JP2001174471A - Rotation detecting sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a possibility that a fixing member (bolt) C for a rotation detecting sensor P falls and is lost. SOLUTION: In this rotation detecting sensor P to convert magnetic-field variations due to the rotation of a body to be detected into electric signals and output them, a detecting part (a) is passed through a mounting member A and opposed to the rotating body to be detected, and a fixing piece 29 protruded to the side is brought into contact with the mounting member A and fixed. A bolt C is freely rotatably inserted into the fixing piece 29 via a bush 30 and prevented from coming off by an E-ring 33. The bolt C in this state is screwed, mounted, and fixed to the mounting member A of a motor vehicle. Since the bolt C is integrated with the rotation detecting sensor P at this time, there is no possibility that the bolt C falls or is lost to smooth the mounting operation. By providing a counterbore 42 for a screw hole 41, the E-ring 33 is prevented from obstructing fastening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation detection sensor such as an automobile wheel speed sensor and an engine speed sensor.

[0002]

2. Description of the Related Art For example, as shown in FIGS. 5 and 6, a wheel speed sensor has a detecting portion a penetrating a mounting member A so as to be opposed to a rotating object B, and has a laterally protruding fixed portion. The piece 9 is applied to the mounting member A and tightened by a bolt C to be mounted and fixed to the mounting member A. At this time, the bush 10 of the fixing piece 9 is usually made of metal, and serves to receive the fastening force of the bolt C.

[0003] A ferromagnetic pulsar ring having gear-shaped teeth provided on the periphery thereof or a S-pole and an N-pole are alternately and continuously appearing on the surface of the detection object B in the circumferential direction. A magnetized pulsar ring is used, and the detection unit a is provided with a magnetic detection IC chip 2 and a control electronic component (circuit unit) 3 on a substrate 1 as shown in FIG. The substrate 1 and the magnet 4 are held by a resin holder 6, and the resin holder 6 is housed in a case 5 (Japanese Patent Application Laid-Open Nos. 5-302933 and 7-198736), or a coil. A configuration in which a pole piece is provided inside a bobbin for winding and holding the magnet and a magnet is provided on the rear side of the pole piece (an electromagnetic pickup). (Japanese Patent Laid-Open No. 10-
No. 260194). The detection unit a is directly connected to the output line 8 via the relay terminal 7 or to the output line 8 via the connector.

[0004]

Regardless of the configuration of the wheel speed sensor P of the detecting section a, the bolt C is a separate component when the fixing piece 9 is bolted and fixed.
While inserting the bolt C through the hole 9a of the fixing piece 9, the screw hole 4
Must be screwed into 1. At this time, the wheel speed sensor P is generally mounted around the foot where a number of related parts such as axles, wheels, suspensions, brakes, etc. are mounted, and it is difficult to work because a sufficient working space cannot be secured. Bolts C are easily dropped or lost during work.

[0005] It is an object of the present invention to improve the workability of the sensor mounting operation and to prevent the fixing tool such as the bolt C from dropping or being lost.

[0006]

In order to achieve the above object, in the present invention, the fixing member such as the bolt is integrated with the fixing piece. If the fixing member is integrated with the rotation detection sensor, there is no possibility that the fixing member is dropped or lost, and the mounting operation is smooth.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is as follows.
The detector is passed through the mounting member to face the rotating object to be detected, and a fixing piece protruding laterally is applied to the mounting member and fixed, and the magnetic field fluctuation due to the rotation of the object is converted into an electric signal. In the rotation detecting sensor, the bolt is screwed into the screw hole of the mounting member and penetrates through the fixing piece to project toward the mounting member, and the bolt is rotatable with respect to the fixing piece. A structure is adopted that is inserted into and is prevented from falling off and integrated.

[0008] As means for preventing the bolt from coming off integrally, the bolt forms a body (small diameter part) having a diameter smaller than the thread between the head and the threaded part, and a bush is provided with a bolt on the body. A structure in which the bolt is penetrated and fixed to the fixing piece via the bush is adopted so that it is rotatable and integrated so as to be integrated, or an E-ring or the like is fitted to the bolt after the bolt penetrates the fixing piece. A configuration such as stopping is adopted.

In another embodiment, instead of the bolt, a projecting shaft integrally fixed to a fixing piece having irregularities on the outer surface is used.
A configuration in which the protruding shaft is fixed to the mounting member by deformation of the concavo-convex by fitting the protruding shaft into the locking hole of the inner surface of the mounting member may be employed.

The protruding shaft may be integrated by inserting a bolt when the fixed piece is molded with a resin, or the protruding shaft itself may be integrally molded.

[0011]

FIG. 1 shows an embodiment of the present invention. A wheel speed sensor P of this embodiment is of an electromagnetic pickup type, and has a pole piece 22, a magnet 23, and a yoke 24 in the axial direction inside a bobbin 21. A coil 25 is wound around the bobbin 21 corresponding to the pole piece 22. The end of the coil 25 is connected to the relay terminal 26, and the relay terminal 26 and the bobbin 21 are connected to the resin sealing material 2 by insert molding.
7 buried and held. The resin sealing material 27 forms an outer shell of the wheel speed sensor P, and a connector portion 28 is formed at one end thereof. An external output line is connected to the connector portion 28 via a connector. Relay terminal 2
6. It is sent to a controller or the like via an output line.

