Gear type oil pump

Abstract

The utility model provides a gear type oil pump. The gear type oil pump comprises a pump body, an outer gear, an oil suction cavity, an oil outlet cavity, a first inner gear, a second inner gear, a division sealing belt and an unloading groove. The first inner gear and the second inner gear are externally meshed to form an oil trapping cavity. The dividing sealing belt is arranged in the middle of the inner wall of the pump body in a protruding mode so as to be matched with the first inner gear and the second inner gear to divide an inner cavity of the pump body into an oil suction cavity and an oil outlet cavity. The part of the dividing sealing belt is arranged in an 8 shape, and the narrowest position of the dividing sealing belt is arranged relative to the oil trapping cavity. The unloading grooves are formed in the connecting areas, in the radial direction, of the oil suction cavity and the oil outlet cavity and the partition sealing belt correspondingly and arranged relative to the oil trapping cavity, so that the unloading grooves form a fan-shaped area. The unloading groove is communicated with the oil outlet cavity and discharges oil in the oil trapping cavity, so that the oil trapping cavity becomes smaller; and the unloading groove is communicated with the oil absorption cavity and fills the oil liquid into the oil trapping cavity, so that the oil trapping cavity becomes larger.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil pumps, in particular to a gear type oil pump. BACKGROUND

[0002] The external gear pump refers to a gear pump composed of external gear. It is mainly composed of driving gear, driven gear, pump body, pump cover and safety valve. The working principle of the external gear pump is that when the driving gear of the pump rotates, the sealed volume between the driving gear and the driven gear increases, forming a local vacuum, and the oil in the oil tank enters the gear under the action of the external atmospheric pressure, completing the oil suction. With the rotation of the gear, the oil sucked into the gear is taken to the other side and enters the oil pressure chamber. At this time, the two gears enter the engagement, and the sealed volume gradually decreases, and the oil between the gears is extruded, completing the oil pressure process of the gear pump.

[0003] In order to continuously supply oil, it is required that the overlap coefficient ε of the gear engagement is greater than 1, that is, when a pair of gears has not disengaged, another pair of gears has entered engagement; thus, there is a closed volume formed between the tooth direction engagement lines of the two pairs of gears at the moment when the two pairs of gears are engaged at the same time, and a part of the oil is also trapped in this closed volume. When the closed volume decreases, the trapped oil is extruded, the pressure rises sharply, the gear suddenly bears a large impact load, the pump vibrates violently, high-pressure oil is extruded from all possible gaps, power loss is caused, oil heating is caused, etc. When the closed volume increases, since there is no oil supplement, a local vacuum is formed, air originally dissolved in the oil is separated out, forming bubbles, and after bubbles are generated in the oil, noise, cavitation and a series of harmful effects are caused. This is the oil trapping phenomenon of the external gear pump. The oil trapping phenomenon seriously affects the working stability and service life of the pump.

[0004] Therefore, how to solve the oil trapping problem of the external gear pump in the prior art has become a problem to be solved by the technical personnel in the field. Practical new type content

[0005] The present application provides a gear type oil pump to solve the oil trapping problem of the external gear pump in the prior art.

[0006] The present application provides a gear type oil pump, comprising: a pump body and an external gear arranged outside the pump body, and an oil suction chamber and an oil outlet chamber formed inside the pump body, further comprising: a first internal gear, a second internal gear, a split sealing band and an unloading groove.

[0007] The first internal gear is connected with the external gear through a gear shaft to rotate under the driving of the external gear; the first internal gear and the second internal gear are externally engaged and form a trapped oil cavity at the engagement connection;

[0008] The split sealing band is protruded at the middle part of the inner wall of the pump body and clamps the first internal gear and the second internal gear between the split sealing bands in the axial direction of the gear shaft to split the inner cavity of the pump body into the oil suction cavity and the oil outlet cavity in cooperation with the first internal gear and the second internal gear; part of the split sealing band is arranged in an 8-shaped manner, and the narrowest part of the split sealing band arranged in the 8-shaped manner is arranged opposite to the trapped oil cavity; the axial direction is perpendicular to the radial direction of the first internal gear and the second internal gear;

[0009] The unloading groove is formed at the connection area of the oil suction cavity, the oil outlet cavity and the split sealing band in the radial direction and is arranged opposite to the trapped oil cavity to form a fan-shaped area; the unloading groove is communicated with the oil outlet cavity, the unloading groove discharges the oil in the trapped oil cavity to make the trapped oil cavity change from large to small; the unloading groove is communicated with the oil suction cavity, and the unloading groove fills the oil into the trapped oil cavity to make the trapped oil cavity change from small to large.

