CN218031352U

CN218031352U - Transmission oil pump

Info

Publication number: CN218031352U
Application number: CN202222232911.XU
Authority: CN
Inventors: 宋琳琳; 郭晓明; 王琪
Original assignee: FAW Jiefang Automotive Co Ltd
Current assignee: FAW Jiefang Automotive Co Ltd
Priority date: 2022-08-24
Filing date: 2022-08-24
Publication date: 2022-12-13
Anticipated expiration: 2032-08-24

Abstract

The utility model relates to a transmission oil pump technical field discloses a transmission oil pump, through setting up first low pressure arc recess and first high pressure arc recess on the pump body, and set up the oil feed passageway that communicates with first low pressure arc recess on the pump body; set up second low pressure arc recess and second high pressure arc recess simultaneously on the pump cover to set up the passageway of producing oil with the arc recess intercommunication of second high pressure on the pump cover, can make and be full of lubricating oil in low-pressure area and the high-pressure area all the time, guarantee that the oil feed of transmission oil pump is smooth and easy with producing oil, be difficult for blockking up. The pump body can be lightened by arranging the plurality of process grooves on the side surface of the pump body, which is opposite to the pump cover; the projections of the process groove, the first low-pressure arc-shaped groove and the first high-pressure arc-shaped groove on the plane perpendicular to the axial direction of the inner rotor are not overlapped completely, so that the thickness uniformity of the pump body along the axial direction of the inner rotor is improved, and shrinkage porosity is prevented from being formed in the machining process.

Description

Transmission oil pump

Technical Field

The utility model relates to a derailleur oil pump technical field especially relates to a derailleur oil pump.

Background

The transmission oil pump comprises a pump body and a pump cover, the pump cover and the pump body are connected to enclose a rotor cavity, an oil inlet and an oil outlet are formed in the pump cover, an inner rotor and an outer rotor are arranged in the rotor cavity, the inner rotor is driven to rotate through a rotating shaft, the inner rotor is used for driving the outer rotor to rotate, and lubricating oil at the oil inlet can be sucked when the inner rotor and the outer rotor are disengaged; as the inner and outer rotors continue to rotate, the inner and outer rotors are gradually engaged, and the lubricating oil is compressed and continuously extruded to the oil outlet.

However, the transmission oil pump has the problems of unsmooth suction and discharge of lubricating oil, and the lubricating oil entering the transmission oil pump is easy to seep through a high-pressure area, so that the transmission oil pump is blocked and rotates unsmoothly and the like.

In addition, the existing pump body has a large weight, and the requirement on the light weight of an oil pump is difficult to meet for a part of a transmission lubricating system; meanwhile, the pump body is thick in size, and shrinkage porosity and other defects are easily formed in the casting process of the pump body, so that the oil pump cannot work normally.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a transmission oil pump can simplify the structure of pump cover, reduces the processing cost of transmission oil pump, improves the lightweight degree of oil pump.

To achieve the purpose, the utility model adopts the following technical proposal:

the transmission oil pump comprises a pump shell, wherein the pump shell comprises a pump body and a pump cover, the pump body is connected with the pump cover to form a rotor cavity, an inner rotor and an outer rotor are arranged in the rotor cavity, and the inner rotor and the outer rotor are meshed to form a low-pressure area and a high-pressure area; the side surface of the pump body facing the pump cover is provided with a first low-pressure arc-shaped groove facing the low-pressure area and a first high-pressure arc-shaped groove facing the high-pressure area, and the pump body is provided with an oil inlet channel communicated with the first low-pressure arc-shaped groove;

the side surface of the pump cover facing the pump body is provided with a second low-pressure arc-shaped groove facing the low-pressure area and a second high-pressure arc-shaped groove facing the high-pressure area, and the pump cover is provided with an oil outlet channel communicated with the second high-pressure arc-shaped groove;

the side face, back to the pump cover, of the pump body is provided with a plurality of process grooves, and projections of the process grooves, the first low-pressure arc-shaped grooves and the first high-pressure arc-shaped grooves on a plane perpendicular to the axial direction of the inner rotor are completely not overlapped.

As an optimal technical scheme of the transmission oil pump, the pump body is provided with an oil conveying handle, and the oil inlet channel is arranged on the oil conveying handle.

As a preferable technical solution of the above transmission oil pump, the pump body and the oil delivery handle are integrally formed.

As a preferred technical solution of the above transmission oil pump, the transmission oil pump further includes a pump shaft, the pump shaft is connected to the inner rotor and is restricted to rotate circumferentially relative to the inner rotor, the pump shaft is rotatably connected to the pump housing, and one end of the pump shaft penetrates through the pump housing to form a connecting portion for connecting a power unit.

