JP2020076347A - Impeller - Google Patents

Abstract

To improve durability of a bush in an impeller.SOLUTION: An impeller 1 includes an impeller main body 2 provided with a shaft hole 5 to insert a shaft member, a bush 3 disposed around the shaft hole 5 of the impeller main body 2, and an inner cylindrical member 4 disposed between the shaft member and the bush 3, and having an engagement portion 6 engaged with the shaft member and the bush 3 in a manner of being integrally rotated. The inner cylindrical member 4 is preferably caulked to the bush 3 in a state of being fitted to the shaft hole 5, for example, one end of the engagement portion 6 is bent in a radial outer direction of the shaft hole 5 and caulked to the bush 3.SELECTED DRAWING: Figure 2

Description

  The present invention relates to impellers.

  As an impeller used for a pump for outboard motors, inboard motors, and other equipment, an impeller body formed of an elastic member such as a rubber material and a cylindrical bush integrally provided around the shaft hole of the impeller body are used. The thing provided is mentioned (for example, refer patent document 1). Patent Document 1 describes that a metal bush having a key groove formed as an entrainment engaging portion is insert-molded on the impeller body.

Japanese Utility Model Publication No. 61-54999

  When torque is transmitted from the shaft member that is inserted into the shaft hole to the impeller body, stress due to strain tends to concentrate on the bushes on the side surface of the key groove. An object of the present invention is to improve the durability of a bush with a simple structure without requiring a large change in the shape of the bush in an impeller.

  In order to solve the above problems, the present invention provides an impeller body having a shaft hole through which a shaft member is formed, a bush provided around a shaft hole of the impeller body, and a shaft member and the bush. An inner cylinder member having an engaging portion that engages with the shaft member and the bush so as to rotate integrally with each other.

  According to the present invention, the inner cylinder member and the bush cooperate to increase the strength around the shaft hole. Since the rotational force of the shaft member is dispersed by the inner tubular member and then transmitted to the bush, concentration of stress on the bush-side engaging portion that engages with the inner tubular member is reduced. As a result, the bush can be made highly durable.

  Further, it is preferable that the inner cylindrical member is crimped to the bush while being fitted in the shaft hole.

  With this configuration, the bush and the inner tubular member are less likely to be displaced, and the concentration of stress on the bush-side engaging portion is further reduced.

  Further, it is preferable that one end of the engaging portion of the inner tubular member is bent outward in a radial direction of the shaft hole.

  With this configuration, one end of the engaging portion is bent outward in the radial direction of the shaft hole and is caulked, whereby workability of caulking work and strength around the engaging portion of the bush can be improved. ..

  Further, it is preferable that a housing space for housing one end of the bent engaging portion is formed at one end of the shaft hole.

  With this configuration, one end of the bent engaging portion can be housed in the housing space without interfering with the impeller body.

  Further, the bush has a linear engagement portion that extends radially inward and has a linear inner end, and the engagement portion includes a flat surface portion that engages with the inner end of the linear engagement portion. Is preferably provided.

  By doing so, the bushing and the inner cylinder member can be easily formed. Further, one end of the flat surface portion can be easily bent linearly along the inner end of the linear engagement portion, and the workability of the caulking work is improved.

  Further, the bush may have a key groove, and the engaging portion may be an engaging protrusion that engages with the key groove.

Further, it is preferable that the bush has a flange portion that extends radially inward and is in contact with the inner cylindrical member.
Further, it is preferable that the inner cylinder member has a stopper portion that extends radially outwardly and that is in contact with the bush and is in contact with an opening edge portion of the shaft hole.

  With this configuration, the inner cylinder member and the bush cooperate together to enhance the strength around the shaft hole.

  Further, it is preferable that both the bush and the inner cylinder member are press-formed products made of metal.

  By using both the bush and the inner cylinder member as press-formed products made of metal, it is possible to improve the strength of the bush and the inner cylinder member and to reduce the cost as compared with the cutting process.

