JPH05312817A - Revolution detector - Google Patents

Abstract

PURPOSE:To improve the joint work efficiency with a transmission 24 side and effectively transmit revolution to a rotary shaft 3, reducing cost by reducing the number of works for a connecting member 23. CONSTITUTION:A rotary shaft 3 is installed through an oil-immersed bearing 2 in a cylindrical case 1. A magnet 4 is installed on one edge side of the rotary shaft 3. A detection part 6 is formed in close to the magnet 4. The other edge side of the rotary shaft 3 and an outside rotary shaft 25 are connection-coupled by a flat plate-shaped connecting member 23. The connecting member 23 is installed in shiftable manner in the thrust direction, and at the same time, a flange part 23B for regulating the shift is installed. A constricted part 23C is formed so that the clearance between an insertion hole 26A and the connecting member 23 becomes max. in the connection coupling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation detecting device mounted on a transmission of an automobile, for example.

[0002]

2. Description of the Related Art Conventionally, a rotation detecting device of this type, which is mounted on a transmission of a vehicle such as an automobile, supports a rotating shaft through a bearing such as an oil-impregnated bearing in a cylindrical case,
A magnet is fixed to the inner end side of the rotating shaft located inside the case, and the magnet is mounted on a circuit board by a detection unit in which a yoke is provided on a bobbin having a coil winding wound around the magnet. A detection unit is arranged in close proximity, and the detection unit detects rotation of the magnet and outputs an electric signal proportional to the traveling speed, and the opening of the cylindrical case is covered by a packing or the like. The case is closed by the body and the inside of the case accommodating the magnet and the like is kept in a sealed state.

On the outer end side of the rotary shaft to which the magnet is not fixed, for example, Japanese Utility Model Laid-Open No. 4-219963, Japanese Utility Model Laid-Open No. 4-11467, and Japanese Utility Model Laid-Open No. 62-168467 are used.
The connecting member is connected as shown in Japanese Unexamined Patent Publication (Kokai), etc., and the other end of the connecting member is connected to an external rotary shaft for taking out rotation provided on the transmission. The rotation of the transmission is transmitted to the rotary shaft by a member, and the rotary shaft is driven.

[0004]

However, since such a connecting member is connected to the rotating shaft and the external rotating shaft on the transmission side, for example, a cylindrical member made of a metal material is cut, pressed, milled, processed into a header or the like. Since it is necessary to perform various processes to provide a relatively small-diameter prismatic part or a protrusion for preventing rotation, etc., the manufacturing cost of the connecting member becomes expensive as the number of processing of the connecting member increases. There was a point.

The present invention has been made in view of the above problems, and an object of the present invention is to reduce the number of processing of the connecting member to reduce the cost and to improve the work efficiency of the joint with the transmission side. Another object of the present invention is to provide a rotation detecting device capable of effectively transmitting rotation to a rotation shaft.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a rotary shaft supported and supported by a bearing in a cylindrical case, a magnet rotating integrally with the rotary shaft, and a magnetic change caused by the rotation of the magnet. A connecting member having one end connected to the rotary shaft in the case and the other end inserted outside the case so that the rotary shaft and the external rotary shaft can be jointed. A flange portion that is formed in a flat plate shape, holds and retains the connecting member in the case, and is provided so that the connecting member is movable in the thrust direction, and that the movement in the thrust direction can be limited to a predetermined width. Is provided on the connecting member, and when the rotating shaft and the external rotating shaft are jointed by the connecting member, one end of the connecting member is provided on the bottom of the case so that the one end can be inserted out of the case. Outlet and the connecting part Clearance between is constituted by providing the portion constricted to the connecting member so as to be maximum.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show an embodiment of the present invention, in which reference numeral 1 denotes a tubular case, and a rotary shaft 3 through an oil-impregnated bearing 2 provided in a bearing mounting hole 1A communicating the inside and outside of the tubular case 1. Is supported.

Reference numeral 4 denotes a magnet which is located inside the cylindrical case 1 and is fixed to the inner end side of the rotary shaft 3, and a plurality of N poles and a plurality of S poles alternate in the circumferential direction of the magnet 4. Has been magnetized.

