JPH0781635B2 - Vehicle transmission detection device - Google Patents

Description

Description: “Industrial field of use” The present invention relates to a detection device used in a vehicle transmission that selects and shifts by receiving an electric command signal from an operation unit.

"Prior Art" Electrical control devices for vehicle transmissions are known.

FIG. 12 is a block diagram showing an example of this type of control device, in which 1 is an operation unit, 2 is an electric control circuit unit, and 3 is a transmission unit.

The operation unit 1 is of a finger type that can be operated by fingers, and an electric command signal generated from this is supplied to an electric control circuit unit 2 which operates the air cylinder 4 or 5 in accordance with the command signal. In order to do so, one of the electromagnetic valves 6a, 6b, 7a, 7b is controlled to open. In the air cylinder 4, the piston shaft 4a serves as a select shaft, and the forward / backward movement causes the transmission 8 to perform a select operation. In the air cylinder 5, the piston shaft 5a serves as a shift shaft. 8 is shifted.

Now, in such a control device, the air cylinders 4 and 5 are provided with the detection devices 9 and 10, and the respective shafts 4a and 5a are
In many cases, the operating state of the transmission 8 is detected based on the forward / backward movement of the transmission. That is, when the selection and shift of the transmission 8 are not in accordance with the command signal, the detection device 9,
Based on the detection signal from 10, it re-controls and shifts to the normal speed change state.

"Problems to be Solved by the Invention" The detection devices 9 and 10 provided in the above-described conventional control device are the selection shaft 4a and the shift shaft.
The detection element is an electric contact piece which is arranged so as to be in contact with each other at the advance / retreat position in association with the advance / retreat movement of 5a.

Such detection devices 9 and 10 are not necessarily suitable for this type of control device, which is frequently used, and are prone to malfunction due to wear, breakage, elasticity deterioration, etc. of the electrical contact piece.

The failure of the detection devices 9 and 10 cannot be discriminated even if the transmission 8 is in an unexpected shift state.
It appears as a phenomenon such as a malfunction or an inability to change gears, and is a serious problem with danger when the vehicle travels.

"Means for Solving Problems" The present invention has been made in view of the above circumstances, and an object of the present invention is to develop a detection device of this type of control device in which the detection element has a contactless structure and the device accuracy is improved.

Therefore, according to the present invention, the transmission unit for a vehicle that responds to an electric command signal from the operation unit unit is disposed adjacent to one end side in the axial direction of the transmission shaft for selecting and shifting the transmission. In a detection device for detecting whether or not the command signal is followed by a sensor case made of a non-magnetic material such as a synthetic resin material attached to a device fixing portion that fixes the detection device to the transmission main body, and this case. And a slit groove extending in the axial direction of the shaft, a magnetic sensitive element provided in an inside position of the case adjacent to the slit groove, and a case facing the magnetic sensitive element with the slit groove interposed therebetween. Insert the magnetic element provided inside, the output response circuit of the magnetic sensitive element provided inside the case, and a part of the speed change shaft or a part of the connecting member provided on the shaft. It is fixed to a shaft or a ring member rotatably provided on a connecting member and is extended into the slit groove, and the magnetic path between the magnetic sensitive element and the magnetic element is opened and closed according to the fluctuation of the speed-changing shaft. A detection device for a vehicle transmission including the magnetic shielding member thus configured and a guide member provided in the case for guiding the magnetic shielding member into the slit groove so as to slightly protrude from the groove edge is proposed.

According to the above description, the change of the speed change shaft is magnetically detected, and since the detection element that comes into contact with or separates from the magnetic field is not provided, a failure unlike the conventional detection device does not occur.

In addition, since the sensor portion including the magnetic element and the magnetic sensitive element is integrally incorporated in the sensor, stable detection output can be obtained. Further, if the sensor case has a waterproof structure, for example, moisture from the shifting shaft side can be obtained. In addition, oil can be prevented from entering, and each member in the case such as the magnetic sensitive element and this output response circuit is not affected by water and oil.

Further, since the guide member fixed to the sensor case guides the magnetic shield member, the ring body rotatably provided on the speed change shaft is kept non-rotatable.
The movement of the magnetic shield portion is linearly performed in the advancing / retreating direction of the speed change shaft, which greatly increases the accuracy of the device.

[Example] Next, an example of the present invention will be described with reference to the drawings. It should be noted that in the embodiments described below, a detecting device for detecting a change in the select shaft will be described, but the detecting device for detecting a change in the shift shaft has substantially the same configuration.

