KR20210149331A - Method and structure for fixing the bearing - Google Patents

Abstract

The present invention relates to a structure and a method for fixating a bearing so as to prevent separation of the bearing by firmly supporting the bearing which is to be assembled into a plastic housing. The present invention provides a structure and a method for fixating a bearing, wherein the structure comprises: a housing having a bearing insertion groove formed at an end wherein the bearing insertion groove has an inner surface formed of a meltable material; a shaft assembled within the housing to be able to rotate; a bearing inserted into the bearing insertion groove in a shape of surrounding the shaft; and an end cap formed such that the maximum outer diameter is longer than the inner diameter of the bearing insertion groove, and allowing the inner surface of the bearing insertion groove to be pressed into the bearing insertion groove in a melted state and supporting the bearing such that the maximum outer diameter portion advances to the inner surface of the melted inner surface of the bearing insertion groove to be fused thereon.

Description

Method and structure for fixing the bearing

The present invention relates to a structure and method for fixing a bearing to prevent separation of the bearing by firmly supporting a bearing assembled in a plastic housing.

A vehicle's throttle valve is a device that controls the amount of intake air introduced into the engine cylinder through the throttle body, and a disk-shaped throttle plate is rotated around a rotating shaft to control the opening degree of the throttle valve.

Meanwhile, the shaft coupled to the throttle plate rotates while being inserted into the valve housing, and both ends of the shaft are supported by bearings to prevent the shaft from flowing.

At this time, the bearing is provided in the bearing insertion groove formed in the valve housing, and then the end cap is press-inserted into the bearing insertion groove to maintain airtightness.

This bearing fixing method is applicable to the case where the housing is made of a metal material. It prevents the bearing from being separated from the bearing insertion groove by press-inserting the bearing into the bearing insertion groove or assembling the bearing by hot or cold assembly method using thermal expansion. will prevent

However, when the housing is made of a plastic material, it is difficult to firmly fix the bearing in the bearing insertion groove because the physical properties such as dimensional accuracy, rigidity, and thermal expansion are inferior to the physical properties of the metal material due to the nature of the material, and the bearing may come off. There was a possible problem.

The matters described as the background art above are only for improving the understanding of the background of the present invention, and should not be accepted as acknowledging that they correspond to the prior art already known to those of ordinary skill in the art.

KR 20-0271390 Y1

The present invention has been devised to solve the problems described above, and it is an object of the present invention to provide a structure and method for fixing a bearing to prevent separation of the bearing by firmly supporting a bearing assembled in a plastic housing.

The configuration of the present invention for achieving the above object includes a housing having a bearing insertion groove formed at an end thereof, and an inner surface of the bearing insertion groove formed of a meltable material; a shaft rotatably assembled within the housing; a bearing inserted into the bearing insertion groove in a shape surrounding the shaft; and the maximum outer diameter is formed longer than the inner diameter of the bearing insertion groove, and while the inner surface of the bearing insertion groove is melted, it is press-fitted into the bearing insertion groove to support the bearing while the maximum outer diameter part enters the inner surface of the molten bearing insertion groove and is fused It may be characterized in that it includes an end cap.

The end cap has a circular support portion to support the bearing; The tension part is formed in an extended shape while being inclined in the axial direction at the edge of the support part; The bending angle of the tension part with respect to the support part may form an obtuse angle.

The center of the support is formed in a concave arc shape so that a ring-shaped support surface constituting the rim of the support is supported on the outer ring of the bearing; The outer fusion surface constituting the outer diameter of the tension part may be fused to the inner surface of the bearing insertion groove.

The outer diameter of the support surface may be formed in a shape corresponding to the inner diameter of the bearing insertion groove, so that the end cap may be press-fitted into the bearing insertion groove.

an outer diameter of the support surface is formed shorter than an inner diameter of the bearing insertion groove; The edge portion leading to the fusion surface from the support surface is formed in a chamfered shape, so that a filling space in which the melt is filled can be created between the chamfered surface and the bearing.

A locking projection is formed on the fusion surface to be fused to the inner surface of the bearing insertion groove.

A flat pressing surface is formed on the opposite surface of the support surface, so that the end cap press-fitting jig can be seated and pressed.

A wave spring may be assembled between the support and the bearing.

