JP2023183045A - Steering gear torque detection device - Google Patents

Abstract

To provide a steering gear torque detection device that enables suppressing interference of a stator with a magnetic collector yoke.SOLUTION: A steering gear torque detection device comprises: a bearing 70 that is assembled to a first pinion gear 88a, and arranged inside of a housing 20 to support the first pinion gear 88a in a freely rotatable manner; a stator 50 that is fixed to the first pinion gear 88a; a magnetic collector yoke 43 that is arranged so as to disable a relative movement to the housing 20, and overlaps with a flange part 51 of the stator 50 with a gap in a shaft direction; a cover screw 60 that engages with a female thread 24 formed in a cover screw storage dent part 23 formed in the housing 20 to fix the bear 70; and a restriction member 33 that restricts a movement in a direction in which the cover screw 60 separates from bearing 70. A minimum value of the gap between the flange part 51 of the stator 50 and the magnetic collector yoke 43 in a state where the cover screw 60 and bearing 70 abut with each other is larger than that between the cover screw 60 and the restriction member 33.SELECTED DRAWING: Figure 6

Description

The present disclosure relates to a torque detection device for a steering device.

There are various methods of torque detection devices that detect torque applied to a rotating body of a steering device, and one example is one that detects torque by detecting changes in magnetism. For example, the torque detection device described in Patent Document 1 includes a permanent magnet whose N poles and S poles are arranged alternately and is fixed to an input shaft, a first stator, and a second stator, and which is attached to a handle-side pinion shaft. It has a stator unit that is fixed, and a sensor unit that includes a first collector, a second collector, and a magnetic sensor and collects magnetic flux guided by the first stator and the second stator. Thereby, the torque detection device detects the magnetic flux density between the first collector and the second collector, and converts the detected magnetic flux density into a voltage signal, thereby detecting the steering torque applied to the steering wheel. is now possible.

Japanese Patent Application Publication No. 2016-179760

The torque detection device of the steering system detects the torque acting on the rotating body like these, but the rotating body whose torque is detected by the torque detection device needs to be rotatably supported, so the rotating body has a bearing. is supported by the housing via the housing. For example, a bearing that supports a rotating body is assembled to the rotating body so that the inner ring of the bearing cannot move relative to the rotating body, and the outer ring of the bearing is moved in the axial direction by a nut that is screwed into the housing. is not possible and is assembled into the housing. Thereby, the rotating body is supported by the housing via the bearing so that it can rotate relative to the housing.

However, if the nut supporting the bearing becomes loose, the bearing can move in the axial direction, and accordingly, the rotating shaft can also move in the axial direction with respect to the housing. Here, the stator that guides the magnetic flux of the permanent magnet is fixed to the rotating shaft, and the collector that collects the magnetic flux guided by the stator, that is, the magnetic collection yoke is fixed to the housing. Therefore, if the rotating shaft moves axially relative to the housing due to the nut loosening, the stator attached to the rotating shaft will move axially together with the rotating shaft, and the magnetic flux collecting yoke fixed to the housing will move. The distance to the stator will become closer.

In this way, when the rotating shaft moves in the axial direction due to loosening of the nut that assembles the bearing to the housing, if the rotating shaft moves significantly, the stator will also move significantly along with the rotating body, so The magnetic yoke and stator will interfere. If the magnetic collecting yoke and stator interfere, the magnetic collecting yoke and stator will be deformed and the magnetic collecting yoke will no longer be able to collect the magnetic field properly, resulting in an abnormal output from the torque detection device, making it difficult to accurately detect torque. become unable to do so. Therefore, there is room for improvement in how to assemble parts around the torque detection device.

The present disclosure has been made in view of the above, and an object of the present disclosure is to provide a torque detection device for a steering device that can suppress interference between a stator and a magnetic collecting yoke.

A torque detection device for a steering device according to the present disclosure includes a housing, a shaft disposed inside the housing, and assembled so as to be immovable relative to the shaft in an axial direction of the shaft, and mounted inside the housing. a bearing arranged to rotatably support the shaft; a stator having a flange portion projecting outward in a radial direction of the shaft; and a stator fixed to the shaft; and a stator arranged so as not to move relative to the housing. a magnetic flux collecting yoke that overlaps the flange portion of the stator with a gap in the axial direction; and a cover screw housing that is formed in an annular shape, through which the shaft passes inside, and that is formed in the housing. a cover screw that is screwed into a female thread formed on an inner circumferential surface of the recess to sandwich and fix the bearing in the axial direction between the bearing and the housing; and a cover screw that is arranged with respect to the cover screw in the axial direction. a regulating member disposed on the opposite side to the side where the cover screw is moved away from the bearing, and in a state where the cover screw and the bearing are in contact with each other, A minimum value of the gap in the axial direction between the flange portion of the stator and the magnetic flux collecting yoke is larger than the gap in the axial direction between the cover screw and the regulating member.

According to this configuration, the regulating member is arranged on the side opposite to the side where the bearing is arranged with respect to the cover screw, so even if the cover screw becomes loose, the amount of movement of the cover screw is limited by the regulating member. can do. Thereby, the amount of axial movement of the stator fixed to the shaft to which the bearing is assembled can be limited to the size of the axial gap between the cover screw and the regulating member. Furthermore, when the cover screw and the bearing are in contact with each other, the minimum value of the axial clearance between the stator flange and the magnetic flux collecting yoke is larger than the axial clearance between the cover screw and the regulating member. There is. Therefore, even if the stator moves relative to the magnetic flux collecting yoke in the axial direction by the same amount as the gap between the cover screw and the regulating member due to loosening of the cover screw, the flange of the stator and the magnetic collecting yoke It is possible to maintain a state in which there is an axial gap between the two. As a result, interference between the stator and the magnetic flux collecting yoke can be suppressed.

In a desirable embodiment, a second housing is fixed to the housing at a position opposite to the cover screw in the axial direction from the side where the bearing is disposed, and the magnetic flux collecting yoke is disposed therein. The regulating member is formed in the second housing.

According to this configuration, since the regulating member is formed in the second housing, the regulating member can easily be used as a regulating member that limits the amount of movement of the cover screw when the cover screw is loosened, without providing a dedicated member. can be placed in As a result, the amount of movement of the cover screw when the cover screw loosens can be easily limited, and interference between the stator and the magnetic flux collection yoke can be suppressed.

Preferably, the housing has a pilot recess that is recessed to a predetermined depth in the axial direction on the inner circumferential surface of the end where the second housing is disposed, and the second housing has a pilot recess that is recessed to a predetermined depth in the axial direction. A spigot convex portion is formed in the second housing, protruding toward the side where the housing is located, and entering into the spigot recess to position the housing in the radial direction. On the other hand, a plane portion is formed that abuts in the axial direction to perform positioning in the axial direction with respect to the housing, and the regulating member is formed by the spigot convex portion.

According to this configuration, the regulating member formed on the second housing is formed by the spigot convex portion that positions the second housing with respect to the housing. By fixing the two housings, the cover screw can be placed at an appropriate position where the amount of movement can be restricted. As a result, the amount of movement of the cover screw when the cover screw loosens can be easily limited, and interference between the stator and the magnetic flux collection yoke can be suppressed.

Preferably, the magnetic flux collecting yoke is housed in a magnetic flux collecting yoke housing, and the magnetic flux collecting yoke housing is fixed to the second housing.

According to this configuration, the magnetic flux collecting yoke is housed in the magnetic flux collecting yoke housing fixed to the second housing, the second housing is attached to the housing to which the bearing is fixed, and the stator is attached to the shaft to which the bearing is assembled. Fixed. Therefore, by restricting the amount of movement of the cover screw when the cover screw is loosened by the regulating member, the amount of movement of the stator can be restricted via the bearing and the shaft, and the stator relative to the magnetic flux collecting yoke can be restricted. can limit the amount of movement. As a result, the distance between the flange portion of the stator and the magnetic flux collecting yoke can be prevented from becoming too small, and interference between the stator and the magnetic flux collecting yoke can be suppressed.

Preferably, the second housing has a sensor opening that opens in the radial direction, and the magnetic flux collecting yoke housing is inserted into the sensor opening and fixed to the second housing.

According to this configuration, the magnetic flux collecting yoke housing that stores the magnetic collecting yoke is inserted into the sensor opening formed in the second housing and is fixed to the second housing, so that the magnetic collecting yoke is fixed to the second housing. can be easily placed with high positional accuracy. As a result, the axial gap between the stator flange and the magnetic flux collecting yoke can be set to an appropriate size, and the distance between the stator flange and the magnetic flux collecting yoke can be prevented from becoming too small. . As a result, interference between the stator and the magnetic flux collection yoke when the cover screw loosens can be suppressed.

Preferably, a pair of stators are arranged, and the magnetic flux collecting yoke housing is fixed to the second housing with the magnetic collecting yoke inserted between the flange portions of each of the pair of stators. .

According to this configuration, the magnetic flux collecting yoke housing is fixed to the second housing with the magnetic flux collecting yoke inserted between the respective flanges of the pair of stators. It can be easily placed in a position where there is an axial gap between the two. As a result, the axial gap between the stator flange and the magnetic flux collecting yoke can be set to an appropriate size, and the distance between the stator flange and the magnetic flux collecting yoke can be prevented from becoming too small. . As a result, interference between the stator and the magnetic flux collection yoke when the cover screw loosens can be suppressed.

Preferably, the housing is formed with a bearing storage recess for storing the bearing, and the cover screw storage recess has a diameter larger than the diameter of the bearing storage recess at a position different from the bearing storage recess in the axial direction. The cover screw has a male thread formed on its outer peripheral surface, and the bearing is stored in the bearing storage recess, and the outer ring of the bearing is between the cover screw and the bearing storage recess. It is assembled into the housing by being sandwiched.