[0010] Optionally, the middle part of the narrowest part of the split sealing band is U-shaped along the wall opposite to the oil suction cavity and the oil outlet cavity respectively, the arc of the middle part of the U-shaped along the wall extending to both sides is a quarter of a circular arc, the middle part of the narrowest part of the split sealing band along the wall and the arc of the middle part of the wall extending to both sides are groove walls of the unloading groove, and the middle part of the wall and the arc of the wall make the unloading groove form a fan-shaped area.

[0011] Optionally, the unloading groove includes a first unloading groove and a second unloading groove, the first unloading groove is communicated with the oil outlet cavity, the first unloading groove discharges the oil in the trapped oil cavity to make the trapped oil cavity change from large to small, the second unloading groove is communicated with the oil suction cavity, and the second unloading groove fills the oil into the trapped oil cavity to make the trapped oil cavity change from small to large; correspondingly, the first unloading groove forms a first fan-shaped area, and the second unloading groove forms a second fan-shaped area.

[0012] Optionally, the pump body has oppositely arranged first and second inner walls in the axial direction, the split sealing band includes first and second split sealing bands, the first split sealing band is protruded at the first inner wall, the second split sealing band is protruded at the second inner wall, the first and second split sealing bands are opposite to each other in the axial direction, and the first and second internal gears are clamped between the first and second split sealing bands.

[0013] Optionally, the first and second split sealing bands each comprise an integral connecting portion, a split portion and an extension portion.

[0014] The connecting portion is located at the narrowest part of the split sealing band; the wall of the connecting portion is U-shaped relative to the oil suction cavity and the oil outlet cavity respectively; the wall of the connecting portion is the middle part of the U-shaped wall.

[0015] In the width direction of the pump body, the split portion is located on both sides of the connecting portion; the arc-shaped wall of the split portion is a quarter of a circle relative to the oil suction cavity and the oil outlet cavity respectively.

[0016] The extension portion extends from the split portion to the wall of the pump body respectively.

[0017] Optionally, a shaft hole is further provided, the shaft hole penetrates the first and second split sealing bands, and the shaft hole is located on the split portion respectively; the connecting line direction of the shaft hole on the split portion is the width direction of the pump body.

[0018] Optionally, an air pocket groove is further provided, the air pocket groove is recessed on the split sealing band, and is located at the connection between the split portion and the extension portion.

[0019] Optionally, the air pocket groove is located at the connection between the split portion and the extension portion of the first split sealing band and / or the first split sealing band.

[0020] The application further provides a safety belt buckle comprising the gear type oil pump as described above.

[0021] Compared with the prior art, the application has the following advantages:

[0022] The application provides a gear oil pump, which comprises a pump body, an external gear arranged outside the pump body, an oil suction cavity and an oil outlet cavity formed inside the pump body, and the gear oil pump comprises a first internal gear, a second internal gear, a split sealing belt and an unloading groove. The first internal gear is connected with the external gear through a gear shaft to rotate under the driving of the external gear. The first internal gear and the second internal gear are externally engaged and form an oil trapping cavity at the engagement connection. The split sealing belt is protrusively arranged at the middle part of the inner wall of the pump body and clamps the first internal gear and the second internal gear in the axial direction of the gear shaft to divide the inner cavity of the pump body into the oil suction cavity and the oil outlet cavity in cooperation with the first internal gear and the second internal gear. Part of the split sealing belt is arranged in an 8-shaped mode, and the narrowest part of the split sealing belt arranged in the 8-shaped mode is arranged opposite to the oil trapping cavity. The axial direction is perpendicular to the radial direction of the first internal gear and the second internal gear. The unloading groove is formed in the connection area of the oil suction cavity, the oil outlet cavity and the split sealing belt in the radial direction and is arranged opposite to the oil trapping cavity to form a fan-shaped area. The unloading groove communicates with the oil outlet cavity, the unloading groove discharges the oil in the oil trapping cavity to make the oil trapping cavity change from large to small, the unloading groove communicates with the oil suction cavity, and the unloading groove fills the oil into the oil trapping cavity to make the oil trapping cavity change from small to large.

