JP2015017649A - Bearing device, and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device capable of preventing degradation of profile irregularity of a cylinder member to which caulking force is applied.SOLUTION: A cylinder member 30 is disposed on an outer periphery of a shaft member 20 and rotatably receives the shaft member 20. A holding member 60 is disposed on an outer periphery of the cylinder member 30 and holds the cylinder member 30 while restricting its rotation. A recessed portion 65 is formed on a part in the circumferential direction, of an inner peripheral face of the holding member 60, and a projecting portion 32 is formed on a part in the circumferential direction, of an outer peripheral face of the cylinder member 30. The recessed portion 65 is opened at an axial one end face 66 of the holding member 60, the projecting portion 32 faces the axial one end face of the cylinder member 30, and the recessed portion 65 and the projecting portion 32 are fitted to each other to be assembled. The axial one end face 66 of the holding member 60 is provided with a caulking groove 67 at the outer periphery of the recessed portion 65 and at a position where the caulking force can be applied to the projecting portion 32.

Description

  The present invention relates to a bearing device and a manufacturing method thereof.

  The bearing device disclosed in Patent Document 1 is a rotatable rotating shaft (shaft member), a cylindrical resin member (cylindrical member) that is disposed so as to cover the outer peripheral surface of the rotating shaft and receives the shaft member rotatably. And a back metal (holding member) which is arranged so as to cover the outer peripheral surface of the resin member and holds the cylindrical member by restricting rotation. The inner peripheral surface of the resin member is a radial bearing surface that receives a radial load. The resin member is press-fitted into the back metal and fixed. At that time, a sufficient tightening margin is secured between the outer diameter of the resin member and the inner diameter of the back metal.

JP 2004-36707 A

  In the case of the pressure obtaining method that requires a tightening allowance as described above, there is a situation in which it is difficult to obtain a predetermined tightening allowance at the time of temperature change due to a difference in linear expansion coefficient between the resin resin member and the metal back metal. . Further, if the tightening allowance is insufficient, a creep phenomenon may occur, and the radial bearing surface of the resin member may be worn.

  On the other hand, instead of the method of obtaining pressure, a caulking jig is pressed against one end surface of the back metal in the axial direction to deform one end in the axial direction of the back metal inward in the radial direction, and the deforming force is used for the back metal. It is also possible to employ a caulking method for fixing the resin to the resin member. According to such a caulking method, it is not necessary to consider the fastening margin at the initial stage of assembling the resin member to the back metal, and the above problem can be solved.

  However, in the case of the caulking method, there is a situation that it is difficult to accurately maintain the surface accuracy of the radial bearing surface of the resin member due to the back metal deforming radially inward. For this reason, normally, in order to ensure surface accuracy, an inner diameter finishing process of the resin member is required later, and there is a problem that the cost is increased accordingly.

  The present invention has been completed based on the above-described circumstances, and an object thereof is to provide a bearing device capable of preventing a reduction in surface accuracy of a member to which a caulking force is applied. .

  The present invention is arranged to cover a rotatable shaft member, an outer peripheral surface of the shaft member, a cylindrical member that rotatably receives the shaft member, and an outer peripheral surface of the cylindrical member, A holding member that holds and restricts the rotation of the cylindrical member, the inner circumferential surface of the holding member is provided with a recess in a part of the circumferential direction, and the circumferential surface of the cylindrical member is A convex portion is provided on the portion, the concave portion opens on one end surface in the axial direction of the holding member, the convex portion faces the one end surface in the axial direction of the cylindrical member, and the concave portion and the convex portion are fitted to each other. The holding member is characterized in that a caulking groove is provided on one end surface in the axial direction of the holding member at the outer periphery of the concave portion and at a position where a caulking force can be applied to the convex portion. Have

  Since the caulking groove is provided at a position where the caulking force can be applied to the convex portion on the outer periphery of the concave portion, the holding member and the cylindrical member are caulked and fixed via the fitting portion between the concave portion and the convex portion. Since the caulking force is not easily transmitted to the inner peripheral surface of the cylindrical member, it is possible to prevent the surface accuracy of the inner peripheral surface of the cylindrical member from being lowered.

It is sectional drawing of the bearing apparatus of Example 1 of this invention. It is a separation sectional view of a holding member and a cylinder member. It is a separation perspective view of a holding member and a cylinder member. It is a principal part enlarged view of each axial direction one end surface of a holding member and a cylinder member. FIG. 4 is a view corresponding to FIG. 4 of a bearing device according to a second embodiment of the present invention.

