into the inner side of the stator;

[0008] a rotor having an annular shape and being eccentrically disposed with respect to the stator, the rotor being fixedly sleeved on the rotating shaft so as to rotate inside the stator; the rotor being provided with a guide groove radially extending through its outer peripheral wall, and a through hole being provided at the bottom of the guide groove extending through the inner peripheral wall of the rotor;

[0009] a blade movably disposed in the guide groove, the blade extending out of or retracting into the guide groove in the radial direction of the rotor, and the top of the blade being capable of abutting against the inner circumferential wall of the stator;

[0010] a spring, one end of which abuts against the root of the blade, for cooperating with the centrifugal force generated when the blade rotates to push the blade out;

[0011] A thrust ball is arranged in the through hole, one side of the thrust ball abuts against the other end of the spring, and the other side of the thrust ball abuts against the outer peripheral wall of the rotating shaft.

[0012] In some embodiments, the guide groove passes through both end surfaces of the rotor along both sides of the rotor's axial direction.

[0013] In some embodiments, the diameter of the spring is larger than the distance between the two side walls of the guide groove along the circumference of the rotor, and avoidance grooves are provided on the two side walls of the guide groove along the circumference of the rotor, and the spring is accommodated in the avoidance grooves.

[0014] In some embodiments, the longitudinal direction of the avoidance groove extends along the radial direction of the rotor, and the transverse profile of the avoidance groove is in an arc shape.

[0015] In some embodiments, a first boss extending inward is provided at the notch of the guide groove, and a second boss is provided on the root side of the blade corresponding to the first boss. The second boss can abut against the first boss to limit the blade from sliding out of the notch of the guide groove along the radial direction of the rotor.

[0016] In some embodiments, the top of the blade is rounded so that the top of the blade is in linear contact with the inner peripheral wall of the stator.

[0017] In some embodiments, a receiving groove is provided near the root side of the blade, and the receiving groove is used to receive the corresponding end of the spring.

[0018] In some embodiments, the oil pump further includes a cylindrical housing, and the stator is integrally formed inside the housing.

[0019] In some embodiments, the stator is located on the inner side of one end portion of the housing, and a shaft sleeve is integrally formed on the side of the stator facing the interior of the housing, and the rotating shaft is rotatably disposed in the shaft sleeve.

[0020] In some embodiments, brackets are provided on the outside of the shell along a circumferential array, and the shell is fixed by the brackets.

[0021] The oil pump of the present invention enables one end of the spring to abut against the root of the blade, and the other end to abut against the spherical surface of one side of the thrust ball. The thrust ball itself can rotate, and the spring can move on the spherical surface of the thrust ball, which helps to repair the spring distortion and thus improve the problem of spring sticking; the thrust ball extends out of the through hole and abuts against the outer peripheral wall of the rotating shaft, which can apply a force to the rotating shaft, helps to keep the rotating shaft centered, and facilitates assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the structure of the oil pump of this embodiment;

[0023] Figure 2 Schematic diagram of the internal structure of the oil pump of this embodiment;

[0024] Figure 3 Schematic diagram of the internal structure of the rotor of this embodiment.

[0025] In the figure: housing 10; stator 11; sleeve 12; rotor 20; guide groove 21; first boss 22; avoidance groove 23; through hole 24; blade 30; second boss 31; receiving groove 32; rotating shaft 40; spring 50; thrust ball 60; bracket 70. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and 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.

[0027] The structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented. Any structural modifications, changes in proportional relationships, or adjustments in size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0028] Terms such as "upper," "lower," "left," "right," "center," "longitudinal," "transverse," "horizontal," "inner," "outer," "radial," and "circumferential" used in this specification to indicate positions or locations are based on those shown in the accompanying drawings and are intended solely for ease of description. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and are therefore not to be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

[0029] like Figure 1 and Figure 2 As shown, this embodiment provides an oil pump, which includes a cylindrical housing 10, with a sleeve 12 and a stator 11 integrally formed inside the housing 10; the stator 11 is annular, and a rotatable shaft 40 is passed through the sleeve 12. One end of the shaft 40 extends into the inner side of the stator 11, and the other end is connected to a power source to receive torque. A rotatable rotor 20 and blades 30 are provided inside the stator 11. The rotor 20 is annular and eccentrically arranged with respect to the stator 11. The inner circumferential wall of the rotor 20 is fixedly connected to the outer circumferential wall of the portion of the shaft 40 extending into the stator 11, so that the rotor 20 and the blades 30 on the rotor 20 can rotate inside the stator 11 following the shaft 40. Brackets 70 are arranged in a circumferential array on the outside of the housing 10. The housing 10 is mounted on other components through the brackets 70 to ensure that the stator 11 remains fixed.