[0023] It can be understood that, the gear oil pump provided by the application, part of the split sealing belt is arranged in an 8-shaped mode, the narrowest part of the split sealing belt arranged in the 8-shaped mode is arranged opposite to the oil trapping cavity, the unloading groove is formed in the connection area of the oil suction cavity, the oil outlet cavity and the split sealing belt in the radial direction and is arranged opposite to the oil trapping cavity to form a fan-shaped area. The unloading groove communicates with the oil outlet cavity, the unloading groove discharges the oil in the oil trapping cavity to make the oil trapping cavity change from large to small, so as to avoid the gear movement resistance caused by the incompressibility of the oil and increase the power consumption. The unloading groove communicates with the oil suction cavity, and the unloading groove fills the oil into the oil trapping cavity to make the oil trapping cavity change from small to large, so as to solve the oil trapping problem of the externally engaged gear pump in the prior art, and the power consumption of the pump can be reduced under the condition of the same performance. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a gear oil pump provided by the embodiment of the application.

[0025] Figure 2 It is a structural schematic diagram of a part of the structure of the gear oil pump provided by the embodiment of the application.

[0026] Figure 3 It is a structural schematic diagram of another part of the structure of the gear oil pump provided by the embodiment of the application.

[0027] Figure 4 It is a structural schematic diagram of a part of the structure of the gear oil pump provided by the embodiment of the application.

[0028] REFERENCE NUMERALS:

[0029] Pump body 1, first inner wall 11, second inner wall 12, external gear 2, oil suction cavity 13, oil outlet cavity 14, trapped oil cavity 15, first internal gear 3, second internal gear 4, gear shaft 5, split sealing band 6, first split sealing band 61, second split sealing band 62, middle along wall 63, arc-shaped along wall 64, connecting part 65, split part 66, extension part 67, unloading groove 7, first unloading groove 71, second unloading groove 72, shaft hole 8, air pocket groove 9, DETAILED DESCRIPTION

[0030] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the application. However, it will be apparent to one skilled in the art that the application can be practiced without the specific details set forth in this description. In other instances, well-known methods, procedures, components, and circuits have not been described in detail so as not to unnecessarily obscure aspects of the application.

[0031] In the description of the present application, it needs to be understood that the terms "upper", "lower", "left", "right", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0032] In addition, the terms "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0033] When the enclosed volume decreases, the trapped oil is extruded, the pressure rises sharply, the gear is suddenly subjected to a large impact load, the pump vibrates violently, and at this time the high-pressure oil is squeezed out of all possible gaps, causing power loss, heating of the oil, etc. When the enclosed volume increases, there is no oil to supplement, thus forming a local vacuum, causing the air originally dissolved in the oil to separate out and form bubbles. After bubbles are generated in the oil, noise, cavitation and a series of harmful effects are caused. This is the trapped oil phenomenon of the external meshing gear pump. The trapped oil phenomenon seriously affects the smoothness of the pump and the service life.

[0034] According to the gear oil pump, the part of the split sealing belt is arranged in an 8-shaped manner, the narrowest part of the part of the split sealing belt arranged in an 8-shaped manner is arranged opposite to the trapped oil cavity, the unloading groove is formed in the connection area of the oil suction cavity and the split sealing belt in the radial direction and is arranged opposite to the trapped oil cavity, so that the unloading groove forms a fan-shaped area, the unloading groove communicates with the oil outlet cavity, the unloading groove discharges the oil in the trapped oil cavity, so that the trapped oil cavity changes from large to small, the unloading groove communicates with the oil suction cavity, and the unloading groove fills the oil into the trapped oil cavity, so that the trapped oil cavity changes from small to large.

[0035] It can be understood that, according to the gear oil pump, the part of the split sealing belt is arranged in an 8-shaped manner, the narrowest part of the part of the split sealing belt arranged in an 8-shaped manner is arranged opposite to the trapped oil cavity, the unloading groove is formed in the connection area of the oil suction cavity and the split sealing belt in the radial direction and is arranged opposite to the trapped oil cavity, so that the unloading groove forms a fan-shaped area, the unloading groove communicates with the oil outlet cavity, the unloading groove discharges the oil in the trapped oil cavity, so that the trapped oil cavity changes from large to small, the unloading groove communicates with the oil suction cavity, and the unloading groove fills the oil into the trapped oil cavity, so that the trapped oil cavity changes from small to large.

