JPH11344011A - Ring member fixing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To offer a ring member fixing structure which can prevent a ring member caulked in a circumferential groove formed at the periphery of a shaft from playing in the axial direction. SOLUTION: A circumferential groove 4a is formed at the periphery of a shaft 4, and a circumferential groove 60a is formed at the bore of a ring member 60 to be caulked from the periphery toward the bore in such a way as fitted in the groove 4a. The bore portions 60b and 60c of this ring member 60 confronting with the groove 60a interposed are pressed to a shaft 4 at the time of caulking and deformed plastically so that they separate from each other in the axial direction. By the plastic deformation, the bore portions 60b and 60c are pressed to those inner surfaces 4a' and 4a" of the shaft groove 4a confronting each other in the axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing a ring member to be fitted to a shaft.

[0002]

2. Description of the Related Art In a steering apparatus, for example, when a steering shaft that is rotated by steering is supported by a bearing, the bearing is formed by a ring member such as a collar fitted into a circumferential groove formed on the outer periphery of the steering shaft. Axial movement is prevented.

Heretofore, the ring member has been pressed against the steering shaft by being caulked from the outer periphery to the inner periphery, thereby being fixed to the steering shaft.

[0004]

In the conventional structure, since the inner periphery of the ring member is pressed against the steering shaft only in the radial direction, there is a problem that the ring member rattles in the axial direction in the circumferential groove of the steering shaft. there were. Further, there is a similar problem in a ring member which is swaged from the inner circumference to the outer circumference so as to be fitted into a circumferential groove formed in the inner circumference of the cylindrical shaft.

An object of the present invention is to provide a fixing structure for a ring member which can solve the above problems.

[0006]

A first feature of the present invention is a fixing structure of a ring member which is swaged from the outer periphery to the inner periphery so as to be fitted into a peripheral groove formed on the outer periphery of the shaft. A peripheral groove is formed on the inner periphery of the ring member, and inner peripheral portions facing each other via the peripheral groove in the ring member are separated from each other along the axial direction by being pressed against the shaft during the caulking. The inner peripheral portions of the ring member that face each other through the circumferential groove are pressed against the inner surfaces of the shaft that face each other in the axial direction by the plastic deformation. . According to this configuration, the inner peripheral portions of the ring member that oppose each other via the peripheral groove are plastically deformed so as to be separated from each other along the axial direction, and thus oppose each other in the axial direction of the peripheral groove of the shaft. It is pressed against the inside. This prevents the ring member from rattling in the axial direction in the circumferential groove of the shaft.

A second feature of the present invention is a ring member fixing structure which is caulked from an inner periphery to an outer periphery so as to be fitted into a peripheral groove formed on an inner periphery of a cylindrical shaft. A peripheral groove is formed on the outer periphery of the ring member, and the outer peripheral side portions of the ring member that face each other via the peripheral groove are pressed against the shaft at the time of the caulking, and are plastically deformed so as to separate from each other along the axial direction. The outer peripheral portions of the ring member opposed to each other via the peripheral groove are pressed against inner surfaces of the shaft which are opposed to each other in the axial direction of the peripheral groove by plastic deformation. According to this configuration, the outer peripheral portions of the ring member that oppose each other via the peripheral groove are plastically deformed so as to separate from each other along the axial direction, so that the inner surfaces opposing each other in the axial direction of the peripheral groove of the shaft. Pressed to. This prevents the ring member from rattling in the axial direction in the circumferential groove of the shaft.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rack and pinion type power steering apparatus 1 shown in FIG. 1 has an input shaft 2 connected to a steering wheel (not shown) and an output connected to the input shaft 2 via a torsion bar 3. A shaft 4 is provided. The torsion bar 3 is connected to the input shaft 2 via a pin 5 and a serration 6
And the output shaft 4. A helical pinion 7 is integrally formed on the output shaft 4, and a helical rack 8 meshing with the pinion 7 is connected to wheels (not shown). The input shaft 2 is supported by a valve housing 10 a via a bearing 9 and is supported by an output shaft 4 via a bush 11. The output shaft 4 is supported by a pinion housing 10b connected to the valve housing 10a via a ball bearing 12 and a bush 13. The rack 8 is supported by a pinion housing 10b via a support member 16. As a result, the rotation of the input shaft 2 due to the steering is transmitted to the pinion 7 via the torsion bar 3 so that the rack 8 moves in the vehicle width direction. The movement of the rack 8 changes the steering angle of the wheels. The input shaft 2 and the output shaft 4
Are elastically rotated relative to each other by the torsion of the torsion bar 3 according to the steering resistance.