  According to the impeller of the present invention, the bush can be made highly durable.

It is a top view of the impeller which concerns on 1st Embodiment. It is a cross-sectional perspective view of the impeller according to the first embodiment, and shows a state before the inner cylinder member is caulked. It is an external appearance perspective view of the bush of 1st Embodiment. It is an appearance perspective view of an inner cylinder member of a 1st embodiment. It is a sectional side view of the swaging part circumference of 1st Embodiment. It is a top view of the impeller concerning a 2nd embodiment. It is an external appearance perspective view of the bush of 2nd Embodiment. It is an external appearance perspective view of the inner cylinder member of 2nd Embodiment. It is the cross-sectional perspective view which looked at the impeller which concerns on 3rd Embodiment from the axial direction one end side, and shows the state before inserting an inner cylinder member. It is the cross-sectional perspective view which looked at the impeller which concerns on 3rd Embodiment from the axial other end side, and shows the state before inserting an inner cylinder member. It is the cross-sectional perspective view which looked at the impeller which concerns on 3rd Embodiment from the axial direction one end side, and shows the state which inserted the inner cylinder member. It is the cross-sectional perspective view which looked at the impeller which concerns on 3rd Embodiment from the axial other end side, and shows the state which inserted the inner cylinder member. FIG. 13 is a sectional view taken along line XIII-XIII in FIG. 12. It is an external appearance perspective view of the bush of 3rd Embodiment. It is an external appearance perspective view of the inner cylinder member of 3rd Embodiment.

  As shown in FIGS. 1 and 2, the impeller 1 includes an impeller body 2 having a shaft hole 5 through which the shaft member 30 passes, a bush 3, and an inner cylinder member 4. The impeller 1 is used, for example, in a water pump for pumping seawater as cooling water for cooling the engine of an outboard motor, a water pump for an inboard motor, a general-purpose pump for industrial machinery, and the like.

  The impeller body 2 includes a cylindrical base portion 2A having a shaft hole 5 centered on the axis O of the shaft member 30 and a plurality of blade portions 2B radially extending radially outward from the base portion 2A. , And these are integrally formed of an elastic material such as a rubber material.

  The bush 3 is integrally formed around the shaft hole 5 of the impeller body 2. The bush 3 enhances the strength around the shaft hole 5, suppresses excessive elastic deformation around the shaft hole 5 when torque is transmitted from the shaft member 30 to the impeller body 2, and prevents the impeller body 2 from being damaged. Improve. The inner cylinder member 4 is a member provided between the shaft member 30 and the bush 3, and the engaging portion 6 transmits torque from the shaft member 30 to the bush 3, that is, the impeller body 2.

  The inner cylinder member 4 cooperates with the bush 3 to increase the strength around the shaft hole 5. The rotational force of the shaft member 30 is transmitted to the bush 3 after being dispersed by the inner tubular member 4, so that the stress applied to the engaging portion 6 on the bush 3 side that engages with the engaging portion 6 of the inner tubular member 4. Concentration is reduced. As a result, the bush 3 can be made highly durable.

  By crimping the bushing 3 with the inner cylinder member 4 fitted in the shaft hole 5, the bush 3 and the inner cylinder member 4 are less likely to be displaced, and the stress is not concentrated on the engaging portion on the bush 3 side. It is further reduced. Further, if one end of the engaging portion 6 is bent outward in the radial direction of the shaft hole 5 and the inner tubular member 4 is caulked to the bush 3, workability of caulking work is improved and the engagement portion around the bush 3 is surrounded. It is possible to achieve both improvement in strength.

