JPS6035895Y2 - Rotation detector shaft structure - Google Patents

Description

[Detailed description of the invention] This invention relates to a shaft structure of a rotation detector in which a connecting shaft is interposed and connected between a plurality of rotation transmission shafts, and the rotational speed of the connecting shaft is detected by a rotation detecting means. It is something.

This type of rotation detector is used for general industrial machinery, agricultural machinery,
Alternatively, it can be used and is used in a wide range of fields such as automobiles. For example, in automobiles, as shown in FIG. A rotation detector 5 is interposed between the rotation transmitting shaft (input shaft) 4, and the connecting shaft of the rotation detecting device 5 is interposed and connected between the two rotation transmitting shafts 2 and 4. The number of rotations is converted into a pulse signal and detected by a rotation detecting means consisting of, for example, a combination of a reed switch and a magnet.

This rotational speed detection signal is then transmitted to an automobile speed control device, an automatic headlamp flashing device, etc., so that the respective functions can be performed.

In such a rotation detector 5, for example, as shown in FIG.
a rotation transmission shaft 2 (such as an output shaft of a transmission) having a rotation transmission shaft 2 (an output shaft of a transmission, etc.); etc.) to perform rotation transmission, a rotation transmission mechanism in which the rotation transmission shafts 2 and 4 are interposed and connected between the groove transmission shafts 2 and 4;
For example, as shown in FIG. 3, a rotation transmission shaft 2 having a square hole 22 and a rotation transmission shaft 4 having a square rod 24 that can fit into the square hole 22 are coupled to perform rotation transmission. In contrast to the rotation transmission mechanism that is configured to rotate, there is one that is interposed and connected between the two grooved transmission shafts 2 and 4.

More specifically, the connection shaft 30 of the rotation detector 5 shown in FIG.
is formed into a circular bar portion 34 having a radial protrusion 33 that can be engaged with the engagement groove 11 on one end thereof, and a circular hole portion having a retaining groove 31 in the axial direction on the other end thereof. 32 (cylindrical in the illustrated case), one end of the connecting shaft 30 can be coupled to the rotation transmission shaft 2, and the other end can be coupled to the rotation transmission shaft 4.

In the illustrated example, the tip of the circular rod portion 34 of the connecting shaft 30 is shaped into a spherical portion 34a to absorb eccentricity and prevent rattling.

Further, the connecting shaft 40 shown in FIG. 3 has one end formed into a square rod part 44 (in this case, a square cross section) that can fit into the square hole 22, and the other end formed into a square rod part 44 that can fit into the square hole 42.
(In this case, a square hole in cross section) is formed so that one end side of the waist connecting shaft 40 can be connected to the rotation transmission shaft 2, and the other end side can be connected to the rotation transmission shaft 4.

In the rotation detector 5 shown in FIGS. 2 and 3 above,
A magnet body 52 having a plurality of N and S magnetic poles is fixed to the outer periphery of the connecting shaft 30.40 via a non-magnetic cylindrical member 51, and the other end of the connecting shaft 30.40 is A spherical member 53 is fixed.

This spherical member 53 is supported by a bearing 55 fixed within a generally cylindrical casing 54, and is capable of dynamic alignment.

In addition, the bearing 55 shown in FIG. 3 has the structure shown in FIG. 2, in which the spherical member 53 is held by two half-split bearings 55a, 55a of the same shape, which may cause abnormal wear or misalignment. This prevents the possibility of noise or abnormal noises occurring.

A male threaded portion 56 is formed on the outer periphery of the casing 54, into which the female threaded portion 16 of the mounting nut 15 of the rotation transmission shaft 4 can be screwed.

A reed switch 58 is provided on the outer periphery of the casing 54 facing the magnet 52 so as to be spaced apart from the accommodation space 57 of the connecting shaft 30, 40.

That is, the reed switch 58 and the magnet 52 constitute rotation detection means.

Note that the reed switch 58 and the lead wire 59 are embedded in an insulating resin 60 to improve waterproofness, vibration resistance, and the like.