Preferred embodiments of the present invention are shown below.
The caulking groove has a shape along the concave portion. Thereby, since the caulking force acts uniformly along the concave portion, it is possible to prevent the convex portion from being deformed into distortion.

  The concave portion, the convex portion, and the caulking groove all have an arcuate cross section. Thereby, since the input center of the caulking force can be positioned outside the inner peripheral surface of the cylindrical member, the surface accuracy can be maintained without adversely affecting the inner peripheral surface shape of the cylindrical member.

  The convex portion is provided over the entire axial length of the cylindrical member. Thereby, the fitting state of a recessed part and a convex part is maintained stably, and it can prevent that a cylinder member inadvertently shifts in the circumferential direction with respect to a holding member.

  In the manufacturing method of the bearing device having the above-described configuration, the cylindrical member is inserted into the holding member while the convex portion is fitted into the concave portion, and then a caulking jig is pushed onto one end surface in the axial direction of the holding member. By applying, the caulking groove is stamped. Thereby, when the holding member and the cylindrical member are caulked and fixed, it is possible to easily manufacture a bearing device that prevents the surface accuracy of the inner peripheral surface of the cylindrical member from being lowered.

  When the cylindrical member is properly inserted into the holding member, the other end surface in the axial direction of the cylindrical member is abutted against the retaining portion provided on the inner peripheral surface of the holding member. Accordingly, the cylindrical member is positioned in the axial direction with respect to the holding member, so that the caulking process can be stably performed.

<Example 1>
A first embodiment of the present invention will be described with reference to FIGS. The bearing device 10 according to the first embodiment exemplifies a case where the bearing device 10 is provided in an oil pump (the whole is not shown) in an automobile transmission. As illustrated in FIG. 1, the shaft member 20, the cylindrical member 30, and the holding member are provided. A member 60 is provided.

The shaft member 20 is a shaft that drives the oil pump, and is rotatably supported by the cylindrical member 30.
The holding member 60 constitutes a cover of the oil pump. As shown in FIG. 2, the holding member 60 has a cylindrical support portion 61 and a height from the other axial end side (the left side in the drawing) of the outer periphery of the support portion 61. And a vertical wall 62 extending in the direction. The support portion 61 is provided with an insertion hole 63 that penetrates in the axial direction (the horizontal direction in the figure). A retaining portion 64 is provided on the other axial end side of the inner peripheral surface of the insertion hole 63 in the support portion 61. The retaining portion 64 is configured to protrude over the entire circumference to the inside in the radial direction of the insertion hole 63.

  As shown in FIG. 3, a recess 65 is provided on the inner peripheral surface of the insertion hole 63 in the support portion 61. The recess 65 is formed to be radially inwardly formed at one place on the inner peripheral surface of the insertion hole 63 in the circumferential direction. Specifically, the recess 65 extends substantially over the entire length in the axial direction of the insertion hole 63 excluding the retaining portion 64 and opens to the axial end surface 66 of the support portion 61. Further, the concave portion 65 has a concave curved surface shape, specifically a circular arc shape (substantially semicircular arc shape), and has the same cross-sectional shape over the entire length. In the first embodiment, the recess 65 is positioned at the upper end in the vertical direction of the insertion hole 63 in the installed state of the holding member 60.

  As shown in FIG. 1, the cylindrical member 30 is a cylindrical bush arranged so as to cover the outer peripheral surface of the shaft member 20 and rotatably receives the shaft member 20. The inner peripheral surface of the cylindrical member 30 is a radial bearing surface 31 that can slide on the outer peripheral surface of the shaft member 20. Further, the cylindrical member 30 is inserted into the insertion hole 63 of the support portion 61 from one end side in the axial direction (right side in FIG. 1), is stopped by the retaining portion 64, and is retained by the retaining portion 64. The whole is accommodated in the insertion hole 63.