As a preferred technical scheme of the transmission oil pump, one side of the pump body, which is back to the pump cover, is provided with a plurality of installation bosses distributed at intervals in the circumferential direction, and the installation bosses are provided with installation through holes.

As a preferable technical scheme of the transmission oil pump, the pump body is detachably connected with the pump cover.

As a preferable technical solution of the above transmission oil pump, the pump body and the pump cover are connected by a plurality of fastening members distributed circumferentially.

As an optimal technical scheme of the transmission oil pump, the pump body is provided with a plurality of first bosses distributed at intervals in the circumferential direction, the pump cover is provided with a plurality of second bosses distributed at intervals in the circumferential direction, the first bosses and the second bosses are arranged opposite to each other one by one, and the first bosses and the second bosses are connected through the fasteners.

As a preferred technical solution of the above transmission oil pump, each mounting boss is provided with at least one first reinforcing rib, and two ends of the first reinforcing rib are respectively connected to the mounting boss and the outer wall of the pump body;

and/or each second boss is provided with at least one second reinforcing rib, and the two ends of each second reinforcing rib are respectively connected with the second boss and the outer wall of the pump cover.

As a preferred technical solution of the above transmission oil pump, a first sealing ring is arranged on one side of the pump body, which is opposite to the pump cover, and is used for installing a first sealing element;

and/or a second sealing element is arranged between the pump body and the pump cover in a sealing manner;

and/or an oil inlet is formed at one end of the oil inlet channel, and a third sealing ring is arranged on the opening end surface of the oil inlet and used for mounting a third sealing element.

The utility model discloses beneficial effect: when the transmission oil pump works, the inner rotor drives the outer rotor to rotate, the inner rotor and the outer rotor are disengaged in the low-pressure area, the low-pressure area forms vacuum, lubricating oil in the oil inlet channel is sucked into the low-pressure area through the first low-pressure arc-shaped groove, and meanwhile the lubricating oil in the low-pressure area can enter the second low-pressure arc-shaped groove; along with inner rotor and outer rotor continue to rotate, at high-pressure region meshing gradually of inner rotor and outer rotor, high-pressure region is compressed, and lubricating oil gets into second high-pressure arc recess and first high-pressure arc recess after being pressurized, and the lubricating oil of second high-pressure arc recess discharges through going out oil passage.

The pump body is provided with a first low-pressure arc-shaped groove and a first high-pressure arc-shaped groove, and the pump body is provided with an oil inlet channel communicated with the first low-pressure arc-shaped groove; set up second low pressure arc recess and second high pressure arc recess simultaneously on the pump cover to set up the passageway of producing oil with second high pressure arc recess intercommunication on the pump cover, can make and be full of lubricating oil in low-pressure region and the high-pressure region all the time, guarantee that the oil feed of derailleur oil pump is smooth and easy with producing oil, be difficult for blockking up.

The pump body can be lightened by arranging the plurality of process grooves on the side surface of the pump body, which is opposite to the pump cover; the projections of the process groove, the first low-pressure arc-shaped groove and the first high-pressure arc-shaped groove on the plane perpendicular to the axial direction of the inner rotor are completely not overlapped, so that the thickness uniformity of the pump body along the axial direction of the inner rotor is improved, and shrinkage porosity is prevented from being formed in the machining process.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

FIG. 1 is a cross-sectional view of a transmission oil pump provided in an embodiment of the present invention;

fig. 2 is a first side view of a pump casing provided by an embodiment of the present invention;

fig. 3 is a second side view of a pump casing according to an embodiment of the present invention;

FIG. 4 is a first side view of a pump cap according to an embodiment of the present invention;

fig. 5 is a second side view of a pump cover according to an embodiment of the present invention.

In the figure:

1. a pump body; 10. an oil delivery handle; 111. a first oil passage; 112. a second oil passage; 113. an oil inlet; 12. a process groove; 13. a first low pressure arcuate groove; 14. a first high pressure arcuate groove; 15. a first reinforcing rib; 16. perforating holes; 17. mounting a boss; 18. a first boss; 19. positioning holes; 101. a lubricating oil groove;

2. a pump cover; 21. a second low-pressure arc-shaped groove; 22. a second high-pressure arc-shaped groove; 23. an oil outlet channel; 24. a second reinforcing rib; 25. a second boss; 26. positioning the boss;

31. a first seal member; 32. a second seal member; 33. a third seal member;

4. plugging;

5. a pump shaft;

