Electric vacuum pump

Abstract

The utility model provides an electric vacuum pump which comprises an eccentric shaft 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; the connecting assembly comprises a pin and a second needle bearing, the first end of the pin is connected with the far end of the connecting rod, the second end of the pin is connected with the piston, and the second needle bearing is arranged between the second end of the pin and the piston. The needle bearings are used for replacing bushings, and gaps between the pins and the second needle bearings are small, so that the connecting stability among the connecting rod, the piston and the second needle bearings can be improved, the axial run-out problem of the connecting rod can be solved, the influence of run-out of the connecting rod on the needle bearings at the eccentric part is reduced, and the service life of the connecting rod is prolonged. Working reliability of the electric vacuum pump is improved, and noise during operation of the vacuum pump is reduced.

Description

Technical Field

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

[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 suffer from high operating noise and easy grease leakage in the needle roller bearings, affecting their operational reliability. Therefore, improvements to the electric vacuum pump structure are necessary to mitigate these problems.

[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 noise during operation, improves the problem of easy lubrication oil leakage in needle roller bearings, and enhances the operational reliability of the electric vacuum pump.

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

[0007] An eccentric shaft, having at least one eccentric part;

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

[0009] Multiple pistons and connecting assemblies, wherein the distal end of each of the connecting rods is connected to one of the pistons via one of the connecting assemblies;

[0010] The connecting assembly includes a pin and a second needle roller bearing. The first end of the pin is connected to the distal end of the connecting rod, and the second end of the pin is connected to the piston. The second needle roller bearing is disposed between the second end of the pin and the piston.

[0011] In some embodiments, a first washer is further provided between the end of the second needle roller bearing opposite to the connecting rod and the pin.

[0012] In some embodiments, a second shim is further included, disposed between one end of the second needle roller bearing near the connecting rod and the connecting rod.

[0013] In some embodiments, the first gasket has a first through hole at its center, and the first end of the pin passes through the first through hole.

[0014] In some embodiments, the first gasket is an annular structure.

[0015] In some embodiments, the second gasket has a second through hole at its center, and the first end of the pin passes through the second through hole.

[0016] In some embodiments, the second gasket has an annular structure.

[0017] In some embodiments, a first needle roller bearing is further included, disposed between the proximal end of the connecting rod and the eccentric shaft.

[0018] In some embodiments, the electric vacuum pump includes two eccentric shafts, two connecting rods, two pistons, and two connecting assemblies, wherein the two connecting rods are positioned opposite each other at a distance of 180°, and the two pistons are positioned opposite each other at a distance of 180°.

[0019] In some embodiments, the system further includes a motor and a rotating shaft, wherein the motor drives the rotating shaft to rotate and the rotating shaft is connected to the eccentric shaft.

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

[0021] By replacing the bushing with a needle roller bearing, the clearance between the pin and the needle roller bearing is reduced, which improves the stability of the connection between the pin and the needle roller bearing. This can improve the axial runout of the connecting rod, reduce the impact of the connecting rod runout on the needle roller bearing at the eccentric part, and improve the 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 schematic diagram of an electric vacuum pump in the prior art;

[0024] Figure 2 yes Figure 1 A magnified view of the area indicated by the circle;

[0025] Figure 3 This is a partial exploded view of an electric vacuum pump provided in one embodiment of the present invention;

[0026] Figure 4 This is a partial cross-sectional schematic diagram of an electric vacuum pump provided in one embodiment of the present invention.

[0027] Figure label:

[0028] 10 Rotation axis

[0029] 20 Eccentric Shaft

[0030] 30-link

[0031] 40 Piston

[0032] 50 pins

[0033] 60' Bushing in the prior art

[0034] 70 First needle roller bearing

[0035] 80 Second needle roller bearing

[0036] 91 First gasket

[0037] 911 First Through Hole

[0038] 92 Second gasket

[0039] 921 Second Through Hole Detailed Implementation

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] Figure 1 A schematic diagram of the structure of an electric vacuum pump in the prior art is shown; Figure 2 It shows Figure 1 An enlarged view of the area indicated by the dashed box. (See diagram below.) Figure 1 and Figure 2 As shown, the electric vacuum pump includes a rotating shaft 10, an eccentric shaft 20, a connecting rod 30, a piston 40, a pin 50, a bushing 60', and a first needle roller bearing 70. The eccentric shaft 20 is connected to the rotating shaft 10. The proximal end of the connecting rod 30 is sleeved on the outside of the eccentric shaft 20, and the first needle roller bearing 70 is provided between the proximal end of the connecting rod 30 and the eccentric shaft 20. The distal end of the connecting rod 30 is fixedly connected to the distal end of the piston 40 by the pin 50 and the bushing 60'. When the rotating shaft 10 rotates, it drives the eccentric shaft 20 to rotate. The rotation of the eccentric shaft 20 causes the connecting rod 30 to swing, and the connecting rod 30 drives the piston 40 to reciprocate.

