JP7232850B2 - steering device - Google Patents

Description

The present invention relates to steering devices.

In the steering device disclosed in Patent Document 1, a tubular boot is attached to the gear case. The boot is fastened and fixed to the cylindrical portion of the gear case by the boot band.

JP 2020-171105 A

In such a steering device, the boot is tightened to the cylindrical portion of the gear case by the boot band, thereby preventing foreign matter from entering the gear case through the gap between the gear case and the boot. However, if the outer peripheral surface of the cylindrical portion of the gear case to which the boot is tightened is flat in an axial cross-section, the contact surface between the gear case and the boot becomes straight in the cross-section. You may not get sex.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to improve the sealing performance between the housing and the boot of a steering device.

The present invention is a steering device comprising a rack shaft for steering wheels, a housing having an opening for accommodating the rack shaft and from which the rack shaft protrudes, a boot covering the opening of the housing, and a housing including the boot. and an annular band portion that presses and fixes toward the outer peripheral surface of the housing. a projecting portion of, the projecting portion having a wall portion extending perpendicularly to the axial direction from the pressed portion and a tapered portion extending from the pressed portion toward the wall portion, the tapered portion being , is provided closer to the opening of the housing than the wall .

The present invention is characterized in that the projecting portion has a smaller dimension than the pressed portion in the axial direction of the opening.

In these inventions, since the boot is pressed by the band portion toward the projecting portion of the housing, the load from the band portion is more likely to act on the boot at the projecting portion than at other portions of the pressed portion. Therefore, the contact surface pressure between the housing and the boot increases at the projecting portion. As a result, the projecting portion of the housing and the boot can be brought into close contact with each other. Moreover, since the tapered portion is provided closer to the opening of the housing than the wall portion, the mounting of the boot to the housing is not hindered by the projecting portion. In addition, since the attached boot is locked to the wall, the boot is prevented from falling out of the housing.

The present invention has, as the protrusion, a first protrusion and a second protrusion provided further away from the center of the pressed portion than the first protrusion in the axial direction, and the second protrusion has a diameter The amount of protrusion in the direction is larger than that of the first protrusion.

In this invention, the second projecting portion formed on the end portion side of the pressed portion has a larger amount of projection in the radial direction than the first projecting portion on the center side of the pressed portion. Therefore, the contact surface pressure between the housing and the boot increases on the end side of the pressed portion. Here, the thickness of the boot tends to be thin on the end portion side of the pressed portion. As a result, the contact surface pressure between the housing and the boot increases at locations where the boot tends to be thin, so that the sealing performance between the housing and the boot can be efficiently improved.

According to the present invention, it is possible to improve the sealing performance between the housing of the steering device and the boot.

1 is a configuration diagram of an electric power steering device according to an embodiment; FIG. 4 is an enlarged cross-sectional view of the gear case and boot; FIG. 4 is an enlarged cross-sectional view of a fixing portion between the gear case and the boot; FIG. FIG. 4 is an enlarged cross-sectional view corresponding to FIG. 3 of a fixing portion between a gear case and a boot according to a modification;

An electric power steering device 100 as a steering device according to an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, an electric power steering device 100 includes a steering shaft 20 that rotates by steering torque input from a steering wheel 10, and a steering shaft that steers wheels 1 as the steering shaft 20 rotates. and a rack shaft 30 .

The steering shaft 20 includes an input shaft 21 that rotates as the driver operates the steering wheel 10, an output shaft 22 that displaces the rack shaft 30, and a torsion bar that connects the input shaft 21 and the output shaft 22. 23 and .

The rack shaft 30 is a shaft-shaped member that extends in the lateral direction of the vehicle, is connected to one wheel 1 via a first tie rod 41a and a first knuckle arm 42a, and is connected to a second tie rod 41b and a second knuckle arm. It is connected to the other wheel 1 via 42b.

The first and second tie rods 41a and 41b are swingably connected to the rack shaft 30 via first and second ball joints 43a and 43b as connecting portions provided at both ends of the rack shaft 30. be. Note that the connecting portion that connects the rack shaft 30 and the first and second tie rods 41a and 41b is not limited to the first and second ball joints 43a and 43b, and other types of universal joints may be used. good.