A method of fixing a bearing of the present invention, comprising: a jig heating step of heating the press-fitting jig at a high temperature; A cap press-in step of pressing the end cap into the bearing insertion groove using a press-fitting jig to support the end cap to the bearing; A cap fusion step in which the inner surface of the bearing insertion groove is melted by maintaining the state in which the end cap supports the bearing by the press-fitting jig for a certain period of time, so that the edge portion of the end cap is elastically restored to the outside and fused to the inner surface of the bearing insertion groove; It may be characterized in that it includes.

In the cap press-in step, the time required for press-fitting the end cap may be within a set time.

In the cap press-fitting step, high-temperature heat may be provided to the end cap through the press-fitting portion of the press-fitting jig supported by the end cap.

In the cap fusion step, the press-fitting jig is press-fitted into the end cap at a position close to the tension part to provide high-temperature heat to the tension part; The high-temperature heat provided to the tension part may be transferred to the inner surface of the bearing insertion groove in contact with the tension part, so that the inner surface of the bearing insertion groove may be melted.

Through the above-mentioned problem solving means, the present invention melts the inner surface of the bearing insertion groove while pressing the end cap into the bearing insertion groove using a press-fitting jig heated to a high temperature. It is fused to the inner surface to fix the end cap to the bearing insertion groove, thereby preventing separation of the bearing supported by the end cap.

1 is a view illustrating a state in which a bearing fixing structure according to the present invention is applied to a throttle valve.
Figure 2 is an enlarged view showing the configuration of the first embodiment for supporting the bearing according to the present invention by an end cap.
Figure 3 is a view showing the shape of the end cap of Figure 2;
Figure 4 is an enlarged view showing the configuration of the second embodiment for supporting the bearing according to the present invention by an end cap.
5 is a view showing a form in which a wave spring is provided between the bearing and the end cap in the present invention.
6 is a view showing the shape of another embodiment of the end cap according to the present invention.
7 is a view for explaining step by step a method of fixing the bearing using a press-fitting jig according to the present invention.

A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view illustrating a state in which a bearing 30 fixing structure according to the present invention is applied to a throttle valve, and FIG. 2 is a first embodiment in which a bearing 30 according to the present invention is supported by an end cap 40. Example It is a diagram showing an enlarged configuration.

Referring to the drawings, the throttle body 11 is formed in the housing 10 of the electronic throttle valve, and the shaft 20 is provided through the throttle body 11 in the radial direction.

And, a throttle plate 21 is coupled to the middle of the shaft 20, and the throttle plate 21 is rotatably provided inside the throttle body 11. The opening amount of the valve can be adjusted.

In addition, one end of the shaft 20 is fixed to the segment gear 2 constituting the actuator mechanism 1 to receive a driving force necessary for rotation of the shaft 20 , and to one end and the other end of the shaft 20 . The bearing 30 is coupled to prevent the shaft 20 from flowing.

On the other hand, a circular bearing insertion groove 12 is formed at the end of the housing 10 of the present invention. And, the inner surface of the bearing insertion groove 12 is formed of a material that can be melted by high temperature, preferably, the housing 10 is formed of a plastic material so that the inner surface of the bearing insertion groove 12 can be melted.

In addition, the shaft 20 is rotatably assembled inside the housing 10 , and the other end of the shaft 20 is located inside the bearing insertion groove 12 .

In addition, the bearing 30 which is inserted into the bearing insertion groove 12 in a shape surrounding the shaft 20 is inserted.

In addition, the end cap 40 is fitted into the bearing insertion groove 12 , and the maximum outer diameter of the end cap 40 is longer than the inner diameter of the bearing insertion groove 12 . Accordingly, in a state in which the inner wall surface of the bearing insertion groove 12 is melted, the end cap 40 is press-fitted into the bearing insertion groove 12 to support the bearing 30 and the maximum outer diameter portion of the end cap 40 is It enters into the inner surface of the molten and melted bearing insertion groove 12 to form a fusion-bonded structure.

At this time, the inner surface of the bearing insertion groove 12 can be heated and melted by a press-fitting jig 60 that can be heated to a high temperature, and the end cap 40 is inserted into the bearing insertion groove 12 by the press-fitting jig 60 The inner surface of the bearing insertion groove 12 is melted while press-fitting into the inner surface.

