KR101632692B1 - Steering angle sensor module - Google Patents

Abstract

The present invention discloses a steering angle sensor module configured so that a main gear coupled with a stator holder can maintain the shape of a circle. The steering angle sensor module according to the present invention is formed with a plurality of coupling structures that are engaged with each other at the front end portion of the stator holder and the outer peripheral surface of the main gear. Here, each of the engaging structures is a protrusion formed on a key groove formed in a front end portion of the stator holder and an inner circumferential surface of the main gear. When the stator holder and the main gear are engaged, the protrusion of the main gear is accommodated in the keyway of the stator holder. Further, another type of coupling structure is a keyway formed in a protruding portion formed on the outer circumferential surface of the stator holder and an inner circumferential surface of the main gear, and when the stator holder and the main gear are engaged, the protruding portion of the stator holder is accommodated in the keyway of the main gear. In particular, it is preferable that a plurality of coupling structures is equal to the interval between two adjacent coupling structures (angular interval or length interval on the circumference) between adjacent two coupling structures.

Steering angle sensor module, stator holder, main gear

Description

Steering angle sensor module [0002]

The present invention relates to a steering angle sensor module, and more particularly, to a steering angle sensor module configured such that a main gear coupled with a stator holder can maintain a shape of a round circle.

A steering apparatus used in a vehicle is a device that changes the direction of a steering wheel through a steering wheel to change the traveling direction of the vehicle while driving.

In recent years, an electric power steering system (hereinafter referred to as "EPS system") is applied to a steering apparatus in consideration of driving stability and user convenience, and this EPS system includes a steering angle measuring apparatus and a torque measuring apparatus .

The steering angle measuring device (module) includes a steering angle sensor, which measures the steering angle (absolute angle) of the steering wheel required to control the vehicle while driving.

The torque sensor (module) is equipped with a torque sensor, which measures the torque applied to the torsion bar to smoothly operate the steering wheel.

The steering angle sensor and the torque sensor as described above are individually modularized together with other constituent members in the torque angle sensor assembly, i.e., a steering angle sensor module and a torque sensor module.

FIG. 1 is an exploded perspective view of a steering angle sensor module constituting a general electric power steering system, and FIG. 2 is a plan view of the respective members shown in FIG. 1. FIG.

The steering angle sensor module 1 constituting the electric power steering system includes a first casing 10, a printed circuit board 30, and a second casing 20.

In the first housing 10, a main gear 13, which rotates in accordance with the rotation of a position rotor, is rotatably disposed at a central portion thereof. That is, the ring-shaped main gear 13 is mounted on a cylindrical stator holder (not shown), which is rotatably mounted on the first housing 10 and connected to the position rotor.

Here, the main gear 13 and the stator holder are engaged with each other in a state in which the inner peripheral surface of the main gear 13 is in contact with the outer peripheral surface of the stator holder. On the other hand, two recesses 11-1 and 12-1 are formed on the outer periphery of the inner surface of the first housing 10, that is, the periphery of the main gear 13, and the first and second gears 11 and 12, Are respectively rotatably mounted in the recesses 11-1 and 12-1 by a rotary shaft.

On the other hand, the first gear 11 (i.e., the gear portion 11a) is engaged with the main gear 13, and the second gear 12 is engaged with the first gear 11. Accordingly, the first and second gears 11 and 12 are rotated in opposite directions to each other by the rotation of the main gear 13. Here, the magnets M1 and M2 are fixed to the ends of the rotating shafts of the first and second gears 11 and 12, respectively.

A circular opening 33 corresponding to the main gear 13 mounted on the first casing 10 is formed at the center of the printed circuit board 30 disposed between the first casing 10 and the second casing 20 And the first and second rotary hole ICs 31 and 32 (rotary hall ICs) are fixed around the opening 33. In addition, a plurality of electronic circuit components (not shown in the drawings) are arranged in the outer frame portion.

The steering angle sensor module 1 is assembled by fastening the second casing 20 to the first casing 10 while the printed circuit board 30 is fixed on the second casing 20. [

Fig. 3 shows the first and second gears 11 and 12 mounted on the first casing 10 shown in Fig. 2 after the steering angle sensor module is assembled, and the first and second gears 11 and 12 mounted on the printed circuit board 30, 2 Rotary Hall ICs 31 and 32. The central portion of the first and second gears 11 and 12 mounted on the first casing 10 is connected to the printed circuit board 30 And the first and second rotary hole ICs 31 and 32 mounted on the first rotary hole IC 31 and the second rotary hole IC 31 respectively.