According to this configuration, since the cover screw storage recess is formed in the housing at a different position in the axial direction from the bearing storage recess, the cover screw has a male thread on the outer circumference that is screwed into the female thread of the cover screw storage recess. Accordingly, the bearing to be stored in the bearing storage recess can be easily fixed by being sandwiched between the cover screw and the bearing storage recess. This makes it possible to restrict movement in the axial direction of the shaft on which the bearing is assembled, and to arrange the stator fixed to the shaft with an axial gap between the flange of the stator and the magnetic flux collecting yoke. , it is possible to maintain a state with a gap. As a result, interference between the stator and the magnetic flux collecting yoke can be suppressed.

As a desirable form, the inner diameter of the cover screw is smaller than the outer diameter of the inner ring of the bearing.

According to this configuration, the inner diameter of the cover screw is smaller than the outer diameter of the inner ring of the bearing, so a large load in the direction of moving the shaft in the axial direction acts on the steering device, causing the inner and outer rings of the bearing to move in the axial direction. Even if damage occurs to the bearing that causes relative movement, the inner ring that has moved relative to the outer ring can be brought into contact with the cover screw. As a result, relative movement of the inner ring 72 of the bearing in the axial direction with respect to the outer ring is restricted, so that relative movement of the shaft to which the inner ring is assembled with respect to the housing can be restricted. As a result, damage that occurs to the steering device when a large load is applied to the steering device can be suppressed.

The torque detection device for a steering device according to the present disclosure has the effect of suppressing interference between the stator and the magnetic collecting yoke.

FIG. 1 is a schematic diagram for explaining a steering device according to an embodiment. FIG. 2 is a perspective view of main parts of the steering device according to the embodiment. FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG. 4 is a sectional view taken along line BB in FIG. FIG. 5 is a schematic diagram illustrating an overview of a magnet, a stator, and a magnetic collecting yoke included in the torque sensor. FIG. 6 is a detailed diagram of the surroundings of the torque sensor shown in FIG. 3. FIG. 7 is a detailed view of a portion where the magnetic flux collecting yoke assembly is attached to the second housing. FIG. 8 is a detailed view showing the state before the magnetic flux collecting yoke assembly is attached to the second housing shown in FIG. 7. FIG. 9 is a perspective cross-sectional view at a position where the magnetic flux collecting yoke in FIG. 7 is arranged. FIG. 10 is a detailed view showing a portion where the cover screw shown in FIG. 6 and the bearing are in contact with each other. FIG. 11 is a detailed view of the gap between the pilot convex portion of the second housing and the cover screw shown in FIG. 10. FIG. 12 is a detailed view of the gap between the flange portion of the stator and the magnetic flux collection yoke shown in FIG. 6.

Hereinafter, the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the following detailed description of the invention (hereinafter referred to as embodiment). Furthermore, the constituent elements in the embodiments below include those that can be easily imagined by those skilled in the art, those that are substantially the same, and those that are within the so-called equivalent range. Furthermore, the components disclosed in the embodiments below can be combined as appropriate.

[Embodiment]
FIG. 1 is a schematic diagram for explaining a steering device 80 according to an embodiment. FIG. 2 is a perspective view of main parts of the steering device 80 according to the embodiment. Note that in FIG. 2, illustration of the electric motor 102 and the second pinion gear 88c is omitted in order to illustrate the rack bar 88b. As shown in FIG. 1, the steering device 80 includes a steering wheel 81, a steering shaft 82, a universal joint 84, a lower shaft 85, a universal joint 86, and a stub shaft in the order in which force applied by an operator is transmitted. 87, a steering gear 88, and a tie rod 89. Further, the steering device 80 includes a control device (hereinafter referred to as an ECU (Electronic Control Unit)) 100, a torque sensor 10, and an electric motor 102. Vehicle speed sensor 101 is provided in a vehicle and outputs a vehicle speed signal V to ECU 100 through CAN (Controller Area Network) communication.

Steering shaft 82 is connected to steering wheel 81 at one end and to universal joint 84 at the other end.

The lower shaft 85 is connected to a universal joint 84 at one end and to a universal joint 86 at the other end. The stub shaft 87 is connected to the universal joint 86 at one end and to the torque sensor 10 at the other end. The torque sensor 10 is connected to the stub shaft 87 at one end, and connected to the first pinion gear 88a of the steering gear 88 at the other end.

Specifically, the first pinion gear 88a is a shaft-shaped member having a gear 88ag (see FIG. 4) that engages with a rack bar 88b (described later) at the end opposite to the side connected to the stub shaft 87. The stub shaft 87 and the first pinion gear 88a are connected via a torsion bar 87a (see FIG. 4). The torsion bar 87a has one end connected to the stub shaft 87 and the other end connected to the first pinion gear 88a, and the torsion bar 87a transmits rotational torque between the stub shaft 87 and the first pinion gear 88a.

The torque sensor 10 is a torque detection device that detects torque acting on a shaft connected to the torque sensor 10, and is transmitted between the stub shaft 87 and the first pinion gear 88a via the torsion bar 87a. Detect rotational torque. That is, the stub shaft 87 and the first pinion gear 88a, which are connected via the torsion bar 87a, are shafts to be detected when torque is detected by the torque sensor 10.

Steering gear 88 includes a first pinion gear 88a, a rack bar 88b, and a second pinion gear 88c. The first pinion gear 88a is connected to the stub shaft 87 via a torsion bar 87a. The rack teeth 88bg (see FIG. 4) of the rack bar 88b mesh with the gear 88ag (see FIG. 4) of the first pinion gear 88a. Furthermore, the rack bar 88b meshes with the second pinion gear 88c at a position different from that of the first pinion gear 88a.

An electric motor 102 is connected to the second pinion gear 88c via a worm reduction device (not shown), and the second pinion gear 88c is rotated by the driving force transmitted from the electric motor 102. The electric motor 102 rotates the second pinion gear 88c via a worm reduction device (not shown). The electric motor 102 is, for example, a brushless motor, but may also be a motor equipped with a brush (slider) and a commutator (commutator).

The steering gear 88 converts the rotational motion transmitted to the first pinion gear 88a and the second pinion gear 88c into linear motion using a rack bar 88b disposed inside the rack housing 90. The steering device 80 according to the present embodiment is of a dual pinion assist type in which the rack bar 88b moves in a straight line by rotational movement transmitted from the first pinion gear 88a and the second pinion gear 88c. Tie rod 89 is connected to rack bar 88b. That is, the steering device 80 is a rack and pinion type electric power steering device.

The torque sensor 10 detects the driver's steering force transmitted to the steering shaft 82 via the steering wheel 81 as steering torque. Vehicle speed sensor 101 detects the traveling speed (vehicle speed) of a vehicle on which steering device 80 is mounted. Electric motor 102, torque sensor 10, and vehicle speed sensor 101 are electrically connected to ECU 100.

ECU 100 controls the operation of electric motor 102. Further, the ECU 100 acquires signals from each of the torque sensor 10 and the vehicle speed sensor 101. That is, the ECU 100 acquires the steering torque T from the torque sensor 10 and the vehicle speed signal V of the vehicle from the vehicle speed sensor 101. The ECU 100 is supplied with power from a power supply device (for example, a vehicle-mounted battery) 104 while an ignition switch 103 is in an on state. The ECU 100 calculates an auxiliary steering command value of the assist command based on the steering torque T and the vehicle speed signal V. The ECU 100 then adjusts the electric power value X supplied to the electric motor 102 based on the calculated auxiliary steering command value. The ECU 100 acquires, as operation information Y, information on the induced voltage from the electric motor 102 or information output from a rotation detection device such as a resolver provided in the electric motor 102.

The operator's (driver's) steering force input to the steering wheel 81 is transmitted to the first pinion gear 88a. The steering force transmitted to the first pinion gear 88a is transmitted to the tie rod 89 via the steering gear 88, displacing the wheels.

Furthermore, the operator's steering force input to the steering wheel 81 is transmitted to the torque sensor 10 arranged in a steering force transmission path from the steering wheel 81 to the first pinion gear 88a. At this time, the ECU 100 acquires the steering torque T from the torque sensor 10 and the vehicle speed signal V from the vehicle speed sensor 101. The ECU 100 then controls the operation of the electric motor 102. The auxiliary steering torque generated by the electric motor 102 is transmitted to the second pinion gear 88c.

The auxiliary steering torque transmitted to the second pinion gear 88c is transmitted to the tie rod 89 via the steering gear 88, displacing the wheels. That is, in addition to the operator's steering force transmitted to the rack bar 88b via the first pinion gear 88a, the steering device 80 receives assistance from the electric motor 102 transmitted to the rack bar 88b via the second pinion gear 88c. Steering torque is also used to displace the wheels.

As shown in FIG. 1, the steering device 80 is of a dual pinion type in which assist force is applied to the second pinion gear 88c, but the steering device 80 is not limited thereto. The steering device 80 may be, for example, a column assist type electric power steering device in which an assist force is applied to the steering shaft 82, or a single pinion assist type electric power steering device in which an assist force is applied to the first pinion gear 88a. Alternatively, a rack assist type electric power steering device may be used, such as a ball screw type electric power steering device that applies an assist force to the rack bar 88b without using a pinion.

FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG. 4 is a sectional view taken along line BB in FIG. In addition, in the following description, the axial direction of the stub shaft 87 and the first pinion gear 88a in which the torque sensor 10 is arranged will be described as the axial direction of the torque sensor 10 as well. Similarly, the circumferential direction centered on the axial center of the stub shaft 87 and the first pinion gear 88a is also described as the circumferential direction in the torque sensor 10, and the circumferential direction centered on the axial center of the stub shaft 87 and the first pinion gear 88a The radial direction will be described as the radial direction in the torque sensor 10 as well.

