JPH11247869A - Bearing mounting structure and mounting method - Google Patents

Abstract

(57) [Abstract] [Purpose] In a structure in which a bearing is mounted on a housing or a shaft, it can be assembled at a low cost without increasing the number of parts, and once assembled, it is securely fixed and the bearing slides out. There is no structure and assembly method. The bearing 30 includes an outer ring 31, an inner ring 32, and a ball 33.
And a cage 34, whose axial direction is regulated by a stopper 11 formed on the inner periphery of the housing 10, and fitted into a bearing mounting portion 12 on the inner periphery of the housing 10. On the end face of the bearing 30 opposite to the stopper 11, a projection 15 having a predetermined width is formed continuously or intermittently on the inner circumference of the housing 10 over the entire circumference. Bearing 3
The protrusions 15 are press-fitted by elastically deforming the projections 15 or the housing 10 is heated to a temperature higher than that of the bearings 30 so that the inner diameter formed by the projections 15 is enlarged and smoothly incorporated, thereby securely fixing the bearings 30 to the housing 10. I do.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a structure for fixing a bearing mounted on an industrial machine, a vehicle, or the like to a housing or a shaft, and a method of assembling the same.

[0002]

2. Description of the Related Art In general, a bearing for rotation is composed of an outer ring, an inner ring, and a ball or the like revolving while rotating between the outer ring and the inner ring. This bearing is mounted on various industrial machines and vehicles. At this time, the outer ring is generally fixed to the housing and the inner ring is fixed to the shaft, and has a function of enabling free rotation of the shaft, and is an important component as a basic mechanical element.

A conventional bearing mounting structure in which this bearing is employed, for example, in the vicinity of a control valve of a power steering device for a vehicle will be described with reference to FIG. A valve shaft (hereinafter, referred to as a shaft) 120 connected to an intermediate shaft (not shown) is rotatably supported by a control valve housing (hereinafter, referred to as a housing) 110 via a bearing 130 near an upper portion of FIG. ing. The rolling element of the bearing 130 used here is a ball.

[0004] The shaft 120 has a cylindrical shape, and a torsion bar 125 extends in the axial direction at an inner peripheral portion. The upper end of the torsion bar 125 is fixedly connected to the shaft 120 by the first pin 122, and the lower end is fixedly connected to the pinion shaft 160 by the second pin 162. The upper end of the rack housing 140 is fitted to the lower end of the housing 110, and a vertical column-shaped cavity and a cavity extending vertically in the paper of FIG. . The pinion shaft 160 has upper and lower bearings 135 and 1.
The pinion is supported by the rack housing 140 via the pinion 36, and a pinion formed below the pinion shaft 160 is fitted to the rack 170. Pinion shaft 1
When the wheel 60 rotates, the rack 170 correspondingly moves as shown in FIG.
Move perpendicular to the paper.

Therefore, when the driver rotates the steering wheel (not shown), the main shaft and intermediate shaft (not shown) are rotated, and the shaft 120 shown in FIG. 5 is rotated. Then shaft 1
A torsion bar 125 connected to the pinion shaft 20 via a first pin 122 rotates the pinion shaft 160 via a second pin 162 at the lower end.
By raising and lowering 0 in a direction perpendicular to the plane of FIG. 5,
A knuckle (not shown) connected to the rack 170 is rotated to change the direction of the wheel, thereby performing a steering function.

The third pin 16 is attached to the pinion shaft 160.
3, a cylindrical control valve 150 is fixed and covers the shaft 120 from the outer periphery. Since the torsion bar 125 is interposed between the shaft 120 and the pinion shaft 160, the torsion bar is twisted when a force for relatively rotating the shaft 120 and the pinion shaft 160 acts. As a result, the control valve 150 and the shaft 120 connected to the pinion shaft 160 slightly rotate relative to each other in the rotation direction. The power steering device is controlled by controlling the hydraulic pressure by using the relative rotation to increase the moving force of the rack 170.