FIG. 1 is a vertical cross-sectional view of the detection device, and FIG. 2 is A- in FIG.
A sectional view taken along line A and FIG. 3 are plan views of the detection device showing a state in which the case lid and the circuit wiring board inside the sensor case are removed.

In these figures, 4a is a piston shaft of the air cylinder 4 for selecting the transmission 8, and 12 is a small diameter shaft portion integrally formed on the extension thereof. This small diameter shaft 12
Is displaced to three positions in the axial direction (lateral direction in FIG. 1) as a part of the select shaft.

The small-diameter shaft portion 12 may be formed separately and integrally fixed to the select shaft 4a by a known connecting means such as screwing.

A ring member 13 is rotatably fitted to the small-diameter shaft portion 12, and is prevented from coming off by an E-ring 14 that is locked to the tip of the small-diameter shaft portion 12.

The ring body 13 is provided with a flat surface portion 13a formed by cutting out the upper circumferential curved surface in the longitudinal direction, and the magnetic shield plate 15 is fixed to the flat surface portion 13a.

The magnetic shield plate 15 is a long magnetic plate member having a protruding portion 15a formed with a small width and protruding upward, and a plate portion integrally protruding left and right from the lower portion thereof is screwed to the flat surface portion 13a, as shown in the figure. It is upright so that

If an air cylinder whose piston shaft is non-rotatable is used, the small-diameter shaft portion 12 has a large diameter,
The magnetic shield plate 15 may be directly fixed to this.

Reference numeral 16 is a cylindrical fixed body which is concentric with the small-diameter shaft portion 12 and which is attached to the air cylinder 4 by screwing, and a rectangular hole with a frame is provided on the upper portion thereof so as to penetrate into the cylinder. The lower half of the sensor case 17 is installed in this rectangular hole.

The sensor case 17 is fixed to the fixed body 16 by screwing, and the projecting portion 15a of the magnetic shield plate 15 projects into the slit groove 18 provided on the bottom surface side.

The sensor case 17 is a box-shaped body made of synthetic resin or the like, and a step is formed at the bottom thereof as shown in FIG. 2, and a thin hanging wall 17a is provided between the upper bottom and the lower bottom. In addition, a downward convex portion 17b is provided on the upper bottom, and the slit groove 18 is formed by the convex portion 17b and the hanging wall 17a.

In the sensor case 17, a chip-shaped circuit board 19 made of a hybrid IC (HIC) is held by a holder 20 so as to be parallel to the hanging wall 17a. Then, as shown in FIG. 1 and FIG.
Magnetic sensitive elements 21a, 21b, 21c arranged at equal intervals are integrally provided toward the hanging wall 17a. These magnetic sensitive elements 21a, 21b, and 21c have their intervals set according to the three moving positions of the select shaft 4a, and the magnetic shield plate 15 is set in accordance with the moved position of the shaft 4a.
The projecting portion 15a of the above is opposed to any magnetic sensitive element.

The magnetic sensitive elements 21a, 21b, 21c described above may be publicly known ones, for example, Hall ICs can be used.

These magnetically sensitive elements 21a, 21b, 21c are electrically connected via a circuit board 19 to a circuit wiring board 22 arranged in the sensor hose 17.

The circuit wiring board 22 is connected to an external circuit, for example, the electric control circuit unit 2 by a cord 23 pulled out from the waterproof cord pull-out portion 17c. That is, the cord drawer portion 17c is composed of a grommet 24 and a washer 25 that are inserted into a tubular portion provided on one side of the sensor case 17, and a grommet retainer 26 that is screwed into the tubular portion and that holds the grommet 24 and washer 25. Therefore, it prevents the moisture that penetrates the cord 23 and enters the sensor case 17.

Further, the sensor case 17 described above is an internally sealed case by assembling the respective parts inside and then screwing the case lid 27 onto the upper part thereof.

On the other hand, the sensor case 17 is provided with small magnets 28a, 28b, 28c as magnetic elements inserted in the above-mentioned convex portion 17b.

These subtotal magnets 28a, 28b, 28c are exposed in the slit groove 18 at positions facing the magnetic sensitive elements 21a, 21b, 21c, as shown in the drawings.

That is, as shown in FIG. 4 and FIG. 6, the convex portion 17b of the sensor case 17 is provided with three through holes 17d arranged at equal intervals, and the small magnets 28a, 28b, 28c are inserted into each of them. At the same time, the holding magnets 29 shown in FIGS. 7 and 8 prevent the small magnets from coming off. In addition, the holding plate
29, the bent piece 29a is applied to the lower recess of the convex portion 17b,
It is a magnetic plate member that is screwed to one side (the side opposite to the slit groove 18).

