JP4868869B2 - Fitting structure of gear and fitting member - Google Patents

Description

  The present invention relates to a fitting structure of a gear and a fitting member that rotates by fitting and holding a predetermined fitting member in the rotation center portion of the gear, and more specifically, a holding hole is formed in the rotation center portion of the gear and the fitting hole is formed. By fitting and holding the fitting member in the holding hole, the overall shape is related to a fitting structure of the gear and the fitting member which is to be thinned and miniaturized.

  Conventionally, for example, in order to detect the rotation state of a certain functional member, a gear is engaged with the functional member, and a magnet (fitting member) is fitted to the rotation center of the gear, and the magnet is combined with the gear. There is a sensor device that detects a rotation of a functional member by detecting a voltage change that occurs in an electric circuit such as a coil provided around it by rotating.

As such a rotation detection device, a holding hole is formed in the center of rotation of the rotating body, and a plate-like magnet is provided in the holding hole, and when the magnet is inserted into this holding hole, it bends in an insertion allowable direction. And the thing provided with the flexible nail | claw member which presses a magnet toward inner side downward simultaneously with insertion is proposed (for example, refer patent document 1).
JP 2000-283705 A

  However, in such a rotation detection device, as shown in FIG. 7, four hook-shaped flexible claw members 13 are provided at four orthogonal positions on the web surface 12 on one side of the gear 11. By pushing the magnet 14 (fitting member) from above the claw member 13 as indicated by the arrow A, the flexible claw member 13 is restored after being bent as indicated by the arrows B and C, and the magnet 14 is flexed. The flexible claw member 13 protrudes on the web surface 12 on one side of the gear 11 because the claw member 13 and the stopper member 15 are held in a snap-fit manner. In this case, the total thickness is larger than the combined thickness of the gear 11 and the magnet 14. Moreover, although the flexible nail | claw member 13 must be higher than the thickness of the magnet 14, when this is made low, there exists a possibility that it may break when pushing in the magnet 14. FIG. Therefore, the flexible claw member 13 requires a certain height or more.

  In such a fitting structure of the gear 11 and the magnet 14 (fitting member), the entire shape including the gear 11 and the flexible claw member 13 becomes thick and large. In this case, even if the gear 11 is made thinner, a flexible claw member 13 that is higher than the thickness of the magnet 14 is required. Therefore, as long as the flexible claw member 13 is used, the overall shape is made thinner and smaller. I couldn't. Therefore, it may not be applicable to functional members that are required to be thin and small.

  Accordingly, the present invention addresses such problems and attempts to reduce the overall shape and size by forming a holding hole in the center of rotation of the gear and fitting and holding the fitting member in the holding hole. An object of the present invention is to provide a fitting structure between a gear and a fitting member.

In order to achieve the above object, the gear / fitting member fitting structure according to the present invention has a plurality of teeth on the outer peripheral surface, and a holding hole having a predetermined radius is formed in the inner rotation center portion. A resin gear that is rotated by meshing with the teeth of the gear and a fitting member that is fitted and held inside the holding hole and rotates integrally with the gear, and the gear is held in the holding hole of the gear. A fitting structure in which fitting members are fitted and combined, and in the holding hole of the gear, can be expanded by being elastically deformed at a plurality of locations on the inner peripheral wall, and the radial direction of the holding hole at both ends. In addition to providing locking members having end members extending at predetermined intervals, a stopper block extending toward the rotation center of the gear is provided between the locking members, and on the outer peripheral surface side of the fitting member, The portion corresponding to the locking member of the gear is engaged with the locking member. Of the fitting member, with the direction of fitting the said engaging member in a center axis direction of the holding hole of the gear the holding hole provided a protrusion for restricting movement in the opposite direction, the gear An anti-rotation member that engages with the end member of the locking member to prevent the fitting member from rotating is provided at a portion corresponding to the stopper block of the locking member, and the fitting member is positioned at the position of the stopper block in the holding hole of the gear. In a state where the rotation stopper member is matched and the fitting member is inserted into the holding hole, the protrusion is engaged with the lower surface side of the locking member, and the lower surface of the rotation stopper member is on the upper surface of the stopper block. The movement of the holding hole of the fitting member in the circumferential direction and the central axis direction is regulated by the contact and the rotation stopper member engaging with the end member.

