JPH0862232A - Speed sensor and its assembly method - Google Patents

Abstract

PURPOSE: To simplify operation, improve the workability, and at the same time, obtain a favorable rotation of an input rotation shaft. CONSTITUTION: The speed sensor is journaled freely rotatably on a bearing 2 which is fixed to a housing 101, a magnet 104 for detecting rotation is mounted to a tip part 31, a rear-edge part is connected to a rotation transfer shaft 201 via an interlocking means 4, and the sensor is provided with an input rotation shaft 3 where braking force is given by a magnet 120 for braking which is attracted and fixed to the bearing 2. The bearing 2, the magnet 104 for detecting rotation, the magnet 120 for braking, the interlocking means 4, and the input rotation shaft 3 are assembled in one piece as a sub assembly 5. Also, a press-fit part 22 of the bearing 2 is provided with a push-in part 22a which extends in the diameter direction more than the magnet 104 for detecting rotation and the magnet 120 for braking.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed sensor which is mounted on a transmission of an automobile, converts the rotation of the transmission into an electric signal and outputs the electric signal to an indicating instrument, and a method for assembling the speed sensor.

[0002]

2. Description of the Related Art Conventionally, as a speed sensor mounted on an automobile, rotation of an automobile transmission is transmitted to a magnet arranged in a housing, and a change in magnetic field due to this rotation is converted into an electric signal by a magnetoelectric conversion element. ,
A semiconductor type speed sensor that outputs this electric signal to a speedometer is often used.

FIG. 5 shows a speed sensor 100 disclosed in Japanese Utility Model Laid-Open No. 5-27678 as such a conventional speed sensor.

The speed sensor 100 is rotatably supported by a bearing 102 in a housing 101 that is connected to the transmission 200 from the outside, and a rotation detecting magnet 104 whose rotation is detected by a magnetoelectric conversion element 103 is attached to a tip end portion thereof. At the same time, the rear end portion is connected to the rotation transmission shaft 201 for extracting the rotation of the transmission 200 by the flexible connecting means 105, and the bearing 102 is also provided.
The input rotating shaft 106 is provided with braking by the braking magnet 120 that is attracted and fixed to the input rotating shaft 106.

The housing 101 has an open end 101 on one end side.
b is closed by an end cap 110, and the other end side is a mounting recess 107 in which a female screw portion 107a is formed on the inner peripheral surface.
Is formed of a cylindrical member having an open end, and the bearing 102 is press-fitted from the open end 101b on one end side into the step portion 101a in the housing 101 so as to be fixed in the housing 101. ing.

The input rotary shaft 106 has a small-diameter shaft portion 106a formed at the front end portion, a large-diameter shaft portion 106b formed continuously with the small-diameter shaft portion 106a at the rear end side, and the large-diameter shaft portion 1
It has a flange portion 106c formed along the outer periphery of the substantially central portion of 06b, and is formed as a metal stepped shaft. Further, the large-diameter shaft portion 106b of the input rotary shaft 106 has a non-circular engagement hole 10 that opens at the rear end along the shaft center portion.
6d is drilled. Then, the input rotary shaft 106
The small-diameter shaft portion 106a is inserted into the bearing 102 from the side of the mounting recess 107, and the flange portion 106c is brought into contact with the end surface of the bearing 102 on the side of the mounting recess 107, so that the large-diameter shaft portion 106b is rotated. It is rotatably supported by and is mounted in the housing 101.

The braking magnet 120 is formed in a ring shape, and the housing 1 is opened from the one end side open end 101b.
01, the step portion 10 of the bearing 102 in 101
It is adsorbed and fixed to 2a.

The rotation detecting magnet 104 is inserted into the housing 101 from the one end side open end 101b, and is attached to the housing 101.
The small-diameter shaft portion 106a of No. 6 is attached by caulking the tip of the small-diameter shaft portion 106a with a jig.
The rotation detecting magnet 104 is provided with a sliding washer 121.
Also, the thrust washer 122 is attached to the small diameter shaft portion 106a of the input rotary shaft 106 with the thrust washer 122 interposed between the thrust washer 122 and the braking magnet 120 by the sliding washer 122. The braking magnet 120 is managed so that the braking magnet 120 does not bind and the braking force of the braking magnet 120 acts appropriately. At this time, the sliding washer 121 and the thrust washer 122 are inserted into the housing 101 from the open end 101b on one end side, and are assembled to the input rotary shaft 106 together with the rotation detecting magnet 104. The magnetoelectric conversion element 103 that detects the rotation of the rotation detecting magnet 104 is provided in the circuit portion 108 attached to the end cap 110 side so as to face the rotation detecting magnet 104.