That is, when the end cap 40 is press-fitted into the bearing insertion groove 12 by using the press-fitting jig 60 heated to a high temperature, the end of the end cap 40 supports the bearing 30 and , in particular, the inner surface of the bearing insertion groove 12 in contact with the maximum outer diameter portion of the end cap 40 is melted while high-temperature heat is transferred to the maximum outer diameter portion of the end cap 40 . Accordingly, the end cap 40 should be formed of a material that has high thermal conductivity and can withstand high temperatures without melting.

Therefore, the maximum outer diameter portion of the end cap 40 enters the inner surface of the melted bearing insertion groove 12 and is fused, so that the end cap 40 does not fall out of the bearing insertion groove 12, and thus the end cap 40 ) is supported by the bearing 30 can also be firmly supported.

In addition, FIG. 3 is a view showing the shape of the end cap 40 applicable to the present invention. Referring to the configuration of the end cap 40 with reference to the drawings, the circular support part 41 is provided to support the bearing 30 . is formed, and the tension part 42 is bent obliquely in the axial direction at the edge of the support part 41 and is formed in an extended shape.

And, the bending angle of the tension part 42 with respect to the support part 41 is formed to form an obtuse angle, and preferably, it may be formed at an angle of about 100° or more.

For example, the free end 42c of the other end of the tension unit 42 around the fixed end 42b of one end of the tension unit 42 connected to the support unit 41 is expanded to the outside, and is formed in an open shape, the tension unit 42 ), the diameter of the free end 42c is the maximum outer diameter of the end cap 40 .

Therefore, when the end cap 40 is press-fitted into the bearing insertion groove 12, the free end 42c of the tension part 42 is moved inward with the fixed end 42b as the center due to the elasticity of the end cap 40. When the inner surface of the bearing insertion groove 12 is melted, the free end 42c of the tension portion 42 opens outward by the elastic restoring force of the tension portion 42, and the bearing insertion groove 12 is compressed. It enters the inner surface of the body and is fused and fixed.

In addition, as shown in FIG. 2 , in the present invention, the center of the support part 41 is formed in a concave arc shape, and the ring-shaped support surface 41a forming the rim of the support part 41 is the outer ring of the bearing 30 ( 31) is supported.

In addition, the outer fusion surface 42a constituting the outer diameter of the tension portion 42 is fused to the inner surface of the bearing insertion groove 12 .

That is, since the center of the support part 41 is concave, the edge portion of the support part 41 is supported by the bearing 30 , and the end cap 40 does not interfere with the inner race of the bearing 30 and the outer race 31 ) can only be supported.

In addition, when the end of the shaft 20 protrudes to the inside of the end cap 40 , the center of the end cap 40 is concave, so that the end of the shaft 20 is the center of the end cap 40 . to prevent interference with

And, the entire outer peripheral surface of the tension part 42 is fused to the inner surface of the bearing insertion groove 12, thereby increasing the fusion area to fix the end cap 40 more firmly, as well as through the end cap 40 confidentiality can be maintained.

In addition, in the case of the end cap 40 shown in Fig. 2, the outer diameter of the support surface 41a is formed in a shape corresponding to the inner diameter of the bearing insertion groove 12, so that the end cap 40 is inserted into the bearing insertion groove 12 ) is press-fitted into the structure.

That is, the edge of the support surface 41a is press-fitted into the inner surface of the bearing insertion groove 12, thereby firmly fixing the end cap 40 in the bearing insertion groove 12, and thus the end cap 40 and the bearing ( 30) is prevented.

Meanwhile, FIG. 4 is an enlarged view showing the configuration of the second embodiment in which the bearing 30 according to the present invention is supported by the end cap 40 .

In the case of the end cap 40 shown in FIG. 4 , the outer diameter of the support surface 41a is shorter than the inner diameter of the bearing insertion groove 12 .

And, the rim portion leading from the support surface 41a to the fusion surface 42a is formed in a chamfered shape, and a filling space 43a filled with the melt is formed between the chamfered slope 43 and the bearing 30. becomes a structure that becomes

That is, when the end cap 40 is press-fitted into the bearing insertion groove 12 , the bearing surface 41a is supported on the outer ring 31 of the bearing 30 and is in contact with the tension portion 42 of the bearing insertion groove 12 . The inside will melt.

Accordingly, as the bearing insertion groove 12 is melted, the molten material is filled in the filling space 43a and hardened, thereby supporting the outer ring 31 of the bearing 30 .

