JP2017111002A - Rotation detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation detection device that can respond to every attachment specification and is easy to manufacture.SOLUTION: A sensor housing 5 of a wheel speed sensor 1 holds a sensor covering part 4 and a signal cable 2. The signal cable 2 is accommodated in the connection terminal 54 of the sensor housing 5, and a sensor cap 6 for changing the direction of its extraction is installed. An opening 61a of cylindrical shape is formed at end of the sensor cap 6. A plurality of engagement projections 61c are formed on the inner circumferential surface 61b of the opening 61a, and a plurality of engagement holes 54c are provided on the outer circumferential surface 54b of the connection terminal 54. When the sensor cap 6 is mounted in the sensor housing 5, the opening 61a of the sensor cap 6 and the connection terminal 54 of the sensor housing 5 are brought closer in the axial direction, making the outer circumferential surface 54b and the opening 61a fitted together and the engagement projection 61c and the engagement hole 54c engaged together.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a rotation detection device that detects a rotation state of a rotation member.

  In order to perform vehicle travel control, a rotation detection device that detects the rotation state of a wheel is used. This includes a magnetic sensor element and is attached to a knuckle arm or the like so as to be close to the sensor rotor of the wheel. When the sensor rotor rotates together with the wheel, the rotation detection device is configured to generate a pulse corresponding to the rotation speed of the wheel in the magnetic sensor element and detect the rotation state of the wheel.

  By the way, when the rotation detection device is attached to the vehicle, the routing of the signal line connected to the magnetic sensor element becomes a problem because the periphery of the wheel is a narrow space. That is, the routing of the signal line is considered according to the type of vehicle, whether it is attached to the front wheel or the rear wheel, and the direction in which the signal line is drawn from the sensor housing is set. Therefore, in order to cope with all the mounting specifications of the vehicle, it is necessary to provide a plurality of rotation detecting devices that have the same specifications for the detection performance of the rotation state of the wheels, but differ only in the direction of the signal lines. Will occur. For this reason, an increase in types of molds for forming the sensor housing and a complicated production line for the rotation detection device are caused.

  As a conventional technique for solving this problem, there has been a rotation detection device in which a member for changing a drawing direction of a signal line (hereinafter referred to as a drawing direction variable member) is attached to a sensor housing (see, for example, Patent Document 1). The rotation detection device according to the related art is formed so that the signal line is drawn straight out from the end of the sensor housing. If it is necessary to change the drawing direction of the signal line according to the specification of the vehicle, the signal line is restrained by a drawing direction variable member attached to the sensor housing, and the extending direction is changed. Thereby, only one type of sensor housing needs to be formed regardless of the mounting specifications to the vehicle, and the type of the mold can be reduced, and the production line of the rotation detection device can be simplified.

JP 2005-227177 A

  By the way, the drawing direction variable member included in the above-described rotation detection device according to the prior art is formed with a slit extending from an end portion connected to the sensor housing toward a distal end portion that guides the signal line. When attaching the drawing direction variable member to the sensor housing, the drawing direction variable member is moved in a substantially vertical direction with respect to the direction in which the signal line drawn from the sensor housing extends, and the end of the sensor housing and the signal line are connected to the slit. Through the drawing direction variable member. And the recessed part and convex part which were each formed in the outer peripheral surface of a sensor housing and the inner peripheral surface of a drawer direction variable member are engaged, and the drawer direction variable member is being fixed to the sensor housing.

Therefore, when a load is applied to the rotation detection device attached to the vehicle by vibration, stepping stones, or the like, the slit is expanded by the impact, and the drawing direction variable member may drop from the sensor housing. In order to prevent this, in order to increase the engagement force between the sensor housing and the pulling direction variable member, it is necessary to improve the dimensional accuracy of the concave and convex portions formed on both sides. There was a problem of making it difficult. Further, when the engagement force between the sensor housing and the drawing direction variable member is increased, the assembly load of both is increased, which may make it difficult to manufacture the rotation detection device.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rotation detection device that can cope with any mounting specification and is easy to manufacture.