[0036] Next, the gear oil pump provided by the application will be described in detail in combination with the drawings. Figure 1 FIG. 1 is a structural schematic diagram of a gear oil pump provided by an embodiment of the application. Figure 2 FIG. 2 is a structural schematic diagram of part of the gear oil pump provided by the embodiment of the application. Figure 3 FIG. 3 is a structural schematic diagram of another part of the gear oil pump provided by the embodiment of the application. Figure 4 FIG. 4 is a structural schematic diagram of part of the gear oil pump provided by the embodiment of the application.

[0037] As shown in FIG. 1, the gear oil pump comprises a pump body, an external gear arranged outside the pump body, an oil suction cavity and an oil outlet cavity formed inside the pump body, a first internal gear, a second internal gear, a split sealing belt and an unloading groove. Figures 1-4As shown in the drawings, the application provides a gear oil pump, which comprises a pump body 1, an external gear 2 arranged outside the pump body 1, an oil suction cavity 13 and an oil outlet cavity 14 formed inside the pump body 1, a first internal gear 3, a second internal gear 4, a split sealing band 6 and an unloading groove 7. The first internal gear 3 is connected with the external gear 2 through a gear shaft 5 to rotate under the driving of the external gear 2. The first internal gear 3 and the second internal gear 4 are externally engaged to form an oil trapping cavity 15 at the engagement connection. The split sealing band 6 is arranged at the middle part of the inner wall of the pump body 1 and clamps the first internal gear 3 and the second internal gear 4 in the split sealing band 6 in the axial direction of the gear shaft 5 to divide the inner cavity of the pump body 1 into the oil suction cavity 13 and the oil outlet cavity 14 in cooperation with the first internal gear 3 and the second internal gear 4. The split sealing band 6 is partially arranged in the shape of 8, and the narrowest part of the split sealing band 6 arranged in the shape of 8 is arranged opposite to the oil trapping cavity 15. The axial direction is perpendicular to the radial direction of the first internal gear 3 and the second internal gear 4. The unloading groove 7 is formed at the connection area of the oil suction cavity 13, the oil outlet cavity 14 and the split sealing band 6 in the radial direction and is arranged opposite to the oil trapping cavity 15 to form a fan-shaped area. The unloading groove 7 is communicated with the oil outlet cavity 14, the unloading groove 7 discharges the oil in the oil trapping cavity 15 to make the oil trapping cavity 15 change from large to small; the unloading groove 7 is communicated with the oil suction cavity 13, and the unloading groove 7 fills the oil into the oil trapping cavity 15 to make the oil trapping cavity 15 change from small to large.

[0038] Specifically, in the embodiment, the gear oil pump comprises a pump body 1, an external gear 2 arranged outside the pump body 1, an oil suction cavity 13 and an oil outlet cavity 14 formed inside the pump body 1, and a first internal gear 3 and a second internal gear 4. The first internal gear 3 is connected with the external gear 2 through a gear shaft 5 to rotate under the driving of the external gear 2. The second internal gear 4 is arranged inside the pump body 1 through the gear shaft 5, and the first internal gear 3 and the second internal gear 4 are externally engaged to form an oil trapping cavity 15 at the engagement connection. As shown in the drawings, the rotation direction of the first internal gear 3 is counterclockwise. In the embodiment, the pump body 1 comprises a front pump body 1 and a rear pump body 1, and the axial direction of the gear shaft 5 is arranged along the opposite direction of the front pump body 1 and the rear pump body 1. Figure 2

[0039] In the embodiment, the gear oil pump further comprises a split sealing band 6 and an unloading groove 7. The middle part of the narrowest part of the split sealing band 6 is arranged in the shape of U along the wall 63 opposite to the oil suction cavity 13 and the oil outlet cavity 14, respectively, and the arc-shaped extension of the middle part of the split sealing band 6 along the wall 63 to both sides is arranged in the shape of a quarter circle along the wall 64. The middle part of the narrowest part of the split sealing band 6 along the wall 63 and the arc-shaped extension of the middle part of the split sealing band 6 along the wall 63 to both sides are the groove walls of the unloading groove 7, and the middle part along the wall 63 and the arc-shaped extension along the wall 64 make the unloading groove 7 form a fan-shaped area.