Referring to FIG. 4, a bearing 130 includes an outer ring 131, an inner ring 132, a plurality of balls 133, and a cage 134. The outer ring 131 is pressed into the bearing mounting portion 112 adjacent to the stopper 111 on the inner periphery of the housing 110, but is prevented from moving leftward in FIG. 4 in the axial direction by the stopper 111 formed integrally with the housing 110. Have been. Shaft 120 and bearing 1
The inner ring 132 is attached to the inner ring 132 in a clearance fit or an intermediate fit at room temperature. An oil seal 180 is fitted to the housing 110 on the left side of the bearing 130, so that the shaft 120 can rotate freely. However, the oil inside the housing is prevented from flowing out and foreign matter such as dust from the outside enters. Is preventing.

[0008]

The conventional mounting structure of the bearing 130 has the following problems. The bearing 130 is fitted into the housing 110 by press-fitting the outer ring 131 of the bearing 130 into the bearing mounting portion 112 which is an inner peripheral surface of the housing 110. The relationship with the inner diameter of the portion 112 has manufacturing variations, so that the fitting is loose and the fitting is loosened during use and the bearing 130 may slip and move.

Accordingly, it is an object of the present invention to provide a bearing mounting structure for securely fixing a bearing without increasing the number of parts and a method of assembling the bearing.

[0010]

Means and Effects for Solving the Problems In order to achieve the above objects, the following means are provided. The invention according to claim 1 is characterized in that the bearing has a housing fitted with an outer periphery and a stopper provided with a stopper for receiving one end surface of the bearing in an axial direction, and the bearing is fitted with an inner periphery. A bearing mounting structure comprising a shaft, wherein a projection is integrally formed on the inner periphery of the housing on the other end surface side of the bearing.

In the bearing mounting structure having such a structure, once the bearing is fitted on the inner periphery of the housing, the bearing is axially moved by the projection formed on the inner periphery of the housing. Since the movement is hindered, there is an effect that it is more securely fixed as compared with the conventional press-fit only fitting.

According to a second aspect of the present invention, in the bearing mounting structure according to the first aspect, an inner diameter formed by the projection on an inner periphery of the housing is larger than an outer diameter of the bearing in an entire temperature range in which the bearing is used. The bearing mounting structure is characterized by being small.

In the bearing mounting structure having such a structure, once the bearing is fitted on the inner periphery of the housing, the protrusion is formed on the inner periphery of the housing over the entire temperature range in which the bearing is used. Since the inner diameter of the bearing is smaller than the outer diameter of the bearing, the bearing passes through the projection and moves in the axial direction even when the temperature differs from the mounting time during use and the dimensional change of the housing and the bearing occurs. There is an excellent effect that it is securely fixed without being lost.

According to a third aspect of the present invention, there is provided a shaft provided with a bearing, a stopper fitted on the inner periphery and having a stopper for receiving one end face of the bearing in the axial direction, and the bearing fitted on the outer periphery. A bearing mounting structure comprising a combined housing, wherein a projection is integrally formed on the outer periphery of the shaft on the other end surface side of the bearing.

In the bearing mounting structure having such a structure, once the bearing is fitted on the outer periphery of the shaft, the bearing is moved in the axial direction by the projections formed on the outer periphery of the shaft. Since it is hindered, there is an effect that it is more securely fixed as compared with the conventional press-fit only fitting.

According to a fourth aspect of the present invention, in the bearing mounting structure according to the third aspect, the outer diameter formed by the projection on the outer periphery of the shaft is larger than the inner diameter of the bearing over the entire temperature range of use. It is a bearing mounting structure characterized by the above.

In the bearing mounting structure having such a structure, once the bearing is fitted to the outer periphery of the shaft, the protrusion is formed on the outer periphery of the shaft over the entire temperature range in which the bearing is used. Since the diameter is larger than the inner diameter of the bearing, the temperature of the shaft differs from that of the bearing during use, and even if the dimensions of the shaft and the bearing change, the bearing gets over the protrusion and moves in the axial direction. And has an excellent effect of being securely fixed.

