Connecting rod structure of electric vacuum pump and electric vacuum pump

Abstract

The utility model provides a connecting rod structure of an electric vacuum pump and the electric vacuum pump, the connecting rod structure of the electric vacuum pump comprises a connecting rod, the near end of the connecting rod is used for penetrating through a motor shaft, and the far end of the connecting rod is used for being connected with a piston; the pin comprises a pin rod, a neck part and a pin cap which are connected in sequence, and the pin rod is connected with the far end of the connecting rod; and the lining is sleeved on the periphery of the neck part. According to the connecting rod structure of the electric vacuum pump, clamping stagnation or abrasion caused by the fact that impurities enter a gap between the pin and the lining are prevented through matching of the pin and the lining, and the connecting rod structure has the advantages that manufacturing and assembling are easy, large axial force can be borne, and the pin is not prone to falling off when the connecting rod swings. The service life of the connecting rod structure is prolonged.

Description

Technical Field

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

[0002] The electric vacuum pump of a car generates vacuum by driving the piston movement through the motor and the motor shaft, which can improve the braking performance of the whole vehicle. In the current electric vacuum pump, the motor shaft and the piston are connected by a connecting rod structure. The connection between the connecting rod structure and the piston has the disadvantages of low strength, poor wear resistance, and short life. The development of a connecting rod structure that is easy to manufacture and assemble and can withstand large axial forces has become an urgent problem to be solved in this field.

[0003] 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 those skilled in the art. Utility Model Content

[0004] In view of the problems in the prior art, the purpose of the utility model is to provide a connecting rod structure of an electric vacuum pump and an electric vacuum pump. The connecting rod structure prevents impurities from entering the gap between the two and causing jamming or wear through the cooperation of a pin and a bushing. The connecting rod structure has the advantages of easy manufacturing and assembly and long service life.

[0005] The first aspect of the utility model provides a connecting rod structure of an electric vacuum pump, comprising:

[0006] A connecting rod, wherein the proximal end of the connecting rod is used to pass through the motor shaft, and the distal end of the connecting rod is used to connect to a piston;

[0007] A pin, comprising a pin rod, a neck and a pin cap connected in sequence, wherein the pin rod is connected to the distal end of the connecting rod;

[0008] A bushing is sleeved on the outer periphery of the neck.

[0009] According to the first aspect of the utility model, the bushing further includes an extension portion extending to one side of the nail cap.

[0010] According to the first aspect of the utility model, the connecting rod structure further includes a sealing unit, and the sealing unit is arranged at one end of the neck close to the nail rod.

[0011] According to the first aspect of the utility model, the sealing unit is a dust cover;

[0012] The dust cover comprises a bottom surface provided with a through hole and a side wall connected to the bottom surface;

[0013] The nail rod passes through the through hole and the dust cover is sleeved on the outer periphery of the neck close to one end of the nail rod.

[0014] According to the first aspect of the utility model, the outer peripheral wall of the bushing at the dust cover is a recessed wall recessed toward the center of the pin, and the side wall of the dust cover matches the recessed wall.

[0015] According to a first aspect of the utility model, the sealing unit is a sealing groove provided at the distal end of the connecting rod, and one end of the bushing is inserted and matched with the sealing groove.

[0016] According to the first aspect of the utility model, the nail rod is connected to the distal end of the connecting rod by interference fit; or

[0017] The bushing is clearance-fitted with the neck.

[0018] According to a first aspect of the utility model, the bushing is a sintered copper bushing.

[0019] According to a first aspect of the utility model, the bushing is a sintered copper bushing containing graphite.

[0020] A second aspect of the utility model provides an electric vacuum pump, comprising at least one connecting rod structure of the electric vacuum pump.

[0021] According to a second aspect of the utility model, the electric vacuum pump further comprises at least one piston;

[0022] Each of the bushings is connected to a piston rod of the piston by interference fit.

[0023] The connecting rod structure of the electric vacuum pump of the utility model prevents impurities from entering the gap between the two to cause jamming or wear, and has the advantages of being easy to manufacture and assemble, being able to withstand large axial forces, and the pin not being easy to fall off when the connecting rod swings. Furthermore, the bushing can adopt a sintered copper sleeve to increase the service life of the connecting rod structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other features, objectives and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings.

[0025] Figure 1 A schematic diagram of a connecting rod structure of an electric vacuum pump according to an embodiment of the utility model;

[0026] Figure 2 for Figure 1 The enlarged view of the dotted box;

[0027] Figure 3 A cross-sectional view of a dust cover according to an embodiment of the present invention;

[0028] Figure 4A partial cross-sectional view of a connecting rod structure of an electric vacuum pump according to another embodiment of the present invention; and

[0029] Figure 5 The figure is a schematic structural diagram of an electric vacuum pump according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that the utility model will be comprehensive and complete, and the concept of the example embodiments will be fully conveyed to those skilled in the art. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the utility model, and should not be construed as limitations on the utility model. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0031] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those skilled in the art may be aware of the application of other processes and / or the use of other materials.

