JP2007137376A - Change device for motorcycle or the like - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small size and compact change device with less number of parts and a simple constitution and to accomplish the optimum drive control. <P>SOLUTION: A pin 21 is projectedly provided on an outer surface of a nut 15 thread-engaged with a screw shaft 14 of a ball screw 13 driven by a motor 12 through a ball and is inserted to a guide hole 22 formed on a distal end of a shift lever 7. A link 25 is fixed to the rotation shaft 24 and the pin 21 is inserted to a long hole 26 formed on the link 25. The screw shaft 14 is rotated by the motor 12, the shift lever 7 is pivoted by axial movement of the nut 15 and shift change is performed by turning of a shift operation shaft 6. Further, the link 25 is pivoted by axial movement of the pin 21 provided on the nut 15 and a rotation angle of the shift operation shaft 6 is detected. Reduction of shock at the shift change is accomplished by controlling a rotation angle and a rotation speed of the motor 12 based on the detection signal. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a change device such as a motorcycle, a three-wheeled vehicle, or a four-wheeled buggy.

  In general, a motorcycle or the like has a change pedal, and a shift operation shaft is rotated by raising or lowering the change pedal so as to perform a shift change.

In the stepping type change device as described above, it is necessary to operate the change pedal every time a shift change is performed, so that the burden on the driver is large. In order to reduce the burden and improve comfort, in Patent Document 1, a reciprocating motor is driven by the operation of a hand switch, and the cam plate is swung by the rotation of the motor. A change device is proposed in which an intermediate lever fixed to an operation shaft is swung to rotate a speed change operation shaft.
JP-A-8-93915

  By the way, the above change device can be incorporated into a conventional stepping type change device and can be changed by either foot operation or hand switch operation, but a bolt is attached to a mounting plate fixed to the transmission case. A support shaft is provided, and the cam plate is supported by the bolt support shaft in a swingable manner. Between the drum fixed to the cam plate and rotatable about the bolt support shaft and the drum rotated by a reciprocating motor. Further, since the number of parts over which two wires are routed is large, there is a problem that the cost is high and the assembly is troublesome.

  Further, since the change device becomes large, when it is intended to be applied to a motorcycle employing a clutch device described in Japanese Patent Application Laid-Open No. 2005-67450, it may be applied due to the size of the motorcycle. Have difficulty.

  When the shift change operation is automated, the driver feels uncomfortable if the driver feels a shock when shifting to the driver and the feeling of change timing is bad. In order to solve the problem, a sensor mechanism for detecting the rotation angle of the speed change operation shaft is very important in order to perform optimal drive control. However, in the change device described in Patent Document 1, Nothing is said about the point, leaving a problem.

  An object of the present invention is to provide a small and compact change device having a simple configuration with a small number of parts, and to enable optimum drive control.

  In order to solve the above-mentioned problems, in the present invention, in a change device such as a motorcycle that shift-changes by rotation of a speed change operation shaft, a shift lever fixed to an end of the speed change operation shaft, and the shift lever And a motor that drives the ball screw. The ball screw includes a screw shaft and a ball that can roll along a screw groove formed on an outer periphery of the screw shaft. A nut engaged with a screw shaft via, one of the screw shaft and the nut is connected to the motor and supported rotatably at a fixed position, and the other is supported axially movable. And a pin that protrudes on the outer peripheral side of the screw shaft or nut that is prevented from rotating and is movable in the axial direction, and that pin is inserted into a guide hole formed at the tip of the shift lever, Around the pin A rotation sensor for detecting the rotation angle of the speed change operation shaft is provided, and a conversion mechanism is provided between the rotation shaft of the rotation type sensor and the pin to convert linear motion in the axial direction of the pin into rotation motion of the rotation shaft. The configuration was adopted.

  Here, as a conversion mechanism, a link is fixed to the rotary shaft of the rotary sensor provided at a position facing the tip of the shift lever, and the pin is inserted into a long hole formed in the link extending in the length direction. What consists of composition can be adopted.

  In the change device having the above configuration, in the change device in which the screw shaft is connected to the motor, when the screw shaft is rotated by driving the motor, the nut moves in the axial direction, and the shift lever is moved by the axial movement of the nut. It swings, and the speed change operation shaft rotates and shift-changes.

  Further, the link is swung by the movement of the nut in the axial direction, and the rotation shaft of the rotary sensor rotates by an angle corresponding to the amount of movement of the nut to detect the rotation angle of the speed change operation shaft. For this reason, the detection signal output from the rotary sensor is input to the ECU, and based on the input signal, the rotational speed and rotation angle of the motor are controlled to reduce the shock of the shift change, and the timing of the shift change. It becomes possible to adjust, and the feeling to the driver can be improved.

  As described above, in the present invention, since the shift lever is swung by the ball screw driven by the motor to rotate the speed change operation shaft, the structure is simple and the number of parts is small. A small change device that does not secure a large space can be obtained.

  Further, since the ball screw has high accuracy and the shift lever fixed to the speed change operation shaft is swung by the ball screw, there is little play and high-precision control is possible.

  In addition, since the rotation angle of the speed change operation shaft is detected by the rotation type sensor, it is possible to control the rotation speed and rotation angle of the motor based on the detection signal of the rotation type sensor and reduce the shock of shift change. Or adjust the timing of shift changes.

  Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, an intake pipe 2 and an exhaust pipe 3 are connected to an engine 1 mounted on a motorcycle, and a carburetor 4 is incorporated in the intake pipe 2.

  A mission case 5 is provided below the engine 1. A transmission operation shaft 6 is rotatably supported on the transmission case 5, and a gear transmission (not shown) incorporated in the transmission case 5 is shift-changed by rotating the transmission operation shaft 6. .

