Electric vacuum pump

Abstract

The utility model provides an electric vacuum pump which comprises a rotating mechanism comprising a rotating shaft; the eccentric shafts are sequentially connected to the outer side of the rotating shaft, and the end faces of the adjacent eccentric shafts abut against each other; the near end of each connecting rod is connected with one eccentric shaft; the far end of each connecting rod is connected with one piston through one connecting assembly; the gasket is arranged on the outer side of the first end of the connecting assembly in a sleeving mode and arranged between the far end of the piston and the far end of the connecting rod. The gasket is additionally arranged between the connecting rod and the piston and can serve as a buffer layer to absorb vibration generated when the connecting rod swings, bear axial force generated when the connecting rod swings and transmit the axial force to the piston, noise generated when the electric vacuum pump works can be reduced, and the service life of the electric vacuum pump is prolonged. And the connecting rod is prevented from swinging to directly collide with the bushing, so that the bushing is separated from the mounting parts of the connecting rod and the piston and the electric vacuum pump fails.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum pumps, in particular to an electric vacuum pump. Background Art

[0002] Automobile braking systems include brake boosters that utilize engine intake manifold negative pressure to amplify braking force. In vehicles with electric or hybrid powertrains, where engine intake manifold negative pressure is sometimes unavailable, an electric vacuum pump is used to generate the negative pressure supplied to the brake booster.

[0003] Figure 1 A cross-sectional view of an electric vacuum pump in the prior art is shown; Figure 2 Shown Figure 1 Magnified image of the area indicated by the box. Figure 1 and Figure 2 It can be seen that the electric vacuum pump includes a rotating shaft 10, an eccentric shaft 20, a connecting rod 30, a piston 40, a pin 50 and a bushing 60, wherein the eccentric shaft 20 is sleeved on the outside of the rotating shaft 10, the proximal end of the connecting rod 30 is sleeved on the outside of the eccentric shaft 20, and the distal end of the connecting rod 30 and the distal end of the piston 40 are fixedly connected together by the pin 50 and the bushing 60. When the rotating shaft 10 rotates, it can drive the eccentric shaft 20 to rotate, and 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.

[0004] When the electric vacuum pump with the above-mentioned configuration is subjected to a durability test, the bushing 60 and the pin 50 may come out in a direction away from the piston 40, that is, the second end of the bushing 60 and the second end of the pin 50 are at a certain distance from the end surface of the piston 40 facing away from the connecting rod 30 (under normal circumstances, the distance between the second end of the bushing 60 and the second end of the pin 50 and the end surface of the piston 40 facing away from the connecting rod 30 is 0 mm), which will destroy the tightness of the connection between the connecting rod 30 and the piston 40, causing the electric vacuum pump to fail.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to ordinary technicians in this field. Utility Model Content

[0006] In view of the problems in the prior art, the purpose of the present utility model is to provide an electric vacuum pump to improve the reliability of the connection between the connecting rod and the piston, and to improve the operational reliability of the electric piston pump.

[0007] The present invention provides an electric vacuum pump, comprising:

[0008] A rotating mechanism including a rotating shaft;

[0009] A plurality of eccentric shafts are sequentially connected to the outside of the rotating shaft, wherein the end faces of adjacent eccentric shafts are in contact with each other;

[0010] a plurality of connecting rods, wherein the proximal end of each connecting rod is connected to one of the eccentric shafts;

[0011] A plurality of pistons and connecting assemblies, wherein the distal end of each connecting rod is connected to a piston via a connecting assembly;

[0012] A gasket is sleeved on the outer side of the first end of the connecting assembly and is arranged between the distal end of the piston and the distal end of the connecting rod.

[0013] In some embodiments, the electric vacuum pump includes two eccentric shafts, two connecting rods, two pistons and two connecting assemblies, the two connecting rods are in opposite positions 180° apart, and the two pistons are in opposite positions 180° apart.

[0014] In some embodiments, the connecting assembly includes a pin and a bushing, wherein a first end of the pin is connected to the distal end of the connecting rod and a second end is connected to the piston, and the bushing is disposed between the second end of the pin and the piston.

[0015] In some embodiments, a mounting groove is provided on a side of the piston close to the connecting rod, and the gasket is placed in the mounting groove.

[0016] In some embodiments, a gap is provided between the gasket and the bushing.

[0017] In some embodiments, the gasket is annular.

[0018] In some embodiments, the gasket is sleeved on the outside of the pin.

