JP2023042620A - Torque sensor and manufacturing method thereof - Google Patents

Abstract

To hold down an increase in manufacturing costs and improve positioning precision.SOLUTION: In a torque sensor 1 having a column housing 10 in which a stator 30 is disposed inside and a magnetism collecting yoke assembly 40 having a magnetism collecting yoke 41 for detecting a change in magnetic flux of a stator 30, the magnetism collecting yoke assembly 40 has a body 50 for holding the magnetism collecting yoke 41 and a flange 51 projecting from the body 50, a screw component insertion hole 52 through which a screw component 70 passes and a positioning projection 55 projecting from the flange 51 around the screw component insertion hole 52 are formed in the flange 51, a column housing 10 has a sensor installation part 20 to which the magnetism collecting yoke assembly 40 is mounted, the positioning projection 55 is inserted into the sensor installation part 20, and a positioning recess 25 with which at least one portion of the positioning projection 55 comes into contact and multiple screw holes 27 that are formed in a bottom part 26 of the positioning recess 25 and with which a screw component 70 is threadedly engaged are formed.SELECTED DRAWING: Figure 14

Description

The present disclosure relates to torque sensors and methods of manufacturing torque sensors.

There are various methods of torque sensors for detecting torque applied to a rotating body. One example is a method that detects torque by detecting changes in magnetism. For example, the torque detection device described in Patent Document 1 passes through a plurality of permanent magnets, two magnetic rings arranged around the permanent magnets, and a magnetic circuit forming member composed of these permanent magnets and the magnetic rings. It has two magnetism collecting rings that collect magnetic flux and a magneto-sensitive element that detects the magnetism of the magnetic flux collected by the magnetism collecting rings. As a result, when a circumferential displacement occurs between the permanent magnet and the magnetic ring due to the torque acting on the rotating body that is the object of torque detection, the two magnetic collecting rings are separated by the displacement. A magneto-sensitive element detects the change in the magnetic flux generated between them, and detects the torque applied to the rotating body.

Japanese Patent Application Laid-Open No. 2007-212198

There are various types of torque sensor structures according to ease of manufacture and ease of maintenance. There is a type in which a part on which a magnetic collecting yoke is arranged is connected using a screw part. Assembling separately the part in which the stator is arranged and the part in which the magnetic collecting yoke is arranged, and connecting these parts using screw parts, compared to the case where they are all integrally formed, the manufacturing time is reduced. There are advantages in terms of ease of operation and ease of maintenance.

Here, when connecting multiple parts with threaded parts, the gap between the threaded part and the hole through which the threaded part passes causes variations in the relative positional relationship between both parts when assembled. can be considered. On the other hand, the relative positional relationship between the stator and the magnetism collection yoke is important when the magnetism collection yoke is used to accurately detect changes in magnetic flux. For this reason, when the part where the stator is arranged and the part where the magnetic collection yoke is arranged are connected using a threaded part, it is difficult to ensure the relative positional relationship between the stator and the magnetic collection yoke with high accuracy. , there is a possibility that it becomes difficult to accurately detect changes in the magnetic flux by the magnet collection yoke.

However, if the members on which the stator and the magnetic collecting yoke are arranged are processed with high accuracy over a wide range in order to increase the positioning accuracy of the stator and the magnetic collecting yoke, the manufacturing cost will increase. For these reasons, it has been very difficult to improve the positioning accuracy between the stator and the magnet collecting yoke without increasing the manufacturing cost.

The present disclosure has been made in view of the above, and it is an object of the present disclosure to provide a torque sensor and a torque sensor manufacturing method that can improve positioning accuracy while suppressing an increase in manufacturing cost.

A torque sensor according to the present disclosure includes a housing in which a stator is arranged, a cylindrical magnet arranged to face the stator, and a relative position change between the stator and the cylindrical magnet. A torque sensor comprising: a magnetism collection yoke assembly having a magnetism collection yoke for detecting a change in magnetic flux, the magnetism collection yoke assembly comprising: a body for exposing and holding the magnetism collection yoke; and a body projecting from the body. a flange having a plurality of threaded part insertion holes through which threaded parts used for attaching the magnetic collecting yoke assembly to the housing pass; A plurality of positioning protrusions projecting from a surface of the flange attached to the housing are formed, and the housing has a sensor installation portion to which the magnetism collecting yoke assembly is installed, and the sensor installation portion includes: a housing insertion hole into which the magnetic collecting yoke exposed from the body is inserted from the outside of the housing to the inside of the housing; a plurality of positioning recesses with which at least a part of the positioning projections contact; and a plurality of screw holes formed in the bottoms of the positioning recesses and into which the threaded parts passing through the threaded part insertion holes formed in the flange are screwed. is formed.

According to this configuration, the positioning recess is configured such that the positioning protrusion is inserted and at least a part of the positioning protrusion contacts when the positioning protrusion is inserted, and the threaded hole is the threaded part. Threaded parts passing through the insertion holes are screwed together. As a result, in the torque sensor in which the magnetism collecting yoke assembly is attached to the column housing by the threaded parts, the positioning projections 55 and the positioning protrusions 55 and the positioning protrusions 55 can be formed without performing high-precision machining in a wide range to improve the positioning accuracy between the stator and the magnetism collecting yoke. The positioning accuracy can be enhanced only by the concave portion. As a result, it is possible to improve the positioning accuracy while suppressing an increase in manufacturing cost.

As a desirable form, the positioning protrusion is lightly press-fitted into the positioning recess.

According to this configuration, since the positioning protrusion is lightly press-fitted into the positioning recess, it is possible to further improve the positioning accuracy when attaching the magnetic flux collecting yoke assembly to the column housing. As a result, it is possible to improve the positioning accuracy while suppressing an increase in manufacturing cost.

As a desirable form, the positioning protrusion has a protrusion extending in the insertion direction of the positioning protrusion into the positioning recess and protruding from the outer peripheral surface of the positioning protrusion.

According to this configuration, the positioning protrusion is formed with the protrusion extending in the direction in which the positioning protrusion is inserted into the positioning recess and protruding from the outer peripheral surface of the positioning protrusion. Therefore, the positioning protrusion is inserted into the positioning recess. At this time, the projection can be inserted while being in contact with the inner peripheral surface of the positioning recess. As a result, the positioning accuracy using the positioning protrusions and the positioning recesses can be further increased, and the positioning accuracy can be improved while suppressing an increase in manufacturing costs.

As a desirable form, the protrusion is formed to have an arcuate shape when viewed in the extending direction of the protrusion.

According to this configuration, since the protrusion is formed in an arcuate shape when viewed in the extending direction of the protrusion, the positioning accuracy using the positioning protrusion and the positioning recess is enhanced by the protrusion. In addition, when inserting the positioning convex portion into the positioning concave portion, the insertion can be performed smoothly. As a result, the magnetic collecting yoke assembly can be easily attached to the column housing, and the positioning accuracy can be improved while suppressing an increase in manufacturing cost.

As a desirable form, the protrusion is formed in a rectangular shape when viewed in the extending direction of the protrusion.