The output shaft 22 and the rack shaft 30 are connected to each other via a rack and pinion mechanism consisting of a pinion gear 22a provided at the end of the output shaft 22 and a rack gear 30a provided on the rack shaft 30 . The pinion gear 22a and the rack gear 30a are meshed with each other, and the torque of the output shaft 22 is converted into a load in the axial direction of the rack shaft 30 and transmitted to the rack shaft 30 via the pinion gear 22a and the rack gear 30a. As a result, the rack shaft 30 is displaced in the axial direction by the transmitted torque, and steers the wheels 1 via the first and second tie rods 41a and 41b.

Further, the electric power steering device 100 includes an electric motor 50 that is driven to assist steering force in response to steering operation, and a reduction section 52 that reduces the rotation of the electric motor 50 and transmits it to the steering shaft 20. Prepare.

The speed reducer 52 is a worm gear mechanism including a worm shaft 53 driven by the electric motor 50 and a worm wheel 54 provided on the output shaft 22 . The worm shaft 53 and the worm wheel 54 mesh with each other, and the torque of the electric motor 50 is transmitted to the output shaft 22 via the worm shaft 53 and the worm wheel 54 . The torque transmitted from the electric motor 50 to the output shaft 22 is further transmitted to the rack shaft 30 via the pinion gear 22a and the rack gear 30a.

The electric power steering device 100 further includes a torque sensor 62 that detects torque acting on the torsion bar 23 and a controller 60 that controls driving of the electric motor 50 according to the detected value of the torque sensor 62 .

The controller 60 includes a CPU (Central Processing Unit) that performs arithmetic processing, a ROM (Read-Only Memory) that stores control programs and the like executed by the CPU, and a RAM (random access memory) that stores the calculation results of the CPU and the like. and a microcomputer including The controller 60 may be composed of a single microcomputer, or may be composed of a plurality of microcomputers.

The torque sensor 62 detects the steering torque applied to the input shaft 21 in accordance with the driver's steering operation, and outputs a signal corresponding to the detected steering torque to the controller 60 . The controller 60 calculates the torque output by the electric motor 50 based on the signal from the torque sensor 62, and controls driving of the electric motor 50 so that the torque is generated.

Thus, in the electric power steering apparatus 100 having the above configuration, the steering torque applied to the input shaft 21 is detected by the torque sensor 62, and the drive of the electric motor 50 is controlled by the controller 60 based on the detection result. It is possible to assist the driver's steering operation.

As shown in FIG. 2, the electric power steering apparatus 100 includes a gear case 70 as a housing having openings 71a and 71b that accommodate the rack shaft 30 and from which the rack shaft 30 protrudes. The gear case 70 is made of metal such as aluminum, for example.

The electric power steering apparatus 100 includes boots 80a and 80b covering openings 71a and 71b of the gear case 70, and a boot band 90a as an annular band portion that presses and fixes the boots 80a and 80b toward the outer peripheral surface 72 of the gear case 70. , 90b. The boots 80a, 80b cover the rack shaft 30 protruding from the openings 71a, 71b of the gear case 70 and the first and second tie rods 41a, 41b (see FIG. 1), respectively, and cover the rack shaft 30 and the first and second tie rods 41a, 41b. It protects the two tie rods 41a and 41b from foreign matter. The boot bands 90a and 90b are formed with a predetermined length in the axial direction, and fasten and fix the boots 80a and 80b to the outer peripheral surface 72 of the gear case 70, respectively. As a result, the openings 71a and 71b are covered with the boots 80a and 80b, preventing foreign matter from entering the gear case 70 through the openings 71a and 71b.

Since the vicinity of the openings 71a and 71b, the boots 80a and 80b, and the boot bands 90a and 90b have the same configuration, the configuration of the vicinity of the opening 71a, the boot 80a, and the boot band 90a on the left side in FIG. 2 will be described below. , the vicinity of the opening 71b, the boot 80b, and the boot band 90b will not be described. Further, hereinafter, the opening 71a is also simply referred to as the "opening 71", the boot 80a is simply referred to as the "boot 80", and the boot band 90a is simply referred to as the "boot band 90".

The gear case 70 has an accommodation hole 73 that accommodates the rack shaft 30 and a recess 74 that is formed in the outer peripheral surface 72 and to which the boot band 90 is attached together with the boot 80 . The accommodation hole 73 penetrates the gear case 70 and has an opening 71 at its end. The rack shaft 30 is inserted through the accommodation hole 73 and protrudes from the opening 71 . The recess 74 is annularly formed in the vicinity of the opening 71 and has an axial length longer than the axial length of the boot band 90 . That is, on the outer peripheral surface 72 of the gear case 70 , part of the recess 74 is pressed radially inward by the boot band 90 . In other words, the gear case 70 has a pressed portion 75 of the outer peripheral surface 72 that is pressed by the boot band 90 . Specifically, the pressed portion 75 refers to a region of the recessed portion 74 located radially inward of the boot band 90 .