[0040] ​In the embodiment, based on the arrangement of the oil suction cavity 13 and the oil outlet cavity 14, the unloading groove 7 comprises a first unloading groove 71 and a second unloading groove 72, wherein the first unloading groove 71 communicates with the oil outlet cavity 14, the first unloading groove 71 discharges the oil in the oil trap cavity 15, so that the oil trap cavity 15 changes from large to small, thereby avoiding the gear movement resistance caused by the incompressibility of the oil and increasing the power consumption. The second unloading groove 72 communicates with the oil suction cavity 13, and the second unloading groove 72 fills the oil into the oil trap cavity 15, so that the oil trap cavity 15 changes from small to large; the first unloading groove 71 and the second unloading groove 72 are divided by the split sealing band 6 and the first inner gear 3 and the second inner gear 4 and are not in communication. Corresponding to the shape of the unloading groove 7, the first unloading groove 71 forms a first fan-shaped area, and the second unloading groove 72 forms a second fan-shaped area. Specifically, the middle part of the narrowest part of the split sealing band 6 on the left side along the wall 63 is in a U shape relative to the oil suction cavity 13, the arc-shaped wall 64 of the middle part of the left side along the wall 63 extending to both sides in the axial direction is in a quarter circular arc, and the wall 63 of the middle part of the left side along the wall 63 and the arc-shaped wall 64 of the quarter circular arc are the groove walls of the first unloading groove 71, so that the first unloading groove 71 forms a first fan-shaped area. The middle part of the narrowest part of the split sealing band 6 on the right side along the wall 63 is in a U shape relative to the oil suction cavity 13, the arc-shaped wall 64 of the middle part of the right side along the wall 63 extending to both sides in the axial direction is in a quarter circular arc, and the wall 63 of the middle part of the right side along the wall 63 and the arc-shaped wall 64 of the quarter circular arc are the groove walls of the second unloading groove 72, so that the second unloading groove 72 forms a second fan-shaped area.

[0041] Corresponding to the pump body 1 of the present application comprising a front side pump body 1 and a rear side pump body 1, the pump body 1 has a first inner wall 11 and a second inner wall 12 oppositely arranged in the axial direction, wherein the first inner wall 11 is the inner wall of the front side pump body 1, and the second inner wall 12 is the inner wall of the rear side pump body 1. Correspondingly, the split sealing band 6 comprises a first split sealing band 61 and a second split sealing band 62, the first split sealing band 61 is protrusively arranged on the first inner wall 11, and the second split sealing band 62 is protrusively arranged on the second inner wall 12. The first split sealing band 61 and the second split sealing band 62 are opposite in the axial direction, and the first inner gear 3 and the second inner gear 4 are clamped between the first split sealing band 61 and the second split sealing band 62. Part of the first split sealing band 61 and part of the second split sealing band 62 are arranged in an 8-shaped manner. The arrangement relationship of the first inner gear 3, the second inner gear 4, the first split sealing band 61 and the second split sealing band 62 can divide the inner cavity of the pump body 1 into the oil suction cavity 13 and the oil outlet cavity 14.

[0042] Further, in the present embodiment, the first and second split sealing bands 61 and 62 each include an integral connecting portion 65, a split portion 66, and an extension portion 67. The connecting portion 65 is located at the narrowest part of the split sealing band 6, and the connecting portion 65 has a U-shaped wall portion that faces the oil suction chamber 13 and a U-shaped wall portion that faces the oil discharge chamber 14. The U-shaped wall portion of the connecting portion 65 is a middle U-shaped wall portion 63. The split portion 66 is located on both sides of the connecting portion 65 in the width direction of the pump body 1. The split portion 66 has an arc-shaped wall portion 64 that faces the oil suction chamber 13 and an arc-shaped wall portion 64 that faces the oil discharge chamber 14. The extension portion 67 extends from the split portion 66 to the wall of the pump body 1. The connecting portion 65 and the split portion 66 are arranged in an 8-shaped pattern, and the extension portion 67 extends to the wall of the pump body 1 mainly to split the oil suction chamber 13 and the oil discharge chamber 14 and to block the oil suction chamber 13 and the oil discharge chamber 14.