  In order to solve the above-described problem, an invention of a rotation detection device according to claim 1 is based on a rotation state of a rotation member, a sensor unit that generates a rotation detection signal, and a rotation detection signal that is connected to the sensor unit. The transmission signal line and at least a part of each of the sensor unit and the signal line are held, and a cylindrical connection end portion through which the signal line penetrates is provided at one end portion, and the signal line is drawn from the connection end portion. The sensor housing has a cylindrical opening that is attached to the side of the connection end at one end, and the signal line extends by accommodating the signal line drawn from the sensor housing inside And a sensor cap that changes the position of the connection end in the state where the opening and the connection end are moved so as to approach each other in the axial direction. Fitted to the side, and By the convex portion and the concave portion formed on the inner peripheral surface side and the opening of the connection end portion is engaged, the sensor cap is mounted to the sensor housing.

According to this configuration, the sensor cap is provided by providing the connection end at one end of the sensor housing, forming the opening at one end of the sensor cap, and fitting the opening to the side surface of the connection end. It is attached to the sensor housing. Thereby, the extending direction of the signal line drawn from the sensor housing can be changed only by attaching the sensor cap to the sensor housing. Therefore, in the sensor housing, it is possible to provide a rotation detection device that can cope with any mounting specification only by forming a shape that draws the signal line in one direction.
The opening is formed in a cylindrical shape at one end of the sensor cap, and is mounted by moving the opening and the connecting end so as to approach each other in the axial direction. Thereby, the opening part of the sensor cap attached to the sensor housing does not expand due to an impact or the like, and can be prevented from falling off from the sensor housing. Therefore, since it is not necessary to increase the engagement force of the sensor cap with respect to the sensor housing, the rotation detection device can be easily manufactured.
Note that the “cylindrical opening” described above does not mean only those in which the opening is strictly connected in the circumferential direction. That is, in order to bend the opening and make it easy to attach the sensor cap to the sensor housing, it also includes an opening in which a slit is formed between adjacent protrusions or recesses on the circumference.

1 is an external perspective view showing a state in which the wheel speed sensor according to the first embodiment of the present invention is arranged close to the sensor rotor. In the wheel speed sensor shown in FIG. 1, the perspective view showing the state which removed the sensor cap from the sensor housing. Cross section of the wheel speed sensor when cut at the shaft center of the signal cable Sectional view showing the mold structure when forming the connection end of the sensor housing Part V enlarged view in FIG. VI-VI cross section in FIG. FIG. 1 is an external perspective view when the sensor cap shown in FIG. 1 is viewed from the side from which the signal cable is pulled out. Sectional view when the cable guide part of the sensor cap is cut perpendicular to the axial direction Plan view showing variations in the mounting direction of the sensor cap to the sensor housing External perspective view when the sensor cap according to the second embodiment is viewed from the side from which the signal cable is pulled out

<Embodiment 1>
A wheel speed sensor 1 according to Embodiment 1 of the present invention will be described with reference to FIGS. In the following description, the upper part in FIG. 3 is described as the upper part of the wheel speed sensor 1 and the lower part in FIG.
(Configuration of Embodiment 1)
The wheel speed sensor 1 is attached to the vehicle and detects the rotational speed of the wheel. The wheel speed sensor 1 corresponds to a rotation detection device. As shown in FIG. 3, the wheel speed sensor 1 includes a signal cable 2 connected to the sensor element 3 and a sensor covering portion 4 in which the sensor element 3 is built. The signal cable 2 corresponds to a signal line, and the configuration including the sensor element 3 and the sensor covering portion 4 corresponds to the sensor portion. Further, the wheel speed sensor 1 includes a sensor housing 5 integrally formed with the signal cable 2 and the sensor covering portion 4, and a sensor cap 6 attached to the upper end portion of the sensor housing 5.

As shown in FIG. 3, the sensor element 3 is formed by a detection body 31 and a plurality of lead frames 32 protruding from the detection body 31. The detection body 31 is not limited to this, but is formed by liquid-tightly sealing a detection circuit including a magnetoelectric conversion element such as a Hall IC with a molding resin material. The detection circuit may include a magnetoresistive element.
On the other hand, the signal cable 2 is formed by covering a pair of signal transmission lines 21 with an insulating member 22. Each signal transmission line 21 is formed by covering an electric wire 23 in which a plurality of core wires made of a conductive metal material are combined with an insulator 24. The insulator 24 is made of a molded resin material, and the pair of signal transmission lines 21 are insulated from each other. The electric wire 23 of the signal cable 2 is connected to any one of the lead frames 32 by welding or soldering.