In the steering angle sensor module 1, the first and second gears 11 and 12 rotate in opposite directions in accordance with the rotation of the position rotor, that is, the rotation of the main gear 13, 11 and 12 are transmitted to the first and second rotary hole ICs 31 and 32. Accordingly, the first and second rotary hole ICs 31 and 32 are connected to the first and the second rotary hole ICs 31 and 32, (31 and 32) output a sensing signal, respectively.

One factor that determines the performance of the steering angle sensor module is hysteresis. The hysteresis in the steering angle sensor module is obtained when the main gear 13 rotates in different directions, that is, when the main gear 13 rotates counterclockwise, the hysteresis occurs in the first and second rotary hole ICs 31 and 32 And the output from the first and second rotary Hall ICs 31 and 32 when the clockwise rotation is performed.

A gear backlash between the main gear 13 and the first gear 11 and a clearance between the main gear 13 and the stator holder are known to cause such a difference in output.

Generally, a single key groove is formed on the outer circumference of the stator holder to reduce the clearance between the main gear 13 and the stator holder and to accurately transmit the rotational force of the stator holder to the main gear 13, A single protruding portion is integrally formed on the inner peripheral surface. In this structure, when the main gear 13 and the stator holder are engaged, the protrusion of the main gear 13 is accommodated in the keyway of the stator holder.

When the main gear 13 and the stator holder are coupled (interference fit) by the injection molding process using a synthetic resin, the peripheral region of the protrusion of the main gear 13 is formed with protrusions by the engagement of the protrusions with the keyways As shown in FIG.

Due to such a phenomenon, the main gear 13 manufactured in a shape of a regular circle has a shape in which a part of the main gear 13 protrudes in the radial direction after being coupled with the stator holder.

When the first gear 11 is engaged with the main gear 13 having a shape in which a part of the area other than the main circle is protruded as described above, the first gear 11 is rotated by the projecting area of the main gear 13, So that the first gear 11 and the second gear 12 are not accurately rotated.

Such a phenomenon acts as a cause of lowering the accuracy of the steering degree measured by the steering angle sensor module 1. [

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems occurring in the process of engaging a stator holder and a main gear, and it is an object of the present invention to provide a steering gear sensor, Module.

According to an embodiment of the present invention, there is provided a torque angle sensor assembly including a steering angle sensor including a stator holder, a main gear mounted on a stator holder, a first gear meshed with the main gear and a second gear meshed with the first gear, The module is formed with a plurality of engaging structures engaging with each other at the distal end of the stator holder and the outer peripheral surface of the main gear.

Here, each of the engaging structures is a protrusion formed on the inner circumferential surface of the main gear and the key groove formed in the front end of the stator holder. When the stator holder and the main gear are engaged, the protrusion of the main gear is accommodated in the key groove of the stator holder.

Further, another type of coupling structure is a keyway formed in a protruding portion formed on the outer circumferential surface of the stator holder and an inner circumferential surface of the main gear, and when the stator holder and the main gear are engaged, the protruding portion of the stator holder is accommodated in the keyway of the main gear.

In particular, it is preferable that a plurality of coupling structures is equal to the interval between two adjacent coupling structures (angular interval or length interval on the circumference) between adjacent two coupling structures.

The following effects can be expected from the steering angle sensor module according to the present invention.

(Joint structure) of the main gear is accommodated in each of the key grooves (engagement structure) of the stator holder, a partial clearance is not generated between the front inner circumferential surface of the main gear and the front outer circumferential surface of the stator holder 200, Thereby maintaining a uniform contact state.

Further, when the main gear of the positive circle, which is not formed with a protruding portion in a specific region, rotates while engaged with the first gear, an excessive load does not act on the first gear, The first gear and the second gear are accurately rotated.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 is an exploded perspective view of the stator holder and the main gear of the steering angle sensor module according to the present invention, and FIG. 5 is a plan view of the stator and main gear shown in FIG.

The overall configuration of the steering angle sensor module according to the present invention is the same as the overall configuration of the steering angle sensor module shown in Figs. 1 to 3, and therefore, in Figs. 4 and 5, And main gear only.

The position rotor 300 is located in the center of the first housing (10 in Fig. 1, not shown in Fig. 4 and Fig. 5). A cylindrical stator holder 100 is mounted on the position rotor 300, and accordingly, the stator holder 100 rotates according to the rotation of the position rotor 300.

A ring-shaped main gear 200 is mounted on the stator holder 100. 5, the stator holder 100 and the main gear 200 are engaged with each other in a state where the outer circumferential surface of the stator holder 100 and the inner circumferential surface of the main gear 200 are in contact with each other.

The most significant feature of the present invention is that a large number of coupling structures are formed at the front end portion of the stator holder 100 and the inner circumferential surface of the main gear 200.