The housing 20 and the second housing 30 are arranged around a portion of the stub shaft 87 and the first pinion gear 88a that are connected via the torsion bar 87a. The housing 20 is arranged at a position closer to the first pinion gear 88a in the axial direction and mainly covers the first pinion gear 88a, and the second housing 30 is arranged at a position closer to the stub shaft 87 in the axial direction. It mainly covers the stub shaft 87. In other words, the stub shaft 87 and the first pinion gear 88a are at least partially disposed inside the housing 20 and the second housing 30, and the stub shaft 87 is at least partially disposed inside the second housing 30. The first pinion gear 88a is disposed at least partially inside the housing 20. The second housing 30 is attached to the housing 20 with mounting bolts 37, thereby fixing the second housing 30 to the housing 20.

A bearing 70 is disposed inside the housing 20, and the bearing 70 is disposed between the first pinion gear 88a and the housing 20. The first pinion gear 88a is rotatably supported by the housing 20 via a bearing 70 disposed between the first pinion gear 88a and the housing 20. That is, the inner circumferential surface side of the bearing 70 is assembled to the first pinion gear 88a such that it cannot move relative to the axial direction of the first pinion gear 88a, and the outer circumferential surface side of the bearing 70 assembled to the first pinion gear 88a is assembled to the housing. It is located at 20. Since the bearing 70 is thus interposed between the first pinion gear 88a and the housing 20, the first pinion gear 88a is rotatably supported by the housing 20 via the bearing 70.

Further, a bearing 75 is arranged inside the second housing 30, and the bearing 75 is arranged between the stub shaft 87 and the second housing 30. The stub shaft 87 is rotatably supported by the second housing 30 via a bearing 75 disposed between the stub shaft 87 and the second housing 30 . That is, the inner circumferential surface side of the bearing 75 is assembled to the stub shaft 87 so as not to be relatively movable in the axial direction of the stub shaft 87, and the outer circumferential surface side of the bearing 75 assembled to the stub shaft 87 is disposed in the second housing 30. ing. Since the bearing 75 is thus interposed between the stub shaft 87 and the second housing 30, the stub shaft 87 is rotatably supported by the second housing 30 via the bearing 75.

The first pinion gear 88a is rotatably supported by the housing 20, and the stub shaft 87 is rotatably supported by the second housing 30, so the first pinion gear 88a and the stub shaft are connected via the torsion bar 87a. The shaft 87 is integrally supported by the housing 20 and the second housing 30 so as to be freely rotatable.

The housing 20 and the second housing 30 are attached to the vehicle body in a non-rotatable state, and the stub shaft 87 and the first pinion are supported by a bearing 70 disposed in the housing 20 and a bearing 75 disposed in the second housing 30. The gear 88a is rotatably supported.

Further, a seal member 76 is arranged between the stub shaft 87 and the second housing 30. The seal member 76 is arranged between the stub shaft 87 and the second housing 30 at a position opposite to the side where the first pinion gear 88a is located with respect to the bearing 75 in the axial direction. In this embodiment, the steering device 80 is arranged such that the side where the stub shaft 87 is located is on the upper side, and the side where the first pinion gear 88a is located is on the lower side. Therefore, the seal member 76 is disposed near the upper end of the second housing 30, and can prevent water or the like from entering the second housing 30 from above the second housing 30.

The housing 20 also covers the portion of the first pinion gear 88a that engages with the rack bar 88b. That is, a gear 88ag that engages with the rack bar 88b is formed in the first pinion gear 88a at a position near the end opposite to the end connected to the stub shaft 87 in the axial direction, and the gear 88ag meshes with the rack bar 88b. is formed to also cover the end of the first pinion gear 88a on the side where the gear 88ag is formed.

The housing 20 also covers a rack bar 88b that meshes with the first pinion gear 88a. Therefore, the rack bar 88b is covered with the housing 20 together with the first pinion gear 88a, with the rack teeth 88bg formed on the rack bar 88b meshing with the gear 88ag formed on the first pinion gear 88a. 20.

Furthermore, a through hole 26 is formed in the housing 20 at a position opposite to the side of the rack bar 88b that engages with the gear 88ag of the first pinion gear 88a. A pressing member 91, a spring 92, and a sealing member 93 are housed in the through hole 26. The pressing member 91 is in contact with the rack bar 88b from the opposite side of the rack bar 88b from the side where the first pinion gear 88a is located. The sealing member 93 is arranged at the opening of the through hole 26 to seal the opening.

The spring 92 is made of a compression spring and is disposed between the sealing member 93 and the pressing member 91 in a compressed state between the sealing member 93 and the pressing member 91 . Therefore, the pressing member 91 is pressed against the rack bar 88b by the urging force from the spring 92, and the surface of the rack bar 88b on which the rack teeth 88bg are formed is the first It is pressed against gear 88ag of pinion gear 88a. As a result, the rack bar 88b maintains a state in which the rack teeth 88bg are engaged with the gear 88ag of the first pinion gear 88a.

The torque sensor 10 is disposed within the second housing 30, and includes a stub shaft 87 that is a first shaft, and a first pinion gear 88a that is a second shaft that is connected to the stub shaft 87 via a torsion bar 87a. is located near the end of the Both the stub shaft 87 and the first pinion gear 88a are shafts having hollow portions, and the end of one shaft enters inside the shaft from the end of the other shaft. In this embodiment, the stub shaft 87 is inserted inside the first pinion gear 88a.

The torsion bar 87a is arranged from the inside of the stub shaft 87 to the inside of the first pinion gear 88a, and has one end connected to the stub shaft 87 and the other end connected to the first pinion gear 88a. That is, the stub shaft 87 and the first pinion gear 88a are not directly connected, but are connected via the torsion bar 87a, which is a shaft-shaped member. Therefore, the stub shaft 87 and the first pinion gear 88a can rotate relative to each other, and when the torsion bar 87a is twisted, the stub shaft 87 and the first pinion gear It rotates relative to the gear 88a.

The torque sensor 10 is disposed near the end of the stub shaft 87 and the first pinion gear 88a, which are connected via the torsion bar 87a, and the relative relationship between the stub shaft 87 and the first pinion gear 88a is By detecting the angle of rotation, it is possible to detect the torque acting between the stub shaft 87 and the first pinion gear 88a.

The torque sensor 10 includes a magnet 55, a stator 50, and a magnetic flux collecting yoke 43. The magnet 55 and the stator 50 are separately attached to a stub shaft 87 and a first pinion gear 88a. The magnetic flux collecting yoke 43 is included in the magnetic flux collecting yoke assembly 40 , and the magnetic flux collecting yoke 43 is fixed to the second housing 30 by attaching the magnetic flux collecting yoke assembly 40 to the second housing 30 . The torque sensor 10 configured as described above is capable of detecting torque based on changes in magnetism when the torsion bar 87a is twisted and the stub shaft 87 and the first pinion gear 88a rotate relative to each other. It has become.

FIG. 5 is a schematic diagram illustrating an overview of the magnet 55, stator 50, and magnetic collecting yoke 43 included in the torque sensor 10. One of the magnet 55 and the stator 50 included in the torque sensor 10 is attached to the first shaft, and the other is attached to the second shaft. In this embodiment, the magnet 55 is attached to the stub shaft 87, which is the first shaft, and the stator 50 is attached to the first pinion gear 88a, which is the second shaft. Among these, the magnet 55 is formed in a substantially cylindrical shape, and is a multipolar magnet in which a plurality of N poles and S poles are alternately arranged in the circumferential direction.

The stator 50 has a flange portion 51 and teeth portions 52. The flange portion 51 is formed in an annular plate shape with the thickness direction being the axial direction. The teeth portion 52 extends from the inner peripheral portion of the annular flange portion 51 toward the axial direction of the flange portion 51, and is formed in a plate shape such that the thickness direction of the plate is oriented in the radial direction of the flange portion 51. has been done. Moreover, the teeth portions 52 are arranged such that a plurality of teeth portions 52 are arranged at intervals in the circumferential direction of the flange portion 51.

The stator 50 formed in this way has a first stator 50a and a second stator 50b, which are a pair of stators 50 formed in the same shape, and the first stator 50a and the second stator 50b are different from each other. , each has a flange portion 51 and a tooth portion 52. That is, the first stator 50a has an annular first flange portion 51a and a plurality of first teeth portions 52a, and the second stator 50b has an annular second flange portion 51b and a plurality of second teeth portions 52a. It has teeth portions 52b. The first stator 50a and the second stator 50b are both attached to the same shaft, with their flange portions 51 located on the same axis, and the flange portion 51 facing away from the other stator 50. , in this embodiment, are both attached to the first pinion gear 88a.

That is, the first stator 50a is arranged such that the first tooth portion 52a extends from the first flange portion 51a toward the second stator 50b, and the second stator 50b is arranged such that the second tooth portion 52b extends from the first flange portion 51a toward the second stator 50b. It is arranged in a direction extending from the flange portion 51b toward the first stator 50a. At that time, since a plurality of the first teeth portions 52a and the second teeth portions 52b are provided on the first flange portion 51a and the second flange portion 51b with an interval between them, the first stator 50a and the second stator 50b is combined so that the teeth portion 52 of the stator 50 itself is located in a portion where the teeth portion 52 of the other stator 50 is not located in the circumferential direction.

