JP2000006828A - Bearing assembly method of control valve for power steering device and bearing fixing nut for steering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing assembly method of a control valve for a power steering device capable of improving a valve characteristic. SOLUTION: A pair of an upper needle bearing 40 and a lower needle bearing 42 is interposed between a valve shaft 14 and a valve body 28 of a control valve 10. Cage dividing parts 48, 52 of these needle bearings 40, 42 are assembled so as to be at the same angle seen in the axial direction of the valve shaft 14. Consequently, even when lateral force works on the valve shaft 14, both of the cage dividing parts 48, 52 never open, and it is possible to reduce frictional force with the valve body 28. Accordingly, it is possible to improve a valve characteristic of the control valve 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling a bearing of a control valve for a power steering device and a bearing fixing nut for a steering device.

[0002]

2. Description of the Related Art An example of the configuration of a control valve of a conventional rack and pinion type power steering apparatus will be briefly described.
The control valve has a valve pinion with an integrated valve body, a hollow valve shaft inserted into the shaft core of the valve pinion, and a fixed valve inserted into the valve shaft and fixed to the valve pinion. And a torsion bar fitted with splines.

When a driver rotates a steering wheel, a valve shaft is rotated via a steering main shaft, an intermediate shaft, and the like. Therefore, the valve pinion rotates via the torsion bar, and the rack bar is moved to change the steering angle. At this time, when the torsion bar is twisted with respect to the valve pinion, the valve shaft rotates extra by the amount of the twist, and a hydraulic pressure difference is generated between the right chamber and the left chamber of the power cylinder. As a result, the steering force by the driver is assisted.

By the way, a pair of needle bearings are vertically spaced between the valve shaft and the valve body of the valve pinion in order to smoothly rotate the valve shaft relative to the valve body. . These needle bearings have the same configuration, and the cage is divided at one location on the circumference for assembly reasons. For this reason, as shown in FIG. 6, the needle bearing 100 arranged on the upper side
(See FIG. 1A) Divided portion 10 of cage 102
4 and the divided portion 110 of the cage 108 in the needle bearing 106 (see FIG. 3B) arranged on the lower side may be assembled to the valve shaft 112 with a deviation of exactly 180 degrees.

[0005] In such a case, a lateral force (a force that swings the valve shaft 112) acts on the valve shaft 112 from the yoke side of the universal joint serving as a connection portion with the intermediate shaft during steering.
When the direction of the lateral force matches the direction of the divided portion 104 of the cage 102 of the needle bearing 100 disposed on the upper side and the divided portion 110 of the cage 108 of the needle bearing 106 disposed on the lower side, both divided portions 10
It is conceivable that the end portions of the cages 102 and 108 come into direct contact with the valve body 114 when the terminals 4 and 110 are opened. In particular, the divisions 104, 11 of the cages 102, 108
The pitch of the portion where 0 is set is larger than the pitch of the other portions, and the cages 102 and 108 themselves have the divided portion 104,
Since a structure for holding the cage 110 is not provided, the fact that the cages 102 and 108 can be easily opened by the divided parts 104 and 108 is also a factor. In this case, the frictional force (surface pressure) between the valve shaft 112 and the valve body 114 increases, and the increase in the frictional force causes torque fluctuation. Therefore, it is not preferable in terms of valve characteristics of the control valve.

On the other hand, there is the following problem. That is,
The valve pinion of the above-described control valve is rotatably supported by the gear box housing by bearings disposed at two locations, upper and lower, on the valve body side and the pinion side. Further, a bearing fixing nut is screwed into the upper end of the valve body so that the bearing on the valve body side does not come off.

Here, as shown in FIG. 7A, the outer periphery of the bearing fixing nut 116 is
One notch 118 is formed, and the bearing fixing nut 116 is tightened by using a special tool having a projection engageable with the notch 118.