A flanged cylindrical member 6 is provided at the other end of the casing 54.
1 is fixed - A mounting nut 62 is rotatably provided on this cylindrical member 61.

Then, the female threaded portion 63 of the mounting nut 62 is screwed into the male threaded portion 17 of the rotation transmission shaft 2, so that the two can be fixed via a packing 64.

As described above, in the conventional case, the rotation transmission mechanism employs a structure in which the rotation transmission shaft 2 having the circular hole portion 12 and the rotation transmission shaft 4 having the circular rod portion 14 are coupled, or Rotation transmission shaft 2 having a hole 22 and square rod portion 24
This has the disadvantage that rotation detectors 5 having different connecting shaft structures 30 and 40 must be prepared separately depending on whether a structure is adopted for connecting the rotation transmitting shaft 4 with the connecting shaft 30 or 40.

The purpose of this invention is to eliminate the above-mentioned drawbacks of the prior art, and even if the coupling structures of the rotation transmission mechanisms are different, a rotation detector of a single structure can be interposed and connected to any of the rotation transmission mechanisms, and a common It is an object of the present invention to provide a shaft structure of a rotation detector that can reduce the number of parts and man-hours by reducing the number of parts and reduce the cost.

Hereinafter, embodiments of this invention will be described in detail based on the drawings.

FIGS. 4 to 8 show a rotation detector according to an embodiment of this invention. The other end of the connecting shaft 70 is shaped like a rectangular bar 74 (square in the illustrated example) that can fit into the rotation transmission shaft 2 having a square hole in the illustrated example. A circular hole 72 is formed with an axial engagement groove 71 into which a rotation transmission shaft 4 having a circular rod portion 14 provided with a radial protrusion 13 shown in FIG. It has an outer shape that can be fitted into the circular hole 12 and the circular hole 72 of the connecting shaft 70 and has a radial protrusion 73 that can be engaged with the engagements R11 and 71 provided in the circular holes 12 and 72, respectively. Additionally, an auxiliary connecting shaft 77 (see FIG. 4) having a square hole 75 (quadrangular in the illustrated case) into which the square body 24 of the rotation transmission shaft 4 and the square body 74 of the connecting shaft 70 are fitted is provided. It has a similar structure.

Furthermore, as shown in FIGS. 4 and 6, a non-magnetic cylindrical member 51 is provided on the outer circumference of the connecting shaft 70, similar to the rotation detector 5 shown in FIGS. 2 and 3. A magnet body 52 having a plurality of N and S magnetic poles is fixed thereto, and a spherical member 53 is press-fitted and fixed to the other end of the connecting shaft 70.

Note that the cylindrical member 51 is provided with a protrusion 51a that can engage with the retaining groove 71 to prevent its rotation.

The spherical member 53 is supported by a bearing 55 fixed within a generally cylindrical casing 54, and is capable of self-centering.

In this case, the bearing 55 rotatably supports the spherical member 53 by two halves of bearings 55a, 55a having the same shape.

A male threaded portion 56 is formed on the outer periphery of the casing 54, and the female threaded portion 16 of the mounting nut 15 of the rotation transmission shaft 4 is screwed into the male threaded portion 56.

At an outer peripheral position of the casing 54 facing the magnet body 52, a housing chamber 81 separate from the housing space 57 of the connecting shaft 70 is provided, as shown in FIGS. 4, 5, and 8. A reed switch 58 is provided.

That is, the reed switch 58 and the magnet 52 constitute rotation detection means.

In addition to the reed switch 58, a magnetic detection element such as a Hall element may be used, or other conventionally known rotation detection means may be used.

Further, the reed switch 58 is connected to the board 8 along with the lead wire 59.
2 and embedded in an insulating resin 60 to improve waterproofness, vibration resistance, etc.

Then, the M2S is fixed to the outside of the storage chamber 81.

Further, a flanged cylindrical member 61 is fixed to the other end of the casing 54, and a mounting nut 6 is attached to this cylindrical member 61.
2 is rotatably provided.

