Crankcase motor assembly

Abstract

The utility model discloses a crankcase motor assembly, which comprises an external shell, a motor assembly and a filter element assembly, the motor assembly and the filter element assembly are fixed in the external shell, the motor assembly comprises a shell, a stator part and a rotor part, the stator part and the rotor part are mounted in the shell, and a separator for accommodating the rotor part is formed on the stator part in an injection molding manner. One end of the separator is opened along the axial direction, the other end of the separator is sealed, and a sealing piece is arranged between the opened end and the casing so as to fully seal the rotor piece. According to the utility model, oil gas is prevented from polluting the stator piece, the structural strength of the rotor protection sleeve is ensured, the air gap between the stator and the rotor is reduced, and a series of problems caused by overlarge air gap between the stator and the rotor are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of crankcase, especially relates to a crankcase motor assembly. BACKGROUND

[0002] At present, in order to avoid oil gas pollution stator, reduce the rust of stator core, the prior art CN115694027A discloses a kind of motor assembly of oil gas separator, as shown in Figure 8 And Figure 9 The motor stator assembly 100 includes motor stator shell 110 and rear cover 120, which are buckled to each other to form a stator cavity, and the stator cavity is provided with: a stator framework assembly 130, a stator winding 140 disposed on the stator framework assembly 130, a stator core 150 disposed on the stator framework assembly 130, and a PCBA board 160 electrically connected to the stator winding 140. The motor stator shell 110 includes a peripheral wall 111, an inner wall 112 and an annular bottom wall 113, the peripheral wall 111, the inner wall 112 and the annular bottom wall 113 form a "inverted concave" annular chamber for installing the stator framework assembly 130, the inner wall 120 forms an inner concave space for embedding the motor rotor assembly, so that the stator winding 140 and the rotor in the motor rotor assembly are coaxially arranged and are spaced on the inner and outer sides of the wall surface of the inner wall 112. In this way, the stator assembly and the rotor assembly are separated by the inner wall 112, as shown in Figure 9 The inner wall 112 is part of the motor stator shell 110 and is fixedly connected to the annular bottom wall 113, and the inner wall 112 here acts as a rotor protection sleeve, so in order to ensure the strength of the inner wall 112, the wall thickness of the inner wall 112 must be increased, usually between 0.5-1mm, which increases the air gap between the stator and the rotor. A large air gap can cause the following problems:

[0003] 1. Large heat generation: a large air gap causes the magnetic field inside the motor to be unstable, causing the motor to generate more heat;

[0004] 2. Power reduction: a large air gap reduces the output power of the motor;

[0005] 3. Increased noise: when the air gap is too large or unstable, the rotor will deviate irregularly and collide with the stator, causing noise;

[0006] 4. Shortened life: a large or unstable air gap can cause uneven stress on the internal structure of the motor, shortening the life of the motor. INVENTION CONTENTS

[0007] The utility model provides a kind of crankcase motor assembly, can avoid oil gas pollution stator piece, and guarantee the strength of rotor protective sleeve structure while reducing the air gap between stator and rotor, avoid a series of problems caused by the air gap between stator and rotor.

[0008] The utility model discloses the following technical scheme realizes:

[0009] A kind of crankcase motor assembly, including external shell and fixed in the motor assembly and filter core component of the external shell, the motor assembly includes shell and the stator piece and rotor piece installed in the shell, the stator piece is injection molded with the partition piece of containing the rotor piece, the partition piece is open along axial one end, the other end is sealed, and the end of opening is provided with sealing element between shell, to fully seal the rotor piece.

[0010] Further, the periphery of the stator piece is wrapped with a stator support, and a rotor protective sleeve is spacedly sleeved on the outer circumferential surface of the rotor piece.

[0011] Further, the stator support and the rotor protective sleeve are both made of plastic material, and the stator support and the rotor protective sleeve are integrally injection molded.

[0012] Further, the stator support is made of plastic material, and the rotor protective sleeve is made of ceramic material.

[0013] Further, the stator support, the sealing element, and the rotor protective sleeve form a sealed cavity together with the shell, and the rotor piece is installed in the sealed cavity.

[0014] Further, the axial section of the partition piece is in inverted U shape, the partition piece has a groove collinear with the axis, and the sealing element is arranged between the shell and the side of the partition piece close to the notch of the groove.

[0015] Further, the minimum radial distance between the stator piece and the rotor piece is 1-1.5 mm.

[0016] Further, the inner wall of the stator support and the rotor protective sleeve are integrally formed, and the wall thickness in the radial direction is 0.3-0.5 mm.