  The sensor element 3 and the signal cable 2 are integrally molded with an epoxy resin in a state where both are connected, and the sensor covering portion 4 is formed. The sensor covering portion 4 integrally covers a portion of the sensor element 3 and the signal cable 2 that is connected to the sensor element 3. The sensor covering portion 4 completes waterproofing for the sensor element 3 and the signal cable 2. When the sensor element 3 and the signal cable 2 are covered, the sensor element 3 is held by a holding member (not shown) to prevent the displacement. On the outer peripheral surface of the sensor coating portion 4, a plurality of recesses 4 a that are traces of the above-described holding member at the time of molding are formed. The method for connecting the signal cable 2 and the sensor element 3 and the method for covering with the sensor covering portion 4 in the present embodiment are the same as the method described in Japanese Patent Application Laid-Open No. 2013-96749, which is an open patent publication.

  As shown in FIG. 3, the signal cable 2 includes a straight portion 2a, a curved portion 2b, and a lead portion 2c. The linear portion 2a is connected to the sensor element 3 in the sensor housing 5 and extends in the vertical direction. The curved portion 2 b is continuous with the straight portion 2 a and is bent at approximately 90 ° in the sensor cap 6. The lead-out part 2c is continuous with the curved part 2b and extends in a substantially horizontal direction and linearly toward the outside of the sensor cap 6.

The sensor housing 5 is integrally formed by injection molding using a thermoplastic molding resin material such as polybutylene terephthalate (PBT). The sensor housing 5 holds an upper portion of the sensor covering portion 4 and a portion connected to the sensor element 3 of the signal cable 2.
The sensor housing 5 has a sensor holding part 51 that holds the sensor covering part 4. As shown in FIG. 1, the sensor holding portion 51 is formed in a substantially cylindrical shape, and a plurality of attachment pieces 51 a protrude outward in the radial direction on the outer peripheral surface thereof. The attachment piece 51a is used for positioning when the wheel speed sensor 1 is attached to the vehicle.

  A flat mounting stay 52 is formed above the sensor holding portion 51. As shown in FIG. 3, a mounting hole 52 a passes through the mounting stay 52 in the thickness direction. A mounting collar 53 made of a metal material is fixed to the mounting hole 52a by insert molding. A mounting bolt (not shown) is inserted into the mounting collar 53 when the wheel speed sensor 1 is mounted on the vehicle. The upper end surface and the lower end surface of the mounting collar 53 mounted on the mounting stay 52 protrude from the upper and lower ends of the mounting stay 52, respectively, and the mounting collar 53 receives a tightening load when the mounting bolt is tightened. It is possible to be formed.

  The wheel speed sensor 1 is attached to a knuckle arm (not shown) or the like of the vehicle by a sensor housing 5. Thereby, the sensor coating | coated part 4 is arrange | positioned so that it may leave | separate only predetermined distance with respect to the sensor rotor RS which rotates integrally with a wheel (FIG. 1). The sensor rotor RS corresponds to a rotating member. When the sensor rotor RS rotates together with a wheel hub (not shown), a pulse signal having a frequency corresponding to the rotational speed of the sensor rotor RS is generated in the sensor element 3. The pulse signal corresponds to a rotation detection signal. A pulse signal generated in the sensor element 3 is transmitted via a signal cable 2 to an ABS control device (not shown) of the vehicle. The ABS control device detects the wheel speed based on the transmitted pulse signal.

  As shown in FIG. 2, the sensor housing 5 is formed with a connection end 54 so as to be positioned at one end (upper end) from which the signal cable 2 is drawn. A cable hole 54a through which the signal cable 2 passes is provided at the center of the connection end 54 in the radial direction, and the connection end 54 has a substantially cylindrical shape. From the outer peripheral surface 54b of the connection end 54, four engagement holes 54c penetrate in the radial direction so as to reach the cable hole 54a. The outer peripheral surface 54b corresponds to a side surface. Further, the engagement hole 54c corresponds to one of the plurality of convex portions and the plurality of concave portions and the attachment hole. The engagement hole 54c has a rectangular cross-sectional shape (shown in FIG. 2), but is not limited thereto. The engagement holes 54c are provided so as to be arranged at equal intervals on the circumference so that the axes of adjacent ones on the outer peripheral surface 54b form 90 ° (shown in FIG. 4).