Further, the input rotating shaft 106 is provided with connecting means 105 for connecting to the rotation transmitting shaft 201 for taking out the rotation of the transmission 200.

The connecting means 105 includes a flexible shaft portion 105a having flexibility and the flexible shaft 105.
The engaging hole 10 of the input rotary shaft 106 formed on one end side of a
Engaging shaft portion 105b having a non-circular cross section corresponding to the hole shape of 6d
And a connecting portion 105c formed with a key 105e for connecting to the rotation transmitting shaft 201 connected to the other end of the flexible shaft portion 105a and made of a metal material. Is inserted into the engaging hole 106d of the input rotary shaft 106, and the retaining bush 10
9 is attached to the input rotary shaft 106 by interlocking the input rotary shaft 106 and the flexible shaft portion 105a to prevent them from coming off.

The speed sensor 1 assembled in this way
00 is the key 105 in the key groove 201b of the rotation transmission shaft 201 that rotates in synchronization with the rotation of the transmission 200.
The connecting portion 105c is inserted into the shaft hole 201a of the rotation transmitting shaft 201 so that the mounting recess 10
The sleeve 2 provided on the transmission 200 side with the female screw 107a of No. 7 disposed inside the rotation transmission shaft 201
It is attached by screwing it with the male screw 202a of No. 02.

The speed sensor 100 transmits the rotation of the rotation transmission shaft 201 that rotates in synchronization with the rotation of the transmission 200 to the input rotation shaft 106 via the connecting means 105. 106
The change in the magnetic field of the rotation detecting magnet 104 due to the rotation of the magnet is detected by the magnetoelectric conversion element 103, and the electric signal thereof is connected to the terminal 13 for connecting the circuit unit 108 and an indicator (not shown).
When it is 0, it is output to the indicating instrument and a predetermined speed is displayed.

[0013]

However, in the speed sensor 100, the housing 102 is provided with the bearing 102, the braking magnet 120 and the bearing 102 from the open end 101b.
The sliding washer 121, the thrust washer 122, and the rotation detection magnet 104 are inserted, and the housing 1
Since the assembly is performed by inserting the input rotary shaft 106 to which the coupling means 105 is attached from the attachment recess 107 on the other end side of 01, the inserting directions of the parts are opposite to each other, and the assembling work procedure becomes complicated. Has the problem.

Further, in the speed sensor 100, the connecting means 105 is formed separately from the input rotary shaft 106, and the engaging shaft portion 105b thereof is simply the engaging hole 10 of the input rotary shaft 106.
Since it is assembled into the 6d without any slip-out prevention, the slip-out prevention bush 109 is required.
Due to the increase in the number of parts and the man-hours for assembling, there is a problem that the assembling workability is poor and the cost is high.

Further, in the speed sensor 100, since the input rotary shaft 106 is made of metal such as free-cutting steel, the rotatability with respect to the bearing 102 is poor, leading to a decrease in sensor performance and an increase in weight. The rotation detecting magnet 10 by crimping the tip end surface of the input rotating shaft 106.
There is also a possibility that the rotation detecting magnet 104 may be damaged by mechanical stress when the No. 4 is attached, and there is a problem that the assembling workability is poor.

The present invention has been made to solve the above-mentioned problems, and the purpose thereof is to simplify the assembling work and improve the workability thereof, and at the same time, improve the rotatability of the input rotary shaft. To provide a speed sensor and an assembling method thereof.

[0017]

In order to achieve the above-mentioned object, the invention as claimed in claim 1 is such that a middle portion is rotatably supported by a bearing which is press-fitted and fixed in a housing which is externally connected to a transmission. Then, a rotation detecting magnet for detecting rotation by a magnetoelectric conversion element is attached to the front end portion, the rear end portion is connected to a rotation transmission shaft for extracting the rotation of the transmission through a connecting means, and is fixed to the bearing by suction. In a speed sensor having an input rotary shaft to which a braking force is applied by a braking magnet, the bearing, the rotation detecting magnet, the braking magnet connecting means, and the input rotary shaft are integrally assembled to form a sub-assembly. , Push-in of the press-fitting part of the bearing protruding in the radial direction from the rotation detecting magnet and the braking magnet It is characterized by being formed with a.