[0019] In some embodiments, at least one protrusion is provided on the circumference of the outer ring of the gasket.

[0020] In some embodiments, the spacer is a plastic spacer.

[0021] In some embodiments, the transmission system comprises two eccentric shafts.

[0022] In some embodiments, a needle bearing is further included, which is disposed between the first end of the connecting rod and the eccentric shaft.

[0023] The electric vacuum pump provided by the utility model has the following advantages:

[0024] By adding a gasket between the connecting rod and the piston, the gasket can act as a buffer layer to absorb the vibration generated when the connecting rod swings and withstand the axial force generated when the connecting rod swings, and transmit the axial force to the piston, which can reduce the noise generated when the electric vacuum pump is working, and avoid the connecting rod swinging directly colliding with the bushing, causing the bushing to fall out of the installation part of the connecting rod and piston, causing the electric vacuum pump to fail, thereby improving the connection stability of the connecting rod and the piston, and improving the reliability of the electric vacuum pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings.

[0026] Figure 1 is a cross-sectional view of an electric vacuum pump in the prior art;

[0027] Figure 2 yes Figure 1 A magnified view of the location indicated by the box;

[0028] Figure 3 This is a partial schematic diagram of an electric vacuum pump provided by an embodiment of the present utility model;

[0029] Figure 4 This is a partial exploded view of an electric vacuum pump provided by one embodiment of the present utility model;

[0030] Figure 5 This is a three-dimensional schematic diagram of a gasket provided in one embodiment of the present utility model;

[0031] Figure 6 This is a front view of a gasket provided by one embodiment of the utility model;

[0032] Figure 7 It is a side view of a gasket provided in one embodiment of the present utility model.

[0033] Reference numerals:

[0034] 10 rotating shafts 50 pins

[0035] 20 eccentric shaft 60 bushing

[0036] 30 connecting rod 70 gasket

[0037] 31 first mounting hole 71 third mounting hole

[0038] 40 piston 72 raised portion

[0039] 41 second mounting hole 80 motor

[0040] 42 mounting slot 81 rotor

[0041] 90 needle roller bearings DETAILED DESCRIPTION

[0042] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. In the figures, identical reference numerals denote identical or similar structures, and thus repetitive descriptions thereof will be omitted. The use of "or" or "alternative" in this specification may mean "and" or "or."

[0043] In the description of this application, reference to the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and integrate different embodiments or examples described in this application, as well as features of different embodiments or examples, unless otherwise contradictory.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include at least one such feature. In the context of this application, "plurality" means two or more, unless otherwise specifically defined.

[0045] To solve the problems in the prior art, the present invention provides an electric vacuum pump. The electric vacuum pump includes a rotating mechanism, including a rotating shaft; a plurality of eccentric shafts, which are sequentially connected to the outer side of the rotating shaft, wherein the end faces of adjacent eccentric shafts are in contact with each other; a plurality of connecting rods, the proximal end of each connecting rod being connected to an eccentric shaft; a plurality of pistons and connecting assemblies, the distal end of each connecting rod being connected to a piston via a connecting assembly; and a gasket, which is sleeved on the outer side of the first end of the connecting assembly and is arranged between the distal end of the piston and the distal end of the connecting rod. The present invention provides a gasket at the connection between the piston and the connecting rod. The gasket can serve as a buffer layer to absorb the vibration generated when the connecting rod swings and withstand the axial force generated when the connecting rod swings, and transmit the axial force to the piston. This can reduce the noise generated when the electric vacuum pump is working, and prevent the connecting rod from swinging and directly colliding with the bushing, causing the bushing to fall out of the installation position of the connecting rod and the piston, resulting in failure of the electric vacuum pump. This improves the stability of the connection between the connecting rod and the piston, and improves the reliability of the electric vacuum pump.

[0046] The electric vacuum pump of the present invention 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 the present invention.

[0047] Figure 3 A partial enlarged view of an electric vacuum pump provided by an embodiment of the present utility model is shown; Figure 4 A partial exploded view of an electric vacuum pump provided by an embodiment of the present invention is shown; Figures 1 to 4 It can be seen that the electric vacuum pump provided by the embodiment of the present utility model includes:

[0048] The rotating mechanism includes a rotating shaft 10;

[0049] A plurality of eccentric shafts 20 are sequentially connected to the outer side of the rotating shaft 10, wherein the end surfaces of adjacent eccentric shafts 20 are in contact with each other;

[0050] a plurality of connecting rods 30, wherein the proximal end of each connecting rod 30 is connected to an eccentric shaft 20;

[0051] A plurality of pistons 40 and connecting assemblies, wherein the distal end of each connecting rod 30 is connected to a piston 40 via a connecting assembly;

[0052] The gasket 70 is sleeved on the outside of the first end of the connecting assembly and is disposed between the distal end of the piston 40 and the distal end of the connecting rod 30 .

