CN218829367U - Motor casing, motor and crescent gear pump of crescent gear pump - Google Patents

Abstract

The application discloses crescent gear pump's motor casing, motor and crescent gear pump. The motor shell comprises a hollow cylindrical structure, a shaft hole is formed in the bottom surface of the motor shell, a rotating shaft of the power supply machine penetrates out of the motor shell, a first sunken groove and a second sunken groove are formed in the area, surrounding the shaft hole, of the bottom surface of the motor shell, and the first sunken groove corresponds to an oil suction window of the internal gear pump and is used for forming an oil suction cavity of the internal gear pump; the second sunken groove corresponds to a pressure oil window of the internal gear pump and is used for forming a pressure oil cavity of the internal gear pump; on the bottom surface of motor shell, seted up a recess between first heavy groove and shaft hole, the recess is with first heavy groove and shaft hole intercommunication to make the fluid of oil absorption intracavity can flow in the shaft hole through the recess. The outer terminal surface of motor shell of this application embodiment is seted up flutedly, can introduce the shaft hole with the fluid in the fluid cavity, plays lubricated pivot and radiating effect.

Description

Motor shell of internal gear pump, motor and internal gear pump

Technical Field

The application relates to the technical field of motors, in particular to a motor shell of an internal gear pump, a motor and the internal gear pump.

Background

A motor, which is a power device capable of generating a driving torque, generally includes a stator, a rotor, and a casing accommodating the stator and the rotor. The pivot of rotor is connected with the action wheel in the crescent gear pump after wearing out through the shaft hole on the casing, and the pivot rotates for the shaft hole, and wherein need closely cooperate between shaft hole and the pivot, reach sealed requirement to prevent that outside fluid from getting into inside pollution stator of motor and rotor, and owing to the requirement to having the leakproofness between shaft hole and the pivot, the pivot produces a large amount of unnecessary heats and wearing and tearing for the rotation in shaft hole more easily, and long-time operation can influence the motor performance.

SUMMERY OF THE UTILITY MODEL

To the technical problem who exists among the prior art, this application embodiment provides a motor casing, motor and crescent gear pump of crescent gear pump, through set up the recess on the outer terminal surface at motor casing bottom surface, introduces the shaft hole department to the casing with a small amount of fluid, neither influences the leakproofness, can reach lubricated and radiating purpose again, is favorable to improving motor performance and life-span.

The embodiment of the application provides a motor shell of an internal gear pump, which comprises a hollow cylindrical structure, wherein a shaft hole is formed in the bottom surface of the motor shell, and a rotating shaft of a power supply machine penetrates out of the motor shell; the second sink groove corresponds to a pressure oil window of the internal gear pump and is used for forming a pressure oil cavity of the internal gear pump; on the bottom surface of motor shell, seted up a recess between first heavy groove and shaft hole, the recess is with first heavy groove and shaft hole intercommunication to make the fluid of oil absorption intracavity can flow in the shaft hole through the recess.

Optionally, under the condition that an oil seal is sleeved between the rotating shaft and the shaft hole, oil in the oil suction cavity flows to a position between the shaft hole and an inner ring of the oil seal through the groove.

Optionally, in the case that the outer circumferential edge of the shaft hole has a chamfer, the groove communicates the first sunken groove with the chamfer surface of the chamfer, so that the oil in the oil suction cavity flows between the shaft hole and the inner ring of the oil seal through the groove.

Optionally, the depth of the groove is less than or equal to the vertical height of the chamfer surface, or the bottom surface of the groove is higher than the bottom surface of the chamfer.

Optionally, in the case that the outer end surface of the shaft hole has a flange in the circumferential direction, the groove communicates the first sunken groove with the flange, so that the oil in the oil suction cavity flows between the shaft hole and the inner ring of the oil seal through the groove, wherein the flange is used for limiting the oil seal to move towards the outer side of the shaft hole.

Optionally, the first sinking groove and the second sinking groove are both arc-shaped grooves, wherein the first sinking groove comprises a first inner arc and a first outer arc, the circle centers of the first inner arc and the first outer arc are not coincident, and the arc length of the first inner arc is smaller than that of the first outer arc; the second sinking groove comprises a second inner arc and a second outer arc, the circle centers of the second inner arc and the second outer arc are not coincident, and the arc length of the second inner arc is smaller than that of the second outer arc; the centers of the first inner arc and the second inner arc are superposed, and the centers of the first outer arc and the second outer arc are superposed.

Optionally, the depth of the first sinking groove is 2-3 mm, the depth of the second sinking groove is 2-3 mm, and the depth of the oil return groove is 2.4-2.6 mm.