6. an outer rotor; 7. an inner rotor; 8. a fastener.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1 to 5, the present embodiment provides a transmission oil pump for lubricating oil supplied to a transmission. The transmission oil pump comprises a pump shell, wherein the pump shell comprises a pump body 1 and a pump cover 2, the pump body 1 is connected with the pump cover 2 to form a rotor cavity, an inner rotor 7 and an outer rotor 6 are arranged in the rotor cavity, and the inner rotor 7 and the outer rotor 6 are meshed to form a low-pressure area and a high-pressure area; the side surface of the pump body 1 facing the pump cover 2 is provided with a first low-pressure arc-shaped groove 13 facing the low-pressure area and a first high-pressure arc-shaped groove 14 facing the high-pressure area, and the pump body 1 is provided with an oil inlet channel communicated with the first low-pressure arc-shaped groove 13; the side surface of the pump cover 2 facing the pump body 1 is provided with a second low-pressure arc-shaped groove 21 facing the low-pressure area and a second high-pressure arc-shaped groove 22 facing the high-pressure area, and the pump cover 2 is provided with an oil outlet channel 23 communicated with the second high-pressure arc-shaped groove 22.

When the oil pump of the transmission works, the inner rotor 7 drives the outer rotor 6 to rotate, the inner rotor 7 and the outer rotor 6 are disengaged in a low-pressure area, the low-pressure area forms vacuum, lubricating oil in the oil inlet channel is sucked into the low-pressure area through the first low-pressure arc-shaped groove 13, and meanwhile the lubricating oil in the low-pressure area can enter the second low-pressure arc-shaped groove 21; as the inner rotor 7 and the outer rotor 6 continue to rotate, the inner rotor 7 and the outer rotor 6 are gradually meshed in a high-pressure area, the high-pressure area is compressed, lubricating oil enters the second high-pressure arc-shaped groove 22 and the first high-pressure arc-shaped groove 14 after being pressurized, and the lubricating oil in the second high-pressure arc-shaped groove 22 is discharged through the oil outlet channel 23.

The pump body 1 is provided with a first low-pressure arc-shaped groove 13 and a first high-pressure arc-shaped groove 14, and the pump body 1 is provided with an oil inlet channel communicated with the first low-pressure arc-shaped groove 13; set up second low pressure arc recess 21 and second high pressure arc recess 22 simultaneously on pump cover 2 to set up the passageway 23 that produces oil that communicates with second high pressure arc recess 22 on pump cover 2, can make and be full of lubricating oil in low-pressure region and the high-pressure region all the time, guarantee that the oil feed of derailleur oil pump is smooth and easy with producing oil, be difficult for blockking up.

Further, the pump body 1 is provided with an oil delivery handle 10, and the oil inlet channel is arranged on the oil delivery handle 10. Specifically, the pump body 1 is provided with a first oil channel 111 and a second oil channel 112 which are sequentially communicated, wherein one end of the second oil channel 112 is communicated with one end of the first oil channel 111, the other end of the second oil channel is communicated with the low-pressure area, the other end of the first oil channel 111 is provided with an oil inlet 113, the axial direction of the oil inlet 113 extends along the axial direction of the inner rotor 7, the first oil channel 111 extends along the radial direction of the inner rotor 7, and the second oil channel 112 is parallel and extends along the axial direction of the inner rotor 7. For convenience of processing, one end of the second oil passage 112 extends to the outer wall of the pump body 1 to form an opening, and the opening of the second oil passage 112 is provided with a plug 4 to prevent lubricating oil in the second oil passage 112 from leaking through the opening.

Further, the pump body 1 and the oil delivery handle 10 are integrally formed, so that the processing is convenient, and the processing cost is low.

Further, the transmission oil pump also comprises a pump shaft 5, the pump shaft 5 is connected with the inner rotor 7 and limited to rotate circumferentially relative to the inner rotor 7, the pump shaft 5 is rotatably connected with a pump shell, and one end of the pump shaft 5 penetrates out of the pump shell to form a connecting part for being connected with a power unit. The inner rotor 7 is driven by the power unit to drive the outer rotor 6 to rotate. In this embodiment, the pump shaft 5 penetrates the pump body 1, the connecting portion is located on a side of the pump body 1 opposite to the pump cover 2, and the power unit is a motor.

In order to improve the smoothness of the rotation of the pump shaft 5 relative to the pump body 1, a bearing is provided between the pump shaft 5 and the pump body 1. Specifically, the pump body 1 is provided with a through hole 16 for passing the pump shaft 5 therethrough, and the bearing is disposed between an inner peripheral wall of the through hole 16 and an outer peripheral wall of the pump shaft 5.

