JPH1159217A - Shift position detecting device of multistage transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the gear position without an error by including a second contact element and a contact element for grounding which come into contact with one of plural first elements. SOLUTION: This device includes a gear box switch GPS, a second contact element (contact for current application), an element for grounding (contact for grounding) 21, and a control unit. Plural different resistances R1-R5 corresponding to plural speed change gears of multistage transmission are mounted on a board of the GPS, and first contacts 26, 26a-26d for first speed to fifth speed are respectively wire-connected to the resistances R1-R5. In this arrangement, in the case of detecting the gear position, when a gear shaft cam is turned in a designated degree to perform gear shift, a current application contact is brought into contact with one of the contacts 26, 26a-26d of the GPS corresponding to the above gear shifting, a signal of an A/D converter 33 is given, and the signal is processed. At this time, as the resistance value varies with the gear position, the voltage of the A/D converter 33 is changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift position detecting device for a multi-speed transmission used for various motorcycles.

[0002]

2. Description of the Related Art A motorcycle (not shown) transmits power of an engine to a rear wheel by using a continuously meshing multi-stage transmission 15 and increases or decreases the speed. Is detected by the shift position detecting circuit 18 as shown in FIGS.

In the multi-stage transmission 15, a gear shift cam 16 is supported by an engine case 4a via a bearing 17, and the gear shift cam 16 rotates at a predetermined angle to perform a gear shift. Further, the shift position detecting circuit 18 includes a gear position switch (hereinafter abbreviated as GPS) 19, an energizing contact 20, and a control unit 22, and has a circuit configuration as shown in FIG. The ground is provided via an engine ground 23.

[0004] The GPS 19 is mounted on the engine case 4a and faces the end face of the gear shift cam 16. A printed circuit board 25 is mounted on the concave portion 24 on the surface of the GPS 19, and the printed circuit board 25 has resistors R1, R2, R3, R4,
R5 is implemented. The plurality of resistors R1, R2, R
3, R4, R5 have different resistance values from each other,
6, 26a, 26b, 26c, 26d. A plurality of contacts 26, 26a, 26b, 26c, 26d
Are embedded in the GPS 19 in a substantially semicircular arc shape, and face the end face of the gear shift cam 16. Note that GPS1
A neutral contact 27 is buried in the facing region 9 together with a plurality of contacts 26, 26a, 26b, 26c, 26d, and the neutral contact 27 is connected to a power source B via a neutral lamp 28.

The energizing contact 20 is inserted into a mounting hole 29 on the end face of the gear shift cam 16 via a coil spring 30 so as to be able to move forward and backward, and faces the back surface of the GPS 19. The mounting hole 29 is formed at a position shifted radially outward from the center of the end face of the gear shift cam 16. Therefore, the energizing contact 20 is turned into a plurality of contacts 26, 26a, 26b, 2
6c, 26d and one of the neutral contacts 27 are contacted by being resiliently pressed. Further, the control unit 22 is an analog / digital converter (hereinafter abbreviated as an A / D converter) of an internal circuit of an igniter (not shown).
33, and a pull-up resistor 34, and a plurality of resistors R
1, R2, R3, R4, R5.

Accordingly, when the gear shift cam 16 is rotated at a predetermined angle to perform a gear shift, the contacts 26, 26a, 26b, 26c, 26 corresponding to the gear shift are performed.
The current-carrying contact 20 contacts d (any one of them), and a signal is output to the A / D converter 33. On this occasion,
Since the resistance value differs depending on the gear position, the voltage of the A / D converter 33 changes, and the gear position is detected based on the change. Japanese Patent Application Laid-Open No. 2-107 discloses a prior art document relating to a shift position detecting device of this type of a multi-stage transmission.
No. 867 and the like.

[0007]

In the conventional shift position detecting device for a multi-stage transmission, the gear shift cam 16 is supported by the engine case 4a via the bearing 17 as described above. there were. That is, the engine case 4a and the gear shift cam 16 come into complete contact with each other by screwing or spring pressure, and there is no problem if the contact resistance is small. The contact resistance with the cam 16 may increase. When the contact resistance increases,
The input voltage of the A / D converter 33 becomes unstable, and as a result,
There is a possibility that detection of the gear position may be erroneously recognized.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has no problem in detecting the gear position regardless of the magnitude of the contact resistance between the engine and the gear shift member. It is intended to provide a device.