Optionally, an annular sealing groove is further formed in the bottom surface of the motor casing, a circle center of the annular sealing groove coincides with a circle center of the first outer arc, the first sinking groove and the second sinking groove are located in an area surrounded by the annular sealing groove, and the annular sealing groove has a preset width in the radial direction and is used for placing the sealing ring.

Optionally, the bottom surface of the motor casing is further provided with 4 mounting screw holes and 2 positioning pin holes, the mounting screw holes are used for fixedly mounting the motor casing on the pump body assembly, and the positioning pin holes are used for positioning the motor casing and the pump body assembly during mounting; the mounting screw holes and the positioning pin holes are distributed at intervals along the circumferential direction, and two mounting screw holes are formed between the two positioning pin holes; the pump body assembly comprises an inner-meshed driving wheel, a driven wheel and a pump shell buckled on the driving wheel and the driven wheel, an oil inlet and an oil outlet are formed in the pump shell, the oil inlet corresponds to an oil suction cavity of the oil pump, and the oil outlet corresponds to an oil pressing cavity of the oil pump.

The embodiment of the application also provides a motor of the crescent gear pump, and the shell of the motor of the crescent gear pump is the motor shell.

The embodiment of this application still provides a crescent gear pump, crescent gear pump's motor be the aforesaid the motor, the shaft hole of motor is connected with crescent gear pump's action wheel, the pivot mounting hole and the shaft hole of action wheel support tightly through the terminal surface.

The embodiment of this application sets up a recess on motor housing's outer terminal surface, the position of this recess is located between shaft hole and the fluid cavity, therefore can be with fluid drainage to shaft hole department in the fluid cavity of original confined, the existence of a small amount of fluid can play the lubrication action to the rotation of motor output shaft, reduce the part wearing and tearing, fluid and part contact can also take away partly heat, prevent that the part is overheated, can solve wearing and tearing and overheated problem that the pivot exists in the rotation process among all kinds of motors well.

Drawings

Preferred embodiments of the present application will now be described in further detail with reference to the accompanying drawings, in which:

fig. 1 is a schematic perspective view of a motor casing according to an embodiment of the present application;

FIG. 2 isbase:Sub>A cross-sectional view of the structure of FIG. 1 taken along A-A;

FIG. 3 is a schematic illustration of a portion of a crescent gear pump;

FIG. 4 is an enlarged view of the structure at B in the structure of FIG. 1;

fig. 5 is a schematic structural view of an axial hole of a motor casing according to an embodiment of the present application;

FIG. 6 is a view in the direction C of the structure of FIG. 1; and

fig. 7 is a sectional view of an oil pump motor according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the following detailed description, reference is made to the accompanying drawings that form a part hereof and in which is shown by way of illustration specific embodiments of the application. In the drawings, like numerals describe substantially similar components throughout the different views. Various specific embodiments of the present application are described in sufficient detail below to enable those skilled in the art to practice the teachings of the present application. It is to be understood that other embodiments may be utilized and structural, logical or electrical changes may be made to the embodiments of the present application.

In this document, terms such as first, second, third, and the like are used solely to distinguish one entity (or operation) from another entity (or operation), without necessarily requiring or implying any order or relationship between such entities (or operations).

The embodiment of the application provides a motor shell which comprises a hollow cylindrical structure, wherein a shaft hole is formed in the bottom surface of the motor shell, a rotating shaft of a power supply machine penetrates out of the motor shell, a first sunken groove and a second sunken groove are formed in an area, surrounding the shaft hole, in the bottom surface of the motor shell, and correspond to an oil suction window of an internal gear pump and are used for forming an oil suction cavity of the internal gear pump; the second sunken groove corresponds to a pressure oil window of the internal gear pump and is used for forming a pressure oil cavity of the internal gear pump; on the bottom surface of motor shell, seted up a recess between first heavy groove and shaft hole, the recess is with first heavy groove and shaft hole intercommunication to make the fluid of oil absorption intracavity can flow in the shaft hole through the recess. It can be seen that, according to the embodiment of the application, can set up a recess on the bottom surface of motor housing, the position of this recess is located between shaft hole and the first sunken groove, first sunken groove corresponds with crescent gear pump's oil absorption window, and form crescent gear pump's oil absorption chamber with crescent gear pump oil absorption window together, like this, fluid that fills in the first sunken groove can flow to shaft hole department through the recess, the existence of a small amount of fluid can play the lubrication action to the rotation of motor shaft (being motor output shaft), reduce the part wearing and tearing, thus fluid and part contact can also take away a part of heat, prevent the part overheated, can solve wearing and tearing and overheated problem that the pivot exists in the rotation process among all kinds of motors well.