As shown in FIG. 3 , an annular projecting portion 76 projecting from the pressed portion 75 in the radial direction of the opening portion 71 is formed in the recessed portion 74 . In other words, the protrusion 76 is formed between both ends of the pressed portion 75 in the axial direction of the opening 71 . In this embodiment, two protrusions 76 having the same shape are formed near the center of the recess 74 with an interval in the axial direction.

The projecting portion 76 includes a wall portion 76 a extending perpendicularly to the axial direction of the opening 71 from the bottom surface of the recess 74 of the gear case 70 , and a wall portion 76 a extending from the bottom surface of the recess 74 toward the wall portion 76 a away from the opening 71 . It has a tapered portion 76b and a connection portion 76c that connects the wall portion 76a and the tapered portion 76b. Specifically, the wall portion 76 a protrudes from the pressed portion 75 of the outer peripheral surface 72 along the radial direction of the opening 71 . The tapered portion 76b is formed so that the amount of radial projection of the opening 71 increases as it approaches the wall portion 76a. The connecting portion 76 c is provided along the axial direction of the opening 71 . That is, the projecting portion 76 is formed so that the cross section along the axial direction of the opening portion 71 is trapezoidal. The bottom surface of the recessed portion 74 from which the wall portion 76a and the tapered portion 76b extend is part of the outer peripheral surface 72 .

The tapered portion 76b is provided closer to the opening 71 of the gear case 70 than the wall portion 76a. Specifically, the opening 71a and the opening 71b will be used to explain. In the projecting portion 76 formed in the recess 74 near the opening 71a, the tapered portion 76b is provided closer to the opening 71a than the wall portion 76a. Also, although not shown, in the projecting portion formed in the recess near the opening 71b, the tapered portion is provided closer to the opening 71b than the wall portion.

The boot 80 is a bellows-shaped tubular member made of, for example, rubber or resin. The boot 80 can extend and contract in the axial direction of the rack shaft 30 so as to follow the reciprocating motion of the rack shaft 30 . The boot 80 has a body portion 81 and an annular attachment portion 82 provided at the end of the body portion 81 and attached to the gear case 70 . The inner peripheral surface of the mounting portion 82 contacts the bottom surface of the recessed portion 74 of the gear case 70 . A flange portion 83 projecting radially outward from the mounting portion 82 is formed at the end portion of the mounting portion 82 opposite to the main body portion 81 . A housing space 84 in which the boot band 90 can be accommodated is formed on the outer peripheral surface of the mounting portion 82 by the boundary between the body portion 81 and the mounting portion 82 and the flange portion 83 . The accommodation space 84 is formed in a concave shape and has an axial length longer than the axial length of the boot band 90 so that the boot band 90 can be accommodated therein. After the boot 80 is attached to the gear case 70 from the opening 71 side so that the inner peripheral surface of the attachment portion 82 is accommodated in the recess 74 , the boot band 90 is attached to the accommodation space 84 . Then, it is tightened and fixed to the concave portion 74 of the gear case 70 . The other end of boot 80 is fixed to first tie rod 41a.

Thus, when the boot 80 is tightened and fixed to the gear case 70 by the boot band 90 , the boot 80 is pressed toward the projecting portion 76 of the gear case 70 . Therefore, the load from the boot band 90 is more likely to act on the boot 80 at the projecting portion 76 than at other portions of the pressed portion 75 . Therefore, the contact surface pressure between the gear case 70 and the boot 80 is increased at the projecting portion 76, and the projecting portion 76 of the gear case 70 and the boot 80 can be brought into close contact with each other. In this embodiment, the contact surface pressure between the gear case 70 and the boot 80 increases at the corner between the wall portion 76a and the connecting portion 76c, and the gear case 70 and the boot 80 are brought into close contact with each other. Therefore, the sealing performance between the gear case 70 and the boot 80 can be improved.