Hereinafter, three embodiments will be described in detail.
"First embodiment"
With reference to FIGS. 1 to 3, the bush 3 has a cylindrical body portion 3A having a shaft center O as a cylinder axis and having a length extending in the vicinity of both ends of the shaft hole 5, and from one end of the body portion 3A. And a flange portion 3B extending in the radial direction. The bush 3 is formed of a metal material such as stainless steel, is arranged around the shaft hole 5 of the base 2A, and is integrally molded with the impeller body 2 by insert molding, as shown in FIG. The bush 3 is made of, for example, a pressed product of stainless steel. The inner end 3C of the flange portion 3B of the bush 3 is located on one end side of the shaft hole 5 so as to be flush with the inner surface of the shaft hole 5. As shown in FIG. 3, the body portion 3A is formed with a plurality of through holes 3D for allowing the elastic material to flow in and out of the body portion 3A when the impeller body 2 is molded.

  A linear engagement portion 7 is formed at one end of the collar portion 3B, the linear engagement portion 7 extending radially inward and having a linear inner end. That is, when viewed in the direction of the axis O, the linear engagement portion 7 extends radially inward from the extension circumferential line 3E (shown by a virtual line in FIG. 3) of the inner end 3C of the collar portion 3B, The end 3C is linearly formed. In the following description, the linear inner end of the linear engagement portion 7 will be referred to as the D cut portion 8.

  As shown in FIGS. 2 and 5, on the inner surface of the shaft hole 5, a rectangular flat surface that is continuous in a plane is formed from the D cut portion 8 to the other end side of the shaft hole 5. This plane is referred to as a D-cut shaft hole surface 9. On the other hand, the inner surface of the shaft hole 5 located at one end side (upper side in FIGS. 2 and 5) of the D-cut portion 8 is not flush with the D-cut portion 8 and has a diameter larger than that of the D-cut portion 8. The stepped surface 10 extends parallel to the D-cut portion 8 at the outer position. As a result, an accommodation space 11 for accommodating the bent portion of the inner cylinder member 4 described later is formed inside the step surface 10.

  Referring also to FIG. 4, the inner tubular member 4 is a metallic tubular member that is fitted into the axial hole 5 of the impeller body 2, and is made of, for example, a pressed product of stainless steel. As the engaging portion 6, a rectangular flat surface portion 12 that engages with the D-cut portion 8 and the D-cut shaft hole surface 9 is formed on the outer periphery of the inner cylindrical member 4. A shaft member 30 having a flat surface that engages with the flat surface portion 12 is inserted into the inner cylindrical member 4. As a result, the shaft member 30 and the bush 3 rotate together due to the engagement in the flat surface portion 12, and torque is transmitted from the shaft member 30 to the impeller body 2. A flange-shaped stopper portion 4A extending radially outward is formed on the other end side of the inner cylindrical member 4. The inner cylinder member 4 is inserted into the shaft hole 5 from the other end side of the shaft hole 5, and the stopper portion 4A abuts around the other end opening of the shaft hole 5, whereby the inner cylinder member 4 is positioned in the axis O direction. The inner end 3C of the collar portion 3B contacts the outer peripheral surface of the inner tubular member 4.

  As shown in FIG. 2, when the stopper portion 4A is in contact with the opening around the other end of the shaft hole 5, one end of the inner tubular member 4 projects outward in the axial center O direction from the collar portion 3B of the bush 3. It is in a state. Then, as shown in FIG. 5, one end of the flat surface portion 12 of the inner tubular member 4 is linearly bent radially outward along the D-cut portion 8 from the state shown by the imaginary line to the solid line. As a result, the inner cylinder member 4 is swaged to the D-cut portion 8 of the bush 3 and integrated with the bush 3. One end of the bent inner cylinder member 4 is housed in the housing space 11.

  According to the present embodiment, since one end of the flat surface portion 12 of the inner tubular member 4 is caulked to the D cut portion 8, the bush 3 and the inner tubular member 4 are less likely to be displaced, and stress is less likely to be concentrated. Further, since the rotational force of the shaft member 30 is dispersed by the inner cylinder member 4 and then transmitted to the bush 3, stress concentration on the D-cut portion 8 is reduced. As a result, the bush 3 can be made highly durable.

