JPS6145489Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotation detection device that detects the rotation of the rotation shaft by directly connecting the sensor shaft of a rotation sensor to the rotation shaft of a vehicle transmission or the like.

An example of a conventional rotation detection device of this type is as shown in FIG. That is, 10 is a housing of a vehicle transmission, and has a rotation outlet 20 having a screw 20a provided on the outer circumferential surface.
is installed protrudingly. Furthermore, an output rotation shaft 30 for rotation detection, which has a square hole 301 bored at its end, is led out of the rotation outlet 20.

On the other hand, 40 is an oscillation type rotation sensor, and this rotation sensor 40 outputs the rotation input through the sensor shaft 406 as an intermittent oscillation. Lower case 402 to be fitted,
A rotor shaft 40 is rotatably supported within the Atsupa case 401 via a bearing 404.
3. A rotation detection rotor 405 made of a pair of U-shaped magnetic bodies and fixed to the base end of the rotor shaft 403 so as to be orthogonal to each other, and the rotor shaft 403
an oscillation coil 408 fixed to a printed circuit board 407 installed in the cases 401 and 402 and provided corresponding to the rotation detection rotor 405; A signal output line 409 is drawn out from the printed circuit board 407 to the outside of the cases 401 and 402, a screw 20 is rotatably supported by a sleeve 410 attached to the upper case 401, and is formed in the rotation output port 20.
The sensor shaft 406 is made up of a union nut 411 having a screw 411a screwed onto the shaft 411a. Since the length of the sensor shaft 406 is not formed over the entire length of the rotation sensor 40 and the length of the sensor shaft 406 is short, the effect of making the sensor shaft 406 flexible;
That is, when connecting the rotation sensor to the rotation outlet,
Even if there is some misalignment between the rotating shaft and the sensor shaft, the sensor shaft will flex and deform to absorb the misalignment and prevent stress from being applied to the bearings such as the sensor shaft. There was a problem that the intended effect could not be fully demonstrated.

The present invention was developed by focusing on these conventional problems, and has a structure in which a flexible sensor shaft is pivotally supported near the end opposite to the end connected to the rotation output port of the rotation sensor. It is an object of the present invention to provide a rotation detection device that can solve the above-mentioned problems by having a flexible sensor shaft that spans the entire length of the rotation sensor.

The present invention will be explained in detail below based on the embodiment shown in FIGS. 2 and 3.

Embodiment In FIG. 2, reference numeral 10 denotes a housing of a vehicle transmission, and this housing 10 is formed with a rotation outlet 20 having a screw 20a on its outer circumferential surface. An end portion of an output rotating shaft 30 for rotation detection is located inside. A non-circular shaft hole 02 consisting of a center hole 302a and a slit 302b and into which a sensor shaft to be described later is engaged is bored at the end of the output rotating shaft 30.

Reference numeral 50 is a power-generating rotation sensor that outputs the rotation input through the sensor shaft 506 as an AC power signal. ,
It is configured to be divisible so that the following components can be stored inside. A support frame 502 is made of a non-magnetic material and is fixed inside the case 501. Reference numeral 503 denotes a rotor shaft, which includes a shaft insertion hole 503a having an inner diameter larger than the outer diameter of a sensor shaft 506, which will be described later, and a small-diameter square hole 5 into which an angled portion 506c at the base end of the sensor shaft is inserted and fitted.
03b, and is rotatably supported by a magnetic bearing 504 fixed to a support frame 502.
A rotation detection rotor 505 is made of a gear-shaped magnetic material whose tooth tips are curved in the axial direction, and is fixed to the rotor shaft 503. 506 is a shaft insertion hole 503 formed in the rotor shaft 503.
The flexible sensor shaft 506 is inserted with its tip left inside a, and the tip of this flexible sensor shaft 506 has a
Slit 302b of the shaft hole 302 of the rotating shaft 30
A joint portion 506b having a protrusion 506a that is engaged with the rotor shaft 503 is provided at its base end, and a cornered portion 506c that is inserted and fitted into the square hole 503b at the base end of the rotor shaft 503 is provided. ing. 507 is a coil, and the coil bobbin 50
The rotation sensor 50 generates an electromotive force due to changes in the magnetic flux passing through it, and is taken out as the output of the rotation sensor 50. 509 is magnet, 51
0 and 511 are a pair of yokes made of magnetic material, and the magnet 509 is held between their base ends. Further, at the tip of one of the yokes 511, a tooth tip 511a opposing the tooth tip of the rotor 505 is integrally formed. 5
Reference numeral 12 denotes a connecting portion, which is formed integrally with the case 501, and furthermore, a screw 512a is formed on the inner peripheral surface to be screwed into the screw 20a formed on the outer periphery of the rotation outlet 20.