[0009]

According to the first aspect of the present invention, to achieve the above object, a multi-stage transmission that switches a transmission gear by rotating a gear shift member at a predetermined angle, and a transmission of the multi-stage transmission are provided. And a shift position detecting means for detecting a position, wherein the shift position detecting means corresponds to a plurality of shift gears of the multi-stage transmission, and is substantially halfway at a non-central portion of an end face of the gear shift member. A plurality of first contact elements arranged in an arc shape and facing each other; and a second contact element provided at a non-center portion of an end face of the gear shift member and contacting any one of the plurality of first contact elements by rotation of the gear shift member. It is characterized in that it comprises a contact element and an earth contact provided on an axis including a central portion of the gear shift member to make the gear shift member an earth potential.

According to the first aspect of the present invention, when detecting the shift position, even if the engine and the gear shift member are not in contact with each other or the contact resistance cannot be reduced, the ground contact of the shift position detecting means can be used. Since the gear shift member is forcibly set to the ground potential via a harness or the like, it is not necessary to pay attention to the magnitude of the contact resistance. Therefore, there is no possibility that the shift position is erroneously determined by making the potential equal to the reference potential.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the figure, reference numeral 1 denotes a motorcycle. The motorcycle 1 includes a multi-stage transmission 15 and a shift position detection circuit 1 for detecting a shift position of the multi-stage transmission 15.
8A are provided respectively.

As shown in FIG. 4, the motorcycle 1 includes a frame 2 having excellent rigidity made of aluminum alloy, pipe, or the like.
The frame 2 functions to determine wheel alignment that affects stability, weight balance, maneuverability, and the like. Above the front part of the frame 2, a front fork 3 is supported so as to be steerable through an inclined head pipe,
A power system 5 such as an engine 4 and a fuel tank is held at a substantially central portion of the frame 2, and a swing arm 7 on which a rear wheel 6 can swing vertically is provided at a rear portion of the frame 2.
And a wheel 8.

A plurality of seat rails extending in the same direction extend obliquely above the rear portion of the frame 2, and a rotatable seat 9 is provided above the plurality of seat rails and a mud is provided below the seat rails. Rear fenders 10 are mounted respectively. The front fork 3 has a handle 11 supported on its upper part, a mudguard front fender 12 attached to the lower part, and a front wheel 13 elastically mounted on a lower outer tube via a wheel 14. Is supported.

As shown in FIG. 1, the multi-stage transmission 15 has a substantially cylindrical gear shift cam 16, which is rotatably supported by the engine case 4a via a bearing 17. A plurality of cam grooves are formed in the gear shift cam 16, and a gear shifter fitted to the transmission gear is inserted into the plurality of cam grooves. The gear shift cam 16 having such a configuration functions to rotate at a predetermined angle by a change lever, selectively slide a gear shifter, disengage a transmission gear, and perform a gear shift. The gear shift cam 16 rotates in the forward direction to sequentially increase the speed, and rotates in the reverse direction to sequentially reduce the speed.

The shift position detecting circuit 18A has a GPS 19
A, energizing contact 20, grounding contact 21,
And a control unit 22. The circuit is configured as shown in FIG. 3, and the engine case 4a is grounded via an engine ground 23. GPS19
A is formed in a plate shape of a substantially elliptical flat surface using an insulating material, is mounted on the engine case 4a via a coupling, and covers the end face of the gear shift cam 16 in an opposed state.

As shown in FIG. 1, a rectangular recess 24 is formed in the center of the surface of the GPS 19A, and a printed board 25 is mounted in the recess 24. A plurality of resistors R1, R2, R3, R4, R5 corresponding to the plurality of transmission gears are mounted at predetermined intervals. A plurality of resistors R1, R2,
R3, R4, and R5 have first and second speed contacts 26, each having a different resistance value and a substantially circular cross section.
a, a third speed contact 26b, a fourth speed contact 26c, and a fifth speed contact 26d.