With such a configuration, the locking members provided at predetermined intervals on the inner peripheral wall of the gear holding hole are elastically deformed and expanded, and the engagement of the gear on the outer peripheral surface side of the fitting member. projections provided at positions corresponding to the stop member holds the engagement member engages the engagement member, center of the holding hole of the fitting member in the stopper block provided between said locking member The movement in the axial direction is restricted, and the rotation prevention member provided at the portion corresponding to the stopper block of the gear engages with the end member of the locking member to prevent the fitting member from rotating, thereby holding the gear. A fitting member is fitted and combined in the hole.

Further, the locking member and the stopper block in the holding hole of the gear are provided at three positions at equal intervals on the inner peripheral wall of the holding hole, and the protrusion on the outer peripheral surface side of the fitting member and the rotation stopper member are provided on the outer peripheral surface. Are provided at three equal intervals. Accordingly, the locking member and the stopper block provided at three positions at equal intervals on the inner peripheral wall of the holding hole of the gear, and the protrusion and the rotation stopping member provided at three positions at equal intervals on the outer peripheral surface of the fitting member And the fitting member is stably held in the holding hole of the gear and is prevented from rotating.

  Furthermore, the fitting member is a substantially disk-shaped magnet. As a result, the substantially disc-shaped magnet is used as a fitting member, and the fitting member is fitted and combined in the holding hole of the gear.

According to the first aspect of the present invention, the locking members provided at predetermined intervals on the inner peripheral wall of the gear holding hole are elastically deformed and expanded, and on the outer peripheral surface side of the fitting member. projections provided at positions corresponding to the locking member of said gear to hold the engagement member engages the engagement member, the holding of the fitting member in the stopper block provided between said locking member restricting the movement of the heart axis in the hole, the rotation stopping member provided at positions corresponding to the stopper block of the gear is prevented from rotating the engaging member engages the end member of the locking member A fitting member can be fitted and combined in the holding hole of the gear. Therefore, the fitting member can be fitted and held in the holding hole formed in the rotation center portion of the gear. From this, it is possible to make the entire shape thinner and smaller by fitting it within the thickness of the gear without providing any holding member protruding from the web surface of the gear. Moreover, when applied to a sensor device that detects rotation of a functional member, a highly accurate sensor device can be realized.

Further, according to the invention of claim 2, the locking member and the stopper block provided at three positions at equal intervals on the inner peripheral wall of the holding hole of the gear, and three positions at equal intervals on the outer peripheral surface of the fitting member The provided protrusion and the rotation preventing member are engaged with each other, so that the fitting member can be stably held in the holding hole of the gear and can be prevented from rotating. Therefore, when applied to a sensor device that detects rotation of a functional member, a highly accurate sensor device can be realized.

  Furthermore, according to the invention which concerns on Claim 3, a substantially disk-shaped magnet can be used as a fitting member, and a fitting member can be fitted and combined in the holding hole of a gearwheel. Therefore, the present invention can be applied to a sensor device that detects a change in voltage generated in an electric circuit such as a coil provided around a rotating magnet and detects the rotation of the functional member.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a plan view showing a gear 1 used in a fitting structure between a gear and a fitting member according to the present invention, and FIG. 2 is a fitting member 2 used in the fitting structure between the gear and the fitting member according to the present invention. FIG. 3 is a perspective view showing the relationship between the gear 1 and the fitting member 2. The fitting structure of the gear and the fitting member is such that, for example, a predetermined fitting member 2 is fitted and held at the rotation center of the gear 1 in order to detect the rotation state of a certain functional member. The gear 1 and the fitting member 2 are combined and used as an example for an automobile steering angle sensor gear.

The gear 1 is rotated by meshing with a tooth of a counterpart gear attached to a certain functional member (for example, a steering shaft of an automobile), and is entirely made of resin and has a plurality of teeth 3 on an outer peripheral surface. A holding hole 4 having a predetermined radius is formed in the inner rotation center. This holding hole 4 is for fitting a fitting member 2 to be described later inside, and has a predetermined radius larger than that of the fitting member 2 around the rotation center O ₁ of the gear 1 as shown in FIG. Thus, the gear 1 is formed so as to penetrate in the thickness direction.