The magnet 55 attached to the stub shaft 87 is arranged inside the first stator 50a and the second stator 50b combined in this way. Further, the magnet 55 and the stator 50 are arranged with their axial directions coinciding with the axial directions of the stub shaft 87 and the first pinion gear 88a. Therefore, the magnet 55 and the stator 50 are attached to the stub shaft 87 and the first pinion gear 88a with the outer peripheral surface of the magnet 55 facing the teeth portion 52 of the stator 50. Placed. By arranging the magnet 55 and the stator 50 in this positional relationship, torque is transmitted between the stub shaft 87 and the first pinion gear 88a via the torsion bar 87a. When the gear 88a makes a small relative rotation, the magnetic flux acting on the stator 50 from the magnet 55 changes as the relative positional relationship between the magnet 55 and the stator 50 changes.

Furthermore, a magnetic flux collecting yoke 43 included in the magnetic flux collecting yoke assembly 40 is arranged near the stator 50 . The magnetic flux collecting yoke 43 is a member for detecting changes in the magnetic flux acting on the stator 50 from the magnet 55, and is arranged near the flange portion 51 of the stator 50. As the stator 50, a pair of a first stator 50a and a second stator 50b is provided. A pair is provided. That is, in the magnetic flux collecting yoke 43, the first magnetic flux collecting yoke 43a is disposed near the first flange portion 51a of the first stator 50a, and the second magnetic flux collecting yoke 43a is disposed near the second flange portion 51b of the second stator 50b. A magnetic flux collecting yoke 43b is arranged.

The pair of magnetic flux collecting yokes 43 are located between the two flange portions 51 of the stator 50, and overlap the flange portions 51 of the stator 50 with a gap in the axial direction. That is, the first magnetic flux collecting yoke 43a is arranged near the surface of the first flange 51a of the first magnetic collecting yoke 43a on which the second flange 51b is located, and the second magnetic collecting yoke 43b It is arranged near the surface of the second flange portion 51b of the magnetic flux collecting yoke 43b on which the first flange portion 51a is located. In this way, by positioning the magnetic flux collecting yoke 43 near the flange portion 51, the magnetic collecting yoke 43 can prevent the magnet 55 from rotating slightly when the stub shaft 87 and the first pinion gear 88a are slightly rotated relative to each other. It is possible to detect changes in the magnetic flux acting on the stator 50 from this point onward.

Furthermore, a Hall IC 44 is arranged between the two magnetic flux collecting yokes 43. The Hall IC 44 is arranged between the magnetic flux collecting yokes 43 at a position away from a portion of the magnetic flux collecting yokes 43 located near the flange portion 51 of the stator 50 . The Hall IC 44 is capable of detecting a change in magnetic flux density acting on the two magnetic flux collecting yokes 43, converting the detected change in magnetic flux density into an electrical signal, and outputting the electrical signal. Note that instead of the Hall IC, a magnetic sensor applying magnetoresistive effect or tunnel magnetoresistive effect can be used. In short, it is sufficient if the change in magnetic flux density that occurs between the magnetic flux collecting yokes 43 can be output as an electrical signal.

FIG. 6 is a detailed diagram of the surroundings of the torque sensor 10 shown in FIG. 3. Magnet 55 is attached to stub shaft 87 by first sleeve 56 . The first sleeve 56 is a cylindrical member, and the first sleeve 56 is attached to the stub shaft 87 by press-fitting the stub shaft 87 into the first sleeve 56 . The magnet 55 is fixed to the outer circumferential surface of the first sleeve 56 with, for example, an adhesive, so that the magnet 55 can rotate together with the stub shaft 87.

The stator 50 is attached to the first pinion gear 88a by a second sleeve 53 and a carrier 54. The second sleeve 53 is a cylindrical member, and the second sleeve 53 is attached to the first pinion gear 88a by press-fitting the first pinion gear 88a into the second sleeve 53. The carrier 54 is a cylindrical member, and is integrally formed with the second sleeve 53 by injection molding. Therefore, when the second sleeve 53 is attached to the first pinion gear 88a, the carrier 54 is also attached to the first pinion gear 88a together with the second sleeve 53.

The carrier 54 attached to the first pinion gear 88a by the second sleeve 53 is disposed at a position facing the stub shaft 87 from the first pinion gear 88a by being supported by the second sleeve 53. It is arranged at an outer position in the radial direction. Further, the carrier 54 is disposed at the same position in the axial direction as the magnet 55, and is disposed outside the magnet 55 in the radial direction.

The stator 50 is attached to a carrier 54 arranged in this manner. Specifically, in each of the first stator 50a and the second stator 50b, the teeth portion 52 is located inside the carrier 54 in the radial direction, and the flange portion 51 is located inside the carrier 54 in the radial direction. It is attached to the carrier 54 in a form that projects toward the user. As a result, the first stator 50a and the second stator 50b, which are the pair of stators 50, are both arranged at the same position in the axial direction as the magnet 55, and are arranged outside the magnet 55 in the radial direction.

Furthermore, the first stator 50a and the second stator 50b are attached to a carrier 54 that is integrally formed with the second sleeve 53 attached to the first pinion gear 88a, so they rotate together with the first pinion gear 88a. It is now possible. In other words, the stator 50 that is rotatably arranged integrally with the first pinion gear 88a includes a flange portion 51 that projects outward in the radial direction of the first pinion gear 88a, and It is fixed to gear 88a.

The pair of magnetic flux collecting yokes 43 are arranged so that the magnetic flux collecting yoke assembly 40 having the magnetic flux collecting yokes 43 is fixed to the second housing 30, and the second housing 30 is fixed to the housing 20. It is fixed to the housing 20 via the housing 30. That is, the magnetic flux collecting yoke 43 is arranged so as not to be movable relative to the housing 20.

A bearing storage recess 25, a cover screw storage recess 23, and a spigot recess 22 are formed on the inner surface of the housing 20. The bearing storage recess 25, the cover screw storage recess 23, and the spigot recess 22 formed on the inner surface of the housing 20 are formed at different positions in the axial direction. In this embodiment, the bearing storage recess 25, the cover screw storage recess 23, and the spigot recess 22 are formed in this order in the axial direction from the side where the rack bar 88b is located to the side where the second housing 30 is located. .

The bearing storage recess 25, the cover screw storage recess 23, and the spigot recess 22 are formed to have different sizes in the radial direction. is formed on the inner surface of the housing 20. Therefore, the bearing storage recess 25, the cover screw storage recess 23, and the spigot recess 22 are recessed outward in the radial direction, and the rack bar 88b is arranged from the side where the second housing 30 is located in the axial direction. It is formed as a concave portion that is concave toward the opposite side.

The bearing storage recess 25 can store a bearing 70 that supports the first pinion gear 88a. The bearing 70 has an outer ring 71 formed in an annular shape, an inner ring 72 formed in an annular shape with a smaller diameter than the outer ring 71, and a plurality of balls 73 arranged between the outer ring 71 and the inner ring 72. It is a so-called ball bearing. The inner ring 72 of the bearing 70 is assembled to the first pinion gear 88a, and the outer ring 71 of the bearing 70 is stored in the bearing storage recess 25. Therefore, the inner diameter of the bearing storage recess 25 is approximately the same size as the outer diameter of the outer ring 71 of the bearing 70.

Further, the bearing storage recess 25 has a surface that faces the surface of the outer ring 71 of the bearing 70 on the side where the rack bar 88b is arranged in the axial direction and abuts against the outer ring 71 of the bearing 70 from the axial direction. There is. Therefore, the outer ring 71 of the bearing 70 is fitted into the bearing storage recess 25, and the bearing is inserted into the bearing storage recess 25 by contacting the surface of the outer ring 71 of the bearing 70 on the side where the rack bar 88b is arranged in the axial direction. 70 is stored.

The cover screw storage recess 23 formed on the side of the bearing storage recess 25 on which the second housing 30 is located in the axial direction is formed to have a larger diameter than the bearing storage recess 25 . A female thread 24 is formed on the inner peripheral surface of the cover screw storage recess 23 . A cover screw 60 is stored in the cover screw storage recess 23 .

The cover screw 60 is formed in an annular shape with an inner diameter larger than the outer diameter of the first pinion gear 88a and an outer diameter approximately the same size as the inner diameter of the cover screw storage recess 23, and a male thread 61 is formed on the outer peripheral surface. There is. The cover screw 60 is stored in the cover screw storage recess 23 by having a male thread 61 on the outer peripheral surface screwed into the female thread 24 of the cover screw storage recess 23 . A first pinion gear 88a is arranged to pass in the axial direction inside the cover screw 60 stored in the cover screw storage recess 23.

The cover screw 60 stored in the cover screw storage recess 23 restricts the movement of the bearing 70 stored in the bearing storage recess 25 in the axial direction, and fixes the bearing 70 by sandwiching it between the housing 20 in the axial direction. That is, the cover screw 60 screws the male thread 61 formed on the outer circumferential surface into the female thread 24 of the cover screw storage recess 23 and tightens it toward the side where the bearing 70 is located, so that the outer ring 71 of the bearing 70 is tightened. , abuts against the surface on the side where the second housing 30 is located in the axial direction. This allows the cover screw 60 to axially sandwich the outer ring 71 of the bearing 70 between the surface of the bearing storage recess 25 formed in the housing 20 that contacts the outer ring 71 of the bearing 70 from the axial direction. Thus, the bearing 70 stored in the bearing storage recess 25 is fixed.

In other words, the bearing 70 is assembled into the housing 20 by axially sandwiching the outer ring 71 of the bearing 70 between the cover screw 60 and the bearing storage recess 25 while being stored in the bearing storage recess 25.

The pilot recess 22 formed on the side where the second housing 30 is located with respect to the cover screw storage recess 23 in the axial direction is formed to have a larger diameter than the diameter of the cover screw storage recess 23 . The pilot recess 22 is recessed to a predetermined depth in the axial direction on the inner circumferential surface of the housing 20 on the end side where the second housing 30 is disposed.

A spigot protrusion 32 that fits into the spigot recess 22 is formed on the second housing 30 fixed to the housing 20 . The pilot protrusion 32 is formed to protrude from the second housing 30 toward the side where the housing 20 is located in the axial direction. 20 is positioned in the radial direction.