[0017] Further, it further includes a circuit board, the circuit board is fixed inside the shell, and the circuit board is located on the side of the stator piece away from the filter core component.

[0018] Further, the shell comprises a body part and a cover part, and an installation cavity for installing the circuit board is formed between the body part and the cover part.

[0019] Further, a boss is formed on a side of the body part facing the circuit board, and the circuit board is fixed on the boss.

[0020] Further, an installation plate is arranged between the circuit board and the boss, and the installation plate is made of aluminum.

[0021] Further, a bearing chamber is formed on a side of the shell close to a slot of the groove, and a sealing bearing is fixed in the bearing chamber, and the sealing bearing is used for supporting a rotating shaft on the rotor.

[0022] Further, a plurality of fixing plates are integrally formed on a peripheral wall of the stator support, and the fixing plates are fixed on the shell through locking screws.

[0023] Further, an installation groove is formed on an inner wall of the shell corresponding to the positions of the fixing plates, the installation groove extends along an axial direction of the shell, and the plurality of fixing plates are correspondingly fixed in the installation groove.

[0024] Further, positioning grooves are formed on two sides of at least one of the fixing plates, and positioning blocks corresponding to the positioning grooves are protruded on a side wall of the installation groove.

[0025] Further, a maximum outer diameter of a stator core in the stator is smaller than a maximum outer diameter of the stator support, and a minimum inner diameter of the stator core is smaller than a minimum inner diameter of the stator support.

[0026] Further, the stator core is at least partially exposed to a radial outer side of the stator support.

[0027] Further, an avoiding groove is recessed in the peripheral wall of the stator support, and a part of the stator core exposed to the radial outer side of the stator support is accommodated in the avoiding groove.

[0028] Compared with the prior art, the utility model has the advantages that:

[0029] 1. The stator is fully sealed by the rotor and the sealing element arranged between the opening end of the stator and the shell, so that the stator is not disturbed by oil gas, and the stator is made of injection molding process, so that the injection molding structure is simple, the process is simple, the assembly is convenient, the air tightness is good, and the strength is sufficient.

[0030] 2, The outer periphery of the stator member is wrapped with a stator support, and the outer circumferential surface of the rotor member is spaced apart and wrapped with a rotor protective sleeve, and the above-mentioned partition member is jointly formed by the stator support and the rotor protective sleeve. In one way, the stator support and the rotor protective sleeve are both made of plastic material, and the stator support and the rotor protective sleeve are integrally injection molded. In another way, the stator support is made of plastic material, and the rotor protective sleeve is made of ceramic material, and the stator support is wrapped around the rotor protective sleeve by injection molding. Since the structure of the stator member is relatively stable, it is ensured that the structure strength of the stator support wrapped around the outer periphery of the stator member and integrally injection molded is high enough, and the rotor protective sleeve is fixed on the inner circumferential wall of the stator support in an integral molding manner, so there is no need to consider the thickness of the rotor protective sleeve, and the strength can be directly guaranteed. Therefore, the rotor protective sleeve in the embodiment does not need to increase the wall thickness to improve the structural strength of the rotor protective sleeve. Compared with the prior art, the rotor protective sleeve in the embodiment is thinner, thereby greatly reducing the air gap distance between the stator member and the rotor member. After the air gap is reduced, the heat generated inside the motor is small, the magnetic field is more stable, the output power of the motor is improved, the movement stability between the stator member and the rotor member is high, the amount of deflection is small, thereby reducing noise and prolonging the service life of the motor. In addition, the proportion of the motor installation space can be reduced, thereby providing more installation space for other parts, reducing the volume between the rotor and the stator, and achieving cost reduction and efficiency improvement. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a structure schematic diagram of the crankcase motor assembly;

[0032] Figure 2 It is a sectional view of the crankcase motor assembly;

[0033] Figure 3 It is a sectional view of the motor assembly;

[0034] Figure 4 It is a structure schematic diagram of the stator support Figure 1 ;

[0035] Figure 5 It is a partial structure schematic diagram of the motor assembly

[0036] Figure 6 It is a structure schematic diagram of the stator support Figure 2 ;

[0037] Figure 7 It is a partial structure schematic diagram of the motor assembly;

[0038] Figure 8 It is an explosion diagram of the motor stator assembly in the motor assembly in the prior art;

[0039] Figure 9 It is a sectional view of the stator shell in the motor stator assembly in the prior art.