Then, the female threaded portion 63 of the mounting nut 62 is screwed into the male threaded portion 17 of the rotation transmission shaft 2, so that the rotation detector 5 can be attached to a fixed portion of the transmission 1 or the like via the packing 64.

In addition, in the structure of the rotation detector 5, the rotation transmission shaft 2
It is desirable to also consider the types of threads of the male threaded portion 17 and the female threaded portion 16 of the rotation transmission shaft 4.

For example, if the male thread part 17 and the female thread part 16 are M22X
Although the 1.5 metric thread and the 778"-18 unified thread are close to each other, they have slightly different dimensions.

Therefore, in order to screw the female threaded portion 63 of the mounting nut 62 into either of the two types of male threaded portions 17 mentioned above, the dimensions of the female threaded portion 63 are adjusted to a pitch a'' as shown in FIG. 7a.
1.44mm, thread angle b = 60°, root diameter c =
If the diameter is 22.5 mm and the inner diameter d is 20.94 mm, the mounting nut 62 can be screwed and fixed regardless of whether the male threaded portion 17 is of any of the above types.

Further, in order to be able to screw either of the two types of female threaded portions 16 into the male threaded portion 56, as shown in FIG.
The dimensions of the male thread portion 56 are pitch a' = 1.45 mm.
, thread angle b' = 60°, outer diameter C' = 21.6
mmφ, valley diameter d' = 22.5rIgnφ,
The mounting nut 15 can be screwed and fixed no matter which of the above female threaded portions 16 are used.

It should be noted that the above-mentioned numerical values are merely examples, and it goes without saying that it is desirable to take into account the type and dimensions of the screw as appropriate.

Therefore, when using the rotation detector 5 having the above configuration, the rotation transmitting shaft 2 has a circular hole 12 provided with an engagement groove 11 in the axial direction, and a radial direction that can be engaged with the engagement groove 11 is provided. In a rotation transmission mechanism in which a rotation transmission shaft 4 having a circular body portion 14 provided with a protrusion 13 is coupled, the circumferential rotation transmission shaft 2
, 4, when the rotation detector 5 is interposed and connected between them,
As shown in FIG. 9, the square hole 7 of the auxiliary connecting shaft 77
5 is fitted into the rectangular body portion 74 on one end side of the connecting shaft 70, and in this state, the one end side of the connecting shaft 70 is fitted into the rotation transmission shaft 2 having the circular hole portion 12, and at this time, the engaging groove The mounting nut 62 is screwed into the male threaded portion 17 by engaging the radial protrusion 73 in the rotation detector 11, thereby coupling one end of the connecting shaft 70 of the rotation detector 5 to the rotation transmitting shaft 2.

Further, the circular body portion 14 of the rotation transmission shaft 4 is fitted into the circular hole portion 72 on the other end side of the connecting shaft 70, and at this time, the radial protrusion 13 is engaged in the retaining groove 71, and the mounting nut 15 is fitted. is screwed into the male threaded portion 56 to connect the other end side of the connecting shaft 70 of the rotation detector 5 and the rotation transmission shaft 4.

Further, a rotation transmission shaft 2 having a square hole 22 and a rotation transmission shaft 4 having a square body 24 that can fit into the square hole 2 are provided.
In a rotation transmitting mechanism in which the rotation transmitting shafts 2 and 4 are coupled, when the rotation detector 5 is interposed and connected between the two rotation transmitting shafts 2 and 4, as shown in FIG. The other end of the shaft 70 is fitted into the circular hole 72, and in this state, one end of the connecting shaft 70 is fitted into the rotation transmission shaft 2 having the square hole 22, and the mounting nut 62 is inserted into the male thread 17. One end side of the connecting shaft 70 of the rotation detector 5 and the rotation transmission shaft 2 are connected by screwing into the shaft.

Further, the square body part 24 of the rotation transmission shaft 4 is fitted into the square hole part 75 of the auxiliary connection shaft 77 which is fitted into the circular hole part 72 on the other end side of the connection shaft 70, and the mounting nut 15 is screwed down. Threaded part 56
The other end side of the connection shaft 70 of the rotation detector 5 and the rotation transmission shaft 4 are connected by screwing into the rotation detector 5 .