According to a second aspect of the invention, there is provided the speed sensor according to the first aspect, wherein the pushing portion is a press-fitting portion of the bearing having a larger diameter than the rotation detecting magnet and the braking magnet. It is characterized by a large diameter portion.

A third aspect of the present invention is the speed sensor according to the first aspect, wherein the pushing portion is press-fitted into a press-fitting groove axially formed in the inner wall of the housing. It is characterized in that it is a ridge formed to project in the axial direction outside the press-fitting portion.

A fourth aspect of the present invention is the speed sensor according to any one of the first to third aspects, wherein the input rotary shaft is made of synthetic resin and is formed integrally with the continuous means. It is characterized by being.

According to a fifth aspect of the invention, an intermediate portion is rotatably supported by a bearing which is press-fitted and fixed in a housing which is externally connected to the transmission, and a rotation is detected at a tip portion by a magnetoelectric conversion element. A rotation detecting magnet is attached, the rear end portion is connected to a rotation transmission shaft for extracting the rotation of the transmission through a connecting means, and a braking force is applied by a braking magnet attracted and fixed to the bearing. In a method of assembling a speed sensor having a shaft, the bearing, the rotation detecting magnet, the braking magnet, the connecting means, and the input rotating shaft are integrally assembled to form a sub-assembly,
The press-fitting part of the bearing into the housing is formed to have a pressing part that protrudes in the radial direction from the rotation detecting magnet and the braking magnet, and the press-fitting jig abuts against the pressing part. Then, the subassembly is press-fitted into the housing.

Further, the invention according to claim 6 is the same as claim 5.
The method for assembling a speed sensor as described above, characterized in that the input rotary shaft is formed of synthetic resin and is formed integrally with the connecting means.

[0023]

Since the invention according to claims 1 to 6 has the above-mentioned structure, it has the following effect.

That is, according to the first aspect of the invention, the bearing, the rotation detecting magnet, the braking magnet, the connecting means, and the input rotary shaft are integrally assembled to form a sub-assembly, and the press-fitting portion of the bearing is provided. Since the rotation detecting magnet and the braking magnet are formed so as to have a push-in portion that protrudes in the radial direction, the sub-assembly can be easily press-fitted into the housing by a press-fitting jig that abuts against the press-in portion. While being able to
By this press-fitting, the bearing, the rotation detecting magnet, the braking magnet, the connecting means, and the input rotating shaft can be simultaneously assembled in the housing. Further, since the press-fitting is carried out by bringing the jig into contact with the pressing portion of the bearing, it can be carried out without imposing an unreasonable load on other members constituting the sub-assembly.

According to the second aspect of the present invention, since the pushing portion is formed by the large diameter portion of the bearing formed to have a diameter larger than that of the rotation detecting magnet and the braking magnet, the press-fitting jig is the rotation detecting magnet. Also, the sub-assembly can be press-fitted into the housing by contacting the large-diameter portion of the bearing as the pushing portion without interfering with the braking magnet.

According to a third aspect of the present invention, the pressing portion is formed by a ridge formed so as to project in the axial direction outside the press-fitting portion of the bearing so as to be press-fitted into the press-fitting groove formed in the inner wall of the housing in the axial direction. Therefore, the sub-assembly can be press-fitted into the housing by abutting the protrusion of the bearing as the pushing portion without the interference of the press-fitting jig with the rotation detecting magnet and the braking magnet. The ridge is fitted into the press-fitting groove to firmly integrate the bearing and the housing.

According to the fourth aspect of the present invention, since the input rotary shaft is made of synthetic resin and is integrally formed with the connecting means, the input rotary shaft is made of synthetic resin to reduce the weight and the space between the input bearing and the bearing. Good rotational performance can be ensured, and the integration process eliminates the process of assembling the input rotary shaft and the connecting means and the retaining bush, which have been conventionally required.

