CN210531219U - Novel electronic water pump graphite bearing - Google Patents
Novel electronic water pump graphite bearing Download PDFInfo
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- CN210531219U CN210531219U CN201921503851.2U CN201921503851U CN210531219U CN 210531219 U CN210531219 U CN 210531219U CN 201921503851 U CN201921503851 U CN 201921503851U CN 210531219 U CN210531219 U CN 210531219U
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Abstract
The utility model discloses a novel electronic water pump graphite bearing, which comprises a graphite pipe, wherein the hollow interior of the graphite pipe is sequentially provided with a first cylindrical section, a second cylindrical section and a third cylindrical section; the axial centers of the first cylindrical section, the second cylindrical section and the third cylindrical section are coincident, and the diameters of the first cylindrical section and the third cylindrical section are larger than that of the second cylindrical section; the positioning step is circumferentially arranged on the outer wall of the graphite pipe corresponding to the third cylindrical section; the stainless steel sleeve is arranged on the outer wall of the graphite pipe corresponding to the second cylindrical section; the axial length of the stainless steel sleeve is consistent with that of the second cylindrical section, and the end face of one end, facing the positioning step, of the stainless steel sleeve is in contact with the positioning step. The utility model provides a novel electronic water pump graphite bearing enlarges the inboard diameter in graphite pipe both ends, increases nonrust steel bushing and location step, solves graphite bearing shrinkage deformation problem, has improved the product yield, has reduced manufacturing cost.
Description
Technical Field
The utility model relates to a bearing technical field especially relates to a novel electronic water pump graphite bearing.
Background
At present, a key component in an electronic water pump product, namely a graphite bearing, is manufactured into a graphite pipe by a mode of combining compression molding and finish machining by using a graphite material in the market. When the graphite pipe and a PPS material are subjected to rotor injection molding, the shrinkage deformation of an injection molded rotor and the cylindricity size of an inner hole of a graphite bearing are different due to the high temperature and high pressure of a mold, different materials and different shrinkage coefficients. The rotor is cracked and stuck under the high-low temperature alternative working state. On the other hand, the graphite bearing has higher requirements on PPS injection molding materials, the yield of batch production products is lower, and the production cost of the products is high.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an overcome the problem that prior art exists, provide a novel electronic water pump graphite bearing, enlarge the inboard diameter in graphite pipe both ends, increase nonrust steel bushing and location step, solve graphite bearing shrinkage deformation problem, improved the product yield, reduced manufacturing cost.
The utility model adopts the technical proposal that:
a graphite bearing of an electronic water pump comprises
The graphite tube is internally provided with a first cylindrical section, a second cylindrical section and a third cylindrical section in sequence; the axial centers of the first cylindrical section, the second cylindrical section and the third cylindrical section are coincident, and the diameters of the first cylindrical section and the third cylindrical section are larger than that of the second cylindrical section;
the positioning step is circumferentially arranged on the outer wall of the graphite pipe corresponding to the third cylindrical section; one surfaces of the positioning step and the third cylindrical section facing the center direction of the graphite tube are in the same plane;
the stainless steel sleeve is arranged on the outer wall of the graphite pipe corresponding to the second cylindrical section; the axial length of the stainless steel sleeve is consistent with that of the second cylindrical section, and the end face of one end, facing the positioning step, of the stainless steel sleeve is in contact with the positioning step.
Further, the positioning step is in a continuous or discontinuous ring shape.
Further, the positioning step and the graphite tube are integrally molded.
Further, the diameters of the first cylindrical section and the third cylindrical section are both 0.5% -5% larger than the diameter of the second cylindrical section.
Further, the stainless steel sleeve is arranged on the outer wall of the graphite pipe in an intermittent fit or interference fit mode.
Further, the outer diameter of the stainless steel sleeve is the same as that of the positioning step.
Further, the diameters of the first cylindrical section and the third cylindrical section are the same or different.
The utility model has the advantages that:
the utility model provides a novel electronic water pump graphite bearing adopts the integrated configuration of graphite pipe and nonrust steel bushing, has eliminated the expend with heat and contract with cold that temperature variation brought, has reduced injection moulding back rotor shrinkage deformation, has guaranteed the cylindricity size precision of graphite bearing hole, has avoided the card phenomenon of dying that appears under the high low temperature alternative operating condition. Meanwhile, the yield of finished products in batch production can be improved, the cost of the finished products is reduced, and the consistency of the product performance is ensured.
