JPS6336426Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gear position detection device for a transmission, and more particularly to a position detection device that detects a gear position using a shift rod that is moved in conjunction with a shift lever.

In order to decelerate the rotation of the engine, automobiles are usually equipped with a transmission, and by operating the shift lever, the meshing of the gears in the transmission is changed, which allows various decelerations to be performed. The ratio output is transmitted to the drive wheels. Such a transmission is equipped with a microswitch that uses mechanical contact, for example, and this microswitch detects that the shift lever has been switched to the reverse state and activates the back clamp or buzzer. I'm trying to get it working. Furthermore, in vehicles that use an interlock so that the starter operates only when the transmission is in the neutral state, the neutral state is detected by a microswitch.

However, there are problems with the reliability of such microswitches that are opened and closed by mechanical contact. Also, conventional transmission gear position detection devices do not detect all transmission gear positions, but only detect whether the gear is in reverse or neutral as described above. Therefore, such conventional devices have the disadvantage that they cannot obtain the information necessary for electronic control of the engine and transmission.

The present invention was developed in view of these problems, and the purpose is to provide a highly reliable gear position detection device that can detect the gear position of all transmissions. That is.

In order to achieve this purpose, the present invention fixes a magnet along the circumferential direction and a magnet along the axial direction to the outer peripheral surface of the shift rod that slides and rotates in conjunction with the shift lever of the transmission. The length of the magnet along the circumferential direction is equal to or greater than the maximum rotational stroke of the shift rod, and the length of the magnet along the axial direction is equal to or greater than the maximum sliding stroke of the shift rod. I'm looking forward to it. Further, a sleeve surrounding the shift rod is provided, and Hall elements of the same number as the number of rotation stages of the shift rod are disposed on the inner peripheral surface of the sleeve in the circumferential direction,
The same number of Hall elements as the number of sliding stages of the shift rod are arranged in the axial direction. Then, the magnet along the axial direction is made to face the Hall element arranged in the circumferential direction, and the Hall element arranged in the circumferential direction is made to face the magnet along the axial direction, and then, means for determining the gear position of the transmission based on a combination of the outputs of the Hall elements disposed in the circumferential direction and the outputs of the Hall elements disposed in the axial direction and outputting a gear position signal; A transmission gear position detecting device is provided.

Therefore, when the shift rod moves based on the speed change operation by the shift lever, the combination of the output signals of the Hall elements disposed in the circumferential direction and the output signals of the Hall elements disposed in the axial direction changes. ,
Furthermore, since this combination is specified according to each shift position (gear position), all gear positions can be accurately detected. In addition, if a failure occurs in the Hall element or its signal processing means, the combination will be different from the normal gear position, so the failure can be reliably detected. Increased reliability.

Embodiments of the present invention will be described in detail below with reference to the drawings. 1 and 2 show a gear position detection device for a transmission according to this embodiment. It is movably mounted. When the shift lever of the transmission is operated, the shift rod 1 is thereby moved in the axial direction or rotated. And on the outer peripheral surface of the shift rod 1,
Magnets 2 and 3 are fixed to each other. Both magnets 2 and 3 are formed to have a length equal to or longer than the maximum sliding stroke of the shift rod 1 along the axial direction, as shown in FIGS. As shown in FIGS. 2 and 4, the shift rod 1 is provided with an extending portion 4 extending in the circumferential direction, and the length of the extending portion 4 is equal to or longer than the maximum rotational stroke of the shift rod 1. ing. That is, the magnet 3 without the extension 4 is formed in a straight line along the axial direction of the shift rod 1, and the magnet 2 with the extension 4 has a substantially T-shape in the developed view. Then, a sleeve 5 is attached so as to surround the part of the shift rod 1 to which the magnets 2 and 3 are fixed.
is fixedly placed. Seven Hall elements 6, 7, 8, 9, 10, 1 are arranged on the inner peripheral surface of the sleeve 5 so as to face the magnets 2, 3.
1 and 12 are attached.

The Hall elements 6, 7, 8, and 9 are arranged in a line in the axial direction, and are designed to detect the magnetic field generated by the extending portion 4 of the magnet 2. On the other hand, the Hall elements 10, 11, and 12 are arranged in a line in the circumferential direction together with the Hall element 8. The Hall element 10 is adapted to detect the neutral position by the magnet 2. Furthermore, the Hall elements 11 and 12 are connected to the magnet 3.
The detection output is obtained by the magnetic field of the sensor.

As shown in FIG.
It is connected to the connection point with 4. Further, the output terminals of the Hall elements 6 to 12 are connected to the bases of the transistors 16 to 22 via a resistor 15. The collectors of transistors 16 to 22 each have a resistor 2.
3 to the power supply terminal 24. Further, output terminals 26 to 32 are connected to the collectors of the transistors 16 to 22, respectively.

Next, the operation of the transmission gear position detection device having the above configuration will be explained. 1st
The positional relationship between the magnets 2 and 3 provided on the shift rod 1 and the Hall elements 6 to 12 attached to the sleeve 5 shown in FIG. It will look like Figure 4. In this figure, seven Hall elements 6
~12 are fixedly arranged at that position. On the other hand, magnets 2 and 3 move on this plane in response to the sliding and rotation of shift rod 1, respectively. The sliding movement of the shift rod 1 in the axial direction is caused by the movement of the magnets 2 and 3 in FIG.
This is a movement in the left and right direction. Also shift rod 1
The rotational movement causes the magnets 2 and 3 to move in the vertical direction in FIG. Therefore, the sliding position of the shift rod 1 in the axial direction is the four Hall elements 6 to 9.
and the extension portion 4 of the magnet 2. For example, in the illustrated state, the Hall element 8 generates an electromotive force. On the other hand, the rotational movement of the shift rod 1 is detected from the relative positional relationship between the magnets 2, 3 and the three Hall elements 10, 11, 12. In the illustrated state, the Hall element 10 generates an electromotive force.