[0040] 1, external shell; 2, motor assembly; 20, machine shell; 200, body part; 201, cover part; 202, installation cavity; 203, boss; 204, bearing chamber; 205, installation slot; 206, positioning block; 21, stator part; 210, stator core; 22, rotor part; 220, rotating shaft; 23, rotor protection sleeve; 24, stator support; 240, recess; 241, notch; 242, fixed plate; 245, positioning slot; 243, locking screw; 246, avoiding slot; 25, sealing part; 26, sealing cavity; 27, circuit board; 28, installation plate; 29, sealing bearing; 3, filter core assembly. DETAILED DESCRIPTION

[0041] The utility model technical scheme will be further described in detail below in combination with the preferred embodiments and the drawings. In the description of the utility model, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientations or positional relationships shown in the drawings. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited. The embodiments described below by referring to the drawings are exemplary and are intended to explain the utility model, and cannot be understood as limiting the utility model.

[0042] As Figures 1-7 shown, the utility model embodiment of a kind of crankcase motor assembly, including external shell 1 and fixed in external shell 1 motor assembly 2 and filter core assembly 3, motor assembly 2 includes machine shell 20 and the stator part 21 and rotor part 22 of installation in machine shell 20, stator part 21 injection molding has the partition of accommodating rotor part 22, partition is opened along axial one end, the other end is sealed, the end of opening is provided with sealing part 25 between machine shell, to fully seal rotor part 22, separate oil gas between stator and rotor by injection molding partition on stator part 21, increase the reliability inside stator part 23, guarantee stator part is not polluted by oil gas.

[0043] As Figure 3 and Figure 4As shown, the axial section of the partition piece is in inverted U shape, and the injection and demolding processes are simple. The partition piece has a groove 240 in line with the axis, and a seal 25 is arranged between the partition piece and the casing 20 on the side close to the notch 241 of the groove 240, and the rotor piece 22 is accommodated in the groove 240 and is in clearance fit with the inner surrounding wall forming the groove 240, so as to separate the rotor piece 24 and the stator piece 21 in oil gas. In one mode, the seal is a sealing strip arranged in annular shape to be in profile fit with the partition piece. The casing 20 of the motor assembly 2 is provided with a mounting groove, and the sealing strip is filled in the mounting groove and is arranged in protrusion, and in the axial installation process, the partition piece axially presses the sealing strip, so that the partition piece and the corresponding casing 20 of the motor assembly 2 are relatively sealed.

[0044] The outer periphery of the stator piece 21 is wrapped with a stator support 24, and the outer circumferential surface of the rotor piece 22 is spaced apart and sleeved with a rotor protection sleeve 23, and the above-mentioned partition piece is jointly formed by the stator support 24 and the rotor protection sleeve 23. Among them, the stator support 24, the seal 25, the rotor protection sleeve 23 and the casing 20 jointly form a sealed cavity 26, and the rotor piece 22 is installed in the sealed cavity 26, which ensures the oil gas separation between the stator and the rotor and avoids the pollution of the stator piece 25 by oil gas.

[0045] In one mode, the stator support 24 and the rotor protection sleeve 23 are both plastic materials, and the stator support 24 and the rotor protection sleeve 23 are integrally injection molded. In another mode, the stator support 24 is a plastic material, and the rotor protection sleeve 23 is a ceramic material, and the stator support 24 is wrapped around the rotor protection sleeve 23 by injection molding. During the injection molding of the stator support 24, the rotor protection sleeve 23 is placed in the mold in advance. It is worth noting that the rotor protection sleeve 23 of ceramic material is in exposed state in radial direction opposite to the rotor piece 22.

[0046] The above-mentioned setting mode is that the stator support 24 is wrapped on the outside of the stator piece 21 in one-piece injection molding. Better guarantee that the stator piece 21 is not disturbed by oil gas.

[0047] The setting mode described above adopts full injection molding process for the stator support 24, which has simple structure, simple process, convenient assembly, good air tightness control and sufficient strength. In addition, since the stator part 21 has relatively stable structure, the structural strength of the stator support 24 wrapped around the stator part 21 and integrally injection molded is sufficiently high, and the rotor protection sleeve 23 is fixed on the inner wall of the stator support 24 in an integral molding manner, so that the thickness of the rotor protection sleeve 23 does not need to be considered, and the strength can be directly guaranteed. Therefore, the rotor protection sleeve 23 in the embodiment does not need to increase the wall thickness to improve the structural strength of the rotor protection sleeve 23. Compared with the prior art, the thickness of the rotor protection sleeve 23 in the embodiment is thinner, thereby greatly reducing the air gap distance between the stator part 21 and the rotor part 22. The small air gap distance can make the internal heating of the motor small, the magnetic field more stable, improve the output power of the motor, the movement stability between the stator part 21 and the rotor part 22 high, the amount of deflection small, thereby reducing the noise and prolonging the service life of the motor. In addition, the proportion of the motor installation space can be reduced, thereby providing more installation space for other parts, reducing the volume between the rotor and the stator, and achieving cost reduction and efficiency improvement.