The pilot protrusion 32 is formed in a cylindrical shape and protrudes from the second housing 30, and has an outer diameter slightly smaller than the inner diameter of the pilot recess 22. A groove into which an O-ring 34, which is a sealing member, is fitted is formed on the outer peripheral surface of the spigot convex part 32, and the spigot convex part 32 enters into the spigot recess 22 with the O-ring 34 fitted into the groove. . Thereby, in a state where the pilot convex portion 32 enters the pilot concave portion 22, the sealing performance between the housing 20 and the second housing 30 is ensured by the O-ring 34.

Further, the second housing 30 is formed with a flat portion 31 that abuts against the housing 20 in the axial direction. , axial positioning is performed with respect to the housing 20. Specifically, the flat portion 31 of the second housing 30 is formed around the base of the pilot convex portion 32 and is a flat surface facing the housing 20 in the axial direction. On the other hand, a flat part 21 that faces the flat part 31 of the second housing 30 in the axial direction is formed at the end of the housing 20 on the side where the second housing 30 is located.

When fixing the second housing 30 to the housing 20 by inserting the spigot convex part 32 of the second housing 30 into the spigot concave part 22 of the housing 20, the flat part 31 of the second housing 30 touches the flat part 21 of the housing 20. By abutting, the second housing 30 is positioned with respect to the housing 20 in the axial direction. Thereby, the second housing 30 is positioned and fixed in the radial direction and axial direction with respect to the housing 20.

Further, the magnetic flux collecting yoke 43 is disposed in the second housing, and the second housing 30 is located on the opposite side of the housing 20 in the axial direction from the side where the bearing 70 is disposed with respect to the cover screw 60. By being fixed to the housing 20 at the position, the magnetic flux collecting yoke 43 is fixed to the housing 20 via the second housing 30.

When the second housing 30 is fixed to the housing 20, the spigot convex portion 32 of the second housing 30 that enters the spigot recess 22 of the housing 20 is axially oriented with respect to the cover screw 60 stored in the cover screw storage recess 23. The bearing 70 is disposed on the opposite side of the bearing 70 . In this way, the spigot convex portion 32 located on the opposite side of the cover screw 60 to the side where the bearing 70 is located in the axial direction prevents the cover screw 60 from moving in the direction in which the cover screw 60 separates from the bearing 70. It is also provided as a regulating member 33 for regulating.

Specifically, the inner diameter of the spigot convex portion 32 is smaller than the outer diameter at the bearing side end 63 of the cover screw 60, which is the end on the side where the second housing 30 is located in the axial direction. Therefore, when the cover screw 60 moves in the axial direction to the side where the spigot convex part 32 is located, the spigot convex part 32 can come into contact with the cover screw 60.

In this way, the spigot convex portion 32 that comes into contact with the cover screw 60 can restrict the movement of the cover screw 60 in the direction away from the bearing 70 in the axial direction, and the spigot convex portion 32 is configured to It is established as. In other words, the second housing 30 is provided with a regulating member 33 that regulates the movement of the cover screw 60 in the direction away from the bearing 70 , and the regulating member 33 is formed by the spigot convex portion 32 .

FIG. 7 is a detailed view of a portion where the magnetic flux collecting yoke assembly 40 is attached to the second housing 30. FIG. 8 is a detailed view showing a state before the magnetic flux collecting yoke assembly 40 is attached to the second housing 30 shown in FIG. 7. FIG. FIG. 9 is a perspective cross-sectional view at a position where the magnetic flux collecting yoke 43 in FIG. 7 is arranged. The magnetic flux collecting yoke 43 is included in a magnetic flux collecting yoke assembly 40 that configures the magnetic flux collecting yoke 43 and the Hall IC 44 (see FIG. 6) as an integrated unit, and the magnetic flux collecting yoke assembly 40 is fixed to the second housing 30. As a result, the magnetic flux collecting yoke 43 is fixed to the second housing 30. Specifically, the magnetic flux collecting yoke assembly 40 has a magnetic flux collecting yoke housing 41 which is a casing of the magnetic flux collecting yoke assembly 40, and the magnetic flux collecting yoke 43 and the Hall IC 44 are housed in the magnetic flux collecting yoke housing 41. .

A sensor opening 35 that opens in the radial direction with respect to the second housing 30 is formed in a portion of the second housing 30 to which the magnetic flux collecting yoke assembly 40 is attached. Further, a screw hole 36 is formed on the side of the sensor opening 35 of the second housing 30, into which a mounting bolt 42 for attaching the magnetic flux collecting yoke assembly 40 to the second housing 30 is screwed.

The magnetic flux collecting yoke assembly 40 is constructed by inserting the magnetic flux collecting yoke housing 41 housing the magnetic flux collecting yoke 43 into the sensor opening 35 from the outside of the second housing 30 and attaching it to the second housing 30 with the mounting bolts 42. 2 housing 30.

The magnetic flux collecting yoke housing 41 inserted into the sensor opening 35 and fixed to the second housing 30 has a magnetic flux collecting yoke 43 housed in the magnetic flux collecting yoke housing 41 between the respective flange portions 51 of the pair of stators 50. It is fixed to the second housing 30 while being inserted into the second housing 30 . As a result, in the magnetic flux collecting yoke 43, each of the first magnetic flux collecting yoke 43a and the second magnetic flux collecting yoke 43b is inserted between the flange portions 51 of the pair of stators 50, and has a gap in the axial direction. It is fixed to the second housing 30 while overlapping the flange portion 51 of the stator 50 .

When the magnetic flux collecting yoke assembly 40 is attached to the second housing 30, the connection terminal 45, which outputs the torque detected by the torque sensor 10 to the outside as an electric signal, is exposed to the outside of the second housing 30. . A signal line for transmitting an electrical signal from the torque sensor 10 to the ECU 100 is connected to the connection terminal 45 .

FIG. 10 is a detailed view showing a portion where the cover screw 60 shown in FIG. 6 and the bearing 70 are in contact with each other. FIG. 11 is a detailed view of the gap between the pilot convex portion 32 of the second housing 30 and the cover screw 60 shown in FIG. 10. The bearing 70 that rotatably supports the first pinion gear 88a is assembled using a caulking member 74 so that the inner ring 72 cannot move relative to the first pinion gear 88a. Specifically, the first pinion gear 88a is formed with a protrusion 88ap that protrudes from the outer peripheral surface, and the bearing 70 is arranged so that one end of the inner ring 72 in the axial direction abuts against the protrusion 88ap. The caulking member 74 is disposed at the other end of the inner ring 72 in the axial direction, and is fixed to the first pinion gear 88a by caulking while abutting against the inner ring 72. As a result, the bearing 70 is assembled such that the inner ring 72 is axially sandwiched between the protrusion 88ap of the first pinion gear 88a and the caulking member 74, and cannot be moved relative to the first pinion gear 88a.

The cover screw 60 stored in the cover screw storage recess 23 formed in the housing 20 has an inner diameter smaller than the outer diameter of the inner ring 72 of the bearing 70. In other words, the cover screw 60 restricts the movement of the bearing 70 in the axial direction by coming into contact with the outer ring 71 of the bearing 70. It is formed smaller than the diameter.

The cover screw 60 formed in this manner is threaded into the cover screw storage recess 23, and by tightening the threaded screw, the bearing 70 stored in the bearing storage recess 25 is stored. It is possible to sandwich it between the recess 25 and the recess 25. That is, by tightening the cover screw 60 in the axial direction toward the side where the bearing 70 is located, the bearing side end 63, which is the end of the cover screw 60 on the side where the bearing 70 is located, is aligned with the outer ring 71 of the bearing 70. comes into contact with. Thereby, the cover screw 60 can restrict relative movement of the bearing 70 in the axial direction with respect to the housing 20 by the cover screw 60 and the bearing storage recess 25.

Since the bearing 70 is assembled so that it cannot move relative to the first pinion gear 88a, when the relative movement of the bearing 70 with respect to the housing 20 is restricted by the cover screw 60, the first pinion gear 88a to which the bearing 70 is assembled also moves. , relative movement in the axial direction with respect to the housing 20 is not possible. The cover screw 60 thus restricts the relative movement of the bearing 70 in the axial direction with respect to the housing 20, thereby restricting the relative movement of the first pinion gear 88a with respect to the housing 20 in the axial direction.

When the bearing side end 63 of the cover screw 60 is in contact with the outer ring 71 of the bearing 70 and the bearing 70 is axially sandwiched between the cover screw 60 and the bearing housing recess 25, the second housing 30 side of the cover screw 60 is in contact with the outer ring 71 of the bearing 70. An axial gap is formed between the sensor side end 62 and the spigot convex portion 32 of the second housing 30 . In other words, since the spigot convex portion 32 of the second housing 30 is also provided as a regulating member 33 that regulates the movement of the cover screw 60, when the bearing 70 is sandwiched between the cover screw 60 and the bearing storage recess 25, An axial gap is formed between the sensor side end 62 of the cover screw 60 and the regulating member 33.

FIG. 12 is a detailed view of the gap between the flange portion 51 of the stator 50 and the magnetic flux collecting yoke 43 shown in FIG. In the torque sensor 10 disposed inside the second housing 30, a pair of magnetic flux collecting yokes 43 are located between the respective flange parts 51 of the pair of stators 50, and the magnetic flux collecting yokes 43 are located between the flange parts 51 of the stator 50 and It is arranged with an axial gap between it and the magnetic yoke 43. That is, the first flange portion 51a of the first stator 50a and the first magnetic flux collecting yoke 43a are arranged with an axial gap therebetween, and the second flange portion 51b of the second stator 50b and the first The magnetic flux collecting yoke 43b is arranged with an axial gap therebetween.