  As shown in FIG. 4, when the sensor housing 5 is molded, the molding die 7 is arranged so that the signal cable 2 to which the sensor element 3 and the sensor covering portion 4 are attached is positioned at the center in the radial direction. Four insert pins 71 are inserted into the mold 7 from the outside in the radial direction. The insert pin 71 corresponds to a retainer pin. The insert pins 71 pass through the molding die 7 so that the axes of adjacent ones form an angle of 90 °, and enter the cavity 72 of the molding die 7. At the time of molding the sensor housing 5, the tip of each insert pin 71 is in contact with the outer peripheral surface of the signal cable 2 to hold the signal cable 2, and the movement of the signal cable 2 due to the inflow of molten resin material (in FIG. 4) (Movement in the vertical and horizontal directions) is suppressed. By forming the sensor housing 5, a connection end 54 is formed in the cavity 72, and an engagement hole 54 c provided in the connection end 54 is formed as a trace of the insert pin 71.

  As shown in FIGS. 1 and 2, the sensor cap 6 is attached to the connection end portion 54 of the sensor housing 5, and the signal cable 2 drawn out from the sensor housing 5 is accommodated in the sensor cap 6. The extending direction of 2 is changed. In the vehicle, when the signal cable 2 is used while being pulled out from the sensor housing 5, the sensor cap 6 may not be attached. The sensor cap 6 is integrally formed using a molded resin material, and has a mounting portion 61 that extends in the axial direction (vertical direction) of an opening 61a described later. The sensor cap 6 is connected to the attachment portion 61 and extends in a direction that forms a predetermined angle θ (shown in FIG. 3) with respect to the direction in which the attachment portion 61 extends to bend the signal cable 2. A cable guide 62 is provided. The cable guide part 62 corresponds to a direction changing part. In the present embodiment, θ is set to 90 °.

As shown in FIGS. 5 and 6, the attachment portion 61 has a substantially cylindrical opening 61 a at one end attached to the connection end portion 54. Four engaging protrusions 61c protruding inward in the radial direction are provided on the inner peripheral surface 61b of the opening 61a so as to be arranged on the circumference. The engaging protrusion 61c corresponds to the other of the plurality of convex portions and the plurality of concave portions. A snap fit structure is formed by the engagement hole 54c provided in the connection end 54 and the engagement protrusion 61c provided in the opening 61a. On the inner peripheral surface 61b of the opening 61a, the engagement protrusions 61c are provided at equal intervals on the circumference so that adjacent ones form an angle of 90 °. Further, a taper portion 61d is formed in the lower portion of each engaging protrusion 61c (shown in FIG. 5).
As shown in FIG. 7, the opening 61a is formed with a plurality of flexible slits 61e so as to be positioned at both ends in the circumferential direction of the respective engaging projections 61c. Each flexible slit 61e extends in the axial direction (upward) from the opening 61a. A portion of the opening 61a where the engagement protrusion 61c is formed is formed by the flexible slit 61e so as to be able to bend in the radial direction.

  On the other hand, the cable guide portion 62 has a lead-out hole 62a into which the signal cable 2 is fitted (shown in FIG. 7). The cable guide part 62 curves the signal cable 2 by accommodating the signal cable 2 in the lead-out hole 62a, and changes its extending direction. The mounting portion 61 and the cable guide portion 62 described above have a continuous window portion 6b that extends in the direction in which the mounting portion 61 and the cable guide portion 62 extend on the outer peripheral surface. However, the window 6b is not formed to extend to the opening 61a. As shown in FIG. 8, in the sensor cap 6, a part of the outer peripheral surface of the signal cable 2 accommodated therein is exposed from the window portion 6b. On the periphery of the window portion 6b, the inner end portion 62b located on the drawing hole 62a side is formed at a pin angle without chamfering. On the other hand, the outer end 62c located on the outer peripheral surface side of the cable guide 62 at the periphery of the window 6b is formed in a curved surface shape.