Further, when the gear case does not have a projecting portion, the gear case and the boot are in contact with each other on the cylindrical surface, and the contact surface between the gear case and the boot is straight in the axial cross section of the opening. With this configuration, the entrance path for foreign matter that attempts to enter the gear case through the gap between the gear case and the boot is short. On the other hand, since the gear case 70 of the electric power steering apparatus 100 according to the present embodiment has the protruding portion 76, the entry path of the foreign matter that attempts to enter the gear case 70 through the space between the gear case 70 and the boot 80 becomes longer. Therefore, the sealing performance between the gear case 70 and the boot 80 can be improved.

Therefore, even if the electric power steering device 100 receives muddy water or salt water during a quality test or the like, the gear case 70 and the boot 80 are highly sealed. It is possible to suppress the progress of corrosion of the gear case 70 made of aluminum due to intrusion of muddy water or salt water.

Further, the projecting portion 76 is provided with a tapered portion 76b extending toward the wall portion 76a closer to the opening portion 71 of the gear case 70 than the wall portion 76a. Specifically, in the projection 76 formed in the recess 74 near the opening 71a, the tapered portion 76b is provided closer to the opening 71a than the wall 76a, and the projection formed in the recess 74 near the opening 71b In the portion 76, the tapered portion 76b is provided closer to the opening portion 71b than the wall portion 76a. Therefore, when the boot 80 is attached to the gear case 70 from the opening 71 side, the tapered portion 76b allows the boot 80 to easily climb over the projecting portion 76, so that the attachment of the boot 80 to the gear case 70 is hindered by the projecting portion 76. not. Further, since the attached boot 80 is locked to the wall portion 76a, the boot 80 is prevented from falling off from the gear case 70. As shown in FIG.

According to the present embodiment described above, the following effects can be obtained.

In the electric power steering device 100, the boot 80 is pressed toward the protruding portion 76 of the gear case 70, so that the boot 80 receives more load from the boot band 90 at the protruding portion 76 than at other portions of the pressed portion 75. easier to work. Therefore, the contact surface pressure between the gear case 70 and the boot 80 is increased at the projecting portion 76, and the projecting portion 76 of the gear case 70 and the boot 80 can be brought into close contact with each other. In this embodiment, the contact surface pressure between the gear case 70 and the boot 80 increases at the corner between the wall portion 76a and the connecting portion 76c, and the gear case 70 and the boot 80 are brought into close contact with each other. Therefore, the sealing performance between the gear case 70 and the boot 80 can be improved.

Since the gear case 70 has the protruding portion 76 , the entry path for foreign matter that attempts to enter the gear case 70 through the space between the gear case 70 and the boot 80 is lengthened. Therefore, the sealing performance between the gear case 70 and the boot 80 can be improved.

Since the tapered portion 76b extending toward the wall portion 76a of the protruding portion 76 is provided closer to the opening side 55 of the gear case 70 than the wall portion 76a, when the boot 80 is attached to the gear case 70 from the opening portion 71 side, the boot 80 can easily get over the projecting portion 76 due to the tapered portion 76 b , the mounting of the boot 80 to the gear case 70 is not hindered by the projecting portion 76 . Further, since the attached boot 56 is locked to the wall portion 76a, the boot 80 is prevented from falling off from the gear case 70. As shown in FIG.

Next, a modified example of this embodiment will be described.

<Modification 1>
In the above-described embodiment, two projections 76 having the same shape are provided near the center of the pressed portion 75 with an interval therebetween in the axial direction. However, for example, as shown in FIG. 4, three protrusions 77, 78, and 79 having different shapes may be formed as protrusions. Specifically, the electric power steering device 100 includes a projecting portion 77 as a first projecting portion, and a projecting portion 77 that is spaced further from the center of the pressed portion 75 than the projecting portion 77 in the axial direction of the opening 71 . The configuration may include the projecting portion 78 and the projecting portion 79 as the second projecting portion. The projecting portion 77 is provided near the center of the pressed portion 75, for example. The projecting portion 78 is provided closer to the opening 71 than the projecting portion 77 is, and the projecting portion 79 is formed on the side opposite to the projecting portion 78 with respect to the projecting portion 77 . That is, the projecting portions 78 and 79 are provided closer to the end portion of the pressed portion 75 than the projecting portion 77 in the axial direction of the opening 71 .