The axial gap Gap2 between the flange portion 51 of the stator 50 and the magnetic flux collecting yoke 43 is between the regulating member 33 formed by the spigot convex portion 32 of the second housing 30 and the sensor side end of the cover screw 60. 62, which is larger than the axial gap Gap1 between the two. In this case, the axial gap Gap2 between the flange part 51 of the stator 50 and the magnetic flux collecting yoke 43 is the axial gap between the first flange part 51a of the first stator 50a and the first magnetic flux collecting yoke 43a. Gap2 and an axial gap Gap2 between the second flange portion 51b of the second stator 50b and the second magnetic flux collecting yoke 43b.

Specifically, when the cover screw 60 and the bearing 70 are in contact with each other, the axial gap Gap2 between the flange portion 51 of the stator 50 and the magnetic flux collecting yoke 43 is the axial gap Gap2 between the flange portion 51 and the magnetic collecting yoke 43. The minimum value of the gap Gap2 is larger than the axial gap Gap1 between the regulating member 33 and the cover screw 60. The axial gap Gap2 between the flange portion 51 of the stator 50 and the magnetic flux collecting yoke 43 is, for example, within the range of 0.6 to 1.2 mm, and the axial gap between the regulating member 33 and the cover screw 60 is The gap Gap1 is, for example, 0.5 mm or less. That is, when the cover screw 60 is in contact with the bearing 70 and the bearing 70 is sandwiched between the cover screw 60 and the bearing storage recess 25, the gap Gap2 between the flange portion 51 of the stator 50 and the magnetic flux collecting yoke 43 is such that the stator 50 In any state when rotating together with the first pinion gear 88a, the gap Gap1 in the axial direction between the regulating member 33 and the cover screw 60 is larger.

In other words, the regulating member 33 formed by the spigot convex portion 32 of the second housing 30 reduces the axial gap between the cover screw 60 and the regulating member 33 when the cover screw 60 and the bearing 70 are in contact with each other. Gap1 is smaller than the minimum value of the axial gap Gap2 between the flange portion 51 of the stator 50 and the magnetic flux collecting yoke 43.

Next, the operation of the steering device 80 will be explained. When the steering wheel 81 is operated while driving the vehicle in which the steering device 80 is mounted, the steering force applied to the steering wheel 81 is transmitted from the steering wheel 81 to the steering shaft 82. The steering force transmitted to the steering shaft 82 is transmitted as a steering torque from the steering shaft 82 to the lower shaft 85, and from the lower shaft 85 via the stub shaft 87 to the first pinion gear 88a. As a result, the steering gear 88 having the first pinion gear 88a converts the rotational motion transmitted from the first pinion gear 88a into a linear motion of the rack bar 88b, and operates the tie rod 89.

Further, the steering device 80 according to the present embodiment includes an electric motor 102 that generates an auxiliary steering torque to assist the driver's steering. The electric motor 102 generates auxiliary steering torque based on the steering torque detected by the torque sensor 10 disposed between the stub shaft 87 and the first pinion gear 88a.

The torque sensor 10 detects the steering torque applied to the stub shaft 87 based on the angle of relative rotation when the stub shaft 87 and the first pinion gear 88a rotate relative to each other. That is, since the stub shaft 87 and the first pinion gear 88a are connected via the torsion bar 87a, when steering torque is applied to the stub shaft 87, the stub shaft 87 and the first pinion gear 88a Steering torque is transmitted between the torsion bars 87a. At this time, the torsion bar 87a is slightly twisted, so that the stub shaft 87 and the first pinion gear 88a rotate relative to each other.

The torque sensor 10 has the magnet 55 attached to the stub shaft 87 and the stator 50 attached to the first pinion gear 88a, so that when the stub shaft 87 and the first pinion gear 88a rotate relative to each other, the torque sensor 10 is activated. The magnet 55 and stator 50 included in the motor 10 also rotate relative to each other. The relative rotation angle between the magnet 55 and the stator 50 increases as the steering torque acting between the stub shaft 87 and the first pinion gear 88a increases.

When the magnet 55 and the stator 50 rotate relative to each other, the magnetic flux acting on the stator 50 from the magnet 55 changes. The magnetic flux collecting yoke 43 disposed near the stator 50 is capable of detecting changes in the magnetic flux acting on the stator 50 from the magnet 55. Therefore, when the magnet 55 and the stator 50 rotate relative to each other due to the relative rotation between the stub shaft 87 and the first pinion gear 88a, the magnetic flux collecting yoke 43 disposed near the stator 50 is separated from the magnet 55. Changes in the magnetic flux acting on the stator 50 can be detected.

In this way, the magnetic flux acting on the stator 50 from the magnet 55, which is detected by the magnetic flux collection yoke 43, changes depending on the angle of relative rotation between the magnet 55 and the stator 50. The Hall IC 44 converts the magnetic flux detected by the magnetic collecting yoke 43, which changes depending on the angle of relative rotation between the magnet 55 and the stator 50, into an electric signal, and transmits it from the connection terminal 45 to the outside of the second housing 30. The information is transmitted to the ECU 100.

The ECU 100 operates the electric motor 102 based on the electric signal transmitted from the torque sensor 10, and causes the electric motor 102 to generate an auxiliary steering torque. That is, the electric signal transmitted from the Hall IC 44 of the torque sensor 10 to the ECU 100 changes depending on the angle of relative rotation between the magnet 55 and the stator 50, and acts between the stub shaft 87 and the first pinion gear 88a. It changes based on the steering torque T. Therefore, the ECU 100 uses the electrical signal transmitted from the Hall IC 44 of the torque sensor 10 as information that changes depending on the steering torque T acting on the stub shaft 87 and the first pinion gear 88a, and uses the electrical signal transmitted from the Hall IC 44 to The electric power value X supplied to the electric motor 102 is adjusted based on the signal, and the electric motor 102 is caused to generate an auxiliary steering torque.

That is, the ECU 100 obtains a steering torque T signal from the torque sensor 10, a vehicle speed signal V of the vehicle from the vehicle speed sensor 101, and further obtains operation information of the electric motor 102 from a rotation detection device provided in the electric motor 102. Y, and causes the electric motor 102 to generate an auxiliary steering torque based on the operation information Y, the steering torque T, and the vehicle speed signal V. The auxiliary steering torque generated by the electric motor 102 is transmitted to the second pinion gear 88c. Steering gear 88 having second pinion gear 88c converts the rotational motion transmitted from second pinion gear 88c into linear motion of rack bar 88b. Thereby, the steering force applied by the driver to the steering wheel 81 is assisted by the auxiliary steering torque generated by the electric motor 102.

Further, when the driver steers the steering wheel 81, the stub shaft 87 and the first pinion gear 88a rotate due to the steering force being transmitted thereto. The housing 20 and the second housing 30 in which the torque sensor 10 is disposed are attached to the vehicle body in a non-rotatable state, and the stub shaft 87 and the first pinion gear 88a are connected to each other via the bearing 70 and the bearing 75. , is rotatably supported by the housing 20 and the second housing 30.

Here, the bearing 70 is axially sandwiched and fixed between the cover screw 60 and the housing 20 by the cover screw 60 coming into contact with the bearing 70. The position of the bearing 70 in the axial direction is regulated by screwing into the female thread 24 formed on the inner circumferential surface of the bearing 70 . That is, the cover screw 60 that is screwed into the female thread 24 of the cover screw storage recess 23 is in contact with the outer ring 71 of the bearing 70 by being tightened toward the side where the bearing 70 is located.

Therefore, when the cover screw 60 is loosened from the bearing 70 and the cover screw 60 separates from the outer ring 71 of the bearing 70 in the axial direction, the cover screw 60 cannot restrict the position of the bearing 70 in the axial direction. It disappears. For example, if vibrations from when the vehicle is running are transmitted to the cover screw 60 over a long period of time, and the cover screw 60 is separated from the bearing 70 as the tightening of the cover screw 60 gradually loosens, the bearing 70 It becomes possible to move in the direction to the side where the cover screw 60 is located. That is, the bearing 70 can move relative to the housing 20 in the axial direction.

When the bearing 70 can move relative to the housing 20 in the axial direction, the first pinion gear 88a to which the bearing 70 is assembled can also move relative to the housing 20 in the axial direction. Become. The first pinion gear 88a is connected to the stub shaft 87 via a stub shaft 87, and the second housing 30 is fixed to the housing 20 with mounting bolts 37. Therefore, when it becomes possible for the first pinion gear 88a to move relative to the housing 20 in the axial direction, the first pinion gear 88a and the stub shaft 87 are connected to the housing 20 and the second housing 30. On the other hand, it becomes possible to move relative to each other in the axial direction as a unit.

The torque sensor 10 that detects steering torque is arranged with an axial gap between the flange portion 51 of the stator 50 and the magnetic flux collecting yoke 43, but the stator 50 is fixed to the first pinion gear 88a. , the magnetic flux collecting yoke 43 is fixed to the second housing 30. Therefore, when the first pinion gear 88a moves relative to the housing 20 and the second housing 30 in the axial direction, the stator 50 fixed to the first pinion gear 88a is fixed to the second housing 30. It moves relative to the magnetic flux collecting yoke 43 in the axial direction. In this case, as the stator 50 and the magnetic flux collecting yoke 43 move relative to each other in the axial direction, the axial gap between the flange portion 51 of the stator 50 and the magnetic flux collecting yoke 43 changes.

