JPS6123807Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotation detection device for a rotating body, and is particularly suitable for a device for detecting the rotation speed of an output shaft in an engine testing device where engines are frequently replaced.

In engine testing, one method of measuring engine rotational speed is to detect the high voltage of the ignition coil, but since the number of pulses per revolution is small, the accuracy is low, and diesel engines do not have spark plugs. There are drawbacks such as the inability to measure. Therefore, in general, as shown in Figures 1 to 3, an electromagnetic pickup 1, which is one of the sensors, is used.
For example, the detection part 2 at the tip is formed on a flywheel 4 which is a rotating body of an engine 3, and is attached to a clutch housing 6 (casing) so as to face a starter ring gear 5 which is a sensing part, and is connected to the rotation of the ring gear 5. A method is adopted in which the rotational speed of the engine 3 is determined by reading the pulses of the electromagnetic pickup 1 received by the motor. However, in this method, when the detection part 2 at the tip of the electromagnetic pickup 1 is fixed close to the ring gear 5, the ring gear 5 cannot be seen from the outside due to the clutch housing 6, so it is necessary to adjust the gap between the detection part 2 and the ring gear 5. It is difficult to do this, and especially in this test, the engine 3 will be replaced frequently, so if you try to remove the clutch housing 6 from the engine 3 while the electromagnetic pickup 1 is fixed to the clutch housing 6, the detection part 2 will detect whether the ring gear 5 or the flywheel 4 There is a risk of damage due to contact with the clutch housing 6.
The engine 3 must be replaced by taking it out from the ring gear 5 or by separating it from the ring gear 5.
After replacing engine 3, the electromagnetic pick-up 1 will be turned on again.
This causes an extremely troublesome problem in that the clearance between the ring gear 5 and the ring gear 5 must be adjusted.

Therefore, the present invention solves these problems and allows the clutch housing 6 to be removed from the engine 3 without damaging the detection part 2.
It is an object of the present invention to provide a rotation detecting device that can be used as a device that can easily maintain an optimal gap between a detecting part 2 and a ring gear 5, which has been adjusted once, even after replacing an engine 3.

The configuration of the present invention to achieve such an object is such that a support member is fixed to a casing that accommodates a rotating body, and a sleeve onto which a sensor is screwed so as to be able to adjust its protrusion amount is attached to the support member so that the sensor can be attached to the rotating body. facing and slidably supported in the opposing direction,
A pressing member that constantly presses the outer circumferential surface of the sleeve is attached to the supporting member, and a recess for attaching and detaching that the pressing member can engage when the rotating body is attached to and detached from the casing, and rotation detection of the rotating body are provided. The present invention is characterized in that a detection recess into which the pressing member can engage is formed on the outer circumferential surface of the sleeve along the opposing direction.

Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. This example also specifically explains the case where the rotation detection device is applied to an engine testing device.
The same parts as in the conventional example described above will be described using the same reference numerals. In FIG. 4, which is a cross-sectional view showing a structure in which an electromagnetic pick-up, which is one of the sensors, is attached to a flywheel so as to be able to reciprocate in a pair with the device according to this embodiment, and in FIG. A cylindrical sleeve 10 that is integrally screwed with the sleeve 10 is slidably fitted to a support member that supports the sleeve 10, and the inner circumference of the support member 11 has a hole bored in the radial direction. A steel ball 14 (pressing member) that constantly presses the outer peripheral surface of the sleeve 10 by the force of a spring 13 is slidably inserted into the sleeve 12 .