The above is the configuration of this embodiment.Next, its operation will be described. First, in order to connect the rotation sensor 50 to the rotation outlet 20 of the transmission housing 10, the center hole 302a of the output rotation shaft 30 must be connected to the rotation sensor 50.
After inserting the joint portion 506b and the punching projection 506b of the sensor shaft 506 into the slit 302b, the screw 512a of the connecting portion 512 of the rotation sensor 50 is screwed into the screw 20a of the rotation outlet 20 for connection. When the output rotating shaft 30 inside the transmission housing 10 rotates, the sensor shaft 506 rotates due to this rotational force, and the rotation detection rotor 505 rotates accordingly. When this rotation detection rotor 505 rotates, the magnet 50
9 → Yoke 510 → Bearing 504 → Rotor shaft 503
→ Rotor 505 → Yoke 511 → Magnet 50
9 changes, and the electromotive force output from the coil 507 changes in accordance with the rotation speed of the rotation detection rotor 505. Therefore, the rotation of the output rotating shaft 30 can be detected. It is something. Therefore, according to this embodiment, the sensor shaft 50
6 is the long axis located over the entire length of the rotation sensor 50, and since the sensor shaft 506 is rotationally connected to the rotor shaft 503 at its base end, the tip of the sensor shaft 506 In other words, the amount of deflection deformation in the eccentric direction of the joint portion 506b is large, and when the rotation sensor 50 is connected to the rotation outlet 20 of the transmission housing 10, the output rotation shaft 30 and the sensor shaft are Even if there is a relatively large misalignment between the sensor shaft 506 and the rotary shaft 30, the flexibility of the sensor shaft 506 can effectively absorb the misalignment. In addition to making the engagement connection easy and reliable, the sensor shaft 5
This has the effect of suppressing the wear of bearings that are subject to damage such as 06.

Embodiment In FIG. 3, this embodiment is an embodiment in which an inner shaft 601 of a flexible cable 60 such as a speedometer cable is used as a flexible sensor shaft. That is, the inner shaft 601 has an angular section 601a that is machined, the base end of this angular section 601a is engaged with a square hole 503b of the rotor shaft 503, and the tip of this angular section 601a is engaged with a square hole 503b of the rotor shaft 503. teeth,
It is fitted into a square hole 601c formed in a joint member 601b that engages with the shaft hole 302 of the output rotation shaft 30. 602 is a sleeve, 60
3 is a union nut for fastening the flexible cable 60 to the case 501 of the rotation sensor 50 in cooperation with the sleeve 602; A screw 513a formed on the outer peripheral surface of the portion 513
A screw 603a is formed to be screwed into. The rest of the structure is the same as that of the first embodiment, so the same reference numerals as those of the first embodiment are given, and the explanation of the structure will be omitted.

As described above, in this embodiment, the base end of the flexible inner shaft 601 is rotatably coupled to the square hole 503b of the rotor shaft 503, so this embodiment also applies to the first embodiment. Similarly, since the deflection amount in the eccentric direction of the inner shaft 601 becomes large, when connecting the rotation sensor 50 to the rotation outlet 20 of the transmission housing 10, the output rotation shaft 30 and the inner shaft which is the sensor shaft are Even if there is a relatively large misalignment between the sensor shaft 601 and the sensor shaft 601, the flexibility of the sensor shaft 601 can effectively absorb the misalignment, and the rotating shaft 30
The engagement and connection between the sensor shaft 601 and the sensor shaft 601 can be made easy and reliable, and damage, wear, etc. to the bearings of the sensor shaft and the like can be effectively suppressed.

