Electric vacuum pump

Abstract

The utility model provides an electric vacuum pump, which comprises a first shell, a second shell and a vacuum pump, the driving assembly is arranged in the first cavity and comprises a motor, a first rotating shaft, a first bearing and a second bearing, the first rotating shaft penetrates out of the two ends of the motor, the first bearing is arranged at the first end of the first rotating shaft in a sleeving mode, and the motor drives the first rotating shaft to rotate; the pump body assembly comprises a crankshaft which is connected with the second end of the first rotating shaft, and the crankshaft is sleeved with a second bearing; the first shell comprises a first fixing part and a second fixing part which are oppositely arranged, the first bearing is arranged on the first fixing part, and the second bearing is arranged on the second fixing part. According to the electric vacuum pump, the first bearing and the second bearing are both fixed in the first shell, it can be guaranteed that the bearings have good positioning accuracy and fixing stability, then the axial jumping problem of the first rotating shaft can be solved, noise is lowered, bearing abrasion is reduced, and the service life of the electric vacuum pump is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of vacuum pump technology, specifically to an electric vacuum pump. Background Art

[0002] Braking systems for automobiles include brake boosters that amplify braking force using the negative pressure from the engine's intake manifold. In motor vehicles with electric or hybrid powertrains, there are situations where the engine's intake manifold negative pressure is unavailable; therefore, an electric vacuum pump is used to generate the negative pressure supplied to the brake booster.

[0003] Existing electric vacuum pumps employ a dual-piston opposed structure and a two-stage pressurization design, achieving good pumping efficiency. However, because the two-stage pressurization requires an additional chamber, the structure is complex and places higher demands on the transmission system. Furthermore, the rotating shaft in existing electric vacuum pump designs suffers from large axial runout, resulting in the pump's lifespan not meeting expectations. Utility Model Content

[0004] In view of the problems in the prior art, the purpose of this utility model is to provide an electric vacuum pump that improves the axial runout of its rotating shaft and increases the service life of the electric vacuum pump.

[0005] This utility model embodiment provides an electric vacuum pump, comprising:

[0006] The first housing has a first cavity inside;

[0007] A drive assembly is disposed within the first cavity. The drive assembly includes a motor, a first rotating shaft, a first bearing, and a second bearing. The first rotating shaft extends through both ends of the motor, and the first bearing is sleeved on the first end of the first rotating shaft. The motor drives the first rotating shaft to rotate.

[0008] The pump body assembly includes a crankshaft connected to the second end of the first rotating shaft, and the second bearing is sleeved on the outside of the crankshaft;

[0009] The first housing includes a first fixed part and a second fixed part disposed opposite to each other, the first bearing is disposed in the first fixed part, and the second bearing is disposed in the second fixed part.

[0010] In some embodiments, the second fixing portion includes a second side support portion and a second end face support portion. The second side support portion is used to fix the side of the second bearing, and the second end face support portion is used to fix at least a portion of the end face of the first bearing facing away from the motor.

[0011] In some embodiments, it further includes a means for securing the motor and securing at least a portion of the end face of the second bearing near the motor side.

[0012] In some embodiments, the first housing includes a first partial housing and a second partial housing, the first partial housing is provided with the first fixing part, the second partial housing is provided with the second fixing part, and the first partial housing and the second partial housing together form the first cavity.

[0013] In some embodiments, the edge of the support plate abuts against the inner wall of the first partial housing, and the support plate is provided with a mounting groove on the side near the second partial housing, through which the first partial housing is fixedly connected to the support plate.

[0014] In some embodiments, the first fixing part includes a first side support part and a first end support part, the first side support part being used to fix the side of the first bearing, and the first end support part being used to fix the two end faces of the first bearing.

[0015] In some embodiments, a second housing is further included, the second housing having a second cavity inside, the pump assembly being disposed in the second cavity, and the drive assembly driving the pump assembly to operate.

[0016] In some embodiments, the crankshaft includes a second rotating shaft and at least one eccentric shaft sleeved outside the second rotating shaft, wherein the first rotating shaft is coaxially and fixedly connected to the second rotating shaft.