Accordingly, while the support surface 41a of the end cap 40 supports the bearing 30 , the melt solidified in the filling space 43a supports the bearing 30 together, thereby making the bearing 30 more reliable and stable. will be supported by

In addition, as shown in FIG. 4 , a plurality of hemispherical locking projections 44 are formed on the fusion surface 42a along the fusion surface 42a, and the locking projections 44 are located on the inner surface of the bearing insertion groove 12 . It becomes a fused structure.

That is, the locking projection 44 formed on the outer surface of the tension portion 42 enters the inner surface of the bearing insertion groove 12 together with the free end 42c of the tension portion 42 and is fused, whereby the end cap 40 is formed. The area fixed to the inner surface of the bearing insertion groove 12 is increased, thereby increasing the fixing force of the end cap 40 .

On the other hand, in the present invention, a flat pressing surface 45 is formed on the opposite surface of the support surface 41a, so that the end cap 40 press-fitting jig 60 is seated and pressed.

That is, referring to FIG. 7 , when inserting the end cap 40 into the bearing insertion groove 12 , the end cap 40 is press-inserted into the bearing insertion groove 12 using the press-fitting jig 60 , A flat pressing surface 45 is formed on the opposite surface of the support surface 41a so that the press-in portion 61 of the press-fitting jig 60 is seated and supported.

In particular, the press-in portion 61 of the press-fitting jig 60 is a portion that provides heat to the tension portion 42 by applying high-temperature heat, and the pressing surface 45 is formed close to the tension portion 42 . can

On the other hand, Figure 5 is a view showing a form in which the wave spring 50 is provided between the bearing 30 and the end cap 40 in the present invention, the wave spring between the support part 41 and the bearing 30 ( 50) can be further assembled.

That is, even in a state in which parts such as the wave spring 50 are further assembled between the bearing 30 and the end cap 40 , the end cap 40 can be fused and fixed in the bearing insertion groove 12 .

In addition, FIG. 6 is a view showing the shape of another embodiment of the end cap 40 according to the present invention, wherein the end cap 40 is formed of a plastic material and is formed in a shape to cover the inside and outside of the bearing insertion groove 12 . do.

Accordingly, the end cap 40 is fused to the outside of the bearing insertion groove 12 while supporting the outer ring 31 of the bearing 30 by the end cap 40 . In this case, for the fusion of the end cap 40, various fusion methods such as spin/ultrasound may be applied.

Meanwhile, FIG. 7 is a view for explaining step by step a method of fixing the bearing 30 according to the present invention using the press-fitting jig 60 .

Referring to the drawing, looking at the method of fixing the bearing 30 according to the present invention, first, in the jig heating step (S10), the press-fitting jig 60 is heated at a high temperature to complete the press-fitting preparation.

And, in the cap press-in step (S20), the end cap 40 is press-fitted into the bearing insertion groove 12 using the press-fitting jig 60 to support the end cap 40 to the bearing 30 .

At this time, the time required for press-fitting the end cap 40 is set within a set time, and the time for press-fitting the end cap 40 is performed within a fast time of, for example, 1 second, so that the end cap 40 ) in the process of being press-fitted, it is prevented from melting other parts before the end cap 40 reaches the target point.

Next, in the cap fusion step (S30), the end cap 40 supports the bearing 30 by the press-fitting jig 60 for a certain period of time, and the bearing insertion groove 12 by the row of the press-fitting jig 60 By melting the inner surface of the end cap 40, the edge portion is fused while entering the inner surface of the bearing insertion groove (12). In this case, the predetermined time may be approximately 5 seconds.

In addition, in the cap press-fitting step (S20), the press-fitting part 61 of the press-fitting jig 60 is press-fitted into the pressing surface 45 of the end cap 40, and the end cap ( 40) to provide high-temperature heat.

Accordingly, in the cap fusion step (S30), the press-fitting jig 60 is press-fitted into the end cap 40 at a position close to the tension part 42 to provide high-temperature heat to the tension part 42, and The high-temperature heat provided to the tension part 42 is transferred to the inner surface of the bearing insertion groove 12 in contact with the tension part 42 , so that the inner surface of the bearing insertion groove 12 can be melted.

That is, when the end cap 40 is press-fitted into the bearing insertion groove 12 by using the press-fitting jig 60 heated to a high temperature, the end of the end cap 40 supports the bearing 30 and , in particular, the inner surface of the bearing insertion groove 12 in contact with the maximum outer diameter portion of the end cap 40 is melted while high-temperature heat is transferred to the maximum outer diameter portion of the end cap 40 .