  As in the present embodiment, if the bush 3 is provided with the linear engagement portion 7 and the engagement portion 6 of the inner tubular member 4 is the flat surface portion 12 that engages with the inner end of the linear engagement portion 7, the bush 3 is formed. And the forming process of the inner cylinder member 4 can be easily performed. In particular, if both the bush 3 and the inner cylinder member 4 are made of a pressed metal product, the pressing work can be performed accurately with a simple press die structure, and the cost can be reduced as compared with the cutting work. it can. Further, according to the present embodiment, one end of the flat surface portion 12 can be easily bent linearly along the inner end of the linear engagement portion 7, and the workability of the caulking work is improved.

  In addition, although the effect of improving the strength of the bush 3 can be expected by making only the D-cut portion 8 as the crimping range, in some cases, it may be applied to the circumferential portion of the collar portion 3B other than the D-cut portion 8. Good. Alternatively, the D-cut portion 8 may not be swaged, but only the circumferential portion of the collar portion 3B may be swaged.

  Further, in the present embodiment, since the bush 3 has the flange portion 3B that extends in the radially inward direction and is in contact with the inner tubular member 4, the inner tubular member 4 and the bush 3 are integrated, and the bushing 3 around the shaft hole 5 is provided. Strength is increased.

"Second embodiment"
The second embodiment will be described with reference to FIGS. 6 to 8. In the impeller 1A according to the second embodiment, a key groove 21 is formed in the bush 3, and the engaging portion 6 of the inner tubular member 4 is composed of an engaging protrusion 22 that engages with the key groove 21. Main features Generally, when the rotational torque of the shaft member is large, a key groove structure is often used as the accompanying engaging portion. The components other than the key groove 21 and the engaging protrusion 22 are the same as those in the first embodiment, and therefore, the same reference numerals are given and the description thereof is omitted.

  6 and 7, a key groove 21 having a rectangular shape when viewed from the direction of the axis O is formed in the collar portion 3B of the bush 3 as an engaged portion that engages with the engaging portion 6. On the inner surface of the shaft hole of the impeller body 2, a key groove that is flush with the key groove 21 is formed. As shown in FIG. 8, an engagement protrusion 22 that engages with the key groove 21 of the bush 3 and the key groove of the shaft hole of the impeller body 2 is formed on the outer periphery of the inner cylinder member 4. A key (not shown) attached to a shaft member (not shown) engages with the inside of the engagement protrusion 22.

  Similar to the first embodiment, a flange-shaped stopper portion 4A extending radially outward is formed on the other end side of the cylindrical member 4. The inner cylinder member 4 is inserted into the shaft hole 5 (not shown) from the other end side of the shaft hole 5, and the stopper portion 4A abuts around the other end opening of the shaft hole 5, so that the inner cylinder member 4 is positioned in the axis O direction. .. The inner end 3C of the collar portion 3B of the bush 3 contacts the outer peripheral surface of the inner tubular member 4, as shown in FIG. When the stopper portion 4A is in contact with the opening around the other end of the shaft hole 5, one end of the inner tubular member 4 is in a state of protruding outward from the flange portion 3B of the bush 3 in the axial center O direction.

  Also according to this embodiment, the inner cylindrical member 4 can be easily crimped to the key groove 21 of the bush 3 by bending one end of the engaging protrusion 22 in the radial direction of the shaft hole. One end of the bent engaging protrusion 22 is housed in the housing space 11 as in the case of FIG. The type of the key is not particularly limited, such as the sunken key and the flat key.

  Even with the structure using the key groove as in the present embodiment, by crimping one end of the engaging protrusion 22 of the inner tubular member 4 to the key groove 21, the bush 3 and the inner tubular member 4 are surrounded by the key groove 21. Misalignment is less likely to occur, and stress is less likely to concentrate. Since the rotational force of the shaft member is dispersed by the inner cylindrical member 4 and then transmitted to the bush 3, stress concentration on the key groove 21 is reduced. As a result, the bush 3 can be made highly durable.

