CN220891007U - Crankshaft flexible connection structure and air compressor - Google Patents

Abstract

The utility model provides a crankshaft flexible connection structure and an air compressor, comprising a crankshaft body and a fan shaft; the crankshaft body is provided with a central hole suitable for sleeving the driving shaft and an eccentric shaft offset in the center Kong Cefang, and a buffer sleeve is sleeved on the eccentric shaft; the fan shaft is used for being rotatably connected to the wall of the crankcase and is coaxial with the central hole, one end of the fan shaft penetrates into the crankcase and is provided with an eccentric hole, and the eccentric hole is suitable for being embedded with the buffer sleeve; the outer peripheral wall of the buffer sleeve is closely attached to the hole wall of the eccentric hole based on the elastic strain amount. According to the crankshaft flexible connection structure and the air compressor, the buffer sleeve is arranged between the eccentric shaft and the eccentric hole, so that the requirements on machining and assembling position accuracy can be reduced, the assembling efficiency can be improved, and the service lives of the crankshaft body and the fan shaft can be prolonged.

Description

Crankshaft flexible connection structure and air compressor

Technical Field

The utility model belongs to the technical field of air compressors, and particularly relates to a crankshaft flexible connection structure and an air compressor.

Background

The air compressor for the vehicle is mainly used for providing a high-pressure air source for a vehicle braking system, a suspension system and other auxiliary systems. The air compressor can generate a large amount of heat in the process of compressing and doing work on gas, and in order to ensure the normal work of the compression cylinder and avoid the influence of high-temperature operation on the service life, the air compressor is required to be provided with a corresponding heat dissipation system. At present, the heat dissipation modes adopted according to the specific structure of the air compressor are mainly classified into water cooling heat dissipation, air cooling heat dissipation or a mode of combining water cooling and air cooling.

For the air compressor requiring air cooling and heat dissipation, a cooling fan is arranged on the outer side of a crankcase, the air flow of the cooling fan is led to a compression cylinder by utilizing a wind scooper to realize heat dissipation, a fan shaft of the cooling fan penetrates into the crankcase and is connected with a crankshaft to obtain rotary power, the fan shaft needs to be coaxial with the shaft end of a crankshaft connecting driving shaft in order to ensure the rotary stability of the cooling fan, the fan shaft needs to have extremely high connection position precision with the crankshaft, and in order to ensure the coaxiality between the fan shaft and the crankshaft, the fan shaft and the crankshaft are preassembled for coaxiality processing during assembly, and then the cooling fan is assembled into the crankcase.

Disclosure of utility model

The embodiment of the utility model provides a flexible connecting structure of a crankshaft and an air compressor, which aim to reduce the requirements on the machining and assembling precision of the crankshaft and improve the service life of the crankshaft.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: in a first aspect, a crankshaft flexible connection structure is provided, including a crankshaft body and a fan shaft; the crankshaft body is provided with a central hole suitable for sleeving the driving shaft and an eccentric shaft offset in the center Kong Cefang, and a buffer sleeve is sleeved on the eccentric shaft; the fan shaft is used for being rotatably connected to the wall of the crankcase and is coaxial with the central hole, one end of the fan shaft penetrates into the crankcase and is provided with an eccentric hole, and the eccentric hole is suitable for being embedded with the buffer sleeve; the outer peripheral wall of the buffer sleeve is closely attached to the hole wall of the eccentric hole based on the elastic strain amount.

With reference to the first aspect, in one possible implementation manner, the buffer sleeve includes a rigid inner sleeve and a rubber outer sleeve; wherein, the rigid inner sleeve is sleeved on the eccentric shaft and is in interference fit with the eccentric shaft; the rubber outer sleeve is sleeved on the rigid inner sleeve, is vulcanized and fixed with the outer peripheral wall of the rigid inner sleeve into a whole, is embedded in the eccentric hole and is in interference fit with the eccentric hole.

In some embodiments, the outer peripheral wall of the rubber jacket has a plurality of strain grooves circumferentially spaced apart.

The strain grooves extend, for example, parallel or obliquely in the axial direction of the eccentric shaft.