However, the bearing fixing nut 11
The inner and outer diameters of 6 are limited to the upper limit of the component layout, and cannot be made thick enough to obtain sufficient rigidity.
In addition, since the four notches 118 are formed in the outer peripheral portion of the bearing fixing nut 116, the weakest portion in the cross direction is formed. For these reasons, when the bearing fixing nut 116 having the above configuration is tightened, a stress imbalance occurs due to the tightening torque, and the bearing fixing nut 116 may be deformed into a substantially elliptical shape as shown in FIG. 7B. There is. In this case, the valve body 114 which is a hollow member may be deformed, and the roundness of the valve body 114 may be deteriorated. Valve body 114
If the roundness of the valve body deteriorates, the frictional force between the valve body 114 and the valve shaft 112 increases, causing torque fluctuation as described above. Therefore, it is not preferable in terms of valve characteristics of the control valve.

The present invention has been made in view of the above circumstances, and has as its object to provide a method of assembling a bearing for a control valve for a power steering apparatus and a bearing fixing nut for a steering apparatus, which can improve valve characteristics.

[0010]

According to a first aspect of the present invention, there is provided a valve body having a plurality of hydraulic control ports formed in a peripheral wall and having a hollow shaft portion, and a torsion disposed in the shaft portion. Including a valve shaft connected to the bar and arranged in a state inserted into the hollow shaft core of the valve body, a plurality of rolling elements, and a cage holding these rolling elements and divided at at least one location in the circumferential direction. A plurality of bearings, each of which is arranged at a plurality of locations in the axial direction of the valve shaft, for supporting the valve shaft so as to be rotatable relative to the valve body. A bearing assembling method applied when assembling the plurality of bearings to the valve shaft,
When viewed in the axial direction of the valve shaft, the angle between the cage split portion of the bearing disposed on the input direction side and the cage split portion of the bearing disposed on the output direction side is 180 °.
It is characterized in that these bearings are mounted on the valve shaft so as to have an angle other than degrees.

According to a second aspect of the present invention, a method for assembling a bearing for a control valve for a power steering apparatus according to the present invention is provided in the first aspect, wherein the control valve is disposed on an input side when viewed in an axial direction of a valve shaft. These bearings are assembled to the valve shaft such that the angle formed between the cage divided portion of the bearing and the cage divided portion of the bearing arranged on the output direction side is 0 degree.

According to a third aspect of the present invention, there is provided an output shaft which is interposed between an output shaft which rotates around an axis by a steering input and transmits the steering input to a steering output side and a gearbox housing which accommodates the output shaft. Bearing fixing nut for a steering device for fixing a bearing rotatably supporting a gear box housing to an output shaft, wherein a multiple of three engaging recesses are formed at equal intervals on an outer peripheral portion of the nut body. It is characterized by that.

According to the first aspect of the present invention, when the bearing is assembled to the valve shaft, when viewed in the axial direction of the valve shaft, the cage divided portion of the bearing disposed on the input direction side and the output direction side. Are mounted so that the angle formed between the bearing and the cage divided portion is an angle other than 180 degrees. For this reason, even if a lateral force acts on the valve shaft during steering, both the cage division of the bearing on the input side and the cage division of the bearing on the output side will not be located on the lateral direction of action of the lateral force. . Therefore, even if one of the cage part on the input side and the cage part on the output side opens and comes into contact with the valve body due to the lateral force acting on the valve shaft, both of them open and come into contact with the valve body. The frictional force between the valve shaft and the valve body is reduced as compared with the case where the contact is made. Therefore, torque fluctuation due to the frictional force is also reduced. According to the second aspect of the present invention, in the first aspect of the invention, when viewed in the axial direction of the valve shaft, the bearing is disposed on the input direction side and is disposed on the output direction side. These bearings are assembled to the valve shaft such that the angle between the bearing and the cage division is 0 degree. That is, the present invention can be said to be a special mode of the invention described in claim 1.

[0014] In this way, the two parts are assembled so that the angle between the two parts is zero (ie, the two parts overlap when viewed in the axial direction of the valve shaft). If this is the case, mechanical assembly can be easily performed. For example, it is detected in advance by a sensor or the like whether or not the positions of the cage divided portion of the bearing disposed on the input direction side and the cage divided portion of the bearing disposed on the output direction side match, and it is determined that they match. When the detection signal is obtained, a method of mechanically assembling the bearing on the input direction side and the output direction side of the valve shaft can be adopted.