When the gap between the flange portion 51 of the stator 50 and the magnetic flux collecting yoke 43 changes, the magnetic flux acting on the stator 50 from the magnet 55 fixed to the stub shaft 87 cannot be appropriately detected by the magnetic flux collecting yoke 43. In some cases, the steering torque cannot be detected properly. In other words, if the distance between the magnetic flux collecting yoke 43 and the flange portion 51 of the stator 50 becomes too short, the performance of the magnetic flux collecting yoke 43 in detecting magnetic flux will deteriorate. Therefore, when the distance between the flange portion 51 of the stator 50 and the magnetic flux collecting yoke 43 becomes too close, the torque sensor 10 detects the steering torque based on the magnetic flux acting on the stator 50 from the magnet 55. Accurate detection becomes impossible.

Further, when the flange portion 51 of the stator 50 and the magnetic flux collecting yoke 43 come close to each other, and the flange portion 51 and the magnetic flux collecting yoke 43 interfere with each other, the magnetic flux collecting yoke 43 and the stator 50 are deformed, which is detected by the magnetic flux collecting yoke 43. It is conceivable that the magnetic flux caused by this phenomenon will be an abnormal value. In this case, the steering torque detected by the torque sensor 10 will be output as an abnormal value. Therefore, in the present embodiment, the movement of the bearing 70 in the axial direction when the cover screw 60 is loosened is regulated by limiting the amount of movement of the cover screw 60 in the axial direction, and the flange of the stator 50 is This suppresses the distance between the portion 51 and the magnetic flux collecting yoke 43 from becoming too close.

In other words, in the torque sensor 10, the regulating member 33 is arranged on the opposite side of the cover screw 60 to the side where the bearing 70 is arranged, and the flange portion 51 of the stator 50 is in contact with the cover screw 60 and the bearing 70. The minimum value of the axial gap Gap2 with the magnetic flux collecting yoke 43 is larger than the axial gap Gap1 between the cover screw 60 and the regulating member 33. Therefore, even if the cover screw 60 moves to the side opposite to the side where the bearing 70 is located due to loosening of the cover screw 60, the cover screw 60 will be able to close the gap Gap1 between the cover screw 60 and the regulating member 33. After moving by that amount, it comes into contact with the regulating member 33. That is, the amount of movement of the cover screw 60 in the axial direction when the cover screw 60 is loosened is the amount of movement of the cover screw 60 in the axial direction between the cover screw 60 and the regulating member 33 when the cover screw 60 and the bearing 70 are in contact with each other. The size of the gap in the direction is Gap1.

When the bearing 70 moves toward the side where the cover screw 60 is located relative to the housing 20 due to loosening of the cover screw 60, the bearing 70 can move to a position where it abuts the cover screw 60. Therefore, the amount of movement of the bearing 70 in the axial direction when the cover screw 60 is loosened is the same as the amount of movement of the bearing 70 in the axial direction when the cover screw 60 and the bearing 70 are in contact with each other. The size of the gap Gap1 in the axial direction with respect to the member 33 is set.

Furthermore, since the bearing 70 is assembled so that it cannot move relative to the first pinion gear 88a in the axial direction, when the cover screw 60 is loosened, the first pinion gear 88a is moved in the axial direction with respect to the housing 20. The amount of movement is the same as the amount of movement of the bearing 70.

Furthermore, since the stator 50 is fixed to the first pinion gear 88a, the amount of movement of the stator 50 in the axial direction when the cover screw 60 is loosened is also the same amount as the amount of movement of the bearing 70. ing. That is, the amount of movement of the stator 50 in the axial direction with respect to the second housing 30 when the cover screw 60 is loosened is the amount of movement of the stator 50 in the axial direction with respect to the second housing 30 when the cover screw 60 and the regulating member 33 are in contact with each other. The size of the axial gap Gap1 between the two is set.

On the other hand, when the cover screw 60 and the bearing 70 are in contact with each other, the minimum value of the axial gap Gap2 between the flange portion 51 of the stator 50 and the magnetic flux collecting yoke 43 is It is larger than the axial gap Gap1 between them. In other words, the minimum value of the axial gap Gap2 between the flange portion 51 of the stator 50 and the magnetic flux collecting yoke 43 when the cover screw 60 and the bearing 70 are in contact with each other is the This is larger than the amount of movement in the axial direction.

Therefore, when the cover screw 60 that restricts the movement of the bearing 70 is loosened, the bearing 70 moves relative to the housing 20 in the axial direction, and the first pinion gear 88a and the stator 50 are moved together with the bearing 70 to the magnetic flux collecting yoke 43. On the other hand, even when relatively moving in the axial direction, interference of the flange portion 51 of the stator 50 with the magnetic flux collecting yoke 43 can be suppressed. That is, even if the cover screw 60 that restricts the movement of the bearing 70 becomes loose, a state in which there is a gap between the flange portion 51 of the stator 50 and the magnetic flux collecting yoke 43 can be maintained. As a result, even if the cover screw 60 that fixes the bearing 70 to the housing 20 becomes loose, the torque sensor 10 allows the magnetic flux acting on the stator 50 from the magnet 55 fixed to the stub shaft 87 to be appropriately controlled by the magnetic flux collecting yoke 43. The steering torque can be detected appropriately.

Here, if a large impact is applied to the steering device 80, the steering device 80 may be damaged. For example, when a large load acts on the wheels of a vehicle on which the steering device 80 is mounted, the load acting on the wheels is transmitted from the wheels to the rack bar 88b, and from the rack bar 88b to the first pinion gear 88a. The first pinion gear 88a tries to move in the axial direction due to the transmission of such a large load, but the relative movement of the first pinion gear 88a in the axial direction with respect to the housing 20 is restricted by the bearing 70. . Therefore, when the first pinion gear 88a attempts to move in the axial direction due to a large load, the large load acting on the first pinion gear 88a is transmitted to the bearing 70.

The load transmitted from the first pinion gear 88a to the bearing 70 is transmitted from the first pinion gear 88a to the inner ring 72 of the bearing 70, while the outer ring 71 of the bearing 70 is transferred by the cover screw 60 and the housing 20. Movement in the axial direction is restricted. Therefore, the inner ring 72 of the bearing 70 tends to move relative to the outer ring 71 of the bearing 70 in the axial direction due to the large load transmitted to the bearing 70 from the first pinion gear 88a. As a result, in the bearing 70, the inner ring 72 and the balls 73 may be axially misaligned, the outer ring 71 and the balls 73 may be axially misaligned, and the inner ring 72 and the outer ring 71 may be axially misaligned. That is, the bearing 70 may be damaged by the large load transmitted to the bearing 70 from the first pinion gear 88a, and the inner ring 72 and the outer ring 71 may become misaligned in the axial direction.

When the inner ring 72 of the bearing 70 moves along with the first pinion gear 88a with respect to the outer ring 71 in the axial direction toward the side where the cover screw 60 is located (the upper side in FIG. 10), the inner ring 72 of the bearing 70 moves toward the cover screw 60. comes into contact with. That is, the cover screw 60 that abuts the outer ring 71 of the bearing 70 to fix the bearing 70 to the housing 20 has an inner diameter of the inner peripheral surface 64 smaller than an outer diameter of the inner ring 72 of the bearing 70. Therefore, when the inner ring 72 of the bearing 70 moves toward the side where the cover screw 60 is located in the axial direction with respect to the outer ring 71, the inner ring 72 of the bearing 70 passes inside the inner peripheral surface 64 of the cover screw 60. The cover screw 60 cannot be moved and comes into contact with the cover screw 60.

As a result, relative movement of the inner ring 72 of the bearing 70 in the axial direction with respect to the outer ring 71 is restricted, so that the first pinion gear 88a to which the inner ring 72 of the bearing 70 is assembled also moves in the axial direction with respect to the housing 20 and the second housing 30. Relative movement is regulated. Therefore, even when a large load that moves the first pinion gear 88a in the axial direction acts on the steering device 80, the movement of the inner ring 72 of the bearing 70 is restricted, so that the first pinion gear The movement of 88a is also restricted, and it is possible to prevent major damage to the steering device 80 from occurring.

As described above, in the torque sensor 10 of the steering device 80 according to the present embodiment, the regulating member 33 is arranged on the opposite side of the cover screw 60 that fixes the bearing 70 to the side where the bearing 70 is arranged. As a result, even if the cover screw 60 is loosened, the amount of movement of the cover screw 60 can be restricted by the regulating member 33, and the stator 50 fixed to the first pinion gear 88a to which the bearing 70 is assembled. The magnitude of the axial movement amount can be limited to the magnitude of the axial gap Gap1 between the cover screw 60 and the regulating member 33. Furthermore, when the cover screw 60 and the bearing 70 are in contact with each other, the minimum value of the axial gap Gap2 between the flange portion 51 of the stator 50 and the magnetic flux collecting yoke 43 is the minimum value of the gap Gap2 in the axial direction between the cover screw 60 and the regulating member 33. It is larger than the axial gap Gap1. Therefore, even if the stator 50 moves relative to the magnetic flux collecting yoke 43 in the axial direction by the same amount as the gap Gap1 between the cover screw 60 and the regulating member 33 due to the loosening of the cover screw 60, the stator 50 A state in which there is an axial gap between the flange portion 51 and the magnetic flux collecting yoke 43 can be maintained. As a result, interference between the stator 50 and the magnetic flux collecting yoke 43 can be suppressed.

Further, since the regulating member 33 is formed in the second housing 30 fixed to the housing 20, a dedicated member is provided as the regulating member 33 that limits the amount of movement of the cover screw 60 when the cover screw 60 becomes loose. The regulating member 33 can be easily arranged without any trouble. As a result, the amount of movement of the cover screw 60 when the cover screw 60 loosens can be easily limited, and interference between the stator 50 and the magnetic flux collecting yoke 43 can be suppressed.

