JP2832632B2 - Transmission in motorcycle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention (1) Field of Industrial Application The present invention relates to a transmission for a motorcycle.

(2) Conventional Technology Conventionally, in a motorcycle, a shift operation of a transmission is generally performed by rotating a shift pedal with a clutch disengaged during a gear shift.
In a motorcycle for racing, it is desired to perform a quick shift operation. On the other hand, when a clutch operation is required as described above, it is difficult to perform the shift operation quickly enough to satisfy the shift operation. . For this reason, in order to make it possible to shift the gear transmission according to the operation of the shift pedal without disengaging the clutch, the shift operation by the shift pedal is detected by a switch, and the engine output is temporarily changed according to the shift operation. A transmission that can change the speed is known in Japanese Utility Model Laid-Open No. 60-98735 and the like.

(3) Problems to be Solved by the Invention By the way, in a motorcycle, a shift-up operation direction in which a gear train of a plurality of gears provided in a gear transmission is established stepwise toward a higher gear, and each of the gear trains is An occupant operates the shift pedal with his / her foot to perform a shift operation in a shift-down operation direction opposite to the shift-up operation direction for gradually establishing a lower shift speed side. Since the operation is repeated with the foot, the occupant tends to forget which gear stage the currently established gear train belongs to. In addition, the shift pedal can be operated unnecessarily in the same shift-up operation direction as the shift-up operation in the state where the gear train for the highest gear is established,
It is possible to uselessly operate in the same downshift operation direction as when downshifting in the established state of the lowest gear stage gear train. Therefore, the shift pedal may be incorrectly operated in the upshift operation direction when the highest gear train is established, or the shift pedal may be incorrectly operated in the downshift operation direction when the lowest gear train is established. Easily, at the time of such an erroneous operation, the engine output control is executed in accordance with the shift operation of the shift pedal in the one disclosed in Japanese Utility Model Laid-Open No. 60-98735, and the engine output changes undesirably. .

The present invention has been made in view of such circumstances,
It is an object of the present invention to provide a transmission in a motorcycle that prohibits unnecessary engine output control when a shift operation is erroneously performed on a side where a shift operation by a transmission is impossible.

B. Configuration of the Invention (1) Means for Solving the Problems The device of the present invention for achieving the above object includes a gear transmission capable of selectively establishing a gear train of a plurality of shift speeds; The shift-up operation direction at the time of upshifting to establish the gear train on the gear stage side in a stepwise manner is opposite to the shift-up operation direction at the time of downshifting to establish the gear train at a lower gear stage in a stepwise manner. It is possible for the occupant to operate the foot by switching the shift-down operation direction, and unnecessary operation in the same shift-up operation direction as at the time of the shift-up operation in a state where the gear train for the highest gear is established;
And a shift pedal capable of performing unnecessary operation in the same downshift operation direction as the downshift operation in the state where the lowest gear stage gear train is established; and in order to eliminate the need for clutch operation when shifting the shift pedal. An output control means capable of controlling the output of the engine; a shift position detection sensor for detecting a gear train established in the gear transmission; and a shift-up operation direction and a shift-down operation of the shift pedal. A shift operation sensor for detecting a shift operation of the shift pedal by distinguishing an operation in a direction; and a shift-up operation direction of the shift pedal in a state in which a gear train for the highest gear is detected by the shift position detection sensor. Shift down of the shift pedal in a state where the unnecessary operation of the gear and the gear train for the lowest gear are detected. The output of the engine is temporarily changed in response to the shift operation sensor detecting a shift operation except when the shift operation sensor detects an unnecessary operation in the working direction by the shift operation sensor. A control unit for controlling the output control means so as not to change the output of the engine in spite of the shift operation detected by the shift operation sensor.

(2) Operation According to the above configuration, when the shift pedal is operated unnecessarily in the shift-up operation direction in the state where the gear train for the highest gear stage is established in the gear transmission, and the gear train for the lowest gear stage is established. When the shift pedal is operated in the downshift operation direction unnecessarily in this state, the engine output is not limited, and the engine output is not reduced while enabling the quick shift operation without the clutch operation. Desired changes can be prevented.

(3) Example An example in which the present invention is applied to a motorcycle for racing will be described below with reference to the drawings.

First, in FIG. 1, a reed valve 3 is disposed in an intake pipe 2 of a two-cycle engine 1 mounted on a motorcycle, and a throttle valve 4 is disposed upstream of the reed valve 3. The valve 4 is provided with a throttle sensor S _TH for detecting the opening of the valve 4, that is, the throttle opening θ _TH . An ignition plug 6 is disposed on the engine body 1a facing the combustion chamber 5, and an ignition control device 7 as output control means for controlling the output of the engine 1 is connected to the ignition plug 6. Further to the crankshaft 8 of the engine 1 is connected is normally meshed gear transmission 10 via a transmission mechanism 9, the rotation speed sensor for detecting a rotational speed N _E of the engine 1
S _NE is disposed in association with crankshaft 8. Transmission 1
0, the shift device 13 including a shift pedal 12 for performing shift operation are connected, the load sensor S _M as a shift operation sensor for detecting a shift operation in the shift device 13 detects the shift load M It is arranged to be.