Furthermore, one side of the pump body 1, which is back to the pump cover 2, is provided with a plurality of installation bosses 17 which are circumferentially distributed at intervals, installation through holes are formed in the installation bosses 17, and the pump body 1 is installed on the shell of the power unit by fasteners such as bolts penetrating through the installation through holes.

One side of the pump body 1, which is opposite to the pump cover 2, is provided with a first sealing groove for installing a first sealing element 31. Specifically, an installation portion is formed at one end of the pump body 1, the installation portion is of an annular structure, a first sealing groove is formed in the outer peripheral wall of the installation portion, an installation hole is formed in a casing of the power unit, the installation portion is inserted into the installation hole, and a first sealing element 31 is arranged between the inner peripheral wall of the installation hole and the outer peripheral wall of the installation portion in a sealing mode, so that oil leakage can be prevented. When the pump body 1 and the housing of the power unit are connected, the connection position of the pump body 1 and the housing of the power unit may be sealed by the first seal member 31 to prevent oil leakage. Illustratively, the first seal 31 is an O-ring seal.

Further, the side of the pump body 1 opposite to the pump cover 2 is provided with a plurality of process grooves 12. Through setting up technology recess 12, can subtract heavy to the pump body 1, can set up technology recess 12 in the region that the pump body 1 thickness is thicker according to the structure of the pump body 1 to improve the pump body 1 along the axial thickness homogeneity of pump shaft 5, realize the lightweight of the pump body 1. Preferably, the projections of the process groove 12, the first low-pressure arc-shaped groove 13 and the first high-pressure arc-shaped groove 14 on a plane perpendicular to the axial direction of the inner rotor 7 are not overlapped completely, which is beneficial to improving the thickness uniformity of the pump body 1 along the axial direction of the inner rotor 7 and preventing shrinkage porosity from being formed in the processing process.

Further, the pump body 1 and the pump cover 2 are detachably connected. Because the oil circuit overall arrangement on the derailleur of different grade type is different, can select the pump cover 2 that is provided with oil outlet channel 23 according to the demand to satisfy the oil circuit overall arrangement demand of the derailleur of different grade type, improve the commonality of derailleur oil pump. In this embodiment, the pump body 1 and the pump cover 2 are connected by a plurality of circumferentially distributed fasteners 8, such as bolts.

Specifically, a plurality of first bosses 18 distributed at intervals in the circumferential direction are arranged on the pump body 1, a plurality of second bosses 25 distributed at intervals in the circumferential direction are arranged on the pump cover 2, the first bosses 18 and the second bosses 25 are arranged in a one-to-one opposite mode, and the first bosses 18 are connected with the second bosses 25 through bolts.

Optionally, one of two opposite end surfaces of the pump body 1 and the pump cover 2 is provided with a positioning hole 19, the other end surface is provided with a positioning boss 26, and the positioning hole 19 is inserted into the positioning boss 26. With the arrangement, when the pump body 1 and the pump cover 2 are installed, the positioning holes 19 and the positioning bosses 26 can be inserted for positioning. Illustratively, the end surface of the pump body 1 facing the pump cover 2 is provided with a positioning hole 19, and the end surface of the pump cover 2 facing the pump body 1 is provided with a positioning boss 26.

Optionally, each first boss 18 is provided with at least one first reinforcing rib 15, and two ends of each first reinforcing rib 15 are respectively connected with the first boss 18 and the outer wall of the pump body 1, so that the structural strength of the pump body 1 can be improved.

Optionally, each second boss 25 is provided with at least one second reinforcing rib 24, and the two ends of the second reinforcing rib 24 are respectively connected with the second bosses 25 and the outer wall of the end cover, so that the structural strength of the pump cover 2 can be improved.

Further, a second sealing member 32 is sealingly provided between the pump body 1 and the pump cover 2, so that the lubricant in the pump housing can be prevented from leaking through the contact surface between the pump body 1 and the pump cover 2. Illustratively, the end face of the pump body 1 facing the pump cover 2 is provided with a second sealing groove, the second sealing element 32 is provided in the second sealing groove, and the second sealing element 32 is an O-ring. In other embodiments, a second seal groove may be further disposed on the end surface of the pump cover 2 facing the pump body 1.

Further, one end of the oil inlet passage forms an oil inlet 113, and an open end surface of the oil inlet 113 is provided with a third seal 33. So set up, can with the terminal surface butt of oil inlet 113 and oil supply pipe to locate the third sealing member 33 clamp between the opening terminal surface of oil inlet 113 and the outer wall of oil tank, prevent that oil leak problem from appearing in oil inlet 113. Exemplarily, a third sealing groove is formed in an opening end face of the oil inlet 113, and a third sealing element 33 is arranged in the third sealing groove; the third seal 33 is an O-ring seal.

