JP6899866B2 - Tolerance ring - Google Patents

Description

In the present invention, the outer ring having a cylindrical inner peripheral surface and the inner ring arranged radially inside the outer ring and having a cylindrical outer peripheral surface are press-fitted, and the transmission torque between the outer ring and the inner ring is reduced to a predetermined value or less. Regarding limiting tolerance rings.

In Patent Document 1 below, an outer ring having a cylindrical inner peripheral surface and an inner ring arranged inside the outer ring in the radial direction and having a cylindrical outer peripheral surface are press-fitted to determine a transmission torque between the outer ring and the inner ring. A tolerance ring that limits below the value is disclosed. This tolerance ring is composed of a strip-shaped plate material curved in a C shape, and the tolerance ring is formed with a plurality of protrusions protruding outward in the radial direction. When the tolerance ring is press-fitted between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring, the protruding end of the protrusion of the tolerance ring is pressed against the inner peripheral surface of the outer ring, and the inner peripheral surface of the tolerance ring is the inner ring. By being pressed against the outer peripheral surface, the protrusions are compressed in the radial direction and elastically deformed.

According to this tolerance ring, the torque input to the outer ring or the inner ring is equal to or less than a predetermined value by generating frictional resistance with respect to the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring according to the elastic force of the protrusion. In the case of, the relative rotation between the outer ring and the inner ring can be suppressed and a torque of a predetermined value or less can be transmitted between the outer ring and the inner ring. Further, when the torque input to the outer ring or the inner ring exceeds a predetermined value, slippage occurs between the protruding end of the protrusion of the tolerance ring and the inner peripheral surface of the outer ring, and the transmission of torque between the outer ring and the inner ring is cut off. Will be done. As a result, the transmission torque between the outer ring and the inner ring is limited to a predetermined value or less. Hereinafter, the predetermined value is referred to as "sliding torque".

Japanese Unexamined Patent Publication No. 2012-197927

However, in the tolerance ring disclosed in Patent Document 1, slip may occur between the inner peripheral surface of the tolerance ring and the outer peripheral surface of the inner ring. The value of the sliding torque when the outer peripheral surface of the inner ring is a sliding surface is different from the value of the sliding torque when the inner peripheral surface of the outer ring is a sliding surface. Therefore, the tolerance ring disclosed in Patent Document 1 has a problem that the sliding torque varies.

An object of the present invention made in view of the above facts is to provide a tolerance ring capable of reducing variations in sliding torque.

The first aspect of the present invention provides the following tolerance ring in order to solve the above problems. That is, it is press-fitted between the outer ring having a cylindrical inner peripheral surface and the inner ring having a cylindrical outer peripheral surface arranged inside the outer ring in the radial direction, and the transmission torque between the outer ring and the inner ring is equal to or less than a predetermined value. A tolerance ring that is limited to a plurality of protrusions that project to either the radial outer side or the radial inner side, and at least one of the plurality of protrusions is formed with a through opening that penetrates the protruding end. When the plurality of protrusions protrude outward in the radial direction, the peripheral edge of the through opening is inside the outer ring when it is press-fitted between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. By biting into the peripheral surface, the relative rotation with respect to the outer ring is suppressed, and when the plurality of protrusions project inward in the radial direction, the protrusion is press-fitted between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. the relative rotation is restrained periphery of the through-openings for said inner ring by biting into the outer peripheral surface of the inner ring, the through opening comprises a slit through the protruding end, the slits tolerance ring that extends in the circumferential direction when The first aspect of the present invention provides.

In addition, the second aspect of the present invention provides the following tolerance ring in order to solve the above problems. That is, it is press-fitted between the outer ring having a cylindrical inner peripheral surface and the inner ring having a cylindrical outer peripheral surface arranged inside the outer ring in the radial direction, and the transmission torque between the outer ring and the inner ring is equal to or less than a predetermined value. A tolerance ring that is limited to a plurality of protrusions that project to either the radial outer side or the radial inner side, and at least one of the plurality of protrusions is formed with a through opening that penetrates the protruding end. When the plurality of protrusions protrude outward in the radial direction, the peripheral edge of the through opening is inside the outer ring when it is press-fitted between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. By biting into the peripheral surface, the relative rotation with respect to the outer ring is suppressed, and when the plurality of protrusions project inward in the radial direction, the protrusion is press-fitted between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. When the peripheral edge of the through opening bites into the outer peripheral surface of the inner ring, the relative rotation with respect to the inner ring is suppressed, and the through opening includes a tolerance ring including a circular opening formed at the protruding end. The aspect provides.
Further, the third aspect of the present invention provides the following tolerance ring in order to solve the above problems. It is press-fitted between the outer ring having a cylindrical inner peripheral surface and the inner ring having a cylindrical outer peripheral surface arranged inside the outer ring in the radial direction, and limits the transmission torque between the outer ring and the inner ring to a predetermined value or less. A plurality of protrusions projecting to either the radial outer side or the radial inner side are formed in the tolerance ring, and at least one of the plurality of protrusions is formed with a through opening penetrating the protruding end. When the plurality of protrusions protrude outward in the radial direction, the peripheral edge of the through opening is the inner peripheral surface of the outer ring when it is press-fitted between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. When the plurality of protrusions protrude inward in the radial direction, the relative rotation with respect to the outer ring is suppressed by biting into the outer ring, and when the protrusions are press-fitted between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. The third aspect of the present invention provides a tolerance ring in which the peripheral edge of the through opening bites into the outer peripheral surface of the inner ring to suppress relative rotation with respect to the inner ring, and the plurality of protrusions are formed in a hemispherical shape.