Hole 1 formed in the inner peripheral part of the above-mentioned support member 11
The number of holes 2 does not have to be one, and the direction of the holes 12 does not necessarily have to be oriented in the radial direction of the support member 11. In short, it is sufficient that the steel balls 14 can press the outer peripheral surface of the sleeve 10. Further, the method of pressing the outer peripheral surface of the sleeve 10 by the pressing member is not limited to the above-mentioned method. A rubber-like elastic body (not shown) is inserted into the hole 12 provided in the inner peripheral part of the support member 11 so that the tip thereof slightly protrudes from the inner peripheral part. Other methods such as packing in as much space as possible can also be considered. There are no limitations on the shapes of the sleeve 10 and the support member 11 as long as they can be slidably fitted thereto. The upper part of the outer peripheral surface of the sleeve 10 corresponds to the shape of the steel ball 14 that engages with the steel ball 14 to position the electromagnetic pick-up 1 close to the flywheel 4 when detecting the rotation of the flywheel 4. An annular detection recess 15 is provided. Similarly, a steel ball 14 is engaged with the lower part of the outer peripheral surface of the sleeve 10 to keep the electromagnetic pickup 1 away from the flywheel 4 when the engine 3 is attached to or removed from the clutch housing 6 (casing). An annular attachment/detachment recess 15a corresponding to the shape of the steel ball 14 is provided for positioning. These recesses 15 and 15a do not need to be formed in an annular shape, and a recess-like recess may be formed in a portion of the outer peripheral surface of the sleeve 10 along the axial direction of the sleeve 10. The support member 11 to which the electromagnetic pick-up 1 is slidably attached is configured such that the electromagnetic pick-up 1 can freely reciprocate while facing a starter ring gear 5 formed on the flywheel 4 and used as a sensed part. , is attached to the center of a notch hole 16 provided in the clutch housing 6 via a mounting bracket 17. Note that the support member 11 may be directly fixed to the clutch housing 6.

When detecting the rotational speed of the flywheel 4 using this device, the sleeve 10 is lowered together with the electromagnetic pickup 1 as shown on the left side in the figure, the steel ball 14 is fitted into the detection recess 15, and the detection part 2 is opened. Although this is done while the ring gear 5 is positioned close to the ring gear 5, the amount of protrusion of the detection part 2 from the sleeve 10 is adjusted by adjusting the gap between the ring gear 5 and the detection part 2 in advance, and by adjusting the screws between the electromagnetic pick-up 1 and the sleeve 10. After adjustment, the electromagnetic pick-up 1 is integrally fixed to the sleeve 10 with a lock nut 18, and when replacing the engine 3, the sleeve 10 is shown on the right side of the figure together with the electromagnetic pick-up 1. This is done in a positioning state in which the steel ball 14 is fitted into the attachment/detachment recess 15a. In this state, the detection part 2 is separated from the flywheel 4, so there is no risk of damage. After replacing the engine 3, simply lower the electromagnetic pick-up 1 again, and the ring gear 5 obtained by adjusting the screws
The rotation of the flywheel 4 can be detected with an optimum gap between the flywheel 4 and the detection unit 2.

In this embodiment, the present device is applied to an engine testing device, but of course other rotating bodies can also be used, and the sensor may be installed anywhere as long as it faces the rotating body. The surface of the rotating body facing the sensor may be provided with one sensing portion corresponding to the sensor, such as a convex portion, at the bottom.

As explained in detail above, the detection device of the present invention can freely approach and leave the rotating body.
Furthermore, since the sensor can be easily positioned using the pressing member between the detection recess and the attachment/detachment recess, there is no risk of damage to the sensor when replacing the rotating body, and gap adjustment is also possible once the sensor has been lowered. If you do it in the current state, you won't need to do it later.
Work efficiency will be much better than before.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a state in which a conventional rotation detection device is attached to an engine testing device, Fig. 2 is a schematic cross-sectional view of the mounting part of the rotation detection device, and Fig. 3 is an enlarged explanatory view of the device. FIG. 4 is a sectional structural view of one embodiment of the rotation detecting device according to the present invention, in which the left half shows the state when detecting the rotation of the flywheel, the right half shows the state when replacing the engine, and the left half shows the state when replacing the engine. The figure is a plan view of FIG. 4. In the drawing, 1 is an electromagnetic pickup, 2 is a detection part,
4 is a flywheel, 5 is a ring gear, 6 is a clutch housing, 10 is a sleeve, 11 is a support member, 12 and 16 are holes, 13 is a spring, 14 is a steel ball,
15 is a detection recess, and 15a is an attachment/detachment recess.

Claims (1)

[Scope of utility model registration request] A support member is fixed to a casing that accommodates a rotating body, and a sleeve onto which a sensor is screwed so that its protrusion amount can be adjusted is attached to the support member so that the sensor faces the rotating body and can freely slide in the opposing direction. a pressing member that constantly presses the outer circumferential surface of the sleeve is attached to the supporting member, and an attachment/detachment recess with which the pressing member can engage when the rotating body is attached to and detached from the casing, and the rotating body 2. A rotation detection device characterized in that a detection recess into which the pressing member can engage when detecting the rotation of the sleeve is formed on the outer circumferential surface of the sleeve along the opposing direction.