The projecting portion 77 has a wall portion 77a, a tapered portion 77b, and a connecting portion 77c, like the projecting portion 76 in the above embodiment. The projecting portion 78 includes a wall portion 78a extending perpendicularly to the axial direction of the opening 71 from the pressed portion 75, and a tapered portion 78b extending from the pressed portion 75 toward the wall portion 78a away from the opening portion 71. , and the wall portion 78a and the tapered portion 78b are continuous. Like the protrusion 78, the protrusion 79 has a wall portion 79a and a tapered portion 79b. The protruding portions 78 and 79 are formed to project larger than the protruding portion 77 from the recess 74 in the radial direction of the opening 71 . Specifically, the walls 78a and 79a are formed to be longer than the wall 77a in the radial direction of the opening 71 . Therefore, the protruding portions 78 and 79 provided closer to the end portion of the pressed portion 75 than the protruding portion 77 protrude from the opening 71 in the radial direction. becomes easier to operate. Therefore, the contact surface pressure between the gear case 70 and the boot 80 increases on the end side of the pressed portion 75 .

Here, the inner peripheral surface of the mounting portion 82 of the boot 80 contacts the bottom surface of the recess 74 of the gear case 70 . Therefore, the boot 80 is thick on the center side of the recess 74 in the axial direction, and the boot 80 is thin on both end sides of the recess 74 in the axial direction. In other words, the boot 80 tends to be thin at both end portions of the pressed portion 75 . Since the contact surface pressure between the gear case 70 and the boot 80 is lower where the boot 80 is thinner than where the boot 80 is thicker, the sealing performance between the gear case 70 and the boot 80 may deteriorate. However, in this modification, since the contact surface pressure between the gear case 70 and the boot 80 increases on the end side of the pressed portion 75 where the boot 80 tends to be thin, the sealing performance between the gear case 70 and the boot 80 is effectively improved. can be substantially improved.

Only one of the projecting portions 78 and 79 may be formed. Further, when four or more protrusions are formed, an opening between one of the protrusions and a protrusion provided further away from the center of the pressed part 75 than the protrusion in the axial direction of the opening 71 Comparing the amount of protrusion in the radial direction of the portion 71, it is desirable that the amount of protrusion of the latter is larger. Even with these configurations, similarly to the above, the sealing performance between the gear case 70 and the boot 80 can be efficiently improved.

<Modification 2>
In the above embodiment, two protrusions 76 having the same shape are provided as the protrusions. However, the number of protrusions may be one or a plurality of three or more. When the number of protrusions is plural, they may be provided at intervals in the axial direction. By adjusting the number of protrusions in this manner, the number of places where the gear case 70 and the boot 80 are in close contact with each other and the entry path of foreign matter trying to enter the gear case 70 through the space between the gear case 70 and the boot 80 can be reduced. The length can be adjusted step by step. Therefore, the sealing performance between the gear case 70 and the boot 80 can be adjusted in stages.

When the number of projecting portions is one, the projecting portion preferably has a smaller dimension than the pressed portion 75 in the axial direction of the opening 71 . For example, in the projecting portion 76, the dimension of the projecting portion refers to the distance from the boundary between the pressed portion 75 and the tapered portion 76b to the boundary between the pressed portion 75 and the wall portion 76a. As a result, the contact surface pressure between the gear case 70 and the boot 80 reliably increases at the projecting portion, and the sealing performance between the gear case 70 and the boot 80 can be reliably improved. However, if the projecting portion has a configuration in which the length in the axial direction of the opening 71 decreases as the distance from the pressed portion 75 increases in the radial direction, as in the projecting portion 76, the length of the projecting portion in the axial direction of the opening 71 increases. It may have the same dimensions as the portion 75 .

<Modification 3>
In the above-described embodiment, the projecting portion 76 having a trapezoidal cross section along the axial direction of the opening 71 is provided as the projecting portion. However, the shape of the projecting portion is not limited to the above. For example, the cross section of the protruding portion along the axial direction of the opening 71 may be triangular, quadrangular, or semicircular. Further, when there are a plurality of projecting portions, even if projecting portions having different cross-sectional shapes along the axial direction of the opening 71 are mixed, projecting portions having different projecting amounts in the radial direction of the opening 71 are mixed. may

The configuration, action, and effect of the embodiment of the present invention configured as described above will be collectively described.

An electric power steering device 100 as a steering device includes a rack shaft 30 for steering the wheels 1, a gear case 70 as a housing having an opening 71 for accommodating the rack shaft 30 and from which the rack shaft 30 protrudes, and a gear case 70. and a boot band 90 as an annular band portion that presses and fixes the boot 80 toward the outer peripheral surface 72 of the gear case 70 . It has a pressed portion 75 that is pressed by the band 90 and annular protrusions 76 , 77 , 78 , and 79 that protrude from the pressed portion 75 in the radial direction of the opening 71 .