A locking member 5 is provided on the inner peripheral wall of the holding hole 4 of the gear 1. The locking member 5 is engaged with a part of the fitting member 2 (protrusion 8 described later) to hold the fitting member 2, and is provided at a plurality of locations on the upper part of the inner peripheral wall of the holding hole 4. It is provided at predetermined intervals and can be expanded by elastic deformation. In the example of FIG. 1, three places are provided at equal intervals (120 degree intervals). As shown in FIG. 1, the specific shape of the locking member 5 includes, for example, a central member 5a formed in a circular arc shape at a position slightly inside the holding hole 4 and both end portions thereof. And end members 5b and 5c extending in the radial direction. The upper corner portion of the rotation center O ₁ side of the central member 5a is chamfered 6 is applied obliquely, as shown in FIG. As a result, the central member 5a is elastically deformed in the radial direction by the pressing of the protrusion 8 of the fitting member 2 described later, and can be expanded.

A stopper block 7 is provided between the adjacent locking members 5 and 5 in the holding hole 4 of the gear 1. The stopper block 7 is engaged with another part of the fitting member 2 (rotation stopper member 10 described later) to restrict the movement of the fitting member 2 in the central axis direction of the holding hole 4. The holding holes 4 are provided at predetermined intervals at a plurality of locations on the inner peripheral wall. In the example of FIG. 1, three places are provided at equal intervals (120 degree intervals). Specifically, as shown in FIGS. 3 and 4, at a position lower than the above-described locking member 5, the length is shorter than the end members 5 b and 5 c toward the rotation center O ₁ of the gear 1. It extends. As shown in FIG. 1, the end members 5b and 5c of the adjacent locking members 5 and 5 and the stopper block 7 therebetween provide the circumferential direction and the central axis of the holding hole 4 of the fitting member 2. A stopper member that restricts movement in the direction is configured.

  The fitting member 2 is fitted and held inside the holding hole 4 of the gear 1. The fitting member 2 rotates integrally with the gear 1 and is fitted in a substantially circular space formed by a plurality of locking members 5 provided at predetermined intervals in the holding hole 4 of the gear 1. For example, it is made of a substantially disk-shaped magnet (permanent magnet).

As shown in FIG. 2, a protrusion 8 is provided on the outer peripheral surface side of the fitting member 2 at a portion corresponding to the locking member 5 of the gear 1. The protrusions 8 are engaged with the lower surface side of the locking member 5 of the gear 1 to hold the fitting member 2, and are provided at predetermined intervals at a plurality of locations on the outer peripheral surface side of the fitting member 2. Yes. In the example of FIG. 2, three places are provided at equal intervals (120 degree intervals). Specifically, it protrudes in the radial direction from the center O ₂ of the fitting member 2 with a predetermined short dimension, and as shown in FIG. 4, an obliquely inwardly tapered surface 9 is formed on the outer end face thereof. Thereby, when the projection 8 is pressed against the central member 5a of the locking member 5 in the holding hole 4 described above, the central member 5a is elastically deformed in the radial direction and can be expanded.

Further, as shown in FIG. 2, a rotation stop member 10 is provided at a portion corresponding to the stopper block 7 of the gear 1 on the outer peripheral surface side of the fitting member 2. The anti-rotation member 10 is engaged with the stopper block 7 and the end members 5b and 5c to prevent the fitting member 2 from rotating, and at a predetermined interval at a plurality of locations on the upper part of the outer peripheral surface of the fitting member 2. Is provided. In the example of FIG. 2, three places are provided at equal intervals (120 degree intervals). Specifically, it protrudes from the center O ₂ of the fitting member 2 with a predetermined length in the radial direction.

  Next, a state in which the fitting member 2 is fitted and combined in the holding hole 4 of the gear 1 configured as described above will be described with reference to FIGS. First, in FIG. 4, the fitting member 2 is gripped by an automatic machine or the like (not shown), and the fitting member 2 is positioned above the gear 1 as indicated by reference numeral 2a. At this time, as shown in FIG. 3, the rotation stop member 10 of the fitting member 2 is positioned so as to match the position of the stopper block 7 in the holding hole 4 of the gear 1. In this state, an automatic machine or the like is operated to push down the fitting member 2 as shown by an arrow D. Then, as shown in FIG. 4, the fitting member 2 is in the position indicated by reference numeral 2 b, and the lower part of the fitting member 2 is inserted into the holding hole 4 of the gear 1, and the central member 5 a of the locking member 5 of the gear 1. The protruding portion 8 comes into contact with the upper surface of.