With reference to the first aspect, in a possible implementation manner, a radial extension plate is disposed on a peripheral wall of an end of the fan shaft penetrating into the crankcase, and the eccentric hole is disposed on the radial extension plate.

Illustratively, two radially extending plates are symmetrically distributed on the peripheral wall of the fan shaft, and eccentric holes are formed in the two radially extending plates.

In some embodiments, the crankshaft body includes a connecting disc and an eccentric shaft fixedly connected to one side of the connecting disc; the center of the connecting disc is provided with a center hole, and the edge of the connecting disc, which is close to the eccentric shaft, forms a thinning area.

Illustratively, the connecting disc is provided with a threaded hole which is communicated with the central hole along the radial direction of the central hole, and a jackscrew is screwed in the threaded hole.

The eccentric shaft comprises a first connecting section and a second connecting section, wherein one end of the first connecting section is fixedly connected with the connecting disc, and the other end of the first connecting section is connected with the second connecting section; the first connecting section is suitable for being connected with the piston connecting rod, the second connecting section is sleeved with a buffer sleeve, and the diameter of the second connecting section is smaller than that of the first connecting section.

The crankshaft flexible connection structure provided by the utility model has the beneficial effects that: compared with the prior art, the flexible connecting structure of the crankshaft has the advantages that the buffer sleeve is arranged between the eccentric shaft and the eccentric hole, and the position precision error between the eccentric shaft and the eccentric hole can be compensated by utilizing the elastic strain quantity of the buffer sleeve, so that the assembly coaxiality of the central hole and the fan shaft is ensured, the requirements on the machining and assembly position precision of the connecting part of the crankshaft and the fan shaft can be reduced, the assembly steps can be saved, and the assembly efficiency is improved; in addition, when the air compressor runs for a long time and the crankshaft body and/or the fan shaft is worn, the elastic strain quantity of the buffer sleeve can be used for realizing wear compensation, so that the fan shaft and the center hole can keep coaxial running, and the service lives of the crankshaft body and the fan shaft are prolonged.

In a second aspect, an embodiment of the present utility model further provides an air compressor, including the above crankshaft flexible connection structure.

Compared with the prior art, the air compressor provided by the embodiment of the utility model adopts the crankshaft flexible connecting structure, and the buffer sleeve is arranged between the eccentric shaft and the eccentric hole, so that the requirements on machining and assembling position accuracy can be reduced, the assembling efficiency can be improved, and the service lives of the crankshaft body and the fan shaft can be prolonged.

Drawings

FIG. 1 is a schematic diagram of an air compressor employing a flexible crankshaft connection structure provided by an embodiment of the present utility model;

FIG. 2 is a schematic cross-sectional view of a flexible connecting structure of a crankshaft according to an embodiment of the present utility model;

FIG. 3 is a schematic perspective view of a buffer sleeve according to an embodiment of the present utility model;

FIG. 4 is a schematic perspective view of a crankshaft body according to an embodiment of the present utility model;

Fig. 5 is a schematic perspective view of a fan shaft according to an embodiment of the present utility model.

In the figure: 10. a crankshaft body; 100. a central bore; 11. an eccentric shaft; 111. a first connection section; 112. a second connection section; 12. a connecting disc; 121. thinning the area; 122. a threaded hole; 123. a jackscrew; 20. a buffer sleeve; 21. a rigid inner sleeve; 22. a rubber jacket; 221. a strain tank; 30. a fan shaft; 300. an eccentric hole; 31. a radially extending plate; 40. a drive shaft; 50. a piston connecting rod; 60. and a crankcase.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or be indirectly on the other element. It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present invention. The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" or "a number" means two or more, unless specifically defined otherwise.

Referring to fig. 1 to 5, a description will be given of a flexible connecting structure for a crankshaft according to the present utility model. The crankshaft flexible connecting structure comprises a crankshaft body 10 and a fan shaft 30; the crankshaft body 10 is provided with a central hole 100 suitable for sleeving the driving shaft 40 and an eccentric shaft 11 offset to the side of the central hole 100, and a buffer sleeve 20 is sleeved on the eccentric shaft 11; the fan shaft 30 is rotatably connected to a wall of the crankcase 60 and is coaxial with the central hole 100, one end of the fan shaft 30 penetrates the crankcase 60 and is provided with an eccentric hole 300, and the eccentric hole 300 is suitable for embedding the buffer sleeve 20; wherein, the cushion cover 20 has an elastic strain amount of expansion or compression in a radial direction of the eccentric hole 300, and an outer circumferential wall of the cushion cover 20 closely fits with a wall of the eccentric hole 300 based on the elastic strain amount.