In addition, the projecting portions 76 , 77 , 78 , 79 have dimensions smaller than the pressed portion 75 in the axial direction of the opening 71 .

In these configurations, the boot 80 is pressed toward the projecting portions 76 , 77 , 78 , 79 of the gear case 70 , so that the boot 80 has more contact with the projecting portions 76 , 77 , 78 than other portions of the pressed portion 75 . , 79, the load from the boot band 90 is likely to act. Therefore, the contact surface pressure between the gear case 70 and the boot 80 is increased at the projecting portions 76, 77, 78, and 79. FIG. As a result, the projecting portions 76, 77, 78, 79 of the gear case 70 and the boot 80 can be brought into close contact with each other.

The projecting portions 76 , 77 , 78 , 79 include wall portions 76 a , 77 a , 78 a , 79 a extending perpendicularly to the axial direction from the pressed portion 75 , wall portions 76 a , 77 a , 78 a , tapered portions 76b, 77b, 78b, 79b extending toward 79a, and the tapered portions 76b, 77b, 78b, 79b are closer to the opening 71 side of the gear case 70 than the wall portions 76a, 77a, 78a, 79a. be provided.

In this configuration, the tapered portions 76b, 77b, 78b, 79b extending toward the walls 76a, 77a, 78a, 79a are provided closer to the opening 71 of the gear case 70 than the walls 76a, 77a, 78a, 79a. Attachment of the boot 80 to the gear case 70 is not hindered by the projections 76, 77, 78, 79. Further, since the attached boot 80 is locked by the walls 76a, 77a, 78a and 79a, the boot 80 is prevented from coming off the gear case 70. FIG.

Further, the electric power steering apparatus 100 includes, as protrusions, a protrusion 77 as a first protrusion, and a protrusion as a second protrusion provided further away from the center of the pressed portion 75 than the protrusion 77 in the axial direction. The protruding portions 78 and 79 protrude larger than the protruding portion 77 in the radial direction.

In this configuration, the protruding portions 78 and 79 formed on the end side of the pressed portion 75 protrude more in the radial direction than the protruding portion 77 on the central side of the pressed portion 75 . Since it is large, the contact surface pressure between the gear case 70 and the boot 80 is high on the end side of the pressed portion 75 . Here, the thickness of the boot 80 tends to be thin on the end portion side of the pressed portion 75 . Therefore, since the contact surface pressure between the gear case 70 and the boot 80 is increased at a location where the boot 80 tends to be thin, the sealing performance between the gear case 70 and the boot 80 can be efficiently improved.

Although the embodiments of the present invention have been described above, the above embodiments merely show a part of application examples of the present invention, and the technical scope of the present invention is not limited to the specific configurations of the above embodiments. do not have.

Reference Signs List 1 Wheel 30 Rack shaft 70 Gear case (housing) 71 Opening 72 Peripheral surface 75 Pressed portion 80 Boot 90... boot band (band portion), 76... protrusion, 77... protrusion (first protrusion), 78... protrusion (second protrusion), 79... protrusion (Second protrusion), 100...Electric power steering device (steering device)

Claims (3)

A steering device,
a rack shaft for steering the wheels;
a housing containing the rack shaft and having an opening from which the rack shaft protrudes;
a boot covering the opening of the housing;
an annular band portion that presses and fixes the boot toward the outer peripheral surface of the housing;
The housing is
a pressed portion pressed by the band portion of the outer peripheral surface;
an annular projecting portion projecting from the pressed portion in a radial direction of the opening ;
The protrusion is
a wall portion extending perpendicularly to the axial direction from the pressed portion;
a taper portion extending from the pressed portion toward the wall portion,
The steering device , wherein the taper portion is provided closer to the opening of the housing than the wall portion . The steering device according to claim 1,
The steering device, wherein the projecting portion has a dimension smaller than that of the pressed portion in the axial direction of the opening. The steering device according to claim 1 or 2 ,
As the projecting portion, a first projecting portion and a second projecting portion provided further away from the center of the pressed portion than the first projecting portion in the axial direction,
The steering device, wherein the second projecting portion has a projecting amount in the radial direction larger than that of the first projecting portion.

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