[0017] In some embodiments, the second housing includes a third fixing part, and the first housing and the second housing are fixedly connected by the third fixing part.

[0018] In some embodiments, the pump body assembly further includes a connecting rod, a piston, and a connecting assembly, wherein the eccentric shaft is connected to the outside of the second rotating shaft, the proximal end of the connecting rod is connected to one of the eccentric shafts, and the distal end of the connecting rod is connected to one of the pistons via a connecting assembly.

[0019] The electric vacuum pump provided by this utility model has the following advantages:

[0020] By fixing both the first bearing and the second bearing in the first housing, good positioning accuracy and good fixing stability of the first bearing and the second bearing can be ensured. This can improve the axial runout problem of the first rotating shaft, reduce the noise of the electric vacuum pump during operation, reduce wear, and improve the service life of the electric vacuum pump. Attached Figure Description

[0021] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0022] Figure 1 A cross-sectional schematic diagram of an electric vacuum pump in the prior art is shown;

[0023] Figure 2 A partial schematic diagram of the motor assembly in a prior art electric vacuum pump is shown;

[0024] Figure 3 This is a cross-sectional schematic diagram of an electric vacuum pump according to an embodiment of the present invention;

[0025] Figure 4 This is a partial schematic diagram of the motor assembly in an electric vacuum pump according to an embodiment of the present invention.

[0026] Figure label:

[0027] 10 First housing 21 Motor

[0028] 11 First part of the housing 22 First rotating shaft

[0029] 111 First fixing part 23 First bearing

[0030] 1111 First side support 24 Second bearing

[0031] 1112 First end face support part 30 Second shell

[0032] 12 Second part of the housing 31 Third fixing part

[0033] 121 Second fixing part 40 Pump body assembly

[0034] 1211 Second side support part 41 Second rotating shaft

[0035] 1212 Second end face support part 42 Eccentric shaft

[0036] 13 Support plate 43 Connecting rod

[0037] 20 Drive components 44 Pistons DETAILED DESCRIPTION

[0038] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that the invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0039] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics represented in connection with that embodiment or example, which are included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate different embodiments or examples represented in this application, as well as features of different embodiments or examples.

[0040] Furthermore, the terms "first" and "second" are used for illustrative purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the representation of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0041] It should be further understood that the terms "comprising" or "including" indicate the presence of a feature, step, operation, element, component, item, kind, and / or group, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" as used herein are interpreted as inclusive, or mean any one or any combination thereof. Therefore, "A, B, or C" or "A, B, and / or C" means "any one of the following: A; B; C; A and B; A and C; B and C; A, B, and C." Exceptions to this definition only arise when a combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0042] Figure 1 A cross-sectional schematic diagram of an electric vacuum pump in the prior art is shown. Figure 2 A partial schematic diagram of the motor assembly in a prior art electric vacuum pump is shown. (See attached diagram.) Figure 1 and Figure 2 As shown, the electric vacuum pump includes a first housing 10', a drive assembly 20', and a second housing 30'. The drive assembly 20' includes a motor 21', a first rotating shaft 22', a first bearing 23', and a second bearing 24'. The first bearing 23' is fixed inside the first housing 10', and the second bearing 24' is disposed inside the second housing 30'. Only the side of the second bearing 24' is restricted and fixed by the second housing 30', while the end of the second bearing 24' facing away from the motor 21' is not restricted and fixed. Therefore, the second bearing 24' is not securely fixed, which may cause the first rotating shaft 22' to tilt when rotating (e.g., as shown in the image). Figure 2The inclination shown by the thick dashed line causes a large axial runout of the first rotating shaft 22', which in turn damages the sealing of the first bearing 23' and the second bearing 24', leading to lubricant leakage, bearing failure, and a shortened lifespan of the electric vacuum pump.