[0030] The sleeve 12 of this embodiment communicates with the inner side of the stator 11, allowing the rotating shaft 40 disposed within the sleeve 12 to extend into the inner side of the stator 11. The stator 11 is positioned near one end of the housing 10, while the sleeve 12 is positioned near the middle of the housing 10, facilitating assembly of the rotor 20 and blades 30 within the inner side of the stator 11. It should be noted that the arrangement of the stator 11, rotor 20, blades 30, and rotating shaft 40 of this embodiment is based on prior art. The number of blades 30 and brackets 70 of the oil pump can be adjusted based on actual needs and will not be described in detail in this embodiment.

[0031] The rotor 20 of this embodiment is provided with a plurality of guide grooves 21 along its radial direction. The blades 30 are movably provided in the guide grooves 21 so that the blades 30 can extend or retract into the guide grooves 21 along the radial direction of the rotor 20. A spring 50 and a thrust steel ball are also provided in the guide groove 21. One end of the spring 50 abuts against the root of the blade 30, and the other end of the spring 50 abuts against the thrust steel ball. A through hole 24 is provided at the bottom of the guide groove 21 and extends through the inner circumferential wall of the rotor 20. The thrust steel ball is provided in the through hole 24 and can extend through the through hole 24 and abut against the outer circumferential wall of the rotating shaft 40. The spring 50 cooperates with the centrifugal force exerted on the blade 30 during its rotation to push the blade 30 out of the guide groove 21, so that the top of the blade 30 abuts against the inner circumferential wall of the stator 11.

[0032] During oil pump operation, the rotating shaft drives the rotor 20 and its blades 30 to rotate. Centrifugal force and spring 50 cause the blades 30 to contact the inner annular wall of the stator 11. Because the stator 11 and rotor 20 are eccentrically positioned, there is a difference in the distance between the rotor 20's center of rotation and the inner annular wall of the stator 11. As the rotor 20 rotates, the blades 30 move radially within the guide grooves 21 to accommodate this difference in distance, causing the volume of the enclosed space between adjacent blades 30 to change. As the volume of the enclosed space increases, a low pressure forms within the enclosed space, drawing oil in. As the volume of the enclosed space decreases, a high pressure forms within the enclosed space, expelling the oil.

[0033] Because blades 30 need to rotate circumferentially and move radially along rotor 20, in this embodiment, one end of spring 50 abuts the root of blade 30, and the other end abuts the spherical surface of a thrust ball 60. The thrust ball 60 itself is capable of rotation, and the spring 50 can move on the spherical surface of the thrust ball 60, which helps to correct the distortion of the spring 50 and thereby alleviate the problem of spring 50 sticking. The thrust ball 60 extends through the through hole 24 and abuts the outer peripheral wall of the shaft 40, exerting force on the shaft 40, helping to maintain the shaft 40's centering and facilitating assembly.

[0034] The top of the blade 30 of this embodiment is rounded. This rounded corner design allows the top of the blade 30 to be in linear contact with the inner circumferential wall of the stator 11, ensuring that the top of the blade 30 can fully contact the inner circumferential wall of the stator 11 without causing excessive concentrated stress between the two. This helps to increase the service life of the blade 30 and alleviate the problem of the blade 30 getting stuck during rotation. The blade 30 of this embodiment is provided with a receiving groove 32 near the root side. The receiving groove 32 is used to accommodate the end of the spring 50 near the blade 30. When the end of the spring 50 is assembled into the receiving groove 32, the end of the spring 50 can be limited to prevent the end of the spring 50 from being detached.

[0035] See Figure 3 In this embodiment, the notch of the guide groove 21 is located on the outer peripheral wall of the rotor 20. The guide groove 21 passes through the two end surfaces of the rotor 20 along both sides of the axial direction of the rotor 20, so that the blade 30 can be embedded in the guide groove 21 from the axial direction of the rotor 20, so as to facilitate the assembly of the blade 30 into the guide groove 21.