It should be noted that, the driving shaft 40 and the fan shaft 30 of the air compressor are respectively connected with two opposite walls of the crankcase 60 in a rotating way, so that the machining precision of the corresponding connecting hole on the crankcase 60 is ensured, that is, the central hole 100 matched with the driving shaft 40 and the fan shaft 30 connected with the crankcase 60 can be coaxial, and on the basis, the relative position precision between the eccentric shaft 11 and the central hole 100 and the relative position precision between the axis of the fan shaft 30 and the eccentric hole 300 determine whether the eccentric shaft 11 and the eccentric hole 300 can be connected smoothly; in this embodiment, the buffer sleeve 20 is sleeved on the eccentric shaft 11, and then the buffer sleeve 20 is ensured to be embedded in the eccentric hole 300 even if the eccentric shaft 11 and the eccentric hole 300 cannot be completely aligned by using the elastic strain amount of the buffer sleeve 20, so that the machining position precision between the eccentric shaft 11 and the central shaft and the machining position precision of the eccentric hole 300 on the fan shaft 30 can be reduced, and the coaxiality machining of the central hole 100 and the fan shaft 30 after preassembling the crankshaft body 10 and the fan shaft 30 is not required, thereby reducing the assembly procedure and improving the efficiency.

During the later use, various kinds of wear may occur to the crankshaft body 10 and the fan shaft 30, such as wear of the eccentric shaft 11 or wear of the eccentric hole 300, and compensation of the wear amount may be achieved by the elastic strain of the buffer sleeve 20, so that the buffer sleeve 20 can ensure connection reliability between the eccentric shaft 11 and the eccentric hole 300 and rotational stability of the fan shaft 30 as long as the wear amount does not exceed the elastic strain amount of the buffer sleeve 20.

Compared with the prior art, the crankshaft flexible connecting structure provided by the embodiment has the advantages that the buffer sleeve 20 is arranged between the eccentric shaft 11 and the eccentric hole 300, and the position precision error between the eccentric shaft 11 and the eccentric hole 300 can be compensated by utilizing the elastic strain quantity of the buffer sleeve 20, so that the assembly coaxiality of the central hole 100 and the fan shaft 30 is ensured, the requirements on the machining and assembly position precision of the connecting part of the crankshaft and the fan shaft 30 can be reduced, the assembly steps can be saved, and the assembly efficiency is improved; in addition, when the air compressor runs for a long time and the crankshaft body 10 and/or the fan shaft 30 is worn, the elastic strain quantity of the buffer sleeve 20 can be used for realizing wear compensation, so that the fan shaft 30 and the central hole 100 can keep coaxial running, and the service lives of the crankshaft body 10 and the fan shaft 30 are prolonged.

As a specific structural manner of the above-mentioned cushion cover 20, referring to fig. 3, the cushion cover 20 includes a rigid inner cover 21 and a rubber outer cover 22; wherein, the rigid inner sleeve 21 is sleeved on the eccentric shaft 11 and is in interference fit with the eccentric shaft 11; the rubber jacket 22 is sleeved on the rigid inner sleeve 21 and is vulcanized and fixed with the outer peripheral wall of the rigid inner sleeve 21 into a whole, and the rubber jacket 22 is embedded in the eccentric hole 300 and is in interference fit with the eccentric hole 300.

The reliable connection between the eccentric shaft 11 and the eccentric hole 300 is achieved by the interference fit of the rigid inner sleeve 21 and the eccentric shaft 11, and the interference fit of the rubber outer sleeve 22 and the eccentric hole 300, and the elastic deformability of the rubber outer sleeve 22 is utilized to perform the adaptive expansion or contraction (the expansion is understood as a process of recovering in the extrusion state herein), thereby counteracting the relative positional deviation between the eccentric shaft 11 and the eccentric hole 300.