  As shown in FIGS. 3 and 4, a convex portion 32 that can be fitted into the concave portion 65 is provided on the outer peripheral surface of the cylindrical member 30. The convex portion 32 is formed to protrude radially outward at one place in the circumferential direction on the outer peripheral surface of the cylindrical member 30. Specifically, the convex portion 32 extends over the entire length of the cylindrical member 30 in the axial direction and faces both axial end surfaces (one axial end surface 33 and the other axial end surface 34) of the cylindrical member 30. . Moreover, the convex part 32 comprises the cross-sectional convex curved surface shape, the cross-section circular arc shape (section semi-circular arc shape) in detail, and is exhibiting the same cross-sectional shape over the full length. In the case of Example 1, the convex part 32 is arrange | positioned at the upper end of the cylinder member 30 at the time of installation so that it may correspond to the recessed part 65, and the radial direction thickness of the main-body part (part except the convex part 32) of the cylinder member 30. Consists of larger protruding dimensions.

  Here, the outer diameter of the main body portion of the cylindrical member 30 is set to be smaller than the inner diameter of the insertion hole 63 of the support portion 61. On the other hand, the radius of curvature of the convex portion 32 may be smaller or larger than the radius of curvature of the concave portion 65 or may be the same as the radius of curvature of the concave portion 65 in consideration of dimensional tolerances. . For this reason, the main body portion of the cylindrical member 30 is fitted into the insertion hole 63 of the support portion 61 and the convex portion 32 is fitted into the concave portion 65 in any one of the gap fitting, intermediate fitting, and interference fitting. It will be. As a result, the fitting portion between the tubular member 30 and the holding member 60 can be set with relatively rough dimensions.

  The shaft member 20 and the holding member 60 are made of metal, preferably made of aluminum-based metal or iron-based metal, and the cylindrical member 30 may be made of metal, but is made of resin such as thermoplastic resin. However, the material is not particularly limited.

In the case of the first embodiment, the cylindrical member 30 is integrally fixed to the support portion 61 of the holding member 60 by caulking through a fitting portion between the convex portion 32 and the concave portion 65. Hereinafter, the manufacturing method will be described.
First, the cylindrical member 30 is inserted into the insertion hole 63 of the support portion 61 from one end side in the axial direction. As shown in FIG. 1, when the cylindrical member 30 is properly inserted into the insertion hole 63, the other axial end surface 34 of the cylindrical member 30 comes into contact with the retaining portion 64, thereby further inserting the cylindrical member 30. Is blocked. In this state, a caulking jig (not shown) is pressed against the outer periphery of the recess 65 in the axial end surface 66 of the support portion 61 to perform caulking. In this case, the caulking jig has an arc-shaped pressing portion that is curved along the edge of the recess 65, and the caulking jig is caulked on one end surface 66 in the axial direction of the support portion 61 as shown in FIG. 4. As the jig is pressed, a caulking groove 67 that is curved along the edge of the recess 65 is formed by being stamped. The caulking groove 67 has a cross-sectional curved shape that is substantially parallel to the edge of the concave portion 65, specifically, an arc-shaped cross section, and is disposed away from the radial bearing surface 31 of the cylindrical member 30.

  As described above, when the one end surface 66 in the axial direction of the support portion 61 is caulked, as shown in FIG. 1, the caulking groove 67 and the insertion hole 63 in the one end portion in the axial direction of the support portion 61. The portion located between them is plastically deformed radially inward, whereby the inner peripheral surface of the concave portion 65 is tightly pressed against the outer peripheral surface of the convex portion 32, so that the cylindrical member 30 is fixed integrally to the support portion 61. The In this case, as shown in FIG. 4, the input center X of the caulking force that accompanies the caulking process is located outside the radial bearing surface 31 (inner peripheral surface) of the cylindrical member 30. It will be located on the virtual inner peripheral surface 68 when 63 is made to continue in the circumferential direction. For this reason, the caulking force is applied exclusively to the convex portion 32 side, and excessive stress is not applied to the radial bearing surface 31 side of the cylindrical member 30. As a result, the predetermined surface accuracy of the radial bearing surface 31 can be maintained without adversely affecting the shape of the circumferential surface of the radial bearing surface 31 of the cylindrical member 30. Note that the input center X of the caulking force is substantially the same position as the center of curvature of the caulking groove 67.

  As described above, according to the first embodiment, the caulking groove 67 is provided on the outer periphery of the concave portion 65 and at a position where the caulking force can be applied to the convex portion 32, so that the concave portion 65 and the convex portion 32 are fitted to each other. While the holding member 60 and the cylindrical member 30 are fixed by caulking through the portion, it is possible to avoid a large caulking force from acting on the radial bearing surface 31 of the cylindrical member 30, and to improve the surface accuracy of the radial bearing surface 31. Can keep. In this case, since the caulking groove 67 has a shape along the concave portion 65, a uniform caulking force can be applied to the convex portion 32.