According to the third aspect of the present invention, the bearing is provided between the output shaft that rotates around the axis by the steering input and transmits the steering input to the steering output side, and the gear box housing that houses the output shaft. Intervened. With this bearing, the output shaft is rotatably supported with respect to the gear box housing. Further, such a bearing is fixed to the output shaft by screwing a bearing fixing nut for a steering device to the output shaft.

Here, in the present invention, a multiple of three engaging recesses are formed at equal intervals on the outer periphery of the nut body of the bearing fixing nut for the steering device, so that the bearing fixing nut is tightened using a tool. The resulting deformation mode becomes substantially triangular. Therefore, for example, when four engaging concave portions are provided at 90-degree intervals, the weakest portion is formed in the cross direction, so that the deformation mode becomes substantially elliptical, and the deformation amount increases. According to the invention, since the deformation mode is substantially triangular, the amount of deformation can be suppressed.

Therefore, for example, when the bearing fixing nut according to the present invention is used for fixing the bearing of a control valve for a power steering device, the roundness of the valve body is not deteriorated, and the valve body and the valve shaft are not deteriorated. Is reduced. Therefore, torque fluctuation due to the frictional force is also reduced.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A first embodiment of the present invention will be described below with reference to FIGS.

FIG. 3 shows a longitudinal sectional structure of a control valve 10 for a rack and pinion type power steering device. As shown in this figure, the control valve 10 is configured by coaxially disposing axial members such as a valve pinion 12, a valve shaft 14, and a torsion bar 16.

The valve pinion 12 is a shaft-like member having a hollow inside and has a plurality of hydraulic control ports 18 to 2 on its peripheral wall.
4 is formed, and a pinion shaft 30 formed integrally with the lower end of the valve body 28 and having teeth formed on the outer peripheral portion.
The ports 18 to 24 in the valve body 28
Seal rings 32 are fitted on both upper and lower sides of the seal ring.

The valve shaft 14 is inserted into the shaft core of the valve body 28 in the valve pinion 12 having the above-described structure. The valve shaft 14 is formed as a hollow shaft-shaped member, and the upper end is connected to the intermediate shaft via a universal joint. The intermediate shaft is connected to a steering wheel to which a steering force is input via a steering main shaft.

Further, the shaft core of the valve shaft 14
The torsion bar 16 is inserted. The upper end of the torsion bar 16 and the upper end of the valve shaft 14 are mutually connected by a fixing pin 34 penetrating them in the radial direction. The lower end of the torsion bar 16 is spline-fitted to the pinion shaft 30 of the valve pinion 12. Note that, instead of the spline fitting, another coupling structure (for example, fixing with a pin) may be employed.

The above-described control valve 10 is accommodated in a steering gear box housing (not shown) so as to be rotatably supported via a bearing. When the control valve 10 is housed in the steering gear box housing, the pinion shaft 30
Teeth are meshed with the rack bar teeth.

Therefore, when a steering wheel (not shown) is rotated, the valve shaft 14 is rotated around the axis via the steering main shaft, the intermediate shaft, etc., whereby the valve pinion 12 is rotated via the torsion bar 16. The rack bar is moved linearly to change the steering angle. At this time, when the torsion bar 16 is twisted with respect to the valve pinion 12, the valve shaft 14 rotates extra by the amount of the twist, and a hydraulic pressure difference is generated between the right chamber and the left chamber of the power cylinder. To assist the steering force of the steering wheel.

Annular concave portions 36 and 38 are formed in the intermediate portion and lower end portion of the valve shaft 14 in the axial direction, respectively. An upper needle bearing 40 and a lower needle bearing 42 as “bearings” according to claim 1 and 2 are provided in these recesses 36 and 38.
Are arranged in a fitted state. It should be noted that the needle bearings 40, 42 are not used in other types of bearings.
Is used in order to avoid an increase in the radial size.