According to this configuration, the insertion of the positioning protrusion into the positioning recess may be light press-fitting, depending on the relative sizes of the outer diameter of the positioning protrusion and the inner diameter of the positioning recess, the materials of the positioning protrusion and the column housing, and the like. It is possible to form the protrusions in different shapes.

As a desirable form, the protrusion is formed in a shape having an edge portion when viewed in the extending direction of the protrusion.

According to this configuration, the insertion of the positioning protrusion into the positioning recess may be light press-fitting, depending on the relative sizes of the outer diameter of the positioning protrusion and the inner diameter of the positioning recess, the materials of the positioning protrusion and the column housing, and the like. It is possible to form the protrusions in different shapes.

As a desirable form, the protrusions are arranged in different numbers among the positioning protrusions.

According to this configuration, by making the number of protrusions different between the positioning protrusions, the positioning protrusion having the larger number of protrusions can be inserted into the positioning recess with high positional accuracy while the protrusion is The positioning convex portion with the smaller weight can be inserted with a certain degree of relative displacement when it is inserted into the positioning concave portion. As a result, even if a slight dimensional error occurs when forming the positioning protrusions and the positioning recesses, the dimensional error is absorbed while securing the positioning accuracy when attaching the magnetic collecting yoke assembly to the column housing. be able to.

Preferably, the flange is provided with a substantially cylindrical metal bush, and the threaded part insertion hole is formed by an inner peripheral surface of the metal bush.

According to this configuration, the metal bush is arranged on the flange, and the threaded part insertion hole is formed by the inner peripheral surface of the metal bushing. It is possible to ensure strength when attaching the magnet collecting yoke assembly to the column housing. As a result, it is possible to improve the positioning accuracy while suppressing an increase in manufacturing cost.

Preferably, the outer peripheral surface of the metal bush is formed with an uneven portion having repeated unevenness.

According to this configuration, since the uneven portion in which the unevenness is repeated is formed on the outer peripheral surface of the metal bush, it is possible to increase the degree of adhesion between the flange and the metal bush, thereby suppressing the metal bush from coming off the flange. be able to. As a result, it is possible to improve the positioning accuracy while suppressing an increase in manufacturing cost.

As a desirable form, the said metal bush has a slit inclined with respect to an axial center direction.

According to this configuration, the metal bush is provided with a slit that is inclined with respect to the axial direction, and the edge of the slit is caught by the flange. A resistive force can be generated in the slit. As a result, it is possible to prevent the metal bush from slipping out of the flange, thereby suppressing an increase in manufacturing cost and improving the positioning accuracy.

A method of manufacturing a torque sensor according to the present disclosure includes a housing in which a stator is arranged, a cylindrical magnet arranged to face the stator, and relative positional changes between the stator and the cylindrical magnet. a magnet collection yoke assembly for detecting a change in magnetic flux in response to a magnetic flux collection yoke, wherein the magnet collection yoke assembly includes a body that exposes and holds the magnet collection yoke and a flange protruding from the body, the flange having a plurality of threaded part insertion holes through which threaded parts used for mounting the magnetism collecting yoke assembly to the housing pass, and the threaded part insertion holes. a plurality of positioning projections are formed on the periphery and protrude from a surface of the flange attached to the housing; the housing has a sensor installation portion to which the magnetic collecting yoke assembly is attached; The sensor installation portion includes a housing insertion hole through which the magnetic collecting yoke exposed from the body is inserted from the outside of the housing to the inside of the housing, and the positioning projection formed recessed from the sensor installation portion. a plurality of positioning recesses into which at least part of the positioning projections are in contact; and a plurality of positioning recesses formed in the bottoms of the positioning recesses. In a torque sensor in which a plurality of threaded holes are formed to match with each other, at the same time the positioning recesses are processed, pilot holes for the threaded holes are processed.

According to this configuration, since the positioning recesses are machined in the sensor installation portion of the column housing and the pilot holes for the screw holes are machined at the same time, the number of work steps for forming the positioning recesses and the screw holes can be reduced. can. As a result, it is possible to improve the positioning accuracy while suppressing an increase in manufacturing cost.

The torque sensor and the method for manufacturing the torque sensor according to the present disclosure have the effect of improving the positioning accuracy while suppressing an increase in manufacturing cost.

FIG. 1 is a schematic diagram of a steering device according to an embodiment. FIG. 2 is a perspective view of the steering device according to the embodiment. 3 is a perspective view of the torque sensor shown in FIG. 1. FIG. 4 is a side view of the torque sensor shown in FIG. 3. FIG. FIG. 5 is a cross-sectional view taken along line AA of FIG. FIG. 6 is a schematic diagram illustrating an outline of a magnet, a stator, and a magnetic collecting yoke that are arranged in the column housing. FIG. 7 is a cross-sectional view of the main part at the position of the B part in FIG. 8 is a plan view of the magnetic collecting yoke assembly shown in FIG. 3. FIG. 9 is a cross-sectional view of the main part showing the internal structure of the body in the magnetic collecting yoke assembly shown in FIG. 8. FIG. FIG. 10 is a CC arrow view of FIG. 11 is a cross-sectional view taken along line DD of FIG. 10. FIG. 12 is a detailed view of a sensor installation portion formed in the column housing shown in FIG. 3. FIG. 13 is a cross-sectional view at a position passing through two screw holes in the sensor installation portion shown in FIG. 12. FIG. FIG. 14 is an explanatory diagram showing a state where the magnetic collecting yoke assembly is attached to the column housing. 15 is a cross-sectional view taken along the line EE of FIG. 14. FIG. FIG. 16 is a modification of the torque sensor according to the embodiment, and is an explanatory diagram of a case where a slit is formed in the metal bush. FIG. 17 is a modification of the torque sensor according to the embodiment, and is an explanatory diagram of a case where the protrusion is formed in a rectangular shape. FIG. 18 is a modification of the torque sensor according to the embodiment, and is an explanatory diagram of a case where the protrusion has an edge. FIG. 19 is a modified example of the torque sensor according to the embodiment, and is an explanatory diagram in which the number of projections differs between the positioning projections.

Hereinafter, the present invention will be described in detail with reference to the drawings. It should be noted that the present invention is not limited by the following modes for carrying out the invention (hereinafter referred to as embodiments). In addition, components in the following embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those that fall within a so-called equivalent range. Furthermore, the constituent elements disclosed in the following embodiments can be combined as appropriate.

[Embodiment]
FIG. 1 is a schematic diagram of a steering device 80 according to an embodiment. FIG. 2 is a perspective view of the steering device 80 according to the embodiment. As shown in FIG. 1, the steering device 80 includes a steering wheel 81, a steering shaft 82, a steering force assist mechanism 83, a universal joint 84, an intermediate shaft 85, and a steering wheel 81 in the order in which the force applied by the operator is transmitted. It is joined to the pinion shaft 87 including the universal joint 86 . As shown in FIG. 2, the steering force assist mechanism 83 is provided in the vicinity of the steering wheel 81 and arranged inside the vehicle compartment separated from the outside.