[0043] To address the aforementioned problems, this utility model provides an electric vacuum pump. Figure 3 A schematic diagram of an electric vacuum pump provided in an embodiment of the present invention is shown; Figure 4 A partial schematic diagram of the motor assembly in an electric vacuum pump according to an embodiment of the present invention is shown. Figure 3 and Figure 4 As shown, the electric vacuum pump includes:

[0044] The first housing 10 has a first cavity inside it;

[0045] The drive assembly 20 is located in the first cavity. The drive assembly 20 includes a motor 21, a first rotating shaft 22, a first bearing 23 and a second bearing 24. The first rotating shaft 22 extends through both ends of the motor. The first bearing 23 is sleeved on the first end of the first rotating shaft 22. The motor 21 drives the first rotating shaft 22 to rotate.

[0046] The pump body assembly 40 includes a crankshaft connected to the second end of the first rotating shaft 22, and a second bearing 24 sleeved on the outside of the crankshaft;

[0047] The first housing 10 includes a first fixing part 111 and a second fixing part 121 disposed opposite to each other, a first bearing 23 disposed in the first fixing part 111, and a second bearing 24 disposed in the second fixing part 121.

[0048] By fixing both the first bearing 23 and the second bearing 24 in the first housing 10, it is possible to ensure that the first bearing 23 and the second bearing 24 have good positioning accuracy and good fixing stability. This can improve the axial runout problem of the first rotating shaft 22, reduce the noise of the electric vacuum pump during operation, reduce bearing wear, and improve the service life of the electric vacuum pump.

[0049] Furthermore, the second fixing part 121 includes a second side support part 1211 extending along a first direction and a second end face support part 1212 extending along a second direction. The second side support part 1211 is used to fix the side of the second bearing 24, and the second end face support part 1212 is used to fix at least a portion of the end face of the second bearing 24 facing away from the motor 21. Here, the first direction is the vertical direction as seen from the paper, and the second direction is the horizontal direction as seen from the paper. The second side support part 1211 and the second end face support part 1212 can firmly fix the second bearing 24, thereby improving the axial movement of the first rotating shaft 22 during movement.

[0050] Further, please refer to Figure 3 The electric vacuum pump also includes a support plate 13 for fixing the motor 21 and at least a portion of the end face of the second bearing 24 near the motor 21. The side and end faces of the second bearing 24 are securely fixed, thus improving the axial movement of the first rotating shaft 22 during rotation.

[0051] Furthermore, the first housing 10 includes a first partial housing 11 and a second partial housing 12. The first partial housing 11 is provided with a first fixing part 111, and the second partial housing 12 is provided with a second fixing part 121. The first partial housing 11 and the second partial housing 12 together form a first cavity. When assembling the drive component, firstly, the first bearing 23 is installed into the first fixing part 111 of the first partial housing 11 and the motor 21 is installed. Then, the second bearing 24 is installed into the second fixing part 121 of the second partial housing 12. Finally, the second partial housing 12 is fixedly connected to the first partial housing 11, thereby aligning the motor shaft. Fixing the first bearing 23 and the second bearing 24 inside the first housing 10 reduces the assembly difficulty of the drive component and improves the assembly accuracy of the drive component.

[0052] Furthermore, the edge of the support plate 13 abuts against the inner wall of the first housing 11, and the support plate 13 is provided with a mounting groove 131 on the side of the support plate 13 near the second housing 12, through which the second housing 12 is fixedly connected to the support plate 13.

[0053] The first fixing part 111 includes a first side support part 1111 and a first end support part 1112. The first side support part 1111 is used to fix the side of the first bearing 23, and the first end support part 1112 is used to fix the two end faces of the first bearing 23 to secure the first bearing 23 firmly.

[0054] Furthermore, such as Figure 3 As shown, the electric vacuum pump also includes a second housing 30, inside which a second cavity is provided, and the pump body assembly 40 is disposed in the second cavity.

[0055] Furthermore, such as Figure 3 As shown, the crankshaft includes a second rotating shaft 41 and at least one eccentric shaft 42 sleeved outside the second rotating shaft 41. The first rotating shaft 22 is coaxially and fixedly connected to the second rotating shaft 41. The motor 21 drives the first rotating shaft 22 to rotate, which in turn drives the second rotating shaft 41 and the eccentric shaft 42 to rotate.