Therefore, even when the structure of the rotation transmission mechanism is different, there is no need to prepare two types of rotation detectors 5 as in the conventional case, and it is possible to select the mounting location of the auxiliary connecting shaft 77 according to the structure of the rotation transmission mechanism. , it becomes possible to use rotation detectors 5 having the same structure.

In addition, although the above-described embodiment shows the case where the square body portions 24, 74 and the square holes 22, 75 have a rectangular cross section, they are not limited to such a cross section.

As described above, according to this invention, even if the coupling structures of the rotation transmission mechanisms are different, a rotation detector with a single structure can be interposed and connected to both, and the number of parts can be reduced by making them common. In addition, it is possible to reduce the number of man-hours, and the cost can be reduced, which is an excellent effect.

[Brief explanation of drawings]

FIG. 1 is a slope explanatory diagram of an automobile transmission in which this invention can be implemented, FIGS. 2 and 3 are cross-sectional explanatory diagrams of a rotation transmission mechanism including a conventional rotation detector, and FIG.
The figure is an explanatory cross-sectional view of a rotation detector equipped with a shaft structure according to an embodiment of this invention, FIG. 5 is a cross-sectional view taken along the line A-A in FIG. 4, and FIG. Explanatory diagram, Figure 7a
, b are enlarged cross-sectional explanatory diagrams of the female threaded part and the male threaded part of the rotation detector, respectively, FIG. 8 is an exploded perspective view of the main part of the rotation detector of FIG. 4, and both FIGS. 9a and 10a are FIG. 4 is a cross-sectional explanatory view showing a coupled state of the rotation detector, and FIGS. 9 and 10 are both enlarged slope explanatory views of the rotation transmission shaft. 2.4... Rotation transmission shaft 11... Engagement groove, 12... Circular hole, 13... Protrusion, 14... Circular body part, 22... Square hole part, 24... Square body part, 70... Connection shaft, 71... Engagement groove, 72... . . . circular hole, 73 . . . protrusion, 74 . . . square body, 75 . . . square hole, 77 .

Claims (1)

[Scope of utility model registration request] A rotation transmission shaft having a circular hole with an engagement groove in the axial direction and a rotation transmission shaft having a circular bar with a radial protrusion that can be engaged with the engagement groove, or a square hole. For a rotation transmission mechanism that performs rotation transmission by coupling a rotation transmission shaft having a section and a rotation transmission shaft having a square rod part that can fit into the square hole, a rotation transmission mechanism that transmits rotation between the joint parts of the circumferential rotation transmission shaft. In a rotation detector that detects the number of rotations of the connecting shaft by means of a rotation detecting means, the connecting shaft is interposed and connected to the connecting shaft, and one end side of the connecting shaft has a rectangular shape that can be fitted into the rotation transmitting shaft having the rectangular hole. The other end of the connecting shaft is formed into a rod portion, and the other end side of the connecting shaft is formed into a circular hole portion having an axial engagement groove into which a rotation transmission shaft having a circular rod portion provided with the radial protrusion is fitted. and a square hole having an outer shape that can be fitted into both the circular holes and has a radial protrusion that can be engaged with an engagement groove provided in the circular hole, and into which the both square rod parts can be fitted. an auxiliary connecting shaft having a circular hole, and in a state where the auxiliary connecting shaft is fitted into a rectangular rod portion on one end side of the connecting shaft, one end side of the connecting shaft can be coupled to the rotation transmission shaft having the circular hole portion. At the same time, the other end of the connecting shaft can be connected to the rotation transmission shaft having the circular rod portion, and with the auxiliary connecting shaft fitted into the circular hole on the other end of the connecting shaft, A shaft of a rotation detector, characterized in that one end side is connectable to the rotation transmission shaft having the square hole, and the other end side of the connecting shaft is connectable to the rotation transmission shaft having the square rod part. structure.