FIG. 2 shows an upper needle bearing 40.
Are shown in a front view and a partially cutaway plan view. As shown in these figures, the upper needle bearing 40
The main components are a plurality of rollers (needle) 44 as “rolling elements” arranged at predetermined intervals, and annular cages 46 arranged vertically to hold these rollers 44. ing. The annular cage 46 is made of resin and is divided at one location in the circumferential direction (hereinafter, referred to as a cage).
This divided part is referred to as “cage dividing part 48”. The plurality of rollers 44 are basically arranged at the same pitch, but the pitch is slightly increased only on both sides of the cage dividing portion 48. In FIG. 2 (B), the hatching direction is reversed so that the cage divided portion 48 can be easily understood.

On the other hand, the lower needle bearing 42 is configured similarly to the upper needle bearing 40,
A pair of upper and lower cages 54 each having a plurality of rollers 50 as “rolling elements” and a cage dividing portion 52 at one location in the circumferential direction are configured as main components (FIG. 1B and FIG. 3).
reference).

Here, in the present embodiment, FIG.
As shown in (B), when viewed in the axial direction of the valve shaft 14, the cage dividing portion 48 of the upper needle bearing 40 disposed on the input side of the steering force and the lower needle bearing 42 disposed on the output side thereof. Cage split part 5
The needle bearings 40 and 42 are mounted on the valve shaft 14 so that the angle between the needle bearings 2 and 0 is 0 degrees (that is, the two bearings overlap).

Next, the operation and effect of this embodiment will be described.

The upper needle bearing 40 and the lower needle bearing 42 according to this embodiment are assembled to the valve shaft 14 in the following manner.

Assuming that the upper needle bearing 40 is first attached to the valve shaft 14, first, a resin cage 46 is set to the outermost diameter of the valve shaft 14.
Is expanded by elastic deformation. Next, in this state, the upper needle bearing 40 is inserted into the concave portion 36 on the upper side of the valve shaft 14 and fitted into the concave portion 36.

Since the lower needle bearing 42 is configured similarly to the upper needle bearing 40,
In a similar manner, the valve shaft 14 is fitted into the lower recess 38 of the valve shaft 14.

At this time, when viewed in the axial direction of the valve shaft 14, the upper needle bearing 40 on the input direction side
So that the angle between the cage division 48 of the lower needle bearing 42 on the output direction side and the cage division 48 of the lower needle bearing 42 becomes the same angle (0 degrees in the present embodiment). These needle bearings 40,
42 is attached to the valve shaft 14.

After the assembling work of the upper needle bearing 40 and the lower needle bearing 42 to the valve shaft 14 is completed as described above, the valve shaft 14 is moved to the valve pinion 12 with the torsion bar 16 being sub-assembled. The valve body 28 is inserted and assembled. Thereby, the torsion bar 16
Is spline-fitted to the valve pinion 12, and the roller 44 of the upper needle bearing 40 and the roller 50 of the lower needle bearing 42 are pressed against the inner peripheral surface of the valve body 28.

The control valve 10 thus constructed is then assembled into a gear box housing (not shown) so that the pinion shaft 30 of the valve pinion 12 and the rack bar are engaged.

Here, a lateral force (indicated by an arrow F in FIG. 3) is applied to the valve shaft 14 of the control valve 10 assembled as described above from the intermediate shaft side via the yoke of the universal joint during steering. Shown) may act.

However, in the present embodiment, when viewed in the axial direction of the valve shaft 14, the cage dividing portion 48 of the upper needle bearing 40 on the input direction side and the cage dividing portion 48 of the lower needle bearing 42 on the output direction side.
The upper needle bearing 40 and the lower needle bearing 42 are assembled to the valve shaft 14 so that the angle formed by the valve shaft 14 and the lower needle bearing 42 is the same angle (0 degrees in the present embodiment). , Both the cage division 48 of the upper needle bearing 40 and the cage division 52 of the lower needle bearing 42 are not located on the line of the lateral force acting direction.

