Electric vacuum pump

Abstract

The utility model provides an electric vacuum pump which comprises a crankshaft provided with at least one eccentric part; the near end of each connecting rod is connected with one eccentric part; the far end of each connecting rod is connected with one piston through one connecting assembly; a first through hole is formed in the far end of the piston, and a first limiting part is arranged on the inner wall of the first through hole; the air valve seat is arranged in the first through hole, and a second limiting part matched with the first limiting part is arranged on the outer wall of the air valve seat; the air valve is arranged on the side, close to the connecting rod, of the air valve seat. According to the electric vacuum pump, the first limiting part is arranged on the inner wall of the first through hole of the piston, the second limiting part is arranged on the outer wall of the air valve seat, and the first limiting part is matched with the second limiting part, so that the air valve seat is stably fixed in the first through hole and is not easy to fall off, and the working reliability of the electric vacuum pump is improved.

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] In existing technologies, the valve seat of an electric vacuum pump is fixed in the piston by an interference fit and moves with the piston. However, there is a risk that the existing valve seat may fall out of the piston, thus affecting the reliability of the electric vacuum pump. Therefore, the structure of the electric vacuum pump needs to be improved to address the problem of the valve seat falling out of the piston.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this utility model, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0005] To address the problems in the existing technology, the purpose of this utility model is to provide an electric vacuum pump that reduces the risk of the valve seat falling off the piston and improves the operational reliability of the electric vacuum pump.

[0006] This utility model embodiment provides an electric vacuum pump, comprising:

[0007] The crankshaft has at least one eccentric part;

[0008] Multiple links, each link having its proximal end connected to one of the eccentric portions;

[0009] A plurality of pistons and connecting assemblies, wherein the distal end of each connecting rod is connected to a piston via a connecting assembly; the distal end of the piston is provided with a first through hole, and a first limiting portion is provided on the inner wall of the first through hole;

[0010] A valve seat is provided inside the first through hole, and a second limiting part is provided on the outer wall of the valve seat to match the first limiting part;

[0011] An air valve is located on the side of the air valve seat near the connecting rod.

[0012] In some embodiments, the first limiting portion is one of a groove or a boss, and the second limiting portion is the other of the groove or the boss.

[0013] In some embodiments, the groove is an annular groove, and the boss is an annular boss.

[0014] In some embodiments, the cross-section of the boss or the groove is circular, semi-circular, rectangular, square, or triangular.

[0015] In some embodiments, the valve seat is disc-shaped, and the valve seat has a second through hole at its center and vent holes arranged circumferentially around the second through hole.

[0016] In some embodiments, the air valve is disc-shaped, and the center of the air valve has a protrusion that matches the second through hole.

[0017] In some embodiments, the valve seat is a plastic valve seat.

[0018] In some embodiments, a needle roller bearing is further included, disposed between the proximal end of the connecting rod and the eccentric portion. In some embodiments, a rotating shaft is further included, connected to the crankshaft.

[0019] In some embodiments, the device further includes a motor, the motor including a rotor connected to the rotating shaft.

[0020] The electric vacuum pump provided by this utility model has the following advantages:

[0021] The electric vacuum pump of this invention includes a crankshaft with at least one eccentric portion, multiple connecting rods, multiple pistons, and multiple connecting assemblies. The proximal end of each connecting rod is connected to one of the eccentric portions; the distal end of each connecting rod is connected to one of the pistons via a connecting assembly. The distal end of each piston has a first through hole, and the inner wall of the first through hole has a first limiting portion. A valve seat is located inside the first through hole, and the outer wall of the valve seat has a second limiting portion adapted to the first limiting portion. A valve is located on the side of the valve seat near the connecting rod. By providing a first limiting portion on the inner wall of the first through hole of the piston and a second limiting portion on the outer wall of the valve seat, the first and second limiting portions cooperate to ensure the valve seat is stably fixed within the first through hole, preventing it from easily falling off and improving the operational reliability of the electric vacuum pump. Attached Figure Description

[0022] 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.

[0023] Figure 1 This is a cross-sectional view of the piston structure of an electric vacuum pump according to an embodiment of the present invention;

[0024] Figure 2 This is a partial exploded view of a piston structure according to an embodiment of the present invention;

[0025] Figure 3 This is a partial exploded view of a piston structure according to an embodiment of the present invention;

[0026] Figure 4 yes Figure 1 A magnified view of the area indicated by the circle;

[0027] Figure 5 This is the front view of the valve seat;

[0028] Figure 6 This is a side view of the valve seat.