According to a fifth aspect of the present invention, there is provided a method for assembling a bearing mounting structure in which a bearing is fitted to an inner periphery of a housing having a projection. And mounting the bearing by inserting the bearing in the axial direction up to a stopper provided on the inner periphery of the housing.

According to such a method of assembling the bearing mounting structure, since the temperature of the housing is higher than that of the bearing, the inner diameter of the projection is larger or smaller than the outer diameter of the bearing. Since the difference is smaller than at the same temperature, there is an excellent effect that the bearing can be more smoothly incorporated into the housing.

According to a sixth aspect of the present invention, in the method of assembling a bearing mounting structure for fitting a bearing to an outer periphery of a shaft having a projection, the temperature of the bearing is set higher than that of the shaft.
A method of assembling a bearing mounting structure, wherein the method is characterized in that the bearing is assembled by inserting the bearing in the axial direction past a protrusion to a stopper provided on the outer periphery of the shaft.

According to such a mounting method of the bearing mounting structure, since the temperature of the bearing is higher than that of the shaft, the inner diameter of the bearing is larger or smaller than the outer diameter formed by the projection. Since the difference is smaller than at the same temperature, there is an excellent effect that the bearing can be incorporated into the shaft more smoothly.

As described above, a bearing mounting structure for securely fixing a bearing without increasing the number of parts and a method of assembling the bearing are obtained, thereby achieving the object of the present invention.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A bearing mounting structure according to a first embodiment of the present invention will be described with reference to FIG. A valve shaft (hereinafter referred to as a shaft) 20 connected to an intermediate shaft (not shown) is rotatably supported by a control valve housing (hereinafter referred to as a housing) 10 via a bearing 30 near an upper portion of FIG. ing. The rolling element of the bearing 30 used here is a ball, but this is not necessarily limited to the ball, and may be another type such as a roller or a conical roller.

The shaft 20 has a cylindrical shape, and a torsion bar 25 extends in the axial direction on the inner periphery. The upper end of the torsion bar 25 is fixedly connected to the shaft 20 by the first pin 22, and the lower end is fixedly connected to the pinion shaft 60 by the second pin 62. The upper end of the rack housing 40 is fitted to the lower end of the housing 10, and a vertical column-shaped cavity and a cavity extending in the vertical direction on the paper surface of FIG. . The pinion shaft 60 is supported by the rack housing 40 via upper and lower bearings 35 and 36, and a pinion formed below the pinion shaft 60 is fitted to the rack 70. When the pinion shaft 60 rotates, the rack 70 moves in a direction perpendicular to the plane of FIG.

Therefore, when the driver rotates the steering wheel (not shown), the main shaft and intermediate shaft (not shown) are rotated, and the shaft 20 shown in FIG. 3 is rotated. Then the shaft 20
The torsion bar 25 connected via a first pin 22 rotates the pinion shaft 60 via a second pin 62 at the lower end, and this rotational force moves the rack 70 up and down in a direction perpendicular to the plane of FIG. By doing so, a knuckle (not shown) connected to the rack 70 is rotated to change the direction of the wheel, thereby fulfilling the steering function.

A cylindrical control valve 50 is fixedly connected to the pinion shaft 60 by a third pin 63, and covers the shaft 20 from the outer periphery. Since the torsion bar 25 is interposed between the shaft 20 and the pinion shaft 60, the torsion bar is twisted when a force for relatively rotating the shaft 20 and the pinion shaft 60 acts. As a result, the control valve 50 and the shaft 20 connected to the pinion shaft 60 slightly rotate in the rotation direction. The power steering device is controlled by controlling the hydraulic pressure by using the relative rotation to increase the moving force of the rack 70, but a detailed description of the hydraulic control is directly given to the gist of the present invention. The description is omitted because it does not matter.