Therefore, the maximum outer diameter portion of the end cap 40 enters the inner surface of the melted bearing insertion groove 12 and is fused, so that the end cap 40 does not fall out of the bearing insertion groove 12, and thus the end cap 40 ) to firmly support the bearing 30 supported by the bearing 30 to prevent separation of the bearing 30 .

On the other hand, although the present invention has been described in detail only with respect to the specific examples described above, it is obvious to those skilled in the art that various modifications and variations are possible within the scope of the technical spirit of the present invention, and it is natural that such variations and modifications belong to the appended claims. .

10: housing
11: throttle body
12: bearing insertion groove
20: shaft
21: throttle plate
30: bearing
31: outer ring
40: end cap
41: support
41a: support surface
42: tension part
42a: fusion surface
42b: fixed end
42c: free end
43: pardon
43a: filling space
44: stumbling block
45: pressure side
50: wave spring
60: press-fitting jig
61: press-fitting part

Claims (12)

a housing having a bearing insertion groove formed at an end thereof, and an inner surface of the bearing insertion groove formed of a meltable material;
a shaft rotatably assembled within the housing;
a bearing inserted into the bearing insertion groove in a shape surrounding the shaft; and
The maximum outer diameter is formed longer than the inner diameter of the bearing insertion groove, and the inner surface of the bearing insertion groove is press-fitted into the bearing insertion groove in a molten state to support the bearing while the maximum outer diameter part enters the inner surface of the molten bearing insertion groove and fused End cap; fixed structure of the bearing including. The method according to claim 1,
The end cap is
A circular support portion is formed to support the bearing;
The tension part is formed in an extended shape while being inclined in the axial direction at the edge of the support part;
A fixing structure of a bearing, characterized in that the bending angle of the tension part with respect to the support part forms an obtuse angle. 3. The method according to claim 2,
The center of the support is formed in a concave arc shape so that a ring-shaped support surface constituting the rim of the support is supported on the outer ring of the bearing;
The fixing structure of the bearing, characterized in that the outer fusion surface constituting the outer diameter of the tension portion is fused to the inner surface of the bearing insertion groove. 4. The method according to claim 3,
The bearing fixing structure, characterized in that the outer diameter of the support surface is formed in a shape corresponding to the inner diameter of the bearing insertion groove, and the end cap is press-fitted into the bearing insertion groove. 4. The method according to claim 3,
an outer diameter of the support surface is formed shorter than an inner diameter of the bearing insertion groove;
The fixed structure of the bearing, characterized in that the rim portion leading to the fusion surface from the support surface is formed in a chamfered shape, so that a filling space filled with the melt is formed between the chamfered slope and the bearing. 4. The method according to claim 3,
The fixing structure of the bearing, characterized in that the locking projection is formed on the fusion surface to be fused to the inner surface of the bearing insertion groove. 4. The method according to claim 3,
A fixing structure of a bearing, characterized in that a flat pressing surface is formed on the opposite surface of the support surface, and the press-fitting jig for press-fitting the end cap is seated and pressed. 4. The method according to claim 3,
A fixing structure of a bearing, characterized in that a wave spring is assembled between the support and the bearing. As a method of fixing the bearing according to claim 1,
Jig heating step of heating the press-fitting jig at a high temperature;
a cap press-in step of pressing the end cap into the bearing insertion groove using a press-fitting jig to support the end cap to the bearing;
A cap fusion step in which the inner surface of the bearing insertion groove is melted by maintaining the state in which the end cap supports the bearing by the press-fitting jig for a certain period of time, so that the edge portion of the end cap enters the inner surface of the bearing insertion groove and is fused. How to fix bearings. 10. The method of claim 9,
In the cap press-fitting step, the fixing method of the bearing, characterized in that the time required for press-fitting the end cap is within a set time. 10. The method of claim 9,
In the cap press-fitting step,
A method of fixing a bearing, characterized in that the high-temperature heat is provided to the end cap through the press-fitting part of the press-fitting jig supported on the end cap. 10. The method of claim 9,
In the cap fusion step,
the press-fitting jig is press-fitted into the end cap at a position close to the tension unit to provide high-temperature heat to the tension unit;
The high-temperature heat provided to the tension part is transferred to the inner surface of the bearing insertion groove in contact with the tension part, and the inner surface of the bearing insertion groove is melted.

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