The steering shaft 82 includes an input shaft 82a, an output shaft 82b, and a torsion bar (not shown). The input shaft 82a has one end connected to the steering wheel 81 and the other end connected to the torsion bar. The torsion bar is fitted in a hole provided in the center of the input shaft 82a and fixed to the input shaft 82a via a pin. The output shaft 82b has one end connected to the torsion bar and the other end connected to the universal joint 84 . The torsion bar is fixed to the output shaft 82b by being press-fitted into a hole provided in the center of the output shaft 82b. Rotational torque is transmitted between the input shaft 82a and the output shaft 82b via a torsion bar connected to both.

As shown in FIG. 1, intermediate shaft 85 connects universal joint 84 and universal joint 86 . One end of intermediate shaft 85 is connected to universal joint 84 and the other end is connected to universal joint 86 . One end of pinion shaft 87 is connected to universal joint 86 , and the other end of pinion shaft 87 is connected to steering gear 88 . Universal joint 84 and universal joint 86 are cardan joints, for example. Rotation of the steering shaft 82 is transmitted to the pinion shaft 87 via the intermediate shaft 85 . That is, the intermediate shaft 85 rotates along with the steering shaft 82 .

As shown in FIG. 1, the steering gear 88 includes a pinion 88a and a rack 88b. The pinion 88 a is connected to the pinion shaft 87 . The rack 88b meshes with the pinion 88a. The steering gear 88 converts the rotary motion transmitted to the pinion 88a into linear motion by the rack 88b. Rack 88 b is connected to tie rod 89 . The angle of the wheel changes as the rack 88b moves.

As shown in FIG. 1 , the steering force assist mechanism 83 includes a reduction gear 92 and an electric motor 93 . The reduction gear 92 is, for example, a worm reduction gear. The reduction gear 92 increases the torque generated by the electric motor 93 and transmits it to the output shaft 82b. As a result, the reduction gear 92 applies an auxiliary steering torque to the output shaft 82b. The steering device 80 is a column assist type electric power steering device. The column-assist type electric power steering device refers to a power steering device in which assist torque generated by an electric motor 93 is applied to a steering shaft 82 connected to a steering wheel 81 .

As shown in FIG. 1 , the steering device 80 includes an ECU (Electronic Control Unit) 90 , a torque sensor 1 and a vehicle speed sensor 95 . The electric motor 93 , torque sensor 1 and vehicle speed sensor 95 are electrically connected to the ECU 90 . The torque sensor 1 outputs the steering torque transmitted to the input shaft 82a to the ECU 90 through CAN (Controller Area Network) communication. The vehicle speed sensor 95 detects the traveling speed (vehicle speed) of the vehicle body on which the steering device 80 is mounted. A vehicle speed sensor 95 is provided on the vehicle body and outputs the vehicle speed to the ECU 90 through CAN communication.

The ECU 90 controls operation of the electric motor 93 . The ECU 90 acquires signals from the torque sensor 1 and the vehicle speed sensor 95 respectively. Electric power is supplied to the ECU 90 from a power supply device 99 (for example, a vehicle-mounted battery) while an ignition switch 98 is on. The ECU 90 calculates an assist steering command value based on the steering torque and vehicle speed. The ECU 90 adjusts the power value supplied to the electric motor 93 based on the assist steering command value. The ECU 90 acquires information on the induced voltage of the electric motor 93 or information output from a resolver or the like provided on the electric motor 93 . Controlling the electric motor 93 by the ECU 90 reduces the force required to operate the steering wheel 81 .

FIG. 3 is a perspective view of the torque sensor 1 shown in FIG. 1. FIG. 4 is a side view of the torque sensor 1 shown in FIG. 3. FIG. FIG. 5 is a cross-sectional view taken along line AA of FIG. The torque sensor 1 has a column housing 10 which is a housing for the torque sensor 1 and a magnetism collecting yoke assembly 40 . The column housing 10 includes a housing portion 11 that is formed in a substantially cylindrical shape and serves as a housing of the column housing 10, and a flange portion that is formed around the housing portion 11 in a flange shape. and a shaped portion 15 . Further, the column housing 10 has a sensor installation portion 20 formed on the side surface of the housing portion 11 , and the magnetism collection yoke assembly 40 is attached to the sensor installation portion 20 with a threaded part 70 so as to attach to the column housing 10 . installed.

A space is formed inside the housing portion 11 of the column housing 10, and both ends in the axial direction of the cylindrical shape of the housing portion 11 are openings that communicate the outside and the inside of the housing portion 11. It's been 12. In the torque sensor 1, the input shaft 82a of the steering shaft 82 is inserted into the housing portion 11 from one opening 12 of the housing portion 11 of the column housing 10, and the output shaft 82b of the steering shaft 82 is inserted into the housing. It enters into the housing part 11 from the other opening part 12 of the part 11 . At least a portion of the torsion bar connected to the input shaft 82 a and the output shaft 82 b is located inside the housing portion 11 of the column housing 10 .

Further, a magnet 35 and a stator 30 are arranged in the housing portion 11 of the column housing 10 to detect torque based on changes in magnetism.

FIG. 6 is a schematic diagram for explaining the outline of the magnet 35, the stator 30, and the magnetic collecting yoke 41 arranged in the column housing 10. As shown in FIG. One of the magnet 35 and the stator 30 arranged in the housing portion 11 of the column housing 10 is attached to the input shaft 82a, and the other is attached to the output shaft 82b. In this embodiment, the magnet 35 is attached to the input shaft 82a within the housing portion 11 of the column housing 10, and the stator 30 is attached to the output shaft 82b within the housing portion 11 of the column housing 10. . Among them, the magnet 35 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 30 has a ring portion 31 and teeth portions 32 . The ring portion 31 is formed in an annular plate-like shape with the thickness direction being the axial direction. The tooth portion 32 extends from the inner peripheral portion of the annular ring portion 31 toward the axial direction of the ring portion 31 and has a plate-like shape such that the thickness direction of the plate is the radial direction of the ring portion 31 . formed. A plurality of tooth portions 32 are arranged side by side in the circumferential direction of the ring portion 31 at intervals.

The stator 30 formed in this manner has a ring portion 31 and a tooth portion 32, respectively, and has a first stator 30a and a second stator 30b formed in the same shape. That is, the first stator 30a has an annular first ring portion 31a and a plurality of first tooth portions 32a, and the second stator 30b has an annular second ring portion 31b and a plurality of second tooth portions 32a. It has the tooth part 32b. The first stator 30a and the second stator 30b are mounted on the same shaft with both ring portions 31 positioned coaxially and facing away from the other stator 30. , in this embodiment, are attached to the output shaft 82b.

That is, the first stator 30a is arranged such that the first teeth 32a extend from the first ring portion 31a toward the second stator 30b, and the second stator 30b is arranged so that the second teeth 32b extend toward the second stator 30b. It is arranged so as to extend from the ring portion 31b toward the first stator 30a. At that time, since a plurality of the first tooth portions 32a and the second tooth portions 32b are provided on the first ring portion 31a and the second ring portion 31b with an interval between them, the first stator 30a and the second stator 30b is combined so that the tooth portion 32 of the stator 30 of itself is positioned at a portion where the tooth portion 32 of the other stator 30 is not positioned in the circumferential direction.