Here, the groove formed on the bottom surface of the casing can play a role of guiding oil, so that the applicant of the present application refers to the groove as an "oil return groove", and a small amount of oil can flow into the oil return groove from the oil suction chamber corresponding to the first sinking groove and enter the shaft hole of the output shaft of the motor, thereby lubricating and dissipating heat from the shaft hole. In addition, the first sunken groove is communicated with the oil suction cavity of the internal gear pump, and the oil suction cavity is low relative to the oil pressure cavity in the internal gear pump, so that the groove is communicated with the first sunken groove and the shaft hole, high-pressure oil can be prevented from flowing into the oil return groove rapidly to impact the oil seal, and the oil quantity of the low-pressure oil flowing into the oil return groove is small, so that a small amount of oil permeates between the rotating shaft and the inner wall of the oil seal under the condition of ensuring the sealing performance of the oil seal on external oil, and the purposes of lubrication and heat dissipation are achieved. The design philosophy of recess promptly scavenge groove in this application embodiment is unique, the design is ingenious, realizes the degree of difficulty in the technology low, can play important role in the whole operation of motor, possesses spreading value.

In the following, a detailed description is given of various specific implementations of the groove, i.e., the oil returning groove in the embodiment of the present application, and it should be clear that the "groove" and the "oil returning groove" in this document all refer to the groove structure designed in the embodiment of the present application and located between the shaft hole of the motor casing and the first sinking groove.

In some embodiments of the present application, after the casing of the motor is assembled with the pump body assembly, the first sunken groove and the second sunken groove on the bottom surface of the casing of the motor and the oil suction window and the oil pressing window on the pump body assembly form an oil suction cavity and an oil pressing cavity, respectively. The pump body assembly is a part of an internal gear pump except a motor, and at least comprises a driving wheel meshed with a driven wheel and a pump shell provided with an oil suction port and an oil pressing port. The motor during operation, the output shaft drives crescent gear pump's owner and send the wheel and rotate from the driving wheel, and the oil absorption intracavity is full of fluid, correspondingly, also is full of fluid in the first heavy inslot, and the output shaft is rotatory for the shaft hole, and fluid in the first heavy inslot flows into the motor shaft downthehole through the recess of this application embodiment promptly oil gallery, and the output shaft and the shaft hole of pairing rotation play lubricated and radiating effect.

The cross section shape of the groove is not limited, oil in the oil chamber can be led into the shaft hole, and the cross section shape of the groove can be regular or irregular, such as square, U-shaped, V-shaped and the like.

In some embodiments, in order to prevent external oil from entering the interior of the motor through the shaft hole, the pressure of the oil in the oil chamber should not be too high, so that a small amount of oil in the oil chamber can enter the shaft hole. The fluid that gets into in the shaft hole can rotate the heat effluvium that produces with the pivot, can also play lubricated effect for the pivot is more steady high-efficient for the rotation in shaft hole.

In some embodiments, optionally, the outer circumferential edge of the shaft hole has a chamfer, and a first edge of the bottom surface of the groove is not lower than the chamfer surface of the chamfer, and the first edge is an edge on the bottom surface of the groove close to the shaft hole.

That is, a chamfer is machined on the outer circumferential edge of the shaft hole, and the oil return groove communicates the chamfer surface of the chamfer with the first sunken groove. The bottom edge of the oil return groove is designed on the chamfer surface, namely the bottom edge of the oil return groove is higher than the bottom surface of the chamfer (rather than lower than the bottom surface of the chamfer), because when other components are loaded into the shaft hole, the sharp edge of the oil return groove can be prevented from contacting with the loaded components and being scratched by the guiding action of the chamfer surface, and the damage to the existing components caused by the design of the oil return groove can be avoided. It can be seen that, under the condition of realizing fluid water conservancy diversion, in order to protect the part of installing in the axle hole, this application embodiment is injectd the position of the bottom edge border of oil gallery, has also been injectd the degree of depth of recess promptly, can obtain good result of use.

Further, in the field, in order to improve the sealing performance of the motor casing, an oil seal can be arranged between the shaft hole and the rotating shaft, so that the position relationship between the oil seal and the oil return groove needs to be considered; moreover, according to the structure of the shaft hole, the mounting mode of the oil seal can be divided into mounting from the outside of the machine shell (pressing into the shaft hole from the outside of the machine shell) and mounting from the inside of the machine shell (pressing into the shaft hole from the inner side of the machine shell), and the oil seal is usually made of rubber material, and is easy to scratch and damage if contacting with a sharp object in the mounting process, so that the sealing performance of the oil seal is influenced. In consideration of the characteristics of the oil seal, the embodiment of the application provides the following various ways to realize reasonable design of the oil return groove.

● In one mode

As an example, an oil seal is sleeved between the rotating shaft and the shaft hole, and the groove communicates the first sunken groove with the shaft hole, so that the oil liquid flows to the shaft hole through the groove and contacts with an inner ring of the oil seal.