[0034] In view of the existing technical problems, the utility model provides a connecting rod structure of an electric vacuum pump and an electric vacuum pump, wherein the connecting rod structure of the electric vacuum pump comprises: a connecting rod, wherein the proximal end of the connecting rod is used to penetrate the motor shaft, and the distal end of the connecting rod is used to connect a piston; a pin, comprising a nail rod, a neck and a nail cap connected in sequence, wherein the nail rod is connected to the distal end of the connecting rod; and a bushing, which is sleeved on the outer periphery of the neck. The connecting rod structure of the electric vacuum pump of the utility model prevents impurities from entering the gap between the pin and the bushing to cause jamming or wear, and has the advantages of being easy to manufacture and assemble, being able to withstand large axial forces, and the pin not being easy to fall off when the connecting rod swings. Furthermore, the bushing can be made of a sintered copper sleeve to increase the life of the connecting rod structure.

[0035] The connecting rod structure of the electric vacuum pump and the structure of the electric vacuum pump of the present utility model are further described below in conjunction with the accompanying drawings and specific embodiments. It can be understood that the various specific embodiments are not intended to limit the protection scope of the present utility model.

[0036] Figure 1 It is a schematic diagram of a connecting rod structure of an electric vacuum pump according to an embodiment of the present utility model. Specifically, the connecting rod structure of the electric vacuum pump includes a connecting rod 11 , a pin 12 and a bushing 13 .

[0037] The proximal end 111 of the connecting rod 11 is used to pass through the motor shaft, and the rotation of the motor shaft drives the rotation of the connecting rod. The distal end of the connecting rod 11 is used to connect a piston; the proximal end here refers to the end of the connecting rod 11 close to the motor shaft, and the distal end refers to the end of the connecting rod 11 relatively far away from the motor shaft. Usually, the proximal end 111 of the connecting rod 11 is connected to the motor shaft through a stud coaxially connected to the motor shaft. The motor shaft connected to the motor can smoothly drive the piston through the connecting rod 11 to reduce the vibration of the piston during operation.

[0038] Figure 2 Figure 1The enlarged view of the dotted frame of the pin 12 includes a nail rod 121, a neck 122 and a nail cap 123 connected in sequence, and the outer diameters of the nail rod 121, the neck 122 and the nail cap 123 increase in sequence. The nail rod 121 is connected to the distal end of the connecting rod 11; the nail rod 121 and the distal end of the connecting rod 11 can be connected by interference fit, that is, the distal end of the connecting rod 11 can be provided with a hole adapted to the nail rod 121, and the nail rod 121 is then assembled with the hole. The bushing 13 is sleeved on the outer periphery of the neck 122, and the bushing 13 can be a sintered copper sleeve, which has stronger wear resistance, thereby improving the life of the connecting rod structure and the electric vacuum pump using it. Preferably, the bushing can be a sintered copper bushing containing graphite. During sintering, an appropriate amount of graphite is evenly mixed into the copper powder to obtain a sintered copper bushing containing graphite. Since graphite has a flaky crystal structure, it has good lubrication performance and good wear resistance, pressure resistance and temperature resistance. Accordingly, the sintered copper bushing containing graphite is more wear-resistant and has a self-lubricating effect, making the electric vacuum pump less noisy and more stable during operation. There is a clearance fit between the bushing 13 and the neck. When the copper bushing is assembled, the mandrel can be used to press the neck 122 of the pin 12 into the mandrel to prevent excessive deformation.

[0039] In some embodiments, in order to reduce the impurities entering the gap between the bushing 13 and the pin 12, the bushing 13 also includes an extension 131 extending to one side of the nail cap 123. Further, the connecting rod structure also includes a sealing unit, which is arranged at one end of the neck 122 close to the nail rod 121. That is, the bushing of the utility model is sleeved on the middle part (neck 122) of the pin 12, and the extension 131 of the bushing 13 is used to prevent the impurities from entering the bushing 13 at the connection between the neck 122 and the nail cap 123. The sealing unit is arranged at one end of the neck 122 and the nail rod 121 to achieve sealing at the location. The above structure prevents impurities from entering the gap between the bushing 13 and the pin 12, thereby preventing the bushing 13 and the pin 12 from being stuck or worn. At the same time, the above connecting rod structure has a simple structure, and has the advantages of being easy to manufacture and assemble, being able to withstand large axial forces, and the pin not being easy to fall off when the connecting rod swings.