The magnet 35 attached to the input shaft 82a is arranged inside the first stator 30a and the second stator 30b thus combined. The magnet 35 and the stator 30 are arranged in the housing portion 11 so that the axial direction thereof coincides with the axial direction of the housing portion 11 of the column housing 10 . For these reasons, the magnet 35 and the stator 30 are arranged in the column housing 10 in a positional relationship in which the outer peripheral surface of the magnet 35 faces the tooth portion 32 of the stator 30 . By arranging the magnet 35 and the stator 30 in such a positional relationship, torque is transmitted between the input shaft 82a and the output shaft 82b via the torsion bar, and the input shaft 82a and the output shaft 82b move relative to each other. When the magnet 35 rotates slightly, the magnetic flux acting on the stator 30 from the magnet 35 changes as the relative positional relationship between the magnet 35 and the stator 30 changes.

A magnetism collection yoke 41 of a magnetism collection yoke assembly 40 is arranged near the stator 30 . The magnetic collecting yoke 41 is a member for detecting changes in the magnetic flux acting on the stator 30 from the magnet 35 and is arranged near the ring portion 31 of the stator 30 . Since the stator 30 is provided with a first stator 30a and a second stator 30b, the magnetic collecting yoke 41 is also provided with a first magnetic collecting yoke 41a and a second magnetic collecting yoke 41b correspondingly. ing. That is, the first magnetic collecting yoke 41a is arranged near the first ring portion 31a of the first stator 30a, and the second magnetic collecting yoke 41 is arranged near the second ring portion 31b of the second stator 30b. A magnetic collecting yoke 41b is arranged.

The magnetic collecting yoke 41 is positioned between the two ring portions 31 of the stator 30 . That is, the first magnetic collection yoke 41a is arranged near the surface of the first ring portion 31a of the first magnetic collection yoke 41a on which the second ring portion 31b is located. It is arranged in the vicinity of the surface of the second ring portion 31b of the magnetic collecting yoke 41b on which the first ring portion 31a is located. By locating the magnetic collecting yoke 41 in the vicinity of the ring portion 31 in this way, the magnetic collecting yoke 41 can move from the magnet 35 to the stator when the input shaft 82a and the output shaft 82b relatively slightly rotate. The magnetic flux acting on 30 allows the change to be detected.

Furthermore, a Hall IC 42 is arranged between the two magnetic collecting yokes 41 . The Hall IC 42 is arranged between the magnetic collecting yokes 41 at a position away from the portion of the magnetic collecting yoke 41 located near the ring portion 31 of the stator 30 . The Hall IC 42 is capable of detecting changes in magnetic flux density acting on the two magnetic collecting yokes 41, converting the detected changes in magnetic flux density into electrical signals, and outputting the electrical signals. Note that a magnetic sensor to which a magnetoresistive effect or a tunnel magnetoresistive effect is applied can be used instead of the Hall IC. In short, it suffices if the change in the magnetic flux density occurring between the magnetic collecting yokes 41 can be output as an electric signal.

FIG. 7 is a cross-sectional view of the main part at the position of the B part in FIG. The stator 30 arranged within the housing portion 11 of the column housing 10 is held by a carrier 38 within the housing portion 11 . The carrier 38 has an inner diameter slightly larger than the inner diameter of the stator 30 or the outer diameter at the teeth portion 32 (see FIG. 6) of the stator 30 , and an outer diameter larger than the outer diameter of the ring portion 31 of the stator 30 . It is formed in a small, generally cylindrical shape.

Further, the carrier 38 has a length approximately equal to the height of the teeth 32 of the stator 30 . That is, the length of the carrier 38 is approximately the same as the distance between the first ring portion 31a and the second ring portion 31b when the first stator 30a and the second stator 30b are combined. .

The first stator 30a and the second stator 30b are oriented so that their axial directions are the same as the axial direction of the carrier 38, and extend inside the carrier 38 from different end sides in the longitudinal direction of the carrier 38. The first tooth portion 32a and the second tooth portion 32b are inserted. As a result, the first stator 30a and the second stator 30b are held by the carrier 38 in a state in which the first teeth 32a and the second teeth 32b are inside the carrier 38 .

The first stator 30a and the second stator 30b held by the carrier 38 are arranged such that the first ring portion 31a and the second ring portion 31b are positioned outside the carrier 38 from mutually different ends in the longitudinal direction of the carrier 38. It is held in a state where

The magnetism collection yoke assembly 40 attached to the column housing 10 is attached to the column housing 10 in such a direction that the magnetism collection yoke 41 is disposed inside the housing portion 11 of the column housing 10 . That is, the magnetism collection yoke assembly 40 includes two magnetism collection yokes 41, a first magnetism collection yoke 41a and a second magnetism collection yoke 41b. When the yokes 41 are positioned inside the housing portion 11 , the two magnetic collecting yokes 41 are arranged between the ring portions 31 positioned on both sides of the carrier 38 in the longitudinal direction.

The two ring portions 31 and the two magnetism collection yokes 41 arranged as described above form a set of the first ring portion 31a and the first magnetism collection yoke 41a which are arranged at close positions. Similarly, the second ring portion 31b and the second magnetic collection yoke 41b, which are arranged at close positions, form one set. That is, two sets of the ring portion 31 and the magnetic collecting yoke 41 are arranged in pairs. The paired ring portion 31 and the magnetism collection yoke 41 have a relatively small clearance g in the axial direction of the housing portion 11, and the clearance g between the ring portion 31 and the magnetism collection yoke 41 is two pairs. The ring portion 31 and the magnetic collecting yoke 41 have substantially the same size.

FIG. 8 is a plan view of the magnetic collecting yoke assembly 40 shown in FIG. The magnetism collection yoke assembly 40 has a body 50 , a flange 51 protruding from the body 50 , and a magnetism collection yoke 41 attached to the body 50 . The body 50 is formed in a box-like shape, has a space inside, and holds the magnetic collecting yoke 41 while exposing it. In addition, the body 50 has a cylindrical curved shape having the shape of the housing portion 11 of the column housing 10 at the end located closer to the column housing 10 when the magnetic collecting yoke assembly 40 is attached to the column housing 10 . curved in the same direction.

More specifically, the body 50 has a thickness when the direction in the axial direction of the cylinder, which is the shape of the housing portion 11, is the thickness direction of the body 50 when the magnetic collecting yoke assembly 40 is attached to the column housing 10. The magnitude of the direction is getting smaller. In addition, when the body 50 has the length direction of the body 50 that is the direction in which the magnetic collecting yoke assembly 40 is attached to the column housing 10 and the width direction of the body 50 that is orthogonal to the thickness direction and the length direction, The length and width directions of the body 50 are formed to a predetermined size that is larger than the size in the thickness direction.