Therefore, due to the lateral force F acting on the valve shaft 14, one of the input-side cage dividing portion 48 and the output-side cage dividing portion 52 is opened and comes into contact with the inner peripheral surface of the valve body 28. Even if it does, the frictional force between the valve shaft 14 and the valve body 28 is reduced as compared with the case where both of them are opened and come into contact with the inner peripheral surface of the valve body 28. Therefore, when the driver turns the steering wheel to the right or left, the valve shaft 14 can be smoothly rotated relative to the valve body 28. Accordingly, torque fluctuation due to the frictional force can be reduced. As a result, according to the present embodiment, the valve characteristics can be improved.

Further, as described above, since the frictional force between the valve shaft 14 and the valve body 28 can be reduced, the feeling of friction felt by the driver at the time of steering can be reduced. Rings can also be improved.

Further, in the present embodiment, when viewed in the axial direction of the valve shaft 14, the cage divided portion 48 of the upper needle bearing 40 disposed on the input direction side and the lower needle bearing 42 disposed on the output direction side. Since the upper needle bearing 40 and the lower needle bearing 42 are assembled to the valve shaft 14 so that the angle formed by the cage dividing portion 52 becomes 0 degree, mechanical assembly can be easily performed. Become. For example, it is detected in advance by a sensor or the like whether or not the positions of the cage division 48 of the upper needle bearing 40 arranged on the input direction side and the cage division 52 of the lower needle bearing 42 arranged on the output direction match. Then, when a detection signal indicating that they match is obtained, the upper needle bearing 40 and the lower needle bearing 42
May be mechanically assembled on the input direction side and output direction side of the valve shaft 14. As a result, automation of assembly can be promoted.

In addition, as described above, the valve shaft 1
The lateral force F acting on the steering wheel 4 at the time of steering enters from the yoke side of the universal joint which is a connection point with the intermediate shaft. Is determined, the lateral force F acts by adjusting the assembling position of the yoke and the assembling positions of the cage dividing portion 48 of the upper needle bearing 40 and the cage dividing portion 52 of the lower needle bearing 42. Roller 4 when you do
It is also possible to make the valve bodies 4 and 50 hit the valve body 28, so that the relative rotation of the valve shaft 14 with respect to the valve body 28 can be further smoothed.

In this embodiment, the upper needle bearing 40 and the lower needle bearing 42 are divided at one location in the circumferential direction. However, the present invention is not limited to this. You may.

In this embodiment, one upper needle bearing 40 is arranged on the input side and one lower needle bearing 42 is arranged on the output side. However, the present invention is not limited to this. Any configuration may be used as long as a plurality of bearings are arranged. A configuration in which two or more bearings are arranged on one of the input direction side and the output direction side may be adopted, or both the input direction side and the output direction side may be adopted. A configuration may be adopted in which two or more bearings are arranged on the vehicle.

Further, in the present embodiment, when viewed in the axial direction of the valve shaft 14, the cage dividing portion 48 of the upper needle bearing 40 arranged on the input side and the lower needle bearing 42 arranged on the output side. The needle bearings 40 and 42 are assembled to the valve shaft 14 so that the angle between the cage divisions 52 and the cage divisions 52 becomes 0 degree. However, the present invention is not limited thereto. Any configuration may be used as long as these needle bearings 40 and 42 are assembled to the valve shaft 14 so that the formed angle becomes an angle other than 180 degrees. In this case, it is preferable that there is a shift of at least one pitch (pitch of the bearing rollers) between the input direction side and the output direction side.

In the present embodiment, the valve shaft 1
Although a configuration is adopted in which needle bearings such as an upper needle bearing 40 and a lower needle bearing 42 are interposed between the valve body 4 and the valve body 28, the present invention is not limited to this, and it is sufficient if the bearing is divided at at least one location in the circumferential direction. . [Second Embodiment] Next, a second embodiment of the present invention will be described with reference to FIGS. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 5, the structure of the control valve 10 as the "output shaft" according to the third aspect is as follows.
This is the same as the first embodiment described above. Complementing the configuration omitted in FIG. 3 of the first embodiment described above, as shown in this figure, the outer periphery of the upper end of the valve body 28 has a ball bearing as a “bearing” according to claim 3. 60 are arranged. Ball bearing 6
The 0 inner race 62 is lightly press-fitted into the upper end of the valve body 28, and the outer race 64 is lightly press-fitted into a gear box housing 66 that houses the control valve 10.