Reference numeral 5 denotes an inner case formed by insert molding of a synthetic resin, which is fitted on the inner peripheral surface of the cylindrical case 1, and has a detecting portion 6 molded therein. The interior case 5 and the tubular case 1 form an internal space in which the magnet 4 is arranged.

The detection unit 6 includes a bobbin 8 made of a synthetic resin around which a coil winding 7 is wound, a pair of terminals 9 for connecting the winding start and end terminals of the coil winding 7, and first, second, third parts. Of the yokes 10, 11, 12 and the yoke shaft cylinder 13 are also fitted onto the yoke shaft.
It is composed of 14 and. The bobbin 8 is disposed close to the magnet 4 at a position where the tubular portion 8A is coaxial with the rotating shaft 3, and the yoke shaft barrel 13 is inserted into the tubular portion 8A.

The first yoke 10 includes a flat portion 10A and a peripheral side surface portion 10.
A plurality of yoke pieces 10 corresponding to one magnetic pole of the magnet 4 are formed on the peripheral edge of the peripheral side surface portion 10B by forming a case with B.
C extend at equal intervals, and a hole 15 is formed at the center of the flat portion 10A.
The case-shaped portion of the first yoke 10 is externally fitted to the bobbin 8 from the side of the collar 8B, and the yoke piece 10C reaches the peripheral side portion of the magnet 4.

In the second yoke 11, a plurality of yoke pieces 11B corresponding to the other magnetic pole of the magnet 4 are extended at equal intervals on the peripheral portion of the flat portion 11A, and a hole 16 is formed in the center of the flat portion 11A. The flat portion 11A of the second yoke 11 is brought into contact with the flange 8C on the side not having the terminal 9, and the yoke piece 11B is arranged between the yoke pieces 10C of the first yoke 10. Then, the yoke shaft 14 is fitted into the yoke shaft cylinder 13 in the cylindrical portion 8A from the hole 16 of the second yoke 11, and is superposed on the flat portion 11A of the first yoke 10 to form a flat plate shape for enhancing magnetic efficiency. The hole 17 of the third yoke 12 is inserted and fastened by the caulking portion 18.

Interior case 5 integrally having a detection unit 6
The wave washer 19 made of a metal thin plate such as stainless steel is inserted from the opening side of the tubular case 1, and then the lower end side of the inner case 5 is inserted into the tubular case 1 to fit the wave washer 19 to the lower end of the inner case 5. The thin flange 22 of the case 1 in a state in which the peripheral flange 20 that is pressed on the outer peripheral surface of the inner case 5 and is projected on the front end side of the inner case 5 is placed on the step portion 21 formed on the inner peripheral edge of the opening of the cylindrical case 1. The inner case 5 around the collar 20
The cylindrical case 1 and the inner case 5 are integrally fixed by caulking to the upper surface of the.

Reference numeral 23 denotes a connecting member for connecting and connecting the rotating shaft 3 and an external rotating shaft 25 for transmitting the rotation of the transmission 24. The connecting member 23 is formed by pressing a flat metal material and has a flat plate shape. In addition, a relatively narrow insertion portion 23A is formed on the rotary shaft 3 side portion, and the insertion portion 23A has a substantially square cross section. Further, a relatively wide flange portion 23 is provided in the central portion of the connecting member 23, and between this flange portion 23A and the end portion of the connecting member 23 on the external rotary shaft 25 side, this portion is formed. Constricted portion 23 formed by cutting out a part in the width direction
C is provided.

The insertion portion 23 provided on the connecting member is
The inside of the rotary shaft 3 is inserted into an insertion hole 3A which is cut out in the axial direction so that the insertion portion 23A can be inserted.
In this case, the insertion hole 3A corresponds to the shape of the insertion portion 23A,
Moreover, the diameter of the insertion portion 23 is slightly larger than the outer diameter of the insertion portion 23 so that the connecting member 23 can move in the thrust direction within the insertion hole 3A. In this embodiment, the rotary shaft 3
An insertion hole 3A is formed inside, and the insertion portion 2 is inserted into this insertion hole 3A.
3A is inserted to connect the rotary shaft 3 and the connecting member 23 to each other. However, for example, the insertion hole 3A may be a groove, and if the connecting joint is possible, it can be appropriately selected from various connecting means. Good.