  Further, since the bush 3 has the flange portion 3B that extends in the radial direction and contacts the inner tubular member 4, the inner tubular member 4 and the bush 3 are integrated, and the strength around the shaft hole 5 is further increased.

"Third Embodiment"
The third embodiment will be described with reference to FIGS. 9 to 15. The impeller 1B according to the third embodiment relates to a structure in which the cylindrical member is not caulked to the bush.

  As shown in FIG. 11, the impeller 1B includes an impeller body 32, a bush 33, and an inner cylinder member 34. In FIG. 9, the impeller body 32 includes a cylindrical base portion 32A and a plurality of blade portions 32B radially extending from the base portion 32A in a radially outward direction. A shaft hole 35, through which a shaft member (not shown) is inserted, is formed in the base portion 32A.

  A star-shaped shaft hole surface 35A having a substantially star-shaped polygonal cross-sectional shape is formed in the axial center of the shaft hole 35. A first shaft hole surface 35B having a larger diameter than the star shaft hole surface 35A and a second shaft hole surface 35C having a larger diameter than the first shaft hole surface 35B are sequentially arranged from the star shaft hole surface 35A to one end side. Has been formed. A third shaft hole surface 35D having a larger diameter than the star shaft hole surface 35A and a fourth shaft hole surface 35E having a larger diameter than the third shaft hole surface 35D are arranged in this order from the star shaft surface 35A. Are formed.

  A step portion is formed between the star-shaped shaft hole surface 35A and the first shaft hole surface 35B, and the inner edge of the collar 33B of the bush 33, which will be described later, is exposed at this step. It is arranged. On the other hand, as shown in FIG. 10, a step surface 40 formed by the impeller body 32 is formed as an opening edge portion of the shaft hole 35 between the star-shaped shaft hole surface 35A and the third shaft hole surface 35D. A stopper portion 34A of an inner cylinder member 34, which will be described later, contacts the step surface 40.

  As shown in FIG. 14, the bush 33 includes a body portion 33A having a shaft center O as a cylinder axis, and a flange portion 33B extending from one end of the body portion 33A in the radial direction. The body portion 33A is formed with a plurality of through holes 33D for allowing the elastic material to flow in and out of the body portion 33A when the impeller body 32 is molded. As shown in FIG. 13, the body 33A has a substantially star-shaped polygonal cross section in which corrugated irregularities are alternately formed in the circumferential direction, as shown in FIG.

  In FIG. 9, the inner end 33C of the collar portion 33B has a substantially star-shaped polygonal shape having the same shape as the star-shaped shaft hole surface 35A of the impeller body 32. The bush 33 is formed of a metal material such as stainless steel, is arranged around the shaft hole 35, and is integrally molded with the impeller body 32 by insert molding, as shown in FIG. The bush 33 is made of, for example, a pressed product of stainless steel. The inner end 33C of the collar portion 33B is positioned so as to be flush with one end of the star-shaped shaft hole surface 35A.

  In FIG. 15, the inner tubular member 34 is a tubular member made of metal, and is made of, for example, a pressed product of stainless steel. The inner cylindrical member 34 has, as the engaging portion 36, a substantially star-shaped polygonal cross-sectional shape that follows the shapes of the inner end 33C of the collar portion 33B and the star-shaped shaft hole surface 35A. A shaft member having a substantially star-shaped polygonal cross-sectional shape is inserted into the inner cylindrical member 34. As a result, the shaft member and the bush 33 rotate together due to the substantially star-shaped polygonal engagement, and torque is transmitted from the shaft member to the impeller body 32. A flange-shaped stopper portion 34A extending radially outward is formed on the other end side of the inner tubular member 34. The inner cylinder member 34 is inserted into the shaft hole 35 from the other end side of the shaft hole 35, and as shown in FIGS. 11 and 12, when the stopper portion 34A abuts the step surface 40, the inner cylinder member 34 moves in the O axis direction. Positioned. As shown in FIG. 13, since the outer peripheral surface of the stopper portion 34A is formed in a substantially star-shaped polygon, the outer peripheral surface of the stopper portion 34A and the inner peripheral surface of the body portion 33A are provided on the other end side of the shaft hole 35. And come into contact with each other. As shown in FIG. 11, on the one end side of the shaft hole 35, the outer peripheral surface of the inner tubular member 34 and the inner end 33C of the flange portion 33B are in contact with each other.