  Further, since the concave portion 65, the convex portion 32, and the caulking groove 67 are all arc-shaped in cross section, the input center X of the caulking force can be positioned outside the radial bearing surface 31 of the cylindrical member 30, and the radial The surface accuracy of the bearing surface 31 can be kept better. Further, the cylindrical member 30 is positioned in the axial direction by the retaining portion 64, and in this state, it is possible to stably perform the caulking process on the one axial end surface 66 of the support portion 61.

<Example 2>
FIG. 5 shows a second embodiment of the present invention. In the bearing device 10A of the second embodiment, the shape of the caulking groove 67A is different from that of the first embodiment, but the other forms are the same as those of the first embodiment.

  The caulking groove 67A is configured to extend linearly on the outer periphery of the recess 65 in the axial end surface 66 of the support portion 61 substantially parallel to the tangential direction of the caulking groove 67A. Here, when a caulking jig (not shown) acts along the caulking groove 67A, the caulking force acts exclusively on the convex portion 32, and the radial bearing surface 31 of the cylindrical member 30 away from the caulking groove 67A is applied. And difficult. Therefore, the surface accuracy of the radial bearing surface 31 of the cylindrical member 30 can be maintained even if the caulking groove 67A is not shaped along the recess 65 as in the second embodiment.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following aspects are also included in the technical scope of the present invention.
(1) The convex portion and the concave portion may be provided at intervals in a plurality of locations in the circumferential direction on the outer peripheral surface of the cylindrical member and the inner peripheral surface of the holding member, respectively.
(2) The convex part and the concave part may extend in the axial direction short on the outer peripheral surface of the cylindrical member and the inner peripheral surface of the holding member, respectively.
(3) The concave portion may have a concave corner surface shape and the convex portion may have a convex corner surface shape.
(4) The retaining portion may be a portion that protrudes partially in the circumferential direction on the inner peripheral surface of the insertion hole of the support portion of the holding member.
(5) The present invention is not limited to oil pumps and can be widely applied to automobile bearing devices.

DESCRIPTION OF SYMBOLS 10, 10A ... Bearing apparatus 20 ... Shaft member 30 ... Cylindrical member 31 ... Radial bearing surface 32 ... Convex part 33 ... One axial end surface 34 ... Other axial end surface 60 ... Holding member 63 ... Insertion hole 64 ... Retaining part 65 ... Recess 66: One axial end surface 67, 67A ... Caulking groove

Claims (6)

A rotatable shaft member;
A cylindrical member that is disposed so as to cover the outer peripheral surface of the shaft member, and that rotatably receives the shaft member;
A holding member that is disposed so as to cover an outer peripheral surface of the cylindrical member, and holds the cylindrical member by restricting rotation;
The inner peripheral surface of the holding member is provided with a recess in a part of the circumferential direction,
On the outer peripheral surface of the cylindrical member, a convex portion is provided in a part of the circumferential direction,
The concave portion opens on one end surface in the axial direction of the holding member, the convex portion faces the one axial end surface of the cylindrical member, and the concave portion and the convex portion are fitted to each other and assembled.
The bearing device is characterized in that a caulking groove is provided on one end surface in the axial direction of the holding member at a position where the caulking force can be applied to the convex portion on the outer periphery of the concave portion.   The bearing device according to claim 1, wherein the caulking groove has a shape along the concave portion.   The bearing device according to claim 2, wherein each of the concave portion, the convex portion, and the caulking groove has a circular arc shape in cross section.   The bearing device according to any one of claims 1 to 3, wherein the convex portion is provided over the entire axial length of the cylindrical member. A method for manufacturing a bearing device according to any one of claims 1 to 4,
The caulking groove is engraved by inserting the cylindrical member into the holding member while fitting the convex portion into the concave portion, and then pressing a caulking jig against one end surface in the axial direction of the holding member. The manufacturing method of the bearing apparatus characterized by these.   6. The axially opposite end surface of the cylindrical member is abutted against a retaining portion provided on an inner peripheral surface of the holding member when the cylindrical member is normally inserted into the holding member. The manufacturing method of the bearing apparatus of description.

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