Further, two guide plates 30a and 30b slightly protruding from the slit groove 18 are fixed to the lower part of the sensor case 17 by screwing so as to guide the magnetic shield plate 15.

The guide plates 30a and 30b described above are of the same shape, and each has an upper surface shown in FIG. 9 and a lower surface shown in FIG.

These guide plates 30a and 30b are provided on the bottom bottom of the sensor case 17 as shown by the phantom lines in FIGS.
However, the guide plates 30b are fixed to the parallel protrusions 17e integrally formed at the lower end of the convex portion 17b by screwing. In addition,
The recesses 31 provided in the guide plates 30a and 30b are fitted to the projections 17f formed on the lower bottom and the parallel protrusions 17e for positioning.

Next, the operation of the above detection device will be described. Assuming that the small-diameter shaft portion 12 is in the moving position shown in FIG. 1 and is in the state where the third speed and the fourth speed (see FIG. 12) are selected, at this operation stage, the small magnet 28b and the magnetically sensitive element 21b.
The magnetic path between and is closed by the projection 15a of the magnetic shield plate 15, and the other small magnets 28a and 28c and the magnetic sensitive elements 21a and 2a.
The magnetic path with 1c is opened. Therefore, the detection signal from the magnetically sensitive element 21b is sent to the electric control circuit unit 2.

The magnetic sensitive elements 21a, 21b, 21c are each connected to the response circuit shown in FIG. 11, and these circuits and circuit components are incorporated in the circuit board 19 in the sensor case 17.

As a result, when the detection signal of the magnetic sensitive element 21b is lowered due to the closing of the magnetic path, the comparator 33 which inputs the detection signal via the amplifier 32 inverts the output from low level to high level, and as a result, turns on the transistor 34. Is sent to the electric control circuit unit 2 as a detection signal.

The same is true when the detection signals of the magnetic sensitive elements 21a and 21c decrease, and the detection signals are sent out by the operation of the response circuit connected to these elements. Air cylinder 4 is first
When the first speed and the second speed are selected according to the command signal from the state shown in the figure, the small diameter shaft portion 12 is moved to the retracted position, and the magnetic shield plate 15 is projected between the small magnet 28a and the magnetic sensitive element 21a. The portion 15a is displaced, and in this operation stage,
A detection signal from the magnetically sensitive element 21a is sent.

Similarly, the air cylinder 4 causes the fifth signal to follow the command signal.
When operating to select speed or back, the protrusion 15a of the magnetic shield plate 15 is displaced between the small magnet 28c and the magnetic sensitive element 21c due to the advance of the small-diameter shaft portion 12, so that the detection signal by the magnetic sensitive element 21c is detected. Will be sent.

As described above, as long as the transmission 8 normally performs the select operation according to the command signal, the confirmation processing is performed by the electric control circuit unit 2.

Further, even if the command signal is the back signal, when the air cylinder 4 does not operate and the small diameter shaft portion 12 maintains the position shown in FIG. 1, the detection signal from the magnetically sensitive element 21c is received. However, since the detection signal of the magnetically sensitive element 21b is received, it is immediately determined that the electrical control circuit unit 2 is malfunctioning, and correction processing such as recontrol is performed.

In any case where the select operation of the transmission 8 does not follow the command signal, it is not possible to maintain a proper correlation between the magnetically sensitive elements 21a, 21b, 21c and the protrusion 15a of the magnetic shield plate 15. The above-described malfunction determination and correction processing are performed.

Further, in the above-described detection device, since the magnetic shield plate 15 is guided by the two guide plates 30a and 30b and fluctuates, the ring body is changed.
13 is kept non-rotatable, the protruding portion 15a of the magnetic shield plate 15 is accurately displaced between each small magnet and the magnetic sensitive element, and the small diameter shaft portion 12 is rotated with respect to the ring body 13. Since it is movable, it does not affect the operation of the air cylinder 4.

On the other hand, the detection device for detecting the variation of the shift shaft has the same configuration as that of the selection detection device described above, and the shift shaft moves back and forth in accordance with the command signal to cause the transmission 8 to move. When the shift operation is performed, the magnetic shield plate normally faces each magnetic sensitive element, and when the shift operation does not follow the command signal, the regular facing relationship between the magnetic shield plate and each magnetic sensitive element cannot be achieved. The electric control circuit unit 2 performs the determination and the processing operation.