[0029] Figure label:

[0030] 10-link

[0031] 20 Pistons

[0032] 21 First through hole

[0033] 211 First Limiting Part

[0034] 30 Connecting components

[0035] 40 air valve

[0036] 41. Protrusion

[0037] 50 Valve Seat

[0038] 51 Second Limiting Part

[0039] 52 Second Through Hole

[0040] 53 Vent holes

[0041] 60 needle roller bearing DETAILED DESCRIPTION

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] To address the problems in the prior art, this utility model provides an electric vacuum pump, comprising: a crankshaft with at least one eccentric portion; multiple connecting rods, each connecting rod having its proximal end connected to one of the eccentric portions; multiple pistons and a connecting assembly, each connecting rod having its distal end connected to one of the pistons via the connecting assembly; a first through hole at the distal end of each piston, a first limiting portion valve seat disposed within the first through hole on its inner wall, and a second limiting portion adapted to the first limiting portion on the outer wall of the valve seat; and a valve disposed on the side of the valve seat near the connecting rod. This technical solution, by providing a first limiting portion on the inner wall of the first through hole of the piston and a second limiting portion on the outer wall of the valve seat, with the first and second limiting portions cooperating, ensures that the valve seat is stably fixed within the first through hole, preventing it from easily falling off, thus improving the operational reliability of the electric vacuum pump.

[0047] The electric vacuum pump of this utility model will be further described below with reference to the accompanying drawings. It should be understood that the specific embodiments are not intended to limit the scope of protection of this utility model. Figure 1 A cross-sectional view of the piston structure of an electric vacuum pump according to an embodiment of the present invention is shown; Figure 2 A partial exploded view of a piston structure according to an embodiment of the present invention is shown; Figure 3 A partial exploded view of a piston structure according to an embodiment of the present invention is shown; Figure 4 It shows Figure 1 A magnified view of the circled area; Figure 5 The front view of the valve seat is shown; Figure 6 A side view of the valve seat is shown.

[0048] like Figures 1 to 6 As shown, the electric vacuum pump includes a crankshaft (not shown), connecting rod 10, piston 20, connecting assembly 30, valve 40, and valve seat 50. Further, the crankshaft has at least one eccentric portion; each connecting rod 10 has a proximal end connected to an eccentric portion; each connecting rod 10 has a distal end connected to a piston 20 via a connecting assembly 30; the distal end of the piston 20 has a first through hole 21, and the inner wall of the first through hole 21 has a first limiting portion 211; the valve seat 50 is located inside the first through hole 21, and the outer wall of the valve seat 50 has a second limiting portion 51 adapted to the first limiting portion 211; the valve 40 is located on the side of the valve seat 50 near the connecting rod 10.

[0049] The first limiting part 211 cooperates with the second limiting part 51 to stably fix the valve seat 50 in the first through hole 21, making it less likely to fall out of the first through hole 21, thereby improving the fixing reliability of the valve seat 50 and the working reliability of the electric vacuum pump.

[0050] Further, please refer to Figure 4 In this embodiment, the first limiting part 211 is a boss, and the second limiting part 51 is a groove. When the valve seat 50 is assembled into the first through hole 21, the boss and the groove cooperate to firmly fix the valve seat 50 into the first through hole 21. In other embodiments, the first limiting part 211 can also be a groove, and the second limiting part 51 can be a boss, which can also firmly fix the valve seat 50 into the first through hole 21. However, the specific setting of the first limiting part 211 and the second limiting part 51 as a groove or a boss structure can be set according to actual needs, and no specific limitation is made here. In other embodiments, the first limiting part 211 and the second limiting part 51 are not limited to the above-mentioned boss or groove, and can also be a snap-fit ​​structure that can be fixed to each other, and no specific limitation is made here.

[0051] Furthermore, in this embodiment, the groove of the second limiting part 51 is an annular groove, and the boss of the first limiting part 211 is an annular boss. In other embodiments, the second limiting part 51 and the first limiting part 211 may also be non-continuous annular grooves to reduce the difficulty of installing the valve seat 50. The specific structure and number of grooves or bosses on the valve seat 50 can be set according to actual needs and are not specifically limited here.