[0036] In this embodiment, a first boss 22 extending toward the inside of the guide groove 21 is provided at the notch of the guide groove 21, and the first boss 22 forms a closing structure at the notch of the guide groove 21; in this embodiment, a second boss 31 is provided corresponding to the first boss 22 near the root side of the blade 30, so that the blade 30 has a shape with a small top and a large bottom. When the blade 30 extends to the maximum, the second boss 31 can abut against the first boss 22, thereby limiting the blade 30 from slipping out of the notch of the guide groove 21 along the radial direction of the rotor 20.

[0037] In this embodiment, the diameter of the spring 50 is greater than the distance between the two circumferential walls of the guide slot 21 along the rotor 20. Avoidance grooves 23 are provided on the two circumferential walls of the guide slot 21 to prevent interference between the spring 50 and the guide slot 21. Specifically, the longitudinal direction of the avoidance groove 23 extends radially along the rotor 20, and the transverse profile of the avoidance groove 23 is preferably arc-shaped. The inner wall of the avoidance groove 23 is smooth and can limit the spring 50, preventing it from slipping out of the guide slot 21 on both sides along the axial direction of the rotor 20.

[0038] The oil pump of this embodiment can be applied to different fields. For example, the oil pump can be applied to the transmission box of new energy vehicles to ensure smooth supply of lubricating oil and lubrication effect in the transmission box.

[0039] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. An oil pump, characterized in that: include: a stator (11) in the shape of a circular ring; a rotating shaft (40), one end of which is rotatably extended into the inner side of the stator (11); The rotor (20) is annular and eccentrically arranged with respect to the stator (11). The rotor (20) is fixedly sleeved on the rotating shaft (40) to rotate inside the stator (11). The rotor (20) is provided with a guide groove (21) extending radially through its outer peripheral wall. A through hole (24) is provided at the bottom of the guide groove (21) extending through the inner peripheral wall of the rotor (20). a blade (30) movably disposed in the guide groove (21), the blade (30) extending from or retracting into the guide groove (21) along the radial direction of the rotor (20), and the top of the blade (30) being capable of abutting against the inner peripheral wall of the stator (11); A spring (50), one end of which abuts against the root of the blade (30) to push the blade (30) out in response to the centrifugal force generated when the blade (30) rotates; A thrust ball (60) is arranged in the through hole (24), one side of the thrust ball (60) abuts against the other end of the spring (50), and the other side of the thrust ball (60) abuts against the outer peripheral wall of the rotating shaft (40).

2. The oil pump according to claim 1, characterized in that: The guide groove (21) passes through both end surfaces of the rotor (20) along both sides of the axial direction of the rotor (20).

3. The oil pump according to claim 2, characterized in that: The diameter of the spring (50) is greater than the distance between the two side walls of the guide groove (21) along the circumference of the rotor (20); the guide groove (21) is provided with avoidance grooves (23) on the two side walls along the circumference of the rotor (20); and the spring (50) is accommodated in the avoidance grooves (23).

4. The oil pump according to claim 3, characterized in that: The longitudinal direction of the avoidance groove (23) extends along the radial direction of the rotor (20), and the transverse profile of the avoidance groove (23) is in an arc shape.

5. The oil pump according to any one of claims 1 to 4, characterized in that: A first boss (22) extending inward is provided at the notch of the guide groove (21), and a second boss (31) is provided on the root side of the blade (30) corresponding to the first boss (22), and the second boss (31) can abut against the first boss (22) to limit the blade (30) from sliding out of the notch of the guide groove (21) along the radial direction of the rotor (20).

6. The oil pump according to any one of claims 1 to 4, characterized in that: The top of the blade (30) is rounded so that the top of the blade (30) is in linear contact with the inner peripheral wall of the stator (11).

7. The oil pump according to any one of claims 1 to 4, characterized in that: The blade (30) is provided with a receiving groove (32) near the root side, and the receiving groove (32) is used to receive the corresponding end of the spring (50).

8. The oil pump according to any one of claims 1 to 4, characterized in that: It also includes a cylindrical shell (10), and the stator (11) is integrally formed inside the shell (10).

9. The oil pump according to claim 8, characterized in that: The stator (11) is located inside one end of the housing (10), and a shaft sleeve (12) is integrally formed on the side of the stator (11) facing the inside of the housing (10), and the rotating shaft (40) is rotatably inserted into the shaft sleeve (12).

10. The oil pump according to claim 8, characterized in that: Brackets (70) are arranged on the outside of the shell (10) along a circumferential array, and the shell (10) is fixed by the brackets (70).

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