In the tolerance ring of the present invention, when a plurality of protrusions protrude outward in the radial direction, the peripheral edge of the through opening is the outer ring when press-fitted between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. By biting into the inner peripheral surface, even if the torque input to the outer ring or the inner ring exceeds the sliding torque, the relative rotation with respect to the outer ring is suppressed, so that the outer peripheral surface of the inner ring becomes the sliding surface. Further, in the tolerance ring of the present invention, when a plurality of protrusions protrude inward in the radial direction, the peripheral edge of the through opening is formed when press-fitted between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. By biting into the outer peripheral surface of the inner ring, even if the torque input to the outer ring or the inner ring exceeds the sliding torque, the relative rotation with respect to the inner ring is suppressed, so that the inner peripheral surface of the outer ring becomes the sliding surface. Therefore, according to the tolerance ring of the present invention, either the inner peripheral surface of the outer ring or the outer peripheral surface of the inner ring is defined as the sliding surface, so that the variation in the sliding torque can be reduced.

A perspective view of a tolerance ring configured according to the present invention. The perspective view which shows the state which the tolerance ring shown in FIG. 1 is press-fitted between an outer ring and an inner ring. A partial cross-sectional view showing a state in which the tolerance ring shown in FIG. 1 is press-fitted between the outer ring and the inner ring. The schematic diagram which shows the elastic deformation of the tolerance ring shown in FIG. (A) A perspective view showing a first modification of the tolerance ring shown in FIG. 1, a front view of the tolerance ring shown in (b) and (a), and a side view of the tolerance ring shown in (c) and (a). (A) A perspective view showing a second modification of the tolerance ring shown in FIG. 1, a front view of the tolerance ring shown in (b) and (a), and a side view of the tolerance ring shown in (c) and (a). (A) A perspective view showing a third modification of the tolerance ring shown in FIG. 1, a front view of the tolerance ring shown in (b) and (a), and a side view of the tolerance ring shown in (c) and (a).

Hereinafter, preferred embodiments of the tolerance ring configured according to the present invention will be described with reference to the drawings.

The tolerance ring, which is indicated by reference numeral 2 in FIG. 1, is composed of a strip-shaped plate material curved in a C shape as a whole. As the material of the tolerance ring 2, an appropriate metal material such as stainless steel can be used. On the outer peripheral surface of the tolerance ring 2, a plurality of hemispherical protrusions 4 protruding outward in the radial direction are formed at intervals in the circumferential direction. The amount of protrusion of each protrusion 4 from the outer peripheral surface of the tolerance ring 2 is substantially the same, and each protrusion 4 is formed with a slit 6 as a through opening penetrating the protruding end. The longitudinal dimension of each slit 6 is equal to or less than the diameter of each protrusion 4, and each slit 6 is located within the region of each protrusion 4. Such a tolerance ring 2 can be formed by forming the protrusions 4 and the slits 6 by pressing the strip-shaped plate material, and then bending the strip-shaped plate material into a C shape by forming.

As shown in FIG. 1, the slit 6 of the illustrated embodiment extends in the circumferential direction of the tolerance ring 2. When the slit 6 extends in the circumferential direction, the dimension from the axial one-sided end of the slit 6 to the axial one-sided end of the tolerance ring 2 is compared with the case where the slit extends in the axial direction. Since the dimension from the other end of the slit 6 in the axial direction to the other end of the tolerance ring 2 in the axial direction becomes longer, the slit 6 is used as the starting point when the strip 6 is pressed to form the slit 6. The risk of the tolerance ring 2 breaking is reduced.