The magnetism collection yoke 41 is arranged at the end of the body 50 that is positioned closer to the column housing 10 when the magnetism collection yoke assembly 40 is attached to the column housing 10 , i.e., the curved side portion of the body 50 . It is The magnetism collection yoke 41 is formed in a plate-like shape such that the thickness direction of the body 50 is also the thickness direction of the magnetism collection yoke 41 . In addition, two magnetic collecting yokes 41 are spaced apart in the thickness direction of the body 50 (see FIG. 7). Both of the two magnetic collecting yokes 41 are formed in a curved shape that is substantially concentric with the curved portion of the body 50 when viewed in the thickness direction.

The flanges 51 that protrude from the body 50 are arranged on both sides of the body 50 in the width direction, and protrude from the body 50 respectively. The flanges 51 arranged on both sides of the body 50 are formed in a plate-like shape such that the length direction of the body 50 is the thickness direction of the flanges 51 .

In the magnetism collection yoke assembly 40, a portion of the torque sensor 1 which is electrically connected to the ECU 90 is attached to a portion of the body 50 opposite to the side where the magnetism collection yoke 41 is arranged in the longitudinal direction. A connection terminal 43 is arranged.

FIG. 9 is a cross-sectional view showing the internal structure of the body 50 in the magnetic collecting yoke assembly 40 shown in FIG. The Hall IC 42 is arranged inside the body 50 of the magnetic collecting yoke assembly 40 . The Hall IC 42 is arranged inside the body 50 between the two magnetic collection yokes 41 while being separated from the two magnetic collection yokes 41 . The two magnetism collecting yokes 41 held by the body 50 are arranged so as to be exposed from inside the body 50 in the longitudinal direction of the body 50 while being close to the Hall IC 42 within the body 50 . Also, the Hall IC 42 is connected to the connection terminal 43 inside the body 50 .

The Hall IC 42 detects a change in magnetic flux density acting on the two magnetic collecting yokes 41 and outputs the detected change in magnetic flux density from the connection terminal 43 as an electric signal. As a result, the magnetism collection yoke assembly 40 can convert the change in the magnetic flux density acting on the two magnetism collection yokes 41 into an electrical signal using the Hall IC 42 and output the electrical signal from the connection terminal 43 to the ECU 90 . there is

FIG. 10 is a CC arrow view of FIG. 11 is a cross-sectional view taken along line DD of FIG. 10. FIG. Threaded part insertion holes 52 and positioning protrusions 55 are formed in flanges 51 formed so as to protrude from the body 50 on both sides in the width direction of the body 50 . Since the threaded part insertion hole 52 and the positioning protrusion 55 are formed in each of the flanges 51 formed on both sides of the body 50 , the threaded part insertion hole 52 and the positioning protrusion 55 are formed in the magnetic collecting yoke assembly 40 . are formed in multiple In the present embodiment, one threaded component insertion hole 52 and one positioning protrusion 55 are formed in each of the flanges 51 on both sides of the body 50, so that the threaded component insertion hole 52 and the positioning protrusion 55 are Two of them are formed in one magnetic collecting yoke assembly 40 .

The threaded part insertion hole 52 is a hole that penetrates the flange 51 in the thickness direction of the flange 51, and serves as a hole through which the threaded part 70 (see FIG. 3) used to attach the magnetic collecting yoke assembly 40 to the column housing 10 passes. formed.

The positioning protrusion 55 is located around the threaded part insertion hole 52 and protrudes from the surface of the flange 51 attached to the column housing 10 . More specifically, the positioning projection 55 is formed integrally with the flange 51, and the surface of the flange 51 on the side attached to the column housing 10, that is, the surface on the side where the magnetic collecting yoke 41 is positioned in the thickness direction of the flange 51. , is formed to protrude in the thickness direction of the flange 51 . In this embodiment, the positioning protrusion 55 is formed integrally with the flange 51 from a resin material, for example, and the flange 51 is formed integrally with the body 50 . The positioning projection 55 is formed to protrude in a substantially cylindrical shape whose axis coincides with the axis of the threaded component insertion hole 52 .

A metal bush 60 made of a metal material and having a substantially cylindrical shape is arranged on the flange 51 . The metal bushings 60 are arranged on both flanges 51 formed on both sides of the body 50 . The metal bush 60 has a cylindrical one end formed with a flange 61 projecting outward in the radial direction of the cylinder in an annular shape. The length of the metal bush 60 is slightly longer than the length from the surface of the flange 51 opposite to the side where the positioning projections 55 are located to the tip of the positioning projections 55 . The metal bushing 60 formed in this way is arranged at a position where the threaded part insertion hole 52 is formed in the flange 51 .

Specifically, the side of the metal bush 60 on which the collar portion 61 is located is located on the opposite side of the flange 51 to the side on which the positioning convex portion 55 is located, and the axial direction of the cylindrical shape is the thickness direction of the flange 51. It is embedded in the flange 51 at a position where the threaded part insertion hole 52 is formed. Therefore, the threaded part insertion hole 52 formed in the flange 51 is formed by the inner peripheral surface 62 of the metal bush 60 formed in a substantially cylindrical shape.

In this manner, the outer peripheral surface 63 of the metal bush 60 embedded in the flange 51 is formed with an uneven portion 64 having repeated unevenness. The concave-convex portion 64 is formed, for example, by so-called knurling, in which relatively fine concave-convex portions are formed in a mesh shape. The concave-convex portion 64 is formed in a predetermined range in the length direction of the metal bushing 60 over one circumference of the outer peripheral surface 63 of the metal bushing 60 .

A projection 57 projecting from the outer peripheral surface 56 is formed on the positioning projection 55 . The projecting portion 57 is formed to extend in a direction along the axial direction of the cylinder that is the shape of the positioning projection 55, and extends from the end of the positioning projection 55 on the flange 51 side to the side where the flange 51 is located. is formed across the opposite end of the .

Further, the protrusion 57 is formed in an arcuate shape when viewed in the extending direction of the protrusion 57 . That is, the protrusion 57 has a substantially semicircular shape that protrudes outward in the radial direction of the positioning protrusion 55 when viewed in the axial direction of the positioning protrusion 55 . formed.

A plurality of protrusions 57 formed in this way are arranged on one positioning protrusion 55 . The plurality of protrusions 57 arranged on the positioning protrusion 55 are arranged at equal intervals in the circumferential direction of the cylinder that is the shape of the positioning protrusion 55 . In this embodiment, three protrusions 57 are arranged at regular intervals on one positioning protrusion 55 .

FIG. 12 is a detailed view of the sensor installation portion 20 formed in the column housing 10 shown in FIG. 13 is a cross-sectional view of the sensor installation portion 20 shown in FIG. 12 at a position passing through two screw holes 27. FIG. A housing insertion hole 22 , a positioning recess 25 , and a screw hole 27 are formed in the sensor installation portion 20 formed in the column housing 10 . The sensor installation portion 20 is formed of a plane parallel to the axial direction of the housing portion 11 of the column housing 10 .