(Procedure for mounting the sensor cap to the sensor housing)
Hereinafter, a procedure for mounting the sensor cap 6 to the connection end portion 54 of the sensor housing 5 will be described. First, the signal cable 2 drawn out from the sensor housing 5 is inserted into the sensor cap 6 through the opening 61a. At this time, a finger or the like is inserted into the window portion 6 a of the sensor cap 6, and the signal cable 2 is bent so as to be received in the extraction hole 62 a of the sensor cap 6. Next, the connection end 54 of the sensor housing 5 and the opening 61a of the sensor cap 6 are moved so as to approach the axial direction (vertical direction in FIG. 2). In this state, the circumferential positions of the engagement hole 54c of the connection end 54 and the engagement protrusion 61c of the opening 61a are aligned, and the inner peripheral surface 61b of the opening 61a is aligned with the outer peripheral surface 54b of the connection end 54. To fit. As the opening 61a is fitted into the outer peripheral surface 54b of the connection end 54, the tapered portion 61d of the engagement protrusion 61c rides on the outer peripheral surface 54b of the connection end 54, and the engagement protrusion 61c in the opening 61a. The portion where the is formed bends radially outward. When the fitting of the opening 61a to the connecting end 54 further proceeds, the portion of the opening 61a that has been bent outward in the radial direction returns to the original state. Thereby, each engagement protrusion 61c engages with one of the engagement holes 54c of the connection end 54, and the mounting of the sensor cap 6 to the sensor housing 5 is completed (shown in FIGS. 5 and 6). After the engagement protrusion 61c and the engagement hole 54c are engaged, the upper end of the engagement protrusion 61c is in contact with the inner wall of the upper end of the engagement hole 54c. 61c does not easily fall out of the engagement hole 54c.

  When the sensor housing 5 is mounted, the sensor cap 6 is rotated clockwise or counterclockwise in FIG. 9 around the mounting portion 61, and the engagement protrusion 61c and the engagement hole 54c are engaged with each other. Can be changed. Accordingly, the direction of the cable guide portion 62 of the sensor cap 6 can be changed, and the extending direction of the signal cable 2 drawn from the sensor housing 5 can be changed at intervals of 90 ° (in FIG. 9, each position is changed). P, Q, R, S).

(Effect of Embodiment 1)
According to this embodiment, the connection end 54 is provided at one end of the sensor housing 5, and the opening 61 a is formed at one end of the sensor cap 6. The sensor cap 6 is attached to the sensor housing 5 by fitting the opening 61 a to the outer peripheral surface 54 b of the connection end 54. Thereby, the extending direction of the signal cable 2 drawn out from the sensor housing 5 can be changed only by attaching the sensor cap 6 to the sensor housing 5. Therefore, in the sensor housing 5, the wheel speed sensor 1 that can correspond to any mounting specification in the vehicle can be obtained only by forming a shape that pulls out the signal cable 2 in one direction.
The opening 61a is formed in a cylindrical shape at one end of the sensor cap 6, and moves the opening 61a of the sensor cap 6 and the connection end 54 of the sensor housing 5 so as to approach each other in the axial direction. Wearing. Thereby, the opening part 61a of the sensor cap 6 attached to the sensor housing 5 does not expand due to an impact, and the drop-off from the sensor housing 5 can be prevented. Therefore, since it is not necessary to increase the engagement force of the sensor cap 6 with respect to the sensor housing 5, the wheel speed sensor 1 can be easily manufactured.

The sensor cap 6 includes a mounting portion 61 having an opening 61 a at one end, and a cable guide portion 62 extending in a direction that forms a predetermined angle θ with respect to the direction in which the mounting portion 61 extends. . And the attaching part 61 and the cable guide part 62 have the continuous window part 6a extended in the direction where the attaching part 61 and the cable guide part 62 are extended in an outer peripheral surface. Thereby, when the sensor cap 6 is mounted on the sensor housing 5, a finger or the like can be inserted into the window portion 6 a and the signal cable 2 can be pressed so as to be received in the lead-out hole 62 a of the sensor cap 6. Therefore, the assembly property of the wheel speed sensor 1 can be improved.
Further, on the periphery of the window 6a, an inner end 62b, which is an end located on the drawing hole 62a side, is formed at a pin angle without chamfering. Thereby, after being attached to the vehicle, the signal cable 2 accommodated in the lead-out hole 62a can be prevented from easily falling off from the lead-out hole 62a.
On the other hand, an outer end 62c, which is an end located on the outer peripheral surface side of the cable guide 62, is formed in a curved surface at the periphery of the window 6a. Thereby, when attaching the sensor cap 6 to the sensor housing 5, the signal cable 2 can be easily accommodated in the lead-out hole 62a.