Moreover, in the combined structure of the graphite pipe and the stainless steel sleeve, the graphite pipe and the positioning step are in surface contact, so that the stress is uniform, stress-free concentration points are provided, and the stability of the product in the use process is greatly ensured.
Finally, in the combined structure of the graphite tube and the stainless steel sleeve, because the stainless steel sleeve only wraps the graphite tube part corresponding to the second cylindrical section, and the rest parts of the graphite tube, namely the graphite tube parts corresponding to the first cylindrical section and the second cylindrical section are not protected and supported, the phenomena of expansion with heat and contraction with cold are more obvious than the graphite tube part protected by the stainless steel sleeve, the diameters of the first cylindrical section and the third cylindrical section are larger than the second cylindrical section, namely the inner diameters of the two ends of the graphite tube are also larger than the inner diameter of the middle part after the two ends of the graphite tube are contracted, the requirement of the fit clearance with the shaft can be still met, and the phenomenon of clamping with the shaft can not occur.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a graphite bearing according to an embodiment of the present invention.
Fig. 2 is a front view of a graphite bearing according to an embodiment of the present invention.
Fig. 3 is a schematic sectional view along the direction of a-a in fig. 2.
Fig. 4 is a schematic structural diagram of a comparative sample 1 according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of comparative sample 2 according to an embodiment of the present invention.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention.
Embodiments of the present invention/utility model will be described in detail below with reference to the drawings.
The utility model discloses an embodiment, novel water pump graphite bearing, as shown in figure 1 ~ 3, including graphite pipe 1 and stainless steel cover 2.
Specifically, a continuous or discontinuous annular positioning step 11 is arranged on the circumferential outer wall of the end part close to one end of the graphite tube 1, the material of the positioning step 11 is the same as that of the graphite tube 1, and the positioning step 11 and the graphite tube 1 are integrally formed. The graphite tube 1 is hollow inside and comprises a first cylindrical section 12, a second cylindrical section 13 and a third cylindrical section 14. The positioning step 11 is positioned on the outer wall of the graphite tube 1 corresponding to the third cylindrical section 14, and one side of the positioning step 11 and the third cylindrical section 14 facing the center direction of the graphite tube 1, namely the transitional connecting surface of the second cylindrical section 12 and the third cylindrical section 13, is in the same plane. The axial centers of the first cylindrical section 12, the second cylindrical section 13 and the third cylindrical section 14 coincide, the diameters of the first cylindrical section 12 and the third cylindrical section 14 are the same or different and both are larger than the diameter of the second cylindrical section 13. Preferably, in order to ensure the strength of the two ends of the graphite tube 1, the diameter of the first cylindrical section 12 and the third cylindrical section 14 is 0.5 to 5 percent larger than that of the second cylindrical section 13.
The stainless steel sleeve 2 is in a circular tube shape and is arranged on the outer wall of the graphite tube 1 corresponding to the second cylindrical section 13 in an intermittent fit or interference fit mode. The outer diameter of the stainless steel sleeve 2 is consistent with that of the positioning step 11, and one end of the stainless steel sleeve facing the positioning step 11 is in contact with the positioning step 11. The axial length of the stainless steel sleeve 2 coincides with the axial length of the second cylindrical section 13.
Control sample 1 was graphite tube 1 alone as shown in figure 4. In comparative sample 2, graphite tube 1 was covered with stainless steel sleeve 2, and graphite tube 1 had the same inner diameter, as shown in FIG. 5. The graphite bearing of the present embodiment was subjected to a cooling test after being simultaneously subjected to a high temperature for 1h with the control sample 1 and the control sample 2, in which the inner diameters of the control sample 1 and the control sample 2, and the diameter of the second cylindrical section in the present embodiment were the same.
In the comparison sample 1, the diameter of the middle part of the graphite tube is reduced by 1.2% compared with the original size, the diameter of the two ends of the graphite tube is reduced by 1.0%, and the graphite tube is clamped with the shaft due to the fact that the whole inner diameter of the graphite tube is reduced.
In the comparison sample 2, the diameter of the middle part of the graphite tube is reduced by 0.2% compared with the original size, and the diameter of the two ends of the graphite tube is reduced by 1.0%, so that the graphite tube is clamped with the shaft due to the reduction of the inner diameters of the two ends of the graphite tube.
The diameter of the middle part of the graphite tube is reduced by 0.2 percent compared with the original size, the diameter of the two ends is reduced by 1.0 percent, the inner diameter of the reduced two ends is still larger than that of the middle part, and the phenomenon of locking is avoided.