[0053] In the aforementioned electric vacuum pump, the rotating shaft 10 drives the eccentric shaft 20 to rotate, which in turn drives the connecting rod 30 to oscillate, and the connecting rod 30 drives the piston 40 to reciprocate. By adding a gasket 70 between the connecting rod 30 and the piston 40, the gasket 70 acts as a buffer layer to absorb vibrations caused by the swinging of the connecting rod 30, as well as to withstand the axial force generated by the swinging of the connecting rod 30 and transmit the axial force to the piston 40. This reduces the noise generated by the operation of the electric vacuum pump and prevents the axial force generated by the swinging of the connecting rod 30 from directly impacting the bushing 60 and causing the electric vacuum pump to fail. This improves the stability of the connection between the connecting rod 30 and the piston 40, thereby enhancing the reliability of the electric vacuum pump.

[0054] For details, please refer to Figure 1 and Figure 2 The electric vacuum pump in the embodiment of the present invention includes two eccentric shafts 20, two connecting rods 30, two pistons 40 and two connecting assemblies. The two connecting rods 30 are located at opposite positions 180 degrees apart, and the two pistons 40 are located at opposite positions 180 degrees apart. In other embodiments, the number of eccentric shafts 20 and pistons 40 in the electric vacuum pump can be adjusted by those skilled in the art according to actual conditions, and is not limited to Figure 1 and Figure 2 The quantity shown in .

[0055] Further, see Figure 3 and Figure 4 The connecting assembly includes a pin 50 and a bushing 60 , wherein a first end of the pin 50 is connected to the distal end of the connecting rod 30 and a second end is connected to the piston 40 , and the bushing 60 is disposed between the second end of the pin 50 and the piston 40 .

[0056] Specifically, such as Figure 4 As shown, the distal end of the connecting rod 30 is provided with a first mounting hole 31 extending along a first direction, the distal end of the piston 40 is provided with a second mounting hole 41 extending along the first direction, and the center of the gasket 70 is provided with a third mounting hole 71. The first direction here is the left-right direction as viewed from the front. When connecting the distal ends of the connecting rod 30 and the distal ends of the piston 40 together, the bushing 60 can be first placed into the interior of the second mounting hole 41 from the first side of the piston 40, and then the third mounting hole 71 of the gasket 70 can be aligned with the center of the second mounting hole 41 on the second side of the piston 40. Finally, the pin 50 can be inserted into the interior of the bushing 60 and extended into the first mounting hole 31 of the connecting rod 30 to fix the distal ends of the piston 40 and the connecting rod 30 together.

[0057] In a preferred embodiment, if Figure 3 As shown, a mounting groove 42 is provided on one side of the piston 40 close to the connecting rod 30, and the gasket 70 is placed in the mounting groove 42. By providing the mounting groove 42, the position of the gasket 70 is limited, and the convenience of installing the gasket 70 is achieved.

[0058] In some embodiments, as Figure 3 As shown, a gap d is provided between the washer 70 and the bushing 60. Providing the gap d between the washer 70 and the bushing 60 prevents the washer 70 from moving toward the bushing 60 when subjected to the axial force of the connecting rod 30, thereby preventing the bushing 60 from directly colliding with the bushing 60 and causing the bushing 60 to move away from the connecting rod 30, thereby ensuring a secure installation of the bushing 60.

[0059] Figure 5 A three-dimensional diagram of a gasket provided by an embodiment of the present invention is shown. Figure 6 and Figure 7 Shown respectively Figure 5 The front and side views of the gasket are shown. Figures 4 to 7 It can be seen that the gasket 70 is annular. When the gasket 70 is installed, the gasket 70 is sleeved on the outside of the first end of the pin 50 to fix the gasket 70 between the connecting rod 30 and the piston 40. The shape of the gasket 70 is not limited to the above-mentioned annular shape, and can also be other regular or irregular polygonal shapes, such as pentagons, hexagons, etc.