Specifically, see that the cover is equipped with the oil blanket between pivot and the shaft hole, the outer wall and the shaft hole inner wall interference fit of oil blanket, do not take place relative rotation, the inner circle and the pivot cooperation of oil blanket, the pivot rotates for the oil blanket inner circle, takes place sliding friction between the two, can produce more heat at rotatory in-process, influences the sealing performance of oil blanket. The embodiment of the application utilizes a small amount of fluid in the oil return groove to be introduced between the rotating shaft and the inner ring of the oil seal, and the fluid can play the roles of heat dissipation and lubrication, so that the abrasion and the deformation of the oil seal are relieved, and the tightness of the oil seal is not influenced.

● Mode two

As an example, an oil seal is sleeved between the rotating shaft and the shaft hole, the oil seal is installed into the shaft hole from the inner side of the casing, and the outer end face of the shaft hole is provided with a flange which is used for limiting the oil seal to move towards the outer side of the shaft hole; the oil chamber is communicated with the flange through the groove, so that oil flows to the shaft hole through the groove and is in contact with the inner ring of the oil seal.

Specifically, the oil seal can be installed into the shaft hole from the inner side of the motor shell, the flange is located on the outer end face of the shaft hole, and the mounting position of the oil seal can be limited by the flange, so that the oil seal is prevented from moving to the outer portion of the motor shell along the shaft hole. Here, the oil return groove switches on the flange and the oil liquid cavity, and oil liquid in the oil liquid cavity enters the shaft hole, so that the oil liquid flows between the inner ring of the oil seal and the rotating shaft, and the functions of heat dissipation and lubrication are achieved.

In this embodiment, the oil seal is installed into the shaft hole from the inner side of the casing, and does not contact with the outer edge of the shaft hole, so the oil return groove formed on the outer edge of the shaft hole does not affect the installation of the oil seal. In addition, if the oil seal is installed from the inner side of the machine shell, and a chamfer is also machined on the outer edge of the flange for machining needs, in this case, the application does not limit the position relation between the groove and the chamfer surface, namely, whether the first edge of the groove is on the chamfer surface or not, as long as the groove can connect the first sunken groove and the flange, and the oil liquid in the first sunken groove is led into the shaft hole.

● Mode III

As an example, an oil seal is sleeved between the rotating shaft and the shaft hole, the oil seal is installed into the shaft hole from the outer side of the casing, the peripheral edge of the outer side of the shaft hole is machined to be provided with a chamfer, the chamfer is used for installing the oil seal into the shaft hole from the outer side of the casing, and the groove is used for communicating the oil cavity with the chamfer surface of the chamfer, so that oil flows to the shaft hole through the groove and is in contact with the inner ring of the oil seal.

Optionally, the depth of the groove is less than or equal to the vertical height of the chamfer surface, or the bottom surface of the groove is higher than the bottom surface of the chamfer.

Specifically, the oil seal can be installed into the shaft hole from the outer side of the motor shell, the peripheral edge of the outer side of the shaft hole is provided with a chamfer through machining, the chamfer has a guiding effect, the oil seal can be led into the shaft hole from the outer portion of the motor shell, the oil return groove communicates the oil liquid cavity with the chamfer surface of the chamfer, and oil liquid in the oil liquid cavity is led into the shaft hole. Here, because the oil return groove is used for communicating the oil cavity with the chamfer surface, the bottom edge of the oil return groove on the chamfer surface cannot be in contact with the outer ring of the oil seal when the oil seal is installed, the oil seal cannot be damaged, and the sealing performance of the oil seal cannot be influenced.

In some embodiments of the present application, the depth of the oil returning groove is specially designed, for example, the depth of the oil returning groove is less than or equal to the vertical height of the chamfer surface, or the bottom surface of the oil returning groove is higher than the bottom surface of the chamfer. Therefore, the edge of the bottom surface of the oil return groove is required to be always positioned on the chamfer surface and cannot be lower than the chamfer surface, and the bottom edge of the oil return groove can be ensured not to contact with the oil seal.

It can be seen that, in various embodiments of the present application, the structure of the shaft hole is adapted to the installation mode of the oil seal, and for different shaft hole structures and oil seal installation modes thereof, the setting position of the oil return groove and the groove depth requirements are different. According to the above-mentioned embodiment of this application, can realize the drainage function of oil gallery under the prerequisite that does not influence the original performance of oil blanket, reach for the radiating and lubricated purpose of casing.

In some embodiments, optionally, an annular sealing groove is further provided on an outer end surface of the bottom surface of the motor casing, the annular sealing groove surrounds the areas where the first sink groove and the second sink groove are located, and the annular sealing groove is used for isolating the surrounding area from an outer area when the casing is assembled with the pump body assembly so as to prevent oil from entering the surrounding area.