The flange portion 23B is formed in the end portion of the cylindrical case 1 on the transmission 24 side and is provided in the hole portion 1B communicating with the bearing mounting hole 1A. The flange portion 23B is located on the rotary shaft 3 side. , The step portion 1C provided in the hole portion 1B, and the cylindrical case 1 on the external rotary shaft 25 side.
By contacting the lid member 26 provided at the bottom of the connecting member 23, the connecting member 23 is retained in the tubular case 1 so as not to come off, and movement of the connecting member 23 in the thrust direction can be regulated.

The constricted portion 23C is provided so as to correspond to the position of the insertion hole 26A into which the end of the connecting member 23 provided on the lid member 26 on the side of the external rotary shaft 25 can be inserted, and the constricted portion 23C is a cylinder. When the case 1 side is assembled to the transmission 24 side,
It is provided so as to correspond to the position of the insertion hole 26A.

The tubular case 1 and the transmission 24 are assembled by screwing the tubular case 1 to the transmission 24, and by this screwing and fastening, the end of the connecting member 23 on the external rotary shaft 25 side and the outside are connected. The fitting groove 25A formed on the tip end surface of the rotary shaft 25 is fitted, and the coupling joint by the coupling member 23 between the rotary shaft 3 and the external rotary shaft 25 is completed. In this embodiment, the connecting member 23 is inserted out of the case 1 through the insertion hole 26A of the lid member 26 provided at the bottom of the case 1.

The rotation of the external rotary shaft 25 on the transmission 24 side is transmitted to the rotary shaft 3, and the change of the magnetic pole due to the rotation of the magnet 4 flows to the coil winding 7 through the first and second yokes 10 and 11. It is configured to be detected as a change in the exciting current and output from the terminal 9 as a pulse signal.

Next, the cylindrical case 1 side and the transmission
Assembling with 24 side, and rotating shaft 3 associated with assembling
A connecting joint of the external rotating shaft 25 and the connecting member 23 will be described.

FIG. 2 shows a state before assembly. At this time, the end face of the flange portion 23B of the connecting member 23 on the side of the external rotary shaft 25 is a lid member.
26, and by this contact, the connecting member 23 is retained in the cylindrical case 1 in the direction of the external rotation shaft 25 so as not to come off.

FIG. 3 shows a state at the time of assembling, in this case, a state before the end portion of the connecting member 23 on the outer rotary shaft 25 side and the fitting portion 25A of the outer rotary shaft 25 are fitted. .. Then, in the process of screwing the tubular case 1 onto the transmission 24, the connecting member 23 comes into contact with the tip end surface of the external rotating shaft 25, and due to this contact, the connecting member 23 gradually moves in the thrust direction (in this case, the rotating shaft 3 direction). ), The end surface of the flange portion 23B on the rotary shaft 3 side comes into contact with the step portion 1C in the cylindrical case 1.
The contact of the flange portion 23B restricts the movement of the connecting member 23 in the thrust direction, and when the tubular case 1 is further screwed, the end portion of the connecting member 23 on the external rotating shaft 25 side is rotated to the external rotating shaft.
Fit in the fitting groove 25A of 25. When the tubular case 1 is screwed, the connecting member 23 also rotates integrally.

At this time, the clearance between the inner diameter of the insertion hole 26A of the lid member 26 and the maximum diameter width of the connecting member 23, that is, the width of the connecting member 23 in the lateral direction in FIG. 3, is set to the minimum. For this reason, even if the connecting member 23 moves laterally in the figure during assembly and a deviation occurs with respect to the axis of the connecting member 23 and the external rotation shaft 25, the connecting member 23 does not contact the wall portion of the insertion hole 26A. The contact in the width direction is restricted. Therefore, a large movement of the connecting member 23 in the width direction that would cause a fitting failure between the connecting member 23 and the fitting groove 25A of the external rotary shaft 25 does not occur.