The novel electronic water pump graphite bearing in the embodiment adopts the combined structure of the graphite pipe 1 and the stainless steel sleeve 2, eliminates thermal expansion and cold contraction caused by temperature change, reduces shrinkage deformation of a rotor after injection molding, ensures the cylindricity size precision of an inner hole of the graphite bearing, and avoids the phenomenon of blocking under the high-low temperature alternative working state. Meanwhile, the yield of finished products in batch production can be improved, the cost of the finished products is reduced, and the consistency of the product performance is ensured.
Furthermore, in the combined structure of the graphite tube 1 and the stainless steel sleeve 2, the graphite tube 1 is fragile, small in size, 5-8 mm in outer diameter and small in wall thickness. Any secondary operation such as trompil, tapping etc. all causes graphite pipe 1 to damage easily, consequently adopts location step 11 and graphite pipe 1 homogeneous integration shaping processing to form, can reduce its processing degree of difficulty, guarantees the quality of product simultaneously, also plays the limiting displacement to stainless steel cover 2. The assembly of the graphite bearing is completed after the stainless steel sleeve 2 is arranged on the graphite pipe 1, and no subsequent assembly process is needed. Meanwhile, the stainless steel sleeve 2, the graphite pipe 1 and the positioning step 11 are in surface contact, so that the stress is uniform, stress concentration points are avoided, and the stability of the product in the using process is greatly guaranteed.
Finally, in the combined structure of the graphite tube 1 and the stainless steel sleeve 2, because the stainless steel sleeve 2 only wraps the graphite tube 1 part corresponding to the second cylindrical section 13, and the rest parts of the graphite tube 1, namely the graphite tube 1 parts corresponding to the first cylindrical section 12 and the third cylindrical section 14, are not protected and supported, the phenomena of thermal expansion and cold contraction are more obvious than that of the graphite tube 1 part protected by the stainless steel sleeve 2, and the diameters of the first cylindrical section 12 and the third cylindrical section 14 are larger than that of the second cylindrical section 13, namely, the inner diameters of the two ends of the graphite tube 1 are also larger than that of the middle part even after the two ends are contracted, the requirement of the fit clearance with the shaft can be still met, and the phenomenon of clamping with the shaft cannot exist.
Claims (7)
1. Novel electronic water pump graphite bearing, its characterized in that: comprises that
The graphite tube is internally provided with a first cylindrical section, a second cylindrical section and a third cylindrical section in sequence; the axial centers of the first cylindrical section, the second cylindrical section and the third cylindrical section are coincident, and the diameters of the first cylindrical section and the third cylindrical section are larger than that of the second cylindrical section;
the positioning step is circumferentially arranged on the outer wall of the graphite pipe corresponding to the third cylindrical section; one surfaces of the positioning step and the third cylindrical section facing the center direction of the graphite tube are in the same plane;
the stainless steel sleeve is arranged on the outer wall of the graphite pipe corresponding to the second cylindrical section; the axial length of the stainless steel sleeve is consistent with that of the second cylindrical section, and the end face of one end, facing the positioning step, of the stainless steel sleeve is in contact with the positioning step.
2. The novel electronic water pump graphite bearing of claim 1, characterized in that: the positioning steps are continuous or discontinuous annular.
3. The novel electronic water pump graphite bearing of claim 1 or 2, characterized in that: the positioning step and the graphite tube are integrally molded in a homogeneous mode.
4. The novel electronic water pump graphite bearing of claim 3, characterized in that: the diameters of the first cylindrical section and the third cylindrical section are both 0.5-5% larger than the diameter of the second cylindrical section.
5. The novel electronic water pump graphite bearing of claim 1, 2 or 4, characterized in that: the stainless steel sleeve is arranged on the outer wall of the graphite tube in an intermittent fit or interference fit mode.
6. The novel electronic water pump graphite bearing of claim 1, 2 or 4, characterized in that: the outer diameter of the stainless steel sleeve is the same as that of the positioning step.
7. The novel electronic water pump graphite bearing of claim 1, 2 or 4, characterized in that: the first and third cylindrical sections may be the same or different in diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921503851.2U CN210531219U (en) | 2019-09-10 | 2019-09-10 | Novel electronic water pump graphite bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921503851.2U CN210531219U (en) | 2019-09-10 | 2019-09-10 | Novel electronic water pump graphite bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210531219U true CN210531219U (en) | 2020-05-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921503851.2U Active CN210531219U (en) | 2019-09-10 | 2019-09-10 | Novel electronic water pump graphite bearing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210531219U (en) |
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2019
- 2019-09-10 CN CN201921503851.2U patent/CN210531219U/en active Active
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