In FIG. 2, the gear transmission 10 is configured, for example, for six-speed shifting. A transmission case 15 of the transmission 10 includes a main shaft 16 connected to the crankshaft 8 via a transmission mechanism 9, a counter shaft 17 connected to rear wheels via a chain drive mechanism (not shown), and a shift drum. 18 are rotatably supported around the axis in parallel with each other, and a shifter guide shaft 19 is fixedly disposed in parallel with these 16, 17, 18 so that the main shaft 16 and the counter shaft 17 The first gear stage gear train 20 ₁ , the second gear stage gear train 20 ₂ , the third gear stage gear train 20 ₃ , the fourth gear stage gear train 20 ₄ , the fifth gear stage Step gear train 20
₅ as well as the gear train 20 ₆ for the highest gear, ie the sixth gear
Is interposed. The shift gear 2 is attached to the shifter guide shaft 19.
Shifters 24, 25, and 26 individually engaged with 1, 22, and 23 are slidably fitted in the axial direction, and guide pins 24a, 25a, and 26a implanted in these shifters 24-26 respectively shift. The drum 18 is relatively movably engaged with lead grooves 27, 28, 29 provided on the outer periphery of the drum 18. Thus, the shift drum 18 is
By being brought intermittently turnable operation by a predetermined shift angle by the shifter 24 to 26 are selectively slidably driven, said one of the gears 20 ₁ to 20 ₆ is established selectively by it .

In such gear transmission 10, the shift in order to detect the stage gear train 20 ₁ to 20 _6, for example the shift drum 18 shift position detecting sensor S _G is the transmission case and to detect the rotational position in established state Arranged at 15.

Referring again to FIG. 1, the shift device 13 includes a shift pedal.
The gear is shifted up by depressing 12 in the direction indicated by arrow 30, and is shifted down by rotating in the direction opposite to arrow 30, and a footrest 12a is provided at one end.
A shift pedal 12 which is formed in a substantially L-shape while having a bent portion supported on the body of the motorcycle via a shaft 31, and a shift shaft 32 which is supported by the transmission case 15.
A pivot arm 33 having a base end is fixed to, and a link 34 for connecting the shift pedal 12 and the pivot arm 33, a load sensor S _M to the intermediate portion of the link 34 is interposed. Thus, the shift shaft 32 and the shift drum 18 are connected via a conventionally known interlocking and connecting mechanism 35, and a shift pedal
The shift drum 18 is intermittently driven to rotate by the interlocking operation and the operation of the connecting mechanism 35 according to the operation of 12.

However, by acting the tensile load on the load sensor S _M during up-shifting operation by the shift pedal 12, the load sensor S _M be an electric signal corresponding to the tensile load as the shift load M during upshifting become. The load sensor S _M at the time of down-shifting operation will output an electric signal corresponding to the compressive load as a shift load during downshifting.

Incidentally, the shift position detected by the shift position detecting sensor S _G G _P, the shift load M to be detected by the load sensor S _M, the throttle opening theta _TH detected by the throttle sensor S _TH,
And the engine speed N detected by the speed sensor S _NE
E is input to a control unit 36 composed of a microcomputer. Thus to control unit 36, a shift position G _P, shift load M, in response to the shift operation by the shift pedal 12 based on the throttle opening theta _TH and the engine speed N _E, the transmission 10 without cutting the clutch The ignition control device 7 is controlled so as to enable the shift operation.

That control unit 36 determines that the shift load M to be detected by the load sensor S _M is shifted up Operation has been performed when it becomes equal to or higher than a predetermined value M _TH as shown in FIG. 3 at the time of shift-up operation, the 4 as shown in the figure, determines the ignition timing correction value [Delta] [theta] _ig to control the ignition timing by the ignition control device 7 so as to reduce the output of the engine 1 according to the engine speed N _E and the throttle opening theta _TH, the The output reduction control of the engine 1 is performed by correcting the ignition timing to, for example, the retard side by the ignition timing correction value Δθ _TH . As a result, the output of the engine 1 is reduced,
And temporarily unloaded condition the gear train during operation of the gear train 20 ₁ to 20 _6, while the rotation and the selected shifter 24 to the shift drum 18 by lowering the meshing friction gear train 26
The shift-up operation can be performed by smoothing the movement of the vehicle. Moreover, during this time, the throttle valve 4 is kept open, and the upshift can be performed without the clutch operation. When the downshift operation is performed while returning the throttle valve 4 to the closed side, the output of the engine 1 is controlled to be temporarily increased while the throttle opening θ _TH is kept at or near the fully closed position. can be in the transmission 10 reduces the load acting on the gear train during operation of the gear train 20 ₁ to 20 _6, perform rapid downshift operation while eliminating the need for clutch operation.