The hydraulic cylinder 1 serves as a hydraulic actuator capable of generating a steering assist force according to the hydraulic pressure of the supplied hydraulic oil.
8 are provided. The hydraulic cylinder 18 includes a cylinder tube constituted by a pinion housing 10b, a piston 20 formed integrally with the rack 8, and a pair of oil chambers 21 and 22 partitioned by the piston 20.

A rotary hydraulic control valve 23 is provided in the valve housing 10a. The hydraulic control valve 23 has piping connection ports 32 and 34 with the oil chambers 21 and 22 of the hydraulic cylinder 18, a piping connection port 36 with the pump 37, and a piping connection port 40 with the tank 41. The hydraulic pressure of the pressure oil supplied from the pump 37 to one of the two oil chambers 21 and 22 of the hydraulic cylinder 18 is controlled according to the relative rotation amount of the input shaft 2 and the output shaft 4, and the two oil chambers 21 and 22 are controlled. The oil discharged from the other is guided to the tank 41. A steering assist force corresponding to the hydraulic pressure of the pressure oil supplied to the hydraulic cylinder 18 is applied. As the hydraulic control valve 23, a known one can be used.

The outer race 12a of the ball bearing 12 for supporting the output shaft 4 has two housings 10a and 10a.
By being sandwiched by b, axial movement is prevented. The inner race 12 b of the ball bearing 12 is sandwiched between a step 4 ′ on the outer periphery of the output shaft 4 and a metal ring member 60 fixed to the output shaft 4,
Axial movement is prevented.

As shown in FIGS. 2A and 2B, the inner and outer circumferences of the ring member 60 extend along a cylindrical surface, and a circumferential groove 60a is formed in the inner circumference. This ring member 6
In the present embodiment, the inner surface of the circumferential groove 60a formed on the inner circumference of 0 has a cross-sectional shape along a curved surface of an arc, but the shape is not particularly limited.

The ring member 60 is swaged from the outer circumference to the inner circumference so as to be fitted into a circumferential groove 4a formed on the outer circumference of the output shaft 4. For example, as shown by a two-dot chain line in (1) of FIG. 2, a plurality of (four in the present embodiment) pressing members 70 of the caulking device are provided outside the ring member 60 at circumferential intervals.
Are arranged, and the ring member 60 is
Is caulked from the outer circumference to the inner circumference by a force along a radial direction indicated by an arrow in the figure, and the ring member 60 is fixed to the output shaft 4 by the caulking. A known caulking device can be used.

The inner peripheral portions 60b and 60c of the ring member 60 which are opposed to each other via the peripheral groove 60a are pressed against the output shaft 4 at the time of caulking. As a result, the inner peripheral portions 60b and 60c are pressed against the outer periphery of the output shaft 4 along the radial direction.
As shown by a broken line in FIG. 5, the plastic deformation is performed so as to be separated from each other along the axial direction by an axial force acting as shown by an arrow in the figure accompanying the deformation of the circumferential groove 60a of the ring member 60.

One of the inner peripheral side portions 60b and 60c of the ring member 60 facing each other via the peripheral groove 60a is the inner surfaces 4a 'and 4a facing each other in the axial direction of the peripheral groove 4a of the output shaft 4. ", One of the inner peripheral portions 60b, 60c has the inner surface 4a ',
4a "is pressed by its plastic deformation.

For example, the inner diameter of the ring member 60 before caulking is 20.2 mm, and the outer diameter is 26.2.
mm, the axial dimension is 2.4 mm, the axial dimension of the peripheral groove 60a is 1.2 mm, the depth of the peripheral groove 60a is 0.7 mm, and the outer diameter of the output shaft 4 at the opening edge of the peripheral groove 4a is 1 mm.
The axial dimension of the peripheral groove 4a is 8.5 mm, and the depth of the peripheral groove 4a is 0.75 mm. These dimensions are merely examples, and the present invention is not limited to these numerical values.

According to the second embodiment, the ring member 6
The inner peripheral side portions 60b and 60c facing each other via the circumferential groove 60a at 0 are plastically deformed so as to be separated from each other along the axial direction, thereby facing each other in the axial direction of the circumferential groove 4a of the output shaft 4. The ring member 60 is pressed against the inner surfaces 4a 'and 4a ". This prevents the ring member 60 from rattling in the axial direction in the circumferential groove 4a of the output shaft 4.

FIGS. 4A, 4B and 5 show a second embodiment of the present invention. The present embodiment is different from the first embodiment in that the present invention is applied to a fixing structure of a ring member 160 which is swaged from the inner circumference to the outer circumference so as to be fitted into a circumferential groove 104a formed in the inner circumference of the cylindrical shaft 104. It is applied.