The annular sealing groove is surrounded to form a sealing area, when the motor shell is connected with the pump body assembly, the sealing ring can be arranged in the annular sealing mounting groove, and the space formed by buckling the pump body assembly and the outer end face of the bottom surface of the shell is isolated from the external area so as to prevent external oil from entering the space. During the operation of the internal gear pump, the motor can be immersed in oil, namely, the structure outside the ring-shaped sealing ring is arranged in the middle of the oil, so that the external oil can be isolated, the oil is prevented from entering the motor shell, and the motor is maintained to normally work.

In some embodiments, optionally, the outer end face of the bottom surface of the casing is further provided with 4 mounting screw holes and 2 positioning pin holes, and the mounting screw holes are used for mounting and fixing the motor casing and the pump body assembly. The positioning pin hole is used for positioning the motor shell and the pump body assembly during installation; wherein, installation screw and location pinhole along circumferencial direction interval ground distribution, have two installation screw between two location pinholes. Here, installation screw and pinhole interval set up, under the circumstances of guaranteeing motor housing and pump body subassembly installation fastening, can make the distribution of the stress on the motor housing more even.

The embodiment of the application also provides a motor of the internal gear pump, the internal gear pump and the gear box, and the shell of the motor of the internal gear pump is the motor shell. The oil pump motor that this application embodiment provided can introduce the inner circle of shaft hole inner oil blanket with the fluid in the low pressure oil chamber in the crescent gear pump when drive crescent gear pump for the pivot is more level and smooth and stable for the rotation of oil blanket, and, the fluid that gets into the oil blanket inner circle can also play radiating effect.

To more clearly illustrate the advantages that may be achieved by the embodiments of the present application, exemplary structures and implementations of the embodiments of the present application are described in detail below based on specific examples.

Fig. 1 schematically shows a perspective structure schematic diagram of a motor housing according to an embodiment of the present application, taking a housing of an oil pump motor as an example. Fig. 2 isbase:Sub>A cross-sectional view of the structure of fig. 1 taken alongbase:Sub>A-base:Sub>A. As shown in fig. 1 and 2, the motor casing 100 includes a casing side wall 101 and a bottom surface 102 of the motor casing, and the casing side wall 101 and the bottom surface 102 of the motor casing form a motor cavity 103 for accommodating the stator assembly and the rotor assembly. The bottom surface 102 of the motor casing is provided with a shaft hole 104 for the output end of the motor rotating shaft to penetrate out. When the motor works, the output end of the motor rotating shaft extends out of the shaft hole 104 and is connected with a driving wheel of the internal gear pump. A first sunken groove 107 and a second sunken groove 108 are formed in the area, surrounding the shaft hole 104, on the bottom surface 102 of the motor shell, and the first sunken groove 107 corresponds to an oil suction window of a crescent gear pump (not shown in the figure) and is used for forming an oil suction cavity of the crescent gear pump; the second sink 108 corresponds to a pumping window of the internal gear pump and is used for forming a pumping chamber of the internal gear pump. Specifically, the internal gear pump includes a motor and a pump body assembly, the motor housing is a motor housing 100, and the pump body assembly includes a driving wheel and a driven wheel which are engaged with each other and a pump housing provided with an oil suction port and an oil pressing port. Fig. 3 shows a schematic partial view of an internal gear pump in order to understand the structure of a part of the pump block assembly. As shown in fig. 1 and 3, the driving pulley 301 and the driven pulley 306 of the internal gear pump are engaged with each other to form a cylinder 307 having two end surfaces and a certain thickness, one end of the cylinder 307 is connected to the outer end surface 105 of the bottom surface of the casing, and the other end is engaged with the casing to form the internal gear pump. Since the outer end surface 105 of the bottom surface of the housing is connected to one end of a cylinder formed by the engagement of the driving wheel 301 and the driven wheel 306, the first sunken groove 107 provided on the outer end surface 105 can correspond to the oil suction window 304 formed by the driving wheel 301 and the driven wheel 306, and the second sunken groove 108 corresponds to the oil suction window 303 formed by the driving wheel 301 and the driven wheel 306. Viewed from the whole internal gear pump, an oil suction cavity in the internal gear pump is formed by a first sunken groove, an oil suction window and an oil suction port on a pump shell; similarly, the oil pressing cavity is formed by the second sink groove, the oil pressing window 303 and the oil pressing port on the pump shell. Furthermore, a groove 106 is formed in the bottom surface of the motor shell between the first sunken groove 107 and the shaft hole 104, and the groove 106 communicates the first sunken groove 107 with the shaft hole 104, so that oil in the oil suction cavity can flow into the shaft hole through the groove. Because the first sunken groove is one part of the oil suction cavity and the groove communicates the first sunken groove with the shaft hole, oil entering the oil suction cavity from the oil suction port can flow into the shaft hole through the groove. In addition, because the oil liquid in the oil suction cavity is low relative to the oil liquid in the oil pressing cavity, the pressure of the oil liquid flowing into the shaft hole from the first sunken groove is low, and the oil liquid cannot impact parts in the shaft hole, such as an oil seal, so that the sealing performance in the shaft hole is not influenced.