According to a fifth aspect of the present invention, the bearing, the rotation detecting magnet, the braking magnet, the connecting means, and the input rotary shaft are integrally assembled to form a sub-assembly, and the housing of the bearing is provided. The press-fitting portion into the inside is formed to have a push-in portion that protrudes in the radial direction from the rotation detecting magnet and the braking magnet, and the press-fitting jig is brought into contact with the push-in portion to bring the sub-assembly into contact. The press-fitting jig does not interfere with the rotation detecting magnet and the braking magnet during press-fitting, and the press-fitting allows the bearing, the rotation detecting magnet, the braking magnet, and the coupling to be connected. The means and the input rotary shaft can be assembled in the housing at the same time.

Further, according to the invention of claim 6, since the input rotary shaft constituting the sub-assembly is formed of synthetic resin, the input rotary shaft is rotated by deformation due to heat fusion without mechanical stress load. The detection magnet can be easily assembled to the input rotary shaft, and since the input rotary shaft and the connecting means are integrally formed, the assembly process for both and the retaining bush, which are conventionally required, are unnecessary.

[0030]

The present invention will be described in detail below with reference to the illustrated embodiments.

1 and 2 show a speed sensor 1 as an example.

This speed sensor 1 is different only in a bearing, an input rotary shaft, and a connecting means for connecting the input rotary shaft and a rotation transmitting shaft for taking out the rotation of the transmission, and other structures are the same as the conventional speed sensor described above. It has the same configuration as 100. For this reason, the same constituent elements are designated by the same reference numerals and redundant description will be omitted.

Bearing 2 in this speed sensor 1
Is a magnet fixing portion 21 to which the ring-shaped braking magnet 120 is attracted and fixed, and the magnet fixing portion 21.
The press-fitting portion 22 has a diameter larger than that of the rotation-detecting magnet 104 and the braking magnet 120.
Is formed. Pushing part 22a at this time
Is formed as a large diameter portion of the bearing 2 formed to have a larger diameter than the rotation detecting magnet 104 and the braking magnet 120 as shown in FIG.

The input rotary shaft 3 and the continuous means 4 in the speed sensor 1 are integrally formed.

That is, the input rotary shaft 3 is formed of a synthetic resin material such as nylon, polyphenylene sulfide, liquid crystal polymer, etc., and has a small-diameter shaft portion 31 formed at the tip and a rear end of the small-diameter shaft portion 31. The large-diameter shaft portion 32 is formed continuously on the side, and the rear end portion of the large-diameter shaft portion 32 is formed with a flange portion 33 having a larger diameter.

The input rotary shaft 3 is integrally formed around the rotary shaft side core portion 4a of the connecting means 4 by insert molding. At this time, the connecting means 4 heat-treats both ends of the material obtained by cutting the metal inner cable of the meter cable except for the intermediate portion which becomes the flexible shaft portion 4b, and thereafter press-processes the heat-treated portion, respectively. The connecting portion 4 having the same shape as the above-described conventional connecting portion 105c, which has the rotating shaft side core portion 4a and the connecting portion side core portion 4c of the rectangular cross section and has the key 4e around the connecting portion side core portion 4c.
The d is integrally formed by insert molding with a synthetic resin.

Then, the bearing 2 and the input rotary shaft 3
The integrated body of the rotation detecting magnet 1 and the connecting means 4 is the rotation detecting magnet 1.
04 and the braking magnet 120 are integrally assembled to form the sub-assembly 5.

That is, in the sub-assembly 5, the braking magnet 120 is attracted and fixed to the magnet fixing portion 21 of the bearing 2, and the flange portion 33 of the input rotating shaft 3 is abutted against the end face of the bearing 2 on the press-fitting portion 22 side. The large diameter shaft portion 32 is rotatably supported by the bearing 2 with the small diameter shaft portion 31 side protruding toward the magnet fixing portion 21 side of the bearing 2, and the magnet fixing portion 21 of the bearing 2 is also supported.
The sliding washer 121 and the thrust washer 122 are externally fitted to the large-diameter shaft portion 32 and the small-diameter shaft portion 31 protruding to the side, respectively, and the rotation detection magnet 104 is attached to the small-diameter shaft portion 31 located on the tip side of the thrust washer 122. Is attached and assembled integrally.

Since the input rotation shaft 3 is made of synthetic resin, the rotation detecting magnet 104 is deformed by heat deformation by an appropriate heating jig pressed against the tip end surface of the small diameter shaft portion 31 of the input rotation shaft 3. And a thrust washer 122 are held and attached. The rotation detecting magnet 104 can be attached more easily than metal working using a punch or the like, and since there is no mechanical stress load, the rotation detecting magnet 104 is not likely to be damaged and the workability is improved. Can be achieved.