The housing insertion hole 22 is a hole that opens to the sensor installation portion 20 and communicates the outside and the inside of the housing portion 11 of the column housing 10 . As described above, the housing insertion hole 22 formed in the sensor installation portion 20 allows the magnetic collection yoke 41 exposed from the body 50 to be inserted into the column housing 10 when the magnetic collection yoke assembly 40 is attached to the sensor installation portion 20 . It is a portion that is inserted into the inside of the column housing 10 from the outside of the column housing 10 .

Further, when attaching the magnetism collection yoke assembly 40 to the sensor installation portion 20 , the portion of the body 50 near the magnetism collection yoke 41 is also inserted into the housing insertion hole 22 together with the magnetism collection yoke 41 . Therefore, the housing insertion hole 22 is formed in a substantially rectangular shape in which the axial direction of the housing portion 11 of the column housing 10 is the direction of the short side. In other words, the housing insertion hole 22 has a long side length slightly longer than the length in the width direction of the body 50 of the magnetism collecting yoke assembly 40 and a short side length slightly longer than that of the body 50 of the magnetism collecting yoke assembly 40 . It is a substantially rectangular hole slightly longer than the length in the thickness direction. This allows the body 50 of the magnetism collection yoke assembly 40 to be inserted into the housing insertion hole 22 when attaching the magnetism collection yoke assembly 40 to the sensor installation portion 20 .

The housing insertion hole 22 is formed in a size with a margin for the body 50 so that the body 50 can be easily inserted. Therefore, it is preferable to use a dust guard or the like around the housing insertion hole 22 to prevent dust from entering the column housing 10 through the housing insertion hole 22 .

The positioning recesses 25 are recessed from the sensor installation portion 20 at positions on both sides of the housing insertion hole 22 in the longitudinal direction of the housing insertion hole 22, and the magnetism collection yoke assembly 40 is attached to the sensor installation portion 20. In this case, the positioning protrusion 55 of the magnetism collection yoke assembly 40 is inserted. The two positioning recesses 25 arranged on both sides of the housing insertion hole 22 are formed at intervals corresponding to the two positioning protrusions 55 provided on the flange 51 of the magnetic collecting yoke assembly 40 .

Specifically, the positioning concave portion 25 is formed as a bottomed hole having a substantially cylindrical shape with the direction normal to the plane of the sensor installation portion 20 being the axial direction. The cylindrical shape of the positioning recess 25 has a diameter approximately equal to the outer diameter of the positioning projection 55 of the magnetic flux collection yoke assembly 40, and a depth extending from the flange 51 side end of the positioning projection 55 to the flange. It is as deep as the length to the end on the opposite side of 51 . As described above, the positioning recess 25 is formed to have approximately the same size as the positioning protrusion 55 , so that when the positioning protrusion 55 is inserted into the positioning recess 25 , at least a part of the positioning protrusion 55 is displaced. is sized to contact the inner peripheral surface of the positioning recess 25 .

The screw holes 27 are formed in bottoms 26 of a plurality of positioning recesses 25 formed in the sensor installation portion 20, respectively. The threaded hole 27 is screwed into the threaded part 70 passing through the threaded part insertion hole 52 formed in the flange 51 of the magnetism collection yoke assembly 40 when the magnetism collection yoke assembly 40 is attached to the sensor installation portion 20 by the threaded part 70 . The screw hole 27 is sized to fit. The screw hole 27 is formed at a position where the axis substantially coincides with the extension of the cylindrical axis of the positioning recess 25 .

Here, the machining of the positioning recesses 25 and the screw holes 27 formed in the column housing 10 as described above will be described. The screw hole 27 is formed in the bottom portion 26 of the positioning recess 25 and is formed at a position where the axis thereof coincides with the axis of the positioning recess 25 . Therefore, when processing the column housing 10 to form the positioning recesses 25 and the screw holes 27, tools such as drills with different diameters for drilling the holes are coaxially formed. Machining is preferably carried out using a tool.

In other words, the machining of the positioning recess 25 and the threaded hole 27 is performed by combining a tool of a size suitable for machining the positioning recess 25 with a tool of a size capable of processing the pilot hole of the threaded hole 27. It is preferable to use one formed by By using such a tool to process the position of the sensor installation portion 20 of the column housing 10, the positioning recess 25 is processed by the portion of the tool for processing the positioning recess 25, and at the same time, the lower A pilot hole for the screw hole 27 is machined with a portion for machining the hole. After that, the pilot hole of the screw hole 27 is tapped to form the screw hole 27, and the portion of the positioning recess 25 is finished using an end mill, a reamer, or the like, if necessary. .

Next, the attachment of the magnet collecting yoke assembly 40 to the column housing 10 will be described. FIG. 14 is an explanatory view showing a state where the magnetic collecting yoke assembly 40 is attached to the column housing 10. As shown in FIG. When attaching the magnetism collection yoke assembly 40 to the sensor installation portion 20 of the column housing 10, it is inserted into the housing insertion hole 22 of the sensor installation portion 20 from the side where the magnetism collection yoke 41 exposed from the body 50 is located. The body 50 of the magnetic flux collection yoke assembly 40 is inserted into the housing insertion hole 22 in the correct orientation.

By inserting the body 50 into the housing insertion hole 22, when the positioning protrusions 55 provided on the flanges 51 arranged on both sides of the body 50 reach the positions of the positioning recesses 25 formed in the sensor installation section 20, The positioning protrusion 55 is inserted into the positioning recess 25 . That is, the positioning projections 55 provided on the flange 51 extend in the direction of insertion of the positioning projections 55 into the positioning recesses 25, and the two positioning projections 55 arranged on both sides of the body 50 are located on the sensor installation portion. Since the two positioning recesses 25 formed on both sides of the 20 have the same spacing, both of the two positioning protrusions 55 are inserted into the two positioning recesses 25 .

At this time, the positioning convex portion 55 and the positioning concave portion 25 have approximately the same diameter, and the positioning convex portion 55 is formed of a resin material, so it has a certain degree of elasticity. Therefore, when inserting the positioning protrusion 55 into the positioning recess 25 , the positioning protrusion 55 is lightly press-fitted into the positioning recess 25 . That is, at least part of the outer peripheral surface of the positioning protrusion 55 contacts the inner peripheral surface of the positioning recess 25 , and the positioning protrusion 55 is inserted in a state of being slightly compressed by the pressure from the positioning recess 25 .

In addition, since the positioning projection 55 has the projection 57 projecting from the outer peripheral surface 56 , the projection 57 easily contacts the positioning recess 25 . It is easily deformed. As a result, when the positioning protrusion 55 is inserted into the positioning recess 25, the protrusion 57 contacts the inner peripheral surface of the positioning recess 25 and is elastically deformed. The contact pressure against the positioning recess 25 increases due to the elastic deformation of 57 . Therefore, the positioning protrusion 55 is lightly press-fitted into the positioning recess 25 also by this action.