  According to this embodiment, the inner cylinder member 34 and the bush 33 cooperate to increase the strength around the shaft hole 35. Since the rotational force of the shaft member is dispersed by the inner tubular member 34 and then transmitted to the bush 33, the stress is concentrated on the engaging portion on the bush 33 side that engages with the engaging portion 36 of the inner tubular member 34. Is reduced. Thereby, the bush 33 can be made highly durable.

  If the cross-sectional shape of the inner tubular member 34 is formed into a substantially star-shaped polygon as the engaging portion 36 as in the present embodiment, the bush 33 and the inner tubular member 34 can be easily formed. In particular, if both the bush 33 and the inner cylinder member 34 are made of a metal press work product, the press work can be performed accurately with a simple press die structure, and the cost can be reduced as compared with the cutting work. it can.

  As in the present embodiment, on the one end side of the shaft hole 35, the outer peripheral surface of the inner cylindrical member 34 and the inner end 33C of the flange portion 33B abut, and on the other end side of the shaft hole 35, the stopper portion 34A is formed. With the structure in which the outer peripheral surface and the inner peripheral surface of the body portion 33A are in contact with each other, the inner cylindrical member 34 and the bush 33 cooperate together to further enhance the strength around the shaft hole 35.

  The three preferred embodiments have been described above. The engagement portions 6 and 36 are not limited to the shapes described in the first, second, and third embodiments as long as they can rotate the shaft member and the bushes 3 and 33 together.

1, 1A, 1B Impeller 2,32 Impeller body 3,33 Bushing 4,34 Inner cylinder member 4A, 34A Stopper part 5,35 Shaft hole 6,36 Engagement part 7 Linear engagement part 8 D-cut part 9 D-cut shaft Hole surface 11 Storage space 12 Flat surface 21 Key groove 22 Engagement protrusion 30 Shaft member

Claims (9)

An impeller body having a shaft hole through which a shaft member is formed,
A bush provided around the shaft hole of the impeller body,
An inner cylinder member having an engaging portion that is provided between the shaft member and the bush and that engages so as to rotate integrally with the shaft member and the bush,
An impeller characterized by comprising.   The impeller according to claim 1, wherein the inner cylinder member is caulked to the bush while being fitted in the shaft hole.   The impeller according to claim 2, wherein one end of the engaging portion of the inner cylinder member is bent outward in a radial direction of the shaft hole.   The impeller according to claim 3, wherein a housing space for housing one end of the bent engaging portion is formed at one end of the shaft hole. The bush has a linear engagement portion that extends radially inward and has a linear inner end.
The impeller according to claim 3 or 4, wherein the engaging portion is composed of a flat surface portion that engages with an inner end of the linear engaging portion. The bush has a keyway,
The impeller according to claim 3 or 4, wherein the engaging portion is formed of an engaging protrusion that engages with the key groove.   The impeller according to claim 1, wherein the bush has a flange portion that extends radially inward and is in contact with the inner cylindrical member.   The impeller according to claim 7, wherein the inner cylinder member has a stopper portion that extends radially outwardly and that is in contact with the bush and is in contact with an opening edge portion of the shaft hole.   The impeller according to any one of claims 1 to 8, wherein both the bush and the inner cylinder member are pressed products made of metal.

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