A plurality of engagement holes 54c formed in the connection end 54 and engaged with the engagement protrusions 61c provided in the sensor cap 6 are arranged in the forming die 7 when the sensor housing 5 is formed, and the signal cable 2 It is formed as a trace of the retainer pin 71 that holds the. Thereby, the signal cable 2 can be held and the engagement hole 54c can be formed simultaneously in the same space when the sensor housing 5 is molded. Therefore, the sensor housing 5 can be reduced in size, the manufacturing process can be simplified, and the wheel speed sensor 1 can be easily manufactured.
A plurality of engagement holes 54c provided in the sensor housing 5 and a plurality of engagement protrusions 61c provided in the sensor cap 6 are respectively formed on the outer peripheral surface 54b of the connection end 54 and the inner peripheral surface 61b of the opening 61a. It is provided at equal intervals on the circumference. As a result, when the sensor cap 6 is attached to the sensor housing 5, the combination of the engaging protrusions 61 c and the engaging holes 54 c that are engaged with each other can be changed, and the signal cable 2 drawn from the sensor housing 5 can be extended. The current direction can be changed by a predetermined angle.
The engaging protrusion 61c and the engaging hole 54c form a snap-fit structure that engages with each other when the inner peripheral surface 61b of the opening 61a is bent outward in the radial direction. Thereby, the engagement load at the time of attaching the sensor cap 6 to the sensor housing 5 can be reduced, and the assembly property of the wheel speed sensor 1 can be improved. Further, when the mounting of the sensor cap 6 to the sensor housing 5 is completed, the opening 61a is restored, and the engagement protrusion 61c engages with the engagement hole 54c. Therefore, the sensor cap 6 is removed from the sensor housing 5. Can be prevented.

<Embodiment 2>
(Configuration of Embodiment 2)
Based on FIG. 10, the sensor cap 6A of the wheel speed sensor 1 according to Embodiment 2 of the present invention will be described. Similarly to the sensor cap 6 according to the first embodiment, the sensor cap 6A according to the present embodiment is connected to the mounting portion 63 attached to the sensor housing 5 and the mounting portion 63, and accommodates and curves the signal cable 2. Cable guide portion 64. The cable guide portion 64 corresponds to a direction changing portion. The attachment portion 63 has an opening 63a at one end attached to the connection end portion 54, and four engagement protrusions (not shown) each having a tapered portion on the inner peripheral surface of the opening 63a. ) Is provided. Furthermore, a plurality of flexible slits 63e are formed in the opening 63a so as to be positioned at both ends in the circumferential direction of adjacent engaging protrusions.

  On the other hand, the sensor cap 6A according to the present embodiment is different from the sensor cap 6 according to the first embodiment in that the window portion 6a is not formed in the attachment portion 63 and the cable guide portion 64. As shown in FIG. 10, the lead-out hole 64 a formed in the cable guide portion 64 is closed in a circumferential shape, and the attachment portion 63 and the cable guide portion 64 cover the entire circumference of the signal cable 2. ing.

(Effect of Embodiment 2)
According to the present embodiment, the attachment portion 63 and the cable guide portion 64 cover the entire circumference of the signal cable 2. Thereby, after being attached to the vehicle, the signal cable 2 can be prevented from falling off the sensor cap 6A.

<Other embodiments>
The present invention is not limited to the above-described embodiments, and can be modified or expanded as follows.
The engagement protrusion 61 c may be formed on the outer peripheral surface 54 b of the connection end 54, and the engagement hole 54 c may be formed in the opening 61 a of the sensor cap 6. In addition, the engaging protrusion 61c and the engaging hole 54c may be mixed in the connecting end 54 and the opening 61a.
Further, the adjacent engagement protrusions 61c and the adjacent engagement holes 54c may be arranged at an interval of an angle smaller than 90 °. Thereby, it becomes possible to change the lead-out direction of the signal cable 2 in increments of less than 90 °.
Further, any number of the engagement protrusions 61 c and the engagement holes 54 c may be formed on the circumferences of the opening 61 a and the connection end 54.
In the sensor cap 6, the angle θ formed by the attachment portion 61 and the cable guide portion 62 does not necessarily have to be 90 °, and can be set to an arbitrary angle according to the attachment specification in the vehicle. Is possible.
Further, the connection end 54 and the opening 61a do not have to be cylindrical, but may be elliptical, quadrangular, polygonal, or the like.
In addition, the rotation detection device according to the present invention is applicable not only for being mounted on a vehicle but also for detecting the rotation state of a rotating member such as a home appliance or an industrial machine.
The rotation detection device according to the present invention is not limited to a device that detects the rotation speed, but may be a device that detects the rotation speed, rotation acceleration, rotation deceleration, rotation angle, and the like of the rotating member.