In the embodiments of the present application, the cross-sectional shape of the groove may be U-shaped, V-shaped, etc., and the specific shape of the cross-section of the groove is not limited in the present application, and it is within the scope of the present application as long as the oil in the first sink tank can be introduced into the shaft hole. In addition, through the mode of recess with first heavy groove and shaft hole intercommunication, can also reduce the processing cost under the condition that satisfies the user demand.

In some embodiments of the present application, optionally, an oil seal is disposed on the rotating shaft, and oil in the oil suction cavity flows between the rotating shaft and an inner ring of the oil seal through the groove, so as to perform the functions of lubrication and heat dissipation. In consideration of the structure of the oil seal and the shaft hole corresponding to the installation method thereof, the following restrictions are made, respectively.

In the first case, no matter whether the oil seal is installed from the inside or the outside, as long as the outer circumference of the shaft hole is provided with the chamfer surface, the first edge of the bottom edge of the groove is limited on the chamfer surface, so that no matter how the oil seal is installed, the position of the joint of the groove and the inner wall of the shaft hole cannot generate adverse effect on the oil seal. Fig. 4 is an enlarged view of the structure at B in the structure of fig. 1. As shown in FIG. 4, the outer circumferential edge of axial bore 104 has a chamfer 401, a first edge 403 of the bottom surface 402 of groove 106 is not lower than the chamfer of chamfer 401, and first edge 403 is the edge of the bottom surface 402 of groove 106 near the axial bore. Chamfer 401 is provided on the outside edge of shaft hole 104 for aesthetic or guiding purposes. The first edge 403 of the groove 106 is not lower than the chamfer surface of the chamfer 401, whether for aesthetic or guiding purposes.

With continued reference to fig. 1 and 2, the outer ring of the oil seal on the rotating shaft radially abuts against the oil seal mounting position 201 on the inner wall of the shaft hole 104, the outer ring and the oil seal mounting position are in interference fit and do not rotate, the inner ring of the oil seal and the rotating shaft generate sliding friction, and a small amount of oil can enter between the outer ring and the rotating shaft. Therefore, the oil in the oil chamber flows into the shaft hole through the groove 106 and can contact with the inner ring of the oil seal. The oil liquid flowing into the shaft hole can enter between the rotating shaft and the inner wall of the oil seal, and the lubricating and heat dissipating effects are achieved.

In the second case, referring to fig. 2, the oil seal is installed into the shaft hole 104 from the inside of the motor casing 100, and abuts against the inner wall of the oil seal installation position 201, and the flange 202 is a limiting structure of the oil seal and can limit the oil seal from moving to the outside of the casing along the axial direction of the shaft hole. The groove 106 communicates the flange 202 with the first sink groove 107 so that oil flows into the shaft bore 104 through the groove 106 into contact with the inner ring of the oil seal. In the case where the oil seal is fitted into the shaft hole 104 from the inside, the chamfered surface 401 may or may not be provided in the outer circumferential direction of the shaft hole 104. If the chamfer 401 is required to be machined for process requirements, the first edge of the groove 106 may or may not be on the chamfer, which is not limited, but the groove 106 must communicate the flange 202 with the first sink groove 107, so that the oil in the first sink groove can flow into the inner ring of the oil seal through the groove without affecting the sealing performance of the oil seal.

In the third case, the oil seal is installed into the shaft hole from the outside of the housing. Fig. 5 is a schematic structural view of an axial hole of a motor housing according to an embodiment of the present application. As shown in fig. 5, the oil seal installation position 201 is arranged at the entrance of the shaft hole 104, the oil seal enters the shaft hole from the outside, the limit structure of the oil seal is a limit flange 501, the outer edge of the shaft hole 104 is processed with a chamfer 401, and the chamfer 401 has a guiding function. Because the outer lane of oil blanket is interference fit with the inner wall of oil blanket installation position 201, so, the diameter of oil blanket will be greater than the diameter that the oil blanket installation position inner wall encloses the circle that establishes and form, need press the oil blanket into oil blanket installation position department in the shaft hole with the help of the elastic deformation of oil blanket during the installation. Because the entrance of shaft hole has seted up chamfer 401, the guide effect that utilizes chamfer 401 can be comparatively smooth installation oil blanket. The groove (not shown) connects the oil chamber with the chamfer surface of the chamfer 401, and introduces the oil in the oil chamber into the shaft hole 104. Since the oil seal is installed into the shaft hole 104 from the outside, the depth of the groove is less than or equal to the vertical height of the chamfer surface, or the bottom surface of the groove is higher than the bottom surface of the chamfer 401. Therefore, the depth of the groove is smaller than or equal to the vertical height of the chamfer surface, so that the outer ring of the oil seal can be prevented from being scratched and rubbed with the first edge of the groove when being installed, the oil seal is damaged, and the sealing performance of the oil seal is influenced. It should be noted that the specific parameters of the chamfer 401 provided when the oil seal is installed from the inside and the chamfer 401 provided when the oil seal is installed from the outside may not be the same.