[0043] In the present embodiment, the shaft hole 8 is provided through the first and second split sealing bands 61 and 62, and the shaft hole 8 is located in the split portion 66. The shaft hole 8 in the split portion 66 is aligned in the width direction of the pump body 1.

[0044] In the present embodiment, the air pocket groove 9 is provided in the split sealing band 6, and the air pocket groove 9 is located at the connection between the split portion 66 and the extension portion 67. The air pocket groove 9 is located at the connection between the first split sealing band 61 and / or the split portion 66 and the extension portion 67 of the first split sealing band 61.

[0045] The application provides a gear oil pump, which comprises a pump body 1, an external gear 2 arranged outside the pump body 1, an oil suction cavity 13 and an oil outlet cavity 14 formed inside the pump body 1, and a first internal gear 3, a second internal gear 4, a split sealing band 6 and an unloading groove 7. The first internal gear 3 is connected with the external gear 2 through a gear shaft 5 and rotates under the driving of the external gear 2. The first internal gear 3 and the second internal gear 4 are externally engaged and form an oil trapping cavity 15 at the engagement connection. The split sealing band 6 is arranged at the middle of the inner wall of the pump body 1 and clamps the first internal gear 3 and the second internal gear 4 in the axial direction of the gear shaft 5, so as to divide the inner cavity of the pump body 1 into the oil suction cavity 13 and the oil outlet cavity 14 by cooperating with the first internal gear 3 and the second internal gear 4. Part of the split sealing band 6 is arranged in an 8-shaped mode, and the narrowest part of the split sealing band 6 arranged in the 8-shaped mode is arranged opposite to the oil trapping cavity 15. The axial direction is perpendicular to the radial direction of the first internal gear 3 and the second internal gear 4. The unloading groove 7 is formed in the connection area of the oil suction cavity 13, the oil outlet cavity 14 and the split sealing band 6 in the radial direction and is arranged opposite to the oil trapping cavity 15, so as to form a fan-shaped area of the unloading groove 7. The unloading groove 7 communicates with the oil outlet cavity 14, the unloading groove 7 discharges the oil in the oil trapping cavity 15, so that the oil trapping cavity 15 changes from large to small; the unloading groove 7 communicates with the oil suction cavity 13, the unloading groove 7 fills the oil into the oil trapping cavity 15, so that the oil trapping cavity 15 changes from small to large.

[0046] It can be understood that, by arranging part of the split sealing band 6 in an 8-shaped mode and arranging the narrowest part of the split sealing band 6 arranged in the 8-shaped mode opposite to the oil trapping cavity 15, forming the unloading groove 7 in the connection area of the oil suction cavity 13, the oil outlet cavity 14 and the split sealing band 6 in the radial direction and arranging the unloading groove 7 opposite to the oil trapping cavity 15, so as to form a fan-shaped area of the unloading groove 7, the gear oil pump provided by the application can discharge the oil in the oil trapping cavity 15 through the unloading groove 7, so that the oil trapping cavity 15 changes from large to small, so as to avoid the gear movement resistance caused by the incompressibility of the oil and increase the power consumption. The unloading groove 7 fills the oil into the oil trapping cavity 15 through the oil suction cavity 13, so that the oil trapping cavity 15 changes from small to large. Thus, the oil trapping problem of the externally engaged gear pump in the prior art is solved, and the power consumption of the pump can be reduced under the same performance.

[0047] It should be noted that although several structures, components or units for implementing related functions are mentioned in the foregoing detailed description, the division is not mandatory. In fact, according to the specific implementation of the application, the features and functions of two or more structures, components or units described above can be embodied in one structure, component or unit. Conversely, the features and functions of one structure, component or unit described above can be further divided into multiple components, structures or units.

[0048] Moreover, although individual components of the application or assembly and the interrelationship of the components are described in a particular sequence in the drawings, it is not required that the components or assembly be assembled in that particular sequence, or that all of the components be present in order to achieve the desired result. Additional or alternative components, or omissions of components, can be used to accomplish the desired result.

[0049] Although the application has been disclosed in connection with the preferred embodiments shown, it should be understood that many modifications, substitutions, and changes can be made by those skilled in the art without departing from the spirit or scope of the application. Accordingly, the application is not intended to be limited by the recited claims but is intended to cover all those employing the principles and characteristics of the application.