As shown in FIG. 2, the sub-assembly 5 assembled in this manner is inserted into the housing 101 from the open end 101b on one end side, with the connecting portion 4d of the connecting means 4 at the beginning (A in FIG. 2). Direction)), and the press-fitting portion 22 of the housing 2 by a suitable press-fitting jig (not shown) that abuts the push-in portion 22a of the press-fitting portion 22 of the bearing 2 from the outside.
01 is press-fitted into the housing 101, and the end face on the press-fitting portion 22 side is brought into contact with the step portion 101a to be assembled in the housing 101.

As described above, when the sub-assembly 5 is assembled, the press-fitting portion 22 of the bearing 2 having a larger diameter than the rotation detecting magnet 104 and the braking magnet 120 is formed.
A press-fitting jig is brought into contact with the pushing portion 22a of the housing 1
Since it is press-fitted into 01, the sub-assembly 5
For detecting rotation 104 as another member constituting the
And the braking magnet 120 and the press-fitting jig do not interfere with each other. As a result, both magnets 104
And the magnets 104 avoiding an unreasonable load on the magnets 104.
And 120 can be performed without damaging them and the workability is improved.

By assembling the sub-assembly 5, the bearing 2, the rotation detecting magnet 104, the braking magnet 120, the input rotary shaft 2 and the connecting means 4 are simultaneously assembled in the housing 101. The work is simplified.

The housing 101 in which the sub-assembly 5 is assembled has its one end side open end 101b closed by an end cap 110 having a circuit portion 108 with a magnetoelectric conversion element 103 inside to obtain the speed sensor 1. it can.

Like the speed sensor 100 described above, the speed sensor 1 has a key groove 201 of a rotation transmission shaft 201 that rotates in synchronization with the rotation of the transmission 200.
The connecting portion 4d is inserted into the shaft hole 201a of the rotation transmitting shaft 201 so that the key 4e is engaged with b, and the female screw 107a of the mounting recess 107 is disposed inside the rotation transmitting shaft 201 to the transmission 200 side. The sleeve 200 is mounted by being screwed onto the male screw 202a of the provided sleeve 200, and transmits the rotation of the transmission 200 to the input rotary shaft 3 via the rotation transmission shaft 201 and the connecting means 4, and the rotation of the input rotary shaft 3 is accompanied. A change in the magnetic field of the rotation detecting magnet 104 is detected by the magnetoelectric conversion element 103, and an electric signal thereof is output to the indicating instrument through the terminal 130 to display a predetermined speed.

The speed sensor 1 configured as described above
Since the input rotary shaft 3 is formed of a synthetic resin material, it is possible to reduce the weight and secure good rotatability of the input rotary shaft 3 with respect to the bearing 102, and the connecting means 4 and the input rotary shaft 3 are integrated. Since the construction is employed, the retaining bush 109 which is conventionally required is not required, and the number of parts and the number of assembling steps are reduced, so that the assembling workability can be improved and the cost can be reduced.

Further, in the speed sensor 1, since the connecting means 4 is provided with the flexible shaft portion 4b, even if the misalignment S occurs between the input rotating shaft 3 and the rotation transmitting shaft 201, the misalignment is caused by the flexible shaft portion. 4b can efficiently absorb it, and as a result, the transmission of the eccentric load due to the misalignment S to the input rotary shaft 3 and the rotation transmission shaft 201 is prevented, and the creaking and rotation unevenness of both shafts 3, 201 are suppressed. Smooth rotation can be secured.

3 and 4 show a speed sensor 10 as another embodiment.

The speed sensor 10 is the same as the speed sensor 1 described above except for the pressing portion formed on the bearing. Therefore, in the following description, the same constituents will be given the same reference numerals and overlapping description will be omitted.

Bearing 2 in this speed sensor 10
0 is the magnet fixing portion 21 like the bearing 2 described above.
And a press-fitting portion 22. The ridge 2 as a pushing-in portion is formed on the outside of the press-fitting portion 22 at equal intervals in the circumferential direction.
2b is formed. The protrusion 22b is formed so as to protrude in the axial direction outside the press-fitting portion 22 of the bearing 20 so as to be press-fitted into the press-fitting groove 6 formed in the inner wall of the housing 101 at equal intervals in the circumferential direction and formed in the axial direction. The rotation detecting magnet 104 and the braking magnet 120 are formed so as to protrude in the radial direction.