The outer ring 8 and the inner ring 10 into which the tolerance ring 2 is press-fitted will be described with reference to FIG. The outer ring 8 is formed in a cylindrical shape from an appropriate metal material, and has a cylindrical inner peripheral surface 8a. The inner ring 10 is formed in a cylindrical shape from an appropriate metal material, and has a cylindrical outer peripheral surface 10a. The inner ring 10 is arranged inside the outer ring 8 in the radial direction. A drive source such as a motor is connected to one of the outer ring 8 and the inner ring 10, and a driven member is connected to the other of the outer ring 8 and the inner ring 10. One of the outer ring 8 and the inner ring 10 may form a part of a drive source such as an output shaft, and the other of the outer ring 8 and the inner ring 10 may form a part of a driven member. Further, if the outer ring 8 has a cylindrical inner peripheral surface 8a, the overall shape of the outer ring 8 does not have to be cylindrical, and if the inner ring 10 has a cylindrical inner peripheral surface 8a, the inner ring 10 does not have to be cylindrical. The overall shape of is not necessarily cylindrical.

As shown in FIGS. 3 and 4, when the tolerance ring 2 is press-fitted between the inner peripheral surface 8a of the outer ring 8 and the outer peripheral surface 10a of the inner ring 10, the protruding end of each protrusion 4 of the tolerance ring 2 becomes the outer ring 8. Each protrusion 4 is compressed in the radial direction and elastically deformed by being pressed against the inner peripheral surface 8a and the inner peripheral surface of the tolerance ring 2 being pressed against the outer peripheral surface 10a of the inner ring 10. At this time, the peripheral edge of the slit 6 at the protruding end of the protrusion 4 bites into the inner peripheral surface 8a of the outer ring 8. Further, due to the elastic force of each protrusion 4, frictional resistance is generated between the protruding end of each protrusion 4 and the inner peripheral surface 8a of the outer ring 8, and the inner peripheral surface of the tolerance ring 2 and the outer circumference of the inner ring 10 are generated. Friction resistance is generated between the surface and the surface 10a. As a result, when the torque input to the outer ring 8 or the inner ring 10 is equal to or less than the sliding torque, the relative rotation between the outer ring 8 and the inner ring 10 is suppressed, and the torque is transmitted between the outer ring 8 and the inner ring 10.

When the torque input to the outer ring 8 or the inner ring 10 exceeds the sliding torque, slip occurs between the inner peripheral surface of the tolerance ring 2 and the outer peripheral surface 10a of the inner ring 10, and the torque between the outer ring 8 and the inner ring 10 is increased. Transmission is cut off. In the tolerance ring 2 of the illustrated embodiment, the peripheral edge of the slit 6 at the protruding end of the protrusion 4 bites into the inner peripheral surface 8a of the outer ring 8, so that the torque input to the outer ring 8 or the inner ring 10 causes the sliding torque. Even if it exceeds the limit, the relative rotation between the tolerance ring 2 and the outer ring 8 is suppressed, so that the outer peripheral surface 10a of the inner ring 10 becomes a sliding surface. Therefore, according to the tolerance ring 2 of the illustrated embodiment, since the outer peripheral surface 10a of the inner ring 10 is defined as the sliding surface, the variation in the sliding torque can be reduced.

Further, in the tolerance ring 2 of the illustrated embodiment, since the through opening formed in the protrusion 4 is the slit 6, the length of the portion that bites into the inner peripheral surface 8a of the outer ring 8 becomes relatively long, and the tolerance ring The relative rotation between 2 and the outer ring 8 is effectively suppressed.

The tolerance ring of the present invention is not limited to the above-described embodiment, and various modifications can be made from the above-described embodiment. For example, as shown in FIG. 5, on the outer peripheral surface of the tolerance ring 12 as the first modification, a plurality of truncated cone-shaped protrusions 14 projecting outward in the radial direction are formed at intervals in the circumferential direction. The protrusion 14 is formed with a circular opening 16 as a through opening that penetrates the protruding end. When the through opening is circular in this way, the decrease in rigidity of the protrusion 14 due to the formation of the through opening is alleviated, so that the tolerance ring 12 is formed between the inner peripheral surface 8a of the outer ring 8 and the outer peripheral surface 10a of the inner ring 10. When press-fitted between them, the peripheral edge of the circular opening 16 easily bites into the inner peripheral surface 8a of the outer ring 8.

Further, as in the tolerance ring 12'of the second modification shown in FIG. 6, in addition to the circular opening 16, slits 18 extending in the axial direction may be formed in each protrusion 14. Further, as in the tolerance ring 12 "of the third modification shown in FIG. 7, a slit 20 extending in the circumferential direction may be formed in each protrusion 14 in addition to the circular opening 16 and the slit 18 in the axial direction.