As described above, the present invention provides a non-circular shaft hole 302 concentric with the rotation shaft 30 at the end of the rotation shaft 30 led out to the rotation outlet 20 of the housing 10,
The rotation sensor 50 has a sensor shaft 506, 601 inserted into the shaft hole 302 and rotationally coupled to the rotation shaft 30, and detects the rotation of the rotation shaft 30 by the sensor shaft 506, 601. The rotation detection device is connected to the outlet 20, and the sensor shafts 506, 601 are connected to the rotation sensor 50.
is disposed so as to be substantially coaxial with the rotation shaft 30 when connected to the rotation output port 20, and is located near an end opposite to the connection end of the rotation sensor 50 to the rotation output port 20. Since this rotation detection device is characterized by being composed of a pivotably supported flexible member, the sensor shaft has a structure that maintains flexibility, and the rotation sensor has a structure that maintains flexibility. Since it has a free end that extends at least the entire length, when the housing 10 such as a transmission and the rotation sensor 50 are connected, the rotation shaft 30 in the housing 10 and the sensor shaft 506 of the rotation sensor 50 , 601, the sensor axis 50
The flexibility of the rotation shaft 30 and the sensor shaft 506, 6 effectively absorbs the above-mentioned misalignment due to the flexibility of the shaft 506, 601.
This has the effect of not only making the engagement connection with 01 easy and reliable, but also suppressing wear of the bearings such as the sensor shaft.

Furthermore, according to the second embodiment, in addition to the above effects,
Inner shaft 6 of flexible cable 60 as sensor shaft
01 is commonly used, the number of parts can be reduced, and the rotational force for detecting the rotational speed and the rotational force for driving external equipment such as a speedometer can be taken out from one rotation outlet 20. This has the effect of reducing the amount of space it occupies.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing a conventional rotation detection device.
FIG. 2 is a sectional view showing a first embodiment of the rotation detecting device according to the present invention, and FIG. 3 is a sectional view showing a second embodiment thereof. 10...transmission housing, 20
... Rotation outlet, 20a ... Screw, 30 ... Output rotation shaft, 302 ... Shaft hole, 302a ... Center hole,
302b...slit, 50...rotation sensor, 5
01...Case, 502...Support frame, 50
3...Rotor shaft, 503a...Shaft insertion hole, 503
b... Square hole, 504... Bearing, 505... Rotation detection rotor, 506... Sensor shaft, 506a... Embossed protrusion, 506b... Joint part, 506c
... Corner section, 507 ... Coil, 508 ... Coil bobbin, 509 ... Magnet, 510,5
11...Yoke, 511a...Tooth tip, 512...
Connection part, 512a...screw, 513...connection part,
513a...screw, 60...flexible cable, 6
01...Inner shaft, 601a...Corner part, 60
1b...Joint member, 601c...Square hole, 6
02...Sleeve, 603...Union nut,
603a...screw.

Claims (1)

[Claims for Utility Model Registration] 1. A non-circular shaft hole 302 concentric with the rotation shaft 30 is provided at the end of the rotation shaft 30 led out to the rotation outlet 20 of the housing 10, and the shaft hole 302 is inserted into the shaft hole 302. The sensor shafts 506, 601 are rotatably coupled to the rotating shaft 30, and the sensor shafts 506, 601 are
601 is a rotation detection device in which a rotation sensor 50 for detecting the rotation of the rotation shaft 30 is connected to the rotation outlet 20, and the sensor shafts 506, 601 detect the rotation of the rotation sensor 50. A shaft support is disposed so as to be substantially coaxial with the rotation shaft 30 when connected to the rotation output port 20, and is provided near an end of the rotation sensor 50 opposite to the connection end to the rotation output port 20. A rotation detection device comprising a flexible member. 2 The sensor shaft 601 made of the flexible member is
The rotation shaft 3 is connected to the rotation sensor 50.
Flexible cable 6 for extracting 0 rotation to external equipment
The rotation detecting device according to claim 1, characterized in that the inner shaft 601 is 0.