That is, a plurality of key grooves 101, 102, 103 and 104 are formed in the front end portion of the stator holder 100 (i.e., the corresponding portion of the main gear 200) A plurality of protrusions 201, 202, 203 and 204 having a predetermined height (radial direction) and a width (circumferential direction) are formed.

When the stator holder 100 having such a structure and the main gear 200 are engaged with each other, the protrusions 201, 202, 203 and 204 formed on the inner circumferential surface of the main gear 200 are engaged with the corresponding keys of the stator holder 100 102, 103 and 104, respectively.

A plurality of keyways 101, 102, 103, and 103 formed on the circumferential surface of the stator holder 200 when the main gear 200 and the stator holder 100, which are manufactured through the injection molding process using a synthetic resin, Since the protrusions 201, 202, 203 and 204 of the main gear 200 are accommodated in the main gear 200 and the protrusions 201, 202, 203 and 204 of the main gear 200, respectively, It is not pushed by the adjacent protruding portion (the state accommodated in the key groove). Therefore, even after the coupling with the stator holder 100, the main gear 200 maintains the shape of a regular circle as a whole.

The stator holder 100 and the main gear 200 coupled in this state have the following advantages in their function.

1) Since the protrusions 201, 202, 203 and 204 of the main gear 200 are accommodated in the plurality of keyways 101, 102, 103 and 104 of the stator holder 200, A partial clearance is not generated between the outer circumferential surface of the stator holder 200 and the front outer circumferential surface of the stator holder 200, so that both surfaces maintain a uniform contact state.

2) When the main gear 200 of a positive circle in which a protruding portion is not formed in a specific region is rotated in engagement with the first gear (11 of Figs. 1 to 3), the first gear 11 The first gear and the second gear (12 in Figs. 1 to 3) are accurately rotated as the main gear 200 rotates. Therefore, the accuracy of the degree of steering of the steering wheel, as measured by the steering angle sensor module, is improved.

4 and 5, four key grooves 101, 102, 103 and 104 are formed in the stator holder 100 and four protrusions 201, 202, 203 and 204 are formed on the inner circumferential surface of the main gear 200, However, the present invention is not limited thereto.

That is, the number of protrusions and keyways is not limited unless the peripheral region is pushed to a specific region due to the engagement of the protrusion and the key groove. In particular, it is preferable that the interval (angular interval or length interval on the circumference) between two adjacent keyways (protrusions) is equal to the interval between two adjacent adjacent keyways (protrusions).

Here, when only two keyways are formed in the stator holder 200 on the straight line passing through the center of the main gear 200 and only two protrusions are formed in the main gear 200, the interval between the protrusions is too wide .

Therefore, when the protrusion and the key groove are engaged, the area around each protrusion of the main gear 200 can be pushed to a region where the protrusion is not formed. In order to prevent this, it is preferable that the stator holder 200 and the main gear 200 have three or more keyways and protrusions each having an angular interval of 120 degrees.

It will be apparent to those skilled in the art that various modifications, additions and substitutions are possible, without departing from the spirit and scope of the present invention, as defined by the appended claims, Modifications and additions should be regarded as falling within the scope of the following claims.

4 and 5, that is, a plurality of protrusions are formed on the outer circumferential surface of the stator holder 200 and a plurality of keyways are formed on the inner circumferential surface of the main gear 200, Functions and effects can be obtained.

1 is an exploded perspective view of a steering angle sensor module constituting a general electric power steering system;

2 is a plan view of each member shown in Fig.

3 is a perspective view showing the relationship between the first and second gears mounted on the upper casing shown in FIG. 2 and the first and second rotary hole ICs mounted on the printed circuit board.

4 is an exploded perspective view of a stator holder and a main gear of a steering angle sensor module according to the present invention.

5 is a plan view of the stator holder and the main gear shown in Fig. 4 assembled; Fig.

Claims (4)

A steering angle sensor module comprising a stator holder, a main gear mounted on a stator holder, a first gear meshed with the main gear, and a second gear engaged with the first gear, The stator holder and the main gear are coupled to each other through the coupling structure, and the stator holder and the main gear are coupled to each other through the coupling structure, The intervals (angular intervals or length intervals on the circumference) between two adjacent bonding structures of the above bonding structures are the same as those of the other two adjacent bonding structures, Wherein each of the engaging structures includes a key groove formed in a front end portion of the stator holder and a protrusion formed on an inner circumferential surface of the main gear or a protrusion formed on an outer circumferential surface of the stator holder and a key groove formed on an inner circumferential surface of the main gear, Wherein when the holder and the main gear are engaged, the protrusion is received in the key groove, and the key groove and the protrusion are engaged one by one. delete delete delete

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