The ring member 160 is, for example, a bearing 11 fitted on the inner periphery of the cylindrical shaft 104.
It is used to prevent axial movement such as 2. The inner and outer circumferences of the ring member 160 are along a cylindrical surface, and a circumferential groove 160a is formed on the outer circumference. In the present embodiment, the inner surface of the circumferential groove 160a formed on the outer periphery of the ring member 160 has a cross-sectional shape along the curved surface of an arc, but the shape is not particularly limited.

The ring member 160 is swaged from the inner circumference to the outer circumference so as to be fitted into the circumferential groove 104a formed on the inner circumference of the cylindrical shaft 104. For example, as shown by a two-dot chain line in FIG. 4, a plurality of (four in the present embodiment) pressing members 1 of the caulking device are provided inside the ring member 160 at circumferential intervals.
70 is arranged, and the ring member 160 is pressed by each pressing member 170 by a force along a radial direction in a direction indicated by an arrow in the drawing.
The ring member 160 is fixed to the cylindrical shaft 104 by swaging from the inner circumference to the outer circumference.
A known caulking device can be used.

The circumferential groove 160 in the ring member 160
outer peripheral side portions 160b, 160 opposed to each other through a
c is pressed against the cylindrical shaft 104 at the time of the above-mentioned caulking. Thereby, the inner peripheral side portions 160b, 160c
Is radially pressed against the outer periphery of the cylindrical shaft 104, and further acts as shown by the arrow in the figure with the deformation of the circumferential groove 160a of the ring member 160 as shown by the broken line in FIG. Due to the axial force, they are plastically deformed so as to separate from each other along the axial direction.

The circumferential groove 160 in the ring member 160
outer peripheral side portions 160b, 160 opposed to each other through a
c are inner surfaces 104 a ′ and 104 facing each other in the axial direction of the circumferential groove 104 a of the cylindrical shaft 104.
a ", the outer peripheral side portions 160b, 160c
Are pressed against the other of the inner surfaces 104a ', 104a "by their plastic deformation.

According to the second embodiment, the ring member 1
The outer peripheral portions 160b and 160c facing each other via the circumferential groove 160a in the cylindrical shaft 60 are plastically deformed so as to separate from each other along the axial direction, thereby forming the cylindrical shaft 104.
Inner surfaces 1 of the circumferential grooves 104a facing each other in the axial direction
04a ', 104a ". Thereby,
The ring member 160 can be prevented from rattling in the axial direction in the circumferential groove 104a of the cylindrical shaft 104.

The present invention is not limited to the above embodiment. For example, the ring member may be used to prevent axial movement of an object other than the bearing, or may be used for purposes other than preventing the object from moving in the axial direction, and its use is not particularly limited. Further, the ring member may be divided and used, and the same operation and effect can be obtained.

[0025]

According to the present invention, it is possible to provide a ring member fixing structure capable of preventing the ring member caulked in the circumferential groove formed in the shaft from rattling in the axial direction.

[Brief description of the drawings]

FIG. 1 is a sectional view of a rack and pinion type power steering device according to a first embodiment of the present invention.

FIG. 2 is a front view of the ring member according to the first embodiment of the present invention, and FIG.

FIG. 3 is a sectional view of a main part of the first embodiment of the present invention.

FIG. 4 is a front view of a ring member according to a second embodiment of the present invention, and FIG.

FIG. 5 is a sectional view of a main part according to a second embodiment of the present invention.

[Explanation of symbols]

 4, 104 shaft 4a, 104a circumferential groove 4a ', 4a ", 104a', 104a" inner surface 60, 160 ring member 60a, 160a circumferential groove 60b, 60c, 160b, 160c inner circumferential side portion

Claims (2)

[Claims] 1. A fixing structure of a ring member which is swaged from an outer periphery to an inner periphery so as to be fitted into a peripheral groove formed on an outer periphery of a shaft, wherein a peripheral groove is formed on an inner periphery of the ring member. The inner peripheral portions facing each other via the peripheral groove in the ring member are plastically deformed so as to be separated from each other along the axial direction by being pressed against the shaft at the time of the caulking. A ring member fixing structure, wherein inner peripheral portions opposing each other are pressed against inner surfaces opposing each other in the axial direction of the circumferential groove of the shaft by plastic deformation thereof. 2. A fixing structure of a ring member which is swaged from an inner periphery to an outer periphery so as to be fitted into a peripheral groove formed on an inner periphery of a cylindrical shaft, wherein a peripheral groove is formed on an outer periphery of the ring member. The outer peripheral portions facing each other via the peripheral groove in the ring member are plastically deformed so as to be separated from each other along the axial direction by being pressed against the shaft during the caulking, and the peripheral groove in the ring member is formed. A ring member fixing structure, wherein outer peripheral portions opposing each other are pressed against inner surfaces opposing each other in an axial direction of a circumferential groove of the shaft by plastic deformation thereof.