In this state, when the fitting member 2 is further pressed as indicated by an arrow D by an automatic machine or the like, the chamfer 6 of the central member 5a of the locking member 5 and the tapered surface 9 of the protrusion 8 of the fitting member 2 are abutted. The central member 5a of the locking member 5 is elastically deformed obliquely downward as shown by an arrow E as shown in FIG. Thus, central member 5a of the locking member 5 is expanded deflect radially outwardly from the rotation center O ₁ shown in FIG.

Further, when the fitting member 2 is pressed as shown by an arrow D by an automatic machine or the like, as shown in FIG. The center member 5a of the locking member 5 is restored to the bent state and contracts to the rotation center O ₁ side. Thereby, the protrusion 8 of the fitting member 2 is engaged with the lower surface side of the central member 5a of the locking member 5. At this time, the lower surface of the rotation stop member 10 of the fitting member 2 contacts the upper surface of the stopper block 7 of the gear 1. As a result, the fitting member 2 is fitted and held in the holding hole 4 of the gear 1, and the fitting structure of the gear 1 and the fitting member 2 is realized.

In the above description, the locking member 5 and the stopper block 7 of the gear 1 and the protrusion 8 and the rotation stopping member 10 of the fitting member 2 are provided at three locations, respectively. limited it not, may be provided at two locations or four locations or more symmetrical positions with respect to the center O ₂ of the center of rotation O ₁ or fitting member 2 of the gear 1. The fitting member 2 is not limited to a substantially disk-shaped magnet, and may be any predetermined functional member that is fitted and held in the holding hole 4 of the gear 1.

It is a top view which shows the gearwheel used for the fitting structure of the gearwheel by this invention, and a fitting member. It is a top view which shows the fitting member used for the fitting structure of the gearwheel and fitting member by this invention. It is a perspective view which shows the relationship between a gearwheel and a fitting member. It is sectional drawing which shows the state which fits and fits a fitting member in the holding hole of a gearwheel, and shows combining the XX sectional drawing of FIG. 1, and the YY sectional drawing of FIG. It is sectional drawing which shows the state which similarly fits and fits a fitting member in the holding hole of a gearwheel. It is sectional drawing which shows the state which similarly fits and fits a fitting member in the holding hole of a gearwheel. It is sectional explanatory drawing which shows the fitting structure of the gearwheel and fitting member in the conventional rotation detection apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Gear 2 ... Fitting member 3 ... Teeth 4 ... Holding hole 5 ... Locking member 5a ... Center member 5b, 5c ... End member 6 ... Chamfer 7 ... Stopper block 8 ... Projection part 9 ... Tapered surface 10 ... Anti-rotation part material

Claims (3)

A plurality of teeth on the outer peripheral surface, a holding hole having a predetermined radius is formed in the inner rotation center, and a resin gear that rotates by meshing with the teeth of the counterpart gear;
A fitting member that is fitted and held inside the holding hole and rotates integrally with the gear;
A fitting structure in which the fitting member is fitted and combined in the holding hole of the gear,
In the holding hole of the gear, elastically deformed at a plurality of locations on the inner peripheral wall thereof and can be expanded, and locking members having end members extending in the radial direction of the holding hole are provided at both ends at predetermined intervals. In addition, a stopper block extending toward the rotation center of the gear is provided between these locking members,
On the outer peripheral surface side of the fitting member, a portion corresponding to the locking member of the gear is engaged with the locking member, and the fitting member has a center axis direction of the holding hole of the gear. In addition, a protrusion that restricts the movement in the direction opposite to the direction in which the fitting member is fitted is provided in the holding hole, and an end member of the locking member is provided at a portion corresponding to the stopper block of the gear. A rotation stopper member that engages with and prevents the fitting member from rotating,
In a state where the rotation stop member of the fitting member is matched with the position of the stopper block in the holding hole of the gear and the fitting member is inserted into the holding hole,
The protrusion is engaged with the lower surface side of the locking member, the lower surface of the rotation preventing member is brought into contact with the upper surface of the stopper block, and the rotation stopping member is engaged with the end member. Restricting the movement of the holding hole of the joint member in the circumferential direction and the central axis direction;
A fitting structure of a gear and a fitting member. The locking member and the stopper block in the holding hole of the gear are provided at three positions at equal intervals on the inner peripheral wall of the holding hole, and the protrusion on the outer peripheral surface side of the fitting member and the rotation stopper member are on the outer peripheral surface. The fitting structure of a gear and a fitting member according to claim 1, wherein three places are provided at intervals.   3. A fitting structure between a gear and a fitting member according to claim 1, wherein the fitting member is a substantially disk-shaped magnet.

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