[0048] In addition, since the structural strength of the stator support 24 is sufficiently high, the strength of the rotor protection sleeve 23 can be directly guaranteed, so that the thickness of the rotor protection sleeve 23 does not need to be increased to improve the structural strength, thereby greatly reducing the thickness of the rotor protection sleeve 23, and further reducing the air gap distance between the stator part 21 and the rotor part 22. In the embodiment, the wall thickness of the inner wall of the stator support 24 and the rotor protection sleeve 23 integrally formed in the radial direction is 0.3-0.5mm, and the minimum radial distance between the stator part 21 and the rotor part 22 is 1-1.5mm. Preferably, the outer diameter of the rotor part 22 is 22mm, and the inner diameter of the stator part 21 is 24.5mm.

[0049] As shown in Figure 3 The crankcase motor assembly also includes a circuit board 27, which is fixed inside the casing 20, and the circuit board 27 is located on the side of the stator part 21 away from the filter element assembly 3, so as to avoid oil and gas pollution of the circuit board 27.

[0050] As shown in Figure 3 The casing 20 includes a body part 200 and a cover part 201, and the body part 200 and the cover part 201 form a mounting cavity 202 for mounting the circuit board 27. The circuit board 27 is arranged near the side of the cover part 201, and the mounting cavity 202 has a large enough heat dissipation space, which is beneficial to keep the circuit board 27 at a constant allowable temperature for a long time.

[0051] Specifically, the body part 200 is outwardly convex to one side of the circuit board 27, and the circuit board 27 is fixed on the convex part 203 by screws. Further, the circuit board 27 and the convex part 203 are provided with a mounting plate 28, which is made of aluminum in this embodiment, so as to quickly conduct heat away from the circuit board 28 and prevent the components from overheating.

[0052] As shown in Figure 3 , the shell 20 is formed with a bearing chamber 204 near the notch 241 of the groove 240, and a sealing bearing 29 is fixed in the bearing chamber 204, which is used to support the rotating shaft 220 on the rotor 22. It is worth noting that after the sealing bearing 29 is installed in the bearing chamber 204, it will also be sealed, so that the rotating shaft 220 and the sealing bearing 29, and the bearing chamber 204 and the partition are relatively sealed.

[0053] As shown in Figure 6 , the outer wall of the stator support 24 is integrally formed with a plurality of fixing plates 242, which are fixed on the shell 20 by locking screws 243. Among them, the plurality of fixing plates 242 are evenly distributed on the outer wall of the stator support 24 to ensure the stability of the stator support 24. In this embodiment, three fixing plates 242 are evenly distributed on the outer wall of the stator support 24 to ensure the stability of the stator support 24.

[0054] As shown in Figure 5 , the inner wall of the shell 20 is provided with a mounting groove 205 corresponding to the position of the fixing plate 242, and the mounting groove 205 extends along the axial direction of the shell 20. The plurality of fixing plates 242 are correspondingly fixed in the mounting groove 205. During installation, the fixing plate 242 is aligned with the mounting groove 205, and then the stator support 24 is assembled in place along the axial direction of the mounting groove 205 until the fixing plate 242 contacts the bottom wall of the mounting groove 205, and then fixed by the locking screw 243. The mounting groove 205 not only plays a positioning and guiding role during installation, but also can prevent the stator support 24 from being radially offset during motor operation.

[0055] As shown in Figure 5 and Figure 6 , the two sides of at least one fixing plate 242 are provided with a positioning groove 245, and the side wall of the mounting groove 205 is provided with a positioning block 206 matched with the positioning groove 245, which further prevents the stator support 24 from being radially offset and improves the stability of the stator support 24.

[0056] The maximum outer diameter of the stator core 210 in the stator 21 is smaller than the maximum outer diameter of the stator support 24, and the minimum inner diameter of the stator core 210 is smaller than the minimum inner diameter of the stator support 24.

[0057] As shown in Figure 7As shown, the stator core 210 is at least partially exposed on the radial outer side of the stator support 24, and the heat on the stator support 24 can be directly transferred to the housing 20 for further heat dissipation, thereby improving the heat dissipation effect.

[0058] like Figure 7 As shown, a relief groove 246 is recessed into the outer wall of the stator support 24. The portion of the stator core 210 exposed radially outward from the stator support 24 is housed within the relief groove 246 to ensure that the maximum outer diameter of the stator core 210 is smaller than the maximum outer diameter of the stator support 24. This design achieves weight reduction, and the exposure of part of the stator core 210 also improves heat dissipation efficiency.