In order to introduce the oil in the first sunken groove 107 into the inner ring of the oil seal through the groove 106 without affecting the sealing performance of the oil seal, the intersection of the groove 106 and the shaft hole 104, i.e. the first edge 403, must be located between the mounting position of the oil seal and the outer end surface of the housing, so that the oil flowing out of the groove can slowly permeate into the inner ring of the oil seal after flowing through the end surface of the oil seal, and the sealing performance of the oil seal is not affected. In addition, because the position of recess and shaft hole junction need be restricted, the distance between oil blanket installation position and the outer terminal surface of casing is limited, so can reduce the processing degree of difficulty through the mode drainage of recess, the manufacturing of being convenient for. Certainly, it also can the drainage to set up the through-hole between first heavy groove and shaft hole, but, the thickness that can be used to the wall of trompil between the thickness of considering first heavy groove and shaft hole and the first heavy groove is great and the degree of depth is less, and the processing cost can increase substantially with the degree of difficulty, so this application limits the drainage structure between first heavy groove and the shaft hole at the recess, like this, compares in other structures such as through-hole and can reduce the processing cost and process the high degree of difficulty, the batch production of being convenient for.

Fig. 6 is a view in the direction C of the structure of fig. 1. As shown in fig. 6, the first sinking groove 107 and the second sinking groove 108 are both arc-shaped grooves, wherein the first sinking groove 107 includes a first inner arc 1071 and a first outer arc 1072, the centers of the first inner arc 1071 and the first outer arc 1072 are not coincident, and the arc length of the first inner arc 1071 is smaller than that of the first outer arc 1071. The second sink groove 108 includes a second inner arc 1081 and a second outer arc 1082, the centers of the second inner arc 1081 and the second outer arc 1082 are not coincident, and the arc length of the second inner arc is smaller than that of the second outer arc. The centers of the first inner arc 1071 and the second inner arc 1081 coincide, and the centers of the first outer arc 1071 and the second outer arc 1082 coincide. In some embodiments of the present application, optionally, the depth of the first sinking groove is 2 to 3mm, the depth of the second sinking groove is 2 to 3mm, and the depth of the oil returning groove is 2.4 to 2.6mm.

As shown in fig. 6, an annular sealing groove 109 is further disposed on the bottom surface of the motor casing 100, a center of the annular sealing groove 109 coincides with a center of the first outer arc 1072, the first sunken groove 107 and the second sunken groove 108 are located in an area surrounded by the annular sealing groove, and the annular sealing groove 109 has a predetermined width along a radial direction for placing a sealing ring. In addition, the bottom surface of the motor shell is also provided with 4 mounting screw holes 601 and 2 positioning pin holes 602, the mounting screw holes 601 are used for fixedly mounting the motor shell on the pump body assembly, and the positioning pin holes 602 are used for positioning the motor shell and the pump body assembly during mounting. The mounting screw holes 601 and the positioning pin holes 602 are distributed at intervals along the circumferential direction, and two mounting screw holes are arranged between the two positioning pin holes. The pump body assembly comprises an inner-meshed driving wheel, a driven wheel and a pump shell buckled on the driving wheel and the driven wheel, an oil inlet and an oil outlet are formed in the pump shell, the oil inlet corresponds to an oil suction cavity of the oil pump, and the oil outlet corresponds to an oil pressing cavity of the oil pump.

Fig. 7 is a cross-sectional view of a motor of a crescent gear pump according to an embodiment of the present application. As shown in fig. 7, the motor 700 at least includes a motor casing 100, and a stator assembly 701 and a rotor assembly 706 disposed in the housing cavity of the motor casing. A rotating shaft 702 of the motor 701 penetrates out of the shaft hole 104, and an oil seal 702 is sleeved on the rotating shaft 703 and used for isolating an internal cavity of the motor from external oil. The groove 106 communicates the first sunken groove 107 with the shaft hole 104, oil sucked by an oil suction cavity of the internal gear pump is introduced into the shaft hole 104, and the oil is contacted with an inner ring of the oil seal 702 to play roles in lubrication and heat dissipation.