In FIG. 1, the bearing 30 includes an outer race 31, an inner race 32, a plurality of balls 33, and a cage. The outer ring 31 is pressed into the bearing mounting portion 12 adjacent to the stopper 11 on the inner periphery of the housing 10,
The movement to the left in FIG. 1 in the axial direction is stopped by a stopper 11 formed integrally with the housing 10. The shaft 20 and the inner ring 32 of the bearing 30 are mounted in a clearance fit or an intermediate fit at room temperature. An oil seal 80 is fitted to the housing 10 on the left side of the bearing 30, so that the shaft 20 can rotate freely. However, it prevents oil in the housing from flowing out and prevents foreign matter such as dust from entering from outside. I'm preventing.

The difference from the prior art shown in FIG. 4 is that the housing 10 has a stopper 11 for receiving the bearing 30 and a projection 15 on the opposite side of the bearing 30.
(In FIGS. 1 and 3, the protrusion height of the protrusion 15 is exaggerated.) The protrusion 15 is formed on the cylindrical inner periphery of the housing 10. A protrusion may be formed so as to have an inner diameter smaller than the outer diameter of the bearing 30 at a predetermined width in the axial direction over the entire circumference, or a plurality of protrusions may be formed so as to be uneven over one circumference. And the inner diameter of the projections
May be formed so as to be smaller than the outer diameter. Further, the projection may be formed at only one place. In FIG. 1, on the right side of the protrusion 15, the inner diameter of the hollow portion on the inner circumference of the housing 10 is larger than the outer diameter of the bearing 30. Therefore, when the bearing 30 is inserted into the housing 10, the bearing 30 can be smoothly moved without being hindered by the housing 10 at least until the bearing 30 comes into contact with the projection 15. The bearing mounting structure having such a structure is included in the structure of the first aspect.

A method of assembling the bearing 30 having the above-described bearing mounting structure to the housing 10 will be described. First, the oil seal 80 is attached to the housing 10, and then the outer ring 31, the ball 33, the cage 34, and the inner ring 3
2 is inserted from the right side in FIG. 1 and moved to the left. When the bearing 30 reaches the right end of the projection 15, the outer ring 31 is hindered by the projection 15 and cannot move further left as it is. However, if a larger load is applied here to move the bearing 30 to the left, the projection 15 elastically deforms to expand the inner diameter and expand to the outer diameter of the bearing 30, so that the protrusion 15 is pressed into the left as it is. You can go. Then, when the inner diameter of the housing exceeds the protrusion 15, the inner diameter of the inner circumference of the housing reaches the slightly enlarged bearing mounting portion 12, and even if the housing is to be moved further to the left,
The stopper 11 prevents the outer ring 31 from moving in the axial direction.

The height h at which the projections 15 protrude from the outer diameter of the bearing 30 is represented by D, the outer diameter of the bearing at room temperature.
Assuming that the inner diameter of the inner circumference formed by the projection 15 is L, h = (DL) / 2 (1). Here, how much h is required for the above-described elastic deformation and smooth insertion. Calculate whether it is necessary to set it to the value of In order to replace the model with a simple model, assuming that the annulus having the inner diameter L is expanded and is extended by ΔL in diameter, the strain ε generated at this time is ε = (π × ΔL) / (π × L) = ΔL / L (2) When the longitudinal modulus of elasticity is E between the stress σ and the strain ε, σ = E × ε (3) holds. Therefore, from the equations (2) and (3), ΔL = σ × L / E (4) is derived. Here, if the material of the housing 10 is aluminum, the longitudinal elastic modulus E = 7.06 × 10000MP
a, and the elastic deformation limit stress of aluminum is σ =
Since these values are 102.9 MPa, when these values are substituted into Expression (4), ΔL = 0.00146 × L (5) Since ΔL is a value corresponding to the diameter, the height h of the projection 15
Is 1/2 of that, and h = 0.0073 × L (6). If L = 40 mm, h becomes 0.03 mm from the equation (6). In other words, if the projection has a height of 0.03 mm or less, even if the bearing 30 is inserted over the projection 15, it is within the elastic deformation, and after the insertion, it returns to the original inner diameter. However, since it is difficult to manufacture with such accuracy due to processing accuracy, when the height h of the projection 15 is slightly increased, that is, when the inner diameter L is reduced, the tip of the projection 15 is partially plasticized by inserting the bearing 30. Deformation occurs, but a height equal to or higher than the elastic deformation limit of 0.03 is secured. Therefore, once the bearing 30
Is fixed at a predetermined position, there is an effect that the bearing 30 is more securely fixed to the housing 10 as compared with the conventional structure having no projection.