Alternatively, one end of the oil delivery shank 10 is provided with an assembling through-hole for mounting the oil delivery shank 10 to an oil supply pipe or the like by means of a bolt. So set up, can improve the stability of transmission oil pump.

Further, a lubricating oil groove 101 is formed in the side wall, facing the pump cover 2, of the pump body 1, one end of the lubricating oil groove 101 is communicated with the first low-pressure arc-shaped groove 13, and the other end of the lubricating oil groove is communicated with the through hole 16. The lubricating oil in the first low-pressure arc-shaped groove 13 can be guided to the through hole 16 through the lubricating oil groove 101 to lubricate the pump shaft 5.

In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied thereto. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious modifications, rearrangements and substitutions without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. The transmission oil pump comprises a pump shell, wherein the pump shell comprises a pump body (1) and a pump cover (2), the pump body (1) and the pump cover (2) are connected to form a rotor cavity, an inner rotor (7) and an outer rotor (6) are arranged in the rotor cavity, and the inner rotor (7) and the outer rotor (6) are meshed to form a low-pressure region and a high-pressure region; the pump is characterized in that a first low-pressure arc-shaped groove (13) facing the low-pressure area and a first high-pressure arc-shaped groove (14) facing the high-pressure area are formed in the side face, facing the pump cover (2), of the pump body (1), and an oil inlet channel communicated with the first low-pressure arc-shaped groove (13) is formed in the pump body (1);

a second low-pressure arc-shaped groove (21) which is over against the low-pressure area and a second high-pressure arc-shaped groove (22) which is over against the high-pressure area are formed in the side face, facing the pump body (1), of the pump cover (2), and an oil outlet channel (23) which is communicated with the second high-pressure arc-shaped groove (22) is formed in the pump cover (2);

the pump body (1) is equipped with a plurality of technology recesses (12) in the side that faces away from pump cover (2), technology recess (12), first low pressure arc recess (13) and first high pressure arc recess (14) are in the perpendicular to the projection on the axial plane of inner rotor (7) does not coincide completely.

2. The transmission oil pump according to claim 1, characterized in that the pump body (1) is provided with an oil delivery stem (10), the oil inlet passage being provided in the oil delivery stem (10).

3. The transmission oil pump according to claim 2, characterized in that the pump body (1) is integrally formed with the oil feed stem (10).

4. The transmission oil pump of claim 1, further comprising a pump shaft (5), wherein the pump shaft (5) is connected to the inner rotor (7) and is constrained from rotating circumferentially relative to the inner rotor (7), wherein the pump shaft (5) is rotationally connected to the pump housing, and wherein one end of the pump shaft (5) extends out of the pump housing to form a connection portion for connecting to a power unit.

5. The transmission oil pump according to claim 1, characterized in that a plurality of circumferentially spaced mounting bosses (17) are provided on a side of the pump body (1) facing away from the pump cover (2), and mounting through holes are provided on the mounting bosses (17).

6. The transmission oil pump according to claim 5, characterized in that the pump body (1) and the pump cover (2) are detachably connected.

7. The transmission oil pump according to claim 6, characterized in that the pump body (1) and the pump cover (2) are connected by means of a plurality of circumferentially distributed fasteners (8).

8. The transmission oil pump according to claim 7, characterized in that a plurality of circumferentially spaced first bosses (18) are provided on the pump body (1), a plurality of circumferentially spaced second bosses (25) are provided on the pump cover (2), the first bosses (18) and the second bosses (25) are arranged opposite to each other, and the first bosses (18) and the second bosses (25) are connected by the fastening members (8).

9. The transmission oil pump according to claim 8, characterized in that each mounting boss (17) is provided with at least one first reinforcing rib (15), and both ends of the first reinforcing rib (15) are respectively connected with the mounting boss (17) and the outer wall of the pump body (1);

and/or each second boss (25) is provided with at least one second reinforcing rib (24), and the two ends of the second reinforcing rib (24) are respectively connected with the second bosses (25) and the outer wall of the pump cover (2).

10. The transmission oil pump according to one of claims 1 to 9, characterized in that the side of the pump body (1) facing away from the pump cover (2) is provided with a first sealing ring for mounting a first seal (31);

and/or a second sealing element (32) is arranged between the pump body (1) and the pump cover (2) in a sealing manner;

and/or an oil inlet (113) is formed at one end of the oil inlet channel, and a third sealing ring is arranged on the opening end surface of the oil inlet (113) and used for mounting a third sealing element (33).