Specifically, as shown in fig. 3, in this embodiment, a plurality of strain grooves 221 are formed in the outer peripheral wall of the rubber jacket 22 at intervals along the circumferential direction thereof. The elastic strain amount can be increased by forming the strain grooves 221, so that the adaptability of the buffer sleeve 20 to the position deviation between the eccentric shaft 11 and the eccentric hole 300 is improved, the processing position accuracy requirements of the eccentric shaft 11 and the eccentric hole 300 are further reduced, and the normal service lives of the crankshaft body 10 and the fan shaft 30 are prolonged.

Alternatively, the strain grooves 221 in this embodiment extend parallel or obliquely in the axial direction of the eccentric shaft 11. When the rubber jacket 22 is subjected to the circumferential pressing action, the portions between the strain grooves 221 can be collapsed toward the inside of the strain grooves 221, thereby realizing circumferential compression of the rubber jacket 22, and at the same time, the connection reliability of the eccentric shaft 11 and the eccentric hole 300 can be prevented from being affected by deformation of the rubber jacket 22 in the axial direction.

In some possible implementations, referring to fig. 2 and 5, a radially extending plate 31 is disposed on a peripheral wall of one end of the fan shaft 30 penetrating into the crankcase 60, and the eccentric hole 300 is disposed on the radially extending plate 31. The radial extension plate 31 can be welded and fixed on the fan shaft 30, or can be integrally formed with the fan shaft 30, and has a simple structure and is convenient to process.

As a modified structure of the fan shaft 30, referring to fig. 5, two radially extending plates 31 are symmetrically disposed on the peripheral wall of the fan shaft 30, and eccentric holes 300 are disposed on both radially extending plates 31. The adoption of two opposite extending radial extension plates 31 can ensure that the rotation center of gravity of the fan shaft 30 is at or close to the axis of the fan shaft 30, thereby improving the rotation stability of the fan shaft 30; in addition, each of the radially extending plates 31 is provided with an eccentric hole 300, and after one of the eccentric holes 300 is worn, the other eccentric hole 300 can be replaced to be connected with the eccentric shaft 11, so that the service life of the fan shaft 30 is prolonged, or the two eccentric holes 300 can be respectively provided with different eccentricities, for example, for a secondary air compressor, the eccentricities of the eccentric shafts 11 to which the two piston connecting rods 50 are required to be connected are different, and at this time, the fan shaft 30 can be commonly used and exchanged by providing two corresponding eccentric holes 300.

In some embodiments, the crankshaft body 10 is configured as shown in fig. 4. The crankshaft body 10 includes a connecting disc 12 and an eccentric shaft 11 fixedly connected to one side of the connecting disc 12; wherein the center of the connecting disc 12 is provided with a center hole 100, and the edge of the connecting disc 12 near the eccentric shaft 11 forms a thinned area 121. The position of the connecting disc 12 where the eccentric shaft 11 is provided causes the shift of the rotational center of gravity, and therefore, by thinning the position near the eccentric shaft 11, the rotational center of gravity can be readjusted to the axis of the center hole 100, the rotational stability of the crankshaft body 10 is ensured, and the operation vibration of the air compressor can be reduced.

It should be understood that in the present embodiment, as will be understood from fig. 2 and 4, the threaded hole 122 is provided in the connecting disc 12, the threaded hole 122 is penetrated through the central hole 100 in the radial direction of the central hole 100, and the jackscrew 123 is screwed into the threaded hole 122. The connecting disc 12 is directly sleeved on the driving shaft 40, and then the driving shaft 40 (the peripheral wall or a positioning hole/groove formed in the driving shaft 40) is radially jacked by the jackscrew 123, so that the reliable connection between the connecting disc 12 and the driving shaft 40 is realized, and the connection mode is simple and stable.