15 is a cross-sectional view taken along the line EE of FIG. 14. FIG. After inserting the positioning protrusion 55 into the positioning recess 25 , the threaded part 70 is passed through the threaded part insertion hole 52 provided in the flange 51 of the magnetism collecting yoke assembly 40 , and the threaded part 70 is formed in the bottom 26 of the positioning recess 25 . It is screwed into the screw hole 27 . Specifically, the threaded hole 27 is threaded into the threaded hole 27 by passing it through the threaded component insertion hole 52 formed by the inner peripheral surface 62 of the metal bush 60 provided in the flange 51 . As a result, the magnetic collecting yoke assembly 40 is attached to the column housing 10 by pressing the metal bush 60 provided on the flange 51 against the bottom portion 26 of the positioning recess 25 through the screw hole 27 .

When attaching the magnetism collecting yoke assembly 40 to the column housing 10 , at least part of the positioning protrusion 55 provided on the flange 51 of the magnetism collecting yoke assembly 40 is formed on the sensor installation portion 20 of the column housing 10 . It is inserted while being in contact with the positioning recess 25 that is positioned. As a result, the magnetic collecting yoke assembly 40 can be attached to the column housing 10 without any variation. Therefore, the magnetism collection yoke 41 of the magnetism collection yoke assembly 40 can be arranged at a desired position within the column housing 10 . As a result, the clearance g (see FIG. 7) between the magnet collecting yoke 41 in the column housing 10 and the ring portion 31 of the stator 30 can be made as designed.

As described above, in the torque sensor 1 according to the present embodiment, the screw part insertion hole 52 and the positioning convex portion 55 are formed in the flange 51 of the magnetic collecting yoke assembly 40, and the sensor installation portion 20 of the column housing 10 has A positioning recess 25 and a screw hole 27 are formed. Of these, the positioning recess 25 is configured such that the positioning protrusion 55 is inserted and at least a part of the positioning protrusion 55 contacts, and the screw hole 27 is formed so that the threaded part 70 passing through the threaded part insertion hole 52 is inserted. are screwed together. As a result, in the torque sensor 1 in which the magnetism collecting yoke assembly 40 is attached to the column housing 10 by the threaded part 70, high-precision machining for enhancing the positioning accuracy between the stator 30 and the magnetism collecting yoke 41 is not performed in a wide range. The positioning accuracy can be enhanced only with the positioning convex portion 55 and the positioning concave portion 25 . As a result, it is possible to improve the positioning accuracy while suppressing an increase in manufacturing cost.

In addition, since the positioning protrusion 55 is lightly press-fitted into the positioning recess 25, the positioning accuracy when mounting the magnetic flux collection yoke assembly 40 to the column housing 10 can be further enhanced. As a result, it is possible to improve the positioning accuracy while suppressing an increase in manufacturing cost.

In addition, since the positioning protrusion 55 is formed with a protrusion 57 that extends in the direction in which the positioning protrusion 55 is inserted into the positioning recess 25 and protrudes from the outer peripheral surface 56 of the positioning protrusion 55, the positioning protrusion 55 is positioned within the positioning recess. 25 , the protrusion 57 can be inserted while being in contact with the inner peripheral surface of the positioning recess 25 . Thereby, the positioning accuracy using the positioning protrusions 55 and the positioning recesses 25 can be further enhanced. As a result, it is possible to improve the positioning accuracy while suppressing an increase in manufacturing cost.

In addition, since the protrusion 57 is formed in an arcuate shape when viewed in the extending direction of the protrusion 57, the positioning accuracy using the positioning protrusion 55 and the positioning recess 25 can be improved by the protrusion 57. It is possible to smoothly insert the positioning convex portion 55 into the positioning concave portion 25 while raising the positioning convex portion 55 . As a result, the magnetic collecting yoke assembly 40 can be easily attached to the column housing 10, and the positioning accuracy can be improved while suppressing an increase in manufacturing cost.

In addition, the metal bushing 60 is arranged on the flange 51, and the threaded part insertion hole 52 is formed by the inner peripheral surface 62 of the metal bushing 60. The threaded part 70 can ensure strength when the magnet collecting yoke assembly 40 is attached to the column housing 10 . As a result, it is possible to improve the positioning accuracy while suppressing an increase in manufacturing cost.

In addition, since the uneven portion 64 is formed on the outer peripheral surface 63 of the metal bushing 60 , the degree of adhesion between the flange 51 and the metal bushing 60 can be increased, and the metal bushing 60 does not come off from the flange 51 . can be suppressed. As a result, it is possible to improve the positioning accuracy while suppressing an increase in manufacturing cost.

Further, in the manufacturing method of the torque sensor 1 according to the present embodiment, since the positioning recess 25 is processed in the sensor installation portion 20 of the column housing 10 and the pilot hole of the screw hole 27 is processed at the same time, the positioning recess 25 and the screw are processed. The number of work steps in forming the holes 27 can be reduced. As a result, it is possible to improve the positioning accuracy while suppressing an increase in manufacturing cost.

[Modification]
In the torque sensor 1 according to the above-described embodiment, the metal bush 60 is prevented from slipping out of the flange 51 by forming the uneven portion 64 on the outer peripheral surface 63 . You may suppress omission by. FIG. 16 is a modification of the torque sensor 1 according to the embodiment, and is an explanatory diagram of a case in which a slit 65 is formed in the metal bush 60. As shown in FIG. For example, as shown in FIG. 16 , the metal bushing 60 may have a slit 65 that is inclined with respect to the axial direction from one end side to the other end side in the axial direction of the metal bushing 60 . If a slit 65 inclined with respect to the axial direction is formed in the metal bushing 60, the edge of the slit 65 is caught by the flange 51, and the slit 65 allows the metal bushing 60 to slip out of the flange 51 in the axial direction. It produces a force that resists the intended movement. This makes it difficult for the metal bush 60 to come off from the flange 51 .

Further, by forming the slits 65 in the metal bush 60, the metal bush 60 can have elasticity acting in the direction in which the width of the slits 65 increases. As a result, the metal bush 60 arranged on the flange 51 can apply a force to the flange 51 in such a direction that the width of the slit 65 increases and the metal bush 60 comes into close contact with the flange 51 . Therefore, this also makes it difficult for the metal bush 60 to come off from the flange 51 . As a result, it is possible to prevent the metal bush 60 from coming off from the flange 51, thereby suppressing an increase in manufacturing cost and improving the positioning accuracy.

Further, in the torque sensor 1 according to the above-described embodiment, the protrusion 57 formed on the positioning protrusion 55 of the magnetic collecting yoke assembly 40 is formed in an arc shape. You may be sentenced in a form other than that. FIG. 17 is a modification of the torque sensor 1 according to the embodiment, and is an explanatory diagram of a case where the protrusion 57 is formed in a rectangular shape. FIG. 18 is a modification of the torque sensor 1 according to the embodiment, and is an explanatory diagram of a case where the protrusion 57 has an edge portion 58. As shown in FIG. The protrusion 57 formed on the outer peripheral surface 56 of the positioning protrusion 55 is formed, for example, in a rectangular shape as shown in FIG. It may be formed in a shape having an edge portion 58 that protrudes outward. The positioning protrusion 57 is positioned relative to the positioning recess 25 depending on the relative size of the outer diameter of the positioning protrusion 55 and the inner diameter of the positioning recess 25, the material of the positioning protrusion 55 and the column housing 10, and the like. It is preferable to form the shape so that the insertion is a light press fit.