Further, in securely fixing and holding the bearing 30, there is no need to provide a special part such as a snap ring, so that there is an effect that it can be constructed at a low cost and can be easily assembled.

In the conventional structure, when the bearing 130 is prevented from slipping in the axial direction as much as possible, the fitting between the bearing 130 and the housing 110 is tightly fitted to increase the press fitting allowance. The rotation torque increases,
The smoothness of rotation of the shaft 120 will be impaired. However, in the bearing mounting structure of the first embodiment, such a situation does not occur, and the protrusion 15 reliably prevents the bearing 30 from sliding out. Therefore, the fitting between the bearing mounting portion 12 and the bearing 30 is a conventional structure. As a result, the shaft 20 can rotate smoothly. This is an effect that is particularly noticeable at low temperatures.

In order to allow the bearing 30 to be inserted more smoothly when it is inserted over the projection 15 formed on the housing 10, for example, in FIG. You may devise to gradually increase the height of the protrusion by hanging on the left end. Alternatively, it is also effective to bevel the right end or to make the projection a curved cross section.

The above is the assembly at normal temperature.
As described above, when the bearing 30 is inserted, the projection 15 of the housing 10 is elastically deformed, or in some cases, plastically deforms a part thereof. Therefore, if the housing 10 is heated to a higher temperature with respect to the bearing 30 when assembling, the housing 10 expands more than the bearing 30 due to thermal expansion.
Is larger or smaller than the outer diameter D of the bearing 30, the difference can be made smaller, so that the insertion becomes smoother. There are two ways to provide a difference in temperature: a method in which the housing 10 is heated above room temperature to thermally expand the housing 10 and a method in which the bearing 30 is made lower than room temperature but rather contracted. You just have to choose. This mounting method is included in the method described in claim 5.

Next, since the temperature environment in which such a structure is used is not always under a constant condition, the structure in which the bearing 30 is fixed to the housing 10 and does not slide out in the used temperature range. Explain what is possible. Assuming that the linear expansion coefficient of the housing 10 is α and the linear expansion coefficient of the bearing is β, the temperature at the time of assembly is 2
Assuming that the temperature is 0 ° C., when the temperature at which the bearing mounting structure is used is t ° C., the outer diameter D of the bearing 30 and the inner diameter L of the projection 15 are expanded and expanded, respectively, to obtain Dt and Lt. Which is expressed by the following equation. Lt = {1+ (t−20) α} × L (7) Dt = {1+ (t−20) β} × D (8) In order for the bearing 30 not to slide in the axial direction, Lt <Dt (9) ) Should be satisfied. If the linear expansion coefficient α of the material of the housing 10 is relatively large as compared with the linear expansion coefficient β of the material of the bearing 30, when the temperature rises, Lt becomes Dt from the equations (7) and (8). Since it is relatively large, there is a concern that equation (9) does not hold. However, by forming the projections 15 having an appropriate height h, it is necessary to state that the projections 15 do not slide out over the entire temperature range used. Shown in