A plurality of contacts 26, 26a, 26b, 26
Reference numerals c and 26d are made of a material such as copper, and are buried in the GPS 19A while being arranged in a substantially semicircular shape at predetermined intervals, and face the end face of the gear shift cam 16. It should be noted that a neutral contact 27 having a substantially circular cross section is provided with a plurality of contacts 26, 26a, 26b,
This neutral contact 27 is buried together with 26c and 26d, and is connected to the power source B via a neutral lamp 28.

The current-carrying contact 20 is formed in a pin shape with a rounded tip, is fitted in a mounting hole 29 on the end face of the gear shift cam 16 via a coil spring 30 so as to be able to move forward and backward, and faces the rear face of the GPS 19A. I have. The mounting hole 29 is formed in the end face of the gear shift cam 16 at a position shifted radially outward from the center of the end face of the gear shift cam 16 so as to extend in the axial direction. Therefore, the current-carrying contact 20 is turned into a plurality of contacts 26, 26a, 26b,
One of the contact points 26c and 26d and the neutral contact 27 is elastically urged and pressed.

The ground contact 21 is formed in a pin shape with a rounded tip, and is fitted into a fitting hole 31 of the GPS 19A via a coil spring 32 so as to be able to advance and retreat.
The gear shift cam 16 is elastically pressed against the center of the end face. The fitting hole 31 is provided in the center of the GPS 19A toward the center line, and is connected to the ground of the control unit 22 via a lead wire. Further, the control unit 22 includes an A / D converter 33 of an internal circuit of an igniter (not shown) and a pull-up resistor 34, and is connected to a plurality of resistors R1, R2, R3, R4, and R5.

In the above configuration, when the gear position is detected and the gear shift cam 16 is rotated at a predetermined angle to perform the gear shift, the contact 2 corresponding to the gear shift is detected.
6, 26a, 26b, 26c, 26d (one of them) is contacted with the energizing contact 20, a signal is output to the A / D converter 33, and the signal is processed. At this time, since the resistance value differs depending on the gear position, the voltage of the A / D converter 33 changes, and the change in which gear of the multi-stage transmission 15 is used, in other words, the gear position Is detected. This detection is appropriately used when the maximum rotation speed of the engine 4 is controlled based on the gear position, or when the ignition time is changed to change the output characteristics of the engine 4 to improve drivability.

When the gear position is detected, the engine case 4
a and the gear shift cam 16 may have a large contact resistance. However, according to the present embodiment, the ground is taken directly from the gear shift cam 16 and the gear shift cam 16
Since the ground itself is always at the ground potential, there is no need to expect the ground path from the engine case 4a, and there is no need to pay attention to the magnitude of the contact resistance. Therefore, the input voltage of the A / D converter 33 becomes unstable due to the increase in the contact resistance,
The possibility of erroneously detecting the detection of the gear position can be removed very effectively.

FIG. 5 shows a second embodiment of the present invention. In this case, a fitting hole 31A is formed in the center of the end face of the gear shift cam 16 in the axial direction.
The ground contact 21 is fitted into the fitting hole 31A via the coil spring 32 so as to be able to move forward and backward, and the GPS 19A
A center contact 35 pressed into contact with the ground contact 21 is buried in the center portion in the axial direction, and this center contact 35 is connected to the ground of the control unit 22 via a lead wire. The other parts are the same as those in the above-described embodiment, and the description is omitted.

In this embodiment, the same operation and effect as those of the above embodiment can be expected. In addition, the ground contact 21 is always in contact with the center of the GPS 19A via the center contact 35, and the gear shift cam 16 itself is always set to the ground potential. Therefore, the following effects can be expected. That is, G
When the ground contact 21 is brought into contact with the non-center portion of the PS 19A, the operating area of the ground contact 21 is widened, so that the center contact 35 must be configured to have a fan-shaped cross section or a semi-circular shape to increase the size. In addition, when the center contact 35 becomes large, there is a possibility that casting failure of the GPS 19A may be caused.