[0052] Furthermore, in some embodiments, the cross-section of the boss or the groove is circular, semi-circular, rectangular, square, or triangular, etc. For example... Figure 4 As shown, in this embodiment, the cross-sections of the boss and the groove are triangular. The shape of the cross-section of the groove or the boss can be set according to actual needs, and is not specifically limited here.

[0053] Furthermore, in a preferred embodiment, the valve seat 50 is a plastic valve seat. The plastic valve seat 50 can deform during assembly, which reduces the difficulty of assembling the valve seat 50 into the first through hole 21 and improves the assembly efficiency of assembling the valve seat 50.

[0054] Furthermore, such as Figure 5 and Figure 6 As shown, the valve seat 50 is disc-shaped, and the valve seat 50 has a second through hole 52 at its center and vent holes 53 arranged circumferentially around the second through hole 52.

[0055] Furthermore, such as Figure 3 As shown, the air valve 40 is disc-shaped, and a protrusion 41 adapted to the second through hole 52 is provided at the center of the air valve 40. The protrusion 41 is installed in the second through hole 52, which can fix the air valve seat 50 to the air valve 40. When the air valve 40 contacts the air valve seat 50 under pressure, the vent hole 53 on the air valve seat 50 is closed.

[0056] Furthermore, in some embodiments, such as Figures 1 to 3 As shown, the electric vacuum pump also includes a needle roller bearing 60, located between the proximal end of the connecting rod 10 and the eccentric portion. The needle roller bearing 60 allows for the transmission of a larger radial torque, ensuring that the torque from the eccentric portion is smoothly transmitted to the piston 20.

[0057] Furthermore, the electric vacuum pump also includes a rotating shaft (not shown in the figure) connected to the crankshaft. The rotating shaft can drive the crankshaft to rotate.

[0058] Furthermore, the electric vacuum pump also includes a motor (not shown in the figure), which includes a rotor connected to a rotating shaft. When the motor is running, the rotor rotates to drive the rotating shaft. When the electric vacuum pump is running, the motor drives the rotating shaft to rotate, the rotating shaft drives the eccentric part to rotate, the rotation of the eccentric part drives the connecting rod 10 to swing, and the connecting rod 10 drives the piston 20 to reciprocate.

[0059] In summary, the electric vacuum pump provided by this utility model has the following advantages:

[0060] By setting a first limiting part on the inner wall of the first through hole of the piston and a second limiting part on the outer wall of the valve seat, the first limiting part and the second limiting part cooperate to fix the valve seat stably in the first through hole, making it less likely to fall off, thereby improving the working reliability of the electric vacuum pump.

[0061] 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 crankshaft has at least one eccentric part; Multiple links, each link having its proximal end connected to one of the eccentric portions; A plurality of pistons and connecting assemblies, wherein the distal end of each connecting rod is connected to a piston via a connecting assembly; the distal end of the piston is provided with a first through hole, and a first limiting portion is provided on the inner wall of the first through hole; A valve seat is provided inside the first through hole, and a second limiting part is provided on the outer wall of the valve seat to match the first limiting part; The air valve is fixed to the side of the air valve seat near the connecting rod.

2. The electric vacuum pump according to claim 1, characterized in that, The first limiting part is one of the groove or the boss, and the second limiting part is the other of the groove or the boss.

3. The electric vacuum pump according to claim 2, characterized in that, The groove is an annular groove, and the boss is an annular boss.

4. The electric vacuum pump according to claim 2, characterized in that, The cross-section of the boss or the groove is circular, semi-circular, rectangular, square, or triangular.

5. The electric vacuum pump according to claim 1, characterized in that, The valve seat is a plastic valve seat.

6. The electric vacuum pump according to claim 1, characterized in that, The valve seat is disc-shaped, and the valve seat has a second through hole at its center and vent holes arranged circumferentially around the second through hole.

7. The electric vacuum pump according to claim 6, characterized in that, The air valve is disc-shaped, and the center of the air valve has a protrusion that matches the second through hole.

8. The electric vacuum pump according to claim 1, characterized in that, It also includes a needle roller bearing, located between the proximal end of the connecting rod and the eccentric portion.

9. The electric vacuum pump according to claim 1, characterized in that, It also includes a rotating shaft that connects to the crankshaft.

10. The electric vacuum pump according to claim 9, characterized in that, It also includes a motor, which includes a rotor connected to the rotating shaft.

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