Four Hall elements 6 to 9 for detecting the position of the shift rod 1 in the axial direction, and
Three Hall elements 1 that detect the position in the rotation direction of
The arrangement relationship between the numbers 0 and 12 and the shift position of the shift lever is as shown in FIG. That is, when the transmission is switched to the first speed, the Hall elements 9 and 11 generate an electromotive force, as is clear from FIG. Further, in the case of second speed, the Hall elements 8 and 12 generate an electromotive force. Next 3
In the case of high speed, the Hall elements 8 and 11 generate an electromotive force. Similarly, in the case of 4th speed, the Hall elements 7 and 12 generate an electromotive force, and in the case of 5th speed, the Hall elements 7 and 11 generate an electromotive force. In the case of 6th speed, the Hall elements 6 and 11 generate an electromotive force. Further, in the reverse state, the Hall elements 9 and 12 generate an electromotive force. Further, when the shift lever is in the neutral position and the transmission is in a neutral state, the Hall elements 8 and 10
will generate an electromotive force. Note that Hall element 1
Since 0 generates an electromotive force only in the neutral case, the output of the Hall element 8 is not necessarily required.

When any of the Hall elements 6 to 12 generates an electromotive force, this increases the base potential of the corresponding transistors 16 to 22. One or two will be energized depending on the gear position of the transmission. Therefore, the collector potential of this conductive transistor becomes approximately equal to the ground potential. That is, when one or two of the Hall elements 6 to 12 generate an electromotive force,
One of the corresponding output terminals 26-32 will be at a low level, thereby making it possible to obtain an electrical signal depending on the gear position of the transmission.

As described above, according to the transmission gear position detection device according to this embodiment, the magnets 2 and 3 are attached to the shift rod, and the Hall elements 6 to 9 are arranged in the axial direction on the sleeve 5.
Furthermore, Hall elements 10 to 12 are arranged in the circumferential direction, and the gear position of the transmission is determined by the combination of the detection outputs of the axial Hall elements 6 to 9 and the circumferential Hall elements 10 to 12. It becomes possible to detect. Moreover, Hall element 6~
12 generates an output by detecting the magnetic field of magnets 2 and 3 without contact, so it does not break down due to wear etc., and this increases the lifespan of the position detection device. By aiming at this, it becomes possible to improve reliability. Furthermore, since the Hall elements 6 to 9 and 10 to 12 are arranged in the axial direction and circumferential direction of the shift rod, respectively, it is possible to detect all gear positions of the transmission. Therefore, the detection output obtained by such a device is suitable for use in electronic control of an engine or transmission.

Although the present invention has been described above with reference to an illustrated embodiment,
The present invention is not limited to the above embodiments, and various modifications can be made based on the technical idea of the present invention. For example, the gear position detection device for a transmission according to the above embodiment is applied to a six-speed forward transmission, but the present invention can also be applied to other types of transmissions. Various design changes are also possible regarding the arrangement of Hall elements 2 and 3 and the Hall elements 6 to 12.

As described above, the present invention fixes a magnet to the outer periphery of a shift rod that is linked to a shift lever of a transmission, and also attaches a magnet to the axial direction and circumferential direction of the shift rod so as to face the magnet. The same number of Hall elements as the number of sliding stages and the number of rotation stages of the shift rod are arranged and fixed, and the gear position of the transmission is detected by a combination of the outputs of these Hall elements. Therefore, according to the present invention, it is possible to reliably detect the gear positions of all transmissions, and if a failure occurs in the Hall element or its signal processing means, the signal corresponding to the normal gear position can be detected. Since a signal of a different combination is outputted, the reliability of this type of gear position detection device is increased, as a failure can be reliably detected. Furthermore, since the magnet and the Hall element are used for non-contact detection, it is possible to obtain a gear position detection device with excellent reliability and durability.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a gear position detection device according to an embodiment of the present invention, and FIG.
3 is a circuit diagram of this gear position detection device, FIG. 4 is a developed plan view showing the positional relationship between the magnet and Hall element of this detection device, and FIG. 5 is a shift diagram of the Hall element and shift lever. FIG. 3 is a plan view schematically showing the relationship with position. In addition, in the symbols used in the drawings, 1...shift rod, 2, 3...magnet, 4...extension part,
5... Sleeve, 6-9... Hall element (axial direction), 10-12... Hall element (circumferential direction).

Claims (1)

[Scope of utility model registration request] A shift rod that slides and rotates in conjunction with a shift lever of a transmission, a sleeve that surrounds the shift rod, and a magnet that extends along an axial direction and is fixed to an outer peripheral surface of the shift rod.
A magnet extending along the circumferential direction fixed to the outer circumferential surface of the shift rod, and a number of rotating stages equal to the number of rotation stages of the shift rod arranged and fixed along the circumferential direction on the inner circumferential surface of the sleeve opposite to the magnet extending along the axial direction. a Hall element, a number of Hall elements arranged and fixed along the axial direction on the inner circumferential surface of the sleeve so as to face the magnet along the circumferential direction, and a number of Hall elements equal to the number of sliding stages of the shift rod; means for determining a gear position of the transmission based on a combination of the outputs of the Hall elements arranged along the axial direction and outputting a gear position signal; The length of the magnet along the axial direction of the shift rod is equal to or greater than the maximum sliding stroke of the shift rod, and the length of the magnet along the circumferential direction of the shift rod is equal to or greater than the maximum rotational stroke of the shift rod. A transmission gear position detection device characterized by having a length of .