Further, a female screw is formed on the outer peripheral surface of the upper end of the valve body 28, and a bearing fixing nut 68 is screwed into the female screw to prevent the ball bearing 60 from coming off. As shown in FIG. 4A, the bearing fixing nut 68 includes a nut main body 70 formed in a ring shape. The reason why the nut body 70 is formed in a ring shape is that there are restrictions on the inner and outer diameters for reasons of component layout. Further, on the outer peripheral portion of the nut main body 70, rectangular notches 72 in a plan view are formed at a total of three places at intervals of 120 degrees. The notch 72 corresponds to the “engaging recess” described in claim 3.

According to the above configuration, the ball bearing 60
After light press-fitting, the bearing fixing nut 68 is screwed into the valve shaft 14 using a specially shaped tool (not shown). This tool is formed with three engagement projections that can be engaged with the respective notches 72 of the nut body 70. When the bearing fixing nut 68 is tightened, the engagement projections are fitted into the notches 72, and in this state, Use to rotate the tool. In addition,
The engagement protrusion formed on the tool may be one.

In this embodiment, three notches 72 are provided on the outer periphery of the nut body 70 of the bearing fixing nut 68.
Are formed at equal intervals (120-degree intervals), so that the weakest stiffness portions 74 are formed at three places where the notches 72 are formed. Therefore, the deformation mode with the notch 72 as a fulcrum when the bearing fixing nut 68 is tightened using a tool is shown in FIG.
As shown in (B), it becomes substantially triangular. Therefore, as described in the section of the prior art, for example, when four engagement recesses are provided at 90-degree intervals, the weakest portion is formed in the cross direction, so that the deformation mode is substantially elliptical. However, according to the present embodiment, since the deformation mode is substantially triangular, the deformation amount can be suppressed.

Therefore, the roundness of the valve body 28, which is a hollow shaft-shaped member, is not deteriorated, and the frictional force between the valve body 28 and the valve shaft 14 can be reduced. For this reason, in this embodiment, similarly to the first embodiment described above, it is possible to reduce torque fluctuation due to the frictional force. As a result, according to the present embodiment, the valve characteristics of the control valve 10 can be improved.

Further, as described above, since the frictional force between the valve shaft 14 and the valve body 28 can be reduced, the feeling of friction felt by the driver at the time of steering can be reduced. Rings can also be improved.

In the present embodiment, the notch 72 is formed as an “engaging recess” in the outer periphery of the nut body 70 of the bearing fixing nut 68, but the present invention is not limited to this.
It may be replaced with a concave part having a depth of half the thickness of zero.

In the present embodiment, the bearing fixing nut 68 is provided on the outer periphery of the nut body 70 at intervals of 120 degrees.
Although notches 72 are formed, the present invention is not limited to this. If the configuration is such that engagement recesses of a multiple of three (for example, six) are formed at equal intervals, a substantially triangular deformation mode is obtained. It is possible.

Further, in the present embodiment, the shape of the nut main body 70 is a ring shape because of the dimensional restrictions. However, if the dimensional restrictions are relaxed, the shape of the nut main body 70 may be a shape other than the ring shape (for example, , Hexagonal shape, etc.).

In the present embodiment, the ball bearing 60 for rotatably supporting the control valve 10 for the power steering device on the gear box housing 66.
The present invention is applied to the bearing fixing nut 68 provided for fixing the bearing, but the present invention is not limited to this, and the fixing of the bearing for rotatably supporting the output shaft of the steering device without the power steering device on the gear box housing 66 is performed. The present invention may be applied to a bearing fixing nut provided in the above.

[0056]

As described above, the method for assembling a control valve bearing for a power steering apparatus according to the present invention according to claim 1 is arranged on the input direction side when viewed in the axial direction of the valve shaft. These bearings are assembled to the valve shaft such that the angle between the cage split portion of the bearing and the cage split portion of the bearing arranged on the output direction side is an angle other than 180 degrees. The frictional force between the valve body and the valve body can be reduced, and as a result, there is an excellent effect that the valve characteristics can be improved.