[0045] Because of the gap between pin 50 and bushing 60', the connecting rod 30 will move axially when the electric vacuum pump is running. This will cause abnormal noise between bushing 60' and connecting rod 30, and increase the noise of the electric vacuum pump during operation. At the same time, the axial movement of connecting rod 30 will also compress the first needle roller bearing 70 located between eccentric shaft 20 and connecting rod 30, thereby damaging the sealing of the first needle roller bearing 70, causing the lubricating grease in the first needle roller bearing 70 to leak, reducing the reliability of the first needle roller bearing 70, and in severe cases, affecting the stable operation of the electric vacuum pump and reducing its reliability.

[0046] To address the aforementioned technical problems, this utility model provides an electric vacuum pump, comprising: an eccentric shaft 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; the connecting assembly includes a pin and a second needle roller bearing, the first end of the pin being connected to the distal end of the connecting rod, and the second end of the pin being connected to the piston, the second needle roller bearing being disposed between the second end of the pin and the piston. This technical solution utilizes a needle roller bearing instead of a bushing, resulting in a smaller gap between the pin and the second needle roller bearing, thereby improving the stability of the connection between the connecting rod, piston, and bushing. This improves the axial runout problem of the connecting rod, reducing the impact of connecting rod runout on the needle roller bearing at the eccentric portion, increasing the reliability of the needle roller bearing at the eccentric portion, improving the operational reliability of the electric vacuum pump, and reducing the noise during vacuum pump operation.

[0047] The electric vacuum pump of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments are not intended to limit the scope of protection of this utility model. Figure 3 A partial exploded view of an electric vacuum pump provided in an embodiment of the present invention is shown. Figure 4 A partial cross-sectional schematic diagram of an electric vacuum pump provided in an embodiment of the present invention is shown.

[0048] Figure 1 The vacuum pump shown in the prior art differs from this embodiment only in the connection component; the arrangement of the remaining components can be the same as in this embodiment. Therefore, the electric vacuum pump provided in this embodiment, except for the connection component, can refer to the following configuration for the other components. Figure 1 The relevant components will be explained and described. (Combined with...) Figure 1 , Figure 3 and Figure 4 Therefore, the electric vacuum pump provided in this embodiment of the present invention includes an eccentric shaft 20, a connecting rod 30, a piston 40, and a connecting assembly. Specifically, the eccentric shaft 20 includes at least one eccentric portion, and the proximal end of each connecting rod 30 is connected to an eccentric portion; the distal end of each connecting rod 30 is connected to a piston 40 through a connecting assembly; the connecting assembly includes a pin 50 and a second needle roller bearing 80, the first end of the pin 50 is connected to the distal end of the connecting rod 30, and the second end of the pin 50 is connected to the piston 40, and the second needle roller bearing 80 is disposed between the second end of the pin 50 and the piston 40.

[0049] By replacing the bushing 60' with the second needle roller bearing 80, the clearance between the pin 50 and the second needle roller bearing 80 is reduced, thereby improving the connection stability and reducing the clearance between the connecting rod 30, the piston 40, and the second needle roller bearing 80. This can improve the axial runout problem of the connecting rod 30, thereby reducing the impact of the runningout of the connecting rod 30 on the needle roller bearing at the eccentric part, improving the reliability of the needle roller bearing at the eccentric part, improving the reliability of the electric vacuum pump, and reducing the noise of the vacuum pump during operation.

[0050] For further information, please refer to [link / reference]. Figure 3 and Figure 4 The electric vacuum pump also includes a first gasket 91, disposed between the end of the second needle roller bearing 80 away from the connecting rod 30 and the pin 50. By placing the first gasket 91 between the pin 50 and the end of the second needle roller bearing 80 away from the connecting rod 30, direct contact between the second needle roller bearing 80 and the pin 50 is avoided. Furthermore, the first gasket 91 protects the second needle roller bearing 80 when it is pressed into the through hole of the piston 40 that accommodates the pin 50, reducing the difficulty of installing the second needle roller bearing 80 and improving installation efficiency.

[0051] Furthermore, such as Figure 3 and Figure 4 As shown, the electric vacuum pump also includes a second gasket 92, which is disposed between the end of the second needle roller bearing 80 near the connecting rod 30 and the connecting rod 30. By providing the second gasket 92 between the connecting rod 30 and the second needle roller bearing 80, a good buffering effect can be achieved, reducing the wear of the connecting rod 30 on the second needle roller bearing 80, reducing the noise of the compressor, and also providing a good stabilizing effect, improving the stability of the connection between the connecting rod 30 and the second needle roller bearing 80.