The bearing 20 thus formed has the same rotation detecting magnet 104, thrust washer 122, and sliding washer 12 as the sub-assembly 5 described above.
1, a braking magnet 120, and an integrated body of the synthetic resin input rotary shaft 3 and the connecting means 4 are integrally assembled to form a sub-assembly 7. The sub-assembly 7 is inserted from the one end side open end 101b so that each protrusion 22b corresponds to each press-fitting groove 6 (in the direction A of FIG. 4), and by the press-fitting jig that abuts against the protrusion 22b. The bearing 2 is press-fitted into the housing 101, and the end face of the bearing 2 on the press-fitting portion 22 side is brought into contact with the step portion 101a to be fixed in the housing 101. According to this sub-assembly 7, the post-press fit projection 22b is fitted into the press fit groove 6 so that the bearing 20 and the housing 101 are firmly integrated.

Similar to the speed sensor 1 described above, the speed sensor 10 can simplify the assembling work and improve its workability, and the input rotary shaft 3 can be used.
It is possible to secure good rotatability.

[0052]

As described in detail above, the present invention has the following effects.

That is, according to the invention of claim 1,
The bearing, the rotation detecting magnet, the braking magnet, the connecting means, and the input rotating shaft are integrally assembled as a sub-assembly, and the press-fitting portion of the bearing is arranged in the radial direction more than the rotation detecting magnet and the braking magnet. Since the sub-assembly is formed to have a push-in portion that protrudes into the housing, the sub-assembly can be easily press-fitted into the housing by a press-fitting jig that abuts against the push-in portion, and the press-fitting allows the bearing and rotation detection. The magnet, the braking magnet, the connecting means, and the input rotary shaft can be assembled in the housing at the same time, and as a result, a speed sensor whose assembly work is simplified can be provided.

Further, according to the invention of claim 1, since the press-fitting is performed by bringing the press-fitting jig into contact with the pressing portion of the bearing, an unreasonable load is applied to other members constituting the sub-assembly. As a result, it is possible to provide a speed sensor with improved assembling workability that does not particularly damage the rotation detecting magnet and the braking magnet.

According to the second aspect of the present invention, since the pressing portion is formed by the large diameter portion of the bearing formed to have a larger diameter than the rotation detecting magnet and the braking magnet, the press-fitting jig detects the rotation. The sub-assembly can be press-fitted into the housing by contacting the large-diameter portion of the bearing as the pushing portion without interfering with the magnet for braking and the magnet for braking, and as a result, the same as the invention according to claim 1. A speed sensor having an effect can be provided.

According to the third aspect of the present invention, the protrusion is formed so as to project in the axial direction on the outside of the press-fitting portion of the bearing so that the pressing portion is press-fitted into the press-fitting groove formed in the inner wall of the housing in the axial direction. Since the press-fitting jig is formed by a strip, the sub-assembly can be press-fitted into the housing by abutting on the protrusion of the bearing as the pressing portion without interfering with the rotation detection magnet and the braking magnet. After the press-fitting, the protrusion is fitted in the press-fitting groove to firmly integrate the bearing and the housing. As a result, in addition to the effect of the invention according to claim 1, there is provided a speed sensor in which the bearing is firmly fixed in the housing. can do.

According to the fourth aspect of the present invention, since the input rotary shaft is formed of synthetic resin and is integrally formed with the connecting means, the input rotary shaft is made of synthetic resin, so that the weight and the bearing can be reduced. It is possible to secure good rotatability between them, and because of the integration, the assembly process of the input rotary shaft and the continuous means and the retaining bush, which were required in the past, are not required. As a result, the assembly process and the number of parts are reduced. It is possible to provide a speed sensor in which the mounting speed is reduced and the mounting is further simplified.