Claims

1. A gear-type oil pump, comprising a pump body and an external gear disposed outside the pump body, and an oil suction chamber and an oil discharge chamber formed inside the pump body, characterized in that, Also includes: First internal gear, second internal gear, dividing sealing strip and unloading groove; The first internal gear is connected to the external gear via a gear shaft, so as to rotate under the drive of the external gear; the first internal gear and the second internal gear mesh externally, and an oil trapping cavity is formed at the meshing connection; The dividing sealing strip protrudes from the middle of the inner wall of the pump body and clamps the first internal gear and the second internal gear between the dividing sealing strip in the axial direction of the gear shaft, so as to cooperate with the first internal gear and the second internal gear to divide the inner cavity of the pump body into the oil suction chamber and the oil outlet chamber; part of the dividing sealing strip is arranged in a figure-eight shape, and the narrowest part of the figure-eight-shaped dividing sealing strip is positioned opposite the oil trapping chamber; the axial direction is perpendicular to the radial direction of the first internal gear and the second internal gear. The unloading groove is formed in the radial connection area between the oil suction chamber, the oil outlet chamber and the dividing sealing strip, and is disposed relative to the oil trapping chamber, so that the unloading groove forms a fan-shaped area; the unloading groove communicates with the oil outlet chamber, and the unloading groove discharges the oil from the oil trapping chamber, making the oil trapping chamber smaller; the unloading groove communicates with the oil suction chamber, and the unloading groove fills the oil trapping chamber with oil, making the oil trapping chamber larger.

2. The gear-type oil pump according to claim 1, characterized in that, The narrowest part of the dividing sealing strip has a U-shaped middle section along its wall relative to the oil suction chamber and the oil outlet chamber, respectively. The arc-shaped middle section of the U-shaped middle section extends to both sides of the wall in a quarter-circle arc. The middle section of the dividing sealing strip and the arc-shaped middle section extending to both sides of the wall are the walls of the unloading groove. The middle section wall and the arc-shaped middle section wall make the unloading groove form a fan-shaped area.

3. The gear-type oil pump according to claim 2, characterized in that, The unloading groove includes a first unloading groove and a second unloading groove. The first unloading groove is connected to the oil outlet chamber and discharges the oil from the trapped oil chamber, causing the trapped oil chamber to shrink. The second unloading groove is connected to the oil suction chamber and fills the trapped oil chamber with oil, causing the trapped oil chamber to expand. Correspondingly, the first unloading groove forms a first fan-shaped area, and the second unloading groove forms a second fan-shaped area.

4. The gear-type oil pump according to claim 2, characterized in that, The pump body has a first inner wall and a second inner wall that are disposed opposite to each other in the axial direction. The dividing sealing strip includes a first dividing sealing strip and a second dividing sealing strip. The first dividing sealing strip protrudes from the first inner wall, and the second dividing sealing strip protrudes from the second inner wall. The first dividing sealing strip and the second dividing sealing strip are opposite to each other in the axial direction. The first internal gear and the second internal gear are clamped in the first dividing sealing strip and the second dividing sealing strip.

5. The gear-type oil pump according to claim 4, characterized in that, The first and second segmented sealing strips each include an integrally formed connecting part, a segmenting part, and an extension part; The connecting part is located at the narrowest point of the dividing sealing strip; the wall of the connecting part is U-shaped relative to the oil suction chamber and the oil outlet chamber respectively; the wall of the connecting part is the middle wall of the U-shape; In the width direction of the pump body, the segment is located on both sides of the connecting part; the arc-shaped wall of the segment is a quarter circle relative to the oil suction chamber and the oil outlet chamber respectively; The extension portions extend from the segmented portion to the wall of the pump body.

6. The gear-type oil pump according to claim 5, characterized in that, It also includes shaft holes that pass through the first and second segmented sealing strips, and the shaft holes are respectively located in the segmented portions; the direction of the line connecting the shaft holes on the segmented portions is the width direction of the pump body.

7. The gear-type oil pump according to claim 5, characterized in that, It also includes cavitation grooves, which are recessed in the segmented sealing strip and located at the junction of the segment and the extension.

8. The gear-type oil pump according to claim 7, characterized in that, The cavitation groove is located at the junction of the first segmented sealing strip and / or the segmented portion and the extended portion of the first segmented sealing strip.

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