A fixing piece 29 is integrally formed on the side of the resin sealing material (outer shell) 27, and a bolt 31 is provided on the fixing piece 29 via a bush 30. The bolt 31 has a body portion 31 having a smaller diameter between the head and the threaded portion than the thread.
The bush 30 is fitted in the body 31a. The bush 30 is in the form of a metal split ring or the same split ring, is fitted in the body 31a with the split, and is integrated by inserting the bolt 31 with the bush 30 simultaneously with the formation of the fixing piece 29. I have. At this time, if the bush 30 is an elastic material, the bush 30 can be expanded in diameter and fitted to the bolt 31 and subsequently reduced in diameter to prevent the bush 30 from being separated from the bolt 31, but if this is not possible, caulking after fitting, etc. Means prevent disengagement. Alternatively, the bush 30 may be stopped, and the fixing piece 29 may be a metal piece. At this time, this fixing piece 29 is inserted at the time of outer molding.

The wheel speed sensor P is connected to a vehicle-side mounting member A.
As shown in FIG. 2, the detector a is passed through the mounting hole 40 of the mounting member A, and the bolt 31 is screwed into the screw hole 41 to be fastened and fixed. At this time,
Since the bolt 31 is integrated with the wheel speed sensor P, there is no loss due to falling off or the like.

As means for integrating the bolt 31 with the wheel speed sensor P, as shown in FIG.
May be inserted into the hole 29a of the fixing piece 29, and then a stopper 33 such as an E-ring may be fitted. At this time, it is preferable to form a counterbore 42 in the screw hole 41 so that the stopper 33 is inserted into the screw hole 41 so as not to hinder the fastening.

As a means other than the fastening, it is conceivable to use a killing method. As one of the means, as shown in FIG. 4, a protruding shaft 35 having annular protruding lines 34 arranged on the outer periphery is integrally formed with the fixing piece 29, and this protruding shaft 35 is press-fitted into the locking hole 41 to form a circular protruding portion. The wheel speed sensor P can be fixed by engagement (engagement) with a thread due to deformation and cutting of the ridge 34. The annular protrusion 34 of the protruding shaft 35 may have any shape as long as it engages with irregularities in the engagement hole 41, and for example, the same screw shape (spiral protrusion), emboss shape, or the like is adopted. On the other hand, the locking hole 41 is not limited to the screw, but may be any irregularities that can be locked.

In this embodiment, the wheel speed sensor P is used. However, the rotation detection sensor according to the present invention can of course be used for detecting various rotations such as the engine speed. Further, the present invention can of course be applied to various types of rotation detection sensors P such as the detection unit a shown in FIG.

[0017]

As described above, according to the present invention, the fixing member such as a bolt is integrally provided on the rotation detecting sensor, so that the fixing member is not lost and the mounting operation is smooth.

[Brief description of the drawings]

FIG. 1 is a partially cut front view of an embodiment before installation.

FIG. 2 is a partially cut front view of the embodiment after installation.

FIG. 3 is a partially cut front view of another embodiment before installation.

FIG. 4 is a partially cut front view of another embodiment before installation.

FIG. 5 is a perspective view of a conventional example.

FIG. 6 is a partially cut front view after the attachment.

[Explanation of symbols]

 Reference Signs List A mounting member B object to be detected C, 31 fixing member (bolt) P rotation detection sensor (wheel speed sensor) a detection unit 1 substrate 2 magnetic detection IC chip 3 control electronic component (circuit unit) 4, 23 magnet 5 case Reference Signs List 6 resin holder 7, 26 relay terminal 8 output wire 9, 29 fixing piece 9a, 29a hole of fixing piece 10, 30 bush 21 bobbin 22 pole piece 24 yoke 25 coil 27 resin sealing material 28 connector 31a body (small diameter) Part) 33 stopper (E-ring) 34 annular protrusion (irregularity) 35 protrusion shaft (fixing member) 40 mounting hole 41 locking hole (screw hole) 42 counterbore

Claims (4)

[Claims] 1. A detection member a is passed through a mounting member A to face a rotating detection target B, and a fixing piece 29 protruding laterally is applied to the mounting member A and fixed. A rotation detecting sensor P that converts a magnetic field variation due to rotation of B into an electric signal and outputs the electric signal, wherein the fixing members C and 31 are fitted into and fixed to the locking holes 41 of the mounting member A in the fixing pieces 29. , 35 to the mounting member A
A rotation detection sensor, which is integrally provided so as to protrude toward the rotation direction. 2. The fixing member according to claim 1, wherein the fixing member is a bolt, the locking hole is a screw hole, and the bolt is screwed into the screw hole. A rotation detection sensor, which is rotatably inserted and prevented from falling off and integrated. 3. The bolt according to claim 2, wherein:
A body 31a having a smaller diameter than the thread is formed between the head and the threaded portion, and a bush 30 is non-removably fitted to the body 31a such that the bolt 31 is rotatable and integrated. A rotation detecting sensor, wherein a bolt 31 is fixedly penetrated to the fixing piece 29 via a bolt. 4. The fixing member according to claim 1, wherein the fixing member is an integrally-fixed protruding shaft having an uneven surface on its outer surface, and the protruding shaft is fitted into a locking hole of the inner surface of the mounting member. The protrusions 35 are fixed to the mounting member A by deformation of the irregularities 34 due to the rotation detection sensor.