[0059] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A crankcase motor assembly comprising an outer housing (1) and a motor assembly (2) and a filter element assembly (3) fixed within the outer housing (1), characterized in that, The motor assembly (2) comprises a casing (20), a stator (21) and a rotor (22) installed in the casing (20), the stator (21) is injection molded with a partition accommodating the rotor (22), the partition is open at one axial end and sealed at the other end, a sealing element (25) is arranged between the open end and the casing to fully seal the rotor (22).

2. The crankcase motor assembly of claim 1, wherein, The periphery of the stator (21) is wrapped with a stator support (24), and the outer circumferential surface of the rotor (22) is spacedly sleeved with a rotor protection sleeve (23), and the stator support (24) and the rotor protection sleeve (23) jointly constitute the partition.

3. The crankcase motor assembly of claim 2, wherein, The stator support (24) and the rotor protection sleeve (23) are both made of plastic material, and the stator support (24) and the rotor protection sleeve (23) are integrally injection molded.

4. The crankcase motor assembly of claim 2, wherein, The stator support (24) is made of plastic material, the rotor protection sleeve (23) is made of ceramic material, and the stator support (24) is injection molded around the rotor protection sleeve (23).

5. The crankcase motor assembly of claim 2, wherein, The stator support (24), the sealing element (25), the rotor protection sleeve (23) and the casing (20) jointly form a sealed cavity (26), and the rotor (22) is installed in the sealed cavity (26).

6. The crankcase motor assembly of claim 1, wherein, The axial section of the partition is in an inverted U shape, the partition has a groove (240) collinear with the axis, the sealing element (25) is arranged between the partition and the casing (20) on the side close to the notch (241) of the groove (240), and the rotor (22) is accommodated in the groove (240) and gap-fitted with the inner wall forming the groove (240).

7. The crankcase motor assembly of claim 1, wherein, The minimum radial distance between the stator (21) and the rotor (22) is 1-1.5 mm.

8. The crankcase motor assembly of claim 2, wherein, The wall thickness of the inner wall of the stator support (24) and the rotor protection sleeve (23) integrally formed in the radial direction is 0.3-0.5 mm.

9. The crankcase motor assembly of claim 1, wherein, A circuit board (27) is further included, the circuit board (27) is fixed inside the casing (20), and the circuit board (27) is located on the side of the stator (21) away from the filter element assembly (3).

10. The crankcase motor assembly of claim 9, wherein, The casing (20) comprises a body part (200) and a cover part (201), and an installation cavity (202) for installing the circuit board (27) is formed between the body part (200) and the cover part (201).

11. The crankcase motor assembly of claim 10, wherein, The body part (200) is outwardly convex on the side facing the circuit board (27) to form a boss (203), and the circuit board (27) is fixed on the boss (203).

12. The crankcase motor assembly of claim 11, wherein, An installation plate (28) is arranged between the circuit board (27) and the boss (203), and the installation plate (28) is made of aluminum material.

13. The crankcase motor assembly of claim 6, wherein, The casing (20) is formed with a bearing chamber (204) on the side close to the notch (241) of the groove (240), a sealing bearing (29) is fixed in the bearing chamber (204), and the sealing bearing (29) is used to support a rotating shaft (220) on the rotor (22).

14. The crankcase motor assembly of claim 2, wherein, A plurality of fixing plates (242) are integrally formed on the peripheral wall of the stator support (24), and are fixed to the casing (20) by locking screws (243).

15. The crankcase motor assembly of claim 14, wherein, An installation groove (205) is formed on the inner wall of the casing (20) corresponding to the position of the fixing plate (242), and extends along the axial direction of the casing (20), and the plurality of fixing plates (242) are correspondingly fixed in the installation groove (205).

16. The crankcase motor assembly of claim 15, wherein, Positioning grooves (245) are formed on both sides of at least one of the fixing plates (242), and positioning blocks (206) are protruded on the side wall of the installation groove (205) and are matched with the positioning grooves (245).

17. The crankcase motor assembly of claim 2, wherein, The maximum outer diameter of the stator core (210) in the stator member (21) is smaller than the maximum outer diameter of the stator support (24), and the minimum inner diameter of the stator core (210) is smaller than the minimum inner diameter of the stator support (24).

18. The crankcase motor assembly of claim 17, wherein, The stator core (210) is at least partially exposed to the radial outer side of the stator support (24).

19. The crankcase motor assembly of claim 18, wherein, An avoiding groove (246) is concavely formed in the peripheral wall of the stator support (24), and the part of the stator core (210) exposed to the radial outer side of the stator support (24) is accommodated in the avoiding groove (246).

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