According to a second aspect of the present invention, there is provided a method for assembling a bearing of a control valve for a power steering device according to the first aspect of the present invention, wherein the control valve is disposed on an input direction side when viewed in an axial direction of a valve shaft. These bearings were assembled to the valve shaft so that the angle between the cage divided part of the bearing and the cage divided part of the bearing arranged on the output side was 0 degree. It has an excellent effect that it can be easily handled and that automation of assembly can be promoted.

In the bearing fixing nut for a steering device according to the third aspect of the present invention, a multiple of three engaging recesses are formed at equal intervals on the outer peripheral portion of the nut body. When a nut is used to fix the bearing of a control valve for a power steering device, the frictional force between the valve shaft and the valve body can be reduced, and as a result, the valve characteristics can be improved. Has the effect.

[Brief description of the drawings]

1 (A) is a horizontal sectional view taken along line 1 (A) -1 (A) in FIG. 3, and FIG. 1 (B) is a horizontal sectional view taken along line 1 (B) -1 (B) in FIG. FIG.

2A is a front view of the upper needle bearing shown in FIG. 3, and FIG. 2B is a partially cutaway plan view of the needle bearing.

FIG. 3 is a longitudinal sectional view of a control valve for a rack and pinion type power steering device according to the first embodiment.

4A is a horizontal sectional view taken along line 4-4 in FIG. 5, and FIG. 4B is a horizontal sectional view showing a deformation mode when a bearing fixing nut is tightened.

FIG. 5 is a longitudinal sectional view of a control valve for a rack and pinion type power steering device according to a second embodiment.

FIG. 6 is an explanatory diagram for explaining a problem of the related art (a problem that may occur when cage divisions of upper and lower needle bearings are shifted by 180 degrees).

FIG. 7 is an explanatory diagram for explaining a problem of the related art (a problem that may occur when four notches are formed at 90 ° intervals in an outer peripheral portion of a bearing fixing nut).

[Explanation of symbols]

 Reference Signs List 10 control valve (output shaft) 14 valve shaft 16 torsion bar 18 port 20 port 22 port 24 port 28 valve body 40 upper needle bearing (bearing) 42 lower needle bearing (bearing) 44 roller (rolling element) 46 cage 48 cage dividing portion Reference Signs List 50 Roller (rolling element) 52 Cage divided part 54 Cage 60 Ball bearing (bearing) 66 Gear box housing 68 Bearing fixing nut 70 Nut main body 72 Notch (engagement concave part)

Claims (3)

[Claims] 1. A valve body having a plurality of hydraulic control ports formed on a peripheral wall and having a hollow shaft portion, and a torsion bar disposed on the shaft portion and connected to a hollow shaft core portion of the valve body. A valve shaft arranged in an inserted state, each including a plurality of rolling elements and a cage that holds these rolling elements and is divided at at least one location in the circumferential direction, and is configured at a plurality of locations in the axial direction of the valve shaft. A plurality of bearings arranged to support the valve shaft so as to be rotatable relative to the valve body; and a control valve for a power steering device, comprising: This is a method of assembling a bearing that is located on the input side when viewed in the axial direction of the valve shaft. Angle between the cage splitting portion and the cage splitting portion of the arranged bearing on the output side of bearings 180
A method for assembling a bearing for a control valve for a power steering device, wherein the bearing is attached to a valve shaft so as to have an angle other than degrees. 2. When viewed in the axial direction of the valve shaft,
These bearings are assembled to the valve shaft such that the angle formed between the cage split part of the bearing arranged on the input side and the cage split part of the bearing arranged on the output side becomes 0 degrees. The method for assembling a bearing of a control valve for a power steering device according to claim 1. 3. An output shaft which rotates around an axis by a steering input and transmits the steering input to a steering output side, and is interposed between a gearbox housing for accommodating the output shaft, and connects the output shaft to the gearbox housing. A bearing fixing nut for a steering device for fixing a bearing rotatably supported to an output shaft, wherein a multiple of three engaging recesses are formed at equal intervals on an outer peripheral portion of a nut body. Bearing fixing nut for steering device.