According to a fifth aspect of the present invention, the bearing, the rotation detecting magnet, the braking magnet, the connecting means, and the input rotary shaft are integrally assembled as a sub-assembly, and the bearing has the above-mentioned structure. The press-fitting portion into the housing is formed to have a push-in portion that protrudes in the radial direction from the rotation detection magnet and the braking magnet. Since the assembly is press-fitted into the housing, the press-fitting jig does not interfere with the rotation detection magnet and the braking magnet at the time of press-fitting, and the press-fitting causes the bearing, the rotation detection magnet, and the braking magnet, The connecting means and the input rotary shaft can be assembled in the housing at the same time, so that the assembling work is simple and the rotation is easy. It is possible to provide Deyo magnet, and method of assembling the improved speed sensors that no assembly work lead to damage of the brake magnet.

Further, according to the invention of claim 6, since the input rotary shaft constituting the sub-assembly is made of synthetic resin, the rotary shaft can be deformed by heat fusion without mechanical stress load. The rotation detecting magnet can be easily assembled to the input rotation, and since the input rotating shaft and the connecting means are integrally formed, the assembling step for both and the retaining bush which are conventionally required are not required. As a result, the assembling of the sub-assembly becomes easy, and it is possible to provide the assembling method of the speed sensor in which the assembling work is further simplified.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a speed sensor as an example.

FIG. 2 is an exploded perspective view of the speed sensor of FIG. 1 with a part thereof cut away.

FIG. 3 is a sectional view of a speed sensor as another embodiment.

FIG. 4 is an exploded perspective view of the speed sensor of FIG. 3 with a part thereof cut away.

FIG. 5 is a sectional view of a conventional speed sensor.

[Explanation of symbols]

 1, 10 Speed sensor 2, 20 Bearing 3 Input rotary shaft 4 Connecting means 5, 7 Subassembly 6 Press-fit groove 22 Press-fit part (for bearing) 22a Push-in part 22b Projection (push-in part) 31 Small-diameter shaft part (tip part) 32 Large-diameter shaft part (intermediate part) 101 Housing 103 Magnetoelectric conversion element 104 Rotation detection magnet 120 Braking magnet 200 Transmission 201 Rotation transmission shaft

Claims (6)

[Claims] 1. A rotation detecting magnet, which is rotatably detected by a magnetoelectric conversion element, is rotatably supported at an intermediate portion by a bearing press-fitted and fixed in a housing that is externally connected to a transmission. In a speed sensor having a rear end portion connected to a rotation transmission shaft for extracting rotation of the transmission via a connecting means, and an input rotation shaft to which a braking force is applied by a braking magnet adsorbed and fixed to the bearing, The bearing, the rotation detecting magnet, the braking magnet, the connecting means, and the input rotating shaft are integrally assembled to form a sub-assembly, and the press-fitting portion of the bearing is more than the rotation detecting magnet and the braking magnet. A speed sensor characterized in that it is formed with a pushing portion protruding in the radial direction. 2. The speed sensor according to claim 1, wherein the pushing portion is a large-diameter portion of a press-fitting portion of the bearing, which has a larger diameter than the rotation detecting magnet and the braking magnet. Is a speed sensor. 3. The speed sensor according to claim 1, wherein the push-in portion is axially arranged outside the press-fitting portion of the bearing so as to be press-fitted into a press-fitting groove formed axially in the inner wall of the housing. A speed sensor characterized in that it is a ridge formed to be protruded in the. 4. The speed sensor according to claim 1, wherein the input rotary shaft is made of synthetic resin and is integrally formed with the connecting means. And a speed sensor. 5. A rotation detection magnet, which is rotationally detected by a magnetoelectric conversion element, is attached to a tip of a bearing, which is rotatably supported by a bearing that is press-fitted and fixed in a housing that is externally connected to a transmission. A set of speed sensors having a rear end portion connected to a rotation transmission shaft for taking out the rotation of the transmission through a connecting means, and an input rotation shaft to which a braking force is applied by a braking magnet adsorbed and fixed to the bearing. In the mounting method, the bearing, the rotation detecting magnet, the braking magnet, the connecting means, and the input rotating shaft are integrally assembled to form a sub-assembly, and the press-fitting portion of the bearing into the housing is the rotating member. The magnet for detection and the magnet for braking are formed to have a pushing portion that protrudes in the radial direction, The method of assembling the speed sensor, wherein the write unit is abutted against the press-fit jig and press-fitting the subassembly into the housing. 6. The method of assembling a speed sensor according to claim 5, wherein the input rotary shaft is formed of synthetic resin and is integrally formed with the connecting means. Assembling method.