  A shift lever 7 is fixed to a shaft end portion located outside the transmission operation shaft 6 from the transmission case 5, and when the shift lever 7 is pulled up, the gear transmission is shifted up and the shift lever 7 is pushed down. As a result, the gear transmission is shifted down.

  The shift lever 7 is swung by the driving device 10 shown in FIGS. The drive device 10 includes a housing 11 fixed to the mission case 5, and a DC motor 12 and a ball screw 13 driven by the DC motor 12 are supported on the housing 11.

  The ball screw 13 has a configuration in which a ball (not shown) is incorporated between a screw groove formed on the outer periphery of the screw shaft 14 and a screw groove provided on the inner periphery of the nut 15. 11 is rotatably supported by a bearing 16 incorporated in the motor 11.

  Further, the screw shaft 14 is connected to the rotating shaft of the DC motor 12 via the coupling 17, and the screw shaft 14 is rotationally driven by the DC motor 12. On the other hand, the DC motor 12 is controlled by the ECU 18.

  Here, the ECU 18 controls the DC motor 12 based on a signal input from the shift change hand switch 19.

  The nut 15 is slidable along the guide hole 20 formed in the housing 11 and is prevented from rotating.

  A pin 21 is provided on the outer surface of the nut 17, and the pin 21 is inserted into a guide hole 22 formed at the tip of the shift lever 7.

  A rotation type sensor 23 is provided around the pin 21 so as to face the tip of the shift lever 7. As the rotary sensor, a shaft encoder using a magnetic type (Hall IC), an optical type, a potentiometer or the like can be used. One end of a link 25 is fixed to the rotary shaft 24 of the rotary sensor 23, and the pin 21 provided on the nut 15 is provided in a long hole 26 formed in the other end of the link 25 extending in the length direction. It is slidably inserted.

  The rotation shaft 24 of the rotary sensor 23 rotates by an angle corresponding to the amount of movement of the pin 21 in the axial direction, and detects the rotation angle of the speed change operation shaft 6 from the rotation angle.

  The change device shown in the embodiment has the above-described structure. Now, when the hand switch 19 is operated and a signal is input to the ECU 18, the DC motor 12 is driven and the screw shaft 14 is rotated. As the screw shaft 14 rotates, the nut 15 moves in the axial direction of the screw shaft 14, and the shift lever 7 swings, and the speed change operation shaft 6 rotates and shift-changes.

  Further, the movement of the nut 15 in the axial direction causes the link 25 to swing, and the swing of the link 25 causes the rotation shaft 24 of the rotary sensor 23 to rotate. The rotational sensor 23 rotates the rotation angle of the speed change operation shaft 6. Is detected.

  For this reason, the detection signal output from the rotary sensor 23 is input to the ECU 18, and the rotational speed and the rotation angle of the motor 12 are controlled based on the input signal, thereby reducing the shock at the time of shift change, The timing of the change can be adjusted, and the feeling to the driver can be improved.

  As described above, since the shift change can be performed by operating the hand switch 19, it is possible to reduce the load on the driver as compared with the step-type change device.

  Further, since the shift lever 7 is swung via the ball screw 13 driven by the DC motor 12 and the shift operation shaft 6 is rotated by the shift lever 7, the number of parts is simple, so the cost is low. Moreover, since it is small and compact, it is not necessary to secure a large space for assembly.

  Further, since the ball screw 13 has a high accuracy and is configured such that the nut 15 of the ball screw 13 and the shift lever 7 fixed to the speed change operation shaft 6 are connected, there is little play, and the screw shaft 14 of the ball screw 13 has a small play. The shift lever 7 can be swung by an angle corresponding to the amount of rotation, and high-precision control can be achieved.

  In the embodiment, the screw shaft 14 is rotated by the DC motor 12 and the nut 15 is moved in the axial direction. However, the nut is rotated at a fixed position by the DC motor 12, and the nut is screwed via a ball. The screw shafts to be combined may be moved in the axial direction. In this case, a pin is projected from the outer periphery of the shaft end of the screw shaft, and the pin is inserted into a guide hole formed at the tip of the shift lever.

  Further, a pin is slidably inserted into a long hole 26 formed in the link 25, and the rotary sensor is operated by the axial movement of the screw shaft.

The front view of the state which assembled the change device concerning this invention to the engine of a motorcycle (I) is a longitudinal front view of the change device, (II) is a partially cutaway side view of (I)

Explanation of symbols

6 Shifting operation shaft 7 Shift lever 12 Motor 13 Ball screw 14 Screw shaft 15 Nut 21 Pin 23 Rotating sensor 24 Rotating shaft 25 Link 26 Slot

Claims (2)

In a change device such as a motorcycle that shifts and changes by rotation of a speed change operation shaft,
The shift lever includes a shift lever fixed to an end portion of the speed change operation shaft, a ball screw for swinging the shift lever, and a motor for driving the ball screw. The ball screw includes a screw shaft and a screw. A nut that engages with the screw shaft via a ball that can roll along a thread groove formed on the outer periphery of the shaft, and one of the screw shaft and the nut is connected to the motor to be in place. The other end of the screw shaft or nut is supported by the outer periphery of the screw shaft or nut that is prevented from rotating and is movable in the axial direction. A pin is inserted into a guide hole formed at the tip of the shift lever, and a rotation type sensor is provided around the pin to detect the rotation angle of the speed change operation shaft. In between, rotate the pin's axial linear motion Changing device for a motorcycle or the like which characterized in that a conversion mechanism for converting the rotary motion of the shaft.   The conversion mechanism has a configuration in which a link is fixed to a rotation shaft of a rotary sensor provided at a position facing the tip of the shift lever, and the pin is inserted into a long hole formed in the link extending in the length direction. A change device for a motorcycle or the like according to claim 1.

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