If the material of the housing 10 is made of aluminum and the material of the bearing 30 is made of bearing steel, α = 0.000023 and β = 0.0000117, as in the case described above. Since the temperature is 120 ° C. in the case of the power steering device shown in FIG.
= 120 into the equations (7), (8) and (9), and L <
0.999D is obtained. From this and equation (1), h> 0.0005 × D (10) is obtained. Therefore, assuming that the outer diameter of the bearing 30 at a normal temperature of 20 ° C. is 40 mm, if the height of the projection 15 is 0.02 mm or more, the bearing 30 does not slide out of the projection 15 over the entire temperature range. It is securely held. (In this case, the temperature at the time of assembling is set to 20 ° C. However, even if the temperature is higher or lower, the limit value of the height of the projection 15 is slightly different. Is securely held by the housing 10 so that it does not slip out of the housing.) As described above, when the outer diameter of the bearing 40 is about 40 mm, the height of the projection is set to 0.
The bearing 30 may be inserted at room temperature up to 03 mm, which is an elastic deformation range, or the temperature of the housing 10 may be higher than that of the bearing 30 for smooth assembly. In this way, it is possible to provide a structure in which dimensional specifications are assured over the entire temperature range used, and this structure is included in the structure described in claim 2.

FIG. 2 is a sectional view showing a bearing mounting structure according to the second embodiment. In this case, unlike the first embodiment, the structure is such that the bearing 30 is fitted not on the housing 10a side but on the shaft 20a side. Bearing 30
The outer diameter of the shaft 20a is on the left side of the inner ring 3 of the bearing 30.
2 is formed to be larger than the outer diameter of the bearing mounting portion 22a in which the inner circumference fits to form a stopper 21a. Bearing 3
On the right side of 0, a protrusion 25a having an outer diameter larger than the outer diameter of the bearing mounting portion 22a (the height of the protrusion in FIG. 2 is exaggerated in FIG. Is drawn) is the shaft 20
It is formed as a plurality of protrusions that are continuously or unevenly formed by a predetermined width in the axial direction over the entire circumference of “a”. However, the protrusion 25a may be a protrusion at only one place. In FIG. 2, the right shaft 20a of the projection 25a is shown.
Is not only smaller than the outer diameter La of the projection 25a,
It is set smaller than the inner diameter Da of the bearing 30. Therefore, when the bearing 30 is inserted into the shaft 20a, the bearing 30 can move smoothly without being hindered by the shaft 20a at least until it comes into contact with the projection 25a. The fit between the outer ring 31 of the bearing 30 and the housing 10a is a clearance fit or an intermediate fit.

Also in the second embodiment having such a structure, the bearing 30 is inserted from the right side in FIG.
If the bearing 30 is fitted into the bearing mounting portion 22a after passing through 5a and stopped by the stopper 21a, the bearing 30 is securely fixed to the shaft 20a and does not slide out. Claim 3 describes this structure.

In the bearing mounting structure of the second embodiment, generally, the material of the bearing 30 and the shaft 20a is usually a steel material. Since it does not become so easy to come out due to the temperature change, it is possible to prevent the protrusion from slipping sufficiently at the height of the projection lower than the relationship between aluminum and steel as exemplified in the first embodiment. A structure in which the bearing 30 is prevented from slipping out by making the outer diameter formed by the projection 25a provided on the outer periphery of the shaft 20a larger than the inner diameter of the bearing 30 over the entire temperature range of use. 4 included.

The method of assembling the bearing mounting structure according to the second embodiment may be carried out at room temperature. However, in order to facilitate the assembling, the temperature of the bearing 30 is set higher than that of the shaft 20a.
The method of inserting the 0 ’into the shaft 20a and assembling the 0’ is included in claim 6. Since the effects of these are the same as those described in the first embodiment, a detailed description is omitted, but the bearing 30 can be securely fixed to the shaft 20a in the same manner.

Also in the case of the second embodiment shown in FIG. 2, as described in the description of the first embodiment, the bearing 30 is used.
In order to make the insertion smoother, the outer diameter of the projection 25 on the outer periphery of the projection 25a is gradually increased toward the left end of FIG. 2 from the outer diameter of the right end. You may make it bigger.