Each of the protrusions 4 of the above-described embodiment protrudes radially outward from the outer peripheral surface of the tolerance ring 2, but each protrusion 4 may protrude radially inward from the inner peripheral surface of the tolerance ring 2. In this case, when the tolerance ring 2 is press-fitted between the inner peripheral surface 8a of the outer ring 8 and the outer peripheral surface 10a of the inner ring 10, the peripheral edge of the slit 6 at the protruding end bites into the outer peripheral surface 10a of the inner ring 10. As a result, even if the torque input to the outer ring 8 or the inner ring 10 exceeds the sliding torque, the relative rotation of the tolerance ring 2 with respect to the inner ring 10 is suppressed, so that the inner peripheral surface 8a of the outer ring 8 becomes the sliding surface. Further, also in the modified examples shown in FIGS. 5 to 7, the protrusion 14 may protrude inward in the radial direction from the inner peripheral surface of the tolerance rings 12, 12', 12 ".

Although the slit 6 of the above-described embodiment extends in the circumferential direction, the slit may extend in any direction such as the axial direction. When the slit extends in the axial direction, the slit is orthogonal to the rotation direction of the outer ring 8 and the inner ring 10, so that the peripheral edge of the slit is the inner peripheral surface 8a of the outer ring 8 (or the outer circumference of the inner ring 10). Since it bites into the surface 10a), the relative rotation between the tolerance ring 2 and the outer ring 8 (or the inner ring 10) is more effectively suppressed.

Although the axial positions of the above-mentioned protrusions are aligned, the axial positions of the protrusions do not have to be aligned. Further, the shape of the protrusion is not limited to a hemispherical shape or a truncated cone shape, and any shape such as a pyramidal trapezoidal shape can be adopted.

The through opening may be formed in at least one of the plurality of protrusions. The shape of the through opening is not limited to the slit shape or the circular shape, and may be another shape such as a rectangular shape. The region in which the through opening is formed may include not only the protruding portion but also the non-protruding portion as long as it includes the protruding end. For example, the longitudinal dimension of the slit may be larger than the diameter of the protrusion.

2: Tolerance ring 4: Protrusion 6: Slit (through opening)
8: Outer ring 8a: Cylindrical inner peripheral surface 10: Inner ring 10a: Cylindrical outer peripheral surface

Claims (3)

It is press-fitted between the outer ring having a cylindrical inner peripheral surface and the inner ring having a cylindrical outer peripheral surface arranged inside the outer ring in the radial direction, and limits the transmission torque between the outer ring and the inner ring to a predetermined value or less. It ’s a tolerance ring
A plurality of protrusions projecting to either the radial outer side or the radial inner side are formed, and at least one of the plurality of protrusions is formed with a through opening penetrating the protruding end.
When the plurality of protrusions project outward in the radial direction, the peripheral edge of the through opening becomes the inner peripheral surface of the outer ring when press-fitted between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. By biting into the outer ring, the relative rotation to the outer ring is suppressed.
When the plurality of protrusions project inward in the radial direction, the peripheral edge of the through opening bites into the outer peripheral surface of the inner ring when it is press-fitted between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. As a result, the relative rotation with respect to the inner ring is suppressed .
The through opening comprises a slit through the protruding end, the tolerance ring wherein slits that extend in a circumferential direction. It is press-fitted between the outer ring having a cylindrical inner peripheral surface and the inner ring having a cylindrical outer peripheral surface arranged inside the outer ring in the radial direction, and limits the transmission torque between the outer ring and the inner ring to a predetermined value or less. It ’s a tolerance ring
A plurality of protrusions projecting to either the radial outer side or the radial inner side are formed, and at least one of the plurality of protrusions is formed with a through opening penetrating the protruding end.
When the plurality of protrusions project outward in the radial direction, the peripheral edge of the through opening becomes the inner peripheral surface of the outer ring when press-fitted between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. By biting into the outer ring, the relative rotation to the outer ring is suppressed.
When the plurality of protrusions project inward in the radial direction, the peripheral edge of the through opening bites into the outer peripheral surface of the inner ring when it is press-fitted between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. As a result, the relative rotation with respect to the inner ring is suppressed.
The through opening is a tolerance ring including a circular opening formed at the protruding end. It is press-fitted between the outer ring having a cylindrical inner peripheral surface and the inner ring having a cylindrical outer peripheral surface arranged inside the outer ring in the radial direction, and limits the transmission torque between the outer ring and the inner ring to a predetermined value or less. It ’s a tolerance ring
A plurality of protrusions projecting to either the radial outer side or the radial inner side are formed, and at least one of the plurality of protrusions is formed with a through opening penetrating the protruding end.
When the plurality of protrusions project outward in the radial direction, the peripheral edge of the through opening becomes the inner peripheral surface of the outer ring when press-fitted between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. By biting into the outer ring, the relative rotation to the outer ring is suppressed.
When the plurality of protrusions project inward in the radial direction, the peripheral edge of the through opening bites into the outer peripheral surface of the inner ring when it is press-fitted between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. As a result, the relative rotation with respect to the inner ring is suppressed.
A tolerance ring in which the plurality of protrusions are hemispherically formed.

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