By the way, the control unit 36 includes a gear train for the highest gear.
20 ₆ upshift in a state being established, as well as procedures for prohibiting downshifting of a state where a minimum gear shift stage gear train 20 ₁ is established is set as shown in FIG. 5 The processing according to the flowchart shown in FIG. 5 is executed by the control unit 36.

In the first step S1, it is determined whether or not a shift operation has been performed, and if it is determined that the shift operation has been performed, the second
Proceed to step S2. In the second step S2, whether the highest gear-change gear 20 ₆ is established by the shift position detecting sensor S _G is the up-shifting operation in a state that is detected is determined, and if not, Proceed to the third step S3. Whether downshifting scanning in a state where it is detected that the lowest gear-change gear train 20 ₁ is established by the third step S3 shift position detecting sensor S _G is determined, the otherwise fourth Proceeding to step S4, in this fourth step S4, a power shift by output control of the engine 1 is executed.

Next, to explain the action of this embodiment, in response to exceeding the predetermined value shift load M detected by the load sensor S _M in response to the shift operation by the shift pedal 12, the control unit 36 outputs control of the engine 1 Is started, whereby the shift operation in the transmission 10 is started.

Thus and output control of the maximum gear-change gear train 20 ₆ incorrectly in a state in which is established the engine 1 be subjected to shift-up operation is not performed and also to establish a minimum gear shift stage gear train 20 ₁ The output control of the engine 1 is not executed even if the shift down operation is performed by mistake while the vehicle is in the state. Therefore the transmission
Even if the shift operation is performed by mistake on the side where the shift operation is not possible in 10, the output control of the engine 1 will not be undesirably executed.

In the above embodiment, the output of the engine 1 is controlled by correcting the ignition timing at the time of shifting, but the output of the engine 1 is controlled to be increased or decreased by controlling the air-fuel mixture, controlling the air-fuel ratio, and controlling the exhaust timing. It may be.

C. Effects of the Invention As described above, according to the present invention, useless operation of the shift pedal in the shift-up operation direction in the gear transmission in a state where the gear train for the highest gear is established, and the lowest gear Even if an unnecessary operation of the shift pedal in the downshift operation direction is mistakenly performed while the gear train is established, the engine output control will not be executed and the clutch operation will not be required, and a quick shift will be unnecessary. While enabling operation,
It is possible to prevent the engine output from changing undesirably.

[Brief description of the drawings]

1 shows an embodiment of the present invention, FIG. 1 is an overall configuration diagram, FIG. 2 is a longitudinal sectional view of a transmission, FIG. 3 shows a change in shift load, and FIG. FIG. 3 is a diagram showing the control timing of the ignition timing corresponding to the change of the shift load in FIG.
FIG. 5 is a flowchart showing a processing procedure for prohibiting engine output control. 1 ... Engine 7 ... Ignition control device as output control means 12 ... Shift pedal 20 ₁ ... Lowest gear stage gear train, 20 _{2 to} 20 ₅ ... Gear train, 20 ₆ ... Highest gear shift Gear train for step, 36 ... Control unit, S _G ... Shift position detection sensor, S _M ... Load sensor as shift operation sensor

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A-61-171838 (JP, A) JP-A-60-98734 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F02D 29/00-29/06 B60K 41/00-41/28

Claims (1)

(57) [Claims] Said gear train (20 ₁ to 20 of the higher gear stage side; 1. A plurality gear of the gear train (20 ₁ to 20 ₆₎ alternatively possible establishment and the gear transmission (10) and up-shifting operation direction during upshift to establish ₆₎ stepwise, and said the up-shifting operation direction during the shift down a gear train (20 ₁ to 20 ₆₎ established stepwise in lower gear position switching the reverse shift down operation direction together with the occupant can be operated by foot, the highest gear stage gear train (20 ₆₎ in the established state of the the shift-up during the same shift-up operation direction unnecessary operation, and minimum and gear-change gear train (20 ₁₎ of the useless operation is allowed shift pedal to the down-shifting the same shift down operation direction in the established state (12); the shift pedal The clutch operation is not performed during the shift operation of (12). Main control output control means an output of the engine (1) in order to (7); in a motorcycle equipped with the gear train in the established state by gear transmission (10) and (20 ₁ to 20 ₆₎ A shift position detecting sensor (S _G ) for detecting a shift operation sensor (S _G ) for detecting a shift operation of the shift pedal (12) by distinguishing an operation of the shift pedal (12) in a shift-up operation direction and a shift-down operation direction. S _M) and; unnecessary operation to the shift-up operation direction of said shift pedal by the shift position detecting sensor (S _G) in a state that detects the highest gear position gear train (20 ₆₎ (12) and wherein except when shifting erroneous operation unnecessary operation to shift down operation direction of the shift pedal (12) detected by the shift operation sensor (S _M) in a state that detects at least gear-change gear train (20 ₁₎ Before The output of the engine (1) is temporarily changed according to the shift operation sensor (S _M ) detecting the shift operation.
At the time of the erroneous shift operation, the engine (1) despite the shift operation detection by the shift operation sensor (S _M ).
A control unit (36) for controlling the output control means (7) without changing the output of the transmission.