Further, the regulating member 33 formed in the second housing 30 is formed by a pilot protrusion 32 that positions the second housing 30 with respect to the housing 20 by entering the pilot recess 22 formed in the housing 20 . For this reason, the regulating member 33 that limits the amount of movement of the cover screw 60 can be arranged by fixing the second housing 30 to the housing 20, and can also be provided in an appropriate manner that can limit the amount of movement of the cover screw 60. It can be placed in any position. As a result, the amount of movement of the cover screw 60 when the cover screw 60 loosens can be easily limited, and interference between the stator 50 and the magnetic flux collecting yoke 43 can be suppressed.

Further, the magnetic flux collecting yoke 43 is housed in a magnetic flux collecting yoke housing 41 fixed to the second housing 30, the second housing 30 is attached to the housing 20 to which the bearing 70 is fixed, and the stator 50 is It is fixed to the first pinion gear 88a to be assembled. Therefore, by restricting the amount of movement of the cover screw 60 when the cover screw 60 is loosened by the regulating member 33, the amount of movement of the stator 50 can be restricted via the bearing 70 and the first pinion gear 88a. , the amount of movement of the stator 50 relative to the magnetic flux collecting yoke 43 can be limited. As a result, the distance between the flange portion 51 of the stator 50 and the magnetic flux collecting yoke 43 can be prevented from becoming too small, and interference between the stator 50 and the magnetic flux collecting yoke 43 can be suppressed.

In addition, since the magnetic flux collecting yoke housing 41 that stores the magnetic flux collecting yoke 43 is inserted into the sensor opening 35 formed in the second housing 30 and fixed to the second housing 30, the magnetic flux collecting yoke 43 is inserted into the second housing 30. 30, it can be easily arranged with high positional accuracy. Thereby, the axial gap Gap2 between the flange portion 51 of the stator 50 and the magnetic flux collecting yoke 43 can be made to an appropriate size, and the distance between the flange portion 51 of the stator 50 and the magnetic flux collecting yoke 43 becomes too small. can be suppressed. As a result, interference between the stator 50 and the magnetic flux collecting yoke 43 when the cover screw 60 loosens can be suppressed.

Furthermore, since the magnetic flux collecting yoke housing 41 is fixed to the second housing 30 with the magnetic flux collecting yoke 43 inserted between the respective flange portions 51 of the pair of stators 50, the magnetic flux collecting yoke 43 is fixed to the stator 50. It can be easily arranged at a position having an axial clearance with respect to the flange portion 51 of the flange portion 51 . Thereby, the axial gap Gap2 between the flange portion 51 of the stator 50 and the magnetic flux collecting yoke 43 can be made to an appropriate size, and the distance between the flange portion 51 of the stator 50 and the magnetic flux collecting yoke 43 becomes too small. can be suppressed. As a result, interference between the stator 50 and the magnetic flux collecting yoke 43 when the cover screw 60 becomes loose can be suppressed.

Further, since the housing 20 is formed with a cover screw storage recess 23 having a female thread 24 formed on the inner peripheral surface at a different position in the axial direction from the bearing storage recess 25, the cover screw 60 has a male thread 61 on the outer peripheral surface. By screwing into the female thread 24 of the cover screw storage recess 23, the bearing 70 stored in the bearing storage recess 25 can be easily fixed by being sandwiched between the cover screw 60 and the bearing storage recess 25. This makes it possible to restrict movement in the axial direction of the first pinion gear 88a to which the bearing 70 is assembled, and facilitates relative movement in the axial direction of the stator 50 fixed to the first pinion gear 88a with respect to the second housing 30. can be regulated. Therefore, the stator 50 fixed to the first pinion gear 88a is arranged with an axial gap between the magnetic flux collecting yoke 43 fixed to the second housing 30 and the flange portion 51 of the stator 50. , it is possible to maintain a state with a gap. As a result, interference between the stator 50 and the magnetic flux collecting yoke 43 can be suppressed.

Further, since the inner diameter of the cover screw 60 is smaller than the outer diameter of the inner ring 72 of the bearing 70, a large load in the direction of moving the first pinion gear 88a in the axial direction acts on the steering device 80, and the inner ring 72 of the bearing 70 Even if damage occurs to the bearing 70 that causes the outer ring 71 to move relative to the outer ring 71 in the axial direction, the inner ring 72 that has moved relative to the outer ring 71 can be brought into contact with the cover screw 60. As a result, relative movement of the inner ring 72 of the bearing 70 in the axial direction with respect to the outer ring 71 is restricted, so that the relative movement of the first pinion gear 88a to which the inner ring 72 is assembled with respect to the housing 20 and the second housing 30 is restricted. I can do it. As a result, damage that occurs to the steering device 80 when a large load is applied to the steering device 80 can be suppressed.

[Modified example]
In the embodiment described above, the regulating member 33 that regulates the movement of the cover screw 60 when the cover screw 60 is loosened is formed on the spigot convex portion 32 of the second housing 30, but the regulating member 33 is It may be formed of a material other than the spigot convex portion 32 of the second housing 30. The regulating member 33 has a gap Gap1 in the axial direction between the cover screw 60 and the regulating member 33 in a state where the cover screw 60 and the bearing 70 are in contact with each other. The form of the regulating member 33 does not matter as long as it is arranged so that it is smaller than the minimum value of the axial gap Gap2.

Although the preferred embodiments of the present disclosure have been described above, the present disclosure is not limited to those described in the above embodiments. The configurations described as embodiments and modified examples may be combined as appropriate.

10 Torque sensor (torque detection device)
20 Housing 21, 31 Plane portion 22 Pilot recess 23 Cover screw storage recess 24 Female thread 25 Bearing storage recess 30 Second housing 32 Pilot convex portion 33 Regulation member 35 Sensor opening 37, 42 Mounting bolt 40 Magnetic collector yoke assembly 41 Magnetic collector yoke Housing 43 Magnetic collecting yoke 43a First collecting yoke 43b Second collecting yoke 44 Hall IC
45 Connection terminal 50 Stator 51 Flange part 52 Teeth part 54 Carrier 55 Magnet 60 Cover screw 61 Male thread 62 Sensor side end part 63 Bearing side end part 64 Inner peripheral surface 70, 75 Bearing 71 Outer ring 72 Inner ring 73 Ball 74 Caulking member 80 Steering device 81 Steering wheel 82 Steering shaft 84, 86 Universal joint 85 Lower shaft 87 Stub shaft 87a Torsion bar 88 Steering gear 88a 1st pinion gear 88ag Gear 88ap Projection part 88b Rack bar 88bg Rack teeth 88c 2nd pinion gear 89 Tie rod 90 Rack housing 91 Pressing member 92 Spring 100 ECU
101 Vehicle speed sensor 102 Electric motor 103 Ignition switch 104 Power supply device

Claims (8)

housing and
a shaft disposed inside the housing;
a bearing that is assembled to the shaft so that it cannot move relative to the shaft in the axial direction of the shaft, and that is disposed inside the housing and rotatably supports the shaft;
a stator that includes a flange portion that protrudes outward in the radial direction of the shaft and is fixed to the shaft;
a magnetic flux collecting yoke that is arranged immovably with respect to the housing and overlaps the flange portion of the stator with a gap in the axial direction;
The shaft is formed in an annular shape through which the shaft passes, and is screwed into a female thread formed on the inner peripheral surface of a cover screw storage recess formed in the housing to connect the bearing to the housing. A cover screw that is fixed by being inserted in the direction,
a regulating member disposed on the opposite side of the cover screw from the side where the bearing is disposed in the axial direction, and regulating movement of the cover screw in a direction in which the cover screw moves away from the bearing;
Equipped with
The minimum value of the gap in the axial direction between the flange portion of the stator and the magnetic flux collecting yoke in a state where the cover screw and the bearing are in contact with each other is the minimum value of the gap in the axial direction between the cover screw and the regulating member. Torque detection device for steering gear that is larger than the direction gap. a second housing fixed to the housing at a position opposite to the side where the bearing is arranged with respect to the cover screw in the axial direction, and in which the magnetic flux collecting yoke is arranged;
The torque detection device for a steering device according to claim 1, wherein the regulating member is formed in the second housing. The housing has a spigot recess that is recessed to a predetermined depth in the axial direction on the inner circumferential surface of the end where the second housing is disposed,
The second housing is formed with a spigot convex portion that protrudes toward the side where the housing is located in the axial direction and is positioned in the radial direction with respect to the housing by entering the spigot recess, and
The second housing is formed with a flat portion that abuts against the housing in the axial direction to perform positioning with respect to the housing in the axial direction,
The torque detection device for a steering device according to claim 2, wherein the regulating member is formed by the spigot convex portion. The magnetic flux collecting yoke is housed in a magnetic flux collecting yoke housing,
The torque detection device for a steering system according to claim 2 or 3, wherein the magnetic flux collecting yoke housing is fixed to the second housing. A sensor opening opening in the radial direction is formed in the second housing,
The torque detection device for a steering system according to claim 4, wherein the magnetic flux collecting yoke housing is inserted into the sensor opening and fixed to the second housing. A pair of the stators are arranged,
The torque detection device for a steering system according to claim 4, wherein the magnetic flux collecting yoke housing is fixed to the second housing with the magnetic flux collecting yoke inserted between the flange portions of each of the pair of stators. . A bearing storage recess for storing the bearing is formed in the housing,
The cover screw storage recess is formed at a position different from the bearing storage recess in the axial direction and has a diameter larger than the diameter of the bearing storage recess,
The cover screw has a male thread formed on its outer peripheral surface,
The steering device according to claim 1, wherein the bearing is assembled to the housing by sandwiching an outer ring of the bearing between the cover screw and the bearing storage recess while the bearing is stored in the bearing storage recess. Torque detection device. The torque detection device for a steering system according to claim 7, wherein the inner diameter of the cover screw is smaller than the outer diameter of the inner ring of the bearing.

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