FIG. 4 shows a state after assembly, in which the flange portion 23B does not contact the step portion 1C and the lid member 26, and the hole portion 1B is formed.
It becomes rotatable inside, and the constricted portion 23C makes it possible to secure a sufficient clearance between the connecting member 23 and the insertion hole 26A of the lid member 26. Even after the assembling, the connecting member 23 moves in the width direction in the drawing. Even connecting member 23 and insertion hole
There is no contact with 26A. Therefore, friction between the connecting member 23 and the insertion hole 26 does not occur.

As described above in detail, in the embodiment of the present invention, since the connecting member 23 is press-formed into a flat plate shape, the manufacturing cost can be reduced. Further, since the connecting member 23 is provided so as to be movable in the thrust direction and the flange portion 23B and the constricted portion 23C are provided, the flange portion 23B allows the constricted portion 23C position and the cover member to be provided during assembly.
The positions of the insertion holes 26A of 26 do not coincide with each other, and the movement of the connecting member 23 is restricted. Therefore, the connecting work between the connecting member 23 and the external rotary shaft 25 is easy to perform, and the poor fitting is unlikely to occur. Further, after the assembling, the position of the constricted portion 23C and the position of the insertion hole 26A of the lid member 26 coincide with each other, and the clearance between them becomes maximum so that friction does not occur. Therefore, the rotation of the external rotary shaft 25 can be effectively performed. 3 can be transmitted.

The present invention is not limited to this embodiment, and various modifications can be made within the scope of the above-mentioned claims.

[0027]

According to the present invention, a rotary shaft supported and supported by a bearing in a cylindrical case, a magnet rotating integrally with the rotary shaft, and detection for detecting a magnetic change due to the rotation of the magnet. And a connecting member having one end connected to the rotary shaft in the case and the other end inserted outside the case so that the rotary shaft and the external rotary shaft can be jointed,
The connecting member is formed in a flat plate shape, is retained in the case so as to be retained, and the connecting member is provided so as to be movable in the thrust direction, and a flange portion capable of limiting the movement in the thrust direction to a predetermined width is provided. A hole provided on the bottom of the case so that one end of the connecting member can be inserted into the case when the rotary shaft and the external rotary shaft are joined by the connecting member. Since the constricted portion is provided on the connecting member so that the clearance with the connecting member is maximized, the working efficiency of the joint with the transmission side can be improved while reducing the number of processing of the connecting member to reduce the cost. Thus, it is possible to provide a rotation detection device that can effectively transmit rotation to the rotation shaft.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the state of assembly in FIG.

FIG. 3 is a cross-sectional view showing the state of assembly in FIG.

FIG. 4 is a cross-sectional view showing the state of assembly in FIG.

5 is a perspective view showing a main part of FIG. 1. FIG.

[Explanation of symbols]

 1 Cylindrical case 2 Oil-impregnated bearing 3 Rotating shaft 4 Magnet 6 Detection part 23 Connecting member 23B Flange part 23C Constriction part 25 External rotating shaft 26A Insertion hole

Claims (3)

[Claims] 1. A rotary shaft supported and supported by a bearing in a cylindrical case, a magnet that rotates integrally with the rotary shaft, and a detector that detects a magnetic change due to the rotation of the magnet. A connecting member having one end connected to the rotating shaft in the case and the other end inserted outside the case so that the rotating shaft and the external rotating shaft can be jointed, and the connecting member is a flat plate. A rotation detecting device, which is formed into a shape and is retained and retained in the case. 2. The rotating member according to claim 1, wherein the connecting member is provided so as to be movable in the thrust direction, and the connecting member is provided with a flange portion capable of limiting the movement in the thrust direction to a predetermined width. Detection device. 3. When the rotary shaft and the external rotary shaft are joined by the connecting member, one end of the connecting member is provided in the bottom of the case so that the one end of the connecting member can be inserted outside the case, and 2. The constricted portion is provided on the connecting member so that the clearance with the connecting member is maximized.
And the rotation detecting device according to claim 2.