[0056] Furthermore, the second housing 30 includes a third fixing part 31, through which the first housing 10 and the second housing 30 are fixedly connected. Here, the third fixing part 31 is a groove that can accommodate the second housing 12.

[0057] Furthermore, the pump body assembly 40 also includes a connecting rod 43, a piston 44, and a connecting assembly. An eccentric shaft 42 is connected to the outside of the second rotating shaft 41. The proximal end of the connecting rod 43 is connected to an eccentric shaft 42, and the distal end of the connecting rod 43 is connected to a piston 44 via a connecting assembly. This embodiment includes two eccentric shafts 42, two connecting rods 43, two pistons 44, and two connecting assemblies. When the electric vacuum pump is running, the motor 21 drives the first rotating shaft 22 to rotate, which in turn drives the second rotating shaft 41 to rotate. The second rotating shaft 41 drives the eccentric shaft 42 to rotate, and the rotation of the eccentric shaft 42 causes the connecting rod 43 to swing, which in turn drives the piston 44 to reciprocate.

[0058] In summary, the electric vacuum pump provided by this utility model has the following advantages:

[0059] By fixing both the first bearing and the second bearing in the first housing, good positioning accuracy and good fixing stability of the first bearing and the second bearing can be ensured, thereby improving the axial runout problem that occurs when the first rotating shaft rotates, reducing the noise of the electric vacuum pump during operation, reducing bearing wear, and increasing the service life of the electric vacuum pump.

[0060] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. An electric vacuum pump, characterized in that, include: The first housing has a first cavity inside; A drive assembly is disposed within the first cavity. The drive assembly includes a motor, a first rotating shaft, a first bearing, and a second bearing. The first rotating shaft extends through both ends of the motor, and the first bearing is sleeved on the first end of the first rotating shaft. The motor drives the first rotating shaft to rotate. The pump body assembly includes a crankshaft connected to the second end of the first rotating shaft, and the second bearing is sleeved on the outside of the crankshaft; The first housing includes a first fixed part and a second fixed part disposed opposite to each other, the first bearing is disposed in the first fixed part, and the second bearing is disposed in the second fixed part.

2. The electric vacuum pump according to claim 1, characterized in that, The second fixing part includes a second side support part and a second end support part. The second side support part is used to fix the side of the second bearing, and the second end support part is used to fix at least a portion of the end face of the first bearing facing away from the motor.

3. The electric vacuum pump according to claim 2, characterized in that, It also includes a support plate for securing the motor, and for securing at least a portion of the end face of the second bearing near the motor.

4. The electric vacuum pump according to claim 3, characterized in that, The first housing includes a first partial housing and a second partial housing. The first partial housing is provided with the first fixing part, and the second partial housing is provided with the second fixing part. The first partial housing and the second partial housing together form the first cavity.

5. The electric vacuum pump according to claim 4, characterized in that, The edge of the support plate abuts against the inner wall of the first part of the housing. The support plate has a mounting groove on the side near the second part of the housing, through which the first part of the housing is fixedly connected to the support plate.

6. The electric vacuum pump according to claim 1, characterized in that, The first fixing part includes a first side support part and a first end support part. The first side support part is used to fix the side of the first bearing, and the first end support part is used to fix the two end faces of the first bearing.

7. The electric vacuum pump according to claim 1, characterized in that, It also includes a second housing, which has a second cavity inside, and the pump body assembly is disposed in the second cavity.

8. The electric vacuum pump according to claim 7, characterized in that, The crankshaft includes a second rotating shaft and at least one eccentric shaft sleeved outside the second rotating shaft; the first rotating shaft and the second rotating shaft are coaxially and fixedly connected.

9. The electric vacuum pump according to claim 8, characterized in that, The second housing includes a third fixing part, and the first housing and the second housing are fixedly connected by the third fixing part.

10. The electric vacuum pump according to claim 8, characterized in that, The pump assembly also includes a connecting rod, a piston, and a connecting assembly. The eccentric shaft is connected to the outside of the second rotating shaft. The proximal end of the connecting rod is connected to one of the eccentric shafts, and the distal end of the connecting rod is connected to one of the pistons via a connecting assembly.

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