Further, in the torque sensor 1 according to the above-described embodiment, the positioning protrusion 55 is provided with the three protrusions 57. may The number of protrusions 57 arranged on the positioning protrusion 55 does not matter as long as a plurality of protrusions 57 are arranged at equal intervals in the circumferential direction of the cylinder that is the shape of the positioning protrusion 55 .

Moreover, the number of protrusions 57 arranged on the positioning protrusions 55 may be different between the positioning protrusions 55 . FIG. 19 is a modified example of the torque sensor 1 according to the embodiment, and is an explanatory diagram in which the number of projections 57 differs between the positioning projections 55 . The positioning protrusions 55 are provided on each of the flanges 51 formed on both sides of the body 50 of the magnet collecting yoke assembly 40. The protrusions 57 protruding from the outer peripheral surface 56 of the positioning protrusions 55 55 may be different. For example, as shown in FIG. 19, three protrusions 57 are arranged on the positioning protrusion 55 provided on one flange 51 of the two flanges 51, and the positioning protrusion provided on the other flange 51 Two protrusions 57 may be arranged on 55 .

In the case where two protrusions 57 are arranged, the protrusions 57 can be arranged so as to line up along the axial direction of the stator 30 . By arranging the protrusions 57 so as to line up along the axial direction of the stator 30, the protrusions 57 arranged along the axial direction can be brought into contact with the column housing 10, so that the magnetism collecting yoke assembly can be improved. 40 can be restrained from moving in the axial direction. By suppressing the movement of the magnetism collection yoke assembly 40 in the axial direction, it is possible to suppress the change in the relative position between the stator 30 and the magnetism collection yoke assembly 40, so that the output of the torque sensor 1 is reduced. Fluctuation can be suppressed. That is, when two protrusions 57 are arranged, by arranging the protrusions 57 so as to line up along the axial direction of the stator 30, fluctuations in the output of the torque sensor 1 can be suppressed.

By making the number of protrusions 57 different between the positioning protrusions 55, the positioning protrusions 55 having the larger number of protrusions 57 can be inserted into the positioning recesses 25 with high positional accuracy, and the protrusions The positioning convex portion 55 with the smaller number of 57 can be inserted into the positioning concave portion 25 while allowing a certain amount of relative displacement. As a result, even if a slight dimensional error occurs when forming the positioning protrusion 55 or the positioning recess 25, the dimensional error can be minimized while ensuring the positioning accuracy when attaching the magnetic collecting yoke assembly 40 to the column housing 10. It can be absorbed and installed.

Although 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 the embodiments and modifications may be combined as appropriate.

Reference Signs List 1 Torque sensor 10 Column housing 11 Case part 20 Sensor installation part 22 Case insertion hole 25 Positioning concave part 26 Bottom part 27 Screw hole 30 Stator 35 Magnet 40 Magnetic collecting yoke assembly 41 Magnetic collecting yoke 42 Hall IC
50 Body 51 Flange 52 Threaded Part Insertion Hole 55 Positioning Convex Part 56, 63 Outer Peripheral Surface 57 Protruding Part 58 Edge Part 60 Metal Bush 62 Inner Peripheral Surface 64 Uneven Part 65 Slit 70 Threaded Part 80 Steering Device

Claims (11)

A housing in which a stator is arranged, a cylindrical magnet arranged to face the stator, and a change in magnetic flux according to relative positional changes between the stator and the cylindrical magnet are detected. a magnetic collection yoke assembly comprising a magnetic collection yoke of
The magnetic collection yoke assembly has a body that exposes and holds the magnetic collection yoke, and a flange that protrudes from the body,
The flange has a plurality of threaded part insertion holes through which threaded parts used for mounting the magnetism collection yoke assembly to the housing pass, and a plurality of threaded part insertion holes located around the threaded part insertion holes and attached to the housing of the flange. A plurality of positioning protrusions protruding from the side surface are formed,
the housing has a sensor installation portion to which the magnetism collecting yoke assembly is attached;
The sensor installation portion includes a housing insertion hole through which the magnetic collecting yoke exposed from the body is inserted from the outside of the housing to the inside of the housing, and the positioning unit recessed from the sensor installation portion. A plurality of positioning recesses into which projections are inserted and at least a portion of the positioning projections contact; A torque sensor formed with a plurality of threaded holes to be screwed together. The torque sensor according to claim 1, wherein the positioning protrusion is lightly press-fitted into the positioning recess. The torque sensor according to claim 1 or 2, wherein the positioning protrusion has a protrusion extending in an insertion direction of the positioning protrusion into the positioning recess and protruding from an outer peripheral surface of the positioning protrusion. 4. The torque sensor according to claim 3, wherein the protrusion is formed in an arcuate shape when viewed in the extending direction of the protrusion. 4. The torque sensor according to claim 3, wherein the protrusion is formed in a rectangular shape when viewed in the extending direction of the protrusion. The torque sensor according to claim 3, wherein the protrusion is formed in a shape having an edge portion when viewed in the extending direction of the protrusion. The torque sensor according to any one of claims 3 to 6, wherein the protrusions are arranged in different numbers among the positioning protrusions. A metal bush formed in a substantially cylindrical shape is arranged on the flange,
The torque sensor according to any one of claims 1 to 7, wherein the threaded part insertion hole is formed by an inner peripheral surface of the metal bush. 9. The torque sensor according to claim 8, wherein an outer peripheral surface of the metal bush is formed with an uneven portion in which unevenness is repeated. The torque sensor according to claim 8, wherein the metal bush has a slit inclined with respect to the axial direction. A housing in which a stator is arranged, a cylindrical magnet arranged to face the stator, and a change in magnetic flux according to relative positional changes between the stator and the cylindrical magnet are detected. and a magnetic collecting yoke assembly comprising:
The magnetic collection yoke assembly has a body that exposes and holds the magnetic collection yoke, and a flange that protrudes from the body,
The flange has a plurality of threaded part insertion holes through which threaded parts used for mounting the magnetism collection yoke assembly to the housing pass, and a plurality of threaded part insertion holes located around the threaded part insertion holes and attached to the housing of the flange. A plurality of positioning protrusions protruding from the side surface are formed,
the housing has a sensor installation portion to which the magnetism collecting yoke assembly is attached;
The sensor installation portion includes a housing insertion hole through which the magnetic collecting yoke exposed from the body is inserted from the outside of the housing to the inside of the housing, and the positioning unit recessed from the sensor installation portion. A plurality of positioning recesses into which projections are inserted and at least a portion of the positioning projections contact; In a torque sensor formed with a plurality of threaded holes to be screwed together,
A method of manufacturing a torque sensor in which the pilot hole of the screw hole is machined at the same time as the positioning recess is machined.

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