[0052] Furthermore, such as Figure 3 and Figure 4 As shown, the first gasket 91 has a first through hole 911 at its center, and the first end of the pin 50 passes through the first through hole 911. Furthermore, the first gasket 91 has an annular structure. The annular structure of the first gasket 91 is adapted to the through hole at the piston 40 that accommodates the pin 50, facilitating assembly, but the shape of the first gasket 91 is not limited to this.

[0053] Furthermore, such as Figure 3 and Figure 4 As shown, the second washer 92 has a second through hole 921 at its center, and the first end of the pin 50 passes through the second through hole 921. Furthermore, the second washer 92 has an annular structure. The annular structure of the second washer 92 is adapted to the through hole of the piston 40 that accommodates the pin 50, facilitating assembly, but the shape of the second washer 92 is not limited to this.

[0054] Furthermore, the electric vacuum pump also includes a first needle roller bearing 90, disposed between the proximal end of the connecting rod 30 and the eccentric shaft 20. The first needle roller bearing 90 enables the transmission of large radial torque, thus smoothly transferring the torque of the rotor 81 to the piston 40.

[0055] Furthermore, such as Figure 1 As shown, the electric vacuum pump in this embodiment includes two eccentric shafts 20 with eccentric portions, two connecting rods 30, two pistons 40, and two connecting assemblies. The two connecting rods 30 are positioned opposite each other at a distance of 180°, and the two pistons 40 are positioned opposite each other at a distance of 180°. In other embodiments, the number of eccentric portions, connecting rods 30, pistons 40, and connecting assemblies can be adjusted by those skilled in the art according to actual needs, and no specific limitation is made here.

[0056] Further, please refer to Figure 1 The electric vacuum pump also includes a motor and a rotating shaft 10. The motor drives the rotating shaft 10 to rotate, and the rotating shaft 10 is connected to the eccentric shaft 20. When the electric vacuum pump is running, the motor drives the rotating shaft 10 to rotate, the rotating shaft 10 drives the eccentric shaft 20 to rotate, the rotation of the eccentric shaft 20 drives the connecting rod 30 to swing, and the connecting rod 30 drives the piston 40 to reciprocate.

[0057] In summary, the electric vacuum pump provided by this utility model has the following advantages:

[0058] By replacing the bushing with a second needle roller bearing, the clearance between the pin and the second needle roller bearing is smaller, which improves the connection stability and reduces the clearance between the connecting rod, piston, and second needle roller bearing. This can improve the axial runout of the connecting rod, thereby reducing the impact of the connecting rod runout on the needle roller bearing at the eccentric part, improving the reliability of the needle roller bearing at the eccentric part, improving the reliability of the electric vacuum pump, and reducing the noise of the vacuum pump during operation.

[0059] 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: An eccentric shaft, having at least one eccentric part; Multiple links, each link having its proximal end connected to one of the eccentric portions; Multiple pistons and connecting assemblies, wherein the distal end of each of the connecting rods is connected to one of the pistons via one of the connecting assemblies; The connecting assembly includes a pin and a second needle roller bearing. The first end of the pin is connected to the distal end of the connecting rod, and the second end of the pin is connected to the piston. The second needle roller bearing is disposed between the second end of the pin and the piston.

2. The electric vacuum pump according to claim 1, characterized in that, It also includes a first washer disposed between the end of the second needle roller bearing opposite to the connecting rod and the pin.

3. The electric vacuum pump according to claim 1, characterized in that, It also includes a second washer disposed between the end of the second needle roller bearing near the connecting rod and the connecting rod.

4. The electric vacuum pump according to claim 2, characterized in that, The first washer has a first through hole at its center, and the first end of the pin passes through the first through hole.

5. The electric vacuum pump according to claim 4, characterized in that, The first gasket has a ring structure.

6. The electric vacuum pump according to claim 3, characterized in that, The second washer has a second through hole at its center, and the first end of the pin passes through the second through hole.

7. The electric vacuum pump according to claim 6, characterized in that, The second gasket has a ring structure.

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

9. The electric vacuum pump according to claim 1, characterized in that, The electric vacuum pump includes an eccentric shaft with two eccentric parts, two connecting rods, two pistons, and two connecting assemblies. The two connecting rods are positioned opposite each other at a distance of 180°, and the two pistons are positioned opposite each other at a distance of 180°.

10. The electric vacuum pump according to claim 1, characterized in that, It also includes a motor and a rotating shaft, the motor driving the rotating shaft to rotate, and the rotating shaft being connected to the eccentric shaft.

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