Since the bearing mounting structure shown in FIG. 1 is assumed to be applied to the steering device shown in FIG. 3, the shaft 20a rotates and the housing 10a is fixed, but this is not necessarily limited. In the bearing mounting structure according to the second embodiment shown in FIG. 2, the shaft 20a is fixed and the housing 10a
The present invention is applied to a case where the side rotates. In that case, the material of the shaft 20a may be aluminum. If the shaft 20a is made of aluminum and the bearing 30 is made of steel, when the temperature rises, the bearing 30 is tightly fitted and hardly slips out. However, even in such a case, the projections 25a work effectively, so that the bearing 30 does not slip out and can be appropriately set so that the fitting at the bearing mounting portion 22a is not tight, so that the rotation of the housing 10a is smooth. The effect that can be maintained is not lost as before.

[Brief description of the drawings]

FIG. 1 is a sectional view of a bearing mounting structure according to a first embodiment of the present invention, and is an enlarged view showing a part of FIG. 3;

FIG. 2 is a sectional view of a bearing mounting structure according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating a control valve of a steering device on which the bearing mounting structure according to the first embodiment of the present invention is mounted and the vicinity thereof.

FIG. 4 is a cross-sectional view showing a conventional bearing mounting structure.

FIG. 5 is a cross-sectional view showing a control valve of a steering device equipped with a conventional bearing mounting structure and its vicinity.

[Explanation of symbols]

10, 10a, 110 ... housing (control valve housing) 11, 111 ... stopper 12, 112 ... bearing mounting part 20, 20a, 120 ... shaft (valve shaft) 22, 122 ... No. 1 pin 25, 125 ... torsion bar 30, 35, 36, 130, 135, 136 ... bearing 31, 131 ... outer ring 32, 132 ... inner ring 33, 133 ... ball 34, 134 ..Cages 40, 140 ... Rack housings 50, 150 ... Control valves 60, 160 ... Pinion shafts 62, 162 ... Second pins 63, 163 ... Third pins 70, 170 ...・ Rack 80, 180 ・ ・ ・ Oil seal

Claims (6)

[Claims] 1. A housing comprising a bearing, a housing fitted with an outer periphery and having a stopper for receiving one end face of the bearing in an axial direction, and a shaft fitted with an inner periphery of the bearing. A bearing mounting structure, wherein a projection is integrally formed on the inner periphery of the housing on the other end surface side of the bearing. 2. The bearing mounting structure according to claim 1, wherein an inner diameter of the projection formed on the inner periphery of the housing is smaller than an outer diameter of the bearing over the entire temperature range of use. Mounting structure. 3. A bearing comprising: a shaft provided with a stopper in which the bearing is fitted on the inner periphery and which receives one end face of the bearing in the axial direction; and a housing in which the bearing is fitted on the outer periphery. A bearing mounting structure according to claim 1, wherein a projection is integrally formed on the outer periphery of said shaft on the other end surface side of said bearing. 4. The bearing mounting structure according to claim 3, wherein the outer diameter formed by the projection on the outer periphery of the shaft is larger than the inner diameter of the bearing over the entire temperature range in which the bearing is used. Construction. 5. A method of assembling a bearing mounting structure in which a bearing is fitted to an inner periphery of a housing having a projection, wherein the housing is heated to a temperature higher than that of the bearing, the bearing is passed through the projection, and the bearing is mounted on the housing. A method for assembling a bearing mounting structure, comprising: inserting a stopper in an axial direction up to a stopper provided on an inner circumference of the bearing. 6. A method of assembling a bearing mounting structure in which a bearing is fitted to an outer periphery of a shaft having a projection, wherein the temperature of the bearing is higher than that of the shaft, the bearing is passed over the projection,
A method of assembling a bearing mounting structure, wherein the bearing is assembled by inserting the bearing axially up to a stopper provided on the outer periphery of the shaft.