  In the drawings, 1 is a wheel speed sensor (rotation detection device), 2 is a signal cable (signal line), 3 is a sensor element (sensor part), 4 is a sensor covering part (sensor part), 5 is a sensor housing, and 6A. Is a sensor cap, 6a is a window, 7 is a molding die, 54 is a connection end, 54a is a cable hole, 54b is an outer peripheral surface (side surface), 54c is an engagement hole (recess, mounting hole), and 61 and 63 are attachments. , 61a and 63a are openings, 61b is an inner peripheral surface of the opening, 61c is an engaging protrusion (convex portion), 62 and 64 are cable guide portions (direction changing portions), 71 is an insert pin (retainer pin), RS represents a sensor rotor (rotating member), and θ represents a predetermined angle.

Claims (6)

Sensor units (3, 4) for generating a rotation detection signal based on the rotation state of the rotation member (RS);
A signal line (2) connected to the sensor unit and transmitting the rotation detection signal;
While holding at least a part of each of the sensor unit and the signal line, a cylindrical connection end (54) through which the signal line penetrates the inside is provided at one end, and the signal line extends from the connection end. A sensor housing (5) from which
The one end portion has a cylindrical opening (61a, 63a) attached to the side surface (54b) of the connection end portion, and the signal line drawn out from the sensor housing is accommodated therein, thereby A sensor cap (6, 6A) that changes the extending direction of the line;
A rotation detection device (1) comprising:
In a state where the opening and the connection end are moved so as to approach in the axial direction, an inner peripheral surface (61b) of the opening is fitted to the side surface of the connection end, and The sensor cap is attached to the sensor housing by the engagement of the convex portion (61c) and the concave portion (54c) formed on the side surface of the connection end portion and the inner peripheral surface of the opening portion. Rotation detection device. The sensor cap is
A mounting portion (61) having the opening (61a) at one end and extending in the axial direction of the opening;
A direction changing portion (62) coupled to the mounting portion and extending in a direction forming a predetermined angle (θ) with respect to a direction in which the mounting portion extends, and curving the signal line;
Have
The mounting portion and the direction changing portion are
The rotation detecting device according to claim 1, further comprising a continuous window portion (6a) extending in a direction in which the attachment portion and the direction changing portion extend on an outer peripheral surface. The sensor cap (6A)
An attachment portion (63) having the opening (63a) at one end and extending in the axial direction of the opening;
A direction changing portion (64) coupled to the mounting portion and extending in a direction forming a predetermined angle (θ) with respect to a direction in which the mounting portion extends, and curving the signal line;
Have
The mounting portion and the direction changing portion are
The rotation detection device according to claim 1, wherein the rotation detection device covers the entire circumference of the signal line. The connection end is
A cable hole (54a) for accommodating the signal line;
As the concave portion that penetrates in the radial direction so as to reach the cable hole from the side surface and engages with the convex portion provided in the sensor cap when the sensor cap is mounted on the sensor housing. A plurality of mounting holes (54c);
It has
Each of the mounting holes is
The rotation detection device according to any one of claims 1 to 3, wherein the rotation detection device is formed by a retainer pin (71) that is disposed in a mold (7) and holds the signal line when the sensor housing is molded. .   One or both of the plurality of convex portions and the plurality of concave portions are provided at equal intervals on the side surface of the connection end portion, and among the plurality of convex portions and the plurality of concave portions, The rotation detection device according to any one of claims 1 to 4, wherein the other or both are provided at equal intervals on the circumference of the inner peripheral surface of the opening.   The convex portion and the concave portion form a snap-fit structure in which at least one of the side surface of the connection end portion and the inner peripheral surface of the opening portion is engaged with each other by bending in the radial direction. The rotation detection device according to any one of claims 1 to 5.

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