For example, assuming that the select detection signal is normal and the shift detection signal is an erroneous signal, the chain lever becomes resistanceless according to the above processing operation. As a result, the driver recognizes that the shift operation is not normal because the sense of operating the lever is lost, and the shift operation is performed again.

In the above embodiment, the transmission 8 having five forward gears and one reverse gear is used.
Although the detection device used for the above is described, the number of small magnets and the magnetically sensitive elements and the arrangement thereof may be configured in accordance with the number of shift stages for a transmission having a different number of shift stages. It can be carried out.

Further, in the above embodiment, the position of the speed changing shaft is detected from the detection signal of the magnetically sensitive element whose magnetic path is closed by the protrusion 15a of the magnetic shield plate 15. Therefore, a magnetic shield plate that opens the magnetic path of any one of the magnetic sensitive elements may be provided, and the output signal of the magnetic sensitive element with the open magnetic path may be used as the detection signal.

[Advantages of the Invention] As described above, according to the present invention, the magnetic sensor portion including the magnetic element and the magnetic sensitive element is fixed to the sensor case,
Since the magnetic path between the above-mentioned elements is closed or opened for detection according to each moving position of the speed change shaft, a stable detection signal of transmission select and shift is obtained, and the electric contact piece is Compared with the conventional devices equipped with it, there are far fewer failures, and it is highly safe as a device equipped on a vehicle.

In addition, since the magnetic element and the magnetic sensitive element, and their response circuits are built into the sensor case that can be detachably attached to the device fixing part, it is easy to maintain and inspect the device or replace the sensor part and other parts. At the same time, the magnetic sensitive element and its response circuit can be formed as a hybrid IC to provide a detection device less affected by noise.

Further, in the present invention, since the guide member for guiding the magnetic shield member is provided, the ring member is kept non-rotatable by the guide member, and the magnetic shield member can be smoothly moved and displaced to a predetermined position. Therefore, the accuracy of the device can be improved. As in the above-mentioned embodiment, the sensor case 17 has a waterproof structure for the cord drawer portion 17c.
If is sealed, the ingress of water and oil from the shift shaft side and the infiltration of water from the drawer portion 17c are prevented, and the reliability of each component in the sensor case 17 is maintained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a detection device according to the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 is a state in which a case lid and a circuit wiring board inside a sensor case are removed. FIG. 4 is a plan view of the above detection device, FIG. 4 is a side view of the sensor case,
FIG. 5 is a bottom view of the sensor case, FIG. 6 is a sectional view taken along line BB in FIG. 4, FIG. 7 is a front view of a holding plate for holding a small magnet, and FIG. 8 is a right side of the holding plate. Fig. 9 is a plan view of the guide plate, Fig. 10 is a bottom view of the guide plate, Fig. 11 is a view showing a response circuit connected to the magnetically sensitive element, and Fig. 12 is a control device of the transmission. FIG. 7 is a block diagram showing a conventional example of FIG. 12 …… Small-diameter shaft part, 13 …… Ring body 15 …… Magnetic shielding plate, 15a …… Projection part 17 …… Sensor case, 17a …… Suspending wall 17b …… Convex part, 18 …… Slit groove 19… ... Circuit board, 20 ... Holders 21a, 21b, 21c ... Magnetic sensitive elements 28a, 28b, 28c ... Small magnets 30a, 30b ... Guide plates.

Claims (1)

[Claims] 1. A transmission unit for a vehicle, which is responsive to an electric command signal from an operation unit, is disposed adjacent to one end side in the axial direction of a transmission shaft, and selects and shifts the transmission. In a detection device for detecting whether or not a signal is followed, a sensor case made of a non-magnetic material such as a synthetic resin material attached to a device fixing portion for fixing the detection device to the transmission main body, and a sensor case formed on this case. The slit groove extending in the axial direction of the shaft, the magnetic sensitive element provided in a position inside the case adjacent to the slit groove, and the inside of the case so as to face the magnetic sensitive element with the slit groove interposed therebetween. The magnetic element provided, the output response circuit of the magnetic sensitive element provided in the case, and a part of the speed changing shaft or a part of the connecting member provided on the shaft are axially inserted into the shaft. Alternatively, it is fixed to a ring body that is rotatably provided on the connecting member and is extended into the slit groove, and the magnetic path between the magnetic sensitive element and the magnetic element is opened and closed according to the fluctuation of the speed change shaft. The magnetic shielding member,
A detection device for a vehicle transmission, comprising: a guide member that is provided in the case and that guides the magnetic shield member so as to slightly project from a groove edge into the slit groove.