For example, referring to fig. 4, the eccentric shaft 11 includes a first connecting section 111 and a second connecting section 112, wherein one end of the first connecting section 111 is fixedly connected with the connecting disc 12, and the other end of the first connecting section 111 is connected with the second connecting section 112; the first connecting section 111 is suitable for connecting with the piston connecting rod 50, the second connecting section 112 is sleeved with the buffer sleeve 20, and the diameter of the second connecting section 112 is smaller than that of the first connecting section 111. The first connecting section 111 and the second connecting section 112 form a stepped shaft structure, so that the axial limit is formed by utilizing the step to face the piston connecting rod 50 and the buffer sleeve 20 conveniently, and the piston connecting rod 50 or the buffer sleeve 20 is prevented from axially moving; because the diameter of the second connecting section 112 is small, the piston connecting rod 50 can be conveniently assembled on the second connecting section 112 after being sleeved on the second connecting section 112, the assembling difficulty of the piston connecting rod 50 is reduced, and the assembling efficiency of the air compressor is improved.

Based on the same inventive concept, as will be appreciated with reference to fig. 1 to 5, the embodiment of the present application further provides an air compressor, which includes the above-mentioned crankshaft flexible connection structure.

Compared with the prior art, the air compressor provided by the embodiment realizes the flexible connection between the crankshaft body 10 and the fan shaft 30 by arranging the buffer sleeve 20 between the eccentric shaft 11 and the eccentric hole 300, so that the precision requirements of machining and assembling positions can be reduced, the assembling efficiency can be improved, and the service lives of the crankshaft body 10 and the fan shaft 30 can be prolonged.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (10)

1. Bent axle flexible coupling structure, its characterized in that includes:

the crankshaft body is provided with a central hole suitable for sleeving a driving shaft and an eccentric shaft which is offset in the center Kong Cefang, and a buffer sleeve is sleeved on the eccentric shaft;

The fan shaft is used for being rotatably connected to the wall of the crankcase and is coaxial with the central hole, one end of the fan shaft penetrates into the crankcase and is provided with an eccentric hole, and the eccentric hole is suitable for being embedded with the buffer sleeve;

The outer peripheral wall of the buffer sleeve is tightly attached to the hole wall of the eccentric hole based on the elastic strain amount.

2. The crankshaft flexible connection structure of claim 1, wherein the buffer sleeve comprises:

The rigid inner sleeve is sleeved on the eccentric shaft and is in interference fit with the eccentric shaft;

The rubber outer sleeve is sleeved on the rigid inner sleeve and is vulcanized and fixed with the outer peripheral wall of the rigid inner sleeve into a whole, and the rubber outer sleeve is embedded in the eccentric hole and is in interference fit with the eccentric hole.

3. The flexible connecting structure of crankshaft as claimed in claim 2, wherein the outer circumferential wall of the rubber jacket is provided with a plurality of strain grooves spaced apart along the circumferential direction thereof.

4. A crankshaft flexible connection structure as claimed in claim 3, wherein the strain grooves extend in parallel or obliquely in an axial direction of the eccentric shaft.

5. The flexible connecting structure of crankshaft as claimed in claim 1, wherein a radially extending plate is provided at a peripheral wall of an end of said fan shaft penetrating said crankcase, and said eccentric hole is provided at said radially extending plate.

6. The flexible connecting structure of claim 5, wherein two of said radially extending plates are symmetrically disposed on a peripheral wall of said fan shaft, and said eccentric holes are provided on both of said radially extending plates.

7. The crankshaft flexible connection structure as claimed in any one of claims 1 to 6, wherein the crankshaft body includes a connection disc and the eccentric shaft fixedly connected to one side of the connection disc; the center of the connecting disc is provided with the center hole, and the edge, close to the eccentric shaft, of the connecting disc forms a thinning area.

8. The flexible connecting structure of claim 7, wherein the connecting disc is provided with a threaded hole, the threaded hole is communicated with the central hole along the radial direction of the central hole, and a jackscrew is screwed in the threaded hole.

9. The crankshaft flexible connection structure as claimed in claim 7, wherein the eccentric shaft includes a first connection section and a second connection section, wherein one end of the first connection section is fixedly connected with the connection pad, and the other end of the first connection section is connected with the second connection section; the first connecting section is suitable for being connected with a piston connecting rod, the second connecting section is sleeved with the buffer sleeve, and the diameter of the second connecting section is smaller than that of the first connecting section.

10. Air compressor, characterized by comprising a crankshaft flexible connection structure according to any one of claims 1-9.