According to this embodiment, the operating area of the ground contact 21 can be reduced, whereby the center contact 35 can be remarkably reduced in size, and the possibility of poor casting can be eliminated very effectively. Can be. Further, it is possible to greatly reduce the cost, and it is expected that the common use of the parts with the contacts 26 and 26a for the first speed, the second speed and the like can be expected.

Although the motorcycle 1 is merely shown in the above embodiment, the invention can be widely applied to various vehicles such as an on-road type and an off-road type. Further, the gear shift cam 16, the GPS 19A, the printed circuit board 25, the resistors R1, R2, R3, R4, R5, the contacts 26, 26a, 2
The shape, structure, number, etc. of 6b, 26c, 26d, the energizing contact 20, or the grounding contact 21 can be appropriately increased or decreased. For example, the engine case 4a and the gear shift cam 16 may be of a non-contact type.

The GPS 19A has a resistor R1,
There are a type provided with R2, R3, R4, and R5 and a type provided with external resistors R1, R2, R3, R4, and R5, but any type may be used. In addition, other types of passive elements and active elements can be used as appropriate instead of the resistors. The center axis of the ground contact 21 (ground contact) is connected to the gear shift cam 16 (gear shift member).
May be provided at a position slightly deviated from the center.
In this way, by sliding to some extent between the contacts, the oxide film on the surface is removed, and poor contact can be prevented very effectively. Furthermore, in the above-described embodiment, the ground contact 21 is attached to the fitting hole 31 at the center of the GPS 19A or the fitting hole 31A at the center of the end face of the gear shift cam 16, but it is not necessarily the complete center. Alternatively, it can be attached as long as it is within a range recognized as a center.

[0027]

As described above, according to the first aspect of the present invention, the gear position can be detected without error irrespective of the magnitude of the contact resistance between the engine and the gearshift member.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view showing an embodiment of a shift position detecting device for a multi-speed transmission according to the present invention.

FIG. 2 is an explanatory view showing a gear position switch of FIG. 1;

FIG. 3 is a circuit diagram of FIG. 1;

FIG. 4 is an overall explanatory diagram showing a motorcycle equipped with a shift position detecting device for a multi-stage transmission according to the present invention.

FIG. 5 is an explanatory sectional view showing another embodiment of the shift position detecting device of the multi-stage transmission according to the present invention.

FIG. 6 is an explanatory sectional view showing a conventional shift position detecting device for a multi-stage transmission.

FIG. 7 is an explanatory view showing the gear position switch of FIG. 6;

FIG. 8 is a circuit diagram showing a conventional shift position detecting device for a multi-stage transmission.

[Explanation of symbols]

 Reference Signs List 1 motorcycle 4 engine 4a engine case 15 multi-stage transmission 16 gear shift cam 17 bearing 18 shift position detection circuit 18A shift position detection circuit (shift position detection means) 19A GPS 20 energizing contact (second contact element) 21 ground contact 22 Control unit 23 Engine ground 26 Contact (first contact element) 26a Contact (first contact element) 26b Contact (first contact element) 26c Contact (first contact element) 26d Contact (first contact element) 27 Contact for neutral 29 Mounting hole 30 Coil spring 31 Fitting hole 31A Fitting hole 32 Coil spring 33 A / D converter R1 resistance R2 resistance R3 resistance R4 resistance R5 resistance

Claims (1)

[Claims] 1. A multi-stage transmission for switching a transmission gear by rotating a gear shift member at a predetermined angle, and a shift position detection unit for detecting a shift position of the multi-stage transmission. The shift position detecting means includes a plurality of first contacts that are substantially semi-circularly opposed to a non-center portion of an end face of the gear shift member corresponding to a plurality of shift gears of the multi-stage transmission. An element, a second contact element provided at a non-central part of an end face of the gear shift member, the second contact element being in contact with any one of the plurality of first contact elements by rotation of the gear shift member, and a shaft including a central part of the gear shift member. A shift contact detection device for a multi-stage transmission, comprising: a ground contact provided on a line for setting the gear shift member to a ground potential.