[0060] For further information, please refer to Figure 5 and Figure 6The outer circumference of the gasket 70 is provided with at least one raised portion 72, which extends in the axial direction away from the gasket 70. These raised portions 72 are used to fix the gasket 70 in the installation groove 32, preventing the gasket 70 from falling during installation, thereby improving the installation efficiency of the gasket 70 and improving the reliability of the gasket 70 assembly. Figure 5 The raised portions of the gasket 70 shown are evenly arranged on the outer circumference of the gasket 70, so that the force applied to each part of the gasket 70 when installed in the mounting groove 32 is evenly distributed, thereby improving the service life of the gasket. In other embodiments, the number of raised portions 72 and the arrangement on the outer circumference of the gasket 70 are not limited to Figure 5 Those skilled in the art can increase or decrease the number of the protrusions 72 and set the positions of the protrusions 72 on the outer ring of the gasket 70 according to actual needs.

[0061] In some embodiments, the gasket 70 is a plastic gasket. The gasket 70 made of plastic can absorb the noise generated when the connecting rod 30 swings, thereby reducing the noise when the electric vacuum pump is running.

[0062] For further details, please refer to Figure 1 The electric vacuum pump also includes a motor 80, which includes a rotor 81. The rotating shaft 10 is coaxially connected to the rotor 81. When the motor 80 is energized, the rotor 81 rotates around the motor axis, thereby driving the rotating shaft 10 to rotate.

[0063] In some embodiments, as Figure 2 As shown, the electric vacuum pump further includes a needle bearing 90, which is provided between the proximal end of the connecting rod 30 and the eccentric shaft 20. The needle bearing 90 can transmit a large radial torque so that the torque of the rotor 81 can be smoothly transmitted to the piston 40.

[0064] In summary, the electric vacuum pump provided by the utility model has the following advantages:

[0065] The utility model adds a gasket between the connecting rod and the piston. The gasket can serve as a buffer layer to absorb the vibration generated when the connecting rod swings and withstand the axial force generated when the connecting rod swings, and transmit the axial force to the piston. It can reduce the noise generated when the electric vacuum pump is working, and prevent the connecting rod from swinging and directly colliding with the bushing, causing the bushing and pin to fall out of the installation part of the connecting rod and the piston, making the connection between the connecting rod and the piston invalid, causing the electric vacuum pump to fail to work, thereby improving the stability of the connection between the connecting rod and the piston and improving the reliability of the electric vacuum pump.

[0066] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. An electric vacuum pump, characterized in that: include: A rotating mechanism including a rotating shaft; A plurality of eccentric shafts are sequentially connected to the outside of the rotating shaft, wherein the end faces of adjacent eccentric shafts are in contact with each other; A plurality of connecting rods, wherein the proximal end of each connecting rod is connected to one of the eccentric shafts; A plurality of pistons and connecting assemblies, wherein the distal end of each connecting rod is connected to a piston via a connecting assembly; A gasket is sleeved on the outer side of the first end of the connecting assembly and is arranged between the distal end of the piston and the distal end of the connecting rod.

2. The electric vacuum pump according to claim 1, characterized in that The electric vacuum pump includes two eccentric shafts, two connecting rods, two pistons and two connecting assemblies. The two connecting rods are located at opposite positions 180 degrees apart, and the two pistons are located at opposite positions 180 degrees apart.

3. The electric vacuum pump according to claim 1, wherein The connecting assembly includes a pin and a bushing, wherein a first end of the pin is connected to the distal end of the connecting rod and a second end is connected to the piston, and the bushing is arranged between the second end of the pin and the piston.

4. The electric vacuum pump according to claim 1, wherein A mounting groove is provided on one side of the piston close to the connecting rod, and the gasket is placed in the mounting groove.

5. The electric vacuum pump according to claim 3, characterized in that A gap is provided between the gasket and the bushing.

6. The electric vacuum pump according to claim 1, characterized in that The gasket is annular.

7. The electric vacuum pump according to claim 3, characterized in that The gasket is sleeved on the outer side of the pin.

8. The electric vacuum pump according to claim 6, characterized in that At least one protrusion is provided on the circumference of the outer ring of the gasket, and the protrusion extends away from the center of the gasket.

9. The electric vacuum pump according to claim 1, wherein The gasket is a plastic gasket.

10. The electric vacuum pump according to claim 1, wherein A needle bearing is also included and is disposed between the proximal end of the connecting rod and the eccentric shaft.

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