The embodiment of this application still provides a crescent gear pump, crescent gear pump's motor be the aforesaid the motor, the shaft hole of motor is connected with crescent gear pump's action wheel, the pivot mounting hole and the shaft hole of action wheel support tightly through the terminal surface.

The above-described embodiments are provided for illustrative purposes only and are not intended to limit the present disclosure, and those skilled in the art can make various changes and modifications without departing from the scope of the present disclosure, and therefore, all equivalent technical solutions should fall within the scope of the present disclosure.

Claims (11)

1. A motor shell of an internal gear pump is characterized in that the motor shell comprises a hollow cylindrical structure, a shaft hole is arranged on the bottom surface of the motor shell, a rotating shaft of a power supply machine penetrates out of the motor shell,

a first sunken groove and a second sunken groove are formed in the area, surrounding the shaft hole, on the bottom surface of the motor shell, and the first sunken groove corresponds to an oil suction window of the internal gear pump and is used for forming an oil suction cavity of the internal gear pump; the second sunken groove corresponds to a pressure oil window of the internal gear pump and is used for forming a pressure oil cavity of the internal gear pump;

the oil suction cavity is communicated with the shaft hole through the groove, so that oil in the oil suction cavity can flow into the shaft hole through the groove.

2. The motor casing of claim 1, wherein in a case where an oil seal is interposed between the rotating shaft and the shaft hole, oil in the oil suction chamber flows between the rotating shaft and an inner ring of the oil seal through the groove.

3. The motor casing according to claim 2, wherein in a case where an outer circumferential edge of the shaft hole has a chamfer, the groove communicates the first depressed groove with a chamfered surface of the chamfer, so that the oil in the oil suction chamber flows between the shaft hole and the inner ring of the oil seal through the groove.

4. The motor casing according to claim 3, wherein a depth of the groove is less than or equal to a vertical height of the chamfered surface, or a bottom surface of the groove is higher than the bottom surface of the chamfer.

5. The motor casing according to claim 2, wherein, in a case where a flange is circumferentially provided on an outer end surface of the shaft hole, the groove communicates the first sunken groove with the flange to allow the oil in the oil suction chamber to flow between the shaft hole and the inner ring of the oil seal through the groove, wherein the flange is configured to restrict the oil seal from moving to an outside of the shaft hole.

6. The motor housing of claim 1, wherein the first and second sink slots are each arc-shaped slots, wherein,

the first sinking groove comprises a first inner arc and a first outer arc, the circle centers of the first inner arc and the first outer arc are not coincident, and the arc length of the first inner arc is smaller than that of the first outer arc;

the second sinking groove comprises a second inner arc and a second outer arc, the circle centers of the second inner arc and the second outer arc are not coincident, and the arc length of the second inner arc is smaller than that of the second outer arc;

the circle centers of the first inner arc and the second inner arc are overlapped, and the circle centers of the first outer arc and the second outer arc are overlapped.

7. The motor case of claim 6, wherein the depth of the first sink groove is 2-3 mm, the depth of the second sink groove is 2-3 mm, and the depth of the oil return groove is 2.4-2.6 mm.

8. The motor casing of claim 6, wherein an annular sealing groove is further disposed on the bottom surface of the motor casing, a center of the annular sealing groove coincides with a center of the first outer arc, the first sink groove and the second sink groove are located in an area surrounded by the annular sealing groove, and the annular sealing groove has a predetermined width in a radial direction for placing a sealing ring.

9. The motor casing according to any one of claims 1 to 8, wherein 4 mounting screw holes and 2 positioning pin holes are further formed in the bottom surface of the motor casing, the mounting screw holes are used for mounting and fixing the motor casing and the pump body assembly, and the positioning pin holes are used for positioning the motor casing and the pump body assembly during mounting; the mounting screw holes and the positioning pin holes are distributed at intervals along the circumferential direction, and two mounting screw holes are formed between the two positioning pin holes; the pump body assembly comprises an inner-meshing driving wheel, a driven wheel and a pump shell buckled on the driving wheel and the driven wheel, an oil inlet and an oil outlet are formed in the pump shell, the oil inlet corresponds to an oil suction cavity of the oil pump, and the oil outlet corresponds to an oil pressing cavity of the oil pump.

10. A motor of a crescent gear pump, characterized in that the housing of the motor of a crescent gear pump is a motor housing according to any of claims 1-9.

11. A crescent gear pump, characterized in that, crescent gear pump's motor is claim 10 the motor, the shaft hole of motor with crescent gear pump's action wheel is connected, the pivot mounting hole of action wheel with the shaft hole supports tightly through the terminal surface.

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