[0040] In one embodiment, the sealing unit is a dust cover 14, that is, the connecting rod structure further includes a dust cover 14. Figure 3 1 is a cross-sectional view of a dust cover of an embodiment of the present invention, wherein the dust cover 14 is sleeved on the outer periphery of the neck 122 near one end of the nail rod 121. The dust cover comprises a bottom surface 141 provided with a through hole h and a side wall 142 connected to the bottom surface 141; the nail rod 121 passes through the through hole h and the dust cover 14 is sleeved on the outer periphery of the neck 22 near one end of the nail rod 121. Figure 2As shown, at this time, the bottom surface 141 of the dust cover 14 abuts against the end surface of the connecting rod 11. In this embodiment, the outer peripheral wall of the bushing 13 at the dust cover 14 is a concave wall concave toward the center of the pin 12, and the side wall 142 of the dust cover 14 cooperates with the concave wall. The concave wall can make the side wall 142 of the dust cover 14 flush with the outer periphery of the rest of the dust cover 14, so as not to affect the connection between the bushing and the piston. The dust cover can be a steel cover.

[0041] Figure 4 This is a partial cross-sectional view of the connecting rod structure of an electric vacuum pump of another embodiment of the utility model. In this embodiment, the sealing unit is a sealing groove 112 provided at the distal end of the connecting rod 11, and one end of the bushing 13' is inserted into and matched with the sealing groove 112. The sealing groove 112 can also prevent impurities from entering the gap between the neck 122 and the bushing 13 from the connection between the neck 122 and the nail rod 121. The sealing unit is not limited to the structure of the above embodiment.

[0042] The second aspect of the utility model provides an electric vacuum pump, including at least one connecting rod structure of the electric vacuum pump. Of course, the electric vacuum pump also includes a motor, a motor shaft and multiple pistons. The number of pistons in the electric vacuum pump can be adjusted according to actual conditions. Figure 5 This is a schematic diagram of the structure of an electric vacuum pump according to an embodiment of the utility model, and the electric vacuum pump includes two connecting rod structures and two pistons 2. The motor shaft 3 of the electric vacuum pump is connected to the piston 2 through the connecting rod structure. More specifically, the motor shaft 3 is passed through the proximal end of each connecting rod 11, and the distal end of the connecting rod 11 is connected to a piston 2, that is, the pin rod 121 of the pin 12 is connected to the distal end of the connecting rod 11, the bushing 13 is sleeved on the neck 122 of the pin 12, and the piston rod of the piston 2 is sleeved on the bushing 13. Each bushing 13 and the piston rod of the piston 2 can be connected by interference fit, so as to maintain the connection strength between the two, so that the pin 12 and the bushing 13 are not easy to fall off, and the stability of the structure and operation of the electric vacuum pump is improved.

[0043] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present invention.

[0044] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A connecting rod structure of an electric vacuum pump, characterized in that: include: A connecting rod, wherein the proximal end of the connecting rod is used to pass through the motor shaft, and the distal end of the connecting rod is used to connect to a piston; A pin, comprising a pin rod, a neck and a pin cap connected in sequence, wherein the pin rod is connected to the distal end of the connecting rod; A bushing is sleeved on the outer periphery of the neck.

2. The connecting rod structure of the electric vacuum pump according to claim 1, characterized in that: The bushing also includes an extension portion extending to one side of the nail cap.

3. The connecting rod structure of the electric vacuum pump according to claim 1, characterized in that: The connecting rod structure further comprises a sealing unit, and the sealing unit is arranged at one end of the neck close to the nail rod.

4. The connecting rod structure of the electric vacuum pump according to claim 3, characterized in that: The sealing unit is a dust cover; The dust cover comprises a bottom surface provided with a through hole and a side wall connected to the bottom surface; The nail rod passes through the through hole and the dust cover is sleeved on the outer periphery of the neck close to one end of the nail rod.

5. The connecting rod structure of the electric vacuum pump according to claim 4, characterized in that: The outer peripheral wall of the bushing at the dust cover is a recessed wall recessed toward the center of the pin, and the side wall of the dust cover matches the recessed wall.

6. The connecting rod structure of the electric vacuum pump according to claim 3, characterized in that: The sealing unit is a sealing groove arranged at the distal end of the connecting rod, and one end of the bushing is inserted and matched with the sealing groove.

7. The connecting rod structure of the electric vacuum pump according to claim 1, characterized in that: The nail rod is connected to the distal end of the connecting rod by interference fit; or The bushing is clearance-fitted with the neck.

8. The connecting rod structure of the electric vacuum pump according to claim 1, characterized in that: The bushing is a sintered copper bushing.

9. The connecting rod structure of the electric vacuum pump according to claim 1, characterized in that: The bushing is a sintered copper bushing containing graphite.

10. An electric vacuum pump, characterized in that: A connecting rod structure comprising at least one electric vacuum pump according to any one of claims 1 to 9.

11. The electric vacuum pump according to claim 10, characterized in that The electric vacuum pump further comprises at least one piston; Each of the bushings is connected to a piston rod of the piston by interference fit.

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